Research on Sensorless Algorithm of Two-Phase Tubular Permanent Magnet Synchronous Linear Motor
Zhang Chunlei1,2, Zhang Hui1,2, Ye Peiqing1,2, Zhang Luhong1,2
1. Department of Mechanical Engineering Tsinghua University Beijing 100084 China; 2. Beijing Key Laboratory of Precision /Ultra-Precision Manufacturing Equipments and Control Tsinghua University Beijing 100084 China
Abstract：Due to the existence of longitudinal end effect and magnetomotive force harmonics, the inductance of two-phase tubular permanent magnet synchronous linear motor (TPMSLM) isn’t ideal. So the traditional sensorless algorithm based on the high-frequency voltage injection doesn’t work. To solve the problem, the inductance of two-phase TPMSLM was studied by the finite element method in the condition that the mover and stator windings were fully coupled. Then the high-frequency voltage model of two-phase TPMSLM in the stationary reference frame was derived from the actual inductance. The estimated position was extracted by the extended Kalman filter (EKF) . As a result, the sensorless control using the proposed method provides an enhanced dynamics. At last, the proposed algorithm was verified by experiment.
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2019, Vol. 34 
