JP2008278741A - Coil member, motor, and manufacturing method of coil member - Google Patents

Abstract

A coil member including a coil bobbin used for a small motor can be damaged by a mold when the molded product is released from the mold. There are provided a coil member having no coil, a motor using the coil member, and a method of manufacturing the coil member.
In a coil member 45 that is injection-molded by two molds that move to the left and right in a direction orthogonal to the axial direction along a trunk portion 100 ', the outer peripheral surface has a circular shape wound around the outer peripheral surface. A flat portion formed inside the outer peripheral surface so as to ensure a space between the inner peripheral surface of the winding and not interfering with the two dies when the two dies are separated. 101 is provided, and the joint portion 400 on the body portion 100 ′ formed along the joint portion of the two molds is positioned on the plane portion 101.
[Selection] Figure 2

Description

The present invention relates to a coil member, a motor using the coil member, and a method for manufacturing the coil member.

  As a drive device such as a stepping motor, a coil device formed by winding a coil around a coil member made of a coil bobbin or the like is used. A coil member used in such a coil device is generally made by injecting a resin together with a stator core into a space formed by combining a plurality of divided resin molds as a mold, and after the resin is solidified, Remove and form. Therefore, a burr | flash may generate | occur | produce as a protruding shape on the mating surface of a molded resin mold. When this burr is formed on the body portion around which the winding is wound, the burr and the winding may come into contact with each other and the winding may be disconnected. In order to prevent this, as shown in FIG. 8, the cylindrical part 201 of the body part 207 around which the winding is wound is joined to the party which is the edge of the mating surface of the molded resin molds 204 and 204 ′ shown in FIG. An undercut portion 202 is formed along an undulation line 205, and a generated burr 203 is formed at a position submerged from a winding surface 208 to prevent disconnection (see, for example, Patent Document 1). ).

JP 2003-347117 A

  As shown in FIG. 9, such a coil member is formed by the molded resin molds 204 and 204 ′ in the above-described Patent Document 1 and forms the undercut portion 202 as described above. 207 is released from the molded resin molds 204 and 204 ′. However, when the molded resin molds 204 and 204 ′ are separated in the directions indicated by the arrows P and P ′, there is a problem that the protruding portions 206 and 206 ′ of the molded resin molds 204 and 204 ′ interfere with the body portion 207. In particular, in a coil member used for a small motor, since the body portion 207 is thin, when the molded resin molds 204 and 204 ′ are separated from each other, they interfere with the protrusions 206 and 206 ′, causing cracks in the body portion 207. In this case, there is a problem that the coil member cannot be withstood by the winding pressure wound around the body 207 and the coil member is damaged.

  In view of the above problems, an object of the present invention is to prevent disconnection and damage due to burrs of windings and to separate a molded product from a mold even for a coil member including a coil bobbin used for a small motor. It is providing the coil member which is not damaged by a metal mold | die when making it, the motor using the coil member, and the manufacturing method of the coil member.

  In order to solve the above-described problem, in the present invention, a cylindrical body portion in which a winding is wound in a circular shape on an outer peripheral surface is moved to the left and right in a direction orthogonal to the axial direction along the body portion. In the coil member that is injection-molded by a mold, the outer peripheral surface is located on the inner side of the outer peripheral surface so that a space is secured between the outer peripheral surface and the inner peripheral surface of the circular winding wound around the outer peripheral surface. And a body portion formed along a joint portion of the two molds, provided with a flat portion formed so as not to interfere with the two molds when the two molds are separated from each other. The upper joint portion is positioned on the flat surface portion.

  If comprised in this way, when a metal mold | die separates, since it does not interfere with the said cylindrical trunk | drum, even if it is a coil member containing the coil bobbin used for a small motor, the molded coil member is released from a metal mold | die. In this case, it is possible to prevent damage by the mold. Even when burrs occur along the joint formed along the joint between the two molds, disconnection or damage due to burrs of the winding can be prevented. In addition, the said plane part can be formed in the parallel plane formed in parallel with the separation direction of the said two metal molds, when separating two metal molds. Moreover, the coil member which consists only of a coil bobbin may be sufficient as the coil member in this invention, a coil bobbin with a terminal part may be sufficient, and also the coil bobbin integrated with the stator core may be sufficient.

  In the present invention, it is preferable that the flat portion is formed so that a burr formed along the joining portion does not come into contact with a winding wound around the trunk portion. Specifically, the length in the circumferential direction of the planar portion is the inner circumferential surface of a winding in which a burr formed in the joint portion is wound in a circle along the outer circumferential surface of the cylindrical body portion. What is necessary is just to set to the length which does not contact with. If comprised in this way, even when a burr | flash generate | occur | produces in the junction part formed along the junction location of two metal mold | die, the disconnection and damage by the burr | flash of a coil | winding can be prevented reliably. In this case, it is preferable that two parallel planes that face each other across the center of the cylindrical body portion are formed on the outer peripheral surface of the cylindrical body portion.

  In the present invention, the body portion is formed with ring-shaped flange portions that are respectively protruded in the circumferential direction from both end portions in the axial direction, and a space in which the pair of flange portions are formed to face each other. It is preferable that the winding portion is a winding portion in which the winding is wound in a circular shape, and that the flat portion is formed in all regions in the axial direction of the trunk portion sandwiched between the flange portions. If comprised in this way, even if it is a case where a coil | winding is wound to the both ends of the axial direction of a trunk | drum, the disconnection and damage by generation | occurrence | production of a burr | flash can be prevented.

  In the present invention, it is preferable that a stator core having pole teeth is integrally formed on the body by insert molding as injection molding.

  In the present invention, it is preferable that the pole teeth are insert-molded on the inner wall side of the trunk portion, or the inner circumferential surface of the pole teeth is exposed from the inner circumferential surface of the trunk portion. In the present invention, when the mold is separated, the barrel does not interfere with the mold, so even if the pole teeth are integrally formed by insert molding on the inner wall side of the barrel, Even when the inner peripheral surface of the pole tooth is exposed from the inner peripheral surface of the body portion, the pole tooth is not pressurized and protrudes from the inner peripheral surface of the body portion when the mold is separated. Therefore, the pole teeth are disposed close to the rotor magnet because the pole teeth are insert-molded on the inner wall side of the trunk portion, and the inner circumferential surface of the pole teeth is exposed from the inner circumference surface of the trunk portion. Therefore, the efficiency of the motor can be improved and the radial width of the body portion can be reduced.

