In an alternator, which component rotates to induce current in the stator?

In an alternator, which component rotates to induce current in the stator?

• A. Rotor
• B. Stator
• C. Armature core
• D. Field coil

Answer: (A)

The rotating part is the rotor. In an alternator, the rotor carries the field windings and, when supplied with DC excitation, creates a magnetic field that spins with the rotor. As this magnetic field sweeps past the stationary windings of the stator, the changing magnetic flux induces AC voltage in those stator windings according to Faraday’s law. The stator remains fixed and provides the output, while the rotor provides the moving magnetic field that drives the induction. The armature core simply concentrates flux, and the field coil’s job is to establish the magnetic field on the rotor; it’s the rotation of that field with the rotor that induces current in the stator.

The rotating part is the rotor. In an alternator, the rotor carries the field windings and, when supplied with DC excitation, creates a magnetic field that spins with the rotor. As this magnetic field sweeps past the stationary windings of the stator, the changing magnetic flux induces AC voltage in those stator windings according to Faraday’s law. The stator remains fixed and provides the output, while the rotor provides the moving magnetic field that drives the induction. The armature core simply concentrates flux, and the field coil’s job is to establish the magnetic field on the rotor; it’s the rotation of that field with the rotor that induces current in the stator.