Abstract
Recently, synchronous motor using reluctance torque is drawing the attention. Especially interior permanent magnet synchronous motor (IPM motor) is widely used for several industrial applications such as a compressor drive and an electric vehicle. However, the efficiency of IPM motor decreases at high speed and light load operation. Such problems can be improved by reducing magnetic flux and increasing reluctance torque. In this paper, we experimentally investigate machine performances of SynRM and IPM motors, including IPM mainly using reluctance torque. And we analytically examine efficiency characteristics of IPM motors at high speed and light load operation.
