JP2003111337A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating electric machine that enables broadening of a winding space without enlarging the external dimensions of a rotating electric machine or reducing the inside of pole faces. SOLUTION: Shapes of an end surface covering part 13c of an insulator 13 and an upright wall part 13e are decided in such a way that a part 13p of the outer circumferential surface of the upright wall part 13e of the insulator 13 that is positioned to correspond to the minimum thickness part 9e of a yoke 9a becomes flush with the outside circumferential surface of the yoke 9a. An opening 7e that is blocked by a part 13p of the outer circumferential surface of the insulator 13 is formed in a circumferential wall part 7b of an end bracket 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of an end bracket of a conventional rotating electric machine taken along a line of a stator side. The stator shown in this figure has a stator core 103 in which a plurality of magnetic pole portions 102 ...
And a plurality of winding portions 104 wound around the plurality of magnetic pole portions 102. The stator core 103 and the plurality of winding portions 10 are arranged on the stator core 103.
Insulator 105 made of insulating resin for insulation from 4 ...
Is installed. The insulator 105 is provided with a tubular (octagonal tubular shape in this example) standing wall portion 105 a that extends upright from the surface of the yoke 101, and the outer surface of the standing wall portion 105 a has a tubular shape of the end bracket 106. The peripheral wall portion 106a is arranged so as to be fitted. The upright wall portion 105 a plays a role of preventing electrical conduction between the winding and the end bracket 106 and a position alignment when the end bracket 106 is attached to the stator.

[0003]

However, in such a conventional rotary electric machine, the outer shape of the rotary electric machine is not enlarged or the portion surrounded by the magnetic pole faces of the plurality of magnetic pole portions 102 (inside the magnetic pole face) is not reduced. As long as the adjacent magnetic poles 102
There is a problem in that the space (winding space) 107 in which the winding is disposed between the magnetic pole portion 102 and the magnetic pole portion 102 cannot be expanded, and the wire diameter of the winding and the winding amount are limited.

An object of the present invention is to provide a rotating electric machine that can expand the winding space without enlarging the outer shape of the rotating electric machine or reducing the inside of the magnetic pole face.

[0005]

SUMMARY OF THE INVENTION A rotating electric machine to which the present invention is to be improved is a stator core in which a plurality of steel plates are laminated, and a plurality of magnetic pole portions are projectingly provided on an inner peripheral portion of an annular yoke. And a plurality of winding portions wound around the plurality of magnetic pole portions via the insulator. The insulator is an inner surface covering portion that covers the inner surface of the stator core excluding the magnetic pole surfaces of the plurality of magnetic pole portions, and an annular inner side that is continuous with the plurality of magnetic pole portions on both end surfaces of the stator core that are located on both sides in the stacking direction of the plurality of steel plates. A pair of end surface covering portions that cover the region and a standing wall portion that stands up from the outer peripheral edge portions of the pair of end surface covering portions and extends in the stacking direction are provided. Then, a pair of end brackets including a bottom wall portion, a peripheral wall portion rising from an edge portion of the bottom wall portion in the axial direction of the rotation shaft, and a bearing supporting the rotation shaft are respectively brought into contact with both end surfaces of the stator. Installed on. According to the present invention, a part of the outer peripheral surface of the standing wall portion located corresponding to the minimum thickness portion where the thickness dimension of the yoke that changes along the circumferential direction is the minimum thickness dimension is substantially flush with the outer peripheral surface of the yoke. The shapes of the end surface covering portion and the standing wall portion of the insulator are determined so that Then, the peripheral wall portions of the pair of end brackets are provided with openings that are closed by a part of the outer peripheral surface of the standing wall portion of the insulator.

In a conventional rotating electric machine, as shown in FIG.
Since the periphery of the standing wall portion 105a is surrounded by the cylindrical peripheral wall portion 106a of the end bracket 106, it is necessary to secure a certain large dimension for the thickness of the yoke, including the thickness dimensions of the standing wall portion 105a and the peripheral wall portion 106a. there were. Therefore, in the present invention, the standing wall portions are formed by forming openings in the peripheral wall portions of the pair of end brackets and closing the openings with a part of the standing wall portions of the insulator corresponding to the minimum thickness portion of the yoke. The area surrounded by the standing wall portion was expanded until a part of the outer peripheral surface of the above was substantially flush with the outer peripheral surface of the yoke. Therefore, the thickness of the yoke can be reduced by the thickness of the peripheral wall of the end bracket, and the winding space can be expanded without increasing the outer shape of the rotating electric machine or reducing the inside of the magnetic pole face. As a result, the wire diameter of the winding can be increased to reduce heat generation in the winding portion, and the amount of winding can be increased to increase the torque of the rotating electric machine. Although an opening is formed in the peripheral wall portion of the end bracket, dust and the like can be prevented from entering the rotary electric machine by the rising wall portion of the insulator that closes the opening portion.