  In the present invention, the pole teeth may be formed so as to overlap the joint portion in the radial direction. In the present invention, since the body portion does not interfere with the mold when the mold is separated, even if the pole teeth are formed so as to overlap with the joint portion in the radial direction, the pole teeth are within the body portion. It does not protrude from the peripheral surface. Therefore, the degree of freedom in designing the motor is improved, and as a result, the efficiency of the motor can be improved.

  This point will be described in detail. For example, in the structure in which the undercut portion is formed along the joint portion as shown in the background art, the protruding portion of the mold forming the undercut portion is separated from the body portion when the mold is separated. Interferes with the undercut part. Therefore, when it arrange | positions so that a junction part may overlap with at least one of the pole teeth in the radial direction, there is a problem that the pole teeth are inclined to the inside of the trunk and protrude from the inside of the trunk. One possible countermeasure is to increase the wall thickness of the body so that the pole teeth do not tilt inside the body even if the mold protrusion shown in the background art interferes with the body. However, there is a problem that the space factor of the windings on the trunk portion is reduced by the thickness of the trunk portion. On the other hand, it is conceivable to increase the distance from the pole teeth to the outer periphery of the rotor so that the pole teeth do not come into contact with the outer periphery of the rotor even if the pole teeth are tilted to the inside of the trunk. There is a problem that the space factor of the winding of the wire decreases. Further, although it is conceivable to arrange the pole teeth so as to avoid the undercut portion, there is a problem that the degree of freedom in designing the motor is lowered, and consequently the efficiency of the motor is lowered.

  According to the present invention, when the mold is separated, the body portion does not interfere with the mold, so even if the pole teeth are formed so as to overlap the joint portion in the radial direction, the pole teeth are the body portion. It does not tilt inside and does not protrude from the inside of the trunk. Therefore, even when the pole teeth are formed so as to overlap the joint portion in the radial direction, the space factor of the winding on the trunk portion is not reduced, and the distance from the pole teeth to the outer periphery of the rotor magnet is not reduced. Without increasing the distance, the degree of freedom in designing the motor, that is, the degree of freedom in arranging the pole teeth can be improved, and thus the efficiency of the motor can be improved.

  In this invention, it is preferable that the said junction part is on the said plane part, Comprising: It is formed in the approximate center of the direction which the said 2 metal mold | die separates. If comprised in this way, the tolerance | permissibility which prevents a burr | flash from contact | abutting to a coil | winding can be enlarged compared with the case where a junction part is biased and formed in one side of a plane part.

  In the present invention, it is preferable that at least a pair of the plane portions are formed at point-symmetric positions with respect to the center of the body portion in a direction orthogonal to the axial direction. If comprised in this way, it can form using the slide type | mold which opens and closes the outer peripheral surface of the trunk | drum of a coil member to right and left. Therefore, the coil member can be released from the mold without damaging the coil member without using a special mold.

  The coil member according to the present invention includes a stator having a stator set in which windings are wound in a circular shape on the outer peripheral surface of a cylindrical body portion of the coil member, and a rotor magnet on the inner periphery side of the body portion. It can apply to the motor provided with the rotor which arrange | positioned. In such a motor, since the winding wound around the body portion of the coil member is prevented from being broken or damaged by burrs, the failure rate can be reduced.

  In the motor according to the present invention, the stator has pole teeth inserted into an inner yoke integrally formed by insert molding on the inner wall side of the barrel portion and a recess recessed in the radial direction from the inner wall side of the barrel portion. An outer yoke, and the pole teeth of the inner yoke and the pole teeth of the outer yoke may be arranged so as to alternately mesh with each other in the axial direction on the inner wall side of the body portion.

  In the motor according to the present invention, the pole teeth of the inner yoke and the pole teeth of the outer yoke are opposed to the rotor magnet in a state where the inner peripheral surface of the pole teeth is exposed from the inner wall side of the body portion. It is preferable that they are arranged. In this case, it is preferable that the pole teeth of the inner yoke and the pole teeth of the outer yoke are configured such that an outer peripheral surface and a side surface are covered with the body portion.

  The coil member according to the present invention can be manufactured as follows. In other words, a cylindrical barrel portion in which a winding is wound in a circular shape on the outer peripheral surface is formed by injection molding with two molds that move left and right in a direction perpendicular to the axial direction along the barrel portion. In the method of manufacturing a coil member, when the two molds forming the outer peripheral surface of the cylindrical body are formed in the separating direction of the two molds and the two molds are separated from each other A mold plane formed so as not to interfere with the cylindrical body portion of the coil member, and a plane portion on the outer peripheral surface of the cylindrical body portion by the mold planes of the two molds. Is formed.

  According to the above method for manufacturing a coil member, since it does not interfere with the cylindrical body forming the coil member when the mold is separated, even a coil member including a small coil bobbin used for a small motor is molded. When the object is released from the mold, the cylindrical body is not pushed into the inner peripheral side by the mold, and the joint location of the two molds on the outer peripheral surface of the cylindrical body Even if a joining portion (burr) is formed in the axial direction of the trunk portion along the line, it is possible to prevent the burr from coming into contact with the winding wound around the trunk portion in a circle.

  In the above coil member manufacturing method, the length of the mold plane in the joining direction of the mold is formed at the joint portion of the body portion formed along the joining location of the two molds. It is preferable that the length is set so as not to contact the inner peripheral surface of the circular winding wound along the outer peripheral surface of the cylindrical body with respect to the maximum protrusion amount of the burr. If set in this way, even if a joint (burr) is formed in the axial direction of the barrel along the joint location of two molds, the burr is wound around the barrel. It can be ensured that it does not come into contact with the wire.

  In the present invention, a space portion is provided between the outer peripheral surface of the cylindrical body portion in which the winding is wound circularly on the outer peripheral surface and the inner peripheral surface of the circular winding wound on the outer peripheral surface. A flat portion formed inside the outer peripheral surface so as to ensure that the two molds are not interfered with each other when the two molds are separated from each other. Since the joint portion on the body portion formed along the joint portion is positioned on the plane portion, even when a burr is formed along the joint portion, the joint portion is formed along the joint portion. Further, the burr can be formed so as not to come into contact with the winding wound in a circle around the body portion, and disconnection or damage due to the burr of the winding can be prevented.

