A DC machine is an electro-mechanical device that converts mechanical energy into electrical energy. It works on Faraday's law of induction, which states that an electromotive force is induced in a conductor whenever it cuts magnetic lines of force. The DC machine consists of a stator, rotor, commutators, and brushes. The stator is the stationary part with field windings, while the rotor rotates inside the stator. Commutators and brushes are used to convert the alternating current generated in the rotor into direct current. DC machines have applications in motors, generators, and other devices that require conversion between mechanical and electrical energy.

1. DC MACHINE
PRESENTED BY
SHIRISHA REDDYMALLA

2. OVER VIEW
DIFINATION
PRINCIPLE
CONSTRUCTION
APPLICATIONS

3. DIFINATION
It is an electro-mechanical energy conversion device which
converts mechanical energy into useful DC electrical energy.

4. PRINCIPLE
It works on principle of Faraday’s law.
Faraday’s law: whenever a conductor cuts the machine field
an emf will be induce in the conductor.

5. DC MACHINE
It is consider
as a 4-pole
DC machine

6. CONSTRUCTION
STATOR
ROTOR
COMMUTATORS
BRUSHES

7. STATOR
It is a stationary part in the machine which consists of Yoke, pole core,
pole shoe, field winding.
It is made up of cast iron / mild steel.
Yoke : It is the outer frame of the machine which provides mechanical
support to the whole machine.
Pole core: It provides low reluctance path per magnetic flux.
Pole shoe: It provides mechanical support to the field winding.
Field winding: It is made up of copper and it is excited by DC supply.

8. ROTOR
Rotor: it is rotating part in the machine which consists of
armacher pole and armacher winding.
Armacher pole: It is made up of silicon steel.
Armacher winding: It is made up of copper.

9. COMMUTATORS
It is act as a mechanical rectifier which converts AC to DC
and vice-versa.
It is made up of hard drawn copper.

10. BRUSHES
These are the current collectors.
It is made up of carbon / graphite material.

11. WORKING
Whenever rotating armacher conductors(rotor) cuts the
stationary magnetic flux (stator), an EMF will be induced in
the armacher conductor
The direction of an induced EMF can be founded by
Fleming’s right Hand.
Right Hand Rule: The four finger indicates the direction of
flux thumb finger indicates direction of motion of conductor
middle finger indicates direction of induced EMF of the
current.

12. PRESENTED BY
SHIRISHA REDDYMALLA
B.TECH 1YEAR ECE
KAKATIYA UNIVERSITY
WARANGAL
Smart Work For Great Success………,