Download - Construction of dc machines
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.