JPH10117451A - Concentrated winding dynamo-electric machine, and electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concentrated winding dynamo-electric machine with a small, light body and high efficiency, together with an electric vehicle with the dynamo electric machine. SOLUTION: A concentrated winding dynamo-electric machine has a stator 2 ad a rotor 3 with polarities at intervals. The stator 2 includes a stator winding 5, a stator winding salient pole 42 with a concentrated stator winding 5 and a stator yoke part 41 that constitutes a magnetic flux path for the salient pole 42. In addition, the stator winding salient pole 42 in a stator core 4 has a space part 45 for limiting magnetic flux in a circumferential direction, while the outer circumferential part of the stator core 4 has space part 44, for limiting the magnetic flux in the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentrated winding rotary electric machine, and more particularly to a compact, lightweight, and highly efficient 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, lightweight and highly efficient. For this purpose, first, a permanent magnet type, and second, a brushless motor utilizing reluctance are optimal. In particular, in the field of small machines, the above-mentioned brushless motors and the like adopt a concentrated winding system in which a stator winding is wound around a stator winding magnetic pole.

[0003] This conventional example is disclosed in Japanese Patent Application Laid-Open No. 7-298522 (Disclosure Example 1).

[0004]

In the first disclosed example, the stator winding is concentrated around the circumferentially divided stator magnetic poles, thereby shortening the coil end portion of the stator winding and reducing the coil length. The space factor of the electric motor can be improved, and the physique of the electric motor can be reduced. However, since the inner and outer peripheral portions of the stator core are fixed by welding to fix the stator winding salient poles, an increase in iron loss and weight reduction cannot be achieved due to the presence of the core to unnecessary portions, and Since the inner peripheral portion of the stator winding salient pole is not separated, there is a problem that harmonic magnetic flux is allowed, pulsating torque is generated, and iron loss is increased.

An object of the present invention is to provide a compact, lightweight, and highly efficient concentrated winding rotary electric machine and an electric vehicle equipped with the same, excluding the above-mentioned drawbacks of the conventional example.

[0006]

In order to achieve the above object, the present invention provides a stator winding, a stator winding salient pole on which the stator winding is intensively wound, and A concentrated winding rotating electric machine consisting of a stator having a stator yoke portion constituting a magnetic flux flow path of a pole and a rotor having polarities at substantially equal intervals. A configuration is provided in which a gap for suppressing magnetic flux in the circumferential direction is provided. Further, a gap for suppressing the magnetic flux in the circumferential direction is provided on the outer peripheral portion of the stator core.

The stator core is divided at the center of the stator winding salient pole.

According to the above configuration, when the stator winding salient pole of the stator core is provided with a gap for suppressing the magnetic flux in the circumferential direction, and is provided on the outer peripheral portion, the welding position of the stator core is improved. Is reduced to the inner circumference, thereby minimizing the occurrence of loss and achieving accurate fixing. On the other hand, by providing it on the inner periphery, it is possible to suppress harmonic magnetic flux circulating in the inner periphery, thereby achieving suppression of harmonic iron loss and suppression of pulsating magnetic flux. Further, the above effect can be maximized by forming the stator core at the center of the stator winding salient pole.

With the above configuration, it is possible to provide a compact, lightweight, and highly efficient concentrated winding rotary electric machine and an electric vehicle including the same.

[0010]

Embodiments of the present invention will be described below.

FIG. 1 is an explanatory view of a concentrated winding rotary electric machine according to the present invention, and FIG. 2 is a sectional view thereof.

Here, a description will be given of an embodiment in which the permanent magnet rotating electric machine has ten permanent magnet poles and nine stator winding salient poles.

In the figure, an electric motor 1 comprises a stator 2 and a rotor 3, and the stator 2 comprises a stator core 4 and a stator winding 5. Here, the stator core 4 includes a stator winding salient pole 42 and a stator yoke 41 that forms a path for the magnetic flux, and the stator winding salient pole 42 is composed of two parts constituting the stator winding 5. Large and small stator winding coils 51 and 5 shown in FIG.
2 is concentratedly wound, and is housed in the stator winding housing 47. Each winding does not share a magnetic path in the air gap surface. The concentrated winding stator structure can reduce the length of the end coil portion compared to the stator of the distributed winding structure used in a general large-sized machine, so that the size of the rotating electric machine can be reduced. There are advantages.

On the other hand, the rotor 3 has a configuration in which permanent magnets 6 adjacent to each other are arranged at substantially equal pitches with different polarities, and a rotor yoke 7 through which the magnetic flux of the permanent magnet passes is provided on the inner periphery.
And is rotatably held on an end bracket 10 via a shaft 8 and a bearing 9. Here, a configuration is shown in which there is no frame on the outer periphery of the stator core 4, but a frame may be used if necessary. A magnetic pole position detector PS and a position detector E for detecting the position of the permanent magnet 6 are provided on the shaft 8 of the rotor.

