JP2009201314A - Stator for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for a rotary electric machine that achieves improvement in manufacturing efficiency and quality of a resin bobbin by preventing the occurrence of molding strain during resin molding of the resin bobbin. <P>SOLUTION: The inner face of a winding part 5b includes a first rib part 5o and a pair of second rib parts 5p respectively protrudingly toward the axial end face of a core piece 4. The first rib part 5o is arranged in the vicinity of the boundary between the yoke-side partition part 5a and the winding part 5b so as to connect the inner face of a first plane part 5h and that of a second plane part 5j to each other. Each chip part of the first rib part 5o and the pair of second rib parts 5p is brought into contact with the axial one end face of the core piece 4. The first rib part 5o and the pair of second rib parts 5p are brought into contact with the axial one end face of the core piece 4. Consequently, a space is opened between the axial end face of the core piece 4 and the inner face of a resin bobbin 5 at a part facing the axial end face so as to form a hollow shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stator of a rotating electric machine used for, for example, a permanent magnet motor.

  For example, in a conventional stator of a rotating electrical machine as shown in Patent Document 1, a plurality of core pieces (divided cores) are connected to each other to form an annular stator core that surrounds the outer peripheral surface of the rotor. This core piece has a yoke part, a tooth part, and an intermediate part (winding part of the core piece). Further, a resin bobbin that is a resin (synthetic resin) molded product is attached to the core piece.

  This resin bobbin has a yoke side partition portion that covers the yoke portion, a teeth side partition portion that covers the teeth portion, and a winding portion (coil winding portion) that covers the intermediate portion. A coil is provided on the core piece by winding a conductive wire around the outer surface of the winding portion of the resin bobbin.

JP-A-9-182342

  In the stator of the conventional rotating electric machine as described above, the difference in thickness (thickness dimension) of each part of the yoke-side partition portion, the winding portion, and the teeth-side partition portion of the resin bobbin is relatively large. In particular, a connecting member (phase ring) for conducting wires is disposed on the end face in the axial direction of the yoke-side partition, and the yoke-side partition has a wall thickness in order to provide a predetermined space between the connection member and the yoke. The thickness is larger than the thickness of other parts. In addition, the shape of the four corners of the winding section is an R shape (rounded shape) in order to wind the conductor wire around the outer surface of the winding section without any gap, and the axial end face of the winding section in the cross section The wall thickness is larger than the wall thickness of the end face in the circumferential direction.

  Here, if the dimensional difference in the thickness of each part of the resin bobbin is large, molding distortion such as sink or crazing may occur in the resin bobbin in the molding process of the resin bobbin. When such molding distortion occurs in the resin bobbin, cracks are likely to occur in the resin bobbin due to aging of the resin, and the insulation (dielectric strength) of the resin bobbin is lower than the design value due to this crack. However, the rotational characteristics of the rotating electrical machine may change.

  On the other hand, in order to suppress the occurrence of molding strain, it is necessary to specify the cause of the molding strain and then change the shape of the resin molding die or the molding conditions. However, changing the shape of the molding die or changing the molding conditions requires the experience, skill, labor, and time of an engineer, so that the manufacturing efficiency of the resin bobbin decreases and the manufacturing cost increases. There are challenges.

  The present invention has been made to solve the above-described problems, and can suppress the occurrence of molding distortion during resin molding of a resin bobbin, thereby improving the production efficiency and quality of the resin bobbin. An object of the present invention is to obtain a stator of a rotating electric machine that can be used.

  The stator of the rotating electrical machine according to the present invention includes a yoke portion, a tooth portion, and an intermediate portion that connects the yoke portion and the tooth portion, and is connected to each other so as to form an annular stator core that surrounds the outer peripheral surface of the rotating shaft. A plurality of core pieces, a yoke-side partition that covers the yoke so as to partition the yoke and the intermediate, a teeth-side partition that covers the teeth so as to partition the teeth and the intermediate, and a winding that covers the intermediate A resin bobbin having a plurality of resin bobbins provided on each of the plurality of core pieces and a plurality of coils provided on the outer surfaces of the respective winding portions of the plurality of resin bobbins. Is formed of resin so that a space is formed between the axial end surface of the outer surface of the core piece and the inner surface of the portion facing the end surface.

