关键词: 压电微电动机, 连杆机构, 位移放大, 力学分析

Abstract:

To solve the wear between stator and rotor of the traditional piezoelectric motor, a small rotary piezoelectric motor based on connecting rod magnifying mechanism is proposed. The working principle of the motor is illustrated, and the design process of the motor was given. By using mechanics theory, the equations of the harmonic output forces and displacements were deduced. Based on the movable tooth drive theory, the forces on movable teeth are analyzed. Moreover, the law of harmonic forces and displacements change with voltage and time was solved by calculating examples. And the law of forces on movable teeth change with voltage was analyzed. Results show that the harmonic displacements excited by the system were sufficient to drive the motor with a continuously rotation. What's more, the forces of central gear on movable teeth are largest, and it is 1.97 times larger than those of rotor forces. These results provide a basis for structural development and performance improvement of the proposed piezoelectric motor.

Key words: small piezoelectric motor, connecting rod, displacement magnifying, mechanical analysis