The motor is what makes a ceiling fan turn the blades that create airflow. There are two different types of motors: AC (Alternating Current) and DC (Direct Current). Both convert electrical power to mechanical energy, but the difference is in the way they do it. AC motors work directly off of household alternating current, which comes from a home’s electrical grid, while DC motors first convert that alternating electricity into direct electricity using a transformer.
Once the motor is energized, it rotates a rotor within a stator that is designed with windings of insulated wire, creating magnetic force to turn the rotor. This rotation in turn drives the fan blades to create an updraft and pull air down into the room.
Several factors can affect a ceiling fan’s CFM: Motor size: A more powerful motor can move more air, resulting in higher CFM
Blade shape: The curved design of some blades can allow them to move more air than flat blades, again resulting in a higher CFM
Ceiling height: Higher ceilings require fans with a larger and more powerful motor, resulting in a higher CFM
In-built lighting: Some fans come with built-in lights that can be turned on and off using the remote control, or switched to “Night” mode, which dims the brightness of the light
Mechanical reversibility: The ability to switch from spinning counter-clockwise for updraft to clockwise for downdraft
All fans can be reversed by installing a simple adapter purchased from the manufacturer; however, older fans may have a mechanical reversing mechanism that requires the user to manually swap the blade pitches (with the upturned edge leading for downdraft and the downturned edge leading for updraft). This type of reversibility is not as easy to use as an electrically reversible motor.
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