预压力对纵扭复合压电超声马达共振频率影响的研究

Study on resonance frequency of the longitudinal-torsional ultrasonic motor by prestress

研究了预压力对超声马达共振频率的影响.通过对纵扭复合型压电超声马达运行机理的研究,分析了预压力与纵扭复合型压电超声马达纵扭振子输出压电应力协同作用的机理.理论和实验研究结果表明,纵纽复合型压电超声马达的共振频率随预压力增加而增加;马达预压力和共振频率存在正比关系.理论分析和实验测试结果符合较好.

The infuence on resonance frequencies of longitudinal-torsional ultrasonic motor exerted by prestress is studied. The coordinative mechanism of prestress and longitudinal-torsional ultrasonic transducer＇ s output is analyzed through the motion of longitudinal-torsional ultrasonic motor, The changing basis of the relations between prestress and its resonance frequency has been found. Experiment results show that the measured resonance frequencies are in good agreement with the theory.