What are the two main parts of an AC induction motor?

• A. Stator and Rotor
• B. Windings and Bearings
• C. Frame and Housing
• D. Armature and Commutator

Answer: (A)

The essential setup of an AC induction motor is a stationary magnetic source and a moving part that converts that magnetic field into motion. The stationary component is the stator, which contains the windings that, when energized with AC, produce a rotating magnetic field. Inside it sits the rotor, the part that spins and is connected to the shaft. As the rotating field sweeps past the rotor conductors, currents are induced in the rotor and interact with the field to generate torque, making the rotor turn. The rotor is typically a squirrel-cage or wound-rotor design, and the motor has no commutator, unlike DC machines. Other items like windings and bearings or the frame and housing are important to the motor’s construction, but they’re not the two main functional parts.