全速范围永磁同步电机无位置传感器控制研究

Research on No-Position Sensor Control of Permanent Magnet Synchronous Motor in Full Speed Range

针对滑模观测器在低速范围内的不适用性,以及中高速范围内高频注入法跟踪性能差的问题,采用一种复合控制策略实现永磁同步电机全速范围无位置传感器控制。为避免电机启动失败在零低速范围内采用带磁极辨别的高频脉振电压注入法;为减小传统滑模观测器的抖振,采用改进型滑模观测器在中高速范围内获取转子位置信息;为实现速度平滑切换采用一种非线性切换算法。仿真结果表明,采用的复合控制策略在全速范围可以精准获取转子位置信息,提高永磁同步电机运行的稳定性和控制精度。

In order to solve the problem of unsuitability of sliding mode observer in low speed range and poor tracking performance of high frequency injection method in medium and high speed range,a hybrid control strategy is adopted to achieve no-position sensor control of permanent magnet synchronous motor(PMSM)in full-speed range.In order to avoid the failure of the motor to start,the high-frequency pulse voltage injection method with magnetic pole discrimination is adopted in the range of zero and low speed;In order to reduce the chattering of the traditional sliding mode observer,an improved sliding mode observer is used to obtain rotor position information in the medium and high speed range;In order to achieve smooth speed switching,a non-linear switching algorithm is adopted.The simulation results show that the adopted compound control strategy can accurately obtain the rotor position information in the full speed range,and improve the stability and control accuracy of the permanent magnet synchronous motor.