  In the stator of the rotating electrical machine according to the present invention, the resin bobbin is formed of resin so that a space is formed between the axial end surface of the outer surface of the core piece and the inner surface of the portion facing the end surface. The difference in thickness of each part of the resin bobbin is smaller than the resin bobbin in the stator of the conventional rotating electric machine, and the resin when molding the resin bobbin is more easily spread in the mold than the conventional one. As a result, it is possible to suppress the occurrence of molding distortion during resin molding of the resin bobbin, and to improve the production efficiency and quality of the resin bobbin.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a plan view showing a permanent magnet motor according to Embodiment 1 of the present invention.
In FIG. 1, the permanent magnet motor has an annular stator 1 and a rotor 2 that is rotatably provided on the inner periphery of the stator 1. A plurality of permanent magnets 3 are fixed to the outer peripheral surface of the rotor 2 at intervals in the circumferential direction. The stator 1 has a plurality of core pieces 4, a plurality of resin bobbins 5, and a plurality of coils 6. The plurality of core pieces 4 are connected to each other so as to form an annular stator core. Moreover, the core piece 4 is comprised by the several magnetic board (for example, silicon steel plate) mutually laminated | stacked.

  Furthermore, the core piece 4 has a yoke part 4a, an intermediate part (winding part of the core piece) 4b, and a tooth part 4c. The outer peripheral surface of the yoke portion 4a is curved in an arc shape. The intermediate part 4b protrudes radially inward from the inner peripheral surface of the yoke part 4a. The teeth part 4c is arrange | positioned so that it may protrude toward the radial direction both sides from the front-end | tip location of the intermediate part 4b. Moreover, the inner peripheral surface of the teeth part 4c is curved and arranged so as to be parallel to the outer peripheral surface of the yoke part 4a. That is, the yoke part 4a and the teeth part 4c are connected by the intermediate part 4b.

  The resin bobbin 5 is attached to the core piece 4. A conductor is wound around the outer surface of the resin bobbin 5, and the coil 6 is configured by this conductor. Here, when a current flows through the conducting wire, the coil 6 is excited, and the magnetic force from the coil 6 is transmitted from the intermediate portion 4b to the entire core piece 4. Then, when the magnetic field of the stator 1 and the magnetic field of the permanent magnet 3 of the rotor 2 cross each other, a rotational torque is generated in the rotor 2 and the rotor 2 is rotated.

  FIG. 2 is an exploded perspective view showing a part of the stator 1 of FIG. 1 in an exploded manner. In FIG. 2, the resin bobbin 5 is configured by combining first and second divided bobbin pieces 5X and 5Y with each other. The shapes of the first and second divided bobbin pieces 5X and 5Y coincide with each other. The first and second divided bobbin pieces 5X and 5Y are formed by a synthetic resin molding process, that is, a resin molding.

  The first divided bobbin piece 5X is arranged so as to cover the end face on one side of the outer side of the core piece 4 (one side in the axial direction of the rotation axis of the rotor 2; the front side in the figure). The second divided bobbin piece 5Y is arranged so as to cover the end face on the other axial side (the back side in the drawing) of the outer face of the core piece 4. Each of the 1st and 2nd division | segmentation bobbin pieces 5X and 5Y has the yoke side partition part 5a, the coil | winding part (coil winding part) 5b, and the teeth side partition part 5c. The respective shapes of the yoke-side partition portion 5a, the winding portion 5b, and the teeth-side partition portion 5c correspond to the shapes of the yoke portion 4a, the intermediate portion 4b, and the tooth portion 4c of the core piece 4 (can be fitted). It has a shape.

  The yoke side partition portion 5a is configured by first to fourth yoke covering surface portions 5d to 5g. More specifically, the end surface in the axial direction of the yoke-side partitioning portion 5a, that is, the end surface on the labor side of the drawing in the first divided bobbin piece 5X, or the end surface on the far side in the drawing in the second divided bobbin piece 5Y is 1 yoke covering surface portion 5d is used. Moreover, the end surface (upper end surface in the figure) on the radially outer side of the yoke-side partition portion 5a is constituted by the second yoke covering surface portion 5e. Furthermore, the end surfaces (the left end surface and the right end surface in the figure) on both sides in the circumferential direction of the yoke-side partition portion 5a are constituted by the third yoke covering surface portion 5f. Moreover, the end surface (lower end surface in the drawing) on the radially inner side of the yoke-side partition portion 5a is constituted by a fourth yoke covering surface portion 5g.

