Induction motor construction

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  • 1. To download visit ayyarao.blogspot.com Feb 28, 2012 INDUCTION MOTOR
  • 2. AC Machines
    • Three-Phase Induction Motors.
    • Synchronous Machines.
    • Single-Phase Motors.
    • Stepper and Brushless DC Motors.
    Feb 28, 2012
  • 3. INDUCTION MOTOR Feb 28, 2012
    • ADVANTAGES :
    • 3-phase induction motors are simple & rugged.
    • Its cost is low & it is reliable
    • Its has high efficiency.
    • Its maintenance cost is low
    • Its is self starting motor
    • Suitable for all environments like coal mines & chemical factories
  • 4. Construction Feb 28, 2012
  • 5. Construction Feb 28, 2012
  • 6. Construction
    • A 3-phase induction motor has two main parts
    • Stator
    • Rotor
    • Stator
    • The stator of an induction motor
    • consists of Stator Frame,
    • Stator core, 3 phase winding,
    • two end covers, bearings etc.
    Feb 28, 2012
  • 7. Construction
    • Stator core is a stack of cylindrical steel laminations.
    • Slots are provided on the inner periphery.
    • Three windings are space displaced by 120 0 electrical.
    • Large size motors use open slots.
    • Small size motors use semi closed slots.
    • The air gap length should be as small as possible
    Feb 28, 2012
  • 8. Construction
    • Stator frame provides only mechanical support to the stator core.
    • The stator winding for a definite number of poles .
    • Greater the poles, lesser the speed and vice versa.
    • Rotor
    • Squirrel-cage rotor
    • Phase-wound rotor
    Feb 28, 2012
  • 9. Construction
    • Squirrel-Cage Rotor
    Feb 28, 2012
  • 10. Construction
    • Squirrel-cage rotor
    • The rotor winding is in form of copper bars.
    • The copper bars are revited, welded with end rings.
    • No external resistance can be inserted in the rotor circuit.
    Feb 28, 2012
  • 11. Construction
    • Wound rotor
    • The rotor winding is uniformly distributed..
    • Three leads are connected to the slip rings.
    • Carbon brushes are pressed on the slip rings.
    Feb 28, 2012
  • 12. Construction Feb 28, 2012
  • 13. Construction
    • Phase-wound Rotor
    Feb 28, 2012
  • 14. Construction Feb 28, 2012
  • 15. INDUCTION MOTOR Feb 28, 2012