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. 14, 2021
Filed:
Oct. 29, 2019
Abb Schweiz Ag, Baden, CH;
Omer Ikram UL Haq, Surahammar, SE;
Luca Peretti, Järfälla, SE;
ABB Schweiz AG, Baden, CH;
Abstract
A method of controlling an electrical machine, wherein the method includes: a) injecting a first voltage waveform (u) with a first fundamental frequency into the electrical machine in a first axis of a rotor reference frame, combined with a voltage signal for controlling the electrical machine, b) determining a second axis current component (i) of a second axis of the rotor reference frame, having the first fundamental frequency, generated in response to the injection of the first voltage waveform (u), c) controlling based on the second axis current component (i) a second axis voltage component (u) of the second axis, having the first fundamental frequency, to obtain an adjusted second axis voltage component for controlling the second axis current component (i) towards zero, d) feeding back the adjusted second axis voltage component to combine the adjusted second axis voltage component with the voltage signal and the injected first voltage waveform (u), and repeating steps b)-d) until the second axis current component is smaller than a threshold value (i), e) determining a differential cross-coupling parameter of the electrical machine based on the second axis voltage component (u) and a first axis current component (i) having the first fundamental frequency, when the second axis current component is smaller than the threshold value (i), and g) controlling the electrical machine based on the differential cross-coupling parameter.