优化磁极形状和极弧系数的分数槽无刷直流电机齿槽转矩削弱方法

摘要

永磁电机的永磁体与有槽电枢铁心之间相互作用,产生齿槽转矩,引起电机的振动和噪声.针对一台9槽10极无刷直流电机展开分析,通过能量法和傅里叶分解法得到其齿槽转矩的表达式,并采用有限元分析方法分析了两种常用磁极形状对该电机齿槽转矩的影响.此外,通过分析极弧系数对电机齿槽转矩的影响,得出分数槽永磁电机齿槽转矩随极弧系数的变化规律.在此基础上,提出了一种电机最小齿槽转矩极弧系数确定方法,并分析改变极弧系数对电机其它参数的影响,从而验证了所提方法的有效性.%The cogging torque of permanent magnet machine (PMM) is produced by the interaction between the permanent magnet and slotted armature lamination,which can cause the noise and vibration.In this paper,a 9-slot 10-pole brushless DC motor (BLDCM) was studied.The expression of cogging torque was obtained by using the energy method and the Fourier decomposition method respectively.The influences of two common pole shapes on cogging torque were investigated with finite element method (FEM) to obtain the change regular of the cogging torque for the fractional slot PMM with the pole-arc coefficient.Besides,a selection method of pole-arc coefficient to reach the minimal cogging torque was proposed.And the influences on the other performances of machine was analyzed to verify the proposed method.