Can anyone give me a quick summary of what DC Bus Voltage actually is? I cannot actually find a good definition of it. Thanks!
A DC bus is a heavy conductor that distributes voltage. The bus voltage can be anything the circuit needs.
that's what i said... here's the full exam question so you have some context... The output shaft of a separately excited DC motor is rigidly coupled to the shaft of an AC synchronous machine The DC supply for the DC motor is fixed at 60 V. The motor has an armature resistance of 0.5 Q and its field current is controllable. The AC machine has 4 poles and is star connected. It has a synchronous reactance of 200 Q per phase and the machine is connected to a 3 phase 50 Hz infinite bus with line voltage 380 V.
So - In fact it's a synchronous AC machine connected to an infinite AC bus. The infinite AC bus is one in which it is assumed that no matter how much current (better yet - energy) you put into or take out of it, its voltage, phase relationship and frequency remain unchanged. It's a convenient means of analyzing certain synchronous machine modeling problems. It is an ideal construct that doesn't exist in reality but is helpful nonetheless.