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:
Oct. 24, 2006
Filed:
Sep. 16, 2004
John David Paulson, West Fargo, ND (US);
Brian Frederick Boeshans, Fargo, ND (US);
Jeffrey Gerald Hopman, Horace, ND (US);
Robert Boyd Shaw, Fargo, ND (US);
John David Paulson, West Fargo, ND (US);
Brian Frederick Boeshans, Fargo, ND (US);
Jeffrey Gerald Hopman, Horace, ND (US);
Robert Boyd Shaw, Fargo, ND (US);
Deere & Company, Moline, IL (US);
Abstract
A system and method detects coil-to-coil faults in an electric motor having a plurality of coils. The method includes applying a square wave signal to a first coil of the motor, connecting a capacitor and a resistor between ground potential and a second coil of the motor, applying the coil output voltage to an amplifying and peak detecting circuit, applying an output of the amplifying and peak detecting circuit to the input of the control unit and, after a delay period, generating a motor fault signal if the coil output voltage is below a predetermined threshold. The square wave signal is amplified by a circuit which prevents transmission of voltage signals from the coils to the output of the control unit during normal operation of the motor.