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. 17, 2005
Filed:
Oct. 10, 2002
Nitinkumar R. Patel, Cypress, CA (US);
Steven E. Schulz, Torrance, CA (US);
James M. Nagashima, Cerritos, CA (US);
Seung Ki Sul, Seoul, KR;
Yo-chan Son, Seoul, KR;
Bon-ho Bae, Seoul, KR;
Nitinkumar R. Patel, Cypress, CA (US);
Steven E. Schulz, Torrance, CA (US);
James M. Nagashima, Cerritos, CA (US);
Seung Ki Sul, Seoul, KR;
Yo-Chan Son, Seoul, KR;
Bon-Ho Bae, Seoul, KR;
General Motors Corporation, Detroit, MI (US);
Abstract
A control system for an electric motor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a first motor speed control block in the controller injecting a high frequency signal into the electric motor to determine the speed and position of the electric motor, a second motor speed control block in the controller detecting the back electromotive force to determine the speed and position of the electric motor, and a transition control block in said controller to vary operation between the first motor speed control block and the second motor speed control block.