  Next, a motor according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an example of a motor according to an embodiment of the present invention, and is a half sectional view of the entire motor. FIG. 2 is a partial cross-sectional view of the coil member taken along the line A-A 'shown in FIG. FIG. 3 is a side view of the coil member of the motor shown in FIG. FIG. 4 is a cross-sectional view schematically showing the body of the coil member in the closed state of the slide type. FIG. 5 is a cross-sectional view schematically showing a state in which the inner yoke is held by the slide mold and the upper mold is opened. FIG. 6 is a plan view schematically showing a state in which the slide mold is opened. FIG. 7 is an enlarged view showing a part around the parallel plane of the trunk in FIG.

(General configuration of motor)
As shown in FIG. 1, the motor 1 of this embodiment includes a rotor 5, a stator 4 disposed so as to surround the rotor 5, and a bracket 3 fixed to the output side end face of the stator 4.

  The rotor 5 includes a rotating shaft 21 and a rotor magnet 22 fixed to the outer periphery of the rotating shaft 21.

  The rotary shaft 21 is supported by an output-side bearing 32 held by a bracket 3 having a U-shaped cross section, one end of which is fixed to the stator 4, via a steel ball 31, and the other end is fixed to the stator 4. It is supported on the counter-output side bearing 33 held by the holding member 34 via a steel ball 31 '. The counter-output side bearing 33 is urged toward the output side of the rotary shaft 21 by an urging member 35 fixed to the bearing holding member 34. Therefore, the rotary shaft 21 is supported by the output side bearing 32 and the counter output side bearing 33 in a state of being urged by the urging member 35 in the direction of the output side bearing 32.

  The stator 4 includes a pair of stator core sets 41 and 41 ′ stacked in the axial direction of the rotating shaft 21. In the present embodiment, the stator 4 is formed in a two-layer structure, and a predetermined gap is arranged inside the stator 4. The rotor magnet 22 is rotatably arranged. Each stator core set 41, 41 ′ is arranged on the inner side in the axial direction of the outer yokes 44, 44 ′ as the stator cores arranged on the outer side in the axial direction in an overlapped state, and the flanges 431, 431. 'Inside yokes 43, 43' as stator cores that are superposed in a state where they are in contact with each other, arranged in spaces formed by outer yoke 44 and inner yoke 43, and outer yoke 44 'and inner yoke 43', respectively. Coil member 45 to be wound, and windings 46 and 46 ′ wound around the body portion of the coil member 45 in a circular shape.

  The inner yokes 43, 43 ′ have ring-shaped flange portions 431, 431 ′, and a plurality of poles that are bent from the inner peripheral edge of the ring-shaped flange portions 431, 431 ′ and are arranged to face the rotor magnet 22. The teeth 42, 42A are formed in a state of being arranged in the circumferential direction. The pole teeth 42, 42 </ b> A are erected substantially perpendicular to the flange portions 431, 431 ′.

  The outer yokes 44 and 44 ′ have ring-shaped flange portions 441 and 441 ′ similar to the inner yokes 43 and 43 ′, and are bent from the inner peripheral edge of the ring-shaped flange portions 441 and 441 ′. A plurality of pole teeth 42 ′ and 42 A ′ arranged to face the rotor magnet 22 are formed in a state of being arranged in the circumferential direction. The pole teeth 42 'and 42A' are vertically formed with respect to the flange portions 441 and 441 '. Further, the outer peripheral edges of the ring-shaped flange portions 441 and 441 'are bent so as to cover the outer periphery of the windings 46 and 46', and are formed as a motor case. That is, in this embodiment, the outer yokes 44 and 44 'also serve as a motor case.

  The windings 46 and 46 ′ are wound around the outer peripheral surface of the body portion 100 of the coil member 45 in a circular shape. In addition, in order to distinguish the trunk | drum which the winding 46 'is wound from the trunk | drum 100 in which the winding 46 is wound, it displays as the trunk | drum 100'. The coil member 45 is integrally formed with the inner yokes 43 and 43 ′ by insert molding as injection molding. In this embodiment, the terminal pin 6A is provided on the outer peripheral edge of the flange portions 431 and 431 ′ of the inner yokes 43 and 43 ′. A terminal block 6 having ˜6D is molded integrally. On the inner peripheral surface of the coil member 45, the pole teeth 42 of the inner yoke 43 and the pole teeth 42 ′ of the outer yoke 44 are arranged in the circumferential direction so as to alternately mesh with each other. Similarly, the pole teeth 42 A of the inner yoke 43 ′. And the pole teeth 42A ′ of the outer yoke 44 ′ are arranged in the circumferential direction so as to alternately mesh with each other. The “insert molding” in the present embodiment indicates a molding method in which a metal part is inserted into a mold so that the metal part and the resin are integrated.

(Configuration of coil member in this embodiment)
Next, the structure of the coil member 45 in this embodiment is demonstrated using FIG. 2, FIG. As shown in FIGS. 2 and 3, in this embodiment, the coil member 45 includes a cylindrical body portion 100, 100 ′ around which windings 46, 46 ′ are wound on the outer peripheral surface, and a body portion 100, 100 ′. Are molded by two molds 301 and 302 that move to the left and right in a direction orthogonal to the axial direction, and are cylindrical barrels 100 and 100 'as coil bobbins, and barrels 100 and 100. Ring-shaped flange portions 2 and 2 'as coil bobbins that protrude from both end portions in the axial direction of each of' and the pole teeth integrally formed by insert molding on the body portions 100 and 100 '. Inner yokes 43 and 43 'having 42 and 42A, and a terminal block 6 integrally formed on the outer peripheral edge of the flanges 431 and 431' of the inner yoke are provided.

