Characteristics and Design of an SRM using Grain-Oriented Electrical Steel Sheets

Abstract

The switched reluctance motor (SRM) has generated considerable attention because of its lack of magnets and lower cost structure compared to the permanent magnet synchronous motor (PMSM) structure. In addition, SRM can achieve high speed rotation because of its simple structure and high robustness. However, SRM has lower torque density than that of PMSM. To increase the torque density in SRM, a grain-oriented electrical steel sheet (GO) can be applied as the stator and rotor materials. The magnetic characteristics of GO fluctuate depending on the angle between the rolling direction and magnetic flux direction. In a previous research, it was confirmed that three kinds of torques are output when the stator and rotor materials use GO. In this paper, three kinds of torques are explained, and a design concept of an SRM using GO is proposed. In addition, the static and dynamic torque characteristics of the proposed SRM are verified by simulation and experiment.