the magnetic field of synchronous machines: slides to complement class notes by constantine j....
TRANSCRIPT
![Page 1: The Magnetic Field of Synchronous Machines: Slides to Complement Class Notes by Constantine J. Hatziadoniu](https://reader030.vdocuments.us/reader030/viewer/2022032723/56649f535503460f94c77e51/html5/thumbnails/1.jpg)
The Magnetic Field of Synchronous Machines:
Slides to Complement Class Notes
by Constantine J. Hatziadoniu
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Stator Carries a 3-phase ac winding, Rotor carries a dc winding
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Machine with Salient Poles
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The Rotor is supplied via slip rings
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One phase with concentrated winding:Flux distribution is rectangular
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One-phase distributed winding: Flux space distribution is closer to sinusoidal
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Three phase stator: positive sequence currents
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Phase a is excited by a sinusoidal current: Air-gap field is a sinusoidal (space) distribution pulsating in time
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Phase a field is a two-pole magnet; The magnetic axis passes through the middle (axis) of the winding
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Phase b bi-polar field
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Phase c bi-polar field
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All three fields added in the air-gap: The resulting field is a rotating sinusoidal distribution
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The combined field (dashed line) moving around the air gap
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…Continued
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Instances of the rotating field: Field rotates ones around the air-gap within a complete electric period
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The winding arrangement of a four-pole machine
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Phase a of the 4-pole machine: The spatial distribution varies twice in a full cycle
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Phase b of the 4-pole machine
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Phase c of the 4-pole machine
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The three distributions shown for the 4-pole machine
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Combined field is a rotating distribution
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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
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The Rotor Field of the 4-pole machine
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Rotor and Stator Fields rotate in step inside the airgap