Electromagnetic vibration weakening method for permanent magnet driving motor of electric automobile

Abstract

The invention discloses an electromagnetic vibration weakening method for a permanent magnet driving motor of an electric automobile. The method comprises: stator grooves are disposed between stator teeth, and armature windings are disposed in the stator grooves; the width of at least one stator slot in the stator slots is different from the widths of other stator slots, and the widths of other stator slots are the same; the stator slots adopt straight slot structures, the ratio of the total slot width to the pitch of the motor is kept unchanged, and the total slot area of the motor is kept unchanged; the circumferential angles of the stator slots with different widths and the circumferential angles of the other stator slots with the same width are determined by Kt, and the value of Kt ischanged to enable Gn to be equal to 0; and Gn is the influence of the distribution of the stator slots on the cogging torque, and Kt is the ratio of the widths of other stator slots with the same width to the widths of stator slots with different widths. The torque ripple weakening effect equivalent to that of a stator skewed slot can be achieved by changing the width of a motor stator slot, and the torque ripple weakening effect can be achieved by replacing a stator skewed slot or rotor skewed pole method in the industry.

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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