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. 24, 2022
Filed:
Apr. 15, 2021
Abb Schweiz Ag, Baden, CH;
Omer Ikram Ul Haq, Surahammar, SE;
ABB Schweiz AG, Baden, CH;
Abstract
According to an aspect, there is provided an apparatus for performing angular position error estimation. The apparatus operates () a synchronous motor () according to a pre-defined pulsating torque signal using a sensorless vector control method with high-frequency voltage injection. The pre-defined pulsating torque signal has a zero mean and corresponds to a torque operating point. The apparatus measures () a first value of an estimated angular position at a first time instance corresponding substantially to an end point of the pre-defined pulsating torque signal and second values of the estimated angular position and an estimated angular speed at a second time instance occurring after the first time instance. Based on the measured values, the apparatus estimates () an error in the estimated angular position and stores () the error to a lookup table. After performing said steps for one or more pre-defined pulsating torque signals, the apparatus operates () the synchronous motor () using the lookup table for angular position error correction.