Construction of

DC machines DC machines By,

Rohini Haridas

Assistant Professor,

Dept of Electrical Engineering,

SSGM College of Engineering,Shegaon

Is DC generator and motor have

same construction???same construction???

Main construction diagram

Main parts

The two major parts required for construction :

1. Stator

That houses the field winding

1. Rotor

Rotating part that rotates in magnetic field

Other parts� Yoke

� Poles

� Field winding� Field winding

� Armature winding

� Commutator

� Brushes

Yoke � Its main function is to

form a protective

covering over the inner

sophisticated parts of

the motor and carriesthe motor and carries

the flux produced by

the poles.

� Made up of cast iron or

steel.

Poles

� The magnetic poles are

structures fitted onto the inner

wall of the yoke with screws.

� The construction of magnetic� The construction of magnetic

poles basically comprises of

two parts namely, the pole

core and the pole shoe

stacked together under

hydraulic pressure and then

attached to the yoke.

Field winding

� Made with field coils

(copper wire) wound

over the slots of the

pole shoes

� The field windings

basically form an

electromagnet, that

produces field flux

Armature

� The armature core are

provided with slots to

which the armature

windings made with

several turns of copperseveral turns of copper

wire distributed

uniformly over the

entire periphery of the

core.

Commutator

� It is a cylindrical structuremade up of copper segmentsstacked together, butinsulated from each other bymica.

� Collects the current from thearmature conductors

� Converts alternating currentinduced in the armaturecircuit into unidirectionalcurrent.

Brushes

� Made with carbon or

graphite structures,

making sliding contact

over the rotating

commutator.commutator.

� Collects the current

from commutator and

make it available to the

stationary ckt.