The Magnetic Circuit in Theory and Practice

Portada
Longmans, 1896 - 362 páginas

Dentro del libro

Contenido

Magnetically Indifferent Toroid
10
Ferromagnetic Toroid Magnetic Induction
12
Saturation Magnetisation
13
Summary
15
Curves of Magnetisation Curves of Induction
16
Susceptibility Permeability Reductivity
19
Perfect and Imperfect Magnetic Circuits
21
CHAPTER II
23
Shearing Backward Shearing
25
Action at a Distance of a Single End
26
General Remarks about the Law of Action between Points
28
Attraction or Repulsion between the Ends
29
Action at a Distance of a Pair of Ends
30
Mechanical Action of External Fields on Pairs of Ends
31
Demagnetising Action of a Bar
32
Demagnetising Factors of Circular Cylinders
34
CHAPTER III
41
Complex Solenoidal Distribution
48
ARTICLE CONTENTS
50
LamellarSolenoidal Distribution
54
LineIntegral of the Demagnetising Intensity
55
Properties of the Resultant Magnetic Intensity
56
Properties of the Magnetisation
57
Properties of the Resultant Magnetic Induction
58
Practical Approximation
59
Ferromagnetic Body conveying a Current
60
Conservation of the Flow of Induction
61
Action of a Permanent Magnet at External Points
62
Representation of the Field by means of Unit Tubes
63
Induced Electromotive Force
64
Faradays Lines of Force
65
Statement of the Problem of Magnetisation
66
Similar Systems Lord Kelvins Rules
67
Uniform Magnetisation
68
Magnetic Intensity and Magnetic Induction within Ferro
69
Further Special Cases
70
Solution by Successive Superposition xiii
71
PAGE
76
MAGNETISATION OF CLOSED AND OF RADIALLY DIVIDED TOROIDS A Theoretical 72 Peripheral Magnetisation of a Solid of Revolution
105
Kirchhoffs Theory
106
Rings of Rectangular and of Circular Section
108
Fundamental Equation of a Radially Divided Toroid
109
First Approximation Limiting Case
111
Divergence of the Lines of Induction 111
114
ARTICLE
115
Leakage Coefficient
116
Magnetic EndElements on the Boundary Surface 80 Second Approximation 117
118
Toroid with several Radial Slits V
121
B Experimental 83 The Iron Toroid Examined
123
Standardisation of the Ballistic Galvanometer
124
Tracing the Normal Curve of Magnetisation
125
Arrangement of the Slit
127
The Curves of Magnetisation
129
Discussion of the Principal Results
130
Comparison of Theory and Experiment
132
Empirical Formula for the Leakage
137
ARTICLE PART IIAPPLICATIONS
139
CHAPTER VI
141
Experiments of Oberbeck with Local Coils
142
Further Experiments by Von Ettingshausen and Mues
143
Theoretical Explanation of the Experiments
145
SelfCompensating Effect of Leakage
146
B Hopkinsons Synthetic Method 96 Principles of the Method
148
Application to Radially Divided Toroids
150
Graphical Representation Transformation of Curves
151
Second Approximation Correction for Leakage
152
Generalisation of the Method
154
Electromagnetic Stress 101 Specification of the state of Stress
155
Resultant Tension in the
156
Theoretical Lifting Force of a Diametrically Divided Toroid
158
Resolution and Interpretation of Maxwells Equation
160
Magnetic Lifting Force 105 Older Investigations
161
Wassmuths Experiments
162
Bidwells Experiments Sources of Error
163
Bosanquets Experiments
164
Conclusions from Maxwells
167
LoadRatio of a Magnet
168
CHAPTER VII
170
Older Developments First Stage 112 Continuation Faraday Maxwell
171
123
172
Summary PAGE
174
124
178
125
189
127
192
CHAPTER X
193
130
195
146
220
CHAPTER IX
224
148
226
ARTICLE PAGE 149 Influence of Shape Retentivity Coercive Intensity
228
150
230
151
232
152
235
Time Variations of the Magnetic Conditions
236
154
237
155
239
156
241
Sinusoidal Electromotive Forces
244
158
245
Mechanisms depending on Electromagnetism
247
160
248
161
249
162
250
163
252
164
253
Electromagnets with Large Lifting Power
255
Description of some Types of Electromagnets
256
167
258
168
261
Description of the Electromagnet
262
170
263
171
265
172
267
Influence of Leakage
268
174
269
Experiments with Truncated Cones
271
Mutual Induction
273
Action of Induction Coils
275
Magnetic Circuit of Induction Coils
276
Simultaneous Differential Equations of Transformers
277
Action of an Ideal Transformer
279
Influence of Saturation and of Hysteresis
281
Influence of Leakage
282
Transformer Diagrams
283
Core and Shell Transformers
285
Magnetic Circuit of Transformers
286
Eddy Currents Screening Action
287
EXPERIMENTAL DETERMINATION OF FIELD INTENSITY ARTICLE PAGE 188 General Introduction
289
Distribution of Magnetic Fields
290
A Magnetometric Methods 190 Plan of Gausss Method
292
Observations of Deflection
294
B Electrodynamic Methods 192 Measurement of a Dynamical Force
296
Measurement of a Torque
297
Measurement of a Hydrostatic Pressure
298
Methods of Induction 195 Arrangement of the Exploring Coil
300
Ballistic Galvanometer
301
Standard Flux of Induction
303
Measurement of a Field by Damping
306
Magnetooptical Methods 199 Rotation of the Plane of Polarisation
307
Standard Glass Plates
308
E Halls Phenomenon MagnetoElectrical Alteration of Resistance 201 Halls Phenomenon
310
Measurement of a Field by Bismuth Spirals
311
F MagnetoHydrostatic Method 203 Principle of the Method
314
Practical Execution
315
CHAPTER XI
317
Discussion of the Shape of the TestPiece
318
Details of the Method
319
Determination of Distribution
320
A Magnetometric Methods 209 Plan of the Experiments
321
Virtual Length of the Magnet
323
ARTICLE PAGE 211 Helmholtzs Method Compensating Coil
324
Searles Curve Tracer
325
Eickemeyers Differential Magnetometer
327
B Electrodynamic Methods 214 Ewings Curve Tracer
328
Apparatus of Koepsel and of Kennelly
331
Induction Methods 216 The Ballistic Method
332
Isthmus Method
333
Yoke Method
335
Various Forms of Closed Yoke
336
Case of great SelfInduction
337
Methods of J and B Hopkinson and of T Gray
339
Kerrs Phenomenon
340
Kundts Phenomenon
342
E Halls Phenomenon Bismuth Spiral 224 Halls Phenomenon Bismuth Spiral
343
F Traction Methods
344
Thompsons Permeameter
345
Magnetic Balance
346
Use of the Balance
349
Magnetohydrostatic Methods
350
INDEX OF NAMES
353
INDEX OF SUBJECTS
356
NOMENCLATURE
361

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