DC Generator

From Wikiversity

An electrical Generator is a machine which converts mechanical energy (or power) into electrical energy (or power).

Principle :

It is based on the principle of production of dynamically (or motionally) induced e.m.f (Electromotive Force). Whenever a conductor cuts magnetic flux, dynamically induced e.m.f. is produced in it according to Faraday's Laws of Electromagnetic Induction. This e.m.f. causes a current to flow if the conductor circuit is closed.

Hence, the basic essential parts of an electric generator are :

A magnetic field and

A conductor or conductors which can so move as to cut the flux.

So as you can see there lies a simple generator with a field,coil and relative motion between them. So from faraday's laws of E.M.I we can say that the coil(loop) would house an E.M.F.

Depending upon field tyepe DC generators are classified. These are mainly 2 types 1) separately excited generators 2) self excited generators

In separately excited generators field is excited from a separate voltage source. Whereas in self excited type field is excited with permanent magnets.

Depending on field connection with armature they are further classified as 3 types i) series generators ii)shunt generators iii)compound generators