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:
Jun. 09, 2009
Filed:
Jul. 11, 2006
Chris Hills, Layton, UT (US);
Gene Payne, Salt Lake City, UT (US);
Chris Hills, Layton, UT (US);
Gene Payne, Salt Lake City, UT (US);
ITT Manufacturing Enterprises, Inc., Wilmington, DE (US);
Abstract
A system and method for actively tracking a drive frequency of a piezoelectric motor is disclosed. A drive voltage can be applied at a drive frequency to an active piezoelectric element in the piezoelectric motor. A voltage response can be induced in a passive piezoelectric element that is mechanically coupled to the active piezoelectric element to movably engage the passive piezoelectric element at a voltage response frequency. A phase difference can be determined between the drive frequency and the voltage response frequency. The drive frequency of the active piezoelectric element can be adjusted until the phase difference is within a predetermined parameter.