CN114424430A - Armature core, armature, and motor - Google Patents

Abstract

The armature core, that is, the stator core (5) has a plurality of split cores (11) each of which is a laminate of a plurality of core pieces. Each of the plurality of split cores (11) has a yoke (12) and a tooth (13) protruding from the yoke (12) in a second direction perpendicular to the first direction. A first groove portion (16a) and a second groove portion (16b) each recessed in the second direction are provided on the outer peripheral surface (15), which is a second surface opposite to the first surface of the yoke portion (12) . The laminated body includes a first part constituting the first groove part (16a), a second part constituting the second groove part (16b), and a third part provided between the first part and the second part in the first direction. The third portion includes a surface constituting an end in the first direction of the first groove portion (16a) and a surface constituting an end in the first direction of the second groove portion (16b).

Description

Armature core, armature and motor

technical field

The present invention relates to an armature core having a plurality of split cores, an armature and a motor.

Background technique

Conventionally, an armature core configured by connecting a plurality of split cores in a ring shape is known. Each split core is constituted by laminating a plurality of core pieces that are electromagnetic steel sheets. The split core has a yoke part through which the magnetic flux passes and a tooth part protruding from the yoke part. In the tooth portion, after installing the insulator, the wire is wound to form a coil.

The winding of the wire rod is performed in a state in which the divided iron core, which is the object of winding, is held by the jig. In order to accurately wind the wire rod around the split core, it is required that the split core can be accurately positioned and the split core can be stably held with respect to the tension applied to the wire rod.

Patent Document 1 discloses that, in an armature core having a plurality of divided cores connected in a ring shape, grooves are provided on the outer peripheral surfaces of the divided cores. The outer peripheral surface of the split core is a surface facing the opposite side to the protruding side of the tooth portion among the yoke portions. The groove portion is formed so as to extend in the lamination direction at the center portion in the circumferential direction of the yoke portion. The groove portion functions as a reference for positioning when winding the wire rod. The jig is provided with a fitting portion that can be fitted into the groove portion. In a state in which the split iron core is held by the jig, the fitting portion is fitted into the groove portion, whereby accurate positioning of the split iron core can be performed, and the split iron core can be held stably. Since the wire rod can be accurately wound around the split core, the occurrence of defects in the winding of the wire rod can be reduced, and the armature can be manufactured with high productivity.

Patent Document 1: Japanese Patent Laid-Open No. 2005-110464

SUMMARY OF THE INVENTION

The volume of the yoke portion provided with the groove portion is smaller than the volume of the yoke portion in which the groove portion is not provided. As the volume of the yoke portion decreases, the magnetic flux that can pass through the yoke portion decreases, thereby reducing the torque that can be output from the motor having the armature core. In this case, even if the electric motor increases the current flowing to the electric motor, the torque that can be output cannot be increased, and high electrical characteristics cannot be obtained. Therefore, it is desirable to suppress the volume reduction of the yoke portion as much as possible.

In the case of the prior art disclosed in Patent Document 1, the groove portion is formed entirely in the lamination direction in the yoke portion, whereby the volume of the yoke portion is greatly reduced. Further, even if an attempt is made to increase the volume of the yoke portion by reducing the width of the groove portion in the circumferential direction, the smaller the width of the groove portion becomes, the more difficult it becomes to stably hold the split core in the jig. In addition, as the width of the groove portion in the circumferential direction becomes smaller, the fitting portion becomes more difficult to fit into the groove portion, so that the work efficiency when attaching the split core to the jig becomes worse. Furthermore, as the width of the groove portion becomes smaller, the manufacture of the core piece becomes more difficult. Therefore, it is difficult to increase the volume of the yoke portion by reducing the width of the groove portion in the circumferential direction. As described above, according to the prior art, there is a problem that the armature can be manufactured with high productivity, and on the other hand, it becomes difficult to achieve high electrical characteristics by reducing the volume of the yoke portion.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to obtain an armature core capable of producing an armature with high productivity and realizing high electrical characteristics in a motor having an armature.

In order to solve the above-mentioned problems and achieve the object, the armature core according to the present invention includes a plurality of split cores each of which is a laminate of a plurality of core pieces, and connects the plurality of split cores to each other. Each of the plurality of split cores has a yoke portion and a tooth portion protruding from the yoke portion in a second direction perpendicular to the first direction, which is a direction in which the plurality of core pieces are stacked. A first groove portion and a second groove portion each recessed in the second direction are provided on the second surface of the yoke portion on the opposite side to the first surface on which the tooth portion is provided. The laminated body includes a first portion constituting the first groove portion, a second portion constituting the second groove portion, and a third portion provided between the first portion and the second portion in the first direction. The third portion includes a surface constituting an end in the first direction of the first groove portion and a surface constituting an end in the first direction of the second groove portion.

effect of invention

The armature core according to the present invention has the effects that the armature can be manufactured with high productivity and high electrical characteristics can be realized in a motor including the armature.

Description of drawings

FIG. 1 is a cross-sectional view of a motor including a stator according to Embodiment 1 of the present invention.

2 is a perspective view of a stator core constituting the stator according to Embodiment 1. FIG.

FIG. 3 is a view showing a cross section of the stator core taken along the line III-III shown in FIG. 2 .

FIG. 4 is a diagram showing a cross section of the stator core at the line IV-IV shown in FIG. 2 .

FIG. 5 is a view showing a plan structure of the first to fifth core piece groups shown in FIGS. 3 and 4 .

FIG. 6 is a diagram showing the configuration of the transverse cross section of the first to fifth core piece groups shown in FIGS. 3 and 4 .

FIG. 7 is a diagram showing the configuration of the longitudinal section of the first to fifth core piece groups shown in FIGS. 3 and 4 .

FIG. 8 is a view showing a state in which a wire rod is wound around the split core constituting the stator core shown in FIG. 2 .

FIG. 9 is a diagram for explaining the winding of the wire rod to the split core shown in FIG. 8 .

FIG. 10 is a first view showing a state in which the split core shown in FIG. 8 is held by a holding mechanism.

FIG. 11 is a second view showing a state in which the split core shown in FIG. 8 is held by a holding mechanism.

FIG. 12 is a perspective view showing a jig constituting the holding mechanism shown in FIG. 11 .

FIG. 13 is a perspective view showing a state in which a core piece is fitted into the jig shown in FIG. 12 .

14 is a perspective view showing a stator core constituting the stator according to Embodiment 2 of the present invention.

FIG. 15 is a plan view of split cores constituting the stator core shown in FIG. 14 .

FIG. 16 is a diagram showing a transverse cross-section of the stator core shown in FIG. 14 .

FIG. 17 is a view showing a longitudinal section of the stator core shown in FIG. 14 .

FIG. 18 is a view showing the plan structure of the first to fifth core piece groups shown in FIGS. 16 and 17 .

FIG. 19 is a diagram showing the configuration of the longitudinal section of the first to fifth core piece groups shown in FIGS. 16 and 17 .

FIG. 20 is a diagram showing a state in which the split core shown in FIG. 14 is conveyed.

FIG. 21 is a view showing a state in which the wire rod is being wound on the split core shown in FIG. 14 .

FIG. 22 is an enlarged view of a portion including a third groove portion and a fitting portion in the structure shown in FIG. 21 .

Fig. 23 is a view showing a state in which the split core shown in Fig. 20 is held by a conveying mechanism.

24 is a cross-sectional view of a split core constituting a stator according to Embodiment 3 of the present invention.

25 is a diagram showing a first configuration example of the split core in Embodiment 3. FIG.

FIG. 26 is a view showing a state in which the split core shown in FIG. 25 is held by a holding mechanism.

FIG. 27 is a diagram showing a second configuration example of the split core in Embodiment 3. FIG.

FIG. 28 is a view showing a state in which the length in the first direction is adjusted with respect to the split core shown in FIG. 27 .

FIG. 29 is a view showing a state in which the adjusted split core shown in FIG. 28 is held by a holding mechanism.

30 is a view showing a split core according to a first comparative example of Embodiment 3. FIG.

FIG. 31 is a view showing a state in which the split core shown in FIG. 30 is held by a holding mechanism.

32 is a view showing a split core according to a second comparative example of Embodiment 3. FIG.

