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A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the stator field revolving rotor structure is?(a) 157 rad/s(b) 150 rad/s(c) 6.28 rad/s(d) 145 rad/sThis question was addressed to me in an online quiz.The origin of the question is Rotor Frequency in division Induction Machines of Electrical Machines

Answer»

Right CHOICE is (C) 6.28 rad/s

For EXPLANATION I would say: Speed of the STATOR field REVOLVING rotor structure = 1550-1440 = 60 rpm = 6.28 rad/s.



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