The magnetic field of synchronous machines slides to complement class notes
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The Magnetic Field of Synchronous Machines: Slides to Complement Class Notes PowerPoint PPT Presentation


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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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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


One phase with concentrated winding:Flux distribution is rectangular


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


Three phase stator: positive sequence currents


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


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


Phase b bi-polar field


Phase c bi-polar field


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


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


…Continued


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


The winding arrangement of a four-pole machine


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


Phase b of the 4-pole machine


Phase c of the 4-pole machine


The three distributions shown for the 4-pole machine


Combined field is a rotating distribution


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


The Rotor Field of the 4-pole machine


Rotor and Stator Fields rotate in step inside the airgap


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