The performance and design of direct current machines.
Material type: TextPublication details: New Delhi : CBS, 1986cEdition: 3d edDescription: 516 p. illus. 23 cmISBN: 9788123909276 (pbk)Subject(s): Electric machinery -- Direct current. [from old catalog]DDC classification: 621.3132 LOC classification: TK2612 | .C6 1959Item type | Current library | Call number | Status | Date due | Barcode | Item holds |
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Books | Namal Library Electrical Engineering | 621.3132 CLA-P 1986 4384 (Browse shelf (Opens below)) | Available | 0004384 |
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621.31244 LYN-E 2010 2008 Electricity from sunlight : an introduction to photovoltaics | 621.3126 DAH-S 2010 2322 Sub-station engineering ,design, concept and computer application. | 621.313 SAY-P 1983 4385 The performance and design of alternating current machines; transformers, three-phase induction motors and synchronous machines, | 621.3132 CLA-P 1986 4384 The performance and design of direct current machines. | 621.3132 CLA-P 2004 9415 The performance and design of direct current machines / | 621.3134 MUR-S 2011 3473 Synchronous machines and DC motors / | 621.3138 NAN-T 1997 2769 Television and vcr technology / |
Index present
CHAPTER I
GENERATION OF E.M.F. : WORK; POWER; TORQUE 1
Homopolar machine — Heieropolar machme--K.m.f. induced in
d.o. machine — Wave shape of induced e.m.f. — Flux distribution
curve and frmging — Average value of induced e.m.f. — Dir(»ctJon
of induced e.m.f. — Force on conductor carrying current —Power
developed by armature — Torque develo{>ed by armature.
CHAPTER II
MAGNETIC CIRCUIT OF THE DIRECT CURRENT MACHINE 14
The laws of the magnetic circuit — Unite-- Relative peimeabiht \ -
Magnetization curves for iron — Magnetic circuit of d.o. machine -
Flux distribution curve or field form— R<ductanco of the air j^ap -
Active iron length —Armature teeth — TajM^rtni teeth — Ktial and
apparent flux density — Armature cor© — Polo shoos Form of fH>le
section— Magnetic leakage — Effect of load upon leakage cmdTicient
—The yoke — Magnetization curve of dr. machine - Kffect of
saturation upon field form — Field form and voltage between
commutator segmenta— Flux plotting
CHAPTER JII
ARMATURE WINDINGS ....... 53
Drum windings — Two layer windings— Coil span —Wind uig pitch
— Commutator pitch — Numberuig armature conduct/ora— Suiiple
lap winding — Equalizing rings — Choice ot numb(*r of slots for lap
windings — Simple wave or series wmding — CTioico of number of
slots for wave windings- -Dununy coils — Brusli sets and brush
position for simple wave winding — Voltage between adjacent
segments — Multiplex windings — Duplex lap windings— £^uabzing
connetciona to duplex lap windings — Duplex wave windings —
Triplex wmdinge
CHAPTER IV
ARBfATURE REACTION 90
Magnetizing action of anmature currents — m.mY. eatabliahed by
a fulbpitched drum coil — Flux distribution due to annatura
curreata — Armature reaction and flux distribution curve — Effsot
of brush lead— Effect of saturation upon flux distribotkMi —
Domagnetisii^ and cro« xnagnatiz^ ampm*tunis — Armatuxe
reaction and iron losses — Comfiensating windings.
1 CONTENTS
CHAPTER V
GROWTH 07 OURBBMT IK A GZBOUTT; XROK LOSSES
Inductance — Growth of a d.c. — Decay of current in a closed circuit
— Reversal of a d.c. — Energy of the magnetic field — Magnetic pull
between poles and armature — Magnetic hysteresis — Eddy current
loss — Total iron loss curves — Iron losses in d.c. machines.
CHAPTER VI
COMMUTATION
brush contact resistance — Current density — E.m.f. induced ir coil
undergoing commutation — Time of commutation — Slot permeance
— {..eakage ac:ro88 tooth tips — Inductance of end connexions —
Total inductance — Reactance e.m.f. — Commutation in non-
interpole machines — Interpoles — Calculation of flux density —
Calculation of ampere-turns for mterpole windings — Interpole
shoo width — Magnetic leakage with mterpole machines — Com-
mutation with bar windings — Interpole ampere-tums with com-
{x^nsating windings.
CHAPTER VII
EXCITATION AND FIELD WINDINGS .....
Separate excitation — Self excitation — Shunt generator — Effect of
speed upon self excitation — Failure to excite — Reversed polarity —
^ries generator — Compound-Wound generator — Field windings
- Calculation of shunt coils — Calculation of series coils.
