In a three-phase induction motor powered by a three-phase supply, what kind of field is produced?

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Multiple Choice

In a three-phase induction motor powered by a three-phase supply, what kind of field is produced?

A rotating magnetic field is produced. With a balanced three‑phase supply, each stator winding creates its own magnetic field, and those three fields are 120 degrees apart in time. When combined, their fields form a single resultant magnetic field that moves around the stator like a rotating wave. This rotating magnetic field sweeps past the rotor, induces currents in the rotor conductors, and creates torque that drives the motor. It’s a magnetic field, not a stationary one, and not an electric field, and it’s far from non-magnetic. The rotation speed of this field is tied to the supply frequency and the motor’s pole count, known as synchronous speed.

A rotating magnetic field is produced. With a balanced three‑phase supply, each stator winding creates its own magnetic field, and those three fields are 120 degrees apart in time. When combined, their fields form a single resultant magnetic field that moves around the stator like a rotating wave. This rotating magnetic field sweeps past the rotor, induces currents in the rotor conductors, and creates torque that drives the motor. It’s a magnetic field, not a stationary one, and not an electric field, and it’s far from non-magnetic. The rotation speed of this field is tied to the supply frequency and the motor’s pole count, known as synchronous speed.

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