基于MRAS的永磁同步电动机无位置传感器控制

Position Sensorless Control of Permanent Magnet Synchronous Motor Drive System Based on MRAS

为了实现永磁同步电动机(PMSM)无位置传感器控制,提出了一种基于永磁同步电动机两相静止α-β坐标系下PMSM数学模型的模型参考自适应(MRAS)位置估算算法。该算法利用α-β坐标系下的α轴和β轴电压、电流及其偏差,借助Lyapunov稳定性理论建立了PMSM位置估算模型,并根据该理论推导出位置参数的自适应率,保证了位置估算模型的稳定性和误差的收敛,同时快速有效地估算出了转子位置。仿真和实验结果证明了该位置估算算法的可靠性和有效性。

In order to achieve the position sensorless control of permanent magnet synchronous motor（ PMSM）,a model reference adaptive system（ MRAS） method which was based on the PMSM mathematical model in α- β reference frame was put forward. In this method,the PMSM position estimation model was established according to the Lyapunov stability theory,using α- axis and β- axis voltage,current,and their errors in α- β reference frame. The adaptive ratio of the positional parameter was deduced by means of Lyapunov stability theory,ensuring the stability of position estimation system and the convergence of error,and at the same time the position of PMSM rotor can be quickly and efficiently obtained. The simulation results show the reliability and effectiveness of this method.