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For a 4-pole, 3-phase induction motor the rotor speed found is 2100 rpm at 50 Hz. Then the phase sequence of the emf generated will be?

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For a 4-pole, 3-phase induction motor the rotor speed found is 2100 rpm at 50 Hz. Then the phase sequence of the emf generated will be?

(a) acb

(b) abc

(c) no emf will be induced

(d) cba

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The above asked question is from Rotor Frequency in division Induction Machines of Electrical Machines

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Correct answer is (a) acb

The best explanation: Stator field will be running at the speed of 600 rpm anticlockwise wrt to rotor. So the phase sequence generated at the slip rings is reversed.

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