Consider a motor supplied by a generator, each with a separate and constant field excitation. Assume the internal voltage E of the generator to be constant, and neglect the armature reaction of both machines. With the motor running with no external load, and the system being in steady state, let a load torque be suddenly increased from zero to T. The machine parameters are as follows:
Armature inductance of motor + generator, L = 0.008 H
Armature resistance of motor + generator, R = 0.04 Ω
Internal voltage of the generator E = 400 V Moment of inertia of motor armature and load
(a) The undamped angular frequency of the transient speed oscillations, and the damping ratio of the system.
(b) The initial speed, final speed, and the speed drop in r/min.