JPH1094230A - Outer rotor concentrated winding rotating electric machine, and motor vehicle using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small, light, and highly efficient outer rotator concentrated winding rotating electric machine and a motor vehicle equipped with it. SOLUTION: A rotating electric machine 1 comprises a stator 2 which is equipped with a winding 5, a stator magnetic pole composed of a stator winding salient pole 42 where the stator winding 5 is wound concentrically, a salient pole 47 consisting of a magnetic substance around it, a stator yoke 41 constituting the passage of the magnetic flux of the salient pole, and a rotor 3 which has polarity at roughly equal intervals. In this case, either side of the stator winding salient pole 42 where the stator winding is wound concentrically, the salient pole piece 47 consisting of a magnetic substance around it, and the stator yoke 41 constituting the passage of the magnetic flux of the salient pole is divided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abduction type concentrated winding rotary electric machine, and more particularly to a compact, lightweight, highly efficient abduction type concentrated winding rotary electric machine and an electric vehicle provided with the same.

[0002]

2. Description of the Related Art An electric motor used for an electric vehicle such as an electric vehicle is desired to be small, light and highly efficient. For this purpose, first, a permanent magnet type, and second, a brushless motor utilizing reluctance are optimal. On the other hand, there are a method of driving an electric vehicle, a method of driving with one electric motor, and a method of dispersing a rotating machine in each drive wheel. The distributed arrangement method has various advantages such as direct drive of the wheels, high efficiency without the need for gears, and the ability to control the four wheels independently so that they can turn on the spot. This general abduction type permanent magnet motor is disclosed in the 1994 IEEJ National Convention (No. 872). Here, an example is disclosed in which a permanent magnet is arranged on the outer periphery of the stator, and the stator has the same distributed winding configuration as a general winding.
Further, in a small permanent magnet brushless motor for OA, a low-pressure epicyclic concentrated winding in which a stator winding is wound directly on salient poles is widely used.

[0003]

In the disclosed example, although there is no loss in the rotor portion, the efficiency is somewhat high and maintenance is easy, but since the winding is distributed winding, the space factor of the winding is reduced. There was no improvement, and improvement in efficiency and reduction in size and weight were not sufficient.
In addition, since the length of the end ring is long due to the distributed winding, the efficiency of the motor and the reduction in size and weight cannot be sufficiently achieved with an increase in the size of the electric motor. In addition, in the case of a large-sized machine, the method of directly winding the winding around the salient poles has disadvantages such as a decrease in space factor and insufficient insulation between the winding and the stator core.

An object of the present invention is to provide a compact, lightweight, high-efficiency external-rotation type concentrated winding rotary electric machine and an electric vehicle provided with the same.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a stator winding, a stator winding salient pole on which the stator winding is concentratedly wound, and an outer periphery thereof. And a stator having a stator yoke portion forming a flow path of the magnetic flux of the salient pole, and a rotor having polarities at substantially equal intervals. A stator winding pole in which the stator winding is intensively wound, a salient pole piece made of a magnetic material, and a magnetic flux flow path of the salient pole. Was divided.

Further, in order to make the present invention more effective,
The rotor is constituted by permanent magnets having polarities at substantially equal intervals in the circumferential direction, and the stator windings are shaped and arranged.

According to the above configuration, the space factor of the stator winding in the stator core is improved, and the winding resistance can be reduced. In addition, the length of the coil end of the stator winding is also reduced, and the size of the rotating electric machine can be further reduced.
As a result, it is possible to provide a compact, lightweight, high-efficiency abduction type concentrated winding rotary electric machine and an electric vehicle including the same.

[0008]

Embodiments of the present invention will be described below.

FIG. 1 is a structural view of an abduction type concentrated winding rotary electric machine according to the present invention, and FIG. 2 is a sectional view thereof. Here, an embodiment in which a permanent magnet rotating electric machine has eight permanent magnet poles, six stator winding salient poles, and auxiliary salient poles arranged between the stator winding salient poles will be described.

In FIG. 1, an abduction type concentrated winding permanent magnet rotating electric machine 1 includes a stator 2 and a rotor 3 rotating on the outer periphery of the stator 2. Here, the stator 2 includes a stator winding 5, a stator core 4 having the stator winding 5, a stator support plate 11 for supporting the stator core 4, and a housing 12. The rotor 3 is composed of a rotor yoke 7 and permanent magnets 6 which are arranged on the inner periphery of the rotor yoke at substantially equal intervals in the circumferential direction and are alternately magnetized to have different polarities. The stator support plate 11 and the housing 1 which are mounted via the bearing 9
2 rotatably supported.

