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
![2460_8eabf575-f40f-4a50-b5e1-a03cbda2b8fa.png](https://secure.tutorsglobe.com/CMSImages/2460_8eabf575-f40f-4a50-b5e1-a03cbda2b8fa.png)
(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.