Patent ID: 8436566

Claim:
A multi-speed control apparatus for a fan motor, comprising: a motor speed detection member for generating a feedback signal in response to a rotating speed of the fan motor; a resistor circuit, having resistor elements with various resistances; a voltage-division resistor; a multi-segment switch, electrically interconnecting the resistor circuit, the voltage-division resistor, and a voltage source, wherein the multi-segment switch optionally connects any one of resistor element to the voltage source and the voltage-division resistor for creating an input voltage across the resistor element by dividing voltage; and a driving member, having a detection end, a controlled end, and an output end, wherein the detection end is connected with the motor speed detection member, the controlled end is connected with the multi-segment switch, and the output end is connected with the fan motor; wherein the detection end receives the feedback signal, the controlled end receives the input voltage via the multi-segment switch, and the driving member is used to drive the fan motor to a specific rotating speed according to the input voltage.