Design and Fabrication of Three Touch Point Thin Ultrasonic Rotary Motor

作者：Jeong Seong Su; Cheon Seong Kyu; Park Jong Kyu; Park Tae Gone^*

来源：Ferroelectrics, 2014, 459(1): 143-152.

DOI：10.1080/00150193.2013.849181

• Ultrasonic motor
• piezo actuator
• thin stator
• three phase
• FEM

A novel structure three touch points thin ultrasonic rotary motor has been proposed to enable the actuator to use in small mobile equipment. A thin stator of simple structure is advantageous to use in tight spaces. Also, three points of contact enables to stable driving. Twelve ceramics plates were attached on upper and bottom side of the metal plate. When three phase alternating current sources are applied to the stator, elliptical displacements are generated at three inner edges of the stator. Modeling of the ultrasonic motor was done and the displacement characteristics were defined by using finite element analysis program. The effectiveness of the proposed design was verified by experiments. Characteristics of the motor such as speed, and input voltage were measured by using the driver and measurement equipment. Maximum displacement was appeared at frequency of minimum impedance. The resonance frequency was inversely proportional to the ceramic length. The maximum speed of 220 [rpm] was obtained at the resonance frequency, 76.4 [kHz]. The speed increase somewhat linearly with increasing applied voltage.

• 出版日期2014-1-3