INDUCTION MOTOR1
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INDUCTION MOTOR1

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    INDUCTION MOTOR1 INDUCTION MOTOR1 Presentation Transcript

    • INDUCTION MOTOR Unit-V 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • AC Machines
        • Three-Phase Induction Motors.
        • Synchronous Machines.
        • Single-Phase Motors.
        • Stepper and Brushless DC Motors.
      8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • INDUCTION MOTOR 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
      • 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
    • Construction 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • Construction 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • Construction
      • A 3-phase induction motor has two main parts
        • Stator
        • Rotor
      • Stator
      • The stator core is a stack of
      • cylindrical steel laminations.
      • Slots are punched to receive
      • the winding.
      • The stator carries 3phase
      • Winding.
      8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • Construction
        • 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
      8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • Construction
      • 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
      8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • Construction Squirrel-Cage Rotor 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • 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.
      8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • 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.
      8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • Construction Phase-wound Rotor 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
    • Construction 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY