关键词: 压电马达, 夹心式换能器, 弯振模态, 舵机, 鸭翼, 摇头型

Abstract: Aiming at the compact and direct drive requirements of rudder actuator for guided ammunitions, a hybrid piezoelectric stator with sandwich transducer inducing bending vibration of double annual plate was proposed. A novel rotary piezoelectric motor might be configured by the proposed stator to actuate the canard wings. Four pieces of piezoelectric ceramics were installed in the middle of the sandwich transducer to excite the bending mode of the stator and the output amplitudes were amplified by two annual plates. The rocking head type vibrations of sandwich transducer excited the fifth-order bending mode of the annual plates at both ends and the output amplitudes might be amplified. Two disk rotors were pressed on the driving surface of the hybrid stator and driven to rotate by the friction interface between the stator and rotors. The rocking head type motor with double annual plates was designed for the actuation of canard wings of a guidance system. The structural dynamics model of the hybrid stator was built, and the vibration mode of the stator was calculated by using the finite element method. Then a prototype of the rocking head type piezoelectric motor with double annual plate was produced. Finally, a test platform was built to study the output characteristics of the motor. Under the driving voltage of 300 V, the maximum speed may reach 190 r/min and the maximum output torque may reach 0.07 N·m.

Key words: piezoelectric motor, sandwich transducer, bending vibration mode, rudder canard wing, canard wing, rocking head type