[1] Beijing Inst Technol, Sch Mechatron Engn, Beijing 100081, Peoples R China
[2] North Univ China, Sch Shuozhou, Taiyuan 030051, Shanxi, Peoples R China
[3] North Univ China, Natl Key Lab Elect Measurement Technol, Taiyuan, Shanxi, Peoples R China
[4] Islamic Azad Univ, Majlesi Branch, Dept Elect Engn, Esfahan, Iran