JP5033320B2 - Method for manufacturing stator of electric motor - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine and a method for manufacturing the same.

    Conventionally, as a stator of this type of rotating electrical machine, as shown in FIG. 9, a large number of small teeth (tooth portions) are arranged inside the yoke portion 101 along the circumferential direction at a constant interval toward the center. The stator core 100 is formed by projecting 102, and a stator winding (not shown) is inserted from the inner diameter side of the stator core 100 into a slot 103 formed between the small teeth. In general, a stator formed by the above method is used.

However, in the case of such a conventional rotating electric machine stator, in the method of inserting a winding from the inner diameter side of the small tooth portion 102 (inserter), the opening of the small tooth portion 102 is relaxed in order to reduce the insertion force of the winding. Excitation loss increases because the part must be widened, and the winding circumference needs to be increased in order to reduce the insertion force. Therefore, the winding resistance increases and the primary copper loss increases. End up. As a result, the motor characteristics have been greatly reduced.
Moreover, in the case of the method of winding the winding directly around the small tooth portion, the workability is deteriorated and the space factor is also lowered, so that the electric motor characteristics are greatly deteriorated.

  Therefore, as shown in FIG. 10, a method is known in which the yoke portion 201 and the small tooth portion 202 are divided and manufactured, and after winding, the stator core of the rotating electrical machine is manufactured by combining them together ( Patent Document 1). Then, as a method of connecting the small tooth portions 202 and 202 ', a powdered magnetic body is sintered and formed, and a non-magnetic body 203 formed in a substantially H shape is formed integrally with the slot. A method of closing the air gap side 204 is used.

Further, as a method of connecting the small tooth portions, a method of integrating the small tooth portions with an insulating material such as a resin in a state where the small tooth portions are arranged in an annular shape is known (see Patent Document 2).
JP 58-190245 A JP-A-3-235629

  However, in the method of Patent Document 1, the method of connecting the small teeth 202, 202 ′ of the stator core is limited to a method of sintering a powdered magnetic body, and is formed by stacking punched iron plates. There is a problem that it cannot be used for the stator of the manufacturing method. Furthermore, when implementing the method of patent document 1, it cannot be said that the manufacturing method which sinters and forms a powdery magnetic body can be implemented easily, and it was not practical after all.

  Further, in the method of Patent Document 2, since the resin is injected and integrated, the small tooth portion must be positioned in the mold of resin molding, and it seems that molding is difficult. In Patent Document 2, since a specific method for positioning the small tooth portion is not described, it is estimated that it is actually difficult to realize.

The present invention solves the above-mentioned problems and fixes the stator small teeth with a non-magnetic stator cover that maintains both the inner diameter position and the insulation performance, thereby greatly increasing the opening width of the stator small teeth. An object of the present invention is to provide a method of manufacturing a stator for an electric motor that can be reduced in size and shortened in circumference.

In order to solve the above problems, the present invention provides a method of manufacturing a stator of a distributed winding motor, wherein small teeth are arranged at regular intervals around a disk-shaped small tooth temporary fixing jig, and the disk Convex portions are formed at regular intervals around the temporary tooth fixing jig, and a concave portion that matches the convex portion is formed on the inner diameter side end surface of the small tooth portion, and the concave portion of the small tooth portion is formed on the small tooth portion. In combination with the convex part of the tooth part temporary fixing jig, the small tooth parts are radially arranged at regular intervals around the small tooth part temporary fixing jig, and radially extended from the annular part and the annular part, positioning radially said by a pair of stator cover the teeth part is covered from both sides of the pair of stator cover the teeth portion of the non-magnetic material having a housing portion for holding the respective teeth portions from both sides in the axial direction and, formed by inter-teeth portions mutually are arranged to be positioned radially by the stator cover The slot, the previously wound winding coil, is inserted through the opening in the centrifugal direction of the stator outer diameter side placed to ensure insulation, the annular outer peripheral side of the housing portion of the stator cover assembling the yoke portion is to produce a stator closing the opening of the outer diameter side and integrated with the teeth portion and the yoke portion.

