What is excitation in generator and 2 methods each?

when the current is passing through the winding then it is called "Excitation".

Types of excitation

(1)seperately excited generator.

(2)self excited generator.

self generator is classified into 3 types.

1.shunt generator.

2.series generator.

3.compound generator.

compoud generator is again classified into 2 types.

1.short shunt generator.

2.long shunt generator.