Patent ID: 6256181
Filing Date: 2001-07-03
Classification: H02H,H02P

Abstract:
A fan drive device for drive control of a direct current, brushless fan drive motor having a plurality of sensors for converting to and outputting as a two-value signal a change in magnetic pole position resulting from rotation of a fan drive motor rotor magnet in the direct current, brushless fan drive motor, said fan drive device comprising:a drive circuit section for driving the direct current, brushless fan drive motor; anda control circuit section for controlling said drive circuit section according to an output signal from each sensor in the fan drive motor,wherein said control circuit section prohibits said drive circuit section from driving the direct current, brushless fan drive motor when the direct current, brushless fan drive motor is not being driven by said drive circuit section and the direct current, brushless fan drive motor speed is detected to exceed a specific speed based on signals output from the plurality of sensors.