JP4882274B2 - Stator structure of rotating electrical machine - Google Patents

Description

  The present invention relates to a stator structure for a rotating electrical machine, and more particularly to a stator structure for a rotating electrical machine in which a tooth portion around which a coil winding is wound is provided with a flange portion.

Conventionally, the stator core of an electric motor is formed by a laminated core obtained by laminating electromagnetic steel plates such as silicon steel plates in the rotation axis direction, and compresses a mixture of ferromagnetic powder such as iron alloy powder and ferrite powder and an insulating binder. It is known to form a sintered or compression-molded powder core.
As an electric motor having such a stator, for example, there is a “flat motor stator” (see Patent Document 1), and a base iron core on which windings are arranged is manufactured using a soft magnetic steel powder metal molding material.
JP 2004-274971 A

  However, when the coil winding (wire) is wound around the teeth portion of the stator core, there is a possibility that bending stress is generated in the heel itself due to the tension of the coil winding applied to the heel portion of the tooth portion, and the heel is damaged.

  5A and 5B show a stator core in a conventional stator structure, in which FIG. 5A is a cross-sectional explanatory view in a state where no bending stress is generated in the reed, and FIG. 5B is a cross-sectional explanatory view in a state where the bending stress is generated in the reed (part 1). (C) is sectional explanatory drawing of the state (the 2) in which bending stress generate | occur | produces in a collar. As shown in FIG. 5, a coil winding 3 is wound around the outer periphery of the stator core 1 via an insulator 2, and a flange (outward flange) portion formed by expanding the protruding end of the stator core 1. When the coil winding 3 is wound so as not to cover 1a, no bending stress is generated in the flange 1a (see (a)).

  On the other hand, when the coil winding 3 is wound around the flange 1a, the bending stress p is applied to the flange 1a through the inclined surface 2a of the insulator 2 formed in accordance with the inclination of the flange 1a. Occurs (see (b)). As described above, the bending stress p is generated in the flange portion 1a even when the surface with which the coil winding 3 of the insulator 2 contacts is not the inclined surface but the vertical wall surface 2b (see (c)).

Accordingly, it is necessary to increase the thickness of the flange 1a in order to resist the bending stress p generated in the flange 1a itself. In particular, when a low-strength material such as a dust material aiming at loss reduction is used, a sufficient thickness of the flange portion 1a is required. Thus, increasing the thickness of the flange 1a leads to an increase in the size of the stator core 1, and further increases the size of the electric motor.
An object of the present invention is to provide a stator structure of a rotating electric machine that does not cause an increase in size and that does not cause a risk of damage to the heel due to bending stress generated in the heel itself due to the tension of the coil winding.

To achieve the above object, a stator structure of a rotary electric machine according to the present invention, in the stator structure of the rotary electric machine having a stator core projecting from the columnar teeth coil winding is wound through the i Nshureta, the teeth Has a flange portion formed wider at the columnar end portion in the circumferential direction of the rotating electric machine than the columnar center portion, and the flange portion becomes narrower as it approaches the columnar center portion from the columnar end and has the widest width. A first vertical wall surface orthogonal to the direction of rotation of the coil winding at least in the tension direction of the coil winding , and the insulator is connected to the first vertical wall surface on the flange side. A second vertical wall surface facing and locking in parallel, and a third vertical wall surface provided in the same position in the radial direction of the rotating electrical machine on the coil side and parallel to the second vertical wall surface. The coil is placed on the buttocks Wound around the third vertical wall surface Te.

According to the present invention, the rotation in the stator structure of the rotary electric machine having a stator core projecting from the columnar teeth coil windings via i Nshureta is wound, the teeth, rather than columnar central portion of the columnar end The flange portion is formed to be wide in the circumferential direction of the electric machine, and the flange portion becomes narrower as it approaches the columnar central portion from the columnar end, and at least between the widest width portion and the narrowest width portion. A first vertical wall surface orthogonal to the tension direction of the coil winding in the rotating electric circumferential direction, and the insulator faces and locks parallel to the first vertical wall surface on the flange side. And a third vertical wall surface that is provided at the same position in the radial direction of the rotating electrical machine on the coil side and is parallel to the second vertical wall surface, and the coil includes the third vertical wall surface at the flange portion. invited Runode, a large wound on the vertical wall surface It not, there is no possibility that the flange is damaged by bending stress generated in the flange itself by the tension of the coil winding.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing a part of a stator core according to an embodiment of the present invention. As shown in FIG. 1, a stator core (stator core) 10 that forms a stator of a rotating electrical machine is formed in an annular shape around a rotating electric rotating shaft (not shown), and extends along the ring. As described above, the plurality of teeth portions 11 are provided so as to protrude at substantially equal intervals.

