A dc series motor takes 18 A from a 220 V main and runs at a speed of 750 rpm. When this motor is run as a generator with its field separately excited, it generates an emf of 160 V at a speed of 900 rpm with 4 A as field current and it has been observed that the characteristic is linear from 4 A to 22 A. Calculate the speed of the motor when the series field is shunted by a 2 ohm resistance and the load torque is reduced 60 %. The motor has an armature resistance of 0.5 ohm and field resistance of 1 ohm. Neglect the effect of armature reaction.

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Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.