In an AC induction motor, the stationary part called the stator is responsible for inducing the current flow in the rotating rotor, working on the principle of electromagnetic induction similar to transformers.
The part of an AC induction motor that induces the current flow in the rotor is called the stator. Induction motors contain two main parts: the stationary stator and the rotating rotor. The stator is the component which creates the rotating magnetic field that induces currents in the rotor, hence enabling it to turn. This process leverages Faraday's law of induction, analogous to how a transformer operates.
In a transformer, the primary coil's time-varying magnetic flux induces an AC voltage in the secondary coil. Similarly, the stator's alternating magnetic field induces currents within the rotor. The back electromotive force (back emf) is produced as the rotor rotates, which opposes the input voltage supplied to the motor. This is a crucial aspect as the emf regulation contributes to the motor's overall efficiency.
So, when considering AC induction motors, it is the stationary stator that is responsible for inducing current in the rotor.