| 摘要 |
PURPOSE: A ventilation fan motor is provided to be capable of minimizing a power consumed to rotate a ventilation fan and increasing a variation range of a rotation number of the ventilation fan according to load increase. CONSTITUTION: A stack core(100) has a rotator insertion hole(101) formed to be penetrated in a stack structure where a plurality of stack boards are stacked and a bobbin connection hole formed at one side, and is fixed at a cooling room of a main body. A bobbin(120) is formed with a ring shape and a coil is wound inside the bobbin. One side of the bobbin is inserted in the bobbin connection hole. A rotator(130) is formed of a ring-shaped permanent magnet and is inserted in the rotator insertion hole of the stack core so as to be rotated. A motor shaft(140) is fixed at the center of the rotator and a ventilation fan(80) is installed at one side of the motor shaft. A sensor(170) is installed at a side of the rotator and senses a polarity of the rotator. A controller(180) controls a current applied to the winding coil of the bobbin according to a sense result of the sensor.
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