FIG. 33 is a view showing a state in which the split core shown in FIG. 32 is held by a holding mechanism.

34 is a view showing a split core according to a third comparative example of Embodiment 3. FIG.

FIG. 35 is a diagram showing a state in which the length in the first direction is adjusted with respect to the split core shown in FIG. 34 .

FIG. 36 is a view showing a state in which the adjusted split core shown in FIG. 35 is held by a holding mechanism.

37 is a cross-sectional view of a linear motor including an armature according to Embodiment 4 of the present invention.

Detailed ways

Hereinafter, the armature core, the armature, and the motor according to the embodiment of the present invention will be described in detail based on the drawings. In addition, this invention is not limited to this embodiment. In addition, in the drawings shown below, in order to make the drawings easier to see, hatching may be added in plan views, and hatching may not be added in cross-sectional views.

Embodiment 1.

FIG. 1 is a cross-sectional view of a motor including a stator according to Embodiment 1 of the present invention. The motor 1 that is an electric motor includes a stator 2 which is an armature; a rotor 3 which is a field element surrounded by the stator 2 and which is rotatably provided; and a frame 4 . A gap is provided between the stator 2 and the rotor 3 .

The stator 2 includes: a stator core 5, which is an armature core; an insulator 6, which insulates the stator core 5; and a coil 7, which generates a rotating magnetic field. The coil 7 is wound around the portion of the stator core 5 where the insulator 6 is provided. The rotor 3 has: a rotor core 8 which is a field element core; a shaft 9 which is provided at the center of the rotor core 8 ; and a plurality of permanent magnets 10 . The rotor 3 rotates around the axis C of the shaft 9 . The cross section shown in FIG. 1 is a cross section perpendicular to the axis C. As shown in FIG. In addition, in the following description, the direction of the axis C may be referred to as the axial direction, the direction along the circumference of the circle centered on the axis C may be referred to as the circumferential direction, and the direction of the diameter of the circle centered on the axis C may be referred to as the circumferential direction. is radial. The plurality of permanent magnets 10 are arranged in the circumferential direction.

The motor 1 has: a bearing which holds the shaft 9 rotatably; and a bracket which is fitted into the bearing. The frame 4 covers the periphery of the stator 2 and holds the rotor 3 via bearings and brackets. The illustration of the bearing and the bracket is omitted.

The stator core 5 has a plurality of split cores 11 connected to each other. The plurality of split cores 11 are arranged in the circumferential direction. Each of the plurality of split cores 11 is a laminate of a plurality of core pieces. Each of the plurality of core pieces is an electromagnetic steel sheet. The plurality of core pieces are stacked on each other in the axial direction, that is, in the first direction.

The split core 11 has a yoke portion 12 and a tooth portion 13 protruding from the yoke portion 12 . The tooth portion 13 protrudes from the yoke portion 12 toward the axis C in the radial direction. The end portion on the axis C side in the radial direction among the tooth portions 13 is wider in the circumferential direction than the portion other than the end portion among the tooth portions 13 . A space for arranging the coils 7 , that is, a slot is formed between the tooth portions 13 adjacent to each other in the circumferential direction. The insulator 6 covers the inner peripheral surface, which is the first surface of the yoke 12 on which the teeth 13 are provided, and the side faces in the circumferential direction among the teeth 13 .

The split cores 11 adjacent to each other in the circumferential direction are rotatably connected to each other by a connecting portion 14 provided at an end portion in the circumferential direction among the yoke portions 12 . The outer peripheral surface 15 of the split core 11 is the second surface of the yoke portion 12 on the opposite side to the inner peripheral surface on which the teeth portion 13 is provided. A groove portion 16 is provided on the outer peripheral surface 15 . The core pieces stacked on each other are fixed by the caulking portion 17 . The split core 11 is provided with caulking portions 17 at three locations. The number of the caulking portions 17 in the split core 11 and the positions where the caulking portions 17 are provided in the split core 11 can be appropriately changed.

2 is a perspective view of a stator core constituting the stator according to Embodiment 1. FIG. In FIG. 2, arrow D1 shows the above-mentioned 1st direction. The first direction is a direction in which a plurality of core pieces are stacked in each split core 11 . Arrow D2 indicates a second direction perpendicular to the first direction. Arrow D3 indicates a third direction perpendicular to the first direction and the second direction. The tooth portion 13 protrudes from the yoke portion 12 in the second direction.

When the stator core 5 is detached from the motor 1 , the stator core 5 can be deformed by the rotation of the split cores 11 in each connection portion 14 . FIG. 2 shows the stator core 5 in a linearly developed state.

As shown in FIG. 1 , when the stator core 5 is annular, the end face 18 of the split core 11 located at one end in the third direction among the plurality of split cores 11 constituting the stator core 5 and the plurality of split cores 11 The end face 19 of the split core 11 at the other end in the third direction is in contact with each other. From the state shown in FIG. 2 , the stator core 5 is deformed so that the end face 18 and the end face 19 come into contact with each other, whereby the stator core 5 becomes an annular shape.

Two groove portions 16 are provided on the outer peripheral surface 15 of each split core 11 . The first groove portion 16 a is a groove portion 16 provided on one end side of the outer peripheral surface 15 in the first direction. The second groove portion 16 b is a groove portion 16 provided on the other end side in the first direction among the outer peripheral surfaces 15 . Each of the first groove portion 16a and the second groove portion 16b is recessed in the second direction. In addition, in FIG. 2, the end provided with the 1st groove part 16a side of the split core 11 may be called a lower end, and the end provided with the 2nd groove part 16b side of the split core 11 may be called an upper end.

The 1st groove part 16a and the 2nd groove part 16b are provided in the center part in the 3rd direction among the outer peripheral surfaces 15. As shown in FIG. The groove part 16 is not provided in the center part in the 1st direction among the outer peripheral surfaces 15 . The 1st groove part 16a and the 2nd groove part 16b are arrange|positioned separately on the upper end side and the lower end side with the center part which is the part not provided with the groove part 16 interposed therebetween. As described above, the groove portion 16 is provided in the portion other than the center portion in the first direction of the outer peripheral surface 15 .

The split core 11, which is a laminated body of core pieces, has a first portion that constitutes the first groove portion 16a, a second portion that constitutes the second groove portion 16b, and a third portion that is provided in the first direction in the first direction. between part and part 2. The first part is a laminated body of the core pieces constituting the first groove portion 16 a among the plurality of core pieces constituting the split core 11 , and includes the lower end of the split core 11 . The second part is a laminate of the core pieces constituting the second groove portion 16 b among the plurality of core pieces constituting the split core 11 , and includes the upper end of the split core 11 . The third part is a laminated body of the core pieces other than the core pieces constituting the first groove portion 16a and the core pieces constituting the second groove portion 16b among the plurality of core pieces constituting the split core 11, and constitutes the above-mentioned central portion .

FIG. 3 is a view showing a cross section of the stator core taken along the line III-III shown in FIG. 2 . FIG. 4 is a diagram showing a cross section of the stator core at the line IV-IV shown in FIG. 2 . The cross section shown in FIG. 3 is a cross section parallel to the first direction and the third direction, and is a transverse cross section of the yoke portion 12 connected to each other. The cross section shown in FIG. 4 is a cross section parallel to the first direction and the second direction, and is a vertical cross section of the yoke portion 12 and the tooth portion 13 . In addition, in the following description, right and left shall be the right and left when the stator core 5 developed linearly as shown in FIG. 2 is viewed from the side of the teeth portion 13 . The end face 18 is the left end face of the stator core 5 , and the end face 19 is the right end face of the stator core 5 . FIG. 3 shows a cross section including a part of the end face 19 in the stator core 5 . The structure shown in FIGS. 3 and 4 is an example of the structure of the stator core 5 .

Here, the plurality of core pieces arranged in the third direction is referred to as a core piece group. The plurality of core piece groups constituting the stator core 5 includes first to fifth core piece groups 21 , 22 , 23 , 24 , and 25 . The first core piece 31 is a core piece constituting the first core piece group 21 . The second core piece 32 is a core piece constituting the second core piece group 22 . The third core piece 33 is a core piece constituting the third core piece group 23 . The fourth core piece 34 is a core piece constituting the fourth core piece group 24 . The fifth core piece 35 is a core piece constituting the fifth core piece group 25 . The first core piece 31 , the second core piece 32 , the third core piece 33 , the fourth core piece 34 , and the fifth core piece 35 have mutually different structures.

