Magnetic Permeability Concordance
Magnetic Permeability
Section titled “Magnetic Permeability”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
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Section titled “Matched Aliases”Magnetic permeability, magnetic permeability, permeability
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 34 | 9 |
| Theoretical Elements of Electrical Engineering | 13 | 4 |
| Theory and Calculation of Electric Circuits | 13 | 4 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 11 | 5 |
| Theory and Calculation of Alternating Current Phenomena | 10 | 4 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 10 | 5 |
| Theory and Calculation of Alternating Current Phenomena | 8 | 3 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 7 | 1 |
| Theory and Calculation of Alternating Current Phenomena | 7 | 2 |
| Radiation, Light and Illumination | 4 | 1 |
| Four Lectures on Relativity and Space | 2 | 1 |
| Theory and Calculation of Electric Apparatus | 1 | 1 |
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Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Chapter 6: Alternating Magnetic Flux Distribution - 15 hit(s)
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CHAPTER VI. ALTERNATING MAGNETIC FLUX DISTRIBUTION. 48. As carrier of magnetic flux iron is used, as far as possible, since it has the highest permeability or magnetic conductivity. If the magnetic flux is alternating or otherwise changing rapidly, an e.m.f. is generated by the change of magnetic flux in the iron, and to avoid energy losses and demagnetization by the currents produced by these e.m.fs. the ir ...Chapter 3: Trigonometric Series - 7 hit(s)
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... sen: 16 -1^ ^^ . ■ ■ — io- — 8- / / o c L/ ■ i2 / / o / X ^ } i \ 1 0 1 2 1 t 1 5 1 i 2 »- i 1 i 28 3Q Fig. 51. Magnetization Curve. Example i. Determine that magnetic density (B, at which tlie permeability /it of a sample of iron is a maximum. The relation between magnetic field intensity 5C, magnetic density (35 and permeability jk cannot be expressed in a mathematical equation, and is therefore usually given in the form of an 1400 1200 ^ , -■ b. ...Theory Section 1: Magnetism and Electric Current - 7 hit(s)
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... ghtly less in diamagnetic materials.) The ratio of the number of lines of force in a medium, to the number of lines of force which the same magnetizing force would produce in air (or rather in a vacuum), is called the permeability or magnetic conductivity /* of the medium. The number of lines of force per square centimeter in a mag- netic medium is called the magnetic induction B. The number of lines of force produced by the same magnetizing force ...Chapter 12: Effective Resistance And Reactance - 7 hit(s)
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... ariable. In an ironclad electric circuit — that is, a circuit whose mag- netic field exists entirely within iron, such as the magnetic cir- cuit of a well-designed alternating-current transformer — (R is the reluctance of the iron circuit. Hence, if /* = permeability since Fk and and ^= $ F IF ^ ^ IH ^ m.m.f., $ = A(B = fiAH =^ magnetic flux, 10 Z . (R = 4:Tr/JiA substituting this value in the equation of the admittance, (R 10^ 130 ALTERNATING-CURRENT PHENOMENA we have . y'SwVfjiAf-fu.' ...Chapter 5: Magnetism - 7 hit(s)
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CHAPTER V MAGNETISM Magnetic Constants 47. With the exception of a few ferromagnetic substances, the magnetic permeability of all materials, conductors and dielectrics, gases, liquids and solids, is practically unity for all industrial purposes. Even liquid oxygen, which has the highest permea- bility, differs only by a fraction of a per cent, from non-magnetic materials. T ...Chapter 7: Distribution Of Alternating-Current Density In Conductor - 7 hit(s)
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... t fully utilized, but the material in the interior of the conductor is more or less wasted. It is of importance, therefore, in alternating- current circuits, especially in dealing with very large currents, or with high frequency, or materials of very high permeability, as iron, to investigate this phenomenon. An approximate determination of this effect for the purpose of deciding whether the unequal current distribution is so small as to be negligible in its effect on the resistance of the conductor, 369 370 TRAN ...Chapter 10: F - 6 hit(s)
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... , a circuit whose magnetic field exists entirely within iron, such as the mag- netic circuit of a well-designed alternating-current trans- J 82] EFFECTIVE RESISTANCE AND REACTANCE. 123 former, — (R is the reluctance of the iron circuit. Hence, if ;x = permeability, since — and $F^ = Z-F= :?^Z3C = M.M.F., * = 5CB = /A 5 JC = magnetic flux, and (R = ; ; 4 TT/XO substituting this value in the equation of the admittance, (R10« , Z10» z y = ;^ TTr» ^^ have where z = 2 7r«W Stt^z/V-STV^ ^ft' Z10» 127Z10« ...Chapter 10: Effective Resistance And Reactance - 6 hit(s)
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... at is, a circuit whose magnetic field exists entirely within iron, such as the mag- netic circuit of a well-designed alternating-current trans- EFFECTIVE RESISTANCE AND REACl^ANCE. 123 former, — (R is the reluctance of the iron circuit. Hence, if p. = permeability, since — and g:A = jr/7=Zge = M.M.F., and <R, 10L magnetic flux, substituting this value in the equation of the admittance, (R 108 Z 109 z y= -z- nrv> we have 5— ; where „ L W 127Z10' TJierefore, in an ironclad circuit, the absolute admi ...Lecture 5: Single-Energy Tra.Nsient Of Ironclad Circuit - 4 hit(s)
