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:
Feb. 15, 2005
Filed:
May. 28, 2002
Achim Netz, Seeheim-Jugenheim, DE;
Sighard Schräbler, Frankfurt, DE;
Holger Lüdtke, Frankfurt am Main, DE;
Peter Stauder, Mainz, DE;
Marcus Schulz, Bad Soden, DE;
Achim Netz, Seeheim-Jugenheim, DE;
Sighard Schräbler, Frankfurt, DE;
Holger Lüdtke, Frankfurt am Main, DE;
Peter Stauder, Mainz, DE;
Marcus Schulz, Bad Soden, DE;
Continental Teves AG & Co., OHG, Frankfurt, DE;
Abstract
The present invention relates to a method for the sensorless electric measurement of the position of a rotor of a permanently excited synchronous machine that is fed by a converter, by means of measuring signals which are sent to an evaluation device that calculates the electric position of the rotor from the angular dependence of the current space vector at an impressed stator flux pattern, wherein the distribution of absolute values of the differential current space vector varies in approximation in sinusoidal manner with twice the value of the electric rotor position angle sought. The method of the invention which can be used in particular in stationary or blocked machines is characterized in that the distribution of absolute values is produced from respectively two successive measurements for an almost inversed magnetization, in such a way that the superposition of the impressed stator flux and permanently excited rotor flux enables, due to saturation, a distribution of absolute values of the current space vector with two different maximum values, from which the electric rotor position angle sought is determined directly and unambiguously over 360°.