T型直线超声波电动机的运行机理及其特性分析  

Operating Mechanism and Characteristics Analysis of a T-Shaped Linear Ultrasonic Motor

作　　者：王光庆[1] 徐文潭 杨斌强[1] 

机构地区：[1]浙江工商大学信息与电子工程学院,杭州310018

出　　处：《电工技术学报》2017年第15期111-119,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51277165);浙江省自然科学基金(LY15F010001);浙江省教育厅(Y201223050)资助项目

摘　　要：提出了一种新型T型直线超声波电动机,利用PZT d31模式激发压电双晶悬臂梁产生纵向振动,并通过驱动足与滑条间的摩擦作用带动滑条作直线运动。研究了电动机结构和运行机理,采用有限元方法对T型直线超声波电动机定子进行了建模和分析;利用冲量定理和力平衡原理建立电动机定子和滑条接触面力传递模型,仿真分析了不同预压力作用下电动机的速度-推力输出特性,实验验证了仿真分析结构的正确性。实验结果表明,在激励电压幅值Vpp为200 V和激励频率为23.75 k Hz作用下,电动机在预压力为50 N时的空载直线速度达到250 mm·s-1,在预压力为200 N时的最大推力达到7.6 N。A novel T-shaped linear ultrasonic motor was proposed. The d31 mode of the PZT was used to excite the bimorph cantilever beams to generate a longitudinal vibration, which can push the slider to move in a straight line with the friction force between the driving feet and the slider. The general structure and operating principle of the new motor were introduced at first. Then the stator of the T-shaped linear ultrasonic motor was modeled with the finite element method （ FEM） , and the force transferring model of the contact surface between the stator and the slider was established based on the impulse theorem and the force equilibrium law. With this model, simulations on the speed-thrust characteristics under different pre-load were performed, and the validity of the model was testified by the experimental results. Experimental results show that when the motor is excited by a voltage with peak-peak amplitude of 200 V and frequency of 23. 75 kHz, the no-load speed of the motor reaches 250 mm ＊s 1 when the pre-load is 50 N, and the maximum thrust reaches 7. 6 N when the pre-load is 200 N.

关 键 词：直线超声波电动机 压电双晶悬臂梁 T型结构 运行机理 d31模式 力传递模型 

分 类 号：TM356[电气工程—电机]