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A 4-pole, 3-phase slip ring induction motor is used as a frequency changer. Its stator is excited from 3-phase, 50 Hz supply. A load requiring 3-phase, 20 Hz supply is connected to the star-connected rotor through three slip-rings of SRIM. At what two speeds the prime mover should drive the rotor of this SRIM?(a) 900 rpm(b) 600 rpm(c) 1500 rpm(d) 0I have been asked this question during an interview for a job.The query is from Rotor Frequency topic in chapter Induction Machines of Electrical Machines |
Answer» Right ANSWER is (a) 900 rpm |
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