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   Inductors, Variable

An inductor is a passive electrical device employed in electrical circuits for its property of inductance. An inductor can take many forms.

Inductance (measured in henries) is an effect which results from the magnetic field that forms around a current carrying conductor. Electrical current through the conductor creates a magnetic flux proportional to the current. A change in this current creates a change in magnetic flux that, in turn, generates an electromotive force (emf) that acts to oppose this change in current. Inductance is a measure of the generated emf for a unit change in current. For example, an inductor with an inductance of 1 henry produces an emf of 1 V when the current through the inductor changes at the rate of 1 ampere per second. The inductance of a conductor is increased by coiling the conductor such that the magnetic flux encloses (links) all of the coils (turns). Additionally, the magnetic flux linking these turns can be increased by coiling the conductor around a material with a high permeability.



Bronze Partners
Allied Components International
Amecon, Inc.
Amidon Inductive Components
API Delevan Inc.
Armbar Industries, Inc.
ATC-Frost Magnetics / Standex Electronics
Caddell-Burns Manufacturing Co., Inc.
Cambion
Central Technologies
Coil Specialty Company
Coilcraft
Coiltech Inc.
Coin Electronics.Co.,Ltd
Communication Coil Inc.
CTM Magnetics
EK Magnetics
Excel Cell Electronic (USA) Corp.
Frontier Electronics
Goguen Industries Inc.
I-TECH CORP.
IET Labs, Inc.
Jantek Electronics Co., Ltd
KOA Speer Electronics, Inc.
LCR Electronics, Inc.
Magnetic Circuit Elements
Minntronix, Inc
Prem Magnetics, Inc.
Raycom Electronics, Inc.
Renco Electronics, Inc.
Shogyo Int'l Corp.
Sigma Electronics Inc
Sprague-Goodman Electronics, Inc.
Standex Electronics Inc.
Tabtronics Incorporated
Thomas Magnetix
Thordarson Inc.
Thordarson Meissner Incorporated
Tranex Inc
Triad Magnetics (formerly Magnetek)
Ventronics, Inc.
Vishay Intertechnology
Vitec Electronics Corp.
West Coast Magnetics
Wirebenders, Inc.
World Power Components
World Products Inc.
Fixed and programmable amplifiers - Frequency Devices

 

Books
Electrician's Technical Reference: Variable Frequency Drives
Robert Carrow

Excerpt - page 25: "... when long cable runs are in place between electric components. Inductors Variable-frequency drives are basically made up of many electric components, eventually ..."
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Electronic Variable Speed Drives
Michael Brumbach

Excerpt - page 116: "... a higher average output current to the DC bus. The variable DC current is fed to the large inductor in the DC bus section. This inductor provides a constant ..."
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A variable self and mutual inductor, (Bulletin of the Bureau of Standards) (Bulletin of the Bureau of Standards)
Herbert Barton Brooks

State Variables for Engineers
Paul M. DeRusso, Rob J. Roy, Charles M. Close, and Alan A. Desrochers

Excerpt - page 38: "... equations for a general time-invariant linear network consisting of resistors, inductors, and capacitors. Without loss of generality, the network can be represented as in Fig. 2.3-2a. Define the state variables as x,, x2, . . ., x. = voltages across ..."
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Power Electronics and Variable Frequency Drives: Technology and Applications
Bimal K. Bose

The Art of Electronics
Paul Horowitz and Winfield Hill

Excerpt - page 58: "... for user tuning. Figure 1.105 shows the symbol for a variable capacitor. Diodes operated with applied ... (AFC), modulators, and parametric amplifiers. Inductors Variable inductors are usually made by arranging to move a ..."
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System Structure and Control 2001 (2-volume set) (IFAC Proceedings Volumes)
P. Horacek

Excerpt - page 221: "... where x1(0) is the unknown initial state of the normalized inductor current variable x1. The sliding motions exist on S whenever the regulated ..."
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Teach Yourself Electricity and Electronics, Fourth Edition (Teach Yourself)
Stan Gibilisco

