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?

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Induction Machines topics include: Principles of operations, rotor frequency, equivalent circuit and its analysis, induction motor phasor diagram and its operating characteristics, induction generator, circle diagrams of induction machines, flux, mmf phase and waves in induction motors. Induction motors are AC electric motors that use electromagnetic induction to produce torque. They have two main components: Stator: The stationary part of the motor that contains a housing with slots and a series of windings. The stator's winding creates a magnetic field that rotates in synchronism with the... Show more

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?