  The second yoke covering surface portion 5e and the pair of third yoke covering surface portions 5f are arranged to form a U-shaped edge, and the U-shaped edge is the first or second divided bobbin piece 5X. , 5Y abuts against the end surface of the yoke portion 4a in the axial direction when attached to the core piece 4. On the other hand, when the first or second divided bobbin piece 5X, 5Y is attached to the core piece 4, a part of the fourth yoke covering surface part 5g is joined to the surface of the yoke part 4a on the tooth part 4c side.

  That is, when the first or second divided bobbin piece 5X, 5Y is attached to the core piece 4 by the first to fourth yoke covering surface parts 5d to 5g, the axial end face of the yoke part 4a and the end face thereof A space is formed between the first yoke covering surface portion 5d and the opposite surface. Further, in a state where the first and second divided bobbin pieces 5X and 5Y are combined with each other, each yoke-side partitioning portion 5a extends like a bowl from the outer surface of the winding portion 5b to the outside of the winding portion 5b. It becomes a state. That is, the coil 6 and the yoke portion 4a are partitioned from each other by the yoke-side partition portion 5a.

  The winding part 5b is comprised by the 1st plane part 5h, the curved surface part 5i, and the 2nd plane part 5j, and has a U-shaped cross section. Further, in a state where the first and second divided bobbin pieces 5X and 5Y are combined with each other, the respective winding portions 5b of the first and second divided bobbin pieces 5X and 5Y are combined to form a cylinder. That is, when the first and second divided bobbin pieces 5X and 5Y are combined with each other, the shape of the winding part 5b becomes cylindrical. Further, in a state where the first and second divided bobbin pieces 5X and 5Y are combined with each other, each of the first flat surface portion 5h and the second flat surface portion 5j is joined to each of both circumferential end surfaces of the intermediate portion 4b.

  The teeth side partition part 5c is comprised by the teeth coating | coated outer edge part 5k and the teeth coating expansion part 5l. The teeth coating outer edge portion 5k is arranged to form a U-shaped edge. The teeth covering widened portion 5l includes one of the first flat surface portion 5h, the curved surface portion 5i and the second flat surface portion 5j in the axial direction (the back side or the near side in the drawing), the radial inner side (the lower side in the drawing), and the circumference. It arrange | positions so that it may spread in three directions of the direction both sides (left-right direction of a figure).

  Here, in a state in which the first and second divided bobbin pieces 5X and 5Y are combined with each other, the respective teeth side partitioning portions 5c expand in a hook shape from the outer surface of the winding portion 5b to the outside of the winding portion 5b. It becomes. That is, the coil 6 and the tooth portion 4c are partitioned from each other by the teeth side partitioning portions 5c.

  Further, the tip portion of the teeth side partitioning portion 5c is arranged so that the weight of the stator 1 is not directly applied to the coil 6 when the stator 1 is laid flat (temporarily placed) in the manufacturing process of the stator 1. Make up legs. Further, in the state where the first and second divided bobbin pieces 5X and 5Y are combined with each other, an opening as an outlet for the insulating varnish is formed between the inner surface of the tooth coating spread portion 5l and the outer surface of the tooth portion 4c. Is done.

  On the other hand, the yoke-side partition portion 5a is provided with a convex portion 5m that protrudes in a convex shape from the outer surface of the first yoke covering surface portion 5d toward the opposite side of the yoke portion 4a. An opening 5n for forming a discharge port for the insulating varnish is provided at a central portion of the convex portion 5m. The projecting dimension of the convex part 5m from the outer surface of the winding part 5b coincides with the projecting dimension of the tooth-side partition part 5c from the outer surface of the winding part 5b.

  Therefore, the convex part 5m constitutes a leg for preventing the weight of the stator 1 from being directly applied to the coil 6 like the teeth side partition part 5c. In a state where the stator 1 is placed flat, the stator 1 is supported from the floor (not shown) by the tip portion of the convex portion 5m and the tip portion of the teeth side partition portion 5c, and the coil 6 and the floor A space is provided between the coil 6 and the coil 6 so that pressure due to the weight of the stator 1 is not applied to the coil 6.

