MICROCONTROLLER METHODS OF IMPROVING RELIABILITY IN DC BRUSHLESS MOTORS AND COOLING FANS

摘要

A method of controlling a motor speed for a fan assembly includes receiving a duty cycle value at a microcontroller. The microcontroller receiveds 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 lass than a predetermined faraction of the expected fan speed.