The U phase of the stator winding 5 has U1 +, U2
-, U3 +, V-phase V1 +, V2-, V3 +, W-phase W1 +,
W2- and W3 + are respectively connected. Here, the subscript 1 indicates the stator winding number, and + and-indicate the winding direction of the stator winding 5.

In the present invention, the stator core 4 is divided into the same number as the stator windings 5 as shown in the figure, and each has two stator winding salient poles 42, a bridge portion 43, and one stator winding. And a secondary yoke portion 41. Here, between the divided stator cores, a gap portion 44 for suppressing the circumferential magnetic flux of the outer peripheral portion is provided on the outer peripheral portion, and a gap portion 45 for suppressing the circumferential magnetic flux of the inner peripheral portion is provided on the inner peripheral portion. It is a structure provided with.

Here, a magnetic iron plate (generally made of a silicon steel plate) laminated in the axial direction is joined to the gap portion 44 for suppressing the circumferential magnetic flux in the outer peripheral portion by a weld portion 46 in the circumferential direction. At the same time, the adjacent split stator core is connected. The laminated iron plates of the split stator cores 4 are integrally laminated by punching and caulking, which is generally used at the time of punching and laminating.

Generally, a stator winding, a stator winding salient pole on which the stator winding is intensively wound, and a stator yoke portion forming a flow path of magnetic flux of the salient pole are provided. , And a concentrated winding rotary electric machine comprising a rotor having polarities at substantially equal intervals, and having a configuration in which a gap portion for suppressing magnetic flux in the circumferential direction is provided in the stator winding salient poles of the stator core. .

The stator winding salient poles 42 of the stator core 4 are provided with a gap portion 44 on the outer peripheral portion thereof for suppressing magnetic flux in the circumferential direction, so that the welding position of the stator core is set to the inner peripheral portion again. Therefore, a short circuit of the stator core 4 due to welding need not be formed. As a result, the occurrence of loss can be minimized. On the other hand, by arranging the welding portion on the inner peripheral portion, the swelling of the inner peripheral portion of the stator core 4 in the axial direction can be reduced, and a motor with high accuracy can be obtained. This leads to a reduction in noise and cogging torque. Further, the magnetic flux density in each part of the stator winding magnetic pole 42 becomes dominant in the radial direction due to the above-described divided configuration, and the magnetic flux becomes an alternating magnetic flux. In a general concentrated winding rotary electric machine, the stator winding magnetic pole has an elliptical magnetic field due to the presence of a radial magnetic flux and a circumferential magnetic flux. Therefore, the iron loss of the present invention, which is an alternating magnetic field for the same magnetic flux density, is reduced. Further, in the present invention, the magnetic flux density is reduced by the absence of the magnetic flux in the circumferential direction, and the iron loss can be further reduced.

Further, the presence of the air gap portion 45 for suppressing the circumferential magnetic flux in the inner peripheral portion suppresses the circumferential magnetic flux on the air gap side of the stator winding magnetic pole 42. This mainly has the effect of reducing harmonic magnetic flux having a short period. As a result, the effect of reducing harmonic magnetic flux that increases iron loss despite its low contribution to torque generation is exhibited. When used as a drive motor for an electric vehicle, the weight of the battery is important because the energy of the loaded battery is limited. With the configuration shown in FIG. 1, the weight of the electric motor can be reduced.

FIG. 3 shows another embodiment of the present invention.

Here, an embodiment of a permanent magnet rotating electric machine having 10 permanent magnet poles and 9 stator winding salient poles will be described.

In the present invention, a cooling pipe 9 is arranged on the outer peripheral portion with respect to the configuration shown in FIG. By dividing the stator core 4 as in FIG. 1, it is possible to reduce iron loss. Further, a cooling pipe 9 is arranged on the outer periphery of the stator core 4, and a pressure is further applied to the inside of the pipe to reduce the thermal resistance between the cooling pipe 9 and the stator core, thereby improving the cooling effect. As a result, the size, weight and efficiency can be reduced. Further, since there is no stator core 4 in the outer peripheral portion of the cooling pipe 9, there is no magnetic flux intersecting with the cooling pipe 9, so that eddy current loss (iron loss) flowing through the cooling pipe 9 can be reduced.

FIG. 4 shows another embodiment of the present invention.

Here, a description will be given of an embodiment in which the permanent magnet rotating electric machine has 10 permanent magnet poles and 12 stator winding salient poles.

