用于光阑的旋转型驻波压电作动器  

Rotary Type Standing Wave Piezoelectric Actuator for Aperture

作　　者：刘坚[1] 金家楣[1] 陈迪[1] 王亮[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《振动．测试与诊断》2018年第1期97-102,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51375225;51775263);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为了驱动光阑实现对光束的控制和调节,提出一种新型的旋转型驻波压电作动器。现有压电作动器中,性能稳定的多为单一振子复合模态工作方式,要求各工作模态频率差小,除了对加工精度要求高之外,由于工作磨损对各模态频率影响不同,工作模态的频率差增大,使作动器的性能和效率下降。针对这一问题和光阑的工作特点,研制了一种新型的旋转型压电作动器。该作动器利用两个相同结构杆形压电振子的同形模态,经摩擦驱动光阑活动环转动,达到调节光阑孔径的目的。原理样机实验表明:当预压力为8N时,在驱动电压为200V_(p-p)～400V_(p-p)范围内,作动器的旋转速度与电压成正比,最大的逆时针旋转速度为75.36rad/min,最大的顺时针运动速度为62.8rad/min;在驱动电压为400V_(p-p)下分辨率可以达到0.34mrad。该压电作动器满足了光阑光束控制的要求,具有结构简单、响应快速、调速平稳和精度高等优点。In order to control and regulate light beam by driving aperture,A new rotary type standing wave piezoelectric actuator is proposed.In the existing PZT actuators with stable performance,always works in composited models of a single PZT oscillator,which a high requirement for manufacturing accuracy is put forward to.The performance and efficiency of the actuators would fall when the coupling effect of the vibration modes deteriorated by the oscillator size change after a long time friction and wear.Aimed to solving the problem and the character of aperture,this piezoelectric actuator is proposed.By using the same model of the same two rod-shaped PZT oscillator,rotary motion of aperture is driven by friction.Prototype machine is designed and manufactured,experimental study is carried out.Under the circumstance of fixing the pre-load pressure at 8N,and adjusting the driving voltage from 200 V_(p-p) to 400 V_(p-p),the rotational speed shows a linear relationship with the driving voltage.The maximum clockwise speed is 75.36 rad/min and the maximum anticlockwise speed is 62.8 rad/min.The resolution of the modal-independent USM is up to 0.34 mrad at the applied voltage of 400 V_(p-p).The piezoelectric actuator fulfills the function of driving aperture,characterized by simpler structure,fast response,smooth operation and high precision.

关 键 词：光阑 压电作动器 频率一致性 摩擦磨损 

分 类 号：TM356[电气工程—电机] TB552[理学—物理]