| 摘要 |
PROBLEM TO BE SOLVED: To provide a fan-motor drive circuit capable of stabilizing the revolution of a brushless fan motor by a Hall device electric circuit, stabilizing the revolution of the motor with respect to the changes in the ambient temperature, and furthermore, reducing the vibration in the sine-wave drive. SOLUTION: A capacitor 4 is connected, in parallel to junctions between the output terminals of a Hall device 1 and the input terminals of an IC 5, which switches the polarity of a current applied to a coil 6 by the detection signal of the Hall device 1. The capacitance of the capacitor 4 is set to be a value which corresponds to the revolution of a motor. The input impedance of the IC 5 is set sufficiently larger than the output impedance of the Hall device 1. The increase in the revolution can be suppressed by the action of the capacitor 4, and the revoltion can be stabilized.
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