| 摘要 |
PURPOSE: A single-phase DC brushless axial fan motor is provided to enable a computer to perform an exact monitoring with respect to a number of rotation or a cooling effect of a fan motor. CONSTITUTION: A power terminal part(10) has the first, second and third terminals, and supplies a power through the first and the second terminal. A hall element part(HE) consecutively outputs the first signal having "+" wave form and the second signal having "-" wave form. A bias resistance is interposed between the first terminal and the hall element part to bias the hall element part. The first amplifier(A) conducts a non-inverting amplification with regard to the first signal and outputs a non-inverting current. The second amplifier(B) conducts an inverting amplification with regard to the second signal and outputs an inverting current. A coil part(20) has the first coil and the second coil connected to the first amplifier and the second amplifier, and rotates a fan motor by exciting of the first and the second coil part.
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