The document discusses the construction of a DC motor. It describes the various parts of a DC motor including the yoke, eye bolt, field pole, armature core, armature winding, commutator, and brushes. The yoke carries magnetic flux between the poles and protects other parts. The field pole houses the field winding to generate a magnetic field when energized. The armature core has slots for the armature winding and develops torque. The commutator and brushes provide power to the armature winding to cause rotation.

1. Presented by;
Mr. POKHARKAR S.V.,
DATTAKALA POLYTECHNIC SWAMI-CHINCHOLI
LECTURER IN ELECTRICAL ENGINEERING DEPARTMENT
CONSTRUCTION OF DC MOTOR
1
CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC SWAMI-
CHINCHOLI

2. INTRODUCTION
Introductory Stage- Learning Objectives-
 Daily use of motor in
daily life. Eg.- Mixer,
Fans, pump etc
 History-
1)Basic Concept
2)Fleming’s Left Hand
Rule
3)Working Principle
 After this session student
will able to…………
1)List the various parts of
DC motor.
2)Draw Schematic
diagram of DC motor.
3)Describe function of
various parts of DC motor.
4)Explain the construction
of DC motor.
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC SWAMI-
CHINCHOLI

3. YOKE
 MATERIAL:- It is made
of galvanised iron(G.I.)
with rolled heat treatment.
 FUNCTION:-
1)It carries magnetic flux
from one pole to another
pole.
2)It acts as protective
cover to other parts.Viz-
field pole, field
winding, armature core
etc.
3)It provides space for
field pole housing by
rivetting.
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC
SWAMI-CHINCHOLI

4. EYE BOLT
 MATERIAL:- It is
made of hot rolled grain
oriented(HRGO) mild
steel (M.S.).
 FUNCTION:-
1)It helps for shifting of
machine from one place
to other place OR for
level change.
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC
SWAMI-CHINCHOLI

5. FIELD POLE &
POLE SHOE
 FIELD
POLE:- MATERIAL:- It
is made up of thin laminations of
Silicon Steel(S.S.)
FUNCTION:-
1)It provides space for
housing of field winding.
2)It develop magnetic field when
current flows through field
windings.
 POLE
SHOE:- MATERIAL:- It is
made up of thin laminations of
Silicon Steel(S.S.)
FUNCTION:-
It provides maximum area
for injection of magnetic flux over
armature.
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC
SWAMI-CHINCHOLI

6. FIELD WINDING
 MATERIAL:- It is
made up of copper(cu)
wire with suitable
gauge.
 FUNCTION:- When
current flows through it
excited field pole for
developing magnetic
field.
6
CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC SWAMI-
CHINCHOLI

7. ARMATURE CORE & ARMATURE
WINDING
 ARMATURE CORE:-
MATERIAL:-It is made up of
very thin laminations of silicon
steel.(S.S.)
FUNCTION:-1)It provides slots
for housing of armature
winding.2)It cut’s the magnetic
field developed by field circuit.
 ARMATURE WINDING:-
MATERIAL:-It is made up of
copper(cu) with suitable gauge.
FUNCTION:-It develop EMF for
producing necessary torque due
to which armature starts
rotating.
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC SWAMI-
CHINCHOLI

8. COMMUTATOR
 MATERIAL:- It
is made up of hard
drawn copper(CU-
99.7% & C-0.3%).
 FUNCTION:-
For excitation of
armature winding
current is giving from it.
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC
SWAMI-CHINCHOLI

9. BRUSHES
 MATERIAL:- It
is made up carbon or
graphite.
 FUNCTION:- D
C supply is giving to
brushes via commutator
it reaches towards
armature winding.
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC SWAMI-
CHINCHOLI

10. CUT SECTION OF DC MOTOR
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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC
SWAMI-CHINCHOLI

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CONSTRUCTION OF DC MOTOR
BY MR.POKHARKAR S.V.
DATTAKALA POLYTECHNIC SWAMI-
CHINCHOLI