Excerpt - page 279: "... 0.0253/20.7 = 0.00122  1220 pF In practical circuits, variable inductors and/or variable capacitors are often placed in tuned circuits, so ..."
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Physics: Principles with Applications (5th Edition)
Douglas C. Giancoli

Excerpt - page 679: "... 108 s-')2(4.0 X 10-' H) Of course, the capacitor or inductor is variable, so other stations can be selected too. The various regions ..."
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Fundamentals of Physics
David Halliday, Robert Resnick, and Jearl Walker

Excerpt - page 858: "... the stage lights in B a theater consists of a variable inductor L (whose inductance To energy is adjustable between zero and ..."
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College Physics
Alan Giambattista, Betty McCarthy Richardson, and Robert C. Richardson

Excerpt - page 782: "... stored in the capacitor and magnetic energy stored in the inductor. The resistor in the RLC ... a 0.50-mH inductor, and a variable capacitor connected in series. Suppose the capacitor is adjusted to ..."
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Fundamentals of Physics
David Halliday, Robert Resnick, and Jearl Walker

Excerpt - page 858: "... stage lights in t I; a theater consists of a variable inductor L (whose inductance To energy is adjustable between zero and ..."
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Electronics For Dummies
Gordon McComb and Earl Boysen

Excerpt - page 110: "... Chapter 4. You can often find the value of larger inductors printed directly on the components. ... can be either fixed or variable. With both types, a slender wire winds around an insulating ..."
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Principles of Avionics, Third Edition
Albert Helfrick

Excerpt - page 243: "... tuners for many years. There are problems with the roller inductor and variable capacitor. The capacitor is exposed to ambient air; when air ..."
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Modern Digital and Analog Communication Systems (The Oxford Series in Electrical and Computer Engineering)
B. P. Lathi

Excerpt - page 232: "... (also wound around the same core). This results in a variable inductor whose inductance is proportional to the current in the second ..."
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Teach Yourself Electricity and Electronics
Stan Gibilisco

Excerpt - page 321: "... Resonant devices 321 In practical circuits, variable inductors and/or variable capacitors are often placed in tuned circuits, so ..."
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Practical Antenna Handbook
Joseph J. Carr

Excerpt - page 504: "... thus be unusable. This problem is solved by making the inductor variable so that slightly different inductance values can be selected at ..."
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The Electronics of Radio
David Rutledge

Excerpt - page 104: "... band-stop filter, the values for the series capacitances and shunt inductors are calculated like the ones ... 15-/ H inductor and a variable capacitor that was adjusted for resonance at 7 MHz. This ..."
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Old Time Radios! Restoration and Repair
Joseph J. Carr

Excerpt - page 59: "... antenna-ground circuit. Even though most radio tuners use a fixed inductor and a variable capacitor, which is ganged to the tuning knob on the ..."
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Beginner's Guide to Reading Schematics
Robert J. Traister and Anna L. Lisk

Excerpt - page 33: "... continuously adjustable air-wound coil. 3-17 Schematic symbols for a continuously variable inductor. Fixed 3-18 Fixed, tapped, and adjustable air-wound coils. Not all ..."
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Fundamentals of Physics, Volume 2 (Chapters 21- 44)
David Halliday, Robert Resnick, and Jearl Walker

Excerpt - page 272: "... the stage lights in H a theater consists of a variable inductor 1. (whose inductance I o cneigN is adjustable between zero ..."
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Fundamentals of Physics, Part 3 (Chapters 21-32)
David Halliday, Robert Resnick, and Jearl Walker

Excerpt - page 137: "... the stage lights in I; a theater consists of a variable inductor L (whose inductance F o clic] g% is adjustable between ..."
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Exercise Workbook for Advanced Autocad 2006: With 30-day Trial Version on Cd-rom
Cheryl Shrock

Excerpt - page 17: "... I-- .15 RESISTOR (2W) LAYER = COMPONENTS ELECT-6 INDUCTOR - VARIABLE ..."
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Welding Essentials: Questions & Answers (Expanded Edition)
William L., Jr. Galvery, Frank M. Marlow, and Pamela Tallman