Generally, the yoke is formed so as to have a quadrangular prism shape. In this case, an opening is formed in each of the four portions of the yoke of the peripheral wall portion of the end bracket, and the standing wall portion of the insulator is
It is preferably formed in a regular polygonal shape having four or more sides along the four sides of the yoke. With this configuration, by closing the opening with the four or more sides of the standing wall along the four sides of the yoke, the opening can be firmly closed by the wall on the side of the standing wall.

It is preferable that the yoke has its shape so that the thickness dimension of the minimum thickness portion is magnetically the minimum required dimension. In this way, the thickness of the yoke can be minimized and the winding space can be maximized.

The minimum magnetically required dimension is
It is preferable that the dimension is close to the minimum width dimension of the magnetic pole portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a half cross-sectional view of the rotary electric machine according to the present embodiment as viewed from the side, and FIG.
1C is a partial cross-sectional view of the rotating electric machine shown in FIG. 1 as viewed from the front (right side toward FIG. 1A), and FIG. 1C is a rear view of the rotating electric machine shown in FIG. 1 as shown in FIG. It is a partial cross-sectional view seen from the left side). FIG. 2 is a sectional view taken along line II-II of FIG. 1 (B) and (C) and FIG. 2 show a diagram in which the rotor 1 is omitted. As shown in FIG. 1, the rotary electric machine of this example includes a rotor 1, a stator 3, and a pair of end brackets 5, 7. Rotor 1
Are bearings 15 and 17 on end brackets 5 and 7, which will be described later.
And a rotary shaft 1a that are respectively supported by
And a permanent magnet 1c sandwiched between two rotor stacks 1b. The stator 3 has a stator core 9, a plurality of winding portions 11, ... And an insulator 13. The stator core 9 is formed by laminating a plurality of steel plates, and as shown in FIG. 3, a plurality of yokes 9a whose thickness dimension changes along the circumferential direction and a plurality of protrusions provided on the inner peripheral portion of the yoke 9a. .. (10 in this example). The yoke 9a has an annular shape having a quadrangular prism-shaped contour, and through holes 9d ... Are formed at the four corners.
Further, the minimum thickness dimension L1 of the yoke 9a is the minimum required dimension magnetically, and this dimension L1 is set to a dimension close to the minimum width dimension L2 of the magnetic pole portion 9b. A space (winding space) 9f in which the winding is arranged is formed between the adjacent magnetic poles 9b, and the magnetic poles 9b ... Are arranged in the winding space 9f. Thus, the winding portions 11 are wound via the insulators 13, respectively.

The insulator 13 is formed of a nylon-based insulating resin and is attached to the stator core 9 so as to insulate the winding portion 11 from the stator core 9. In addition, the insulator 13 includes an inner surface covering portion 13a, a pair of end surface covering portions 13b and 13c, and a pair of upstanding wall portions 13.
d and 13e. The inner surface covering portion 13a covers the inner surface of the stator core 9 excluding the magnetic pole surfaces 9c of the plurality of magnetic pole portions 9b. A pair of end face coating portions 13b, 13c
Covers an annular inner region continuous with the plurality of magnetic pole portions 9b ... Of both end surfaces of the stator core 9 located on both sides of the plurality of steel plates in the stacking direction. A pair of standing wall portions 13d, 1
3e stand up from the outer peripheral edge portions of the pair of end surface covering portions 13b and 13c, and extend in the laminating direction of the steel plates of the stator core 9. In this example, one end surface covering portion 13
b, the standing wall portion 13d, and the first insulator half portion having one half portion of the inner surface coating portion 13a, and the other end surface coating portion 13c, the standing wall portion 13e, and the inner surface coating portion 13
The second insulator half having the other half of a is fitted from both sides of the stator core 9 in the axial direction of the rotary shaft 1a to form the insulator 13.

