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:
Dec. 27, 2011
Filed:
Dec. 22, 2008
Bin LU, Kenosha, WI (US);
Charles John Luebke, Sussex, WI (US);
Thomas G. Habetler, Snellville, GA (US);
Pinjia Zhang, Atlanta, GA (US);
Scott K. Becker, Oak Creek, WI (US);
Bin Lu, Kenosha, WI (US);
Charles John Luebke, Sussex, WI (US);
Thomas G. Habetler, Snellville, GA (US);
Pinjia Zhang, Atlanta, GA (US);
Scott K. Becker, Oak Creek, WI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A system and method for measuring and controlling stator winding temperature in an AC motor while idling is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of a multi-phase AC motor. The circuit further includes a plurality of switching devices to control current flow and terminal voltages in the multi-phase AC motor and a controller connected to the circuit. The controller is configured to activate the plurality of switching devices to create a DC signal in an output of the motor control device corresponding to an input to the multi-phase AC motor, determine or estimate a stator winding resistance of the multi-phase AC motor based on the DC signal, and estimate a stator temperature from the stator winding resistance. Temperature can then be controlled and regulated by DC injection into the stator windings.