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:
May. 20, 2008
Filed:
May. 09, 2006
Roger Desailly, Vitry aux Loges, FR;
Jeremy Malaize, Cheptainville, FR;
Jean Levine, Paris, FR;
Daniel Gvero, Chateauneuf sur Loire, FR;
Franck Duquenoy, Olivet, FR;
Roger Desailly, Vitry aux Loges, FR;
Jeremy Malaize, Cheptainville, FR;
Jean Levine, Paris, FR;
Daniel Gvero, Chateauneuf sur Loire, FR;
Franck Duquenoy, Olivet, FR;
Newport Corporation, Irvine, CA (US);
Abstract
An apparatus comprises a brushless motor, driver, incremental displacement sensor, and processor. The motor has a rotor, stator, and electrical terminals accepting a drive signal. The initial phase of the rotor is unknown. The driver is connected to the electrical terminals and produces the drive signal. The displacement sensor is configured to measure a displacement of the rotor and to produce an output signal. The processor has an input receiving the output signal and an output connected to the driver. The processor causes the driver to produce the drive signal according to a predetermined function of time, observes the output signal from the displacement sensor resulting from the drive signal, and performs mathematical computations on the basis of the observed output signal and a model of dynamic behavior of the motor to estimate the initial phase of the rotor.