Abstract
In this paper, a novel actuation approach is proposed for linear ultrasonic motors by applying a square-wave excitation voltage across the piezoceramic elements. Using this approach, the output force and power of the ultrasonic motor can be tangibly increased, without increasing its stator volume, thereby leading to improvement in the actuator power density. Added normal force is exerted on the moving stage by exciting the higher longitudinal resonant modes, the frequencies of which coincide with the harmonics of the square-wave voltage. The proposed approach is illustrated herein via the simulation of a suitably designed bimodal linear ultrasonic motor using finite-element analysis.
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