关键词: 永磁直线同步电机, 二阶广义积分器, 高频方波电压注入法, 正交锁相环

Abstract: Aiming at the position sensorless control technology of permanent magnet linear synchronous motor, in order to solve the problem that the traditional high-frequency square wave injection method could not accurately locate the rotor position and speed, a position sensorless control method based on SOGI high-frequency square wave voltage injection was proposed. Different from the traditional high-frequency square wave voltage injection method, in order to obtain better highfrequency current signals, a second-order generalized integrator was used to extract the response high-frequency current signals. Orthogonal PLL was used to solve the problem of inverse tangent function without feedback directly amplifying noise. To prove the effectiveness of the position sensorless control technique, Simulink simulation was used for verification. The results show that the position sensorless method based on SOGI high frequency square wave voltage injection can greatly reduce the error, shorten the adjustment time and improve the response time.

Key words: permanent magnet linear synchronous motor ( PMLSM), second-order generalized integrator ( SOGI ), high-frequency square wave voltage injection technique, orthogonal phase-locked loop