Sensorless Control for Unsymmetrical Bistable Multimagnetic Circuit Permanent Magnet Actuator Based on High-Frequency Signal Injection and High-Pass Filter Circuit. - Guanbao Zeng; Xiangyu Yang; Haoyong Yu; Yiyang Jing; Shiwei Zhao; Jianghua Cao; Qing Chen; Mengzhen Gao; Zifan Zhang (IEEE Trans. Ind. Electron., 2022)