Solenoids, Electromagnets and Electromagnetic Windings

Передня обкладинка
D. Van Nostrand, 1910 - 342 стор.
 

Зміст

Law of Magnetic Circuit
32
Practical Calculation of Magnetic Circuit
34
Magnetic Leakage
36
CHAPTER V
40
Force due to Single Turn
42
Force due to Several Turns One Centimeter Apart
45
Force due to Several Turns placed over One Another
49
Force due to Several Disks placed Side by Side
51
Force at Center of any Winding of Square Crosssection
54
Magnetic Field of Practical Solenoids
61
Ratio of Length to Average Radius
65
CHAPTER VI
69
Calculation of Maximum Pull due to Solenoids
75
Ampereturns required to saturate Plunger
79
Relation between Dimensions of Coil and Plunger
82
Relation of Pull to Position of Plunger in Solenoid
85
Calculation of the Pull Curve
93
ᎪᎡᎢ
94
Pointed or Coned Plungers
98
Stopped Solenoids
99
CHAPTER VII
102
Characteristics of Ironclad Solenoids
103
Calculation of Pull
104
Effective Range
105
Precautions
108
CHAPTER VIII
110
Calculation of Pull
111
Effect of Iron Frame
112
Most Economical Conditions
113
Position of Maximum Pull
119
Coned Plungers
120
Test of a Valve Magnet
125
Common Types of Plunger Electromagnets
129
Pushing Plunger Electromagnet 58 Collar on Plunger
130
CHAPTER IX
131
Bar Electromagnet
132
Ring Electromagnet
133
Test of Horseshoe Electromagnet
134
Ironclad Electromagnet
136
Lifting Magnets
137
Calculation of Attraction
142
Polarity of Electromagnets 68 Polarized Electromagnets
144
CHAPTER X
148
Selfinduction
149
ᎪᎡᎢ PAGE 71 Timeconstant
150
108
151
Inductance of a Solenoid of Any Number of Layers
152
110
153
CHAPTER XI
154
148
166
CHAPTER XII
168
Inductive Effect of A C Electromagnet
170
Construction of A C Ironclad Solenoids
171
A C Plunger Electromagnets
172
Horseshoe Type
174
149
175
Polyphase Electromagnets
176
CHAPTER XIII
184
Methods of reducing Sparking
185
Methods of preventing Sticking
189
CHAPTER XIV
191
Annealing
192
General Insulation
201
CHAPTER XVI
210
CHAPTER XVII
220
Notation for Insulated Wires
226
CHAPTER XVIII
229
Imbedding of Layers
232
Loss at Faces of Winding
234
Activity
237
Ampereturns and Activity
239
Volts per Turn
240
Volts per Layer
241
Activity Equivalent to Conductivity
242
Relations between Inner and Outer Dimensions of Winding and Turns Ampereturns etc
245
Approximate Rule for Resistance
246
Ampereturns per Volt
248
Constant Ratio between Watts and Ampereturns Volt age Variable
250
Length of Wire
251
Resistance calculated from Volume
252
Resistance calculated from Turns
253
Exact Diameter of Wire for Required Ampereturns
254
Weight of Insulated Wire in a Winding
255
Diameter of Wire for a Given Resistance
256
CHAPTER XIX
257
Windings on Square or Rectangular Cores
260
Insulated Wire Windings with Paper between the Layers
272
Relation between One Coil of Large Diameter and
284
Effect of Polarizing Battery
294
Heat Tests
302
TABLES AND CHARTS
304
Ratio of Conductor to Insulation in Insulated Wires
305
Values of a1 for Different Thicknesses of Insulation
310
Resistance Wires
317
Permeability Table
323
Decimal Equivalents
329
Insulation Thickness
338
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