In the stator of the present invention, the yoke portion and the small tooth portion of the stator are separately manufactured, and the small tooth portion of the stator is fixed using a non-magnetic stator cover that maintains both the inner diameter position and the insulation performance. Therefore, the arrangement of the small teeth portion is easy, and the winding can be inserted into the stator small teeth slot held by the stator cover from the outer peripheral side, so that the assembling work can be easily performed. .
Further, according to the method for manufacturing a stator of the present invention, the yoke portion and the small tooth portion of the stator are separately manufactured, and the small tooth portion of the stator is a non-magnetic material that has both the inner diameter position holding and the insulation performance. After fixing the stator cover and the small tooth part temporary fixing jig together and inserting the winding coil that constitutes the stator winding from the yoke part side, the yoke part and the small tooth part are integrated. Since it forms, arrangement | positioning of a small tooth part becomes easy.
In the stator manufacturing method of the present invention, since the winding wound beforehand on the winding frame or the like can be put into the slots between the stator small teeth held by the stator cover, A stator can be manufactured without applying mechanical stress to the winding while shortening the opening width and winding circumference.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual diagram showing the stator of the present invention. 2 to 8 are views for explaining a method of manufacturing a stator according to the present invention.

In FIG. 1, the stator 10 stores and holds a large number of small teeth portions 12 arranged at predetermined intervals in the circumferential direction in a storage portion 13 a of a pair of non-magnetic stator covers 13. The stator core 11 is configured by fitting and mounting an annular yoke portion 14 on the outer peripheral side of the thirteen storage portions 13a. A winding coil 16 constituting a stator winding is disposed in a slot 15 formed between the small tooth portions 12 of the stator core 11.
The pair of stator covers 13 are formed of a non-magnetic material having insulation performance, and the storage portions 13a extend radially from the annular portion 13b on the inner peripheral side at regular intervals in the circumferential direction. It is.
The pair of stator covers 13 form a storage portion 13a that constitutes a tubular portion by matching each other on the opposing surfaces, and by combining the stator cover 13, a small tooth portion between the storage portions 13a. 12 is stored and held.

  FIGS. 2 and 3 are obtained by punching and stacking the yoke portion 14 and the small tooth portion 12 constituting the stator core 11 of the stator 10 by pressing. The yoke portion 14 is a laminated steel plate formed in an annular shape, and concave portions 14a that engage the outer diameter side of the small teeth portion 12 are formed at regular intervals on the inner peripheral side. The small tooth portion 12 is a laminated steel plate in which thin plates punched in a strip shape are laminated, and an enlarged portion 12a that is expanded in the circumferential direction is provided at the inner diameter side tip, and a concave portion 12b is formed on the inner diameter side of the enlarged portion 12a. Has been.

  4 and 5 show a disk-shaped small tooth part temporary fixing jig 20, which is a jig for forming a stator having a predetermined diameter. is there. The small tooth temporary fixing jig 20 is provided with small protrusions 20a projecting from the circumferential surface at a predetermined interval along the circumferential direction toward the centrifugal direction. The concave portion 12b is engaged with the protruding portion 20a of the small tooth portion temporary fixing jig 20, and the small tooth portions 12 are arranged radially around the small tooth portion temporary fixing jig 20 (see FIG. 6).

  FIG. 7 shows the stator cover 13 that covers the small tooth portion 12 arranged around the small tooth portion temporary fixing jig 20, and this stator cover 13 is radially formed around the annular portion 13b having a predetermined diameter. The storage portion 13a is extended. The pair of stator covers 13 are combined with each other from the axial direction, that is, from the top and bottom of the small tooth portion 12 to form a rectangular tube-shaped storage portion 13a. The side is covered and insulated from the surroundings (see FIG. 8). In this state, the winding coil 16 constituting the stator winding previously wound around the winding frame is inserted into the slot 15 formed by the radial small teeth 12 from the opening on the outer diameter side of the stator cover 13. Insert into.

  Finally, the annular yoke portion 14 is fitted and mounted on the outer diameter side of the small tooth portion 12 covered with the stator cover 13, and the small tooth portion 12 and the yoke portion 14 are integrated to form the stator 10. It is formed.

