In a three-phase induction motor, the number of poles in the rotor winding is always__________?
Correct answer: D. equal to number of poles in stator
- A. zero
- B. more than the number of poles in stator
- C. less than number of poles in stator
- D. equal to number of poles in stator
Explanation
The rotor current is induced by the stator’s rotating magnetic field, so the rotor magnetic field has the same number of poles as the stator field. This pole matching is necessary for continuous torque production.
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