Liu Yingxiang, Chen Weishan, Yang Xiaohui, Liu Junkao
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China.
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China.
Ultrasonics. 2015 Feb;56:551-6. doi: 10.1016/j.ultras.2014.10.010. Epub 2014 Oct 19.
A new T-shape piezoelectric motor using the hybrid of two orthogonal longitudinal vibrations is proposed in this work. Six pieces of PZT ceramic plates are bonded on the upside and downside surfaces of a T-shape duralumin alloy base respectively to form the proposed motor. Elliptical movement can be generated on the driving tip by applying sine and cosine voltages to the PZT elements. The horizontal displacement of the driving tip will push the runner while the vertical displacement can overcome the preload. Finite element method is used to accomplish the design and analysis process. The resonance frequencies of the two vibration modes are tuned to be close by modal analysis, while the motion trajectory of the driving tip is observed by transient analysis. After the fabrication of a prototype, the vibration characteristics and mechanical output ability are measured. The no-load speed and the maximum output thrust force of the proposed motor are tested to be 718 mm/s and 3.5 N under an exciting frequency of 53.1 kHz. The proposed T-shape piezoelectric motor exhibits merits of simple structure, easy to realize miniaturization, easy to be fabricated, and high power-to-weight ratio.
本文提出了一种利用两种正交纵向振动混合的新型T形压电电机。六片PZT陶瓷片分别粘结在T形硬铝合金基座的上、下表面，以构成所提出的电机。通过向PZT元件施加正弦和余弦电压，可在驱动尖端产生椭圆运动。驱动尖端的水平位移将推动转轮，而垂直位移可克服预载。采用有限元方法完成设计和分析过程。通过模态分析将两种振动模式的共振频率调谐至接近，同时通过瞬态分析观察驱动尖端的运动轨迹。制作原型后，测量其振动特性和机械输出能力。在所提出的电机在53.1kHz的激励频率下，空载速度和最大输出推力经测试分别为718mm/s和3.5N。所提出的T形压电电机具有结构简单、易于实现小型化、易于制造和功率重量比高等优点。
