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A Note on a Longitudinal and Torsional Type of Ultrasonic Motor with two Stators
Author(s) -
Yi Youping,
Gausmann Rainer,
Seemann Wolfgang,
Zhong Jue
Publication year - 2005
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200510054
Subject(s) - ultrasonic motor , stator , rotor (electric) , acoustics , position (finance) , longitudinal mode , torsional vibration , mode (computer interface) , ultrasonic sensor , physics , french horn , actuator , engineering , mechanical engineering , vibration , optics , computer science , electrical engineering , laser , finance , economics , operating system
This paper deals with an ultrasonic motor, which consist of one rotor and two stators. The main parts of each stator are one longitudinal and one torsional piezoceramic actuator, which are used to generate the desired elliptical orbit on the stator surface. For the purpose of a high efficiency, the longitudinal and the torsional resonant frequency should ideally coincide with the operational frequency. To match the resonant frequencies, two adjustable rings are added to the stators. The influence of the mass and the position of the rings on the first longitudinal and the first torsional eigenfrequency and their mode shapes is investigated. The experimental results fit very well with the theoretical predictions and show that the adjusting rings can be used to match the eigenfrequencies of the two mode shapes. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)