What is meant by armature reaction?
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What is meant by armature reaction?
Definition of armature reaction : a magnetomotive force set up by the current induced in the armature of a dynamo that results in altering as to both magnitude and direction the flux due to the field magnet.
What is armature reaction in alternators and what effect will it produce for pure capacitive and RL load?
Armature Reaction in Alternator When Load Power Factor is Zero Leading. When a pure capacitive load (zero p.f. leading) is connected across the terminals of the alternator, the current in armature windings will lead the induced e.m.f. by 90°.
What is the function of armature?
Armature – It is a rectangular coil that is placed in a uniform magnetic field. The main function of the armature is to rotate the shaft or axel to which it is attached. Brushes – They are attached (not fixed) to the split rings.
What is the effect of armature reaction at different power factors on synchronous machine?
Lagging Power Factor Load:
| Sr. No. | Loading Condition | Effect of Armature Reaction |
|---|---|---|
| 1) | No Load | No effect |
| 2) | Unity Power Factor | Cross-magnetizing |
| 3) | Zero Power Factor Lagging | Purely demagnetizing |
| 4) | Zero Power Factor Leading | Purely magnetizing |
What are disadvantages of armature reaction?
The adverse effects of armature reaction: Armature reaction weakens the main flux. In case of a dc generator, weakening of the main flux reduces the generated voltage. Armature reaction distorts the main flux, hence the position of M.N.A. gets shifted (M.N.A. is perpendicular to the flux lines of main field flux).
What is armature reaction and how it can be reduced?
Explanation: Armature reaction can be reduced with the help of compensating winding. To neutralize the cross-magnetizing effect of armature reaction in a DC machine, a compensating winding is used. The compensating windings consist of a series of coils embedded in slots of the pole faces.