Cogging torque analysis of the PMSM for high performance electrical motor considering magnetic anisotropy of electrical steel

Abstract

This paper deals with torque and cogging torque analysis of interior permanent magnet (IPM) motor considering anisotropy of electrical steel sheets. Generally, cogging torque is caused by tooth and slot structure in permanent magnet motor. But, magnetizing direction of iron core is changed by each rolling position in the manufacturing process of iron core. In this paper, analysis of cogging torque presents effects of not tooth and slot structures but rolling direction of iron core. It is useful to apply precise electrical motor as EPS.