Contact Model of a Ring-Type Traveling Wave Ultrasonic Motor


Traveling wave ultrasonic motors are driven by frictional force in the contact interface between the stator and the rotor. The operational characteristics of ultrasonic motors are determined by the contact mechanics. A quasi-analytical contact model of a ring-type traveling wave ultrasonic motor applied to the Canon autofocus lens drive system is presented here. First, the circumferential contact length and the contact pressure between the stator and the rotor are calculated using finite element analysis (FEA). Next, the tangential motion of the contact interface is calculated using a closed-form analytical method. The stick-slip behavior at the contact interface is taken into account, and the tangential stress and stick-slip distributions are obtained. Good correspondence between the theoretical and experimentally measured torque-speed characteristics is observed. © 2012 IEEJ Industry Appl Soc.

Meeting Name

15th International Conference on Electrical Machines and Systems, ICEMS 2012 (2012: Oct. 21-24, Sapporo, Japan)


Mechanical and Aerospace Engineering

Keywords and Phrases

Analytical Method; Contact Model; Finite Element Analysis; Ultrasonic Motor

Document Type

Article - Conference proceedings

Document Version


File Type





© 2012 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

24 Oct 2012

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