Question

In a armature, the wedges are made of

Answer 1

Slot wedges are used to reduce the air gap flux to reduce armature reaction.

So, it is made up of silicon steel.

To achieve stronger magnetic field created by the field poles, the air gap between the yoke and armature is kept small in rotating machines.

An armature is usually rotating part of an electric machine (such as a generator or motor) which consists essentially of coils of wire around a metal core and in which electric current is induced or in which the input current interacts with a magnetic field to produce torque.