CHAPTER VIII
LOAD CHARACTERISTICS OF DIBECT CURRENT GENERATORS .
External characteristic of separately excited and shunt generator
— Series generator characteristic — Compound generator char-
acteristic — Generators m parallel — Equalizing connexion.
CHAPTER IX
LOAD CHARACTERISTICS OF DIBECT CURRENT MOTORS .
Hack e.m.f. induced m motor armature — Load characteristics
ot shunt, senes, and compound motors— Speed voltage character-
istics of motom — Parallel operation — Series operation.
CHAPTER X
CONTROL OP DIRECT CURRENT MOTORS
Constant voltage and variable field — Variation of voitage applied
to armature — Ward-Leonard control — Use of variable voltage
booster — Motors on rectifier supplies — Starting torque and
acceleration — Grading of starting resistances — Graphical con-
struction — Energy dissipated in rheostats — Economy of series-
parallel starting — Drum end contactor controllers — Automatic
accelerat ion — Electric braking.
PAOI
106
131
163
180
197
207
CONTENTS xi
CHAPTER XI
PAOl
EFnCIENCY— TEMPERATURE RISE— VENTILATION . . . 242
Iron loaaes — Electrical losses — Mechanical loases — Efticiericy curve
Maximum efficiency — Maximum output — TemjHjraiure rise—
Tempierature curve— Rating of electrical mat'hmery— Prede-
termination of temperature rise— Ventilation — Totally enclosed
machines.
CHAPTER XII
ITINO 2&2
Brake tests — Swinburne's method of compiiimg efficiency-'
Differential tests— Hopkmson tests — Temperature tests -Sefiara-
tpon of iron and friction loss —Separation of hystt^resis anti ctldy
current losses— Torque wastetl in iron losses - Ueiardation test-
rommutation tests - Armature laultn.
CHAITER
SPECIAL MACHINES 296
Shunt, or separately -excited Ijooster — Senes boosters for irat lion
work— Buffer batteries-' Battery boosters - Shunt woimd exciu*r
- -The D>Tiamotor — Balancers - Special character istics- - I'hree
held (Kramer) generator— Austin constant curren! generator *-
Welding generators —Two-stage machines— Cross-field rnat'hiiies -
The inetadync generator— Amplidyne - Magnicon -Metadyne
converter — Consequent-pole rnachint'S --Motors for coimlnut-
current systems — Split-held motors.
CHAPTER XIV
insulation — ARMATURE AND FIELD COILS . . .331
Cla.S'tdication - Varnishes and ensunels Insulateri wires- Ta|>es -
Flexible sheet materials — Boards — V^arnish treatment —Armature
coils - Thicknea'i of insulation — Field windings —Space factor.
CHAPTER XV
MECHANICAL DETAILS 355
Magnet system— Main polos — Interpoiea — Armature — Commu-
tator — Brushes — Brush hoKlors — Angle between ‘brush and com-
mutator— Staggering of brushes — ^The shaft — Bearings — Traction
motors — Industrial motors - Mill moton.
i
CONTENTS
CHAPTER XVI
BSIQN CONSIDXBATIONS 391
Fiindament-al output relations — Flux density in the air gap—
Armature strength or specific electric loading — Esson output
coefficient — Variation in output coefficient with dimensions —
Number of poles — Pole pitch-^ore length — Armature diameter —
Ratio pole arc to pole pitch.
CHAPTER XVII
SSION OF D.c. generator; main dimensions; armature 405
Preliminary determinations — Main dimensions, number of poles
being given — Design of armature stampings and winding —
Mean e.m.f. induced per conductor — Number of conductors m
series on the armature — Number of slots — Dimensions of armature
conductor — Slot design — C!ore length final dimensions — Depth of
armature core — Armature winding — Equalizing connexions —
Armature conductor length — Overhang of the winding — Weight of
copper — Resistance of winding.
CHAPTER XVIII
)Esiqn ; the field system 424
The field magnet— Polo sectional area — Pole height— The yoke- -
The air gap — Magnetization curve — Iron losses— Armature tem-
perature rise— Commutator design— Brushes— Field winding
design— Interpole design — Bearmg friction and windage — Total
losses and efficiency.
CHAPTER XIX
further EXABiFLES OF DESIGN OF MOTORS AND OBNEBATOKS 445
Other designs based on a given 1,000 kW generator — Design based
on output per pole — Physical limits to d.c. machines — Design of
motors — Examples of choice of armature windings — Design data
for various generators and motors.
CHAPTER XX
EDDY CURRENT LOSSES IN ARMATURE CONDUCTORS . 473
Eddy current losses with sinusoidal currents — Eddy current losses
in d.c. armature conductors — Variation of t<jtal losses with
conductor depth.
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