1. Center for More Electric Aircraft Power System, College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China
2. Jiangsu Xingli Construction Group Co., Ltd, Nanjing, Jiangsu 211106, China
3. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China