Motor

Abstract

The motor comprises a stator, in which windings are wound around each of a plurality of stator teeth provided on a stator core, and a rotor, in which a plurality of permanent magnets that exceeds thenumber of stator teeth are disposed at equal intervals around a periphery of a rotor core. In this motor, the stator teeth are arranged into a plurality of stator teeth groups, in which the windings to which the same phase voltage is applied are positioned adjacent to one another, and the windings on adjacent stator teeth in the group are wound in opposite directions. Furthermore, an interpolar angle Theta s(deg) between the stator teeth within each stator teeth group is set to any angle that satisfies the requirement: 360 / P(deg)<=Theta s(deg)<=360 / T(deg) where T is the total number of statorteeth and P is the total number of permanent magnets. A motor is provided, which produces a high level of torque, displays minimal distortion of the induced voltage waveform, and is capable of being optimized in accordance with the required levels of controllability and cogging torque.

Description

technical field [0001] The present invention relates to a motor, in particular to a motor applicable to battery electric vehicles (PEV), hybrid electric vehicles (HEV), fuel cell vehicles (FCEV) and the like, as well as home appliances and robots. Background technique [0002] Conventionally, as a motor suitable for electric battery vehicles (PEV), hybrid electric vehicles (HEV), fuel cell vehicles (FCEV), etc., a concentrated winding embedded magnet type motor is known (for example, refer to Japanese Patent Laid-Open No. 2000-245085 Bulletin). [0003] refer to Figure 7 Describe the structure of this motor. Figure 7 It is a cross-sectional view of the main part of the motor cut on a plane perpendicular to the rotation center axis of the motor. Figure 7 Among them, coils 3 are wound around a plurality of (twelve in the illustrated example) salient poles 2 arranged at equal intervals on the inner peripheral portion of a stator core 1 to form a stator 11 . The rotor 12 for...

AI Technical Summary

Problems solved by technology

[0005] However, although the concentrated winding motor disclosed in Japanese Patent Laid-Open No. 2000-245085 has the advantage of realizing high torque, it has the problem that the waveform distortion is found in the reverse voltage (reverse voltage). When the waveform skew of the voltage increases, the eddy current will be increased, which will increase the iron loss and reduce the efficiency

In this structure, the circumferential dimension of the front end of the salient pole is smaller than the effective width of the permanent magnet circumferential direction, and since the coils of the stator are wound intensively, there is a problem that skew occurs in the induced voltage waveform, which affects the controllability, and , as the rotation speed increases, the peak value of the skewed waveform becomes larger and rises rapidly. Since the peak voltage exceeds the allowable voltage, it is impossible to achieve high-speed rotation due to the limitation of the voltage.

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