NDLI: Influence of the piezoelectric actuator on the vibrations of the stator of a traveling wave motor

Content Provider	IEEE Xplore Digital Library
Author	Krome, J.W. Wallaschek, J.
Copyright Year	1995
Description	Author affiliation: Heinz-Nixdorf Inst., Univ. Gesamthochschule Paderborn, Germany (Krome, J.W.; Wallaschek, J.)
Abstract	By appropriate superposition of two standing waves a traveling wave can be excited in the ring-shaped stator of a traveling wave motor. Thus the material points on the surface of the stator perform an elliptical motion. A second disk, pressed against the stator, is driven by frictional forces, generated in the interface between stator and rotor. Traveling wave motors produce a very high torque at low rotational speed. Their simple mechanical design and good controllability make these motors a very promising alternative to small electro-magnetic motors. The mechanical oscillations of high frequency are excited by piezoelectric ceramic actuators, bonded to the surface of the stator. The dynamic behavior of the stator is strongly influenced by these actuators. Since it is very difficult to produce big ceramic rings for large stators and bond them to the stators we tried to excite a large stator using single piezoelectric elements. The geometry of the ceramic actuators as well as the stiffness of the bonding layer do have marked influence on the efficiency of the excitation, because the actuation mechanism is of induced strain type and the stator is excited by tangential stresses in the bonding layer. In this paper the influence of the shape of the ceramics on the vibration of the stator is investigated using the finite element method. A detailed model taking into account the piezoelectric effect in the ceramic actuators as well as the exact geometry of the stator is used to calculate the transfer function between the electrical excitation and the mechanical vibrations of the stator. The results allow one to compare the efficiency of different actuator configurations.
Starting Page	413
Ending Page	416
File Size	281957
Page Count	4
File Format	PDF
ISBN	0780329406
ISSN	10510117
DOI	10.1109/ULTSYM.1995.495611
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Piezoelectric actuators Stators Ceramics Bonding Vibrations Geometry Rotors Torque Controllability Frequency
Content Type	Text
Resource Type	Article

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