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Electric 
Machine 
From:- Ashok Soni 
BE (Electrical & Electronics) 
GGCT Jabalpur
Classification of electrical machines 
Electrical 
machines 
Static 
Machine 
Rotating 
Machines 
Transformer
Classification of electrical machines 
Electrical 
machines 
DC 
Machines 
AC 
Machines 
DC 
Generator 
DC 
Motor 
Asynchronous 
Machine 
Synchronous 
Machine 
Synchronous 
Generator 
Synchronous 
Motor 
Induction 
Machines 
1 phase 3 phase 1 phase 3 phase 1 phase 3 phase
DC Machines 
Basically Dcmachine divided in two parts:- 
1. DC Generator 
2. DC Motor 
There are two types of generators, one is 
AC generator and other is DC generator. 
Whatever may be the types of generators, it 
always converts mechanical power to 
electrical power
DC Machines 
There are two types of motor, one is AC 
motor and other is DC motor. It is an electro-mechanical 
device that converts electrical 
energy to mechanical energy. 
Generators is based on the fundamental 
principle of Faraday’s laws of 
Electromagnetic Induction.
DC Generator 
Generators is based on the fundamental 
principle of Faraday’s laws of 
Electromagnetic Induction. 
According to these law, when an 
conductor moves in a magnetic field it cuts 
magnetic lines force, due to which an emf is 
induced in the conductor. The magnitude of 
this induced emf depends upon the rate of 
change of flux (magnetic line force) linkage 
with the conductor.
DC Generator 
Hence the most basic tow essential parts 
of a generator are 
1. A magnetic field and 
2. Conductors which move inside that 
magnetic field. 
Here N & S pole produce a magnetic flux & 
ABCD is a show conductor.
DC Generator
DC Generator
DC Generator 
The nature of induced EMF in the DC 
Generator is always a AC (alternating) nature. 
With the help of commutator this induced AC 
(alternating) nature emf is converted in to a 
DC nature.
DC Generator 
The direction of induced current in the 
conductor in DC generator is determined by 
Fleming Right Hand rule.
DC Generator
DC Motor 
This DC or direct current 
motor works on the principal, when a current 
carrying conductor is placed in a magnetic 
field, it experiences a torque and has a 
tendency to move. This is known as motoring 
action. If the direction of electric current in 
the wire is reversed, the direction of rotation 
also reverses.
DC Motor
DC Motor 
When magnetic field and electric field 
interact they produce a mechanical force, and 
based on that the working principle of dc 
motor established. The direction of rotation 
of a this motor is given by Fleming’s left hand 
rule,
DC Motor 
The force which is experienced by DC 
machine is determined by:- 
F = BIL 
where, 
B = Flux Density 
I = Current flowing in conductor 
L = Length of conductor 
Construction wise a DC motor is exactly 
similar to a DC generator, but electrically it is 
just the opposite.

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Electric machine

  • 1. Electric Machine From:- Ashok Soni BE (Electrical & Electronics) GGCT Jabalpur
  • 2. Classification of electrical machines Electrical machines Static Machine Rotating Machines Transformer
  • 3. Classification of electrical machines Electrical machines DC Machines AC Machines DC Generator DC Motor Asynchronous Machine Synchronous Machine Synchronous Generator Synchronous Motor Induction Machines 1 phase 3 phase 1 phase 3 phase 1 phase 3 phase
  • 4. DC Machines Basically Dcmachine divided in two parts:- 1. DC Generator 2. DC Motor There are two types of generators, one is AC generator and other is DC generator. Whatever may be the types of generators, it always converts mechanical power to electrical power
  • 5. DC Machines There are two types of motor, one is AC motor and other is DC motor. It is an electro-mechanical device that converts electrical energy to mechanical energy. Generators is based on the fundamental principle of Faraday’s laws of Electromagnetic Induction.
  • 6. DC Generator Generators is based on the fundamental principle of Faraday’s laws of Electromagnetic Induction. According to these law, when an conductor moves in a magnetic field it cuts magnetic lines force, due to which an emf is induced in the conductor. The magnitude of this induced emf depends upon the rate of change of flux (magnetic line force) linkage with the conductor.
  • 7. DC Generator Hence the most basic tow essential parts of a generator are 1. A magnetic field and 2. Conductors which move inside that magnetic field. Here N & S pole produce a magnetic flux & ABCD is a show conductor.
  • 10. DC Generator The nature of induced EMF in the DC Generator is always a AC (alternating) nature. With the help of commutator this induced AC (alternating) nature emf is converted in to a DC nature.
  • 11. DC Generator The direction of induced current in the conductor in DC generator is determined by Fleming Right Hand rule.
  • 13. DC Motor This DC or direct current motor works on the principal, when a current carrying conductor is placed in a magnetic field, it experiences a torque and has a tendency to move. This is known as motoring action. If the direction of electric current in the wire is reversed, the direction of rotation also reverses.
  • 15. DC Motor When magnetic field and electric field interact they produce a mechanical force, and based on that the working principle of dc motor established. The direction of rotation of a this motor is given by Fleming’s left hand rule,
  • 16. DC Motor The force which is experienced by DC machine is determined by:- F = BIL where, B = Flux Density I = Current flowing in conductor L = Length of conductor Construction wise a DC motor is exactly similar to a DC generator, but electrically it is just the opposite.