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:
Jan. 07, 2014
Filed:
Dec. 09, 2011
Ahmed Khalil, Peoria, IL (US);
Jackson Wai, Dunlap, IL (US);
Jesse Gerdes, Dunlap, IL (US);
James Siegle, Peoria, IL (US);
Mark Hartman, Peoria, IL (US);
Joshua Williams, Peoria, IL (US);
Ahmed Khalil, Peoria, IL (US);
Jackson Wai, Dunlap, IL (US);
Jesse Gerdes, Dunlap, IL (US);
James Siegle, Peoria, IL (US);
Mark Hartman, Peoria, IL (US);
Joshua Williams, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A method of controlling a motor is provided. The method may determine a speed of the motor, and engage a soft chopping routine on a first switch and a second switch of each phase if the motor speed is relatively low. The first switch may be driven by a first pulse width modulated PWM signal and the second switch being driven by a second PWM signal. The first and second PWM signals may be alternatingly configured such that at least one of the first switch and the second switch is closed at any point during the distributed soft chopping routine and both the first switch and the second switch are never simultaneously open.