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INDUCTION MOTOR Unit-V 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
AC Machines <ul><ul><li>Three-Phase Induction Motors.  </li></ul></ul><ul><ul><li>Synchronous Machines.  </li></ul></ul><u...
INDUCTION MOTOR 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY <ul><li>ADVANTAGES : </li></ul><ul><ul><li>3-phase in...
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 <ul><li>A 3-phase induction motor has two main parts </li></ul><ul><ul><li>Stator </li></ul></ul><ul><ul><li>...
Construction <ul><ul><li>Three windings are space displaced by 120 0  electrical. </li></ul></ul><ul><ul><li>Large size mo...
Construction <ul><li>The stator winding for a definite number of poles . </li></ul><ul><li>Greater the poles, lesser the s...
Construction Squirrel-Cage Rotor 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
Construction <ul><li>Squirrel-cage rotor </li></ul><ul><ul><li>The rotor winding is in form of copper bars. </li></ul></ul...
Construction <ul><li>Wound rotor </li></ul><ul><ul><li>The rotor winding is uniformly distributed.. </li></ul></ul><ul><ul...
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
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INDUCTION MOTOR1

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Transcript of "INDUCTION MOTOR1"

  1. 1. INDUCTION MOTOR Unit-V 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  2. 2. AC Machines <ul><ul><li>Three-Phase Induction Motors. </li></ul></ul><ul><ul><li>Synchronous Machines. </li></ul></ul><ul><ul><li>Single-Phase Motors. </li></ul></ul><ul><ul><li>Stepper and Brushless DC Motors. </li></ul></ul>8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  3. 3. INDUCTION MOTOR 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY <ul><li>ADVANTAGES : </li></ul><ul><ul><li>3-phase induction motors are simple & rugged. </li></ul></ul><ul><ul><li>Its cost is low & it is reliable </li></ul></ul><ul><ul><li>Its has high efficiency. </li></ul></ul><ul><ul><li>Its maintenance cost is low </li></ul></ul><ul><ul><li>Its is self starting motor </li></ul></ul><ul><ul><li>Suitable for all environments like coal mines & chemical factories </li></ul></ul>
  4. 4. Construction 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  5. 5. Construction 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  6. 6. Construction <ul><li>A 3-phase induction motor has two main parts </li></ul><ul><ul><li>Stator </li></ul></ul><ul><ul><li>Rotor </li></ul></ul><ul><li>Stator </li></ul><ul><li>The stator core is a stack of </li></ul><ul><li>cylindrical steel laminations. </li></ul><ul><li>Slots are punched to receive </li></ul><ul><li>the winding. </li></ul><ul><li>The stator carries 3phase </li></ul><ul><li>Winding. </li></ul>8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  7. 7. Construction <ul><ul><li>Three windings are space displaced by 120 0 electrical. </li></ul></ul><ul><ul><li>Large size motors use open slots. </li></ul></ul><ul><ul><li>Small size motors use semi closed slots. </li></ul></ul><ul><ul><li>The air gap length should be as small as possible </li></ul></ul>8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  8. 8. Construction <ul><li>The stator winding for a definite number of poles . </li></ul><ul><li>Greater the poles, lesser the speed and vice versa. </li></ul><ul><li>Rotor </li></ul><ul><ul><li>Squirrel-cage rotor </li></ul></ul><ul><ul><li>Phase-wound rotor </li></ul></ul>8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  9. 9. Construction Squirrel-Cage Rotor 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  10. 10. Construction <ul><li>Squirrel-cage rotor </li></ul><ul><ul><li>The rotor winding is in form of copper bars. </li></ul></ul><ul><ul><li>The copper bars are revited, welded with end rings. </li></ul></ul><ul><ul><li>No external resistance can be inserted in the rotor circuit. </li></ul></ul>8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  11. 11. Construction <ul><li>Wound rotor </li></ul><ul><ul><li>The rotor winding is uniformly distributed.. </li></ul></ul><ul><ul><li>Three leads are connected to the slip rings. </li></ul></ul><ul><ul><li>Carbon brushes are pressed on the slip rings. </li></ul></ul>8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  12. 12. Construction Phase-wound Rotor 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
  13. 13. Construction 8-Dec-11 T.S.L.V.Ayyarao GMR INSTITUTE OF TECHNOLOGY
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