Polar Zone Flashcards
What is the primary function of interpoles in a generator?
Eliminate the effects of armature reaction in the interpolar zone
This allows the neutral plane to remain fixed in the no-load position regardless of the load.
What happens to the generated voltage in the polar zone of a generator?
It experiences distortion of the waveform and a reduction in generated voltage
This occurs due to the distortion of the flux pattern and saturation of the iron in that area.
What is the relationship between generated emf and total flux?
Generated emf is proportional to the amount of flux
A reduction in total flux leads to a reduction in generated emf.
How do compensating windings work in a generator?
They carry current in the opposite direction to adjacent armature windings
This cancels out the magnetomotive force, eliminating armature reaction effects in the polar zone.
Where are compensating windings typically located?
In slots or holes in the main pole faces of the pole shoe
They run parallel to the armature conductors.
What size motors typically use compensating windings?
Motors larger than 100 hp
Compensating windings are not common in smaller motors.
True or False: Compensating windings are commonly used in all types of generators.
False
They are primarily seen in larger motors.
Fill in the blank: The _______ winding is connected in series with the armature.
compensating
This is essential for the flux of the compensating winding to vary in proportion to the armature flux.
What is the effect of pole face design on flux distortion?
It can reduce the problem but will not eliminate it
Distortion of the field in the polar zone remains unaffected.
What is the purpose of commutating windings?
To assist in the commutation process within the generator
They are crucial for maintaining efficient operation.
What is the typical appearance of compensating windings?
They resemble busbars rather than traditional windings
This design is due to their location and function.
