Table of Contents
What is armature equation?
k=ZP2π results in the armature voltage equation. EA=kϕωm. Similarly to the general voltage derivation, the torque on a single conductor can be written as. τav=rlBavi.
What are the two effects of armature reaction?
Armature reaction has two undesirable effects: First, it distorts the main field. Secondly, it reduces the main field flux or both. When the main field is distorted, then there will be a cross magnetizing effect.
What is armature reaction with diagram?
The current flowing through the armature conductors creates a magnetic field, which is called as armature flux. This armature flux distorts and weakens the magnetic flux produced by the main poles. This effect of armature flux on the main flux is known as armature reaction.
What is armature reaction and its effect?
What is armature reaction & List effects?
Definition: The armature reaction simply shows the effect of armature field on the main field. In other words, the armature reaction represents the impact of the armature flux on the main field flux. The armature field is produced by the armature conductors when current flows through them.
What is the effect of armature reaction in a motor?
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 in AC generator?
When the alternator is loaded, the armature currents are set up which produce the armature flux. This armature flux modifies the main flux in the air gap of the machine. This action of armature flux is called armature reaction.
What is armature reaction in DC machine PDF?
Armature Reaction: The effect of magnetic field set up by armature current on the distribution of flux under main poles of a generator. The armature magnetic field has two effects: (i) It demagnetises or weakens the main flux and (ii) It cross-magnetises or distorts it.
What is the role of armature reaction in any machine?
What produces armature reaction?
What is meant by armature reaction in a DC motor?
What is armature reaction and how can it be Minimised?
1) The armature reaction causes the distortion in main field flux. This can be reduced if the reluctance of the path of the cross-magnetizing field is increased. The armature teeth and air gap at pole tips offer reluctance to armature flux. Thus by increasing length of air gap, the armature reaction effect is reduced.
What is the effect of armature reaction in DC machine?
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).