摘要
利用能量等效原则把环形压电复合定子等效成等直梁结构,综合考虑压电复合定子的机械损耗(包括压电陶瓷和金属基体的损耗)、转动惯量和剪切变形,利用铁木辛柯梁振动理论得到了压电复合定子在自由状态下的频率方程和受迫状态下的振动解析解;利用库仑摩擦接触理论建立了定、转子之间的力传递模型,探讨了接触角与定、转子预压力、振动幅值、摩擦材料弹性刚度之间的关系,给出了电机稳态时的输出力矩表达式,并分析了电机能量损耗的组成,通过把定、转子接触面的摩擦损耗和转子的输出功率等效为定子振动的弯曲阻尼损失,建立了电机的输出效率表达式,从而系统地建立了基于能量等效的行波型超声波电动机特性的解析模型。
The simplified equivalent composite beam model of the stator was obtained ; the frequency - equation and the equation describing the amplitude of transverse vibration were established by Timoshinko beam theory. And then by using the Coulomb friction law, the force transfer model of the contact surface between the stator and the rotor was derived; the interrelationship between contact angles, the frictional material characteristic, the preload and the vibration amplitude were analyzed. According to the energy equivalent principle, the friction loss between the contact surface and the outputting power of the rotor regarded as one of the parts of the equivalent damp loss of the stator vibration were applied to achieve the efficiency of the TWUSM.
出处
《微特电机》
北大核心
2008年第4期18-21,共4页
Small & Special Electrical Machines
关键词
行波型超声波电动机
能量等效
数学模型
traveling - wave type ultrasonic motor （ TWUSM ）
energy equivalent
mathematical model
