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→‎Coaxial Shielding: None of these references refer to an inductor wound of shielded wire, just an ordinary inductor
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{{merge to|Inductor|discuss=Talk:Inductor (shielded)|date=December 2017}}
{{merge to|Inductor|discuss=Talk:Inductor (shielded)|date=December 2017}}
{{Expert needed|physics|ex2=electrical engineering|reason=The article contains primarily meaningless gibberish and technical nonsense camouflaged with unrelated citations.|date=December 2017}}
{{Technical|date=December 2017}}
{{Infobox electronic component
{{Infobox electronic component
|component= Ferrite Shielded Inductor
|component= Ferrite Shielded Inductor
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}}
{{For|Inductor|Inductor}}
{{For|Inductor|Inductor}}
⚫
Regardless of the shape given to a piece of wire, be it straight or coiled back upon itself, a wire which carries current exhibits [[Faraday's Law of Induction]] in which the applied voltage induces a reverse voltage known as [[back EMF]]. This law allows for ignoring the various shapes of wire whenever making broad generalities about the behavior of that wire undergoing '''inductor shielding''' or not.
'''Shielded Inductors''' may be embedded{{efn|{{cite web|title=Ferrite Bead Inductors|url=http://www.radio-electronics.com/info/data/inductors/ferrite-bead-inductors.php|website=Radio-Electronics.com|accessdate=27 December 2017}}}}{{failed verification|date=December 2017}} in [[ferrite]] or encased in a [[Coaxial cable|coaxial sheath]]{{efn|{{cite book
| last = Carr
| first = Joseph J.
| title = Microwave & Wireless Communications Technology
| publisher = Newnes
| year = 1997
| location = USA
| pages = 46–47
| url = https://books.google.com/books?id=1j1E541LKVoC&pg=PA46&dq=%22parallel+line%22+%22coaxial+cable%22+stripline+waveguide
| doi =
| id =
| isbn = 0750697075}}}}{{failed verification|date=December 2017}}{{efn|{{cite book
| last = Raisanen
| first = Antti V.
|author2=Arto Lehto
| title = Radio Engineering for Wireless Communication and Sensor Applications
| publisher = Artech House
| year = 2003
| location =
| pages = 35–37
| url = https://books.google.com/books?id=m8Dgkvf84xoC&pg=PA35
| doi =
| id =
| isbn = 1580536697}}}}{{failed verification|date=December 2017}} (behaving like a [[transmission line]]){{efn|{{cite book
| last = Guru
| first = Bhag Singh
|author2=Hüseyin R. Hızıroğlu
| title = Electromagnetic Field Theory Fundamentals, 2nd Ed.
| publisher = Cambridge Univ. Press
| year = 2004
| location =
| pages = 422–423
| url = https://books.google.com/books?id=qzNdDtZUPXMC&pg=PA9&dq=%22transmission+line%22+uniform#v=onepage&q=%22transmission%20line%22%20uniform&f=false
| doi =
| id =
| isbn = 1139451928}}}}{{failed verification|date=December 2017}} grounded directly to Earth or to high current return<ref>[https://electronics.stackexchange.com/questions/108776/common-vs-ground terminology - Common vs. ground - Electrical Engineering Stack Exchange]</ref> (chassis Earth or common ground).{{synthesis-inline|date=December 2017}}

⚫
Regardless of the shape given to a piece of wire, be it straight or coiled back upon itself, a wire which carries current exhibits [[Faraday's Law of Induction]] in which the applied voltage induces a reverse voltage known as [[back EMF]]. This law allows for ignoring the various shapes of wire whenever making broad generalities about the behavior of that wire undergoing shielding or not.


==Ferrite Shielding==
==Ferrite Shielding==
{{For|Electromagnetically Shielded, Ferrite Inductor or Coaxial Cable|Sheath current filter}}
{{For|[[Electromagnetic shielding|Electromagnetically Shielded]], [[Ferrite]] Inductor or [[Coaxial Cable]]|Sheath current filter}}
For inductors with a [[virtual ground]], see below.