According to the above-described embodiment, the yoke portion 14 and the small tooth portion 12 are divided and manufactured, and after the winding coil 16 is applied, both are integrally formed. At this time, by fixing the stator small teeth portion 12 with a non-magnetic stator cover 13 that has both the inner diameter position holding and the insulation performance, the opening width on the inner diameter side is greatly reduced and the circumference is also shortened. be able to. In addition to the stator cover 13, the small tooth temporary fixing jig 20 is used in combination to facilitate the arrangement of the small tooth portions 12. In the present invention, since the winding coil 16 previously wound on a winding frame or the like can be put into the slot 15 between the small teeth of the stator held by the stator cover 13, the opening width on the inner diameter side and the winding circumference The stator can be manufactured without applying mechanical stress to the winding while shortening the length.
Furthermore, in the present invention, it becomes possible to provide a distributed winding motor that can greatly reduce the opening width and shorten the circumference, in an easy form, so that the copper loss of the motor can be greatly reduced. . Further, if a non-oriented electrical steel sheet or a directional electrical steel sheet having a uniform rolling direction is used for the small tooth portion 12, a reduction in iron loss can be expected. Furthermore, if it is the method of this invention, it can be used also for the stator of the manufacturing method which laminates a punching iron plate, and insulation of the inner diameter position of the stator small tooth part 12 and the stator small tooth part 12 tip is carried out. Since it can be performed simultaneously with parts, it is possible to achieve both simplification of assembly and reduction of the number of parts.

Since the yoke portion 14 and the small tooth portion 12 can be completely separated, the small tooth portion 12 with a constant magnetic flux flow is as in the method disclosed in Japanese Patent Laid-Open No. 11-318059. The magnetic steel sheets may be aligned in the rolling direction or may be configured using directional magnetic steel sheets. The winding coil 16 can be wound around a winding frame in advance and temporarily fixed before being inserted into the slot 15.
Moreover, in the said embodiment, in order to arrange | position the small tooth part 12 easily, although the position of the small tooth part 12 was temporarily fixed by providing a convex in a jig | tool and a recessed part in the small tooth part 12, a small tooth part About the recessed part of the side, the form attached only to the upper and lower sides of the thickness direction may be sufficient. Further, the inner diameter of the small tooth portion 12 may be configured to be a polygonal shape as many as the number of slots and the number of openings instead of a circle. Further, after the small tooth portion is arranged, the stator cover 13 is covered from the vertical direction of the small tooth portion 12 and fitted in the center portion in the stator slot 15. The stator cover 13 ensures the positioning of the stator small teeth 12 and the insulation of the stator small teeth 2 tip side. Thereafter, the winding coil 16 prepared in advance is inserted from the opening on the stator outer diameter side. When the winding of the winding coil 16 is completed, the small tooth portion 12 and the yoke portion 14 are connected to form an integrated stator.

It is a conceptual diagram which shows the stator by embodiment of this invention. It is a front view which shows the yoke part of FIG. It is a front view which shows the small tooth part of FIG. It is a front view which shows a small tooth part temporary fixing jig. It is the elements on larger scale of FIG. It is a front view which shows the small tooth part arrange | positioned using the small tooth part temporary fixing jig. It is a front view which shows a stator cover. It is a front view which shows the state which integrated the yoke part and the small tooth part. It is a front view which shows the conventional stator. It is a front view which shows the conventional stator which formed the yoke part and the small tooth part in the division structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Stator core 12 Small tooth part 12a Enlarged part 12b Recessed part 13 Stator cover 13a Storage part 13b Annular part 14 Relay part 14a Recessed part 15 Slot 16 Winding coil 20 Small tooth part temporary fixing jig

Claims (1)

In the method of manufacturing the stator of the distributed winding electric motor, small teeth are arranged at regular intervals around the disk-shaped small tooth temporary fixing jig, and the periphery of the disk-shaped small tooth temporary fixing jig Are formed on the inner diameter side end surface of the small tooth portion, and the concave portion of the small tooth portion is combined with the convex portion of the temporary fixing jig for the small tooth portion. And disposing the small teeth radially around the small tooth temporary fixing jig at regular intervals,
Extending radially from the annular portion and the annular portion, wherein the pair of stators cover the non-magnetic body having an accommodating portion for holding the respective teeth portions from both sides in the axial direction is covered from both sides of the teeth portion the teeth portion positioned radially by a pair of the stator cover, the stator cover slot formed by inter-teeth portions mutually are arranged to be positioned radially by a pre-wound winding coils, centrifuged insert the opening direction of the stator outer diameter side placed to ensure insulation, the with the yoke portion by assembling yoke portion of the annular outer peripheral side of the housing portion of the stator cover teeth A stator manufacturing method for an electric motor, wherein a stator is manufactured by integrating an outer portion and closing an opening on an outer diameter side .

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