音圈电机推力迟滞特性研究

Research on Hysteresis Characteristics of the Thrust of Voice Coil Motor

为实现音圈电机推力的精确控制,基于Preisach模型对音圈电机的推力迟滞特性进行了建模,构建了音圈电机的推力迟滞逆模型,并设计了开环逆补偿器,对有逆补偿器和无逆补偿器的音圈电机进行了推力特性试验.结果表明,有逆补偿器的音圈电机推力迟滞环明显小于无逆补偿器的音圈电机.且有逆补偿器的音圈电机推力最大绝对误差为0.2 N,相对误差基本维持在3%以内.无逆补偿器的音圈电机推力最大绝对误差达到了0.75 N,相对误差变化较大,补偿后推力绝对误差最大降低了73%.

The thrust control accuracy was reduced by the hysteresis characteristic of the voice coil motor(VCM) and the pressure accuracy of a valve controlled by VCM is restricted. In order to achieve the precise thrust control of VCM, a thrust hysteresis model based on Preisach model was proposed. The feasibility of the model was verified by experiment. An inverse hysteresis model of VCM was established and an open-loop inverse compensator was designed. The thrust experiments of VCM with inverse compensator and without inverse compensator were carried out. The results indicate that the hysteresis loop of VCM with inverse compensator is significantly smaller than VCM without the compensator. The maximum absolute error of VCM with inverse compensator is 0.2 N, and relative error is basically maintained within 3%. That of VCM without inverse compensator reaches 0.75 N, and relative error varies greatly. The magnitude of change in the thrust absolute error after compensation is reduced by 73%. The hysteresis characteristic of the thrust of VCM is effectively compensated by the inverse compensator, and the thrust control accuracy is improved.