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Novel utrasonic motors with mono- and bimodal drives

โœ Scribed by M. Fleischer; D. Stein; H. Meixner

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
479 KB
Volume
21
Category
Article
ISSN
0924-4247

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โœฆ Synopsis

Plezomotors use the plezoelectncally excited natural mechamcal oscillations of resonators to dnve a rotor The monomodal motors presented here are based on a purely longtudmally osciatmg rod which IS posltloned asymmetncally on a roller-shaped rotor Lateral displacement of the resonator tip resulting from the hard Impact dnves the rotor With a newly optimized longtudmal resonator, these umdlrectlonal motors have efficlencles of greater than 35% at rotational speeds of around 150 rpm These monomodal motors form the basis for a new blmodal motor which operates simultaneously wth a longtudmal and a flexural mode The rotational motion of the resonator tip, resulting from the superposltlon of these modes, 1s used to dnve the rotor directly With this concept, It has been possible for the first time to realize a reversible plezomotor reqmrmg only one electrical power amplifier

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