基于非线性观测器的永磁同步电机位置估计算法研究

Research on Position Estimation Algorithm of Permanent Magnet Synchronous Motor Based on Nonlinear Observer

为提高表贴式永磁同步电机无位置传感器控制中转子位置和速度的估计精度,提出了一种改进型非线性观测器。通过重构非线性观测器的数学模型,构建了误差方程,利用Lyapunov理论对误差方程进行了稳定性分析。并基于稳定性条件提出了一种误差项步长优化方法,实现了非线性观测器的步长增益自调节。仿真与试验结果表明,改进型非线性观测器具有良好的动态性能,验证了其可行性。

In order to improve the estimation accuracy of rotor position and speed for sensorless control of the surfacemounted permanent magnet synchronous motor,an improved nonlinear observer is proposed.By reconstructing the mathematical model of the nonlinear observer,the error equation is constructed,and the stability of the error equation is analyzed by using Lyapunov theory.Based on the stability condition,an error step-size optimization method is proposed to realize the self-regulation of the step gain of the nonlinear observer.The simulation and experiment results show that the improved nonlinear observer has good dynamic performance,and the feasibility is verified.