  The teeth portion 11 is formed in a columnar shape by compression heating molding using a magnetic compact, and has a flange (outward flange) portion 12 formed by expanding the protruding end of the teeth portion 11. . A coil winding 14 is wound around the teeth portion 11 via the insulator 13 so as to be applied to the flange portion 12.

  As for the collar part 12, the back surface side is following the outer peripheral surface of the teeth part 11 via the inclined surface 12a, the vertical wall surface 12b, and the flat surface 12c. That is, the back surface side is an inclined surface 12 a that is inclined downward toward the outer peripheral surface of the tooth portion 11, a vertical wall surface 12 b along the protruding direction axis (vertical axis) of the tooth portion 11, and a flat surface substantially parallel to the surface-side flat surface. 12c is formed continuously.

  A portion corresponding to the flange portion 12 of the insulator 13 is formed in accordance with the shape of the rear surface side of the flange portion 12, and an inclined surface 12 a, a vertical wall surface 12 b, and a flat surface of the flange portion 12 are formed on the outer surface of the corresponding portion of the flange portion 12. An inclined surface 13a, a vertical wall surface 13b, and a flat surface 13c corresponding to the surface 12c are continuously formed. Furthermore, the insulator 13 has an outer peripheral surface 13d corresponding to the outer peripheral surface of the tooth portion 11 and a wall portion 13e having a flange (outward flange) shape substantially orthogonal to the outer peripheral surface 13d, which is continuous with the flat surface 13c. .

  Therefore, as a whole, the insulator 13 has, as a whole, a bobbin in which one end side of the cylindrical body forming the outer peripheral surface 13d has a bowl-shaped portion having an inclined surface 13a, a vertical wall surface 13b, and a flat surface 13c, and the other end side has a wall portion 13e. It is formed in a shape.

  In this way, in the stator structure of a rotating electrical machine having a stator core provided with the flange portion 12 whose diameter of the projecting end is increased and the teeth portion 11 around which the coil winding 14 is wound via the insulator 13, A tension receiving portion (longitudinal wall surface 13b) for receiving the tension of the wound coil winding wire 14 in the protruding end direction without being distributed in the protruding end direction is formed on the insulator 13 located on the back side inclined surface, and the flange portion 12 on which the insulator 13 is mounted. In addition, the insulator 13 is locked to form a locking portion (vertical wall surface 12b) that receives the tension without being dispersed in the protruding end direction.

  Further, a plurality of tension receiving portions (vertical wall surface 13b) and locking portions (vertical wall surface 12b) are formed in a step shape via connecting surfaces (flat surface 12c, flat surface 13c) along the tension direction. Yes.

  A coil winding 14 is wound around the tooth portion 11 via an insulator 13 placed on the tooth portion 11. The coil winding 14 is also applied to the vertical wall surface 13b in addition to the outer peripheral surface 13d. It winds so that it may get over the collar part 12 via 13b. At this time, since the coil winding 14 concerning the collar part 12 is wound around the vertical wall surface 13b along the protrusion direction axis | shaft (vertical axis) of the teeth part 11 similarly to the outer peripheral surface 13d instead of an inclined surface, Bending stress is hardly generated in the flange 12 itself by the tension of the coil winding 14 that is rotated.

  That is, the vertical wall surface 13b around which the coil winding 14 is wound is a surface orthogonal to the tension direction (see the arrow in the figure) of the wound coil winding 14, and when the tooth portion 11 of the insulator 13 is mounted, the vertical wall surface 13b is wound vertically. Since the wall surface 13b is in surface contact with the vertical wall surface 12b, the bending moment acting on the flange portion 12 can be greatly reduced. As a result, even if the coil winding 14 is wound around the flange 12, the stress generated in the flange 12 can be reduced as much as possible. Therefore, in the core with a flange having the flange portion 12 in the teeth portion 11, the number of turns of the coil winding 14 can be increased, and the stress generated in the flange portion due to the tension of the coil winding 14 during winding can be reduced. it can.

  FIG. 2 is an enlarged cross-sectional view showing a modification of the collar portion of the tooth portion of FIG. As shown in FIG. 2, the tooth portion 20 has a plurality of vertical wall surfaces on the back surface side of the flange portion 21, and the insulator 22 also has a plurality of vertical wall surfaces corresponding to the vertical wall surfaces. Other configurations and operations are the same as those of the tooth portion 11.

