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4-0

PowerPoint Slides to accompany

Electr ic Machinery Sixth Edition

A.E. Fitzgerald

Char les Kingsley, Jr.Stephen D. Umans

Chapter 4

Introduction to RotatingMachines




4-1

Generador sincronico elemental dedos polos

Con los devanados de campo (fieldwinding) y devanados de armadura

(armature winding)




4-2

(a) Distribución espacial de la densidad de flujo(b) Forma de onda correspondiente delvoltaje generado

Figure 4.5




4-3

Generador elemental de 4polos Figure 4.6




4-4

Distribución espacial de la densidad de flujo en ungenerador sincronico de 4 Polos Figure 4.7




4-5

Devanadode campo enun rotor

cilindricoelemental dedos polos Figure 4.8




4-6

Schematic views of three-phase generators: (a) two-pole,(b) four-pole, and (c) Y connection of the windings. Figure 4.12




4-7

Typical induction-motor speed-torque characteristic. Figure 4.15




4-8

Máquinaelemental de CDcon conmutador

Figure 4.17




4-9

(a) Distribuciónespacial de ladensidad de flujo

en el entrehierroen una máquinaelemental de Cd;(b) forma deonda de voltaje

entre lasescobillas. Figure 4.18




4-10

(a) Schematicview of fluxproduced by a

concentrated,full-pitch windingin a machine witha uniform air gap.(b) The air-gap

mmf producedby current inthis winding. Figure 4.19

C i ht © Th M G Hill C i I P i i i d f d ti di l




4-11

The mmf of one phase of a distributed two-pole,three-phase winding with full-pitch coils. Figure 4.20





4-12

The air-gap mmf of a distributed winding on the rotor of a round-rotor generator. Figure 4.21





4-13

Cross sectionof a two-pole

dc machine. Figure 4.22

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4-14

(a) Developedsketch of thedc machine of

Fig. 4.22;(b) mmf wave;(c) equivalentsawtooth mmf wave, its

fundamentalcomponent,and equivalentrectangular current sheet. Figure 4.23

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4-15

(a) Cross section of a four-pole dc machine;(b) development of current sheet and mmf wave. Figure 4.24

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4-16

The air-gap mmf and radialcomponent

of Hag for aconcentratedfull-pitch winding. Figure 4.25





4-17

Structure of typical salient-pole machines: (a) dc machineand (b) salient-pole synchronous machine. Figure 4.26




Copyright © The McGraw Hill Companies, Inc. Permission required for reproduction or display.

4-18

Finite-element solution of the magnetic field distribution ina salient-pole dc generator. Field coils excited; no currentin armature coils. (General Electr ic Company .) Figure 4.27





4-19

Single-phase-winding space-fundamental

air-gap mmf:(a) mmf distribution of a single-phasewinding at

various times;(b) total mmf Fag1

decomposed intotwo travelingwavesF – and F +;

(c) phasor decompositionof Fag1.

Figure 4.28





4-20

Simplifiedtwo-polethree-phase

stator winding. Figure 4.29




py g p , q p p y

4-21

Instantaneous phase currents under balancedthree-phase conditions. Figure 4.30




py g p , q p p y

4-22

The production of a rotating magnetic field by meansof three-phase currents. Figure 4.31




y g y

4-23

Cross-sectionalview of anelementary

three-phaseac machine. Figure 4.32




4-24

Voltage between the brushesin the elementary dc machineof Fig. 4.17. Figure 4.33




4-25

Elementary two-pole machine with smooth air gap:(a) winding distribution and (b) schematic representation. Figure 4.34




4-26

Simplified two-pole machine: (a) elementary model and(b) vector diagram of mmf waves. Torque is producedby the tendency of the rotor and stator magnetic fields

to align. Note that these figures are drawn with

sr positive,i.e., with the rotor mmf wave Fr leading that of the stator Fs. Figure 4.35




4-27

The mmf andH field of aconcentrated

full-pitch linear winding. Figure 4.36




4-28

Typicalopen-circuitcharacteristic

and air-gapline. Figure 4.37




4-29

Finite-elementsolution for theflux distribution

around asalient pole.(General

Electr ic

Company.) Figure 4.38




4-30

Flux-densitywavecorresponding

to Fig. 4.38with itsfundamentaland third-harmonic

components. Figure 4.39




4-31

Three-coil system showing components of mutualand leakage flux produced by current in coil 1. Figure 4.40




4-32

Flux createdby a singlecoil side in

a slot. Figure 4.41




4-33

Problem 4.8: (a) full-pitch coil and (b) fractional-pitch coil. Figure 4.43




4-34

Elementarygenerator for Problem 4.13. Figure 4.44




4-35

Elementarycylindrical-rotor,two-phasesynchronousmachine for Problem 4.22. Figure 4.45




4 36

Schematic two-phase, salient-polesynchronous

machine for Problem 4.24. Figure 4.46

maquinas generalidadesch04[1]

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