新型纵扭压电电机接触模型研究  

Contact model of a novel longitudinal and torsional ultrasonic motor

作　　者：李冲[1] 鹿存跃[1] 马艺馨[1] 黄卫清[2] 

机构地区：[1]上海交通大学仪器科学与工程系,上海200240 [2]南京航空航天大学精密驱动所,南京210000

出　　处：《振动与冲击》2016年第22期108-113,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(11174206);航空基金(20120657004);SAST基金(SAST201347);海洋工程国家重点实验室(1410)

摘　　要：提出一种新型贴片式纵扭压电电机,包含定子,转子和预压力系统等。电机定子经过特殊的开槽处理形成多振子结构,振子由金属基体和粘贴在其外表面的压电陶瓷构成,益于简化电机结构。通过合理的参数调整,使定子的一阶纵振模态和二阶扭转模态频率尽可能相同,并且振子均工作在共振状态,提高了电机效率。为评估设计电机的整体性能,建立了定子和转子的有限元接触模型,并对电机的接触特性进行分析研究。通过接触静态和瞬态求解,得到空载情况下接触区的压力分布、接触状态及滑动距离等参数,同时得到电机的转速变化曲线和输出性能等。分析结果表明该纵扭电机为多面接触,接触压力不存在局部高度集中的情况,且接触区域存在滑动。最后,根据设计的电机参数,加工原理样机,对理论分析进行实验验证。A novel bonded type longitudinal-torsional piezoelectric motor was presented,including the stator,the rotor,the preloading system,etc.The stator was particularly slotted to form a structure with multi vibrators.The vibrator was constituted by a metal substrate and piezoelectric ceramics,pasted on the outer surface of the metal substrate to simplify the motor structure.Through the reasonable adjustment of design parameters,the resonant frequencies of the first longitudinal vibration mode and the second torsional vibration mode of the stator were adjusted to be as close as possible. Meanwhile,all the vibrators were regulated to the resonance state,which is beneficial to improve the efficiency of the motor.To evaluate the overall performances of the designed motor,a finite element contact model was established to research the contact characteristics of the stator and the rotor.By analysing the static and transient contact process,the pressure distribution on contact areas,contact state,sliding distance,and etc.were all obtained under load free condition.Besides,the speed curve and the output performance of the motor were both acquired.The results of contact analysis show that the longitudinal-torsional motor is working in a multi-surface contact mode actually.The analysis results also show that the contact pressure does not locally concentrate and sliding happens at the contact areas.Finally, according to the design parameters,a prototype motor was fabricated and then the theoretical analysis was verified by experiments.

关 键 词：压电电机 有限元 接触模型 多面接触 

分 类 号：TM35[电气工程—电机]