AC induction motors are typically described as:

• A. Always brushless
• B. Not brushless
• C. Sometimes brushless
• D. Brushless by design

Answer: (D)

AC induction motors rely on a rotating magnetic field created in the stator by the AC supply, while the rotor carries induced currents and follows that field. Because there is no mechanical commutation or brushes involved in normal operation, these motors are described as brushless by design. There are some induction motor variants, like wound-rotor types with slip rings and occasional brushes, but the typical and most common description for an AC induction motor is brushless by design.