Abstract
A novel ring type traveling wave ultrasonic motor (USM) with multiple wavenumbers hasbeen designed, fabricated and characterized. This multiple wavenumber operation isrealized by means of a new electrode configuration of the piezoelectric element. Theexperimental and numerical performance results for the multiple wavenumbers show thatUSM with multiple wavenumbers significantly outperform the single wavenumber motor asregards the range of speed and torque output. This novel implementation of thetraveling wave motor also offers extra control for stable operation of USM. Theperformances of the control variables, the wavenumber and the amplitude, are comparedto show their advantages and disadvantages. The speed control range for thewavenumber is larger than that for amplitude control; wavenumber control has betterstability at low speed while amplitude control can work continuously with lesswear. Hybrid control using both methods may result in better performance ofUSM.
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