In the example shown in FIGS. 3 and 4 , the split core 11 is a laminate composed of 18 core pieces. The 18 core pieces include one first core piece 31 , six second core pieces 32 , five third core pieces 33 , three fourth core pieces 34 , and three fifth core pieces 35 .

A first core piece 31 is provided at the lower end of the split core 11 . On the 1st core piece 31, the 2nd core piece 32, the 3rd core piece 33, the 4th core piece 34, and the 5th core piece 35 are laminated|stacked in the order determined based on the structure of each core piece. A second core piece 32 is provided on the upper end of the split core 11 .

The first core piece 31 has the hole 26 . The second core piece 32 , the third core piece 33 , the fourth core piece 34 , and the fifth core piece 35 each have a boss 27 . The hole 26 and the boss 27 constitute the connecting portion 14 .

The protrusions 27 bulge the circular portion of the core piece. A circular recess is formed on the back surface side of the portion where the boss 27 is provided among the core pieces. The second core piece 32 , the third core piece 33 , the fourth core piece 34 , and the fifth core piece 35 are each stacked in a state in which the boss 27 faces downward. The hole 26 is circular, and is formed so that the boss 27 can be fitted. The bosses 27 provided on the second core pieces 32 stacked on the first core pieces 31 are fitted into the holes 26 . The boss 27 is rotatable in a state of being fitted into the hole 26 . Regarding the core pieces other than the first core piece 31, the bosses 27 provided on one core piece on the upper side among the two laminated core pieces are fitted into the other core piece on the lower side. the depression. The protrusions 27 are rotatable in a state of being fitted into the recesses.

In each core piece group, a gap 30 is provided between two adjacent core pieces. In the first core piece group 21 , the gap 30 provided between the two adjacent first core pieces 31 is located on the right side of the connection portion 14 . In the second core piece group 22 , the gap 30 provided between the two adjacent second core pieces 32 is located on the left side of the connection portion 14 . In the third core piece group 23 , the gap 30 provided between the two adjacent third core pieces 33 is located on the right side of the connection portion 14 . In the fourth core piece group 24 , the gap 30 provided between the two adjacent fourth core pieces 34 is located on the left side of the connection portion 14 . In the fifth core piece group 25 , the gap 30 provided between the two adjacent fifth core pieces 35 is located on the right side of the connection portion 14 . In the stator core 5 , the core piece groups provided with the gap 30 on the right side of the connection portion 14 and the core piece group with the gap 30 provided on the left side of the connection portion 14 are alternately stacked.

In the 1st core piece group 21, the hole 26 is provided in the 1st core piece 31 on the left side among two mutually adjacent 1st core piece 31. In the 2nd core piece group 22, the protrusion part 27 is provided in the 2nd core piece 32 on the right side among two mutually adjacent 2nd core piece 32. In the third core piece group 23 , the boss portion 27 is provided on the left third core piece 33 among the two adjacent third core pieces 33 . In the fourth core piece group 24 , the boss portion 27 is provided on the right fourth core piece 34 among the two adjacent fourth core pieces 34 . In the fifth core group 25, the fifth core piece 35 on the left among the two adjacent fifth core pieces 35 is provided.

The first core piece 31 has the hole 28 . The second core piece 32 , the third core piece 33 , the fourth core piece 34 , and the fifth core piece 35 each have a boss 29 . The hole 28 and the raised portion 29 constitute the rivet portion 17 .

The protrusions 29 bulge the rectangular portion of the core piece. A rectangular recess is formed on the back side of the portion where the boss 29 is provided among the core pieces. The second core piece 32 , the third core piece 33 , the fourth core piece 34 , and the fifth core piece 35 are each stacked in a state in which the boss portion 29 faces downward. The hole 28 is a rectangle into which the boss 29 can enter. The boss|hub part 29 provided in the 2nd core piece 32 laminated|stacked on the 1st core piece 31 is the state which entered the hole 28, and is fastened to the hole 28. Regarding the core pieces other than the first core piece 31 , the boss 29 provided on the upper one of the two core pieces stacked on each other is set to face the other core piece on the lower side. In the state in which the provided recess is entered, it is fastened to the recess.

As shown in FIG. 4, the 1st part 20a which comprises the 1st groove part 16a is a laminated body of five core pieces. In the first portion 20 a , the second core pieces 32 and the third core pieces 33 are alternately stacked on the first core pieces 31 . The second portion 20b constituting the second groove portion 16b is a laminate of seven core pieces. The second core pieces 32 and the third core pieces 33 are alternately stacked on the second portion 20b. The third portion 20c in which the groove portion 16 is not provided is a stacked body of six core pieces. The fourth core piece 34 and the fifth core piece 35 are alternately stacked on the third portion 20c. The first portion 20 a is the lower end portion of the split core 11 , that is, the laminated body, that is, one end portion in the first direction in the split core 11 . The second portion 20 b is the upper end of the split core 11 , that is, the laminated body, that is, the other end in the first direction among the split cores 11 . The third portion 20c is the center portion in the first direction in the split core 11, that is, the laminated body. The third portion 20c is stacked on the first portion 20a. The second portion 20b is stacked on the third portion 20c.

The surface 20c1 which is the lower end of the 3rd part 20c comprises the surface located in the upper end of the 1st groove part 16a. The upper end of the third portion 20c, that is, the surface 20c2 constitutes the lower end of the second groove portion 16b. As described above, the third portion 20c includes the surface 20c1 constituting the end of the first groove portion 16a in the first direction and the surface 20c2 constituting the end of the second groove portion 16b in the first direction. The groove portion 16 is not provided between the surface 20c1 and the surface 20c2.

FIG. 5 is a view showing a plan structure of the first to fifth core piece groups shown in FIGS. 3 and 4 . FIG. 6 is a diagram showing the configuration of the transverse cross section of the first to fifth core piece groups shown in FIGS. 3 and 4 . FIG. 7 is a diagram showing the configuration of the longitudinal section of the first to fifth core piece groups shown in FIGS. 3 and 4 .

5 shows four of the twelve first core pieces 31 constituting the first core piece group 21, four of the twelve second core pieces 32 constituting the second core piece group 22, 4 of the 12 third core pieces 33 of the 3-core piece group 23 , 4 of the 12 fourth core pieces 34 constituting the fourth core piece group 24 , and 12 of the 5th core piece group 25 Four of the fifth core pieces 35 . In FIG. 6 the same cross section as in FIG. 3 is shown. FIG. 7 shows the same longitudinal section as in FIG. 4 .

A hole 26 is provided in each of the first core pieces 31 excluding the one first core piece 31 constituting the end face 18 among the first core pieces 31 constituting the first core piece group 21 . In the first core piece 31 , the hole 26 is provided in the left end portion 36 of the yoke portion 12 . The first core pieces 31 constituting the first core piece group 21 are each provided with three holes 28 and notch portions 38 constituting the groove portions 16 .

A boss 27 is provided on each of the second core pieces 32 excluding the one second core piece 32 constituting the end face 19 among the second core pieces 32 constituting the second core piece group 22 . In the second core piece 32 , the boss portion 27 is provided on the right end portion 37 of the yoke portion 12 . Each of the second core pieces 32 constituting the second core piece group 22 is provided with three projections 29 and a notch portion 38 constituting the groove portion 16 .

A boss 27 is provided on each of the third core pieces 33 excluding the one third core piece 33 constituting the end face 18 among the third core pieces 33 constituting the third core piece group 23 . In the third core piece 33 , the boss portion 27 is provided on the left end portion 36 of the yoke portion 12 . Each of the third core pieces 33 constituting the third core piece group 23 is provided with three projections 29 and notches 38 constituting the grooves 16 .

A boss 27 is provided on each of the fourth core pieces 34 excluding the one fourth core piece 34 constituting the end face 19 among the fourth core pieces 34 constituting the fourth core piece group 24 . In the fourth core piece 34 , the boss portion 27 is provided on the right end portion 37 of the yoke portion 12 . Three bosses 29 are provided on each of the fourth core pieces 34 constituting the fourth core piece group 24 . The notch portion 38 is not provided in the fourth core piece 34 .