Here, the stator core 4 includes a stator winding salient pole 42 on which the stator winding 5 is intensively wound, and a salient pole piece provided on the gap side of the stator winding salient pole 42. 47, an auxiliary salient pole 43 which does not have the stator winding 5 and is located between the stator winding salient poles 42, and a stator yoke part 4 which passes the magnetic flux of the salient poles.
It consists of 1. Here, a stator winding salient pole 42 around which the stator winding 5 is concentratedly wound, a salient pole piece 47 made of a magnetic material on the outer periphery thereof, and a stator yoke constituting a flow path of the magnetic flux of the salient pole The embodiment in which the unit 41 is entirely divided is shown. The stator winding 5 is intensively wound around the stator winding salient pole 42,
As shown in the figure, the salient pole piece 47, the auxiliary salient pole 43, and the stator yoke 41 are arranged in a space formed by them.

Stator yoke 41 and stator winding salient pole 42
And the salient pole piece 47 and the auxiliary salient pole 43 are made of a laminated silicon steel sheet,
The thin plates punched into the shapes shown in the figures are laminated and fixed, and the stator yoke 41 and the auxiliary salient poles 43 integrally punched as shown in the figure are provided with salient pole pieces 47, stator windings by tab tails or the like. The salient pole 42 is integrally fixed.

The stator winding salient poles 42 and the salient pole pieces 47 are firmly held by the stator yoke portion 41 and the auxiliary salient poles 43 so that the stator winding salient poles 42 and the salient pole pieces 47 are firmly held. At the axial position of the auxiliary salient pole 43 and the stator yoke portion 41, the supporting holes 45 provided respectively through the stator salient pole supporting plate 10 made of a thin plate are used, and integrally formed by bolts or rivets. Strongly support.

In the abduction type concentrated winding permanent magnet rotary electric machine 1 having the above-described structure, a silicon steel plate is punched into the illustrated shape including the auxiliary salient poles 43 on the housing 12 and the stator support plate 11 and integrally fixed by caulking or the like. The fixed stator yoke 41 (fixed with a support pin or the like if necessary) is fixed. Further, a stator winding salient pole 42 made of a silicon steel plate is fixed to the stator yoke 41 via a tab tail 44 in the same manner as the stator yoke 41. Here, the stator winding 5 is wound in advance as a concentrated winding coil in the illustrated shape, shaped (insulated if necessary), and stored in the space between the stator winding salient pole 42 and the auxiliary salient pole 43. If necessary, the stator winding 5 may be wound around a bobbin or the like. Here, the stator winding 5 has a three-phase configuration. U, V and W represent respective phases. After fixing the stator winding 5, the salient pole pieces 47 are fixed via the tab tails 44, and the auxiliary salient poles 43 and the salient pole pieces 47 are provided on the stator salient pole support plate 10 arranged in the axial direction. The auxiliary salient pole 43 and the salient pole piece 4 through the support hole 45
7. The stator winding salient pole 42 and the stator yoke 41 are integrally fixed. According to the above configuration, since the stator winding 5 can be wound in a line outside in advance, the space factor with respect to the storage space of the winding can be improved, and the end coil in the axial direction of the stator winding The length of the part can also be shortened. Thereby, the abduction type concentrated winding rotary electric machine 1 can reduce the resistance of the windings and can achieve high efficiency. In addition, shortening the end coil and improving the space factor of the stator winding 5 have the effect of lowering the thermal resistance between the stator winding 5 and the stator winding salient poles 42, reducing the temperature of the winding. Has the effect of lowering. This also makes it possible to further reduce the size and weight and increase the efficiency.

FIG. 3 shows another embodiment of the present invention. Here, the configuration is almost the same as the configuration shown in FIG. 1, but the stator winding salient pole 42, the stator yoke 41, and the auxiliary salient pole 43 are shown as an example of an integral structure. Accordingly, the structure becomes stronger than that of FIG. In this embodiment, the salient pole piece 47 and the auxiliary salient pole 43 have an auxiliary groove 46 on the outer periphery of the gap side. Utilizing this groove, bolt 13
The configuration in which the salient pole pieces 47 and the stator winding magnetic poles 42 are strongly fixed to the stator 2 via the stator salient pole support plate 10 placed in the axial direction of the stator core by, for example, is shown.

