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. 08, 2011
Filed:
Sep. 15, 2008
Benjamin P. Gottemoller, Peoria, IL (US);
Benjamin Miller, Peoria, IL (US);
Tamran H. Lengyel, Peoria, IL (US);
Benjamin P. Gottemoller, Peoria, IL (US);
Benjamin Miller, Peoria, IL (US);
Tamran H. Lengyel, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A cooling system for a retarding system of an electric drive machine () includes a direct current (DC) link having first and second rails. A first resistor grid () is selectively placed in circuit between the rails by an automatic switch () in response to a switch () signal. A second resistor grid () is selectively placed in circuit between the rails by a chopper circuit () connected in series with the second resistor grid (). The chopper modulates a current passing therethrough based on a duty cycle. A motor () is in parallel electrical connection across a portion of the first resistor grid () and operates in response to a motor () signal. An electronic controller () calculates a net energy during operation and adjusts the switch () signal, the duty cycle, and the motor () signal to close the automatic electrical switch () and operate the motor () when the net energy exceeds a threshold value.