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:
May. 04, 2010
Filed:
May. 03, 2007
Applicants:
Scott Frankel, Gilbert, AZ (US);
Eric Hardt, Phoenix, AZ (US);
Nigel D. Strike, Phoenix, AZ (US);
Inventors:
Assignee:
Minebea Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B 11/01 (2006.01); G05B 15/00 (2006.01); G01C 17/38 (2006.01); G01L 27/00 (2006.01); G01K 1/08 (2006.01); H05K 7/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of controlling a motor speed for a fan assembly includes receiving a duty cycle value at a microcontroller. The microcontroller receives a measured fan speed from a speed sensor. An expected fan speed is determined, where the expected fan speed corresponds to the duty cycle value. The measured fan speed is compared with the expected fan speed. A duty cycle of a motor driving signal is reduced if the measured fan speed is less than a predetermined fraction of the expected fan speed.