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A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the rotor field w.r.t. rotor structure is?(a) 157 rad/s(b) 150 rad/s(c) 6.28 rad/s(d) 145 rad/sI have been asked this question during an interview.The query is from Rotor Frequency topic in chapter Induction Machines of Electrical Machines

Answer» CORRECT option is (c) 6.28 rad/s

The best I can explain: Speed of the rotor FIELD w.r.t. rotor structure= 120*rotor frequency/Poles = 120*2/4 = 60 RPM = 6.28 rad/s.


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