  Here, a first rib portion 5o and a pair of second rib portions 5p as protruding portions are provided on the inner surface of the winding portion 5b so as to protrude toward the axial end surface of the core piece 4. . The first rib portion 5o is disposed in the vicinity of the boundary between the yoke-side partition portion 5a and the winding portion 5b so as to connect the inner surface of the first flat surface portion 5h and the inner surface of the second flat surface portion 5j. A pair of 2nd rib part 5p is arrange | positioned along the circumferential direction over the teeth coating | coated outer edge part 5k from the 1st rib part 5o at intervals in the circumferential direction (left-right direction of a figure).

  The tip portions of the first rib portion 5o and the pair of second rib portions 5p are brought into contact with one end surface of the core piece 4 in the axial direction. The first rib portion 5o and the pair of second rib portions 5p are brought into contact with one end surface in the axial direction of the core piece 4, so that the axial end surface of the core piece 4 and the portion facing the end surface are arranged. A space is formed between the inner surface of the resin bobbin 5 and a hollow shape is formed. Therefore, the resin bobbin 5 is molded to have a hollow structure.

  3 is a cross-sectional view taken along line III-III in FIG. In FIG. 3, the inner surface of the curved surface portion 5i is inclined from the first rib portion 5o toward the teeth coating spread portion 5l (from the upper right to the lower left in the drawing) with respect to the axial end surface of the intermediate portion 4b. . The inner surface of the curved surface portion 5i forms a discharge path (flow path) for the liquid (before curing) insulating varnish.

  When the curved surface portion 5i is inclined, when the insulating varnish enters the inside of the resin bobbin 5 with the impregnation treatment of the insulating varnish of the stator 1, the insulating varnish passes through the teeth coating spread portion 5l. Then, the teeth are discharged from the opening formed by the outer peripheral edge 5k of the teeth.

  4 is a cross-sectional view taken along line IV-IV in FIG. In FIG. 4, the inner surface of the first yoke covering surface portion 5d is inclined with respect to the axial end surface of the yoke portion 4a from the third yoke covering surface portion 5f toward the opening 5n (from the left end or the right end to the center in the drawing). ing. The inner surface of the first yoke covering surface portion 5d forms a discharge path for the liquid insulating varnish, similarly to the inner surface of the curved surface portion 5i.

  When the first yoke covering surface portion 5d is inclined, as in the case of the curved surface portion 5i, when the insulating varnish enters the inside of the resin bobbin 5 along with the impregnation treatment of the insulating varnish of the stator 1, The insulating varnish is discharged to the outside from the opening 5n through the first yoke covering surface portion 5d.

  In the stator of the rotating electric machine as described above, the resin bobbin 5 is molded of resin so that the space between the axial end surface of the core piece 4 and the inner surface of the resin bobbin 5 at a location facing the end surface is hollow. Therefore, the difference in thickness between the portions 5a to 5c of the resin bobbin 5 is smaller than that of the resin bobbin in the stator of the conventional rotating electric machine, and the resin used for molding the resin bobbin 5 is more than that of the conventional one. Since it is easy to reach the inside of the mold, the generation of molding distortion can be suppressed during resin molding of the resin bobbin 5, and the manufacturing efficiency and quality of the resin bobbin 5 can be improved.

  In addition to this, it is possible to reduce the manufacturing cost of the resin bobbin 5 by reducing the labor of an engineer associated with a change in the shape of the molding die and a change in molding conditions. Further, the amount of resin used can be reduced as compared with the resin bobbin in the stator of the conventional rotating electric machine, and the manufacturing cost can be further reduced.

  Further, since an air layer having a lower thermal conductivity (higher heat insulation) than the resin is provided between the axial end surface of the core piece 4 and the inner surface of the resin bobbin 5 at a location facing the end surface, Heat generated when the coil 6 is excited is not easily transmitted to the core piece 4, and heat loss of the core piece 4 can be suppressed.

  In addition, the inner surface of the curved surface portion 5i is inclined from the first rib portion 5o toward the tooth coating expanding portion 5l with respect to the axial end surface of the intermediate portion 4b, and the inner surface of the first yoke coating surface portion 5d is the yoke. Since it inclines toward the opening 5n from the third yoke covering surface portion 5f with respect to the axial end surface of the portion 4a, the axial end surface of the core piece 4 and the resin bobbin 5 at a location facing the end surface are provided. Since the insulating varnish is less likely to accumulate in the space between the inner surface, the amount of the insulating varnish used can be reduced.

