基于一种新型滑模观测器的永磁同步电机无传感器控制

Senorless control of PMSM based on a novel sliding mode observer

永磁同步电机无传感器控制中,需要实现电机转速和位置的估计,为了克服传统滑模观测器存在的不连续控制而导致的严重抖振问题,在分析传统滑模观测器原理的基础上,把Sigmoid函数引进了传统滑模观测器,设计了一种新型的滑模观测器并证明了其稳定性。仿真试验结果表明:基于Sigmoid函数新型的滑模观测器消除了传统滑模观测器存在的严重抖振,减少了滤波环节和相位补偿环节,能够实现对PMSM的速度和位置的精确估计;同时基于该方法的永磁同步电机无传感器控制策略是有效的。

For the sensorless control of permanent magnet synchronous motor （PMSM）drive system, it is necessary to estimate the information of speed and position online. In order to reduce the chattering problem commonly found in the conventional sliding mode observer, based on the analysis of the principle of the conventional sliding mode observer, this paper introduces the sigmoid function into the sliding mode observer and designs a novel sliding mode observer, then proves the stability of the system. The imitational and experimental results show that： the novel sliding observer can reduce the chattering and save the low pass filters and phases compensator, which can estimate exactly the speed and position of the rotor of permanent magnet synchronous motor; at the same time, the sensorless control scheme of PMSM based on the novel observer is valid.