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PRESENTATION ON
THREE PHASE INDUCTION
MOTOR
• PRESENTED BY:
• MITESH KUMAR
• 13/EIE/26
• B.TECH(5TH SEM)
• 10300513026
• Appliied Electronics &
instrumentation Engineering
Haldia Institute Of Technology
INDUCTION MOTOR
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
CONSTRUCTION
• An induction motor has two main parts
– a stationary stator
– a revolving rotor
• Two basic design types depending on the rotor design
– squirrel-cage: conducting bars laid into slots and shorted at both ends
by shorting rings.
– wound-rotor: complete set of three-phase windings exactly as the
stator. Usually Y-connected, the ends of the three rotor wires are
connected to 3 slip rings on the rotor shaft. In this way, the rotor
circuit is accessible
Squirrel cage rotor
Wound rotor
PRINCIPLE OF OPERATION
• 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
ROTATING MAGNETIC FIELD
• Balanced three phase windings, i.e. mechanically
displaced 120 degrees form each other, fed by
balanced three phase source
• A rotating magnetic field with constant magnitude is
produced, rotating with a speed
Where fe is the supply frequency and
P is the no. of poles and nsync is called the synchronous
speed in rpm (revolutions per minute)
120 e
sync
f
n rpm
P

SYNCHRONOUS
P 50 Hz 60 Hz
2 3000 3600
4 1500 1800
6 1000 1200
8 750 900
10 600 720
12 500 600
ROTATING MAGNETIC FIELD
ROTATING MAGNETIC FIELD
APPLICATION OF INDUCTION MOTOR
• Squirrel cage induction motor
• Squirrel cage induction motors are simple and
rugged in construction, are relatively cheap and
require little maintenance. Hence, squirrel cage
induction motors are preferred in most of the
industrial applications such as in
• Lathes
• Drilling machines
• Agricultural and industrial pumps
• Industrial drives.
CONT....
• Slip ring induction motors
• Slip ring induction motors when compared to
squirrel cage motors have high starting torque,
smooth acceleration under heavy loads,
adjustable speed and good running
characteristics.
• They are used in
• Lifts
• Cranes
• Conveyors , etc.,
THANK
YOU

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Three phase induction motor By Mitesh Kumar

  • 1. PRESENTATION ON THREE PHASE INDUCTION MOTOR • PRESENTED BY: • MITESH KUMAR • 13/EIE/26 • B.TECH(5TH SEM) • 10300513026 • Appliied Electronics & instrumentation Engineering Haldia Institute Of Technology
  • 3. 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
  • 4. CONSTRUCTION • An induction motor has two main parts – a stationary stator – a revolving rotor • Two basic design types depending on the rotor design – squirrel-cage: conducting bars laid into slots and shorted at both ends by shorting rings. – wound-rotor: complete set of three-phase windings exactly as the stator. Usually Y-connected, the ends of the three rotor wires are connected to 3 slip rings on the rotor shaft. In this way, the rotor circuit is accessible
  • 6. PRINCIPLE OF OPERATION • 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
  • 7. ROTATING MAGNETIC FIELD • Balanced three phase windings, i.e. mechanically displaced 120 degrees form each other, fed by balanced three phase source • A rotating magnetic field with constant magnitude is produced, rotating with a speed Where fe is the supply frequency and P is the no. of poles and nsync is called the synchronous speed in rpm (revolutions per minute) 120 e sync f n rpm P 
  • 8. SYNCHRONOUS P 50 Hz 60 Hz 2 3000 3600 4 1500 1800 6 1000 1200 8 750 900 10 600 720 12 500 600
  • 11. APPLICATION OF INDUCTION MOTOR • Squirrel cage induction motor • Squirrel cage induction motors are simple and rugged in construction, are relatively cheap and require little maintenance. Hence, squirrel cage induction motors are preferred in most of the industrial applications such as in • Lathes • Drilling machines • Agricultural and industrial pumps • Industrial drives.
  • 12. CONT.... • Slip ring induction motors • Slip ring induction motors when compared to squirrel cage motors have high starting torque, smooth acceleration under heavy loads, adjustable speed and good running characteristics. • They are used in • Lifts • Cranes • Conveyors , etc.,