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:
Feb. 28, 2006
Filed:
Sep. 21, 2004
Patrick A. O'gorman, Grayslake, IL (US);
Scott W. Repplinger, Lake Zurich, IL (US);
Dennis L. Stephens, Barrington, IL (US);
Patrick A. O'Gorman, Grayslake, IL (US);
Scott W. Repplinger, Lake Zurich, IL (US);
Dennis L. Stephens, Barrington, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A system and method for reducing torque ripple in a motor controller includes a step () of measuring an output voltage at each phase of the motor controller. A next step () includes determining a voltage mismatch between the phases. A next step () includes phase grounding one phase of the motor. A next step () includes calculating a voltage gain for the phases to compensate for voltage mismatches therebetween. The compensating gain can include a gain and/or offset, which are applied as a function of motor angle and is used to generate a PWM signal for driving the motor with reduced torque ripple.