大力矩应力型纵扭复合超声电机

研究了一种双转子应力型纵扭复合型超声电机,对该电机进行了结构设计,提出了纵振压电陶瓷片全部放置在定子端面上的结构,同时深入分析了电机的工作机理。利用有限元分析软件ANSYS详细分析了影响定子1阶扭振模态和电机整体2阶纵振模态的结构参数,并提出了针对应力型纵扭复合超声电机的模态频率一致性的设计方法。对研制出的Φ20 mm双转子应力型纵扭复合超声电机样机进行了振动特性以及使用不同预压力弹簧时的负载特性实验研究,结果表明:电机的纵振特性与施加在转子上的预压力有关;使用非线性预压力弹簧时,电机输出负载特性较好,其中Φ20 mm样机的堵转力矩达到了1.28 N.m。

Stress-Type Hybrid Ultrasonic Motors Using Longitudinal and Torsionali Vibration Modes with Large Torque

A kind of stress-type hybrid ultrasonic motors using longitudinal and torsional vibration modes(LTUM) is developed.Structure designs are carried out to the stress-type LTUM.It is put forward that the longitudinal PZT should be placed on the surface of the stator,and the operating mechanism of the motor is analyzed.The FEA software ANSYS is used to analyze the structure parameters which affect the 1st torsional vibration mode and the 2nd longitudinal vibration mode and the method to realize the frequency coherence between the 1st torsional vibration mode and the 2nd longitudinal vibration mode is proposed.The vibration and mechanical experiments for the stress-type LTUM with two rotors show that when the non-linear spring is used for applying pre-pressure,the load characteristics of the motor is better and the stalling torque of the motor with diameter in 20mm has reached 1.28 N·m.