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Differences between AC and DC Fans

A fan motor is a component in a home's heating, ventilation and air conditioning (HVAC) system. This component works to produce cool air and keep your system's compressor from overheating, which can lead to poor cooling performance and possibly failure.

The basic design of a fan motor is simple and relies on the concept of electromagnetic induction. This means that an applied source of alternating current energizes a coil on the stator, creating a magnetic field.

This causes the rotor, which sits in the center of this magnetic field, to spin, turning both fan blades and making the fan oscillate on its stand. The rotor also generates torque, which drives the fan blades and can help your system run more efficiently.

Differences between AC and DC Fans
Ceiling fan motors are primarily made up of two parts: the rotor and the stator. The rotor, which is made from free-spinning magnetized iron, sits in the center of a magnetic field created by the stator.

In the case of an AC motor, the rotor's north pole is always above the axle, which allows it to repel the stator's south pole and attract the stator's north pole. This creates a more powerful and dynamic rotor than one that sits perfectly horizontal between the stator's poles.