In this case, a method in which the molding material is flown into the auxiliary groove 46 in place of the bolt 13 and fixed is also sufficient.

FIG. 4 shows another embodiment of the present invention.

Also in the embodiment using a permanent magnet rotating electric machine,
The number of poles of the permanent magnet is eight, and the number of salient poles of the stator winding is nine. The auxiliary salient poles 43 are located between the stator winding salient poles 42.
Is shown in the examples that are not up to the void surface. In this embodiment, FIG.
As compared with the abduction type concentrated winding permanent magnet rotating electric machine shown in, the amount of magnetic flux of the stator winding increases because there is no auxiliary salient pole on the air gap surface,
The characteristics of the motor are improved. The cross-sectional structures of the rotor 2 and the electric motor are almost the same as those in FIG.

In FIG. 4, the stator core 4 is a stator winding salient pole 4.
2, a salient pole piece 47 provided on the gap side of the stator winding salient pole 42, and an auxiliary salient pole 4 located between the stator winding salient pole 42.
3 and a stator yoke portion 41 through which the magnetic flux of the salient pole passes. Here, the stator winding pole 42 on which the stator winding 5A is intensively wound, the stator yoke portion 41 and the auxiliary salient pole 43 constituting the flow path of the magnetic flux of the salient pole are integrally formed of a silicon steel plate. The embodiment in which only the salient pole piece 47 made of a magnetic material and disposed on the outer periphery of the stator winding pole 42 in the stamped configuration is divided is shown.

Here, the stator winding 5 is shown in the embodiment divided into two. The stator winding 5A is intensively wound around the stator winding salient pole 42, and is arranged in a space formed by the salient pole piece 47, the auxiliary salient pole 43, and the stator yoke 41 as shown in the figure. On the other hand, the stator winding 5B is arranged in a space formed by the auxiliary salient pole 43, the salient pole piece 47, and the stator yoke 41. That is, the stator winding 5 is formed by a small concentrated winding coil wound around the stator winding magnetic pole 42.
A and a stator winding 5B of the same concentrated winding coil that is large enough to accommodate the small concentrated winding coil. That is, the feature is that the concentrated winding stator windings are arranged in a multiplexed manner.

In FIG. 4, the divided salient pole pieces 47 are integrally fixed to the stator winding salient poles 42 by tab tails or the like provided on the outer periphery of the stator winding salient poles 42. Here, the pole piece 47 has a shape connected to the adjacent pole piece via a bridge, and the bridge increases the magnetic flux generated by the stator winding, thereby increasing the inductance of the stator winding 5. An abduction type concentrated winding rotary electric machine having a strong structure can be configured with a configuration having a small number of parts. If necessary, a stator salient pole support plate 10 may be provided in the axial direction of the stator core to further firmly fix the stator core.

Here, the stator windings 5A and 5B are wound beforehand as concentrated winding coils in the shape shown in the figure, and then shaped (insulated if necessary) to form a space between the stator salient poles 42 and the auxiliary salient poles 43. To store. If necessary, the stator windings 5A, 5A
B may be wound around a bobbin or the like.

According to the above configuration, the stator windings 5A and 5B can be wound in a line in advance outside in the same manner as in the embodiment of FIG. 1, so that the space factor for the storage space of the windings is improved. The length of the end coil portion in the axial direction of the stator winding can be reduced. Thereby, the abduction type concentrated winding rotary electric machine 1 can reduce the resistance of the windings and can achieve high efficiency. In addition, shortening the end coil and improving the space factor of the stator winding 5 have the effect of reducing the thermal resistance between the stator winding 5 and the stator winding salient poles 42, and reducing the temperature of the winding. Has the effect of lowering. This also makes it possible to further reduce the size and weight and increase the efficiency.

Furthermore, since the stator windings 5A and 5B are divided and accommodated in the stator core,
The cooling between the stator windings 5A and 5B can be performed via the auxiliary salient poles between the stator windings A and 5B. Therefore, the temperature rise of the stator winding can be reduced as compared with the case where the stator winding is manufactured integrally, and in particular, the temperature at the center of the stator winding can be reduced.

The above effect can be exerted more strongly in the case where the structure such as the water cooling is provided in the portion such as the stator salient pole support plate 11 or the like.

