Optimum design of a multi layer interior permanent magnet synchronous motor using reluctance torque

Abstract

This report analyzes the results of experiments done with an inverter drive interior permanent magnet (IPM) motor. We examine results of both FEM (Finite Element Method) simulation and experiments using a prototype motor with identical conditions set for stator and for magnet volume. The results indicated that with magnets implanted inside the rotor, the values for the d-axis inductance of the motor remained roughly the same, unaffected by shape or number of layers. However, the q-axis inductance exhibited significant change. This research report compares an IPM motor having two layers of permanent magnets with a motor having a single layer. The dual layer shows a 30 percent or greater increase in torque using the same current. These results indicate that this motor is especially effective for such applications as robots, plant machinery, compressor motor, and electric vehicles.