As the alternating current passes through the motor of an ac fan it can induce a hum causing the noise but a dc fan does not have same wave form in the power and hence it cannot induce a hum in the motor.
Ceiling fan motors ac or dc.
We know it s a little confusing alternating current motors handling power directly direct current motors converting the power let s look at the advantages of both ceiling fan motor types now.
The advantages of a dc motor ceiling fan over an ac motor ceiling fan.
If you search the internet for the differences between ac and dc fans you may find statements that dc fans are more efficient.
Advantages of ac ceiling fans.
In contrast the alternating current fans or ac fans are powered with a changing voltage of positive and of equal negative value in general this changing voltage has sinusoidal shape.
It is possible to convert ac power to dc power as is done with many of the electronics we use.
They are generally extremely quiet.
Dc fans usually cost more while there are quite a few dc models on the market at the time of writing this most dc fans started at 300 and up.
Conversely searching for information for ac versus dc motors may result in information saying ac motors are more efficient.
The fanimation odyn led indoor outdoor ceiling fan moves some serious air with its 7 foot blade span while its dc motor consumes up to 70 less energy than standard ac.
In most cases they use less energy up to 70 less than a standard ac fan.
The direct current fans or dc fans are powered with a potential of fixed value such as the voltage of a battery typical voltage values for dc fans are 5v 12v 24v and 48v.