Generally AC fans use a capacitor bank to alter the fan's speed. The switch connects the capacitors in various combinations to achieve the desired output.
Since the switching is done at mains level you need mains-capable relays, and a safe enclosure. You can replicate the rotary switch contact configuration with several relays and use them in place of the switch. Don't forget, when you start the fan you must select the fastest speed first, then turn down to lower speeds if desired. The high speed setting gives enough power to the motor to get the fan moving.
Probably you should get a new fan with infrared, Bluetooth, or WiFi control. Then you won't risk killing or injuring yourself.
Since the switching is done at mains level you need mains-capable relays, and a safe enclosure. You can replicate the rotary switch contact configuration with several relays and use them in place of the switch. Don't forget, when you start the fan you must select the fastest speed first, then turn down to lower speeds if desired. The high speed setting gives enough power to the motor to get the fan moving.
Probably you should get a new fan with infrared, Bluetooth, or WiFi control. Then you won't risk killing or injuring yourself.
Statistics: Posted by ame — Fri May 23, 2025 2:17 am