Piezoelectric ultrasound motor

Details Piezoelectric ultrasound motor Piezoelectric ultrasound motor

2005-05-13

2009-10-06

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07598656

ABSTRACT:
The invention relates to a piezoelectric ultrasound motor with an oscillator in the form of a piezoelectric plate of the length L and the height H as well as with one or two friction elements which are arranged at the oscillator and elastically pressed against the friction surface of the part to be moved. According to the invention, the piezoelectric plate is divided into two identical parts by a section plane extending vertically to the large surfaces, with at least one of these parts including an asymmetrical generator of an asymmetrical acoustic standing wave, which upon its activation generates an asymmetrical two-dimensional standing wave, so that the friction elements which are arranged in the center of the long end face of the plate carry out a movement with an inclination relative to the end face, so that the energy of motion is transferred to the element to be moved.

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Wischnewskity W. et al: “New ultrasonic piezoelectric actuator for nanopositioning” Actuator 2004, 9thInternational Conference on New Actuators, Bremen Germany, Jun. 14, 2004, pp. 118-122, XP009054063 p. 118, right-hand column, last paragraph-p. 119, left-hand column; figures 1,2.
Snitka V. “Stepping ultrasonic motors for precision positioning” Proceedings IEEE 1993 Ultrasonics Symposium, Baltimore, MD, USA, Oct. 31, 1993, pp. 449-452, XP010114997 ISBN: 0-7803-1278-3 p. 449, right-hand column, last paragraph—p. 450, left-hand column, paragraph 1; figure 1.
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