Induction Cup Relay Construction
Note: If you know the working of induction motor,then this article will be very easy to understand read working of induction motor here
2.Hollow cylindrical cup acts as rotor similar to a disc in other two relays. It is free to rotate in air gap between electromagnet and stationary iron core.
4.Induction cup relay consist of two pairs of coil, when these coils are energized, flux is produced in the coils. These fluxes will have same frequency but will have phase delay (0 to ∞ ). These coils will then energize iron core thus producing a rotating flux in the air gap.