What is armature reaction? Explain briefly the cross magnetizing and de-magnetizing effect of a loaded generator
Armature reaction : The current flow in the armature conductors of a dynamo has an important and undesirable effect upon the dynamo’s operation. The current in the armature produces a flux and it is the interaction between this flux and the field flux that is called armature reaction. Cross magnetizing and demagnetizing effect : The effects of the armature flux my be analyzed by considering the flux to consists of two components that are at right angle to each other as shown in fig. One component is at right angle to the field, and because this component crosses the main –field flux, it is known as the cross –magnetizing component of the armature flux. The second component is in the same plane as the main field flux . The direction of this component is opposite to the direction of the main field flux, with the result the it tends to reduce the effect of the main field flux. This component of the armature flux , is known as demagnetizing component