Ac dc and ac fan fan fan manufacturers difference: ac fan fan ac power supply for communication, power supply voltage will be positive and negative alternating, unlike dc fan power supply voltage is fixed, xu will depend on the circuit control, make two sets of coil turns work can produce different magnetic field.
Due to the power frequency fixed exchange fan, silicon steel sheet produced by pole change speed, decided by the power frequency, the higher the frequency of magnetic switch, the faster speed will be faster in theory, like the more the more the number of dc fan speed fast principle.
Frequency, however, cannot too fast, too fast will cause problems start.
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Cpid = 114 auto cooling fan at http:///products-
cpid = 121