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The Magnetic Field of Synchronous Machines: Slides to Complement Class Notes

The Magnetic Field of Synchronous Machines: Slides to Complement Class Notes. by Constantine J. Hatziadoniu. Stator Carries a 3-phase ac winding, Rotor carries a dc winding. Machine with Salient Poles. The Rotor is supplied via slip rings.

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The Magnetic Field of Synchronous Machines: Slides to Complement Class Notes

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  1. The Magnetic Field of Synchronous Machines: Slides to Complement Class Notes by Constantine J. Hatziadoniu

  2. Stator Carries a 3-phase ac winding, Rotor carries a dc winding

  3. Machine with Salient Poles

  4. The Rotor is supplied via slip rings

  5. One phase with concentrated winding:Flux distribution is rectangular

  6. One-phase distributed winding: Flux space distribution is closer to sinusoidal

  7. Three phase stator: positive sequence currents

  8. Phase a is excited by a sinusoidal current: Air-gap field is a sinusoidal (space) distribution pulsating in time

  9. Phase a field is a two-pole magnet; The magnetic axis passes through the middle (axis) of the winding

  10. Phase b bi-polar field

  11. Phase c bi-polar field

  12. All three fields added in the air-gap: The resulting field is a rotating sinusoidal distribution

  13. The combined field (dashed line) moving around the air gap

  14. …Continued

  15. Instances of the rotating field: Field rotates ones around the air-gap within a complete electric period

  16. The winding arrangement of a four-pole machine

  17. Phase a of the 4-pole machine: The spatial distribution varies twice in a full cycle

  18. Phase b of the 4-pole machine

  19. Phase c of the 4-pole machine

  20. The three distributions shown for the 4-pole machine

  21. Combined field is a rotating distribution

  22. The 4-pole field rotates ½ times around in one electric period—the machine speed is reduced to half the speed of a 2-pole machine

  23. The Rotor Field of the 4-pole machine

  24. Rotor and Stator Fields rotate in step inside the airgap

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