🔍 Key Concepts

• Rotating magnetic field produced by the stator of an AC induction motor • Rotor currents induced by the rotating magnetic field (no brushes in a standard squirrel‑cage induction motor) • Relationship between the direction of the stator’s rotating field and the mechanical rotation of the rotor

💭 Think About

• Think about what actually makes the rotor turn in an AC induction motor: is it pushed by, pulled by, or opposed by the stator’s rotating magnetic field? • Which motor type actually uses brushes, and are they relevant to a typical AC induction (squirrel‑cage) motor? • Ask yourself: if you swap any two supply phases on a three‑phase induction motor, what happens to the direction of the rotating magnetic field, and what then happens to the rotor?

✅ Before You Answer

• Verify that a standard AC induction motor does not rely on brushes for normal operation, so any answer focused on brush staggering may be suspect. • Confirm whether the rotor tends to follow or oppose the direction of the stator’s rotating magnetic field in order to develop torque. • Check that the number of poles affects synchronous speed (rpm), not the fundamental direction of rotation for a given phase sequence.