High speed performance of PM machine with reconfigurable winding

This paper examines high speed performance of a permanent magnet (PM) machine with a reconfigurable winding (RW). First, the variations of machine parameters due to winding reconfiguration are presented and their impacts on drive system performance are investigated. To further understand system behavior, the reconfigurable ratio is set as a variable, and its effect on saliency ratio, flux weakening range, torque, output power and losses are studied in detail. Saturation effect is also taken into account. To verify the simulation analysis, a PM machine with reconfigurable winding was built and tested in a lab. The test results show that RW system can achieve up to 84% power boost with 57% copper loss reduction in high speed.