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:
Jun. 21, 2011
Filed:
Nov. 22, 2006
Joerg Hornberger, Dornstetten-Aach, DE;
Christian Rudel, Koenigsfeld, DE;
Siegfried Schreiner, Villingen-Schwenningen, DE;
Joerg Hornberger, Dornstetten-Aach, DE;
Christian Rudel, Koenigsfeld, DE;
Siegfried Schreiner, Villingen-Schwenningen, DE;
EBM—Papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An electric motor has a stator () as well as a rotor () rotatable about a rotation axis () and a sensor magnet () having an even number of sensor poles (). The sensor magnet () is configured to generate a magnetic flux having a magnetic flux density that changes sinusoidally with respect to the rotation angle. Two analog rotor position sensors () are arranged on a support structure () at a distance from one another such that, during operation, they generate two sinusoidal signals (B_S, B_S) having a phase shift of 90° to each other. A signal generator () serves to generate at least one pulse-shaped signal (A, B) from the two sinusoidal rotor position signals (B_S, B_S) that are phase-shifted by 90°. The instantaneous rotation speed can be accurately determined from this pulse-shaped signal.