Technologies for High Efficiency Electric Motors

This chapter focuses on the main electric motor technologies to increase the efficiency of variable speed applications such as permanent magnet motor (interior PM, surface PM, hybrid PM), synchronous reluctance motor, line-start PM motor, switched reluctance motor, transverse flux motor, and axial flux motor. In order to understand the advantages of different motor technologies and their feasibility for variable speed application, a comparison between the main characteristics of permanent magnet motors (IPM, SPM, and HSM), synchronous reluctance motors, and induction motors are presented, considering the induction motor as reference.