Microcontroller methods of improving reliability in DC brushless motors and cooling fans
US7605556B2 · kind B2 · utility
7Cited by
22References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 2007 |
| Grant date | Oct 20, 2009 |
| Priority date | — |
| Expiry date | Jul 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K7/20209
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.