WHAT ARE THE FUNCTION OF YOKE? DEFINE THE FUNCTION AND HOW TO CHOOSE THE MATERIAL FOR YOKE?

So first of all I would like to share some thing (basic) about Yoke, What is Yoke? How to choose material? OKay!!
Yoke is the body part of any motor whether it is dc motor or AC motor. Both have yoke, Yoke is the structure and body of motor.

The Functions of Yoke are:

1. It provide mechanically support to the poles.
2. It serves the purpose of outer most cover of the motor.
3. It provide a path of low reluctance for flux.
4. It forms a part of the magnetic circuits.

And in the last, It is prepared by Cost Iron, For large machines, we used rolled steel, silicon steel which provides high permeability.