基于EKF的无传感器永磁同步电机控制器设计

Controller Design of Sensorless Permanent Magnet Synchronous Motor Based on EKF

针对永磁同步电机在应用中需要安装传感器以及在无位置控制中由于dq轴电流的交叉耦合而影响到系统的动态性能问题,提出了基于扩展卡尔曼滤波观测器的无位置永磁同步电机及电流解耦控制策略的电机控制系统。详细阐述了永磁同步电机的扩展卡尔曼滤波状态观测器的设计,以及基于EKF观测出来的状态变量进行电压前馈补偿电流解耦控制。研究结果表明:扩展卡尔曼滤波状态观测器可以很好的观测出电机的转速与位置信息,电流解耦控制策略可以减少系统响应时间,降低系统稳态误差,提高了系统的动态性能,满足了无位置永磁同步电机在实际应用中的控制需求。

For the problem which permanent magnet synchronous motor required to install sensors in the application , and the dynamic performance of the system was affected by the cross coupling of the DQ axis current in the sensorless control, a motor control system of sensorless permanent magnet synchronous motor based on extended caiman filter observer and current decoupling control strategy was proposed. The design of extended caiman filter state observer for permanent magnet synchronous motor and the voltage feed - for- ward compensation current decoupling control based on the state variable observed by EKF was described in detail. The results show that the extended caiman filter state observer can well observe the speed and posi- tion information of the motor and the current decoupling control strategy can reduce the system response time, reduce the steady - state error of the system, improve the dynamic performance of the system, which meets the control requirements in the practical application of sensodess permanent magnet synchronous motor.