Presentation On Dc Motors

A DC Motor is a machine which converts electrical energy into mechanical energy. It depends for its operation on the force which is known to exist on conductor carrying a current while situated in a magnetic field.

1. PresentationPresentation
On On
Dc MotorsDc Motors
Presented ByPresented By
Anup Chandra HowladerAnup Chandra Howlader
Roll - 1244Roll - 1244
Course Code: MTE - 501Course Code: MTE - 501
Course Teacher: Firojz MahamudCourse Teacher: Firojz Mahamud
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2. HISTORY & INTRODUCTION OF THE DC MOTOR
CONSTRUCTION OF DC MOTOR
TYPES OF DC MOTOR
WORKING OF DC MOTOR
MERITS & DEMERITS OF DC MOTOR
INDEXINDEX
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3. Brief History of DC Motor
The history of DC Motor
can be traced back to
the 1830s,when Michael
Faraday did extensive
works on disc type of
machine
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4. INTRODUCTION OF DC
MOTOR
A DC Motor is a
machine which
converts electrical
energy into
mechanical energy.
It depends for its
operation on the
force which is
known to exist on
conductor carrying
a current while
situated in a
magnetic field.
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5. Construction of DC MOTOR
FIELD POLES- The pole shoe acts as a support to the field
coils and spread out the flux in the air gap and reduce
the reluctance of magnetic field.
FRAME- The Frame is the stationary part of a machine in
which poles, and rotor are stationed.
ARMATURE- The armature consist of core and winding. It is
built up of thin lamination of low loss silicon steel(0.4 to
0.5)
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6. COMMUTATOR- A commutator
converts alternating voltage to direct
voltage. It is a cylindrical structure built
up of segment made drawn copper.
BRUSHES- The use of brushes is made
for machines designed for large
current at low voltage.
ARMATURE WINDING- The winding must
be designated with the most
advantages utilization of the material
in respect to weight and efficiency
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7. TYPES OF DC MOTOR

SHUNT MOTOR – Shunt Motor
in which the field
winding is connected
in parallel with the
armature
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8. SERIES MOTOR-
Series Motor in
which the
armature and
field winding
are
connected in
series
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9. COMPOUND MOTOR- This type
of motor has two field winding,
one of which is c6nnected in
parallel with the armature and
other in series with it
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10. Working Principle Of DC MOTOR
Whenever a current
carrying conductor is
placed in a magnetic
field, it experienced a
force whose direction is
given by Fleming’s Left
Hand Rule.
It shows the field set up by
the poles
It shows the conductor
field due to flow of current
in the conductor
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11. MERITS
High starting torque
Speed control over a
wide range, both
below and above
normal speed
Accurate seedless
speed control
Quick starting,
stopping
DEMERITS
High initial cost
Increased operating
and maintenance
cost because of the
commutator and
brush gear
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12. Thank you
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