  A joint 400 is formed on the outer peripheral surface of the body 100, 100 'in the axial direction along the joint of the slide molds 301, 302 including the two molds shown in FIG. The burr 120 is often formed at the joint 400, but the burr 120 is not necessarily formed from the beginning. Since the burr 120 is often formed by using the slide molds 301 and 302 including two molds for a long period of time, the number of times of use and the years of use of the mold are taken into consideration. The maximum protrusion amount of the burr 120 to be formed is predicted and set. The two molds 301 and 302 have a planar portion to be described later on the outer peripheral surfaces 102 and 102 ′ of the body portions 100 and 100 ′, and in this embodiment, mold planes 3011 and 3021 for forming the parallel plane 101. The mold planes 3011 and 3021 are formed when the two molds 301 and 302 are separated in the directions of arrows X and X ′ shown in FIG. In a region where “and” slide, the body portions 100 and 100 ′ are parallel to the separation direction (arrow X and X ′ directions) of the two slide dies 301 and 302 so that the body portions 100 and 100 ′ are not pushed into the two slide dies 301 and 302. The joint 400 formed at the joint of the two molds 301 and 302 is positioned on the parallel plane 101 formed on the outer peripheral surface of the barrels 100 and 100 ′. In this embodiment, a pair of parallel planes 101 are formed at two points that are point-symmetric with respect to the centers of the trunk portions 100 and 100 ′ in a direction (radial direction) orthogonal to the axial direction. Therefore, a pair of mold planes 3011 and 3021 formed on the two molds 301 and 302 are also formed in the same manner. As shown in FIG. 3, the joint 400 is located at the approximate center in the direction in which the two slide molds 301 and 302 on the parallel plane 101 are separated.

  Further, in this embodiment, the parallel plane 101 on which the joint portion 400 is located separates the slide molds 301 and 302 when the slide molds 301 and 302 are separated in the directions of the arrows X and X ′ as shown in FIG. The lengths of the widths Y and Y ′ of the parallel plane 101 in the direction are equal. In order to make the widths Y and Y 'of the parallel plane 101 equal, the lengths of the mold planes 3011 and 3021 formed on the two molds 301 and 302 may be set to be the same. The parallel plane 101 may be formed so that the widths Y and Y ′ have different lengths. The joint portion 400 is formed along the joint portion between the two slide molds 301 and 302. That is, as shown in FIG. 3, the joint portion 400 includes a flange portion 2 formed on the upper end surface (upper side of FIG. 3) of the trunk portion 100 and a flange portion 2 formed on the lower end surface of the barrel portion 100 (FIG. The lower end surface of the flange portion 2 ′ and the trunk portion 100 ′ formed on the upper end surface (the upper side of FIG. 3) of the trunk portion 100 ′ It is formed in all regions in the axial direction of the trunk portion 100 ′ sandwiched by the flange portion 2 ′ formed on the lower side of FIG. 3.

  Similarly to the joint portion 400, the parallel plane 101 also has a flange portion 2 formed on the upper end surface (upper side in FIG. 3) of the body portion 100 and a flange portion 2 formed on the lower end surface of the body portion 100, as shown in FIG. 3. Under the flange portion 2 and the trunk portion 100 ′ formed on the entire axial region of the trunk portion 100 sandwiched between (the lower side in FIG. 3) and the upper end surface (upper side in FIG. 3) of the trunk portion 100 ′. It is formed in all the regions in the axial direction of the trunk portion 100 ′ sandwiched between the flange portions 2 formed on the end surface (the lower side of FIG. 3). Furthermore, the length of the width Y, Y ′ of the parallel plane 101 (see FIG. 4) is such that when the burr 120 is formed along the joint 400, the burr 120 is wound around the body 100, 100 ′ in a circle. It is formed in a length that does not contact the windings 46, 46 '. That is, when the windings 46, 46 ′ are wound around the outer peripheral surfaces 102, 102 ′ of the trunk portions 100, 100 ′ in a circle, the inner surfaces of the circular windings 46, 46 ′ are between the parallel plane 101. A space 130 (see FIG. 7) is formed. In other words, the windings 46, 46 ′ are wound so that a space 130 (see FIG. 7) is formed between the inner peripheral surface of the circular windings 46, 46 ′ and the parallel plane 101. In this case, the radial position of the windings 46, 46 ′ in the innermost peripheral portion and the radial position of the parallel plane 101 where the joint 400 is located are determined in advance by determining the widths Y, Y ′ of the parallel plane 101. Therefore, considering the size of the burr 120 expected to be formed along the joint 400, the widths Y and Y ′ of the parallel plane 101 are set so that the tip of the burr 120 does not contact the windings 46 and 46 ′. That is, the lengths of the mold planes 3011 and 3021 formed on the molds 301 and 302 are set. In addition, if the widths Y and Y ′ of the parallel plane 101 are too long, the radial positions of the windings 46 and 46 ′ in the innermost peripheral portion are closer to the inner side than on the original circumference. If 46 'is a range which does not contact the burr | flash which generate | occur | produces along the junction part 400, the width Y and Y' should be small.

  A plurality of cutout portions 54 are formed on the outer peripheral surface of the body portions 100 and 100 ′. The notch 54 is a notch that communicates with the outer peripheral surfaces of the pole teeth 42 and 42A of the inner yokes 43 and 43 '. In this embodiment, in the manufacturing process of the coil member 45, the slide molds 301 and 302 are provided with the pole teeth 42 and 42A of the inner yokes 43 and 43 ′ that are insert-molded on the inner wall side of the trunk portions 100 and 100 ′. , 302 is formed with a tilt-preventing projection (not shown) in order to prevent it from falling to the outer peripheral side due to a load caused by resin filling. Therefore, the notch 54 is formed by filling the resin in a state where the protrusion for preventing tilting is in contact with the outer peripheral surface of the pole teeth 42 and 42A. In addition, it is preferable that the protrusions for preventing tilting are formed so as to abut on all the pole teeth 42 and 42A. In this case, the notch 54 is formed on the outer peripheral surface of all the pole teeth 42 and 42A. .

