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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

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

by Constantine J. Hatziadoniu





One phase with concentrated winding flux distribution is rectangular
One phase with concentrated winding: windingFlux distribution is rectangular




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


Phase b bi polar field
Phase b bi-polar field through the middle (axis) of the winding


Phase c bi polar field
Phase c bi-polar field through the middle (axis) of the winding


All three fields added in the air gap the resulting field is a rotating sinusoidal distribution
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
The combined field (dashed line) moving around the air gap is a rotating sinusoidal distribution


Continued
…Continued is a rotating sinusoidal distribution


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
The winding arrangement of a four-pole machine the air-gap within a complete electric period



Phase b of the 4 pole machine
Phase b of the 4-pole machine varies twice in a full cycle


Phase c of the 4 pole machine
Phase c of the 4-pole machine varies twice in a full cycle



Combined field is a rotating distribution
Combined field is a rotating distribution varies twice in a full cycle


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
The Rotor Field of the 4-pole machine period—the machine speed is reduced to half the speed of a 2-pole machine


Rotor and stator fields rotate in step inside the airgap
Rotor and Stator Fields rotate in step inside the period—the machine speed is reduced to half the speed of a 2-pole machineairgap


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