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:
Sep. 01, 2015
Filed:
Feb. 06, 2013
Alan Patrick Cahill, Galway City, IE;
Gary Casey, Prospect, IE;
John A. Cleary, Kilmallock, IE;
Eoin Edward English, Pallasgreen, IE;
Christian Jimenez, Valencia, ES;
Javier Calpe Maravilla, Algemesi, ES;
Colin G. Lyden, Baltimore, IE;
Thomas F. Roche, Limerick, IE;
Alan Patrick Cahill, Galway City, IE;
Gary Casey, Prospect, IE;
John A. Cleary, Kilmallock, IE;
Eoin Edward English, Pallasgreen, IE;
Christian Jimenez, Valencia, ES;
Javier Calpe Maravilla, Algemesi, ES;
Colin G. Lyden, Baltimore, IE;
Thomas F. Roche, Limerick, IE;
ANALOG DEVICES GLOBAL, Hamilton, BM;
Abstract
A method and apparatus for automatic resonance detection is disclosed for a motor-driven mechanical system such as a voice coil motor (VCM) in which a resonance detector and driver are provided. The automatic resonance detector is implemented on the same integrated circuit as the driver, and dynamically determines the natural resonant frequency of the VCM driven by the driver. The resonant frequency is determined by measuring the back electromotive force (BEMF) of the VCM, detecting the slope of the BEMF signal, and determining the resonant frequency from the slope of the BEMF signal.