  Furthermore, since the first and second rib portions 5o, 5p reinforce the resin bobbin 5, it is possible to suppress a decrease in strength of the resin bobbin 5 due to hollowing.

Embodiment 2. FIG.
In the first embodiment, the first rib portion 5o and the pair of second rib portions 5p are used as the protruding portions, but in the second embodiment, a plurality of columnar protruding portions 5q are used as the protruding portions. FIG. 5 is a perspective view showing a part of a permanent magnet motor according to Embodiment 2 of the present invention. In FIG. 5, the plurality of protrusions 5q are arranged in a dot shape on the inner surface of the curved surface portion 5i at intervals. Further, the tip portion of the protrusion 5q is in contact with the axial end surface of the intermediate portion 4b, similarly to the first and second rib portions 5o, 5p of the first embodiment. Other configurations are the same as those in the first embodiment.

  Here, in the stator of the rotating electrical machine according to the first embodiment, the impregnation step of the insulating varnish of the stator 1 is surrounded by the first rib portion 5o and the pair of second rib portions 5p on the inner surface of the resin bobbin 5. The insulating varnish sometimes stays at the spot. On the other hand, in the stator of the rotating electric machine according to the second embodiment, since the plurality of protrusions 5q are arranged in a dot shape at intervals, the protrusions are impregnated in the insulating varnish impregnation step of the stator 1. The insulating varnish can be made difficult to stay between 5q, and the amount of the insulating varnish used can be further reduced.

  In addition, although Embodiment 1 and 2 demonstrated the permanent magnet motor, this invention is applicable also to other electric motors, such as an induction motor, for example.

  In the first embodiment, the rib-shaped first and second rib portions 5o and 5p are used as the protruding portions, and in the second embodiment, the plurality of columnar protruding portions 5q are used as the protruding portions. The shape of the protruding portion is not limited to the rib shape and the column shape, and may be another shape.

It is a top view which shows the permanent magnet motor by Embodiment 1 of this invention. It is a disassembled perspective view which decomposes | disassembles and shows a part of stator of FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a perspective view which shows a part of permanent magnet motor by Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Stator, 2 Rotor, 4 Core piece, 4a Yoke part, 4b Middle part, 4c Teeth part, 5 Resin bobbin, 5a Yoke side partition part, 5b Winding part, 5c Teeth side partition part, 5n opening, 5o 1st 1 rib part (protrusion part), 5p 2nd rib part (protrusion part), 5q protrusion part (protrusion part), 6 coil.

Claims (5)

A plurality of core pieces having a yoke portion, a teeth portion, and an intermediate portion connecting the yoke portion and the teeth portion, and connected to each other so as to form an annular stator core surrounding an outer peripheral surface of the rotating shaft; A yoke-side partition that covers the yoke so as to partition the intermediate portion, a teeth-side partition that covers the teeth so as to partition the teeth and the intermediate portion, and a winding portion that covers the intermediate And a plurality of resin bobbins provided on each of the plurality of core pieces, and a plurality of coils provided on the outer surface of each of the winding portions of the plurality of resin bobbins. There,
The resin bobbin is formed of resin so that a space is formed between an axial end surface of the outer surface of the core piece and an inner surface of a portion facing the end surface. stator. A protruding portion that protrudes toward the end surface of the core piece is provided at a portion of the inner surface of the resin bobbin that faces the end surface of the core piece, and a tip of the protruding portion is formed on the core piece. The stator of a rotating electrical machine according to claim 1, wherein the resin bobbin is supported from the core piece by abutting against the end face. The stator of the rotating electrical machine according to claim 2, wherein the shape of the protruding portion is a rib shape. The stator of the rotating electrical machine according to claim 2, wherein the protrusions are a plurality of protrusions arranged in a dot pattern on the inner surface of the resin bobbin at intervals. The resin bobbin includes an opening for discharging the insulating varnish that has entered between the end surface of the core piece and the inner surface of the resin bobbin, and a discharge path for guiding the insulating varnish to the opening. The stator of the rotating electrical machine according to any one of claims 1 to 4, wherein the stator is provided.

Images