大功率永磁低速同步电机的无传感器控制

Sensorless Control for High-power Permanent Magnet Low-speed Synchronous Motor

为了满足大功率永磁同步电机(PMSM)在低速运转时实现无传感器控制的需要,研究了一种新型的滑模观测器(SMO)方法。采用SMO对d,q坐标系下的感应电动势进行估算,并结合锁相环(PLL)原理得到转子位置和速度,同时基于Lyapunov函数分析了SMO参数的收敛性,并对滑模增益的选择进行了分析,该方法解决了传统SMO算法在极低速下无法实现的问题。实验结果表明,该方法能准确计算出电机的转子位置和速度,使系统具有良好的稳态精度和动态性能。

A siding mode observer（SMO） strategy is proposed to estimate rotor speed and position, which satisfies the needs of low-speed range implement for high-power permanent magnet synchronous motor（PMSM）.In this method, induction EMF of d, q reference frame is estimated by using SMO and phase locked loop（PLL） technology is employed to get rotor position and speed.The switch gain of SMO and system stability are studied on basis of Lyapunov function, and the method solves the problem of traditional SMO can＇t achieve in the ultra low speed range.Experimental results show that the proposed method can precisely estimate the position and speed of the rotor, and the system has good dynamic and static performances.