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. 19, 2006
Filed:
Apr. 08, 2004
Applicants:
Russell John Williamson, Patrickswell, IE;
Elizabeth Anne Lillis, Corbally, IE;
Inventors:
Russell John Williamson, Patrickswell, IE;
Elizabeth Anne Lillis, Corbally, IE;
Assignee:
Analog Devices, Inc., Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 7/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of synchronizing a pulsed drive signal applied to a DC fan motor to the TACH output of the motor is described. DC motors include a rotor that rotates in a path defined by a plurality of magnetic poles and the method defines an ideal TACH output for a specific rotation speed of the rotor of the DC fan and changes the period of the drive signal if the monitored TACH output does not match the ideal TACH output such that the period of the drive signal matches the time taken for the fan to rotate through one magnetic pole of the fan.