Funding for this research was provided by:
National Natural Science Foundation of China (51577048, 51877070, 51637001)
Natural Science Foundation of Hebei Province of China (E2018208155)
Hebei Province Higher Education Science and Technology Research Key Project (ZD2018228)
High-energy-saving motor and control technology National and Local Joint Engineering Laboratory Open Project Funded Project (KFKT201804)
Hebei Province Graduate Innovation Funding Project (CXZZSS2018085, CXZZSS2019084)
Article History
Received: 13 February 2019
Revised: 21 May 2019
Accepted: 16 July 2019
First Online: 22 July 2019