In particular, by arranging the cooling pipe in the stator yoke portion 41, the cooling can be more effectively improved. Further, in the arrangement of the cooling pipe in the stator yoke 41, in the conventional distributed winding, the coil end portion is large, and it is difficult to arrange the cooling tube by occupying the inner side, but in the concentrated winding method, the coil end is short because the coil end is short. A space is created on the inner diameter side of the end, and the cooling pipe can be easily arranged.

The above description is directed to a permanent magnet rotating electric machine in which the number of permanent magnet poles is eight and the number of stator winding salient poles is six and nine. Further, one embodiment in which the auxiliary salient pole 43 is disposed between the stator winding salient poles 42 has been described. However, the present invention is not limited to the above configuration. For example, a configuration having no auxiliary salient pole and a permanent magnet The ratio between the number of poles and the number of salient stator winding poles is 2: 3 or 6: 7 and 6: 5 or 8: 9.
Also, a configuration such as 8:10 is effective. Further, the present invention also provides effective results for a permanent magnet rotor in which a permanent magnet is arranged in a magnetic material, and a reluctance rotor in which a magnetic material having saliency is arranged instead of a permanent magnet. It is possible to demonstrate.

[0028]

As described above, it is possible to provide a compact, lightweight, high-efficiency abduction type concentrated winding rotary electric machine and an electric vehicle provided with the same.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of an epi-rotation type concentrated winding rotary electric machine according to the present invention.

FIG. 2 is a cross-sectional view of an abduction type concentrated winding rotary electric machine according to the present invention.

FIG. 3 is an explanatory view of a second embodiment of the epicyclic concentrated winding rotary electric machine according to the present invention.

FIG. 4 is an explanatory view of a third embodiment of an epicyclic concentrated winding rotary electric machine according to the present invention.

[Explanation of symbols]

1. Abduction type concentrated winding rotary electric machine, 2 .... stator, 3 .... rotor,
4 ... stator core, 5 ... stator winding, 6 ... permanent magnet, 7 ...
Rotor yoke, 8: shaft, 11: stator support plate, 4
DESCRIPTION OF SYMBOLS 1 ... stator yoke part, 42 ... stator winding salient pole, 43 ... auxiliary salient pole, 44 ... tab tail, 45 ... support hole, 47 ... salient pole piece.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Kobayashi 7-1-1, Omikacho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Motoya Ito 7-1, Omikamachi, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd. Hitachi Research Laboratories (72) Inventor Suetaro Shibukawa 2520 Oji Takaba, Hitachinaka City, Ibaraki Prefecture Inside Hitachi Ltd. Automotive Equipment Division

Claims (8)

[Claims] 1. A stator salient pole comprising a stator winding, a stator winding salient pole on which the stator winding is concentratedly wound, and a salient pole piece made of a magnetic material on the outer periphery thereof. And a stator having a stator yoke portion constituting a flow path of the magnetic flux of the salient poles, and a rotor having a polarity at substantially equal intervals. A stator winding salient pole in which wires are concentratedly wound, and either a salient pole piece made of a magnetic material or a stator yoke portion forming a magnetic flux flow path of the salient pole are divided on the outer periphery thereof. An abduction type concentrated winding rotary electric machine characterized by the above. 2. An abduction type concentrated winding rotary electric machine according to claim 1, wherein said rotor is constituted by permanent magnets having polarities substantially equally spaced in a circumferential direction. 3. A salient pole flux path according to claim 1, wherein an auxiliary salient pole having no stator winding is provided between the stator winding salient poles on which the stator winding is intensively wound. An external rotation type concentrated winding rotary electric machine integrally provided with the stator yoke part constituting the above. 4. The salient pole according to claim 3, wherein the salient pole of the stator winding separated from the stator yoke constituting the magnetic flux flow path of the salient pole or the salient pole piece on the outer periphery thereof has no stator winding. An abduction type concentrated winding rotary electric machine fixed to a stator yoke via a support member arranged in the axial direction of an auxiliary salient pole. 5. An auxiliary groove is provided on a gap surface of a salient pole piece made of a magnetic material provided on an outer periphery of a stator winding salient pole on which said stator winding is intensively wound. And an abduction type concentrated winding rotary electric machine holding salient poles divided through the auxiliary grooves. 6. An abduction type concentrated winding rotary electric machine according to claim 1, wherein the concentrated winding stator windings are arranged in a multiplexed manner. 7. An abduction type concentrated winding rotary electric machine according to claim 1, wherein only the salient pole pieces are divided. 8. An electric vehicle equipped with the abduction type concentrated winding rotary electric machine according to claim 1.