Core Loss Reduction of Segment Stator Core Motor in Consideration of Rolling Direction of Non-Oriented Electrical Steel Sheet

This paper proposes core loss reduction of a surface mounted permanent magnet (SPM) motor with a segment stator core. First, it is shown that core loss of a motor is decreased by segmentation of a stator core made of nonoriented electrical steel sheet. The non-oriented electrical steel sheet used as the segment stator core has an anisotropy which is easy to magnetize in the rolling direction. Therefore, it is important to investigate core loss of the segment stator core in consideration of the rolling direction of electrical steel sheet. The rolling direction of the steel sheet can be taken into consideration in magnetic field analysis by using Enokizono & Soda (E&S) model which is one of the vector magnetic property utilization technique. Accordingly, the finite element method which introduced the E& S model is used in order to evaluate core loss of the motor. Secondly, core loss of the segment stator core is further reduced by applying corner radius to each tooth root. Finally, relation between core loss and the rolling direction in the segment stator core applying corner radius is investigated.