What is armature reaction explain various scenarios of armature reaction in synchronous generator?

What is armature reaction explain various scenarios of armature reaction in synchronous generator?

Armature reaction is a reduction in the magnetic flux density due to armature current creating a magnetic field that opposes the rotor field. Consider a rotating magnetic field and a multi-coil stator winding. As the magnetic field rotates, the voltage induced in each of the coils is in phase with the flux density.

What is the effect of armature reaction on performance of synchronous machine?

This reverse effect is referred as Armature Reaction in Synchronous Generator.So, according to armature reaction, flux is reduced or distorted, the net emf induced is also affected and hence the performance of the machine degrades.

What is armature reaction explain the effect of armature reaction on terminal voltage of an alternator at?

This reverse effect is referred as armature reaction in alternator or synchronous generator. In an alternator like all other synchronous machines, the effect of armature reaction depends on the power factor i.e the phase relationship between the terminal voltage and armature current.

In which generator does armature reaction occur?

In a DC generator, armature reaction means the effect of armature magnetomotive force on the fundamental wave of the main pole magnetic field under symmetrical load. It is assumed that the only magnetomotive force acting on the DC generator is generated by the stator magnetic field.

What is armature reaction in generator?

3.10 Armature reaction in d.c. generators. Armature reaction is the effect on the main field flux of that flux set up by the currents in the armature winding. 3.7 shows the two main poles of a d.c. generator and the distribution of the magnetic flux which crosses the airgap and enters the armature.

How do you stop an armature reaction?

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 armature reaction voltage?

Armature reaction is defined as the effect of armature flux on the main flux produced by the field poles. Upon giving mechanical input and field excitation, the alternator generates the AC voltage by Faraday’s law of Electromagnetic induction. The distortion may depend on the type of load applied to the alternator.

Is armature reaction good or bad?

Due to the above two effects of armature mmf, there are many detrimental effects on the Electrical machine. Distortion of Main Field Flux gives rise to three detrimental effects: Rise in Iron Loss, Poor Commutation and Sparking in Carbon Brushes.

What is armature reaction in generators?