The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 2007
Filed:
Feb. 06, 2003
Peter C. Varadi, Albany, CA (US);
Björn B. Magnussen, Iserlohn, DE;
Dieter A. Schuler, Stuttgart, DE;
Peter C. Varadi, Albany, CA (US);
Björn B. Magnussen, Iserlohn, DE;
Dieter A. Schuler, Stuttgart, DE;
Elliptec Resonant Actuator AG, Dortmund, DE;
Abstract
A piezoelectric system has a piezoelectric motor () driving a driven element () so as to move the driven element () in response to an electric signal (). The motor () has at least a first optimal operating frequency at which the motor () moves the driven element () an amount that meets predetermined criteria. The motor () and driven element () have a desired performance criteria when operated at that first operating frequency. A plurality of concatenated sinusoidal sweeping frequencies are repeatedly supplied to the piezoelectric motor () with at least one of the sweeping frequencies being sufficiently close to the first operating frequency to cause detectable motion of the driven element (). The frequencies are varied in response to movement of at least one of the motor () and the driven element () to produce an average performance of the motor () and driven element () for a time corresponding to the time for one sweep of frequencies. The average performance is greater than an actual performance of the driven element () for the same period of time but when the actual performance is less than the desired performance.