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

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

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


Machine with salient poles

Machine with Salient Poles


The rotor is supplied via slip rings

The Rotor is supplied via slip rings


One phase with concentrated winding flux distribution is rectangular

One phase with concentrated winding:Flux distribution is rectangular


One phase distributed winding flux space distribution is closer to sinusoidal

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


Three phase stator positive sequence currents

Three phase stator: positive sequence currents


The magnetic field of synchronous machines slides to complement class notes

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


Phase c bi polar field

Phase c bi-polar field


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


Continued

…Continued


The magnetic field of synchronous machines slides to complement class notes

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


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

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


Phase b of the 4 pole machine

Phase b of the 4-pole machine


Phase c of the 4 pole machine

Phase c of the 4-pole machine


The three distributions shown for the 4 pole machine

The three distributions shown for the 4-pole machine


Combined field is a rotating distribution

Combined field is a rotating distribution


The magnetic field of synchronous machines slides to complement class notes

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


Rotor and stator fields rotate in step inside the airgap

Rotor and Stator Fields rotate in step inside the airgap


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