Method for weakening electromagnetic vibration of electric vehicle permanent magnet drive motor

Abstract

The present disclosure discloses a method for weakening the electromagnetic vibration of a permanent magnet drive motor of an electric vehicle, which includes setting stator slots between the stator teeth, and armature windings are placed in the stator slots; there is at least one stator slot width in the stator slots The width of other stator slots is different from that of other stator slots, and the width of other stator slots is the same; the stator slot adopts a straight slot structure, the total slot width and pitch ratio of the motor remain unchanged, and the total slot area of ​​​​the motor remains unchanged; it has different widths The circumferential angle of the stator slot and the circumferential angle of other stator slots with the same width are given by K t OK, and change K t value such that G n = 0; G n is the influence of stator slot distribution on cogging torque, K t is the ratio of the width of other stator slots with the same width to the width of a stator slot with a different width. By changing the width of the stator slot of the motor, the torque ripple weakening effect equivalent to that of the stator skew can be achieved, which can replace the stator skew or rotor skew in the industry to weaken the torque ripple.

Description

technical field [0001] The present disclosure relates to the technical field of electromagnetic vibration weakening of a permanent magnet synchronous motor, in particular to a method for weakening electromagnetic vibration of a permanent magnet drive motor of an electric vehicle. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In recent years, with the improvement of high temperature resistance and the reduction of price of permanent magnet materials, permanent magnet motors have been widely used in national defense, industry, agriculture and daily life. Compared with other motors, permanent magnet synchronous motors have simple structure, Higher output torque density and higher efficiency. The permanent magnet motor with superior performance can meet the high requirements of the servo system on the motor. The torque ripple of the motor ...

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Problems solved by technology

The existence of cogging torque will increase the torque ripple of the permanent magnet motor, which is not conducive to the application of the motor in high-precision control occasions

[0005] At present, the industry mainly uses the method of stator chute or rotor oblique pole to weaken the cogging torque and tooth harmonic electromotive force of the permanent magnet motor, so as to achieve the purpose of weakening the torque ripple, but the method of oblique pole or chute reduces the motor torque. The efficiency of manufacturing increases the cost of motor manufacturing, resulting in a decrease in power density or an increase in the amount of permanent magnets, which brings additional axial force and increases and reduces the electromagnetic vibration caused by the axial force of the motor; at the same time, the axial length of the motor is longer Difficult to achieve in a short time

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