超声电机定子热机电耦合特性

应用于极端环境的超声电机会受到温度场、应力场和电场的共同作用,定子在热机电耦合激励下的响应与电机工作特性密切相关.以行波型旋转超声电机为对象建立定子的能量泛函,采用假设模态的方法得到了热机电耦合动力学模型.运用有限元方法对热机电耦合作用下的定子进行仿真,分析了与理论计算结果的差异.建立了定子热扫频试验平台和热变形试验平台,测定温度对定子稳态形变、模态频率和振幅的影响,对理论模型的分析方法进行了评价.理论分析和试验结果揭示了超声电机定子在热机电耦合作用下的振动行为的变化规律,为下一步极端环境超声电机的设计和优化提供了依据.

Characteristics of the thermopiezoelectric stator of an ultrasonic motor

An ultrasonic motor may be driven in some extreme hot or cold environment,and it will be affected by the structural,electric and thermal coupled fields.The performance of the ultrasonic motor is closely related to the response of the stator stimulated by the coupled thermopiezoelectric forces.This paper presents theoretical and experimental results of coupled fields' effect on the stator of a traveling-wave rotary ultrasonic motor.The energy functional equations of the stator were investigated and the coupl...