Excerpt - page 324: "... of the arc and reduce spatter. .,-Laminated Core Figure 13-13. Inductor and its electrical symbol. What is a variable inductor and what does it do? Variable inductors are made ..."
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Implementing 802.11, 802.16, and 802.20 Wireless Networks: Planning, Troubleshooting, and Operations (Communications Engineering)
Ron Olexa

Excerpt - page 33: "... in an oscillator , and by making the capacitor or inductor variable, some degree of tuning, or change in the resonant frequency ..."
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Fundamentals of Electrical Engineering (Oxford Series in Electrical and Computer Engineering)
Leonard S. Bobrow

Excerpt - page 296: "... and consider yet another network function for the same input variable. This time, suppose that the output variable is the inductor current I. Since the impedance loading the voltage source is ..."
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Fundamentals of Signals and Systems: A Building Block Approach
Philip D. Cha and John I. Molinder

Excerpt - page 315: "... radio. The antenna on the left is attached to an inductor and a variable capacitor, which form a band-pass filter. By tuning the value ..."
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Introduction to Electronics 4E
Earl Gates

Excerpt - page 107: "... 4. What letter is used to represent inductance? t0-2 luduclors Inductors are devices designed to have ... can also be fixed or variable. Figure 10-2 shows the symbol for a variable inductor. Variable ..."
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The Arrl Antenna Book (19th Ed./Bk&CD-ROM)
R. Dean Straw

Excerpt - page 567: "... 119 W. Of this, 98 W ends up in the inductor, which must be able to ... large output capacitor. (The output variable capacitor has a maximum capacitance of approximately 400 pF, including ..."
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Encyclopedia of Electronic Circuits, Volume 7
Rudolf F. Graf and William Sheets

Excerpt - page 1007: "... the tuner's 5042 output. The IF amplifier is tuned by variable inductor L1 and capacitor C1, and its gain is controlled by ..."
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Aviation Maintenance Technician Series: Airframe, Vol. 2--Systems
Dale Crane

Excerpt - page 85: "... capacitor Fixed, electrolytic capacitor Variable capacitor Inductors Air-core inductor Iron-core inductor Variable inductor Autotransformer A~~~L Iron-core transformer i AL Air-core transformer AIRCRAFT ..."
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Air Conditioning and Refrigeration Repair
Roger A. Fischer

Excerpt - page 128: "... = MOTOR PROTECTOR T = TIMER _a---,O,- SWITCH, SINGLE-POLE FIXED INDUCTOR OR SOLENOID COIL VARIABLE INDUCTOR -O 0- -T RELAY CONTACTS, NORMALLY OPEN RELAY CONTACTS, ..."
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Volume 2, Chapters 22-45, Fundamentals of Physics, 6th Edition
David Halliday, Robert Resnick, David Halliday, and Robert Resnick

Excerpt - page 296: "... dim the stage lights in a theater consists of a variable inductor L (whose inductance is ad- t justable between zero ..."
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Emc & the Printed Circuit Board: Design, Theory, & Layout Made Simple
Mark I. Montrose

Excerpt - page 128: "... Resonance (Antiresonant Circuit) Practical resonant circuits generally consist of an inductor and variable capacitor in parallel. Since the inductor will possess some resistance, ..."
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Exercise Workbook for Advanced AutoCAD 2004 (AutoCAD Exercise Workbooks)
Cheryl Shrock

Excerpt - Back Matter: "... = COMPONENTS .10 1 r .05 -I .22 INDUCTOR - VARIABLE 20 10 I I~ ~- T/ T .10 .05- I ..."
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Physics, Volume 2
David Halliday, Robert Resnick, and Kenneth S. Krane

Excerpt - page 293: "... the rate at which energy is being stored in the inductor, and (d) the rate at ... a theater consists of a variable inductor L connected in series with the lightbulb B as ..."
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Electronic Filters, Amplifiers & Oscillators - Frequency Devices
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Electronic Filters, Amplifiers & Oscillators - Frequency Devices
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