Output characteristics and experiments of a novel low frequency rotary piezoelectric motor

• Published in: Journal of mechanical science and technology 2022, 36(3), , pp.1145-1156
• Main Authors: Liang, Kang, Li, Chong, Tong, Yujian, Fang, Jiwen, Zhong, Wei, Fu, Xiaorui
• Format: Article
• Language: English
• Subjects: Control; Dynamical Systems; Engineering; Harmonic motion; Industrial and Production Engineering; Mechanical Engineering; Original Article; Piezoelectric actuators; Piezoelectric motors; Torque; Vibration; 기계공학
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-022-0207-6

In order to improve the output performance of a piezoelectric motor under low driving frequency, a novel rotary piezoelectric motor driven by two piezoelectric actuators is proposed that is actuated based on harmonic and friction driving mechanism. The motor uses two piezoelectric actuators to drive two amplifying mechanisms with π/2 phase difference to produce harmonic motion, and then drives the rotor to rotate through friction force. Based on the driving principle, the electromechanical coupling equations of the motor are established. And a test platform is built to test the output characteristics of the motor. The results show that fluctuation of harmonic force and output torque occurs when the motor operates at different positions. Under the driving voltage and frequency of 150 V and 5 Hz, the actual average output torque of the prototype is 3.08 Nmm. Moreover, fluctuation of harmonic force and output torque occurs when the motor operates at different positions.