Motor and its control device

Abstract

A motor (100) includes: a rotor (10) having permanent magnets (12) with N poles and S poles alternately arranged in the circumferential direction; seven stator magnetic pole groups, each having a plurality of stator magnetic poles (53, 54, 55, 56, 57, 58, 59) arranged in the circumferential direction in such a manner that the stator magnetic poles are shifted both in the circumferential directionand the axial direction; and a plurality of loop windings (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52) formed in the circumferential direction while being arranged at the adjacent position to each of the stator magnetic pole groups along the axial direction.

Description

technical field [0001] The present invention relates to an electric motor mounted on an automobile, a truck, etc., and a control device thereof. Background technique [0002] Conventionally, there is known a brushless motor in which coils of respective phases are concentratedly wound around stator poles (for example, refer to Patent Document 1). Fig. 141 is a longitudinal sectional view showing a schematic structure of such a conventional brushless motor. In addition, FIG. 143 is a cross-sectional view along line A1-A1 in FIG. 141 . These figures show a 4-pole, 6-slot brushless motor. The winding structure of the stator is so-called concentrated winding, and the coils of each phase are concentratedly wound on each stator magnetic pole. In addition, FIG. 142 shows the arrangement relationship of windings such as U, V, W, etc. in a state where the stator is developed one turn in the circumferential direction. The horizontal axis is expressed in electrical degrees, and one r...

AI Technical Summary

Problems solved by technology

[0005] However, the conventional brushless motors disclosed in Fig. 141, Fig. 142, Fig. 144 and Patent Document 1 have the following problems: since the motor winding needs to be wound according to each stator magnetic pole, the structure is complicated; on the inner side, so the productivity decreases due to the winding of the motor winding

In addition, this structure also has the problem that it is difficult to achieve miniaturization, high efficiency, and low cost.

In addition, since there are only three salient poles of the stator in the electrical angle range of 360 degrees, there is a problem that it is difficult to generate the magnetomotive force generated by the stator into a sinusoidal wave shape to precisely generate a rotating magnetic field, and it is difficult to apply it to a synchronous reluctance motor or a synchronous reluctance motor. Various motors or induction motors to which reluctance torque is applied

[0006] In addition, in the case of a stator structure capable of distributed winding as shown in FIG. , so the space factor of the winding becomes low, and since the axial length of the coil end becomes long, it is difficult to miniaturize the motor

In addition, there is a problem that the productivity of the winding is lowered.

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