A pair of upstanding wall portions 13 of the insulator 13.
d and 13e have the same shape, and the standing wall portion 13 will be described with reference to the standing wall portion 13e shown in FIG.
e has an octagonal tubular shape having eight wall portions 13f to 13n (13l is a missing number). Then, a part 13p of the outer peripheral surface of the standing wall portion 13e located corresponding to the minimum thickness portion 9e where the thickness dimension of the yoke 9a changing along the circumferential direction is the minimum thickness dimension is the outer peripheral surface of the yoke 9a. The insulator 13 is formed so as to be substantially flush. In this example, the minimum thickness portion 9e of the yoke 9a is
The four wall portions 13f, which are located at the center of the four sides of the yoke 9a, extend in parallel with the four sides of the inner yoke 9a of the eight wall portions 13f to 13n, and are located at every other side,
Outer peripheral surfaces 13p ... Of 13h, 13j, 13m correspond to the minimum thickness portion 9e. Therefore, the four walls 13f,
The outer peripheral surfaces 13p of 13h, 13j, 13m are substantially flush with the outer peripheral surface of the yoke 9a.

The pair of end brackets 5 and 7 are shown in FIG.
The front bracket 5 shown in FIG. 1B and the rear bracket 7 shown in FIG. The front bracket 5 is
It is provided with a bottom wall portion 5a and a peripheral wall portion 5b rising from the edge portion of the bottom wall portion 5a in the axial direction of the rotary shaft 1a. Bottom wall 5
a has a substantially square plate shape, a through hole 5c through which the rotary shaft 1a penetrates is formed in the central portion, and through holes 5d ... Are formed at the four corners. In the peripheral wall portion 5b,
4 which is open in the thickness direction of the peripheral wall portion 5b and on the stator 3 side
One rectangular opening 5e ... Is formed. Further, the peripheral wall portion 5b is provided with a recess 5f which is continuous with the through hole 5d. The front bracket 5 has a through hole 5d and a recess 5f.
And a screw that penetrates the through hole 9d of the yoke 9a.
It is attached to the stator 3. The openings 5e ... Are formed in the central portions corresponding to the minimum thickness portions 9e of the four sides of the yoke 9a, respectively, and are parallel to the four sides of the inner yoke 9a of the eight wall portions of the standing wall portion 13d. It is closed by four wall portions 13r ... In this example, the length dimension of the opening 5e extending in the axial direction of the rotary shaft 1a is substantially equal to the length dimension of the peripheral wall portion 5b extending in the axial direction of the rotary shaft 1a, and therefore the circumferential wall portion 5b is not included.
Will be formed from four wall portions rising from the four corners of the bottom wall portion 5a.

The rear bracket 7 has a structure similar to that of the front bracket 5, and includes a bottom wall portion 7a and the bottom wall portion 7a.
Peripheral wall portion 7 that rises in the axial direction of the rotating shaft 1a from the edge portion of the
and b. The bottom wall portion 7a has a substantially rectangular plate shape, and through holes 7d ... Are formed at the four corners.
The peripheral wall portion 7b includes a stator 3 and a thickness direction of the peripheral wall portion 7b.
Four rectangular openings 7e ... Opening to the side are formed. Further, the peripheral wall portion 7b is provided with a concave portion 7f which is continuous with the through hole 7d. The rear bracket 7 is attached to the stator 3 with a screw that penetrates the through hole 7d, the recess 7f, and the through hole 9d of the yoke 9a. The openings 7e are the minimum thickness portions 9 of the four sides of the yoke 9a.
The four wall portions that are formed at the portions corresponding to e, respectively, extend in parallel with the four sides of the inner yoke 9a of the eight wall portions 13f to 13n of the standing wall portion 13e described above, and that are located at alternate intervals. It is closed by 13f, 13h, 13j and 13m, respectively. In this example, the front bracket 5
Similarly, the length dimension of the opening 7e extending in the axial direction of the rotary shaft 1a is substantially equal to the length dimension of the peripheral wall portion 7b extending in the axial direction of the rotary shaft 1a.
It will be formed from four walls that rise from the four corners of the. Like the present example, the openings 5e ..., 7e ... Are formed in the peripheral wall portions 5b, 7b of the pair of end brackets 5, 7, and these openings 5e ..., 7e ... Are formed in the upstanding wall portions 13d, 13e of the insulator 13. By closing the walls 13r, 13f ..., The thickness of the yoke 9a can be reduced by the thickness of the peripheral walls 5b, 7b of the end brackets 5, 7. Therefore, the winding space 9f can be expanded as much as the thickness of the yoke 9a can be reduced without increasing the outer shape of the rotating electric machine or reducing the inside of the magnetic pole surface.

