What is armature reaction explain?

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.

Does an AC generator have an armature?

Armature. The part of an AC generator in which the voltage is produced is known as an armature. This component primarily consists of coils of wire that are large enough to carry the full-load current of the generator.

What is armature reaction effect in alternator?

The effect of Armature (stator) flux on the flux produced by the rotor field poles is called Armature Reaction. When the current flows through the armature winding of the alternator, a flux is produced by the resulting MMF.

Why does an armature is used as a stator in an AC generator?

In the rotating armature AC generator as illustrated in Figure 1, the stator provides a stationary electromagnetic field. The rotor, acting as the armature, rotates in the field, cutting the lines of force and producing the desired output voltage.

What is meant by armature reaction in a dc motor?

The armature reaction is the effect of the armature flux on the main flux. In case of a DC motor the resultant flux is strengthened at the leading pole and weakened at the trailing pole tips.

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

As soon as current starts flowing through the armature conductor there is one reverse effect of this current on the main field flux of the alternator (or synchronous generator). In other words, the effect of armature (stator) flux on the flux produced by the rotor field poles is called armature reaction.

Where is armature in AC generator?

The armature is contained within the windings of the stator and is connected to the output. Each time the rotor makes one complete revolution, one complete cycle of AC is developed. A generator has many turns of wire wound into the slots of the rotor.

What is armature reaction Quora?

Armature reaction is effect of armature flux on main field flux. Basically there are two windings in a dc motor – Armature winding (on rotor) and field winding (on stator). When we excite the field winding, it produces a flux which links with the armature. This causes an emf and hence a current in the armature.

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.

What is armature and field?

The armature is the winding to which the load is connected. In small generators, the field windings are often on the stator, and the armature windings are on the rotor. A synchronous motor is virtually identical to a synchronous generator. Thus, the armature is the stator and the field is the rotor.

What is the armature reaction in a generator?

The armature reaction flux is constant in magnitude and rotates at synchronous speed. The armature reaction is cross-magnetizing when the generator supplies a load at unity power factor. When the generator supplies a load, at lagging power, the armature reaction is partly demagnetizing and partly cross-magnetizing.

What is the direction of armature reaction flux in alternator?

The direction of the armature reaction flux is opposite to the main field flux. Therefore, it will oppose and weaken the main field flux. It is said to be demagnetized. If the alternator is loaded with a load of zero power factor leading. The phase currents I A, I B, and I C will be leading their respective phase voltages E A, E B, and E C by 90⁰.

What are the conditions for armature reaction in synchronous machines?

The armature reaction in a synchronous machine affects the main field flux and varies differently for different power factors. Here armature reaction is discussed for the following three conditions, namely unity power factor, zero power factor lagging, and zero power factor leading.

What happens when an armature is used as an electric motor?

When the armature is used as an electric motor, due to relative motion between flux produced by the field winding and the flux produced by the armature winding the EMF is induced. This EMF will oppose the current of an armature and the torque produced in the rotor. And hence, the electrical power is converted into mechanical power.