基于滑模观测器的永磁同步电动机无传感器控制策略

Sensorless Vector Control of Permanent Magnet Synchronous Motor Based on Sliding Mode Observer

在现有的滑模观测器(SMO)的基础上,将滑模的切换函数由传统的开关函数改进为饱和函数,设计一种截止频率可变的低通滤波器,建立一种基于新型SMO的永磁同步电动机(PMSM)无位置传感器矢量控制策略,并进行基于该SMO的无传感器控制系统在抖动方面有显著的降低,并且其在恒速、变速和负载扰动环境下,静动态稳定特性较好,调速范围宽、鲁棒性较强。

A sensorless vector control of a permanent magnet synchronous motor （PMSM） is established based on a novel sliding mode observer （SMO） which is different from the traditional SMO. The sliding mode switch function uses the saturated function instead of the switch function. Meanwhile, a low pass filter with a cut off frequency changing with the rotor speed is designed. The experiments are implemented on the platform. The experimental results show that the sensor less vector control of the PMSM based on the novel SMO has a significant decrease in jitter. The features of the static and dynamic stabilities are better in the conditions of a constant speed, a variable speed and a load disturbance. Furthermore, the speed sensorless vector has the characteristics of a wide speed range and robustness.