Sensorless-oriented design of IPMSM

This paper deals with the design of a concentrated-winding interior permanent magnet synchronous motor (IPMSM) under saliency based-sensorless drive with a high-frequency signal injection for a general industrial application. Compared with distributed-winding IPMSMs, the serious disadvantages of concentrated winding IPMSMs are the narrow sensorless operating region and large torque ripple. To solve the problem, a novel rotor flux barrier design is proposed. The proposed rotor include its V-shape PM arrangements and circular flux-barriers at the rotor-yoke in the center of the N-pole and S-pole. The IPMSM designed is built and tested experimentally. As a result, it is demonstrated that the test machine realizes low-torque ripple under the frequent operating conditions while satisfying the required maximum torque under the sensorless drive.