The bosses 27 are provided on each of the fifth core pieces 35 excluding the one fifth core piece 35 constituting the end face 18 among the fifth core pieces 35 constituting the fifth core piece group 25 . In the fifth core piece 35 , the boss portion 27 is provided on the left end portion 36 of the yoke portion 12 . Three bosses 29 are provided on each of the fifth core pieces 35 constituting the fifth core piece group 25 . The notch portion 38 is not provided in the fifth core piece 35 .

In FIG. 5 , the outer shape of the first core piece 31 is the same as the outer shape of the second core piece 32 except that the shapes of the end portions 36 and 37 are different. The outer shape of the first core piece 31 is the same as the outer shape of the third core piece 33 . The outer shape of the second core piece 32 is the same as the outer shape of the fourth core piece 34 except that the notch portion 38 is provided. The outer shape of the first core piece 31 is the same as the outer shape of the fifth core piece 35 except that the notch portion 38 is provided. As described above, the first to fifth core pieces 31 , 32 , 33 , 34 , and 35 have the same shape as each other except that at least one of the end portions 36 and 37 and the notch portion 38 is different from each other. . In addition, each of the first to fifth core pieces 31, 32, 33, 34, and 35 is formed to have the same size. By laminating the first to fifth core pieces 31 , 32 , 33 , 34 , and 35 as described above, the split core 11 can reduce unevenness that reduces the volume of the split core 11 . Thereby, the stator core 5 can pass as many magnetic fluxes as possible in the part other than the part provided with the slot part 16, and the torque which can be outputted by the motor 1 can be increased.

Each of the core pieces constituting the first portion 20a has the notch portion 38 of the same shape formed at the same position, and the shape of the ridgeline portion constituting the outer peripheral surface 15 in the outer shape of the core piece is the same. Each of the core pieces constituting the second portion 20b has the notch portion 38 of the same shape formed at the same position, and the shape of the ridgeline portion constituting the outer peripheral surface 15 in the outer shape of the core piece is the same. Each of the core pieces constituting the third portion 20c is not provided with the notch portion 38, and the shape of the ridgeline portion constituting the outer peripheral surface 15 among the outer shapes of the core pieces is the same.

The split core 11 is not limited to the core pieces provided with the bosses 27 at the end portions 36 and the core pieces provided with the bosses 27 at the end portions 37 being alternately stacked. The split core 11 may include a portion where the core pieces provided with the bosses 27 at the end portions 36 are stacked on each other, or may include a portion where the core pieces provided with the bosses 27 at the end portions 37 are stacked on each other.

The groove portion 16 is used to fix the position of the split core 11 in a holding mechanism for holding the split core 11 when the wire rod, ie, the magnetic wire, is wound around the split core 11 . FIG. 8 is a view showing a state in which a wire rod is wound around the split core constituting the stator core shown in FIG. 2 . A winding machine is used when the wire rod 41 is wound around the split core 11 . The winding machine revolves the nozzle 40 for supplying the wire rod 41 around the split core 11 , thereby winding the wire rod 41 around the teeth 13 of the split core 11 .

In FIG. 8 , the clamp 46 constituting the holding mechanism is shown. When the wire 41 is wound around the split core 11, one split core 11 is held by the holding mechanism. The stator core 5 is in a state of being bent between the split core 11 held by the holding mechanism and the split core 11 adjacent to the split core 11 . Thereby, a space for rotating the nozzle 40 is secured around the split core 11 held by the holding mechanism.

The inner claws 42 and the outer claws 43 and the inner claws 44 and the outer claws 45 constitute a conveying mechanism for conveying the split core 11 . The inner claw 44 and the outer claw 45 convey the split core 11 thrown into the holding mechanism. The inner claw 42 and the outer claw 43 convey the split core 11 discharged from the holding mechanism. The split cores 11 before being wound around the wire rod 41 are arranged in a row while being sandwiched by the inner claws 44 and the outer claws 45 facing each other. The split cores 11 wound with the wire rod 41 are arranged in a row in a state of being sandwiched by the inner claws 42 and the outer claws 43 facing each other.

FIG. 9 is a diagram for explaining the winding of the wire rod to the split core shown in FIG. 8 . FIG. 9 shows a state in which the nozzle 40 is rotated in the cross section at the line IX-IX shown in FIG. 8 . In FIG. 9 , the nozzle 40 is set to rotate counterclockwise around the tooth portion 13 .

While the nozzle 40 is rotated from the position P1 to the position P2 , the tension applied to the wire rod 41 acts on the right corner 51 among the lower ends of the teeth portion 13 . As shown in FIG. 9 , the direction of the tension applied to the corner 51 gradually changes from the direction of the arrow F1 to the direction of the arrow F2.

While the nozzle 40 is rotated from the position P2 to the position P3 , the tension applied to the wire 41 acts on the right corner 52 among the upper ends of the teeth 13 . As shown in FIG. 9 , the direction of the tension applied to the corner 52 gradually changes from the direction of the arrow F2 to the direction of the arrow F3 .

While the nozzle 40 is rotated from the position P3 to the position P4 , the tension applied to the wire 41 acts on the left corner 53 among the upper ends of the teeth 13 . As shown in FIG. 9 , the direction of the tension applied to the corner 53 gradually changes from the direction of the arrow F3 to the direction of the arrow F4.

While the nozzle 40 is rotated from the position P4 to the position P1 , the tension applied to the wire rod 41 acts on the left corner 54 among the lower ends of the tooth portion 13 . As shown in FIG. 9 , the direction of the tension applied to the corner 54 is gradually changed from the direction of the arrow F4 to the direction of the arrow F1 .

As described above, when the wire rod 41 is wound around the split core 11 , the tension of the wire rod 41 acts on the first core piece 31 constituting the lower end of the split core 11 and the second core piece 32 constituting the upper end of the split core 11 , respectively. The groove portion 16 is provided in the first portion 20 a including the lower end of the split core 11 and the second portion 20 b including the upper end of the split core 11 . The holding mechanism can hold the split core 11 at the first portion 20a that is the upper end portion and the second portion 20b that is the lower end portion. The groove portion 16 is not provided in the center portion of the split core 11 , that is, the third portion 20 c . The stator core 5 can utilize the center portion of the split core 11 in order to improve torque characteristics.

FIG. 10 is a first view showing a state in which the split core shown in FIG. 8 is held by a holding mechanism. FIG. 10 shows a cross section along the line XX shown in FIG. 8 . The holding mechanism has two clamps 46 and 47 facing each other. The holding mechanism holds the split core 11 by clamping the split core 11 with the two clamps 46 and 47 . The jig 46 is in contact with the second core piece 32 constituting the upper end of the split core 11 . The jig 47 is in contact with the first core piece 31 constituting the lower end of the split cores 11 .

A boss 48 is provided on a surface of the jig 46 opposite to the jig 47 . Similarly to the jig 46 , the jig 47 is provided with a boss 48 on the surface facing the jig 46 . A fitting portion 49 that can be fitted into the groove portion 16 is provided in the boss portion 48 provided on the jig 46 and the boss portion 48 provided on the jig 47 .

The clamp 46 can reciprocate in a direction approaching the clamp 47 and a direction away from the clamp 47 . The jig 47 can reciprocate in a direction approaching the jig 46 and a direction away from the jig 46 . The holding mechanism grips the split core 11 by moving the jig 46 and the jig 47 so that the jig 46 and the jig 47 approach each other with the split core 11 provided therebetween. The holding mechanism moves the clamp 46 and the clamp 47 away from each other from the state in which the split core 11 is held, thereby releasing the grasped split core 11 .

FIG. 11 is a second view showing a state in which the split core shown in FIG. 8 is held by a holding mechanism. FIG. 11 shows a cross section taken along the line XI-XI shown in FIG. 10 . FIG. 11 shows a state in which the fitting portion 49 of the jig 47 is fitted into the first groove portion 16a of the split core 11 held by the holding mechanism. The fitting portion 49 of the jig 46 is fitted into the second groove portion 16b of the split core 11 held by the holding mechanism, as in the case shown in FIG. 11 .

