Design and mechanical analysis of a mesh- type rotary harmonic piezoelectric motor

Article type: Research Article

Authors: Li, Chong^{a; b}

Affiliations: [a] School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China | [b] Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China | E-mail: [email protected]

Abstract: To obtain a large output torque and a long lifetime, a mesh-type harmonic piezoelectric motor is proposed in this paper. In addition, the operating principle of the motor is illustrated, and the displacements and forces of amplification mechanism are provided. Moreover, the equations of forces on the transmission system and output torque for the motor are deduced. By utilizing these equations, the output torque of the motor was analyzed and the influence of the system parameters on the output torque was investigated. Furthermore, the experiments of the displacements for the amplification mechanism and the output torque for the motor were studied. The results showed that the largest test output torque is 0.383 Nm when the driving voltage is 150 V. The following parameters should be selected to increase the output torque of the motor: large offset a, length l1 and l5, strain constant d33, elastic modulus of piezoelectric actuator c33, sectional width Ap, small parameter b, lengths l3 and l8 and ceramic thickness lp. The results are useful for improving the performance of the motor.

Keywords: Piezoelectric motor, harmonic drive, movable tooth drive, output torque

DOI: 10.3233/JAE-170074

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. 3, pp. 461-478, 2018