Alfred Still.

Principles of electrical design; d. c. and a. c. generators online

. (page 30 of 30)
Online LibraryAlfred StillPrinciples of electrical design; d. c. and a. c. generators → online text (page 30 of 30)
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267, 357

of circular lifting magnets, 67
of commutator, 181, 227
of dynamo field coils, 193, 232
of iron-clad coils, 46
of magnet coils, 44, 47, 56, 62
of totally enclosed motors,

236
Third harmonic, effect of Y and A

connections on, 246
THOMPSON-RYAN, referred to, 170
Three-phase generators (see Alter-
nator).
Time, value of, in engineering work,

64
Tooth saturation (comparison D.C.

and A.C.), 271

Tractive force (magnetic pull), 29
of cylindrical short-stroke mag-
nets, 50

Tube of induction, 14
Turbo-alternator, design sheets for

8,000 k.v.a., 322

Turbo-alternators, output of mod-
ern, 320

(rotor construction), 270
(usual speeds), 242, 320



INDEX



365



U

Undercutting commutator mica, 181
UNDERBILL, C. R., referred to, 48
Units, conversion of centimeter to
inch, 2

V

Vector diagrams of alternator:
For determining inherent regula-
tion, 315

Of short-circuited armature, 308
On lagging power factor, 289, 290,

311, 334

On zero power factor, 287, 307
Velocity of air in cooling ducts, 268,

357

peripheral (see Peripheral ve-
locity).
Ventilating fans, power necessary

to drive, 107, 318
Ventilation of armatures, 105, 261,

351
Virtual values of irregular waves,

294, 346

Voltage (see also E.m.f.).
drop at brush contact, 179
generated by cutting flux, 71
rise when switching current off
coil, 33



Voltage,usual, of A.C. generators, 248
Voltages to be considered in connec-
tion with insulation problems, 33



W



WADDELL, DR. J. A. L., referred to, 5
WALKER, PROF. M., referred to,

107, 255

Wave form (see E.m.f. wave form).
Wave winding (dynamos), 86
Wedge for rotor slots, 336
Whirling speed of rotors, 326
Windage, loss due to, 196, 317, 356
Winding, depth of, to give required

excitation, 43
on magnet limbs, 55
shunt coils with two sizes of wire,

43

Windings (see Armature field, mag-
net, windings).
Wire (see also Copper wire),
enamelled, 38
tables, 34, 35



Y connection, 244

Yoke ring, dimensions of, 228









JUL 7 1933
30 1953




r/r



338041



UNIVERSITY OF CALIFORNIA LIBRARY






Online LibraryAlfred StillPrinciples of electrical design; d. c. and a. c. generators → online text (page 30 of 30)