基于扩展卡尔曼滤波观测器的无刷直流电机无位置传感器控制系统研究

Research on Sensorless Control System of Brushless DC Motor Based on Extended Kalman Filter Observer

为了解决无刷直流电机无位置传感器控制中传统反电势法存在的系统噪声和测量误差导致观测不准确的问题,提出一种基于扩展卡尔曼滤波观测器的无刷直流电机无位置传感器控制,该方法运用扩展卡尔曼滤波器得到的线反电势对无刷直流电机的转子速度和转子的位置进行估计。Matlab仿真和实验结果表明,基于扩展卡尔曼滤波观测器所获得的无刷直流电机的转速和位置信号误差小,精度高,应用于无刷直流电机无位置传感器系统时运行稳定,具有良好的稳态与动态性能,抗干扰能力强。

In order to solve the problem of inaccurate observation caused by system noise and measurement error in the traditional back EMF method of brushless DC motor without position sensor control,a position sensorless control of brushless DC motor based on extended Kalman filter observer was proposed.The method used the back EMF of the extended Kalman filter to estimate the rotor speed and rotor position of the brushless DC motor.The simulation and experimental results of Matlab show that the speed and position signal of the brushless DC motor obtained by the extended Kalman filter observer is small and the precision is high.It is stable and stable when applied to the brushless DC motor position sensorless system,state and dynamic performance,strong anti-interference ability.