On the market "Micro Cooling Fan", according to the motor used, divided into condenser fans and shaded pole fan. Shaded pole electric fans use shaded pole motor, also known as shaded pole motors. Early production of fans, mostly using this motor. This "Micro Cooling Fan" has the advantage of simple structure, easy manufacturing, easy maintenance, low cost, reliable, low noise, radio interference-free, the disadvantage is low efficiency, torque is small, low power consumption and more generally for small size (250m. or less) fan. Large size (300mm or more) with a few fans. Capacitor run type "Micro Cooling Fan" capacitive motors. Such motor starting torque, starting current, at low voltage case can be started, high efficiency, low noise, power consumption is low, so most of the current production of fan operation using capacitive type, 300mm more fans use this motor.