  The pole teeth 42 and 42A of the inner yokes 43 and 43 ′ are formed integrally with the trunk portion 100 and 100 ′, and the pole teeth 42 and 42A of the inner yokes 43 and 43 ′ are the inner wall side of the trunk portions 100 and 100 ′. It is insert molded. In this embodiment, a protrusion for preventing tilting comes into contact with the outer peripheral surfaces of the pole teeth 42 and 42A, and a center auxiliary portion 304a of a lower mold 304 described later comes into contact with the inner peripheral surface of the pole teeth 42 and 42A. Since the resin is filled with the 42 and 42A sandwiched, the pole teeth 42 and 42A can be prevented from tilting in the radial direction due to the pressure of the filled resin. Further, since the inner peripheral surfaces of the pole teeth 42 and 42A are in contact with the central auxiliary portion 304a of the lower die 304 and are filled with resin, the pole teeth 42 and 42A are excluded except for the portions where the tilt prevention protrusions are disposed. The outer peripheral surface and the side surface are covered with resin and are insert-molded on the inner wall side in a state of being embedded in the trunk portions 100 and 100 ′. On the other hand, the inner peripheral surfaces of the pole teeth 42 and 42A are not embedded in the trunk portions 100 and 100 ', but are exposed from the inner peripheral surfaces of the trunk portions 100 and 100'. Accordingly, the inner peripheral surfaces of the pole teeth 42 and 42A are opposed to the rotor magnet 22 without the resin (body portions 100 and 100 ') interposed therebetween. Of the plurality of pole teeth 42, 42 </ b> A, the pole teeth 420 are formed at positions that overlap the joint 400 in the radial direction.

  Further, pole tooth insertion holes 47 into which the pole teeth 42 'and 42A' of the outer yokes 44 and 44 'are inserted are formed on the inner wall side of the body parts 100 and 100'. The pole tooth insertion hole 47 is a recess that is recessed in the radial direction from the inner wall side, and one of the holes is open to the outer flange portions 2, 2 ′ side. Accordingly, when the pole teeth 42 'and 42A' of the outer yokes 44 and 44 'are inserted from the outside in the axial direction of the flange portions 2 and 2', the pole teeth 42 and 42A of the adjacent inner yokes 43 and 43 'are the same. As described above, the outer peripheral surfaces and side surfaces of the pole teeth 42 ′ and 42 A ′ are formed so as to be covered with resin, but the inner peripheral surfaces of the pole teeth 42 ′ and 42 A ′ are formed from the inner peripheral surfaces of the trunk portions 100 and 100 ′. It is formed so as to face the rotor magnet 22 without being exposed and passing through the resin (body portions 100, 100 ′).

  In the case of this embodiment, a winding portion is formed in a space in which a pair of flange portions 2 and 2 formed on the upper end surface of the body portion 100 and the lower end surface of the body portion 100 on the flange portion 431 of the inner yoke 43 are opposed to each other. 45A, and a pair of flange portions 2 ′ and 2 ′ formed on the upper end surface of the trunk portion 100 ′ and the lower end surface of the trunk portion 100 ′, which are below the flange portion 431 ′ of the inner yoke 43 ′, are opposed to each other. The space formed in this manner is formed as a winding part 45B.

  The winding portion 45A is isolated from the flange portion 431 of the inner yoke 43 and the flange portion 441 of the outer yoke 44 by the flange portions 2 and 2, and the outer teeth of the pole teeth 42 and 42 'of the inner yoke 43 and the outer yoke 44 are separated from each other. Since it is isolated by the body portion 100 formed so as to be covered with resin, the winding 46 wound around the winding portion 45 </ b> A can ensure sufficient insulation between the inner yoke 43 and the outer yoke 44. The winding portion 45B is isolated from the flange portion 431 ′ of the inner yoke 43 ′ and the flange portion 441 ′ of the outer yoke 44 ′ by the flange portions 2 ′ and 2 ′, and the poles of the inner yoke 43 ′ and the outer yoke 44 ′. Since the teeth 42A and 42A ′ are isolated by the body portion 100 ′ formed so that the outer peripheral surface thereof is covered with resin, the winding 46 ′ wound around the winding portion 45B is formed by the inner yoke 43 ′ and the outer yoke. A sufficient insulation state can be ensured with 44 '.

  The terminal block 6 is integrally formed by insert molding on the outer peripheral edge of the flange portions 431 and 431 ′ of the inner yokes 43 and 43 ′, and the four terminal pins 6A, 6B, 6C, and 6D protrude in the radial direction. Each terminal pin 6A, 6B, 6C, 6D is wound around the ends of the windings 46, 46 '. Further, in this embodiment, the terminal block 6 is formed integrally with the flange portion 2 formed on the lower end surface of the body portion 100 shown in FIG. 3 and the flange portion 2 ′ formed on the upper end surface of the body portion 100 ′. Yes.

(Mold used for manufacturing coil member in this embodiment)
Next, molds 301 to 304 as molds used for manufacturing the coil member 45 will be described.

  As shown in FIGS. 4 and 5, molds 301 to 304 as molds include an upper mold 303, a pair of left and right slide molds 301 and 302, and a lower mold 304. The molds 301 to 304 are provided with a plurality of units arranged in parallel when the upper mold 303 and the pair of left and right slide molds 301 and 302 and the lower mold 304 are formed as one unit. In addition to the slide molds 301 and 302, the lower mold 304 has another slide mold (not shown) for forming the terminal block 6.

  As shown in FIG. 4, arrows X and X ′ indicate the separation direction when the slide dies 301 and 302 are separated from the molded product (coil member 45), and are mold planes for forming the parallel plane 101. Since 3011 and 3021 are formed in parallel to the separation direction of the two slide molds 301 and 302, when the slide molds 301 and 302 are separated, the slide molds 301 and 302 and the body portions 100 and 100 ′ slide. The parallel plane 101, which is the entire region that moves, does not interfere with the slide molds 301 and 302. A pair of parallel planes 101 are formed at point-symmetrical positions with respect to the centers of the trunk portions 100 and 100 '.

  As shown in FIG. 5, the upper mold 303 is a lid-shaped mold that closes the upper surface of the cavity, which is a space into which the synthetic resin formed by closing the lower mold 304 and the slide molds 301 and 302 flows, and moves up and down. It is provided as possible. Further, a central auxiliary portion 304a is formed on the upper surface of the lower die 304 so as to project the inner side of the pole teeth 42 and 42A of the inner yokes 43 and 43 'of the coil member 45. In other words, the central auxiliary portion 304a is inserted into the inner yokes 43 and 43 'of the coil member 45, and forms the inner wall surfaces of the trunk portions 100 and 100'.

