基于高通谐振滤波器的高频脉振电流注入法研究

当高频脉振电流注入法利用电机的凸极效应实现无位置传感器控制时,为了避免注入信号幅值选取的不当,导致提取转子位置信息的高频响应信号解调失败和转矩脉动,提出一种将高通谐振滤波器引入转子位置提取通道的方法。利用高通谐振滤波器在低频段的高度衰减性,在谐振点对解调信号放大增幅的特性,提高了含有转子初始位置信息的信噪比。对转子位置信号的滤波优化,使得电机无位置算法在解调响应信号的难度降低,转子位置和转速的估算可以实现零误差。最后通过仿真对比研究验证了方法的正确性和有效性。

Research about High-frequency Pulsating Current Injection Based on High-pass Resonator Filter

When sensorless control is realized in the high-frequency pulsating current injection method by means of saliency effect of the motor, to avoid demodulation failure of the HF response signal for extraction of rotor position information and torque ripple due to improper selection of the amplitude of injection signal,this paper presents a method for importing the high-pass resonator filter into the motor position extraction channel.Its principle is to take advantage of high attenuation of the high-pass resonator filter in the low frequency range as well as amplification of demodulated signal at the resonance point to raise the signal-to-noise ratio of the information containing original rotor position.This approach optimizes filtering of the rotor position signal so that it is not so difficult to demodulate the response signal by sensorless motor algorithm,and zero error can be realized in the estimation of rotor position and speed.Finally, simulation and comparison verify the correctness and effectiveness of the proposed approach.