In the cross section shown in FIG. 11 , the first groove portion 16a has a so-called dovetail shape. The width of the first groove portion 16 a in the third direction increases from the outer peripheral surface 15 toward the tooth portion 13 . The fitting portion 49 is an end portion on the contact side with the split core 11 among the boss portions 48 , and is a portion projecting to the left and right in accordance with the shape of the first groove portion 16 a. In addition, the first groove portion 16a may have any shape as long as it has a shape having a portion in which the width in the third direction increases toward the teeth portion 13 from the outer peripheral surface 15 .

FIG. 12 is a perspective view showing a jig constituting the holding mechanism shown in FIG. 11 . FIG. 13 is a perspective view showing a state in which a core piece is fitted into the jig shown in FIG. 12 . In the jig 47 shown in FIG. 12 , the length of the protrusion 48 in the direction perpendicular to the surface 50 facing the jig 46 is La. The length of the first groove portion 16a in the first direction is longer than La.

FIG. 13 shows a state in which the first core piece 31 constituting the lower end of the split core 11 is fitted into the jig 47 . In a state in which the split core 11 is held by the holding mechanism, the regions 50 a on the left and right of the fitting portion 49 among the surfaces 50 are in contact with the first core pieces 31 .

The second groove portion 16b has the same shape as the first groove portion 16a. The width of the second groove portion 16 b in the third direction increases from the outer peripheral surface 15 toward the tooth portion 13 . The second groove portion 16b may have any shape as long as it has a shape having a portion in which the width in the third direction increases toward the teeth portion 13 from the outer peripheral surface 15 . The jig 46 shown in FIG. 10 has the same configuration as the jig 47 shown in FIGS. 11 to 13 . The manner in which the fitting portion 49 provided on the jig 46 is fitted into the second groove portion 16b is the same as the manner in which the fitting portion 49 provided on the jig 47 is fitted into the first groove portion 16a.

The groove portion 16 and the jigs 46 and 47 are configured as described above, whereby the fitting of the fitting portion 49 into the groove portion 16 and the extraction of the fitting portion 49 from the groove portion 16 cause the jigs 46 and 47 to be in contact with the split core 11 . It is performed by moving in a direction parallel to the first direction. In addition, in a state where the fitting portion 49 is fitted into the groove portion 16 , movement of the split core 11 in the second direction and the third direction with respect to the jigs 46 and 47 is suppressed.

The split cores 11 to be held by the holding mechanism may include split cores 11 whose lengths in the stacking direction are different from each other. It is assumed that when the holding mechanism holds the split core 11 using one jig, the jig is replaced according to the length of the split core 11 in the stacking direction. In Embodiment 1, the holding mechanism uses the two clamps 46 and 47 to hold the upper and lower ends of the split cores 11. Therefore, when holding the split cores 11 having different lengths in the lamination direction, a common one can be used. Clamps 46, 47. As described above, when the length of the holding mechanism in the lamination direction of the split cores 11 is varied, the split cores 11 can be held using the common jigs 46 and 47 .

As described above, the grooves 16 provided at the upper and lower ends of the split core 11 to which the tension acts are fixed by the clamps 46 and 47, thereby further suppressing the movement of the split core 11 due to the tension. . Thereby, the holding mechanism accurately positions the split iron core 11 and can hold the split iron core 11 . In addition, the holding mechanism can hold the split core 11 stably.

The accurate positioning of the split iron core 11 and the stable holding of the split iron core 11 can be performed, whereby the winding machine can perform accurate winding of the wire rod 41 to the split iron core 11 . Since the wire rod 41 can be accurately wound around the split core 11, the occurrence of defects in the winding of the wire rod 41 can be reduced, and the stator 2 can be manufactured with high productivity.

In addition, since the groove portion 16 is not provided in the center portion of the yoke portion 12 in the first direction, compared with the case where the groove portion 16 is provided in the entirety of the yoke portion 12 in the first direction, the yoke portion can be The volume of 12 is increased. As the volume of the yoke portion 12 increases, the magnetic flux that can pass through the yoke portion 12 increases, and thereby the torque that can be output from the motor 1 increases. Therefore, by increasing the current flowing to the motor 1 in the motor 1, the output torque can be increased, and high electrical characteristics can be obtained.

According to the first embodiment, in the stator core 5, the split core 11 includes the first portion 20a constituting the first groove portion 16a, the second portion 20b constituting the second groove portion 16b, and a portion between the first portion 20a and the second portion 20b. Part 3 20c of the inter-setup. The third portion 20c includes a surface 20c1 constituting an end of the first groove portion 16a and a surface 20c2 constituting an end of the second groove portion 16b, and the groove portion 16 is not provided in the third portion 20c. Thereby, the stator core 5 has the effect that the stator 2 can be manufactured with high productivity, and high electrical characteristics can be realized in the electric motor including the stator 2 .

Embodiment 2.

14 is a perspective view of a stator core constituting the stator according to Embodiment 2 of the present invention. In Embodiment 2, the third groove portion 60 is provided on the outer peripheral surface 15 of each split core 11 constituting the stator core 5 . In Embodiment 2, the same components as those in Embodiment 1 described above are denoted by the same reference numerals, and configurations different from those in Embodiment 1 will be mainly described.

The third groove portion 60 is provided at the center of the outer peripheral surface 15 in the third direction. Moreover, the 3rd groove part 60 is provided in the center part in the 1st direction in the outer peripheral surface 15. As shown in FIG. The 3rd groove part 60 is provided in the 3rd part between the 1st part provided with the 1st groove part 16a among the split cores 11, and the 2nd part provided with the 2nd groove part 16b. The third part is a laminated body of the core pieces constituting the third groove portion 60 among the plurality of core pieces constituting the split core 11 .

FIG. 15 is a plan view of split cores constituting the stator core shown in FIG. 14 . FIG. 15 shows a plane on the upper end side of the split core 11 . In the plane shown in FIG. 15 , the third groove portion 60 has a V-shape. The width of the third groove portion 60 in the third direction is smaller than the width of the second groove portion 16b in the third direction. In addition, the width of the third groove portion 60 in the third direction is smaller than the width of the first groove portion 16a in the third direction. In addition, the shape of the third groove portion 60 is not limited to the V shape, and may be a shape other than the V shape. The shape of the third groove portion 60 may be a rectangle, a semicircle, or the like.

FIG. 16 is a diagram showing a transverse cross-section of the stator core shown in FIG. 14 . FIG. 17 is a view showing a longitudinal section of the stator core shown in FIG. 14 . FIG. 16 shows the same cross-section as that shown in FIG. 3 . FIG. 17 shows the same longitudinal section as that shown in FIG. 4 . In the stator core 5 according to Embodiment 2, a fourth core piece group 61 and a fifth core piece group 62 are provided instead of the fourth core piece group 24 and the fifth core piece group 25 shown in FIGS. 3 and 4 . The fourth core piece 64 is a core piece constituting the fourth core piece group 61 . The fifth core piece 65 is a core piece constituting the fifth core piece group 62 .

As shown in FIG. 17, the 3rd part 20c which comprises the 3rd groove part 60 is a laminated body of 6 core pieces. The fourth core piece 64 and the fifth core piece 65 are alternately stacked on the third portion 20c. The depth of the third groove portion 60 in the second direction is smaller than the depth of the first groove portion 16a in the second direction, and is smaller than the depth of the second groove portion 16b in the second direction. The third portion 20c includes a surface 20c1 constituting an end in the first direction of the first groove portion 16a and a surface 20c2 constituting an end in the first direction of the second groove portion 16b. Between the surface 20c1 and the surface 20c2, the groove part of the depth more than the depth of the 1st groove part 16a and the 2nd groove part 16b is not provided.

FIG. 18 is a view showing the plan structure of the first to fifth core piece groups shown in FIGS. 16 and 17 . FIG. 19 is a diagram showing the configuration of the longitudinal section of the first to fifth core piece groups shown in FIGS. 16 and 17 .

