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Three Phase Induction Motor
?
Outlines:
      -  Introduction
      -  Basic Principle
      -  Types of 3-Ph Induction Motor
      -  Construction of an I.M.
      -  Squirrel cage I.M.
      -  Slip Ring I.M.
      -  Winding of an I.M.                                                 
                    -  Assembly of 3-ph I.M.                       
                                -  Rotating Magnetic Field of  
I.M.                             -  I.M. Speed                      
                                   -  I.M. and Transformer          
                                             -  Power losses in 
Induction Motor
Page 2


Three Phase Induction Motor
?
Outlines:
      -  Introduction
      -  Basic Principle
      -  Types of 3-Ph Induction Motor
      -  Construction of an I.M.
      -  Squirrel cage I.M.
      -  Slip Ring I.M.
      -  Winding of an I.M.                                                 
                    -  Assembly of 3-ph I.M.                       
                                -  Rotating Magnetic Field of  
I.M.                             -  I.M. Speed                      
                                   -  I.M. and Transformer          
                                             -  Power losses in 
Induction Motor
Induction Motors
Page 3


Three Phase Induction Motor
?
Outlines:
      -  Introduction
      -  Basic Principle
      -  Types of 3-Ph Induction Motor
      -  Construction of an I.M.
      -  Squirrel cage I.M.
      -  Slip Ring I.M.
      -  Winding of an I.M.                                                 
                    -  Assembly of 3-ph I.M.                       
                                -  Rotating Magnetic Field of  
I.M.                             -  I.M. Speed                      
                                   -  I.M. and Transformer          
                                             -  Power losses in 
Induction Motor
Induction Motors Introduction
?
Three-phase induction motors are the most 
common and frequently encountered machines in 
industry
-
simple design, rugged, low-price, easy maintenance
-
wide range of power ratings: fractional horsepower to 
10 MW 
-
run essentially as constant speed from no-load to full 
load
-
Its speed depends on the frequency of the power source
•
not easy to have variable speed control 
•
requires a variable-frequency power-electronic drive for 
optimal speed control
Page 4


Three Phase Induction Motor
?
Outlines:
      -  Introduction
      -  Basic Principle
      -  Types of 3-Ph Induction Motor
      -  Construction of an I.M.
      -  Squirrel cage I.M.
      -  Slip Ring I.M.
      -  Winding of an I.M.                                                 
                    -  Assembly of 3-ph I.M.                       
                                -  Rotating Magnetic Field of  
I.M.                             -  I.M. Speed                      
                                   -  I.M. and Transformer          
                                             -  Power losses in 
Induction Motor
Induction Motors Introduction
?
Three-phase induction motors are the most 
common and frequently encountered machines in 
industry
-
simple design, rugged, low-price, easy maintenance
-
wide range of power ratings: fractional horsepower to 
10 MW 
-
run essentially as constant speed from no-load to full 
load
-
Its speed depends on the frequency of the power source
•
not easy to have variable speed control 
•
requires a variable-frequency power-electronic drive for 
optimal speed control
Principle of Operation I.M
?
This rotating magnetic field cuts the rotor windings and 
produces an induced voltage in the rotor windings
?
Due to the fact that the rotor windings are short circuited, for 
both squirrel cage and wound-rotor, and induced current 
flows in the rotor windings
?
The rotor current produces another magnetic field
?
A torque is produced as a result of the interaction of those 
two magnetic fields
Where t
ind
 is the induced torque and B
R
 and B
S
 are the magnetic 
flux densities of the rotor and the stator respectively
ind R s
kB B t = ×
Page 5


Three Phase Induction Motor
?
Outlines:
      -  Introduction
      -  Basic Principle
      -  Types of 3-Ph Induction Motor
      -  Construction of an I.M.
      -  Squirrel cage I.M.
      -  Slip Ring I.M.
      -  Winding of an I.M.                                                 
                    -  Assembly of 3-ph I.M.                       
                                -  Rotating Magnetic Field of  
I.M.                             -  I.M. Speed                      
                                   -  I.M. and Transformer          
                                             -  Power losses in 
Induction Motor
Induction Motors Introduction
?
Three-phase induction motors are the most 
common and frequently encountered machines in 
industry
-
simple design, rugged, low-price, easy maintenance
-
wide range of power ratings: fractional horsepower to 
10 MW 
-
run essentially as constant speed from no-load to full 
load
-
Its speed depends on the frequency of the power source
•
not easy to have variable speed control 
•
requires a variable-frequency power-electronic drive for 
optimal speed control
Principle of Operation I.M
?
This rotating magnetic field cuts the rotor windings and 
produces an induced voltage in the rotor windings
?
Due to the fact that the rotor windings are short circuited, for 
both squirrel cage and wound-rotor, and induced current 
flows in the rotor windings
?
The rotor current produces another magnetic field
?
A torque is produced as a result of the interaction of those 
two magnetic fields
Where t
ind
 is the induced torque and B
R
 and B
S
 are the magnetic 
flux densities of the rotor and the stator respectively
ind R s
kB B t = ×
TYPES OF INDUCTION MOTER
?
Based on type of phase supply                       
                                                                    
                                                                    
                                                               
     
     - Three phase induction motor (self 
starting  in nature)                                 
                                - Squirrel cage I.M.        
                                        - Slip ring I.M.     
                                                                               
                    -  Single phase induction motor 
(not self starting) 
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FAQs on PPT: Three-Phase Induction Motor - Basic Electrical Technology - Electrical Engineering (EE)

1. What is a three-phase induction motor?
Ans. A three-phase induction motor is a type of AC motor that operates on the principle of electromagnetic induction. It consists of a stator with three windings and a rotor that rotates due to the rotating magnetic field created by the stator windings.
2. How does a three-phase induction motor work?
Ans. A three-phase induction motor works by creating a rotating magnetic field in the stator windings. This rotating magnetic field induces currents in the rotor, which in turn creates a magnetic field. The interaction between the stator and rotor magnetic fields generates torque, causing the rotor to rotate.
3. What are the advantages of using a three-phase induction motor?
Ans. Some advantages of using a three-phase induction motor include high efficiency, low maintenance, high starting torque, and the ability to operate in a wide range of industrial applications. Additionally, they are relatively inexpensive and have a long operational life.
4. How can the speed of a three-phase induction motor be controlled?
Ans. The speed of a three-phase induction motor can be controlled using methods such as changing the number of poles, using variable frequency drives (VFDs), or employing additional external devices like resistors or capacitors. These control methods allow for precise speed regulation according to the requirements of the application.
5. What are the common applications of three-phase induction motors?
Ans. Three-phase induction motors are widely used in various industrial applications, including pumps, compressors, fans, conveyors, crushers, and machine tools. They are also commonly found in household appliances like washing machines, refrigerators, and air conditioners due to their reliability and efficiency.
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