ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,531,498, issued on Jan. 20, was assigned to ZHEJIANG UNIVERSITY OF TECHNOLOGY (Zhejiang, China).

"Sensorless control method of permanent magnet synchronous motor" was invented by Jianfeng Mao (Zhejiang, China), Yinghao Hu (Zhejiang, China), Xu Zhang (Zhejiang, China), Fujiong Zhao (Zhejiang, China), Hongjin Chen (Zhejiang, China) and Yuchen Wang (Zhejiang, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A sensorless control method and a system for PMSM based on Luenberger observer. The system includes a power supply circuit, a sampling circuit, a main control circuit and a drive circuit. The power supply circuit supplies power to other circuits. Th...