Stationary Armature

Advantages of Stationary Armature

The field twisting of an alternator is put on the rotor and is associated with d.c. supply through two slip rings. The 3-phase armature winding is set on the stator. The advantages of Stationary Armature are the Following.

1. It is easier to insulate stationary winding for high voltages for which the alternators are usually designed.

2. It is on the grounds that they are not exposed to diffusive powers and furthermore additional room is accessible because of the stationary course of action of the armature.

3. The stationary 3-phase armature can be directly connected to load without going through large, unreliable slip rings and brushes.

4. Only two slip rings are required for d.c. supply to the field winding on the rotor. Since the exciting current is small, the slip rings and brush gear required are of light construction. Due to the simple and robust construction of the rotor, the higher speed of rotating d.c. the field is possible. This expands the yield reachable from a machine of given measurements.

Note - All alternators over 5 kVA utilize a stationary armature (or stator) and a rotating d.c. field.