The teeth portion 20 has two vertical wall surfaces ( locking portions) 21a and 21b instead of one vertical wall surface 12b (see FIG. 1) on the back surface side of the collar portion 21, and the insulator 22 There is no inclined surface (the inclined surface 13a of the insulator 13), and there are two vertical wall surfaces ( tension receiving portions) 22a and 22b corresponding to the two vertical wall surfaces 21a and 21b. Accordingly, the insulator 22 is formed in a stepped shape in the opposite direction, continuing from the flat surface 22c through the vertical wall surfaces 22a and 22b to the outer peripheral surface 22d corresponding to the outer peripheral surface of the tooth portion 20, and as a whole, the outer peripheral surface 22d One end side of the cylindrical body to be formed has a bowl-shaped portion having vertical wall surfaces 22a and 22b, and the other end side is formed in a bobbin shape having a wall portion 22e.

  The coil winding 14 is wound around the tooth portion 20 via an insulator 22 placed on the tooth portion 20, but the coil winding 14 applied to the flange portion 21 is not inclined but is provided on vertical wall surfaces 22 b and 22 c. Since it is wound, bending stress is hardly generated in the collar portion 21 itself by the tension of the wound coil winding 14.

  That is, the vertical wall surfaces 21a and 21b around which the coil winding 14 is wound are formed of a plane orthogonal to the tension direction (see the arrow in the drawing) of the wound coil winding 14, and the bending moment acting on the flange 12 Therefore, even if the coil winding 14 is wound around the flange 12, the stress generated in the flange 12 can be reduced as much as possible.

  FIG. 3 is an enlarged cross-sectional view showing another modification of the brim portion of the tooth portion of FIG. As shown in FIG. 3, the teeth portion 25 is formed by a continuous vertical wall surface and a stepped surface, not the inclined surface, but the entire back surface side of the flange portion 26, covers the entire back surface side of the flange portion 26, An insulator 27 having a vertical wall surface is attached. Other configurations and operations are the same as those of the tooth portion 20.

  The teeth portion 25 has a substantially entire back surface side of the collar portion 26 shifted in the same direction through a plurality of vertical wall surfaces 26a (locking portions) via a step surface 26b having a constant width (for example, the height of the vertical wall surface 26a). It is formed in a reverse staircase shape. The insulator 27 has a vertical wall surface 27a and a step surface 27b that are complementarily locked and closely attached to the vertical wall surface 26a and the step surface 26b of the tooth portion 25, and is formed flush with the surface (projecting end surface) of the tooth portion 25. The surface of the tooth portion 25 is integrated to expand the surface, and has a plurality of vertical wall surfaces (tension receiving portions) 27c, 27d, and 27e formed in a reverse staircase shape.

  Therefore, the insulator 27 is formed in a reverse staircase shape that continues to the outer peripheral surface 27f corresponding to the outer peripheral surface of the tooth portion 25 through the vertical wall surfaces 27c, 27d, and 27e, and forms the outer peripheral surface 27f as a whole. One end side of the cylindrical body has a bowl-shaped portion having vertical wall surfaces 27c, 27d, and 27e, and the other end side is formed in a bobbin shape having a wall portion 27g. The number of the vertical wall surfaces 26a (locking portions) is larger than the number of the vertical wall surfaces (tension receiving portions) 27c, 27d, and 27e.

  The coil winding 14 is wound around the tooth portion 25 via an insulator 27 placed on the tooth portion 25. The coil winding 14 on the flange portion 26 is wound around the vertical wall surfaces 27c, 27d, and 27e. Therefore, bending stress is hardly generated in the collar portion 26 itself due to the tension of the wound coil winding 14.

  That is, the vertical wall surfaces 27c, 27d, and 27e around which the coil winding 14 is wound are made of a surface that is orthogonal to the tension direction of the wound coil winding 14 (see the arrow in the figure) and act on the flange portion 26. Since the bending moment can be greatly reduced, even if the coil winding 14 is wound around the flange 26, the stress generated in the flange 26 can be reduced as much as possible.

  FIG. 4 is an enlarged cross-sectional view showing still another modification of the collar portion of the tooth portion of FIG. As shown in FIG. 4, the teeth portion 30 is formed on the back surface of the collar portion 31 in a reverse staircase shape composed of a continuous vertical wall surface and a step surface (see FIG. 3) instead of the entire back surface side. A plurality of recesses that open to the inclined surface are formed in the entire area of the side inclined surface, the entire area of the inclined surface on the back surface side of the flange 31 is covered, and a convex portion corresponding to the recess is formed, and a plurality of vertical wall surfaces are provided on the outer surface. Insulator 32 having is attached. Other configurations and operations are the same as those of the tooth portion 25.

  The flange portion 31 is formed by an inclined surface 31a having a single angle on the back surface side, and a plurality of recesses 33 such as a bowl shape or a U-shaped groove shape opening in the inclined surface 31a are formed over the entire area of the inclined surface 31a. Have. The insulator 32 is arranged on the inner side surface 32a facing the inclined surface 31a corresponding to each of the plurality of recesses 33 of the flange portion 31, and is inserted into and locked in each recess 33 to be in a fitted state or a flange shape. It has a convex portion 34 such as a shape, and has a plurality of vertical wall surfaces 32b, 32c, 32d, and 32e formed in a reverse staircase shape on the outer surface.

