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:
Jul. 22, 2014
Filed:
Sep. 22, 2011
Jihoon Jang, Torrance, CA (US);
Jihoon Jang, Torrance, CA (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
Methodologies and systems are provided for current estimation in electric motor. The system comprises an electric motor having sensors for sensing at least motor current, motor temperature and motor speed. A vehicle controller is coupled to the sensors and includes a closed-loop current control system for the electric motor having a current compensation circuit for providing a current compensation signal that is used to adjust a current command for the electric motor. The current compensation circuit includes a short-circuit current calculator for providing a short-circuit current value based upon the motor temperature and the motor speed, a compensation gain calculator for providing a gain compensation value based upon the motor speed, and circuitry for combining the motor current, the short-circuit current value and the gain compensation value to provide the current compensation signal. Methods for current estimation in electric motor are also provided.