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:
Jul. 08, 2008
Filed:
Dec. 08, 2004
Ralf Hochhausen, Ingolstadt, DE;
Jörg Seyfarth, Regensburg, DE;
Pietro DE Filippis, Milan, IT;
BSH Bosch und Siemens Hausgeraete GmbH, Munich, DE;
Abstract
Device for determining the position of the rotor in an electric motor comprises a detector, which is mounted on the electric motor and which is sensitive to the passage of the rotor through a reference position, and comprises a phase-locking loop, which can be synchronized with the output signal of the detector and which furnishes an output signal representative of the position of the rotor. The moments when the rotor passes through a reference position are detected, the period of the oscillator is adapted in such a manner that the reference position passages occur at a predetermined phase of the oscillator, and the position of the rotor is derived from the oscillation of the oscillator between the reference position passages.