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. 13, 2009
Filed:
Mar. 28, 2007
Applicant:
David Kyle Mackay, Oakville, CA;
Inventor:
David Kyle MacKay, Oakville, CA;
Assignee:
Agile Systems Inc., Waterloo, Ontario, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K 23/00 (2006.01); H02P 6/02 (2006.01); H02P 7/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the motor at a sampling frequency at least two times greater than the PWM frequency to obtain over-sampled back EMF readings. The oversampled readings may be used in a raw or filtered form to commutate the motor. A system implementing the method is also described.