旋转行波超声电机最优预压力的研究

为提升旋转行波超声电机输出性能,研究其在不同负载下的最优预压力,针对TRUM-70H超声电机进行了理论计算和实验验证。建立超声电机动力学模型,分析了预压力对超声电机机械特性的影响;以TRUM-70H超声电机为对象,分析其最优预压力与负载力矩间的关系;搭建超声电机多功能测试平台,验证理论推导结果,并指出误差存在的原因;根据研究结论,提出超声电机装配时应根据负载选用预压力。结果表明,预压力和负载力矩对超声电机转速的影响存在耦合关系;在超声电机有效工作范围内,最优预压力值与负载力矩近似呈线性正相关;装配时根据实际负载需求设定超声电机预压力,可提高其输出效率。

Study on Optimal Pre pressure of Rotating Traveling Wave Ultrasonic Motor

In order to improve the output performance of the rotating traveling wave ultrasonic motor and study on the optimal pre pressures under different loads, the theoretical calculation and experimental verification on TRUM 70H ultrasonic motor were carried out. The dynamic model of ultrasonic motor is established, and the influence of pre pressure on the mechanical properties of ultrasonic motor is analyzed. Taking the TRUM 70H ultrasonic motor as the object of study, the relationship between the optimum pre pressure and the load torque is analyzed. A multi functional testing platform for ultrasonic motor is built to verify the theoretical derivation results, and the reason for the error is also pointed out. According to the conclusion, the pre pressure should be selected according to the load when the ultrasonic motors are assembled. The results show that there is a coupling relationship between the pre pressure and the load torque on the speed of the ultrasonic motor. In the effective working range of the ultrasonic motor, the optimum pre pressure is approximately linearly positively correlated with the load torque. When the pre pressure is set according to the actual load demand during assembly, the output efficiency of the ultrasonic motor can be improved.