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:
Oct. 15, 2013
Filed:
Aug. 19, 2011
Torsten Klemm, Eschborn, DE;
Ingo Vetter, Karben, DE;
Uwe Jungnickel, Koenigstein, DE;
Benedikt Heil, Ober-Moerlen, DE;
Kris Lueckel, Kronberg, DE;
Torsten Klemm, Eschborn, DE;
Ingo Vetter, Karben, DE;
Uwe Jungnickel, Koenigstein, DE;
Benedikt Heil, Ober-Moerlen, DE;
Kris Lueckel, Kronberg, DE;
Braun GmbH, Kronberg, DE;
Abstract
A resonant motor unit that has a resonant motor, a control unit, a measurement unit, and an evaluation unit is described. The control unit drives the resonant motor at a driving frequency, short-circuits the resonant motor during at least a first short-circuiting phase in successive driving cycles and concludes the first short-circuiting phases by switching off the current flow through the resonant motor at least at a predetermined first time instant within the driving cycles. The measurement unit successively measures at least a first voltage signal provided by the resonant motor at the predetermined first time instant, and the evaluation unit for determines whether the first voltage signal has changed between successive measurements.