Development of high torque density and efficiency vswitched reluctance motor with 0.1mm short airgap

This paper presents a development of switched reluctance motor (SRM) with 0.1mm airgap length by which high efficiency as well as high torque density can be expected as a 400W machine for servo drive application. A SRM with 0.1mm airgap length is designed by genetic algorithm-based optimum design approach so as to be compatible with an existing 400W permanent magnet synchronous servo motor from viewpoints of high efficiency and maximum torque capability under the equal outer dimensions and power converter ratings. The SRM designed is built and tested experimentally. As a result, it is demonstrated that the test machine realizes high efficiency more than 85% under the frequent operating conditions while satisfying the required maximum torque.