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:
Mar. 31, 2009
Filed:
Oct. 31, 2006
Gregory J. Speckhart, Peoria, IL (US);
Mark Edward Hartman, Peoria, IL (US);
Jackson Wai, Peoria, IL (US);
Joshua Michael Williams, Peoria, IL (US);
Gregory J. Speckhart, Peoria, IL (US);
Mark Edward Hartman, Peoria, IL (US);
Jackson Wai, Peoria, IL (US);
Joshua Michael Williams, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A system is provided for controlling an electric machine. The system has a power source configured to supply electric energy to the electric machine. In addition, the system has an inverter operationally connected to the power source and the electric machine and configured to increase or decrease a rotor flux component of a voltage applied to the electric machine, while maintaining a torque component at an essentially constant level. The system further has a control device configured to determine at least one parameter of the electric machine and operate the inverter in either a first or a second mode in response to the at least one determined parameter.