关键词: 无齿槽无刷电动机, 磁极偏移, 径向电磁力, 振动加速度, 电磁噪声

Abstract:

The magnetic pole of rotor in the brushless motor was usually made by integral magneticing ring, magnetization distribution of magnetic rings at each pole might be offset when magnetized,which made the inconsistent width of the N and S poles, so it would have an adverse influence on the vibration and noise of motor.A pair of high-speed brushless motor prototype developed in the laboratory was used as the research object, and the influence of rotor magnetic pole shift on vibration and noise has been studied.The analytical model was applied to calculate the no-load air gap flux density,radial electromagnetic force and motor mode of magnetic pole shifting,which was in agreement with the simulation results of the finite element analysis.The finite element method was used to analyze the electromagnetic vibration and noise of the pole shift brushless motor.The experiment results of the motor mode, vibration acceleration and noise of the prototype were compared with the simulation results.

Key words: brushless motor with slotless, magnetic pole shift, radial electromagnetic force, vibration acceleration, electromagnetic noise