  The pair of left and right slide molds 301 and 302 is for forming an outer surface including the outer peripheral surface of the body portions 100 and 100 ′ of the coil member 45 for constituting the winding portions 45A and 45B. It is provided on 304 so as to be opened and closed in the directions of arrows X and X ′ shown in FIG. In addition, on the inner surface of the slide molds 301 and 302, there are three grooves arranged in order from bottom to top, that is, a first groove 302a (1) which is a lowermost groove and a second groove which is a central groove. 302a (2) is provided with a third groove 302a (3) which is the uppermost groove. In order to form the terminal block 6, a slide mold (not shown) provided separately from the slide molds 301 and 302 is provided so as to be able to open and close in a direction perpendicular to the directions of the arrows X and X ′. .

  As shown in FIG. 5, the central groove 302a (2) has a semicircular arc cavity formed by opposing surfaces facing each other in the axial direction. The cavity of the lowermost first groove 302a (1) is formed by the lower mold 304 and the slide molds 301 and 302, and the cavity of the uppermost third groove 302a (3) is the upper mold 303. And the slide molds 301 and 302.

  In particular, in the second groove 302a (2) in the central portion, a holding portion 302b is formed outside the cavity to hold the outer peripheral edges of both flange portions 431 and 431 ′ of the superposed inner yokes 43 and 43 ′. It is like that. Therefore, the cavity of the second groove 302a (2) is formed inside the holding portion 302b as a semi-arc-shaped space into which synthetic resin flows on both the front and back surfaces of the flange portions of the inner yokes 43 and 43 ′. .

(Manufacturing method of coil member in this embodiment)
Next, the manufacturing method of the coil member 45 using the metal mold | die 301-304 as a shaping | molding die is demonstrated.

  First, as shown in FIG. 6, when the slide molds 301 and 302 are opened, the position holding means (not shown) is used to have the two terminal pins 6 </ b> B and 6 </ b> D, the pole teeth 42 and the pole teeth 42. The inner yoke 43 including the portion 431 is held in a horizontal state. Here, the inner yoke 43 and the terminal pins 6 </ b> B and 6 </ b> D are configured to be connected by the connecting member 40 using a single plate 401. The inner yoke 43 ′ is also made of a single plate having the same shape as the inner yoke 43. By holding the inner yoke 43 in the opposite direction, the downward pole teeth 42A can be obtained, Two terminal pins 6A and 6C can be arranged.

  The inner yoke 43 connected to the plate 401 has the pole teeth 42 facing upward on the paper surface, and the inner yoke 43 ′ (not shown) has the pole teeth 42A facing downward, and the flanges 431 of each other. , 431 ′ are integrated by spot welding or laser welding. The integrated inner yokes 43 and 43 'are held in a position in the axial direction using a position holding means (not shown). In this state, the central auxiliary portion 304a is inserted in the inner peripheral edges of the inner yokes 43 and 43 'as shown in FIG. In this state, the flanges 431 and 431 ′ of the inner yokes 43 and 43 ′ are, as shown in FIG. 5, the second groove 302a ( Face 2) and get into the inside. Further, as shown in FIG. 5, the upper mold 303 is also moved upward with respect to the slide molds 301 and 302 so as to be opened.

  Next, the slide molds 301 and 302 are closed by moving in the direction opposite to the directions of the arrows X and X 'shown in FIG. The slide molds 301 and 302 are formed with mold planes 3011 and 3021 that are parallel to the arrows X and X ′ that are the separation directions of the slide molds 301 and 302. Note that a slide type (not shown) for forming the terminal block 6 is also closed from the direction orthogonal to the X and X ′ directions. As a result, the flanges 431 and 431 ′ of the inner yokes 43 and 43 ′ and the four terminals 6 </ b> A, 6 </ b> B, 6 </ b> C, and 6 </ b> D are clamped with respect to the slide molds 301 and 302. The position holding means (not shown) slides so that the inner yokes 43, 43 ′ and the four terminal pins 6A, 6B, 6C, and 6D are interchanged when held by the slide molds 301, 302 and the like. Moved out of the mold 301, 302, etc.

  At this time, the slide molds 301 and 302 allow the flanges 431 and 431 ′ of the inner yokes 43 and 43 ′ to enter, and the flanges 431 and 431 ′ are positioned between the holding portions 302b shown in FIG. Hold. That is, the flanges 431 and 431 ′ of the inner yokes 43 and 43 ′ enter the second groove 302 a (2), the outer peripheral edge thereof is held by the holding part 302 b, and the inner side of the outer peripheral edge is a semicircular arc-shaped cavity Located in.

  Next, the upper mold 303 is closed. As a result, the upper surface opening of the cavity is closed together with the slide molds 301 and 302, and the cavity for pouring the molten synthetic resin into the mold is formed in a completely closed state.

  Thereafter, synthetic resin is injected into the cavity through a gate (not shown). Using the synthetic resin as a combined body, the inner yokes 43, 43 'and the four terminals 6A, 6B, 6C, and 6D are integrated. That is, between the pole teeth 42 and 42A and the outer peripheral surfaces of the pole teeth 42 and 42A in the inner yokes 43 and 43 ′ are completely filled and surrounded by the synthetic resin, so that the trunk portions 100 and 100 ′ are formed. It is formed. In addition, since the synthetic resin enters the semicircular arc-shaped cavities of the grooves 302a, the flange portions 431 and 431 ′ are covered with the synthetic resin, and the flange portions 2, 2 and 2 ', 2' are formed. In addition, a parallel plane 101 is formed in a portion corresponding to the mold planes 3011 and 3021.

  Further, after the synthetic resin injected into the cavity is cured, the upper mold 303 is opened and the slide molds 301 and 302 are opened in the reverse order to that when the mold is closed.

  When the molded product is released from the molds 301 to 304, the coil member 45 connected by the connecting member 40 is formed in the plate set. Finally, the coil member 45 is separated from the plate set, and the coil member 45 as a single member is formed. At this time, in order to perform the cutting operation of the coupling portion 402 provided for coupling the plate 401 and the coil member 45, it is preferable to form the alignment portion 50 shown in FIG.

  Windings 46 and 46 ′ are wound around the trunk portions 100 and 100 ′ of the coil member 45 formed as described above, and the windings 46 and 46 ′ are along the outer peripheral surface of the trunk portions 100 and 100 ′. The innermost windings 46 and 46 ′ are also wound in a circle along the outer peripheral surface of the trunk portion 100 and 100 ′, and the parallel plane 101 and the innermost windings 46 and 46 ′ are wound. A space 130 (see FIG. 7) corresponding to the circumferential length of the parallel plane 101 is formed between the two. Therefore, according to the present embodiment, even when the burr 120 is formed along the joint 400 as shown in FIG. 7, it is between the parallel plane 101 and the innermost windings 46, 46 ′. Since the space 130 is formed, the burr 120 can be accommodated in the space 130 by appropriately setting the lengths of the widths Y and Y ′ of the parallel plane 101, and the burr 120 is the innermost. It is possible to avoid contact with the circumferential windings 46, 46 ′.

