Patent ID: 7994744

Claim:
A method of controlling a speed of a brushless motor of a ceiling fan, comprising the steps of: speeding up the brushless motor; sensing a speed and a pulse width modulation (PWM) duty of the brushless motor; and comparing the speed of the brushless motor with a preset maximum speed, and comparing the PWM duty of the brushless motor with a preset maximum PWM duty; wherein when the PWM duty of the brushless motor is identical to the preset maximum PWM duty and the speed of the brushless motor is less than the preset maximum speed, the speed of the brushless motor is set to be a maximum speed, and when the speed of the brushless motor is identical to the preset maximum speed and the PWM duty of the brushless motor is less than the preset maximum PWM duty, the brushless motor is stopped speeding up and a constant-speed control will control the brushless motor according to preset speeds of each level.