斜动子与塔形定子构成的单驱双动超声电机

针对两相超声电机对模态频率一致性要求高及单相超声电机难于实现双向运动等问题,提出了一种单相驱动双向运动斜动子塔形直线超声电机。动子相对于塔形定子倾斜安装,利用塔形定子的面内对称模态或面内弯曲模态为工作模态,通过切换工作模态改变定子驱动足运动轨迹相对于动子的倾斜方向,实现动子正、反向运动。在分析电机工作原理及设计原则的基础上,推导了电机运行的导轨倾角适用范围,对设计制作的原理样机进行了模态实验和机械特性测试。实验表明,在导轨倾斜角为35°,激励电压为500 V,预压为力4.5 N的条件下,面内对称振动模态工作时的最大空载速度为79 mm/s,最大输出力为0.5 N;面内弯曲模态工作时的最大空载速度为756 mm/s,最大输出力为0.8 N。

A Single-Phase-Drive Bi-directional Moving Ultrasonic Motor Composed of an Inclined Slider and a Tower-Type Stator

In order to solve the problems that double-phase-drive type ultrasonic motors(USMs) need to equalize the two natural frequencies for driving and that single-phase-drive type USMs either only move unidirectionally,a single-phasedrive bi-directional linear USM composed of an inclined slider and a tower-type stator is presented.The inclined slider is installed with the stator which works under the symmetric vibration mode in one plane or the bending vibration mode in another plane.When the stator working mode is changed,the inclined direction of the driving-foot trajectory is changed,so the stator can move the slider bi-directionally.On the basis of analyzing the working principle and the design principles of the motor,the obliquity range of the inclined slider which can make the motor run normally is derived.Finally,a prototype is fabricated and the tests of vibration mode and mechanical characteristics are accomplished.The experimental results show that under the condition that the slider obliquity is 35° and the voltage is 500 Vp-p and the pre-pressure is 4.5N,when the motor is working under the symmetric vibration mode in one plane,the motor offers a maximal driving force of 0.5N,and the maximal velocity with no load is 79mm/s;and when the motor is working under the bending vibration mode in another plane,the motor offers a maximal driving force of 0.8 N,and the maximal velocity with no load is 756 mm/s.