(Effect of embodiment)
As described above, in the coil member 45 of this embodiment, the joint portion 400 is formed along the axial direction on the outer peripheral surface of the body portions 100 and 100 ′. The joint portion 400 includes the slide molds 301 and 302. When separating, the body parts 100 and 100 ′ are positioned on a parallel plane 101 formed in parallel with the separating direction of the slide molds 301 and 302 so as not to interfere with the slide molds 301 and 302. With such a configuration, it is possible to prevent the coil member 45 from being damaged by the mold when the coil member 45 is released from the slide molds 301 and 302.

  Further, the parallel plane 101 is formed so as to be in a positional relationship parallel to the directions of the arrows X and X ′ in FIG. 2, and the joining portion 400 has separation widths Y and Y in the direction in which the slide molds 301 and 302 are separated from each other. 'Is set to the same length. With such a configuration, the separation distance from the burr formed on the parallel plane 101 to the winding can be increased. Therefore, it is possible to prevent wire breakage and damage due to burrs more reliably.

  Further, the parallel plane 101 is formed at a point target position in a direction orthogonal to the axial direction, and the joint portion 400 is formed on the parallel plane 101. With such a configuration, it is possible to prevent breakage or damage of the winding due to burrs continuously formed between one end surface portion and the other end surface portion of the coil member.

  Further, since the joint portion 400 is formed at the approximate center in the direction in which the slide molds 301 and 302 of the parallel plane 101 are separated from each other, even if the burr 120 is generated along the joint portion 400, the joint portion 400 is joined. Compared to the case where the portion 400 is formed to be biased to one side of the parallel plane 101, the distance from the tip of the burr 120 to the windings 46, 46 ′ can be increased.

  Further, even when the pole teeth 42 and 42A of the inner yokes 43 and 43 ′ integrally formed on the inner side of the trunk portion 100 are arranged on the radially inner side of the joint portion 400 (see the pole teeth 420 in FIG. 2). Since the slide molds 301 and 302 are moved 180 ° reverse in the X and X ′ directions to release the coil member 45, the slide molds 301 and 302 do not push the pole teeth 42 and 42 ′ inward. The pole teeth 42, 42 ′ can be arranged along the joint 400. Therefore, the pole teeth can be formed so as to overlap the burr and the direction orthogonal to the axial direction, and the degree of freedom in designing the arrangement of the pole teeth is improved.

(Other embodiments)
In the above-described embodiment, the mold planes 3011 and 3021 are separated from the two slide molds 301 and 302 and the body 100 when the two molds 301 and 302 are separated in the directions of arrows X and X ′ shown in FIG. , 100 ′, the two slide molds 301, 302 are formed on the outer peripheral surface of the body parts 100, 100 ′ so that the body parts 100, 100 ′ are not pushed by the two slide molds 301, 302. The parallel plane 101 formed in parallel with the separation direction (arrow X, X ′ direction) is formed. However, since it is only necessary that the body portions 100 and 100 ′ are not pushed by the two slide molds 301 and 302, the plane portions formed on the outer peripheral surfaces 102 and 102 ′ of the body portions 100 and 100 ′ are 2 pieces. It does not have to be parallel to the direction in which the two slide molds 301 and 302 are separated (in the directions of arrows X and X ′), and is inclined so that the joint between the two slide molds 301 and 302 is located slightly outside the parallel plane 101. May be formed.

  Further, the coil member 45 is not necessarily formed integrally with the inner yoke 43 ′, and the cylindrical body portion 100 around which the winding 46 is wound around the outer peripheral surface and the axial direction from both ends of the body portion 100 in the circumferential direction. A ring-shaped flange portion 2 projecting over the entire circumference, an inner yoke 43 having pole teeth 42 integrally formed on the body portion 100 by insert molding, and a terminal block on the outer peripheral edge of the flange portion 431 of the inner yoke 6 may be constituted by being integrally formed. Further, the inner yoke 43 having the pole teeth 42 may be configured as a member different from the coil member 45, and may not be integrally formed with the trunk portion 100 by insert molding. In this case, the coil member 45 is formed as a simple coil bobbin.

  The coil member 45 described above is molded using the slide molds 301 and 302, the upper mold 303, and the lower mold 304, but the configuration of the mold for molding the coil member 45 is not limited to this. For example, the mold for forming the slide direction is configured using two slide molds 301 and 302, but the coil member 45 may be formed using a mold for forming three or more slide directions. As for the upper mold 303, the upper mold 303 is configured as one mold in the present embodiment, but the coil member 45 may be molded using two or more molds that mold in the upward direction. .

  Although the above embodiment has been described using a stepping motor, the present invention is applicable to all motors that can use coil members in addition to stepping motors (for example, HB motors, brushless DC motors, etc.). is there.

1 shows an example of a motor according to an embodiment of the present invention, and is a half sectional view of the entire motor. FIG. 4 is a partial cross-sectional view showing an example of a coil member according to an embodiment of the present invention, with a part of the coil member taken along the line A-A ′ shown in FIG. FIG. 2 is a side view of the coil member of the motor shown in FIG. 1, showing an example of the coil member according to the embodiment of the present invention. It is a cross-sectional view which shows an example of the shaping | molding method by the metal mold | die of the coil member which concerns on one Embodiment of this invention, and shows typically the trunk | drum of the coil member in the closed state of a slide type | mold. It is sectional drawing which shows an example of the shaping | molding method by the metal mold | die of the coil member which concerns on one Embodiment of this invention, and shows the state in which the inner yoke was hold | maintained at the slide mold | type and the upper mold | type opened. It is a top view which shows an example of the shaping | molding method by the metal mold | die of the coil member which concerns on one Embodiment of this invention, and shows the state which the slide mold | type opened. It is an enlarged view which shows an example of the coil member which concerns on one Embodiment of this invention, and expands and shows a part of parallel plane part periphery of the trunk | drum in FIG. An example of a conventional coil member is shown, and a part of a plane of a body portion of the coil member is enlarged. It is a schematic diagram which shows an example of the conventional coil member, and shows the state which injection-molds the coil member shown in FIG. 8 with a metal mold | die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 5 Rotor 3 Bracket 4 Stator 6 Terminal block 21 Rotating shaft 31, 31 'Steel ball 32 Output side bearing 33 Counter output side bearing 34 Bearing holding member 35 Energizing member 41, 41' Stator core assembly 42, 42 'Polar teeth 42A , 42A ′ pole teeth 43, 43 ′ inner yoke 44, 44 ′ outer yoke 45A, 45B winding part 46, 46 ′ winding 54 notch part 100, 100 ′ trunk part 101 parallel plane 101 ′ plane forming part 120 burr
130 Space part 301, 302 Slide mold 303 Upper mold 304 Lower mold 400 Joining part

