DC. Machine , Basic Structure of DC. Machines , Armature and Field winding

                   DC Machine 

A machine which either change electrical energy into mechanical energy or change mechanical energy into electrical energy is known as electrical machine .                                                      An electrical machine which works on DC current is known as DC machine .

Basic structure of electric machines

A rotating electric machine has two main parts :-
 1- Stator

2- Rotor

1- Stator :- The stator of the machine does not move and normally is the outer frame of the machine . In other words , stator is the stationery part of the  machine . 

2- Rotor :-  The rotor is free to move and normally is the inner part of the machine .

Both stator and rotor are made of ferromagnetic materials . there are two types of windings in electrical machine one is armature winding and other is field winding .

                    The winding in which voltage is induced is called the armature winding.                                                   
The winding through which a current is passed to produce the main flux is called  the field winding.  The permanent magnets are used in some machines to provide the main flux of the machine .                                                 
          There are two types of DC machine , the DC generator and the DC motor . The DC generator converts mechanical energy into electrical energy and based on the principal that when a conduction is rotated in a DC magnetic field , a voltage will be generated in the conductor , while on the other hand , the DC motor converts electrical energy into mechanical energy .