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:
Nov. 15, 2005
Filed:
Nov. 30, 2004
Zheng Wang, Mississauga, CA;
Jack Daming MA, Mississauga, CA;
George You Zhou, Mississauga, CA;
Honeywell International Inc., Morristown, NJ (US);
Abstract
A method and apparatus control a power converter () of an AC motor drive system (). The method and apparatus: generate a field current regulating signal to control a field current component flowing from the power converter () to the AC motor (), thereby achieving field current regulation; generate a torque current regulating signal to control a torque current component flowing from the power converter () to the AC motor (), thereby achieving torque current regulation, the torque current regulation having lower priority than the field current regulation; and execute a close-loop field weakening control scheme, which generates a field weakening control command as a function of the difference between a torque current regulation voltage demand and voltage available for torque current regulation. The field current regulating signal is adjusted in accordance with the field weakening control signal to selectively reduce back EMF of the AC motor (), thereby enabling the step of generating a toque current regulating signal to achieve a toque current component needed to drive the AC motor () at a desired speed despite a limitation on DC voltage available to the power converter ().