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:
Aug. 30, 2005
Filed:
May. 30, 2003
LI Chen, Livonia, MI (US);
Roy I. Davis, Saline, MI (US);
Stephen Stella, Northville, MI (US);
Tod R. Tesch, Novi, MI (US);
Li Chen, Livonia, MI (US);
Roy I. Davis, Saline, MI (US);
Stephen Stella, Northville, MI (US);
Tod R. Tesch, Novi, MI (US);
Ballard Power Systems Corporation, Dearborn, MI (US);
Abstract
A closed-loop permanent magnet motor control method and system optimally partitions torque and flux-weakening currents to produce a desired torque without exceeding the capability of the DC source. A maximum limit for allowable torque current and a minimum threshold for the maximum torque current are determined, and the flux current is varied based at least in part on whether the maximum torque current limit is above or below the minimum threshold while operating in a flux-weakening region to compensate for the variability of the DC source voltage.