温度对超声波电动机起动阶段位移分辨率的影响

摘要

以微幅振动经摩擦驱动的超声波电动机,由于自身发热的作用,导致定子振动特性发生变化,进而对其位移分辨率产生显著影响.从超声波电动机用压电元件特性出发,分析了特性波动的因素.应用单片机作为控制器,测试了运行不同阶段温度下旋转型行波超声波电动机的位移分辨率.研究发现:在起动阶段,超声波电动机本体温度变化对压电元件性能影响是非线性的,它是超声波电动机分辨率波动的主要因素之一,为在起动阶段具有高分辨率的超声波电动机设计提供依据.%Ultrasonic motors were driven by micro vibration.Due to self-heating and ambient temperature,temperature leads to changes in the vibration characteristics of the stator.The stator vibration had a significant influence on displacement resolution.The start-up stability was analyzed focus on piezoelectric element.Single chip computer was used as controller,displacement resolution of the rotary traveling wave ultrasonic motor was tested at different temperatures.Fluctuations of resolution were decreased by using feed-forward control method.Research shows that piezoelectric element is one of the main factors affecting the performance of ultrasonic motor resolution in the start-up phase.The performance of the piezoelectric element is non-linear at different temperature.