关键词: 麦克斯韦应力张量法, 齿槽转矩, 永磁体

Abstract: Maxwell stress tensor method was used to analyze the force on the interface between air gap and rotor. It was concluded that the cogging torque is generated by the tangential magnetic force on the interface between air gap and rotor. The expression of cogging torque was derived by combining Maxwell tensor method with electromagnetic field numerical calculation. The orthogonal experiment of three factors and four levels for permanent magnet was constructed, and the influence of design parameters of permanent magnet on cogging torque was obtained. The influence of pole arc coefficient on cogging torque was significant, the influence of magnetic pole eccentricity was second, and the influence of radial magnetization length was the smallest. The appropriate parameters were selected to optimize the shape of permanent magnet and reduce the influence of cogging torque..