一种低频大行程直线型压电电机的研究

基于叠层式压电陶瓷在低频带范围内的变形幅值大,与驱动电压线性度好且基本不随驱动频率变化的特点,提出并研制了一种低频大行程直线型压电电机.与共振式压电电机相比,该电机在低频范围内输出速度与驱动频率的线性度好,可控性较好.对电机的工作机理进行了分析,同时利用有限元软件对电机的结构进行设计,并试制了原理样机.实验结果表明,电机可在100 Hz～2 kHz的频带工作,其速度在100 Hz～1 kHz的频带内基本和频率成正比,最大空载速度为60 mm/min.

Research on a Linear Piezoelectric Motor Working in Low Frequency with Unlimit Travel Range

Based on characteristic of piezoelectric stack, such as the amplitude of displacement was big, linear to the driving voltage and almost the same at low frequency, a linear motor based on non-resonant vibration of piezoelectric ceramics stack was investigated. In contrast to the ultrasonic motor with resonant vibration, the speed of this motor was linear to the driving frequency and the control performance was more acceptable at low frequency. The working principle of the motor was presented. The structure was designed by finite element software. The motor could work in the frequency between 100 Hz and 2 kHz with virtually unlimited travel rang. And the highest no-load speed was 60 mm/min. In the frequency between the 100 Hz and 1 kHz, the speed of stator was linear to the driving frequency.