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. 22, 2007
Filed:
Aug. 17, 2004
Antti Piippo, Espoo, FI;
Antti Piippo, Espoo, FI;
ABB OY, Helsinki, FI;
Abstract
A method for determining the speed and position of a rotor of a salient-pole permanent magnet synchronous machine, the method comprising the steps of creating a voltage model () on a permanent magnet synchronous machine, forming a voltage reference (u) for a stator of the permanent magnet synchronous machine, determining stator currents (is) of the permanent magnet synchronous machine, calculating a rotor angular speed () from the voltage reference (u) and the stator currents (i) using the voltage model (). The method further comprises the steps of forming with signal injection a position tracking signal (ε) of the rotor of the permanent magnet synchronous machine, forming a rotor angular speed estimate ({circumflex over (ω)}) from the calculated rotor angular speed () and the rotor position tracking signal (ε), forming a rotor position angle estimate ({circumflex over (θ)}) from the formed rotor angular speed estimate ({circumflex over (ω)}) and the rotor position tracking signal (ε).