车用 PMSM 无位置传感器控制的瞬态性能提升方法

A speed loop optimization strategy based on cascaded extended state observer（ESO）is pro⁃ posed to address the insufficient transient response of permanent magnet synchronous motor（PMSM）for steering power oil pump application in pure electric commercial vehicles. An extended Kalman filter（EKF）is designed as the basis of position sensorless control，with the adaptive design to avoid the problems of complicated parameter tun⁃ ing and slow convergence. The anti-disturbance and tracking ability of the speed loop is improved by the cascaded observation of internal and external disturbances，and the use of the linear state error feedback control rate（LSE⁃ FC）for replacement of the traditional PI controller. The bench tests show that the sensorless control scheme pro⁃ posed in this paper significantly reduces the position estimation error under dynamic and steady-state conditions，with a steady-state error of only 1.4°. The optimized speed loop control effectively improves the system's perfor⁃ mance of disturbance rejection and transient response. The reliability test shows that the steering power motor con⁃ troller operates stably without performance failure.