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RESEARCH PAPERS

FE Analysis and LDA Measurement of the Dynamic Rotor/Stator Contact in a Ring-Type Ultrasonic Motor

[+] Author and Article Information
Takashi Maeno, David B. Bogy

Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Tribol 115(4), 625-631 (Oct 01, 1993) (7 pages) doi:10.1115/1.2921686 History: Received May 12, 1992; Revised September 12, 1992; Online June 05, 2008

Abstract

We study the dynamic contact characteristics between the rotor and stator of a ring-type ultrasonic motor by measurement and simulation. First, we measure the tangential and normal velocities and displacements of the rotor/stator interface using a LDA (laser Doppler anemometer). It is especially suitable for our measurement since it directly measures the velocity with high precision. Next, we solve the dynamic contact problem of the rotor/stator interface by use of finite element analysis taking into consideration inertial effects and replacing the ring by an equivalent straight model of the rotor/stator. The calculated tangential and normal displacements and velocities of the rotor/stator are in good agreement with the measured ones. The effect of inertia was studied by changing the density of the rotor in the calculation. When the rotor’s density is decreased to produce smaller natural frequencies, the velocity fluctuation and the frictional loss increase.

Copyright © 1993 by The American Society of Mechanical Engineers
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