Objective 1 Mod C Flashcards
What is the effect of current in the armature windings of a generator under load?
Current produces magnetic flux in the armature
This flux interacts with the main field flux from the field coils.
What are the two sources of flux in a generator under load?
- Main field flux produced by the field coils on the poles
- Armature flux produced by the current in the armature windings
How does the armature flux affect the main field flux in a generator?
It weakens and distorts the main flux.
What happens to the neutral plane when a load is connected to a generator?
The neutral plane shifts in the same direction that the armature rotates.
What occurs during commutation when the armature coil being shorted out has a voltage across it?
Arcing occurs as the brushes move between commutator segments.
What is the result of one tip of each of the pole shoes becoming saturated?
The total flux produced by the field pole is reduced.
What is the consequence of reduced total flux in a generator?
Less voltage is induced in the armature windings, leading to reduced voltage output by the generator.
What is armature reaction?
The distortion of the flux pattern in the machine caused by the cross-magnetizing effect of the armature-current flux.
Fill in the blank: The commutation process is similar for armature windings that have more _______.
[coils and commutator segments]
True or False: The armature reaction can lead to increased voltage output in a generator.
False
