摘要
纵扭复合型超声波电机比其他超声波电机更具低速大力矩的特点,可以直接驱动负载,适合航空航天领域的应用。不过由于纵、扭振动在定子中的传播速度不一样,其纵、扭两相谐振频率的调谐一直是个难题。提出一种新型的中空结构的径向-扭转振动复合型超声波电机,采用一对纵振压电陶瓷和一对扭振压电陶瓷的组合方式,利用了径向一阶振动模态和扭振一阶振动模态,并通过电机定子的中空结构和尺寸的调整,使径向和扭转两相基频一致。首先从理论上分析了此方案的可行性,即提出了两相调谐的方法,并对以前的模型加以改进,然后根据理论分析制作了Φ60 mm的样机,经过试验,发现其性能满足设计要求,样机的最高转速为40 r/m in,堵转力矩为3.2 N.m。研制的超声波电机较其他电机具有轴向尺寸小和重量轻等特点,可以减小质量40%。
A longitudinal-torsional hybrid type ultrasonic motor offers bigger torque and lower revolution speed with respect to other kinds of ultrasonic motors , but it is difficult to adjust longitudinal and torsional phase at a particular frequency . A newly radial-torsional vibration hybrid type ultrasonic motor with hollow structure is put forward , which has one longitudinal piezoelectric ceramic element and one torsional piezoelectric ceramic element. It’s easy to make frequencies of two phases the same and take use of vibration power . The former model is improved and a Φ 60 mm prototype is fabricated . The obtained experimental results verify the basic principle of the motor. The no-load velocity and maximum torque for a typical motor are 40 r/min and 3.2N·m . This kind of motor is smaller and lighter than the former ones.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第9期162-163,共2页
Journal of Vibration and Shock
基金
国防科研项目资助
