The document describes the main construction of DC machines. It lists the two major parts as the stator, which houses the field winding, and the rotor, which rotates in the magnetic field. It then describes the other key parts which include the yoke, poles, field winding, armature winding, commutator, and brushes. The yoke forms a protective covering and carries magnetic flux. The poles contain core and shoe components that produce magnetic flux. The field and armature windings use copper wire to generate electromagnetism. The commutator collects alternating current from the armature and converts it to direct current, while the brushes collect this current.

1. Construction of
DC machines
By,
Rohini Haridas
Assistant Professor,
Dept of Electrical Engineering,
SSGM College of Engineering,Shegaon

2. Is DC generator and motor have
same construction???

3. Main construction diagram

4. 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

6. Other parts
Yoke
Poles
Field winding
Armature winding
Commutator
Brushes

7. Yoke
Its main function is to
form
a
protective
covering over the inner
sophisticated parts of
the motor and carries
the flux produced by
the poles.
Made up of cast iron or
steel.

8. Poles
The magnetic poles are
structures fitted onto the inner
wall of the yoke with screws.
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.

9. 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

10. Armature
The armature core are
provided with slots to
which the armature
windings made with
several turns of copper
wire
distributed
uniformly over the
entire periphery of the
core.

11. Commutator
It is a cylindrical structure
made up of copper segments
stacked
together,
but
insulated from each other by
mica.
Collects the current from the
armature conductors
Converts alternating current
induced in the armature
circuit into unidirectional
current.

12. Brushes
Made with carbon or
graphite
structures,
making sliding contact
over
the
rotating
commutator.
Collects the current
from commutator and
make it available to the
stationary ckt.