摘要
液体媒质超声波电机定转子不直接接触,而是利用液体将定子振动的机械能传递给转子,从而克服了接触型超声波电机的不足,是超声波电机一个新的研究方向。本文针对液体媒质超声波电机与接触型超声波电机能量传递方式上的不同,建立了电机定子有限元模型,通过定子模态、谐响应和电压激励时的动态分析,获得了电机的振动频率及接触面上定子质点的运动轨迹,在此基础上讨论了定子振动对电机运行特性的影响,并研究了压电片引起的定子振动的变化,给出了压电片厚度与振动幅值及谐振频率的关系曲线。最后测量了不同电压频率、不同液面高度时电机的转速,实验结果验证了理论分析的正确性。
The ultrasonic motor driving fluid directly solves some problems of the contact ultrasonic motors. Its stator doesn＇t contact with the rotor and the energy of the stator is transferred to the rotor through fluid medium. It becomes a new research direction in the field of the ultrasonic motors. Concerning differences of the stator vibration mode and the way of energy transfer from contact ultrasonic motor, a motor finite element model was presented in the paper. Through the modal analysis, harmonic response analysis and transient dynamic analysis when the motor is excited by voltage, the vibration frequency and the motion traces of some stator points were obtained, and the influence of stator vibration to motor running was discussed. The changes of the vibration frequency and amplitude produced by piezoceramic ring were studied in the paper, and the importance of choosing the appropriate thickness of piezoceramic ring was pointed out. In the end, the motor speed was measured when the voltage frequency and fluid height varied. The experimental results coincide with theory analysis.
出处
《电工技术学报》
EI
CSCD
北大核心
2006年第10期17-21,共5页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(50207006)
高等学校博士点学科专项科研基金(20040056021)
天津市自然科学基金(053603311)资助项目。
关键词
超声波电机
液体媒质
有限元分析
振动
Ultrasonic motor, fluid medium, finite element analysis, vibration
