摘要
提出了一种新型纵弯超声电机振子结构,本振子分为两组进行激励,通过控制输入激励信号,实现在振子上激励出在时间上相差π/2的纵弯模态响应,纵弯模态响应叠加在振子驱动足上产生椭圆运动轨迹,进而通过驱动足和动子之间的摩擦作用,使动子产生运动。该文在分析该振子工作机理的基础上,建立了纵弯振子的参数化有限元模型,通过模态分析进行模态特征频率的结构参数灵敏度分析,最终实现振子的纵弯模态的匹配。并对振子驱动足表面质点振动轨迹进行了分析,瞬态分析得到振子驱动足表面质点运动轨迹接近理想的椭圆轨迹,分析结果为物理样机的研制提供了理论依据。
A new ultrasonic motor vibrator using longitudinal and bending modes was proposed in this paper. The motor vibrator are excited with two different groups of signal, a longitudinal and bending vibration mode response with π/2 time difference on the vibrator is excited by controlling the input exciting signals. Thus an elliptical motion is generated when the longitudinal and bending mode response is superposed on the driving foot of vibrator, and the rotor is driven to motion through the friction force between the driving foot and the rotor. The parametric FEM model is established based on analyzing the operating principle of the proposed motor vibrator. The structure parameter sensitivity of the modal characteristic frequency is analyzed through the modal analysis, and the longitudi- nal and bending modes of the vibrator are matched finally. The motion trajectories of nodes on the driving foot are analyzed. The result of transient analysis shows that the trajectory of node on driving foot is nearly an ellipse. The results of this work could be useful in the development of this new type of motor vibrator.
出处
《压电与声光》
CSCD
北大核心
2014年第3期353-356,362,共5页
Piezoelectrics & Acoustooptics
基金
中央高校基本科研业务费专项基金资助项目(NS2012131)
关键词
超声电机
纵弯振子
有限元法
振动特性
ultrasonic motor
longitudinal and bending vibrator
FEM
vibrations characteristics