==Coaxial Shielding==
==Coaxial Shielding==
[[File:Demonstration of bypass filter.jpg|thumb|left|Here is a dynamic illustration of how a bypass filter alters the behavior of an inductor [[List of free electronics circuit simulators|simulated]] in [[LTspice|LTSpice]]. The capacitor in this circuit is grounded to Earth illustrating a non-direct, or virtual, ground for this inductor.]]
If{{efn|{{citation |last=Chua |first=L. O. |year=1971 |title=Memristor—The Missing Circuit Element |journal=IEEE Transactions on Circuit Theory |volume=CT-18 |issue=5 |pages=507–519 |doi=10.1109/TCT.1971.1083337 |postscript=Memristors are an example of theory getting ahead of technology. }}}}{{failed verification|date=December 2017}} the insulation of an inductor is converted into the [[Dielectric|dielectric]] of a capacitor by covering the insulator with a thin metallic film, and this metallic film is grounded to the Earth, then{{efn|{{citation |last=Strukov |first=D. B. |last2=Snider |first2=G. S. |last3=Stewart|first3=D. R. |last4=Williams |first4=R. S. |year=2008 |title=The missing memristor found |url=http://www.nature.com/nature/journal/v453/n7191/full/nature06932.html |journal=[[Nature (journal)|Nature]] |volume=453 |issue=7191 |pages=80–83 |doi=10.1038/nature06932 |pmid=18451858 |bibcode=2008Natur.453...80S }}}}{{failed verification|date=December 2017}} the [[Electromagnetic compatibility#Coupling mechanisms|capacitance of the coil will be increased across its insulator]] along with its accumulation of potential with reference to ground. This provides for [[Electromagnetic shielding|shielding the inductor]]<ref>[https://www.webcitation.org/62gSRsABm?url=http://www.ieee.li/pdf/viewgraphs/minimizing_crosstalk_wiring_cabling.pdf Minimizing Crosstalk in Wiring and Cabling]</ref> against immediate [[Crosstalk|electromagnetic loss]]<ref>Based on the "interference" entry of ''The Concise Oxford English Dictionary'', 11th edition, online</ref>{{failed verification|date=December 2017}}<ref>[https://web.archive.org/web/20170621152156/http://download.intel.com/education/highered/signal/ELCT762/class19_Crosstalk_overview.ppt Educational slideshow on capacitive and inductive crosstalk]</ref>{{failed verification|date=December 2017}} temporarily boosting the storage of its back EMF<ref>[http://www.altera.com/literature/wp/wp_sgnlntgry.pdf Basic Principles of Signal Integrity]</ref> within its insulator for [[Electromagnetic compatibility#Coupling mechanisms|applications that require it]]<ref>[http://www.smar.com/en/technical-article/emi-electronagnetic-interference-in-industrial-instalation-and-much-more EMI – Electronagnetic Interference in industrial instalation and much more... - SMAR - Industrial Automation]</ref>{{failed verification|date=December 2017}} if the coil is of sufficient resistance resulting from an excessive length of thousands of feet.{{OR|date=December 2017}}
If the insulation of an inductor is converted into the [[Dielectric|dielectric]] of a capacitor by covering the insulator with a thin metallic film, and this metallic film is [[virtual ground|grounded to the Earth]], then the [[Electromagnetic compatibility#Coupling mechanisms|capacitance of the coil will be increased across its insulator]] along with its accumulation of potential with reference to ground. This provides for [[Electromagnetic shielding|shielding the inductor]] against [[Crosstalk|electromagnetic loss]] due to [[Interference (wave propagation)|interference]]<ref>[https://www.webcitation.org/62gSRsABm?url=http://www.ieee.li/pdf/viewgraphs/minimizing_crosstalk_wiring_cabling.pdf Minimizing Crosstalk in Wiring and Cabling]</ref><ref>{{cite web|title=Educational slideshow on capacitive and inductive crosstalk|url=http://download.intel.com/education/highered/signal/ELCT762/class19_Crosstalk_overview.ppt|publisher=Intel|accessdate=29 December 2017|archiveurl=https://web.archive.org/web/20170621152156/http://download.intel.com/education/highered/signal/ELCT762/class19_Crosstalk_overview.ppt|archivedate=21 June 2017|pages=29-30|language=English|format=Power Point|quote=If the dielectric is homogeneous (I.e., buried microstrip or stripline) , the effective dielectric constant will not change because the electric fields will never fringe through air}}</ref> temporarily boosting the storage of its back EMF<ref>[http://www.altera.com/literature/wp/wp_sgnlntgry.pdf Basic Principles of Signal Integrity]</ref> within its insulator.


Coaxial shielding [[Decoupling capacitor#Decoupling|decouples]] voltage buildup in a coil by the use of a bypass filter and stores it in a capacitor element as a reserve of current.<ref>[http://www.seattlerobotics.org/encoder/jun97/basics.html The Basics - Bypass Capacitors]</ref> This may be fulfilled with either a capacitor or the insulation on a coiled wire of sufficient length.<ref name="Quabbin">[https://www.quabbin.com/tech-briefs/why-cable-capacitance-important-electronic-applications Why is Cable Capacitance Important for Electronic Applications?]</ref>{{failed verification|date=December 2017}}{{synthesis-inline|date=December 2017}}
Coaxial shielding [[Decoupling capacitor#Decoupling|decouples]] voltage buildup in a coil by the use of a bypass filter and stores it in a capacitor element as a reserve of current.<ref>[http://www.seattlerobotics.org/encoder/jun97/basics.html The Basics - Bypass Capacitors]</ref>


