[1] Zhejiang Univ, Coll Elect Engn, Hangzhou 310027, Peoples R China
[2] Univ Nottingham Ningbo, Nottingham Electrificat Res Inst, Ningbo 315100, Peoples R China
[3] Univ Nottingham Ningbo China, Key Lab More Elect Aircraft Technol Zhejiang Prov, Ningbo 315100, Peoples R China
[4] Yongjiang Lab, Adv Elect Drive Ctr, Ningbo 315202, Peoples R China
[5] Univ Nottingham, Nottingham NG7 2RD, England