The cogging torque is inversely proportional to the number of poles of the permanent magnet and the least common multiple of the number of salient poles of the stator winding. Therefore, the cogging torque of FIG. 1 is lower than that of the embodiment of FIG. FIG.
The number of permanent magnet poles is 10, and the number of stator winding salient poles is 90.
/ Rotational pulsation occurs. Although the number is large and the cogging torque is low, the air gap 4 which suppresses the circumferential magnetic flux of the inner peripheral portion is formed.
By adding 5, the number of poles of the permanent magnet is 10, the apparent salient poles of the stator winding are 18, and a pulsation of 90 / rotation similarly occurs. Since the number of gaps is doubled, the cogging torque is doubled as compared with the case where there is no gap 45 for suppressing the circumferential magnetic flux. On the other hand, the number of poles of the permanent magnet of this embodiment is 10,
In the configuration having 12 stator winding salient poles, the least common multiple is 60. However, the presence of the air gap 45 for suppressing the circumferential magnetic flux makes the number of permanent magnet poles 10 and the appearance of the stator winding salient poles 24.
Pulsation of 120 / revolution in the same manner. In this case, the number of pulsations of the cogging torque increases due to the presence of the gap portion 45 that suppresses the circumferential magnetic flux, so that the cogging torque can be reduced. Generally, in a rotating electric machine having an odd number of pole pairs and an even number of stator salient poles, the cogging torque can be reduced by providing the air gap 45 for suppressing the circumferential magnetic flux.

In this configuration, it is important that the gap portion 45 for suppressing the magnetic flux in the circumferential direction has a length in the radial direction longer than the width in the circumferential direction. By increasing the length in the radial direction, the effect of suppressing harmonic magnetic flux can be increased.

Although the concentrated winding rotary electric machine has been described above, in particular, a permanent magnet rotary electric machine having a permanent magnet rotor structure, the effects of the present invention can be exerted by a reluctance rotor. Also, not only the motor, but also the generator,
The present invention can also be applied to a rotating electric machine using an external rotation type, an internal rotation type rotor, and a claw pole type rotor. Further, the present invention can be applied not only to a rotating electric machine but also to a linear motor or the like.

[0029]

According to the present invention, it is possible to provide a compact, lightweight, highly efficient concentrated winding rotary electric machine and an electric vehicle including the same.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment showing a concentrated winding rotary electric machine of the present invention.

FIG. 2 is a sectional view of a concentrated winding rotary electric machine according to the present invention.

FIG. 3 is a sectional view showing a second embodiment of the concentrated winding rotary electric machine according to the present invention.

FIG. 4 is a sectional view showing a third embodiment of the concentrated winding rotary electric machine according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Concentrated winding rotary electric machine, 2 ... Stator, 3 ... Rotor, 4 ... Stator core, 5 ... Stator winding, 6 ... Permanent magnet, 7 ... Rotor yoke, 8 ... Shaft, 41 ... Stator yoke Part, 42 ...
Stator winding salient poles, 43 bridge portions, 44, 45 gap portions, 46 welding portions, 47 stator winding storage portions, 51, 5
2 ... stator winding coil.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Suetaro Shibukawa 2520 Oji Takaba, Hitachinaka-shi, Ibaraki Co., Ltd.Automotive Equipment Division, Hitachi, Ltd. (72) Katsuyuki Izumisawa, Hitachinaka-shi, Ibaraki 2520 Ojitakaba, Hitachi, Ltd.Automotive Equipment Division, Hitachi, Ltd.

Claims (11)

[Claims] A stator winding, a salient pole of the stator winding on which the stator winding is intensively wound, and a stator yoke constituting a flow path of the magnetic flux of the salient pole. In a concentrated winding rotary electric machine comprising a stator provided and a rotor having polarities at substantially equal intervals, the stator winding salient poles of the stator core are provided with a gap for suppressing magnetic flux in the circumferential direction. Concentrated winding rotating electric machine. 2. The stator according to claim 1, wherein the gap for suppressing the magnetic flux in the circumferential direction is an outer circumferential portion of the stator core, and an inner circumferential position of the gap is a gap side from an inner circumferential portion of the stator yoke. Concentrated winding rotating electric machine. 3. The concentrated winding rotary electric machine according to claim 2, wherein the gap provided on the outer periphery is a welded portion for fixing the stator core in the axial direction. 4. The concentrated winding rotary electric machine according to claim 2, wherein a cooling medium flows through the gap provided on the outer periphery. 5. The concentrated winding rotary electric machine according to claim 4, wherein a cooling pipe is disposed in the gap provided on the outer periphery, and a liquid cooling medium flows. 6. The stator core according to claim 1, wherein the gap for liquid or gas passage and for suppressing magnetic flux is provided on the outer periphery of the center of the salient pole either inside or outside the stator core. Central winding rotary electric machine. 7. The concentrated winding rotary electric machine according to claim 1, wherein said gap for suppressing magnetic flux in a circumferential direction is provided on an inner peripheral portion of said stator core. 8. The concentrated winding rotary electric machine according to claim 7, wherein the circumferential width of the gap for suppressing the magnetic flux in the circumferential direction is smaller than the length in the radial direction. 9. The concentrated winding rotary electric machine according to claim 7, wherein the stator core has a divided structure, and a reinforcing agent for the divided stator core is disposed in the gap for suppressing magnetic flux in a circumferential direction. 10. The concentrated winding rotary electric machine according to claim 1, wherein said stator core is divided at the center of said stator winding salient pole. 11. An electric vehicle comprising the concentrated winding rotary electric machine according to claim 1.