That is, the convex portion 34 that functions as a tension receiving portion that receives the tension of the wound coil winding 14 without being distributed in the protruding end direction is a convex-shaped portion having the tension direction as the protruding direction, and the insulator 13 is locked. Thus, the concave portion 33 that functions as a locking portion that receives the tension without being distributed in the protruding end direction is formed by a concave portion into which the convex portion 34 that is a convex portion is fitted.
Further, a plurality of tension receiving portions (convex portions 34) and locking portions (concave portions 33) are formed in a step shape through connecting surfaces (inner side surface 32a and inclined surface 31a) along the tension direction. .

  As described above, according to the present invention, the stator structure of the rotating electrical machine having the stator core having the flange portion with the projecting end enlarged in diameter and the teeth around which the coil winding is wound via the insulator is provided. The tension receiving surface formed on the insulator located on the inclined surface on the back side of the part receives the tension of the wound coil winding without dispersing it in the protruding end direction, and the locking surface formed on the collar with the insulator attached However, the insulator is locked and the tension is received without being dispersed in the protruding end direction, so that the heel may be damaged by the bending stress generated in the heel itself by the tension of the coil winding without causing an increase in size. There is no.

  In the above-described embodiment, the tension receiving portion (vertical wall surface) and the insulator 13 that receive the tension of the wound coil winding 14 without being distributed in the protruding end direction are engaged and the tension is distributed in the protruding end direction. The number of latching portions (vertical wall surfaces) received without limitation is not limited to that illustrated, and the configuration (see FIG. 4) including the convex portions 34 and the concave portions 34 is a vertical wall surface (for example, the vertical wall surface 12b). You may apply combining the structure (refer FIGS. 1-3) which consists of a vertical wall surface (for example, vertical wall surface 13b).

It is sectional drawing which shows a part of stator core which concerns on one embodiment of this invention. It is an expanded sectional view which shows the collar part modification of the teeth part of FIG. It is an expanded sectional view which shows the other collar part modification of the teeth part of FIG. It is an expanded sectional view which shows the other modification of the collar part of the teeth part of FIG. The stator core in the conventional stator structure is shown, (a) is a cross-sectional explanatory diagram in a state where no bending stress is generated in the flange, (b) is a cross-sectional explanatory diagram in a state where the bending stress is generated in the flange (part 1), (c) FIG. 6 is a cross-sectional explanatory diagram of a state (part 2) in which bending stress is generated in the heel.

Explanation of symbols

10 Stator core 11, 20, 25, 30 Teeth part 12, 21, 26, 31 Eave part 12a, 13a, 31a Inclined surface 12b, 13b, 21a, 21b, 22a, 22b, 26a, 27a, 27c, 27d, 27e , 32a, 32b, 32c, 32d Vertical wall surface 12c, 13c, 22c Flat surface 13, 22, 27, 32 Insulator 13d, 22d, 27f Outer peripheral surface 13e, 22e, 27g Wall portion 14 Coil winding 26b, 27b Stepped surface 33 Recessed portion 34 Convex

Claims (4)

In the stator structure of the rotary electric machine having a stator core projecting from the columnar teeth coil winding is wound through the Lee Nshureta,
The teeth have a flange portion formed wider at the columnar end portion in the circumferential direction of the rotating electrical machine than the columnar center portion ,
The flange portion becomes narrower as it approaches the columnar central portion from the columnar end, and is at least perpendicular to the tension direction of the coil winding in the rotational electric circumferential direction between the widest width portion and the narrowest width portion. Having a first vertical wall;
The insulator is provided at the same position in the radial direction of the rotating electrical machine with the second vertical wall surface facing the first vertical wall surface parallel to the first vertical wall surface on the flange side and engaging with the second vertical wall surface on the coil side. A third vertical wall surface parallel to the second vertical wall surface;
The coil is a stator structure of a rotating electric machine that is wound around the third vertical wall surface at the flange portion . It said third vertical wall, along said tension direction consists convex portion that issues collision, the first longitudinal wall, rotating electrical machine according to claim 1, wherein the convex portion is made of a concave portion to be fitted Stator structure. Wherein the first vertical wall surface and the third longitudinal wall, the stator structure of the rotary electric machine according to claim 1 or 2 comprising a plurality of consecutive stages shape via a coupling surface along the tension direction. The stator structure of the rotating electrical machine according to any one of claims 1 to 3 , wherein the number of the first vertical wall surfaces is larger than the number of the third vertical wall surfaces .

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