Which element is crucial for the operation of an AC motor?

The operation of an AC motor fundamentally relies on the presence of a rotating magnetic field. This rotating magnetic field is created by the application of alternating current to the windings of the motor, which generates magnetic fields that change direction over time. The interaction of these magnetic fields produces torque, allowing the rotor to turn and effectively perform mechanical work.

In an AC motor, especially in types like induction motors, this rotating magnetic field is essential for inducing current in the rotor, leading to the rotor's movement. The efficiency and performance of the motor are directly influenced by the characteristics of the rotating magnetic field, such as its speed and strength. This mechanism distinguishes AC motors from other types, as the rotating magnetic field is critical for their operation.