The discussion revolves around the use of capacitors in fans, particularly focusing on the technical reasons for their inclusion in fan motors. Participants explore the role of capacitors in both AC and DC powered fans, with an emphasis on single-phase induction motors commonly found in ceiling fans.
Participants have not reached a consensus, as there are multiple competing views regarding the specifics of how capacitors function in different types of fan motors. The discussion remains unresolved, particularly due to the lack of response from the original poster.
There are limitations regarding the assumptions made about the type of fan motor (AC or DC) and the specific role of the capacitor, which are not fully explored in the discussion.
Welcome to the PF.7see said:
One thing I have learned over the years here on PF is to not hold your breath with first time posters. Without knowing if the fan motor is AC or DC we cannot know which answer is appropriate.aaronrodg said:
For ceiling fans (and other fans that operate directly on ac mains), the motors used are single phase induction motors. Capacitor creates a phase difference between the currents in starting and running windings of the motor, hence giving rise to a rotating magnetic field in the rotor. The rotating magnetic field will drag the rotor along with it, just like in case of a 3-phase induction motor. This motor is also called a CSCR (Capacitor Start Capacitor Run) motor.aaronrodg said: