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:
Nov. 06, 2001
Filed:
Jan. 17, 2001
Mikko Norrkniivilä, Masala, FI;
Samuli Heikkilä, Helsinki, FI;
ABB Industry Oy, Helsinki, FI;
Abstract
A method for controlling an inverter which comprises the switching components to be controlled, the method comprising the steps of determining a current vector ({overscore (i)},) for the inverter output; determining a flux vector ({overscore (&psgr;)}) for the inverter load; determining an angular speed (&ohgr;) for the inverter load; determining a resistance (R) for the inverter load. The method further comprises the steps of determining a voltage vector ({overscore (b)}) as a sum of the product of the inverter load resistance (R) and the output current vector ({overscore (i)},) and a voltage proportional to the electromotive force of the load; forming a direction vector ({overscore (S)}) on the basis of a current vector ({overscore (i)},) for the inverter reference value and the inverter output current vector ({overscore (i)},); determining a space coordinate system &mgr;&ugr; associated with the voltage vector ({overscore (b)}) and having a real axis &mgr; which is co-directional with the voltage vector ({overscore (b)}); determining the direction vector ({overscore (S)}) in the &mgr;&ngr; coordinates system; and forming inverter switch commands on the basis of a component ({overscore (S)},) co-directional with the &mgr; axis of the direction vector ({overscore (S)}) and a component ({overscore (S)},) co-directional with the &ugr; axis.