Method of controlling speed of brushless motor of ceiling...

Details Method of controlling speed of brushless motor of ceiling... Method of controlling speed of brushless motor of ceiling...

2011-08-09

2011-08-09

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

C318S400030, C318S430000

Reexamination Certificate

active

07994744

ABSTRACT:
The present invention relates to a method and a circuit of controlling a speed of a brushless motor of a ceiling fan. The circuit includes a motor PWM duty consumption sampling unit and a motor speed sampling to sense a PWM duty and a speed of the brushless motor. A central processing unit is provided to compare the PWM duty and the speed of the brushless motor to a preset maximum PWM duty and a preset maximum speed. When the PWM duty reaches to the preset maximum PWM duty first, the central processing unit sets the current speed to be a maximum speed, and speeds of each level are calculated according to the maximum speed. If the speed reaches to the preset maximum speed first, a constant-speed control will take over to control the brushless motor, and speeds of each level are according to the preset speeds.

REFERENCES:
patent: 4546293 (1985-10-01), Peterson et al.
patent: 5309077 (1994-05-01), Choi
patent: 5748206 (1998-05-01), Yamane
patent: 2007/0182350 (2007-08-01), Patterson et al.

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