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. 04, 2025
Filed:
Sep. 27, 2023
Abb Schweiz Ag, Baden, CH;
Marko Hinkkanen, Espoo, FI;
Lauri Tiitinen, Espoo, FI;
ABB Schweiz AG, Baden, CH;
Abstract
According to an aspect, there is provided an apparatus for a drive for driving an induction motor. The apparatus having means for performing the following. The apparatus obtains a stator current vector of the induction motor and estimates, using a state observer for the stator and/or rotor flux linkage vector of the induction motor, the stator and/or rotor flux linkage vector based on the stator current vector, a voltage reference vector and a stator angular frequency reference. The state observer is a speed-sensorless reduced-order state observer based on a mathematical model of the induction motor. The apparatus performs speed-sensorless state-feedback control based on the estimated stator and/or rotor flux linkage vector, the stator current vector, a stator flux linkage reference vector and the stator angular frequency reference for calculating the stator voltage reference vector. The apparatus applies the stator voltage reference vector to an inverter of the drive.