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:
Sep. 05, 2006
Filed:
Jun. 30, 2005
Mikko Vertanen, Espoo, FI;
Mikko Vertanen, Espoo, FI;
ABB Oy, Helsinki, FI;
Abstract
A method for determining the rotor flux vector of an electrical machine, the method comprising the steps of controlling the electrical machine with an inverter, forming an equation for the reactive power (Q) at the output of the inverter, forming an equation for the consumed reactive power ({circumflex over (Q)}) in the electrical machine, forming a reactive power balance equation (Q) between the reactive power (Q) at the output of the inverter and the reactive power ({circumflex over (Q)}) consumed in the electrical machine, determining the stator resistance ({circumflex over (R)}) of the electrical machine from the balance equation (Q), determining the stator flux estimate ({circumflex over (ψ)}) using the determined stator resistance ({circumflex over (R)}) and the balance equation (Q), and determining the rotor flux estimate ({circumflex over (ψ)}) using the determined stator flux estimate ({circumflex over (ψ)}).