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:
Apr. 24, 2007
Filed:
Feb. 04, 2005
Andreas Danell, Uppsala, SE;
Stefan Johansson, Uppsala, SE;
Johan Abrahamsson, Uppsala, SE;
Jonas Eriksson, Uppsala, SE;
Andreas Danell, Uppsala, SE;
Stefan Johansson, Uppsala, SE;
Johan Abrahamsson, Uppsala, SE;
Jonas Eriksson, Uppsala, SE;
Piezomotor Uppsala AB, Uppsala, SE;
Abstract
In manufacturing electromechanical drive elements, vibration properties are defined in a test environment. These properties are found to give a good operation when being arranged in a motor. Two flexural vibration modes are defined. One is an s-mode connected to an element being strapped at two supports at respective outer portions. The s-mode have three nodal points. The other vibration mode is an ε-mode connected to an element being strapped at the supports and at a drive pad arranged at a middle portion. The ε-mode has one nodal point at each side of the middle portion and the middle portion has a stroke amplitude that is smaller than stroke amplitudes at portions between the middle portion and the nodal points. An average of the resonance frequencies of the s-mode strapped at two and three points, respectively, differs from and the ε-mode resonance frequency by less than 25%.