针对大天区面积多目标光纤光谱天文望远镜(LAMOST)观测光纤扫描定位的需求, 设计了一种基于悬臂梁结构的惯性冲击直线压电马达, 分析了该压电马达的驱动机理。为避免共振, 采用有限元仿真法获得了振动座的一阶共振频率。设计加工了马达样机, 搭建了实验平台, 并进行了马达性能测试与分析。结果表明, 在预紧力为0.2 N, 驱动信号为锯齿波偏置一半, 当电压峰-峰值为60 V(600 Hz)时, 马达无负载速度为1.83 mm/s, 当电压峰-峰值是15 V时, 马达的位移分辨率为0.8 μm; 当预紧力为0.4 N, 驱动信号峰-峰值为60 V(600 Hz)时, 马达最大负载为0.18 N, 行程为40.5 mm。马达的性能参数符合光纤定位器扫描需求。

An inertial impact linear piezoelectric motor based on cantilever beam was designed to meet the requirements of optical fiber scanning and positioning during the observation of large sky area multi-target fiber spectroscopic telescope (LAMOST).The driving mechanism of the motor was also investigated.In order to avoid resonance, the first order resonance frequency of the vibrator was obtained by finite element simulation.The prototype motor was designed and fabricated, and an experimental platform was set up to validate the working principle and evaluate the performance of the motor.The results show that when the preload was 0.2 N and the driving signal was half of the sawtooth wave offset, the voltage peak-to-peak value was 60 V(600 Hz),the no-load velocity of the prototype motor reached 1.83 mm/s. The displacement resolution of the motor was 0.8 μm when the driving voltage peak-to-peak value was 15 V.The maximum load of 0.18 N and stroke of 40.5 mm were obtained under the driving signal peak-to-peak value of 60 V(600 Hz) and the preload of 0.4 N. The performance parameters of the motor meet the requirements of LAMOST′s fiber positioner scanning.