Claims (18)

In a coil member that is injection-molded by two molds in which a cylindrical body portion in which a winding is wound in a circular shape on an outer peripheral surface moves left and right in a direction orthogonal to the axial direction along the body portion,
The outer peripheral surface is formed on the inner side of the outer peripheral surface so as to ensure a space between the inner peripheral surface of the circular winding wound around the outer peripheral surface and the two molds are provided. A flat portion formed so as not to interfere with the two molds when being separated;
A coil member, wherein a joint portion on the body portion formed along a joint portion of the two molds is positioned on the flat portion.   2. The coil member according to claim 1, wherein the planar portion is a parallel planar portion formed in parallel with a separation direction of the two molds.   2. The length in the circumferential direction of the flat portion according to claim 1, wherein the burr formed in the joint portion is wound in a circle along the outer peripheral surface of the cylindrical body portion. A coil member characterized by being set to a length that does not contact the surface. In Claim 3, the said trunk | drum is formed with a pair of ring-shaped flange parts each projecting in the radial direction from both ends in the axial direction,
The space formed by the pair of flange portions facing each other is used as a winding portion in which the winding is wound in a circular shape, and in all axial regions of the trunk portion sandwiched between the flange portions. The coil member, wherein the planar portion is formed.   4. The coil member according to claim 3, wherein the two planar portions facing each other across the center of the cylindrical body portion are formed on the outer peripheral surface of the cylindrical body portion.   The coil member according to claim 1, wherein a stator core having pole teeth is integrally formed on the body portion by insert molding as injection molding.   The coil member according to claim 6, wherein an inner peripheral surface of the pole tooth is exposed from an inner peripheral surface of the trunk portion.   The coil member according to claim 7, wherein the pole teeth are formed so as to overlap with the joint portion in a radial direction.   2. The coil member according to claim 1, wherein the joining portion is formed on the flat portion at a substantially center in a direction in which the two molds are separated from each other.   2. The coil member according to claim 1, wherein at least one pair of the flat portions is formed at point-symmetrical positions with respect to the center of the body portion in a direction orthogonal to the axial direction. A stator having a stator set in which a winding is wound in a circular shape on the outer peripheral surface of a cylindrical body portion of a coil member, and a rotor having a rotor magnet disposed on the inner periphery side of the body portion. In the motor
The coil member is configured to be injection-molded by two molds that move to the left and right in a direction orthogonal to the axial direction along the cylindrical body portion,
The outer peripheral surface of the cylindrical body is formed on the inner side of the outer peripheral surface so that a space is secured between the outer peripheral surface and the inner peripheral surface of a circular winding wound around the outer peripheral surface. And a flat portion formed so as not to interfere with the two molds when the two molds are separated from each other,
A joint portion on the body portion formed along the joint portion of the two molds is positioned on the plane portion;
The motor according to claim 1, wherein a burr at a joint portion on the body portion formed on the flat portion is not in contact with an inner peripheral surface of the circular winding. 12. The stator according to claim 11, wherein the stator includes an inner yoke in which pole teeth are integrally formed by insert molding on the inner wall side of the barrel portion, and an outer portion in which the pole teeth are inserted in a concave portion that is radially recessed from the inner wall side of the barrel portion. With a yoke,
The motor according to claim 1, wherein the pole teeth of the inner yoke and the pole teeth of the outer yoke are arranged so as to alternately mesh with each other in the axial direction on the inner wall side of the body portion.   In Claim 12, the pole teeth of the inner yoke and the pole teeth of the outer yoke are arranged to face the rotor magnet in a state where the inner peripheral surface of the pole teeth is exposed from the inner wall side of the body portion. A motor characterized by   14. The motor according to claim 13, wherein the pole teeth of the inner yoke and the pole teeth of the outer yoke are covered with the body portion on the outer peripheral surface and side surfaces.   In Claim 11, the length about the peripheral direction of the above-mentioned plane part is the circle wound along the above-mentioned peripheral surface of the above-mentioned cylindrical body part with respect to the maximum projection amount of the burr formed in the above-mentioned joined part. A motor characterized in that the length is set so as not to contact the inner peripheral surface of the winding. The coil member according to claim 15, wherein the coil member has a ring-shaped flange portion that is formed to project from the both ends in the axial direction of the trunk portion to the entire circumference in the circumferential direction.
The space formed by the outer peripheral surface of the body portion and the pair of flange portions facing each other is used as a winding portion for winding the winding in a circular shape, and all the axial directions of the body portion sandwiched between the flange portions The motor is characterized in that the planar portion is formed in the region. A coil member formed by injection molding with two molds in which a cylindrical body portion in which a winding is wound in a circular shape on an outer peripheral surface moves left and right in a direction orthogonal to the axial direction along the body portion In the manufacturing method of
The two molds forming the outer peripheral surface of the cylindrical body portion are formed in the separating direction of the two molds and the cylindrical shape of the coil member when separating the two molds. A mold plane formed so as not to interfere with the body portion of the
A method of manufacturing a coil member, wherein a planar portion is formed on the outer peripheral surface of the cylindrical body portion by the mold planes of the two molds.   18. The length of the burr formed on the joint part on the body part formed along the joining part of the two molds is the length of the mold plane in the joining direction of the molds. A method for producing a coil member, characterized in that the length is set so as not to contact the inner peripheral surface of a circular winding wound along the outer peripheral surface of the cylindrical body portion with respect to the amount. .

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