Induction motor construction

17,921 views

Published on

Published in: Education, Business
2 Comments
16 Likes
Statistics
Notes
No Downloads
Views
Total views
17,921
On SlideShare
0
From Embeds
0
Number of Embeds
146
Actions
Shares
0
Downloads
823
Comments
2
Likes
16
Embeds 0
No embeds

No notes for slide

Induction motor construction

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

×