DIRECT CURRENT MACHINES
ABSTRACT:
D.C.machine is a highly versatile energy conversion device.It can meet the demand of loads requiring high starting torques, high accelerating and decelerating torques d.c.machine is easily adaptablefor drives requiring wide-range speed controls and quick circuits.In d.c machines, the field poles are on the stator called yoke .Armature windings and commutator are on the rotor .brushes are pressed on the commutator surface to collect current from commutator These machines are classified into two categories i.e . Generators and motor Generators are mainly used to convert mechanical energy into electrical energy. Motors are used to convert electrical energy. to mechanica
Generators are classified into many types depending upon their excitations they are self & separately exited .Again these self exited generators are of three types
1) Series generators
2) Shunt generators
3) Compound generators
There are some losses in generators some of them are listed below
There are some losses in generators some of them are listed below
1) Frictional losses
2) Iron losses
3) Field winding losses
Now-a-days these d.c.machines are applied in many aspects.
