一种基于压电叠堆的微型直线超声波电动机研究

摘要

对已有的直线超声波电动机进行改进,研究了一种新的微型直线超声波电动机,采用了压电叠堆,具有低驱动电压结、构简单、装配方便的特点.压电叠堆通过自主设计完成.电机定子使用对称和反对称模态作为工作模态,在ANSYS软件中使用有限元方法分析了电机定子的对称和反对称2种模态频率对其结构参数的灵敏度,并对其进行调整,以使得定子的对称和反对称模态频率保持一致.对电机定子进行了模态测试,实验结果与理论分析基本一致.对样机进行了性能实验, 当实验条件为激励电压15 V、频率38kHz 时,样机的无负载最大速度为30 mm/s,最大推力为2.2 N.通过微型化改进,电机定子最大推重比从97 N/kg增加到157 N/kg.%To improve the existing linear ultrasonic motor,a novel linear ultrasonic motor which was based on piezoelec-tric stack was proposed, and the motor had the characteristics of low drive voltage, simple structure and convenient assem-bly.The piezoelectric stack used in the motor was completed by independent design.The symmetric and anti-symmetric mode were utilized as operating modes.The finite element method was used to analyze the symmetric and anti-symmetric mode frequency to all structure parameters in ANSYS software and the frequency consistency of the symmetric and anti-symmetric mode was adjusted.The mode testing showed that theexperimental results were consistent with the theoretical re-sults.The performance testing of the motor showed that the motor could offer the maximum velocity of 30 mm/s and the maximum thrust force of 2.2 N in the condition of driving voltage 15 V, frequency 38 kHz.After miniaturization improv-e ment,the maximal thrust force per unit weight of the motor was increased from 97 N/kg to 157 N/kg.