The notch part 63 which comprises the 3rd groove part 60 is provided in the 4th core piece 64 which comprises the 4th core piece group 61, respectively. In addition, the boss|hub part 27 is provided in the 4th core piece 64 similarly to the 4th core piece 34 of Embodiment 1. As shown in FIG. The notch part 63 which comprises the 3rd groove part 60 is provided in the 5th core piece 65 which comprises the 5th core piece group 62, respectively. In addition, the boss|hub part 27 is provided in the 5th core piece 65 similarly to the 5th core piece 35 of Embodiment 1. As shown in FIG. In addition, the cross-sectional structure of the fourth and fifth core piece groups 61 and 62 is the same as the cross-sectional structure of the fourth and fifth core piece groups 24 and 25 shown in FIG. 6 .

The shapes of the first to fifth core pieces 31 , 32 , 33 , 64 , and 65 are the same as each other except that at least one of the shapes of the end portions 36 and 37 and the shapes of the cutout portions 38 and 63 are different from each other. In addition, each of the first to fifth core pieces 31, 32, 33, 64, and 65 is formed to have the same size. Each of the core pieces constituting the third portion 20c has the notch portion 63 of the same shape formed at the same position, and the shape of the ridgeline portion constituting the outer peripheral surface 15 in the outer shape of the core piece is the same.

The third groove portion 60 is used when transporting the split cores 11 thrown into the holding mechanism and when transporting the split cores 11 discharged from the holding mechanism. FIG. 20 is a diagram showing a state in which the split core shown in FIG. 14 is conveyed. In the second embodiment, the outer claw 45 and the outer claw 43 are provided with the bosses 66 that can be fitted into the third grooves 60 . In addition, in FIG. 20 , in order to show the positional relationship of each element, when there is an element and an element arranged on the far side of the element on the drawing side, the element on the near side on the drawing plane has the far side on the drawing plane. The elements on the side are shown through the visible part.

During the winding of the wire rod 41 to the split core 11 , the conveying mechanism lifts upward the end of the inner claw 44 and the outer claw 45 opposite to the jig 46 side, as in the case shown in FIG. 8 . up gesture. In addition, while the wire rod 41 is being wound around the split core 11 , the conveying mechanism raises the end of the inner claw 42 and the outer claw 43 opposite to the jig 46 side upward, as shown in FIG. 8 . attitude.

FIG. 21 is a view showing a state in which the wire rod is being wound on the split core shown in FIG. 14 . FIG. 22 is an enlarged view of a portion including a third groove portion and a fitting portion in the structure shown in FIG. 21 . FIG. 21 shows a plane on the upper surface side of the split core 11 . In addition, the part enclosed by the broken line in FIG. 21 shows the state in which the fitting part 49 is fitted in the 1st groove part 16a in the cross section of the split core 11 and the boss|hub part 48. As shown in FIG. In FIG. 22, the area XXII shown in FIG. 21 is enlarged and shown.

The boss 66 of the outer claw 45 is provided at a position facing the split iron core 11 at the end on the jig 47 side among the split iron cores 11 held by the inner claw 44 and the outer claw 45 . The boss portion 66 faces the third groove portion 60 provided in the split core 11 . The boss portion 66 has a convex shape that can be fitted into the third groove portion 60 .

The outer claw 43 shown in FIG. 21 is also provided with the same boss 66 as the boss 66 shown in FIG. 22 . The boss 66 of the outer claw 43 is provided at a position facing the split core 11 at the end on the jig 47 side among the split cores 11 held by the inner claw 42 and the outer claw 43 . The boss portion 66 faces the third groove portion 60 provided in the split core 11 . The convex portion 66 of the outer claw 43 also has a convex shape that can be fitted into the third groove portion 60 .

When the winding of the wire rod 41 in one split iron core 11 is completed, the conveying mechanism starts from the state shown in FIG. 8 , as shown in the first stage from the top in FIG. The split core 11 held by 45 , the split core 11 held by the holding mechanism, and the split core 11 held by the inner claw 42 and the outer claw 43 are arranged in a straight line, and the posture is changed.

Next, as shown in the second stage from the top in FIG. 20 , the inner claw 42 and the outer claw 43 move in a direction away from each other. The inner claws 42 and the outer claws 43 are separated from the split core 11 between the inner claws 42 and the outer claws 43 . Then, the inner claw 42 and the outer claw 43 move until the boss portion 66 reaches above the split core 11a held by the holding mechanism.

Next, the inner claw 42 and the outer claw 43 are moved toward each other. As shown in the third stage from the top in FIG. 20 , the inner claw 42 and the outer claw 43 are in contact with the split core 11 between the inner claw 42 and the outer claw 43 .

Fig. 23 is a view showing a state in which the split core shown in Fig. 20 is held by a conveying mechanism. In FIG. 23, the cross section perpendicular|vertical to the cross section shown in FIG. 21, and the cross section which penetrates the 1st groove part 16a, the 2nd groove part 16b, and the 3rd groove part 60 is shown. The protruding portion 66 of the outer claw 43 is fitted into the third groove portion 60 of the split core 11 held by the holding mechanism. Then, the holding mechanism moves the jig 46 and the jig 47 in a direction away from each other, thereby releasing the grasped split core 11 .

After the holding mechanism releases the split iron core 11, the conveying mechanism causes the inner claw 42 and the outer claw 43 in the state of holding the split iron core 11 and the inner claw 44 and the outer claw 45 in the state of holding the split iron core 11 relative to the jig. 46, 47 and move. As the inner claw 42 and the outer claw 43 move, as shown in the fourth stage from the top in FIG. 20 , the split core 11 a held by the holding mechanism is ejected from the holding mechanism. In addition, when the inner claw 44 and the outer claw 45 move, the split core 11b to be wound next is thrown into the holding mechanism. The groove portion 16 of the split core 11 b thrown into the holding mechanism is positioned at the position of the fitting portion 49 .

Then, the holding mechanism moves the jig 46 and the jig 47 so that the jig 46 and the jig 47 approach each other, thereby grasping the split core 11b. The fitting portion 49 is fitted into the groove portion 16 of the split core 11b inserted into the holding mechanism. Thereby, the holding mechanism holds the split core 11b thrown into the holding mechanism.

Next, the inner claw 44 and the outer claw 45 are moved in directions away from each other. The inner claw 44 and the outer claw 45 are separated from the split core 11 between the inner claw 44 and the outer claw 45 . Then, the inner claw 44 and the outer claw 45 move until the boss 66 reaches a position facing the split core 11c adjacent to the right side of the split core 11b held by the holding mechanism. Then, the inner claw 44 and the outer claw 45 move toward each other. The inner claw 44 and the outer claw 45 are in contact with the split core 11 between the inner claw 44 and the outer claw 45 . The boss portion 66 of the outer claw 45 is fitted into the third groove portion 60 of the split core 11c.

Then, the conveying mechanism returns to the same posture as that shown in FIG. 8 . The winding machine starts winding the wire rod 41 to the split core 11 held by the holding mechanism. The holding mechanism and the conveying mechanism repeat the above-described operations, whereby the wire rod 41 is wound around the divided cores 11 of the stator core 5 .

The holding mechanism holds the split core 11 by fitting the fitting portion 49 into the groove portion 16 in a state where the boss portion 66 of the outer claw 45 is fitted into the third groove portion 60 . In addition, the conveying mechanism engages the protrusion 66 of the outer claw 43 in the third groove 60 with the fitting portion 49 fitted into the groove 16 to grasp the split core 11 discharged from the holding mechanism. Thereby, the conveyance mechanism can reduce the problem in conveyance of the split core 11 . For example, the transport mechanism can reduce transport errors caused by fluctuations in the size of the split core 11 .

According to Embodiment 2, the third groove portion 60 having a width smaller than that of the groove portion 16 is provided in the third portion 20 c of the split core 11 . Also in Embodiment 2, the volume of the yoke portion 12 can be increased compared to the case where the groove portion 16 is provided over the entirety of the first direction. The motor 1 can increase the torque that can be output, and can obtain high electrical characteristics. In addition, the split iron core 11 is provided with the first groove portion 16a and the second groove portion 16b, whereby the holding mechanism can accurately position the split iron core 11 and stably hold the split iron core 11 as in the case of the first embodiment. . Thereby, the stator core 5 has the effect that the stator 2 can be manufactured with high productivity, and high electrical characteristics can be realized in the electric motor including the stator 2 . In addition, the stator core 5 can reduce problems in the transport of the split core 11 by the transport mechanism.

Embodiment 3.

