Patent ID: 7805063

Claim:
A speed control system for a brushless permanent magnet DC motor for a ceiling fan comprising: a power circuit 1 having an input terminal and an output terminal; a microprocessor circuit 2 having an input terminal and an output terminal; a power drive circuit 3 having an input terminal and an output terminal; a speed regulation circuit 4 , 7 having an output terminal; and a brushless DC permanent magnetic motor 5 ; wherein said input terminal of the power circuit 1 is directly connected to an output terminal 101 of an AC power source; said output terminal of the power circuit 1 directly provides power to said microprocessor circuit 2 , said power drive circuit 3 , and said speed regulation circuit 4 , 7 ; said output terminal of the microprocessor circuit 2 is directly connected to said input terminal of said power drive circuit 3 ; said output terminal of said power drive circuit 3 is directly connected to coil windings 501 of the motor; said output terminal of said speed regulation circuit is directly connected to said input terminal of said microprocessor circuit 2 ; said speed regulation circuit comprises a wireless speed regulation circuit 4 and a wired speed regulation circuit 7 simultaneously; and said wire speed regulation circuit 7 comprises a manual control box 701 and an optoelectronic isolating circuit 702 having an output terminal and an input terminal and said output terminal of the manual control box 701 is directly connected to the input terminal of the optoelectronic isolating circuit 702 , the output terminal of optoelectronic isolating circuit 702 is directly connected to the input terminal of the microprocessor circuit 2 , and said wired speed regulation circuit is not directly connected to said brushless DC permanent magnetic motor 5 .