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. 11, 2004
Filed:
Jan. 08, 2003
Applicant:
Inventor:
Hemant M. Sardar, Farmington Hills, MI (US);
Assignee:
TRW Automotive U.S. LLC, Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B 1/136 ;
U.S. Cl.
CPC ...
G05B 1/136 ;
Abstract
A motor current controller for a permanent magnet AC motor achieves a decrease in bandwidth variations that would otherwise be caused by temperature changes. The current controller dynamically modifies the integral gain of a proportional-integral regulator in response to temperature-induced changes in motor resistance. The integral gain value is calculated to maintain a substantially constant loop bandwidth within a current loop primarily comprising the permanent magnet AC motor, semiconductor switches connected in an H-bridge configuration, and the proportional-integral regulator.