In Embodiment 3, the relationship between the lengths of the first groove portion 16a in the first direction and the length of the second groove portion 16b in the first direction will be described. 24 is a cross-sectional view of a split core constituting a stator according to Embodiment 3 of the present invention. FIG. 24 shows the same cross section as that shown in FIG. 3 . The split core 11 shown in FIG. 24 has the same structure as the split core 11 of the second embodiment. The split core 11 of the third embodiment may have the same structure as the split core 11 of the first embodiment. In Embodiment 3, the same reference numerals are given to the same components as those in Embodiments 1 and 2 described above, and configurations different from those in Embodiments 1 and 2 will be mainly described.

In FIG. 24, L1 is the length of the 1st groove part 16a in the 1st direction. L2 is the length of the 2nd groove part 16b in the 1st direction. L3 is the length of the split core 11 in the first direction, that is, the length between the lower end 72 of the split core 11 and the upper end 73 of the split core 11 . L4 is the length of the 1st groove part 16a and the 3rd groove part 60 in the 1st direction. In Embodiment 3, L1<L2 holds. Moreover, L1 and L2 are set so that the difference of L2 and L1 may become large compared with the fluctuation range of the length assumed by the fluctuation|variation of the thickness 70 of an iron core piece and the fluctuation|variation of the spacing 71 of an iron core piece.

Next, the effect obtained when L1 < L2 is established will be described. The larger the number of laminated core pieces, the larger the fluctuation range due to the ripple. Therefore, "the variation width of L1 < the variation width of L4 < the variation width of L3" holds. In addition, since L2=L3-L4 holds, the relationship of "the fluctuation range of L1 < the fluctuation range of L2" is assumed.

Here, the length in the first direction of the boss portion 48 provided on the jigs 46 and 47 shown in FIG. 10 is referred to as La. In addition, when L1=Lb, let the space|interval necessary to insert the protrusion part 48 whose length is La into the 1st groove part 16a is Lg. In this case, Lb=La+Lg holds.

When the split core 11 is manufactured, when L3 exceeds an appropriate range, L3 can be adjusted by reducing the number of laminated core pieces. In this case, the core pieces are removed from the upper end side of the split core 11 . The reason for removing the core piece from the upper end side will be described later. Let the adjustment maximum amplitude of L3 when L3=Ld be Le. In this case, it is assumed that L2=Lc, and Lc=Lb+Le=La+Le+Lg holds. In addition, the relationship of La<Lb<Lc holds. The specification of the split core 11 for which the above conditions are satisfied may be referred to as specification 1 in the following description.

25 is a diagram showing a first configuration example of the split core in Embodiment 3. FIG. FIG. 26 is a view showing a state in which the split core shown in FIG. 25 is held by a holding mechanism. The first structural example is an example in which L3 is within an appropriate range in the split core 11 of the above-mentioned specification 1 and the manufactured split core 11 . Ldmax is set to the maximum value of the appropriate range. Ldmin is set to the minimum value of the appropriate range. In this case, as shown in FIG. 26 , the boss portion 48 of the clip 47 is inserted into the first groove portion 16a, and the boss portion 48 of the clip 46 is inserted into the second groove portion 16b. The holding mechanism can hold the split core 11 normally.

FIG. 27 is a diagram showing a second configuration example of the split core in Embodiment 3. FIG. The second structural example is an example in the case where the split core 11 of the above-mentioned specification 1 has L3 of the manufactured split core 11 exceeding an appropriate range. In the case shown in FIG. 27, L3 is longer than Ldmax. In this case, the core piece is removed from the upper end side of the manufactured split core 11 , and adjustment is performed so that L3 is within an appropriate range. In addition, when L3 is shorter than Ldmin, since adjustment so that L3 may fall within an appropriate range cannot be performed, the manufactured split core 11 is discarded.

When adjusting L3 , it is assumed that the core pieces are removed from the lower end side of the split core 11 . When the first core piece 31 constituting the lower end 72 is removed from the split core 11 shown in FIG. 27 , the boss 29 provided on the second core piece from the bottom protrudes from the split core 11 . Therefore, the amount of decrease in L3 is reduced in accordance with the remaining amount of the raised portion 29 . In addition, the boss portion 29 is in a state of protruding from the lower end 72 of the split core 11, whereby the holding of the split core 11 in the holding mechanism may become unstable. On the other hand, when the second core piece 32 constituting the upper end 73 is removed from the split core 11 shown in FIG. 27 , the boss 29 does not protrude from the split core 11 . The amount of decrease in L3 is equivalent to the thickness of 70 . In addition, the lower end 72 of the split core 11 can be made flat, whereby the split core 11 can be stably held by the holding mechanism. Therefore, when adjusting L3 , the core pieces are removed from the upper end side of the split core 11 .

FIG. 28 is a view showing a state in which the length in the first direction is adjusted with respect to the split core shown in FIG. 27 . The split core 11 shown in FIG. 28 is the split core 11 according to the second structural example, and the second core piece 32 constituting the upper end 73 is removed from the state shown in FIG. 27 . The upper end 73 of the split core 11 shown in FIG. 28 is constituted by the third core piece 33 . As shown in Fig. 28, L3 is adjusted within an appropriate range.

FIG. 29 is a view showing a state in which the adjusted split core shown in FIG. 28 is held by a holding mechanism. As shown in FIG. 29, the boss|hub part 48 of the jig|tool 47 is inserted in the 1st groove part 16a. In addition, since Lc=La+Le+Lg holds, even when Le is subtracted from L2 by adjusting L3, the length of the protrusion 48 that can be inserted into the second groove 16b, that is, La is secured at L2 +Lg. Therefore, the holding mechanism can insert the boss portion 48 of the clip 46 into the second groove portion 16b. Thereby, the holding mechanism can normally hold the adjusted split core 11 .

30 is a view showing a split core according to a first comparative example of Embodiment 3. FIG. The first comparative example is a configuration example in a case where L1<L2 is not satisfied. In the split core 11 shown in FIG. 30 , L1=L2=Lc=La+Le+Lg holds. The specification of the split core 11 for which this condition is satisfied may be referred to as specification 2 in the following description. The first comparative example is an example in which L3 is within an appropriate range in the split core 11 of the specification 2 and the split core 11 produced.

FIG. 31 is a view showing a state in which the split core shown in FIG. 30 is held by a holding mechanism. The length of the first groove portion 16a and the length of the second groove portion 16b are each longer than the length La+Lg at which the boss portion 48 can be inserted by the amount of Le. Since the bosses 48 of the clip 47 are inserted into the first grooves 16a, and the bosses 48 of the clips 46 are inserted into the second grooves 16b, the holding mechanism can hold the split core 11 normally. However, a useless space 74 corresponding to Le is generated between the upper end of the first groove portion 16a and the upper end of the boss portion 48 of the jig 47 . Compared with the case shown in FIG. 26 , the volume of the yoke portion 12 is reduced by the interval 74, and therefore the torque that can be output by the motor 1 is reduced.

32 is a view showing a split core according to a second comparative example of Embodiment 3. FIG. The second comparative example is a configuration example in a case where L1<L2 is not satisfied. In the split core 11 shown in FIG. 32 , L1=L2=Lb=La+Lg holds. The specification of the split core 11 for which this condition is satisfied may be referred to as specification 3 in the following description. The second comparative example is an example in the case where L3 is within an appropriate range in the split core 11 of the specification 3 and the manufactured split core 11 .

FIG. 33 is a view showing a state in which the split core shown in FIG. 32 is held by a holding mechanism. The boss portion 48 of the jig 47 is inserted into the first groove portion 16a. In addition, the boss portion 48 of the clip 46 is inserted into the second groove portion 16b. The holding mechanism can hold the split core 11 normally.

34 is a view showing a split core according to a third comparative example of Embodiment 3. FIG. The third comparative example is an example in the case where L3 exceeds the appropriate range in the split core 11 of the above-mentioned specification 3 and the manufactured split core 11 . In the case shown in FIG. 34, L3 is longer than Ldmax. In this case, as in the case of the second structural example shown in FIG. 27 , L3 is adjusted so as to be within an appropriate range by removing the core pieces from the upper end side of the split core 11 to be manufactured.

