JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.5 P.786-792

http://doi.org/10.1631/jzus.2007.A0786

Novel high torque bearingless two-sided rotary ultrasonic motor

Author(s): LI Xia, CHEN Wei-shan, XIE Tao, LIU Jun-kao
Affiliation(s): Department of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Corresponding email(s): jennyhit@163.com
Key Words: Two-sided, Ultrasonic motor (USM), Piezoelectric motor, Travelling-wave, Bearingless

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Abstract: Applications are limited at present because the currently available ultrasonic motors (USMs) do not provide sufficiently high torque and power. The conventional travelling-wave USM needs the bearing to support, which required lubricant. To solve the above problem, a bearingless travelling-wave USM is designed. First, a novel structure of the two-sided USM consisting of a two-sided teeth stator and two disk-type rotors is designed. And the excitation principle of the two-sided travelling-wave USM is analyzed. Then, using ANSYS software, we set up the model of the stator to predict the excitation frequency and modal response of the stator. The shape of the vibration mode was obtained. Last, the load characteristics of the USM are measured using experimental method. The maximum stall torque and the no-load speed were obtained. The results showed that the characteristics of the two-sided USM are better than those of the conventional one-sided USM.

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