A Text-book of Electrical Engineering

Front Cover
Longmans, Green, 1910 - Electric engineering - 464 pages
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Contents

Measurement of electromotive force by the potentiometer method
18
Joules law electrical energy and electrical power
19
Potential difference
21
Energy lost in heating conductor
23
CHAPTER II
26
Quantitative laws of electrolysis
29
Polarisation
32
Accumulators
34
Primary cells
39
The voltameter
41
CHAPTER III
43
Strength of magnetio field
44
2L Lines of force
46
Magnetic potential
48
Iron in a magnetic field
50
The earths field
51
CHAPTER IV
52
PAGE
53
2i Magnetic effect of a singleturn coil
56
Magnetic field of a solenoid
59
Magnetisation curves 01
61
The magnetic circuit
65
The lifting power of an electromagnet
71
Hysteresis
73
Dynamic effect of parallel currents
77
Induced electromotive force
78
The laws of mutual induction
83
Selfinduction
85
Eddy currents
89
The units of length mass and time in the absolute system
93
Dimensions and units of velocity acceleration and foroe
94
Dimensions and units of polestrength fieldstrength and magnetic flux
96
Dimensions and units of electromotive force current quantity of electricity and resistance
97
Dimensions and units of energy heat and power
100
Dimensions and units of the coefficient of selfinduction and of capacity
101
CHAPTER VI
104
Bipolar drumwinding
109
Multiple circuit ringwinding
114
Multiple cirouit drumwinding
117
Twocircuit ringwinding
122
Twocircuit drumwinding
125
Seriesparallel ringwinding
129
Seriesparallel drumwinding
133
CHAPTER VII
136
The field magnets
139
Position of the brushes
144
Armature reaction
146
Sparkless commutation
151
Threewire dynamos
158
CHAPTER VIII
162
Characteristics of series dynamo
170
Characteristics of shunt dynamo
171
Dynamo and battery in parallel
175
Constantcurrent variablespeed dynamo
182
The efficiency of dynamos
189
CHAPTER IX
191
Torque speed and output of a d c motor
194
Motor with constant excitation
198
The starting and regulation of a shunt motor
203
Principles of the series motor
209
Example of traction motor calculation
213
The regulation of series motors
216
Heating of motors
221
CHAPTER X
224
The electrolytic mean or average value of an alternating current
228
Resistance and capacity in series
255
Circuit containing resistance inductance and capacity
256
Selfinduction and capacity in parallel
258
CHAPTER XI
260
The magnetising current
261
The hysteresis current
262
Transformer on noninductive load
265
Transformer on inductive load
271
The effect of magnetic leakage
274
CHAPTER XII
279
The mean e m f of a generator
285
The effective e m f with sinusoidal field
286
The e m f with 1 2 or 3 slots per polephase
288
The e m f of a distributed winding
291
The e m f of a closed d c winding
293
CHAPTER XIII
296
The ampereturn diagram
300
Calculation of armature reaction
301
Experimental determination of armature reaction and armature leakage
305
Predetermination of exciting current and pressure regulation
307
10L Effect of polar leakage
310
CHAPTER XIV
313
Synchronising power of armature
319
The parallel connection of alternators
321
The effect of field regulation on alternators in parallel
324
Phaseswinging of alternators
330
CHAPTER XV
336
Synchronous motor with constant excitation and variable load
338
Synchronous motor with constant load and variable excitation
341
The rotary field in a twophase motor
344
The rotary field in a threephase motor
347
Mesh or delta connection
348
Star connection
351
The measurement of power in polyphase circuits
354
General principles of the rotor
357
CHAPTER XVII
361
The magnetic flux of an induction motor
365
The effect of the iron in the magnetic path
370
The torque of an induction motor
375
Calculation of slip
378
Calculation of the electromotive force
380
CHAPTER XVIII
383
The circlediagram neglecting primary losses
386
Output torque and slip from the circlediagram
389
Normal load starting torque and maximum torque
392
Ossannas circle diagram
395
Ossannas circle diagram continued
399
The most convenient form of the circlediagram
401
Practical example
405
The leakage factor
409
CHAPTER XIX
416
The circlediagram of the singlephase motor
419
Singlephase commutator motors
422
The electromotive forces in commutator motors
426
The vectordiagram of the repulsion motor
429
The vectordiagram of the WinterEiohberg motor
432
CHAPTER XX
435
Armature copper loss in rotary converters
438
Comparison between rotary converters and directcurrent generators with regard to armature copper loss
440
Sixphase rotary converters
442
La Cours motor converter
444
Appendix
447
List op Symbols used
457
Index
459

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