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. 19, 2001
Filed:
Sep. 17, 1999
Stefan Zeh, Leutkirch, DE;
Martin Weinmann, Bad Waldsee, DE;
Diehl AKO Stiftung & Co. KG., Wengen, DE;
Abstract
Described is a method of determining the rotary position of the rotor of a synchronous motor, in relation to the rotating magnetic stator field. The instantaneous rotor position is ascertained by measurement of the emf (E.s) induced in at least one stator winding by the rotor in a current gap in the stator current (I.s) flowing through said stator winding, wherein in accordance with the invention when using a sinusoidal or quasi-sinusoidal stator current an artificial current gap in the stator current is produced. In that case the induced emf (E.s) is directly derived from the tapped-off terminal potential (U.s) of the respective stator winding.