A 50 Hp 250V, 1200 R/Min DC shunt motor with compensating winding has an armature resistance (including the brushes, compensating winding, and interpole) of 0.06 ohms. If the field resistance (Radj + Rf) is 50 ohms, which produces a no-load speed of 1200 r/min. There are 1200 turns per pole on the shunt field winding.
Find the speed of the motor when its input current is 100A, 200A, and 300A.
Plot the speed-torque characteristic of the above machine.