Research on shaft voltage in permanent magnet synchronous machine with sectionalized stators

To investigate the influence of sectionalized stators on shaft voltage in integer slot permanent magnetic synchronous machine (PMSM), an aid of magnet circuit and analytical method is proposed to deduce the shaft voltage, whilst segment and pole number combinations are further discussed. Finite element method (FEM) is used to verify the accuracy of above qualitative analysis. The influence of various rotation velocity, different width of joint and multiple pole-arc coefficient on shaft voltage are also analyzed. The conclusion can help PMSM designer to avoid and weaken shaft voltage.