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... t thus is the simple exponential discussed before. If the magnetic circuit is closed entirely by iron, the magnetic flux is not proportional to the current, and the inductance thus not constant, but varies over the entire range of currents, following the permeability curve of the iron. Furthermore, the transient due to a decrease of the stored magnetic energy differs in shape and in value from that due to an increase of magnetic energy, since the rising and decreasing magnetization curves differ, as shown by the hyste ...Lecture 5: Single-Energy Transient Of Ironclad Circuit - 4 hit(s)
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... t thus is the simple exponential discussed before. If the magnetic circuit is closed entirely by iron, the magnetic flux is not proportional to the current, and the inductance thus not constant, but varies over the entire range of currents, following the permeability curve of the iron. Furthermore, the transient due to a decrease of the stored magnetic energy differs in shape and in value from that due to an increase of magnetic energy, since the rising and decreasing magnetization curves differ, as shown by the hyste ...Lecture 2: Relation Of Bodies To Radiation - 4 hit(s)
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... n neglecting the energy losses in and by the con- ductor: S = -L= , (5) VLC where L is the inductance, C the capacity of the conductor per unit length (the length measured in the same measure as the speed S). The inductance L is proportional to the permeability /*, and the capacity C proportional to the dielectric constant, or specific capacity K of the medium surrounding the conductor, that is, the medium through which the electric wave propagates; that is, A V p* where A is a proportionality constant. Th ...Theory Section 19: Fields of Force - 4 hit(s)
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... ace also, and this space is not neutral and inert any more, but if we try to move a solid mass of metal rapidly through it, the motion is resisted, and heat produced in the metal by induced currents. Materials of high permeability, as iron filings, brought into this space arrange themselves in chains; a magnetic needle is moved and places itself in a definite direction. Due to the passage of the current in the conductor, there are therefore in the ...Chapter 1: The Constants Of The Electric Circuit - 4 hit(s)
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... to the section and inversely proportional to the length of the magnetic circuit surrounding the conductor, and so can be represented by L = ^ (18) where /* is a constant of the material filling the space surround- ing the conductor, which is called the magnetic permeability. As in general neither section nor length is constant in differ- ent parts of the magnetic circuit surrounding an electric con- 10 TRANSIENT PHENOMENA ductor, the magnetic circuit has as a rule to be calculated piecemeal, or by integration over the s ...Lecture 2: The Electric Field - 3 hit(s)
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... ampere turns per cm. in empty space. The magnetic density, in lines of magnetic force per cm2, pro- duced by the field intensity 3C in any material is & = /z3C, (15) where ju is a constant of the material, a " magnetic conductivity," and is called the permeability. ^ = 1 or very nearly so for most materials, with the exception of very few, the so-called magnetic materials: iron, cobalt, nickel, oxygen, and some alloys and oxides of iron, manganese, and chromium. If then A is the section of the magnetic circuit, th ...Chapter 3: Magnetism - 3 hit(s)
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... ides, "leaks" or "strays." (c) In the electric circuit, current and e.m.f . are proportional, in most cases; that is, the resistance is constant, and the circuit therefore can be calculated theoretically. In the magnetic circuit, in the materials of high permeability, which are the most important carriers of the magoietic flux, the relation between flux, m.m.f. and energy is merely empirical, the "reluctance" or mag- netic resistance is not constant, but varies with the flux density, the previous history, etc. In the ...Lecture 2: The Electric Field - 2 hit(s)
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... D = -^joules. Magnetomotive force: F = ni ampere turns. Magnetizing force: F / = -y ampere turns per cm. Magnetic-field intensity: JC = 47r/10-^ lines of magnetic force per cm^. Magnetic density: CB = mJC lines of magnetic force per cm^. Permeability: n Magnetic flux: $ = A(^ lines of magnetic force. Dielectric Field. Dielectric flux: ^ = Ce lines of dielectric force, or coulombs. Capacity current: '^Tt=^dt^'^'^'''^'' Dielectric energy: w = -^joules. Electromotive force: e = volts. E ...Lecture 6: Double-Energy Transients - 2 hit(s)
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... 28-mile line by low-tension switches off a substation at the end of a 153-mile transmission line, at 88 kv. With decreasing voltage, the magnetic density in the transformer DOUBLE-ENERGY TRANSIENTS. 65 decreases, and as at lower magnetic densities the permeability of the iron is higher, with the decrease of voltage the permeability of the iron and thereby the inductance of the electric circuit inter- linked with it increases, and, resulting from this increased magnetic energy storage coefficient L, there follows a ...Lecture 6: Double-Energy Transients - 2 hit(s)
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... 28-mile line by low-tension switches off a substation at the end of a 153-mile transmission line, at 88 kv. With decreasing voltage, the magnetic density in the transformer DOUBLE-ENERGY TRANSIENTS. 65 decreases, and as at lower magnetic densities the permeability of the iron is higher, with the decrease of voltage the permeability of the iron and thereby the inductance of the electric circuit inter- linked with it increases, and, resulting from this increased magnetic energy storage coefficient L, there follows a ...