行波超声电机定子的非线性振动(英文)

Nonlinear vibration of travelling wave ultrasonic motor stator

分析了超声电机定、转子间接触力的非线性特性引起的旋转型行波超声电机(TWUM)定子的非线性振动,以此为基础,建立了TWUM定子的非线性振动模型,并用KBM法求解了该模型。求解结果表明,定子的振动是非线性的,且会产生非线性的跳跃和迟滞现象,定子的非线性振动还会使TWUM输出的堵转力矩也出现跳跃现象。基于实验测得的TRUM空载转速的跳跃对定子的非线性振动进行了验证。在此基础上,对影响定、转子间接触力的几个因素进行了分析。分析结果表明,定子上的激励电压越高,施加在定、转子间的预压力越小,定、转子间相对滑动的摩擦系数越小;定子齿越短,摩擦材料越软,定子振动的非线性现象就越不明显,TWUM的运行稳定性就越好,TWUM的工作频带也就越宽。

The nonlinear vibration of stator in Travelling Wave Ultrasonic Motor （TWUM） caused by nonlinear properties of contact force between stator and rotor is analyzed. On the basis of this, a nonlinear vibration model The result shows that of TWUM stator is established, and the solution is gotten by the KBM method. stator vibration can cause nonlinear vibration jump and hysteresis phenomena, and can also influence TWUM output performance. These are validated by an experiment. Results indicates that the higher exciting stator voltages and the lower preload between stator and rotor are, the smaller friction coefficients between stator and friction material are; also the shorter stator tooth and the softer friction material are,the smaller stator nonlinear vibration, the more stable TWUM operation,and the broader working frequency band are.