Characteristic Analysis and Experimental Study of Spherical Ultrasonic Motor with Multi-degree-of-freedom

Zheng Li; Zhe Wang; Liang Zhao; Peng Guo

doi:10.6180/jase.202012_23(4).0006

Characteristic Analysis and Experimental Study of Spherical Ultrasonic Motor with Multi-degree-of-freedom

Zheng Li This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Zhe Wang¹, Liang Zhao¹, and Peng Guo¹

¹School of Electrical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, P.R. China

Received: November 15, 2019
Accepted: June 8, 2020
Publication Date: December 1, 2020

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202012_23(4).0006

ABSTRACT

A novel MDOF (multi-degree-of-freedom) spherical ultrasonic motor with three stators built-in is proposed aiming at high power density and compact structure. Firstly, the structure of the motor is described in detail. The motor realizes the three-degree-of-freedom movement of the spherical rotor through three ring stators. In addition, a structure for simultaneously applying pre-pressure to multiple stators is proposed. Then the working principle of the MDOF motion is analyzed. Based on the ﬁnite element software, the modal, harmonic response and transient analysis of the stator are carried out to solve the motion process and characteristic analysis of the stator vibration. Finally, the prototype is fabricated and tested. The frequency-impedance curve is measured by the impedance analyzer TH2829A to obtain its resonant frequency. Through rotation speed experiment, its frequency-speed characteristic curve and the maximum output speed of the motor are obtained. The rationality of MDOF spherical ultrasonic motor is proved.

Keywords: MDOF spherical ultrasonic motor; Finite element analysis; Resonant frequency; Output characteristic test

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