【摘要】 压电陶瓷存在迟滞现象,开环定位精度受到严重影响。本文提出一个能够精确描述迟滞现象的数学模型,通过实验发现压电陶瓷迟滞曲线由转换电压决定。提出基于这个迟滞模型的开环逆控制方法,压电陶瓷迟滞减少至1%以内,控制性能显著提高。更多还原

【Abstract】 A major deficiency of piezoelectric actuators is that their open-loop control accuracy is seriously limited by hysteresis.In this paper,a novel mathematical model is proposed to describe hysteresis precisely and a new parameter called turning voltage is introduced.It was found experimentally that the shapes of hysteresis curves are decided by the value of the turning voltage.A computer-based inverse control approach under open-loop operation based on the mathematical model was applied to suppress the inherent hysteresis to within 1%full span range of a stack piezoelectric actuator and the performance of the piezoelectric actuator is noticeably improved.更多还原