一种削弱永磁同步电动机齿槽转矩的方法

为了研究实心转子永磁同步电动机的削弱措施,结合永磁电机永磁体极弧系数和永磁体不对称放置的方法,提出了一种仅改变实心转子非磁性槽楔的齿槽转矩削弱方法.通过非磁性槽楔的变化改变一个磁极的极弧宽度,其余磁极宽度不变,同时保持各个非磁性槽楔的宽度相同,通过合理的选择槽楔的形状和宽度,可以非常有效地削弱齿槽转矩.通过解析法研究了采用该方法后实心转子永磁同步电动机齿槽转矩的表达式,得到了永磁体剩磁平方的傅立叶分解表达式.据此得到了磁极的两种极弧宽度和磁极间距大小与齿槽转矩的关系式和磁极极弧宽度的确定方法.该方法仅改变了槽楔的形状,对电机结构影响较小,且合适极弧宽度组合较多,有限元验证表明该方法可有效地削弱齿槽转矩.

Method of reducing cogging torque of solid-rotor permanent magnet synchronous motors

A new method is advised to reduce the cogging torque of solid-rotor permanent magnet synchronous motor.Only changing the nonmagnetic slot wedge,was the pole arc width of one pole changed in this method,and the interval between two adjacent poles was the same.By suitably selecting the shape and width of nonmagntic slot wedge,the cogging torque could reduced.The analytical expression of cogging torque of solid-rotor PM synchronous motor with this method was got.Based on the analytical expression,the Fourier expression of the square of residual flux density of PM was got.Then the method to calculate the width of pole arc was advised.At last,the finite element method was used to calculate the cogging torque of one prototype,and the results verify that the cogging torque can be greatly reduced with this method.