FIG. 35 is a diagram showing a state in which the length in the first direction is adjusted with respect to the split core shown in FIG. 34 . The split core 11 shown in FIG. 35 is the split core 11 according to the third comparative example, and the second core piece 32 constituting the upper end 73 is removed from the state shown in FIG. 34 . The upper end 73 of the split core 11 shown in FIG. 35 is constituted by the third core piece 33 . As shown in FIG. 35, L3 is adjusted so as to be within the proper range.

FIG. 36 is a view showing a state in which the adjusted split core shown in FIG. 35 is held by a holding mechanism. Regarding L1, that is, Lb, the boss 48 of the jig 47 is inserted into the first groove 16a in order to secure La+Lg, which is a length capable of inserting the boss 48 into the first groove 16a. On the other hand, when L2=Lb=La+Lg is established, if Le is subtracted from L2 by adjusting L3, L2 is longer than La+, which is the length at which the boss 48 can be inserted into the first groove portion 16a. Lg becomes shorter. Therefore, in the holding mechanism, a gap 75 is generated between the upper end 73 of the split core 11 and the jig 46 . Due to the generation of the gap 75, the holding of the split core 11 by the holding mechanism becomes insufficient. As described above, with the specification 3, when adjustment of L3 is required, accurate positioning of the split core 11 in the holding mechanism and stable holding of the split core 11 by the holding mechanism become difficult.

According to the third embodiment, in the stator core 5, the length of the second groove portion 16b in the second direction is longer than the length of the first groove portion 16a in the first direction, so that accurate positioning of the split core 11 in the holding mechanism can be achieved. Positioning and stable holding of the split core 11 by the holding mechanism. In addition, the motor 1 can obtain high electrical characteristics. Thereby, the stator core 5 has the effect that the stator 2 can be manufactured with high productivity, and high electrical characteristics can be realized in the electric motor including the stator 2 .

The motor provided with the stator 2 according to Embodiments 1 to 3 is not limited to the motor 1 . The stator 2 may be provided in a motor other than the motor 1 . In Embodiment 4, the case where the stator 2 is provided in one of the motors other than the motor 1, that is, the linear motor, will be described.

Embodiment 4.

37 is a cross-sectional view of a linear motor including an armature according to Embodiment 4 of the present invention. In Embodiment 4, the same components as those in Embodiments 1 to 3 described above are denoted by the same reference numerals, and configurations different from those in Embodiments 1 to 3 will be mainly described. The electric motor, that is, the linear motor 80 has an armature 81 and a field element 82 opposed to each other. In Embodiment 4, the armature 81 is a movable element, and the field element 82 is a stator.

The armature 81 includes an armature core 83 , an insulator 6 for insulating the armature core 83 , and a coil 7 for generating a magnetic field. The armature core 83 has a plurality of divided cores 11 connected to each other. The armature core 83 has the same structure as the stator core 5 of the first embodiment. The armature core 83 may have the same structure as the stator core 5 of the second or third embodiment.

The field element 82 has a plate-shaped field element iron core 84 and a plurality of permanent magnets 85 arranged on the field element iron core 84 . The linear motor 80 generates a magnetic field by flowing a current to the coil 7 , so that the armature 81 is relatively moved with respect to the field element 82 . The armature 81 moves in the direction in which the plurality of permanent magnets 85 are arranged. Further, the linear motor 80 may have an armature 81 as a stator and a field element 82 as a movable member.

In the armature core 83, the split core 11 includes a first portion 20a constituting the first groove portion 16a, a second portion 20b constituting the second groove portion 16b, and a second portion provided between the first portion 20a and the second portion 20b. 3 part 20c. The third portion 20c includes a surface 20c1 constituting an end of the first groove portion 16a and a surface 20c2 constituting an end of the second groove portion 16b. According to the third embodiment, as in the case of the stator core 5 of the first embodiment, the armature core 83 has the effect that the armature 81 can be manufactured with high productivity and can be realized in a motor having the armature 81 high electrical characteristics.

The configurations shown in the above embodiments represent an example of the contents of the present invention, and can be combined with other known technologies, and a part of the configurations can be omitted or changed without departing from the gist of the present invention.

Description of the label

1 motor, 2 stator, 3 rotor, 4 frame, 5 stator core, 6 insulator, 7 coil, 8 rotor core, 9 shaft, 10, 85 permanent magnet, 11, 11a, 11b, 11c split core, 12 yoke, 13 Tooth part, 14 connecting part, 15 outer peripheral surface, 16 groove part, 16a first groove part, 16b second groove part, 17 crimping part, 18, 19 end face, 20a part 1, 20b part 2, 20c part 3 , 20c1, 20c2, 50 faces, 21 1st core piece set, 22 2nd core piece set, 23 3rd core piece set, 24, 61 4th core piece set, 25, 62 5th core piece set, 26, 28 Holes, 27, 29, 48, 66 bosses, 30, 75 gaps, 31 1st core piece, 32 2nd core piece, 33 3rd core piece, 34, 64 4th core piece, 35, 65 5th core piece Piece, 36, 37 End, 38, 63 Notch, 40 Nozzle, 41 Wire, 42, 44 Inner Claw, 43, 45 Outer Claw, 46, 47 Clamp, 49 Fitting, 50a Area, 51, 52, 53 , 54 angle, 60 third slot, 70 thickness, 71, 74 interval, 72 lower end, 73 upper end, 80 linear motor, 81 armature, 82 excitation element, 83 armature core, 84 excitation element core.

Claims (10)

1. An armature core having a plurality of divided cores each being a laminated body of a plurality of core pieces, the plurality of divided cores being connected to each other,

the armature core is characterized in that,

each of the plurality of divided cores has a yoke portion and a tooth portion protruding from the yoke portion in a 2 nd direction perpendicular to a 1 st direction which is a direction in which the plurality of core segments are stacked,

a 1 st groove portion and a 2 nd groove portion are provided on a 2 nd surface of the yoke portion opposite to the 1 st surface on which the tooth portion is provided, the 1 st groove portion and the 2 nd groove portion each being recessed in the 2 nd direction,

the laminate comprises a 1 st portion constituting the 1 st groove part, a 2 nd portion constituting the 2 nd groove part, and a 3 rd portion provided between the 1 st portion and the 2 nd portion in the 1 st direction,

the 3 rd portion includes a surface constituting an end of the 1 st groove portion in the 1 st direction and a surface constituting an end of the 2 nd groove portion in the 1 st direction.

2. An armature core according to claim 1,

the core piece constituting the 1 st segment has a notch portion constituting the 1 st groove portion,

the core piece constituting the 2 nd portion has a notch portion constituting the 2 nd groove portion.

3. An armature core according to claim 1 or 2,

the 1 st part is one end in the 1 st direction among the laminated bodies,

the 2 nd part is the other end in the 1 st direction among the laminated bodies.

4. An armature core according to any one of claims 1 through 3,

the length of the 2 nd groove portion in the 1 st direction is longer than the length of the 1 st groove portion in the 1 st direction.

5. An armature core according to any one of claims 1 through 4,

the 3 rd part is a central part in the 1 st direction among the laminated bodies.

6. An armature core according to any one of claims 1 through 5,

a 3 rd groove portion recessed in the 2 nd direction is provided between the 1 st groove portion and the 2 nd groove portion in the 2 nd surface,

the width of the 3 rd groove part in the 3 rd direction perpendicular to the 1 st direction and the 2 nd direction is smaller than the width of the 1 rd groove part in the 3 rd direction and smaller than the width of the 2 nd groove part in the 3 rd direction.

7. An armature core according to claim 6,

the core piece constituting the 3 rd portion is formed by having a notch portion constituting the 3 rd groove portion.

8. An armature core according to any one of claims 1 through 7,

the 1 st groove portion has a shape having a portion where a width in a 3 rd direction perpendicular to the 1 st direction and the 2 nd direction is enlarged from the 2 nd surface toward the tooth portion,

the 2 nd groove portion has a shape having a portion where a width in the 3 rd direction is enlarged from the 2 nd surface toward the tooth portion.

9. An armature, characterized in that it comprises a first armature body,

an armature core having the structure as claimed in any one of claims 1 to 8.

10. An electric motor, comprising:

the armature of claim 9; and

and an exciting element.

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