[0015]

According to the present invention, an opening is formed in the peripheral wall portions of the pair of end brackets, and the opening is closed by a part of the standing wall portion of the insulator corresponding to the minimum thickness portion of the yoke. Therefore, the region surrounded by the standing wall portion can be expanded until a part of the outer peripheral surface of the standing wall portion becomes substantially flush with the outer peripheral surface of the yoke. Therefore, the thickness of the yoke can be reduced by the thickness of the peripheral wall of the end bracket, and the winding space can be expanded without increasing the outer shape of the rotating electric machine or reducing the inside of the magnetic pole face. As a result, the wire diameter of the winding can be increased to reduce heat generation in the winding portion, and the amount of winding can be increased to increase the torque of the rotating electric machine.

[Brief description of drawings]

FIG. 1A is a half sectional view of a rotary electric machine according to an embodiment of the present invention as seen from a side surface, and FIG. 1B is a front view of the rotary electric machine shown in FIG. FIG. 3 is a partial cross-sectional view as viewed from the right side), and (C) is a partial cross-sectional view of the rotary electric machine shown in FIG. 1 as viewed from the back surface (left side as viewed in FIG. 1A).

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a front view of a stator core used in the rotary electric machine shown in FIG.

FIG. 4 is a cross-sectional view of a conventional rotary electric machine when the end bracket is cut and the stator side is viewed.

[Explanation of symbols]

1 rotor 3 stator 5,7 End bracket 5a, 7a bottom wall 5b, 7b peripheral wall 5e, 7e opening 1a rotating shaft 9 Stator core 9a York 9b Magnetic pole 11 winding part 13 insulator 13a Inner surface coating 13b, 13c End face coating part 13d, 13e Standing wall

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H002 AB04 AB05 AC03 AC06                 5H604 AA08 BB01 BB03 BB14 CC01                       CC05 CC16 DB01 PB04 QC09                 5H605 AA07 BB00 CC02 CC03 DD03                       EA06 FF01 FF06 GG04 GG06                       GG14

Claims (4)

[Claims] 1. A stator core formed by laminating a plurality of steel plates, wherein a plurality of magnetic pole portions are provided on an inner peripheral portion of an annular yoke, and an inner surface of the stator core excluding the magnetic pole surfaces of the plurality of magnetic pole portions. An inner surface covering portion that covers, a pair of end surface covering portions that covers an annular inner region that is continuous with the plurality of magnetic pole portions on both end surfaces of the stator core located on both sides in the stacking direction of the plurality of steel plates, and the pair. An insulator provided with an upright wall portion standing upright from the outer peripheral edge portion of the end face covering portion and extending in the stacking direction, and a plurality of winding portions wound around the plurality of magnetic pole portions via the insulator. A pair of end brackets including a bottom wall portion, a peripheral wall portion rising from an edge portion of the bottom wall portion in an axial direction of the rotating shaft, and a bearing supporting the rotating shaft; Both ends A rotary electric machine mounted on the stator so as to be in contact with each of the surfaces, wherein the thickness of the yoke that changes along the circumferential direction is located corresponding to the minimum thickness portion where the thickness dimension becomes the minimum thickness dimension. The shapes of the end surface covering portion and the standing wall portion of the insulator are determined so that a part of the outer peripheral surface of the standing wall portion is substantially flush with the outer peripheral surface of the yoke. In the rotating electric machine, the peripheral wall portion is formed with an opening portion that is closed by a part of an outer peripheral surface of the upstanding wall portion of the insulator. 2. The yoke has a quadrangular prism shape, and the openings are formed in portions of the peripheral wall portion of the end bracket that correspond to the four sides of the yoke, respectively. The upright wall portion of the insulator is formed of the yoke 4
It has a regular polygonal shape having four or more sides along one side, and four or more sides along the four sides of the yoke of the upright wall portion block the opening. The rotating electrical machine according to claim 3, wherein the rotating electrical machine is characterized in that: 3. The rotating electric machine according to claim 1, wherein the yoke is shaped so that the thickness dimension of the minimum thickness portion is magnetically the minimum required dimension. 4. The rotating electric machine according to claim 3, wherein the magnetically minimum required dimension is close to the minimum width dimension of the magnetic pole portion.