This will amass more voltage along the surface of the coil especially if a commutator is allowed to ''briefly'' self-short the coil immediately before another pulse of DC is sent to the coil.<ref name="Newman">{{cite web|title=''The Energy Machine of Joseph Newman'' (1986)|url=https://openlibrary.org/works/OL16969270W/The_energy_machine_of_Joseph_Newman|website=Open Library review of The energy machine of Joseph Newman|accessdate=27 December 2017}}</ref>{{unreliable source?|date=December 2017}}{{synthesis-inline|date=December 2017}} Not until the current ''catches up'' with the voltage polarity will current flow attain its [[steady-state]].<ref name="back-EMF">[https://forum.allaboutcircuits.com/threads/back-emf-vs-voltage.32383/page-2#post-1216812 LTSpice simulation of back EMF]</ref>{{failed verification|date=December 2017}} This may never happen in massive coils of self-induced resistance.<ref name="Quabbin" />{{failed verification|date=December 2017}}
Not until the current 'catches up' with the voltage polarity of a ''non-sheathed inductor'' will current flow attain its [[steady-state]].<ref name="back-EMF">[https://forum.allaboutcircuits.com/threads/back-emf-vs-voltage.32383/page-2#post-1216812 LTSpice simulation of back EMF]</ref>

A bypass filter connects a voltage source to Earth ground via a decoupling [[capacitor]]. When this concept is applied to a coiled wire, it will enhance the ''[[skin effect]]'' of that wire - namely: the transference of [[forward voltage]] off of the inductor and onto its insulator.{{synthesis-inline|date=December 2017}} This is in contradistinction to the use of [[ferrite beads]] for suppressing [[sheath current]].


==Analogy for Coaxial Shielding==
==Analogy for Coaxial Shielding==
{{For|[[Impedance matching]] of small aerials|Antenna (radio)#Impedance matching}}
[[File:Virtual Ground for an Inductor.jpg|thumb|right|Analogy drawn between Nikola Tesla's apparatus for the utilization of [[radiant energy]] and shielding back EMF in an inductor. This inductor's referenced potential is an Earth ground rather than using a [[floating ground]].]]
This [[Energy harvesting|arrangement]]{{efn|{{cite web|title=Professional Profile of Yen Kheng TAN|url=https://web.archive.org/web/20160307001815/https://www.ece.nus.edu.sg/emdl/yenkheng.htm|website=Archive.org|accessdate=27 December 2017}}}}{{failed verification|date=December 2017}}{{efn|{{cite web|title=EnHANTs project|url=http://enhants.ee.columbia.edu/|website=Columbia University|accessdate=27 December 2017}}}}{{failed verification|date=December 2017}}{{efn|{{cite web|title=The Amazing Ambient Power Module|url=http://rexresearch.com/tate/tate.htm#apm|publisher=Ambient Research|access-date=16 January 2008|first=Joseph|last=Tate|date=1989}}}} is [[Crystal radio|similar]]{{efn|{{cite web|title=Crystal Radios|url=http://www.skywaves.ar88.net/xtal/xtal.htm|publisher=Klase's website|access-date=2010-01-18|first=Al|last=Klase}}}}{{failed verification|date=December 2017}}{{efn|{{cite web|title=Designing a DX crystal set|url=https://web.archive.org/web/20130228082514/http://www.antiquewireless.org/otb/dxxtal.htm|publisher=Antique Wireless Association journal|access-date=2017-12-25|first=Mike|last=Tuggle|date=2003}}}}{{failed verification|date=December 2017}}{{efn|{{cite web|title=Birmingham, Alabama Crystal Radio Group|url=http://crystalradio.us/|publisher=Birmingham Crystal Radio Group, Birmingham, Alabama, US|access-date=2010-01-18|first=Jack|last=Bryant|date=2009}}}}{{failed verification|date=December 2017}} to [[Nikola Tesla]]'s patent ''Apparatus for the Utilization of Radiant Energy''<ref name="Tesla">{{US patent|0685957}} Nikola Tesla, ''Apparatus for the Utilization of Radiant Energy'', 1901 November 5</ref>{{unreliable source?|date=December 2017}} in which an [[Antenna (radio)|aerial's]] connection to ground is broken by a capacitor.{{synthesis-inline|date=December 2017}} The aerial is analogous to an inductor accumulating a difference of voltage between its inlet and its outlet.{{synthesis-inline|date=December 2017}} The copper coil of an inductor represents one plate of a capacitor connected to Tesla's aerial. The insulation of an inductor is the dielectric of Tesla's capacitor. The thin metallic film coating the inductor's insulation represents the opposite plate of Tesla's capacitor connected to Earth ground.


==Analogous to Voltage Source==
==Analogous to Voltage Source==
An inductor is analogous to a voltage source whenever its power is shut down.<ref name="back-EMF" /> This is especially evident whenever an inductor is undergoing high voltage conditions.<ref>[http://www.loneoceans.com/lo_main/labs_01/ignitioncoil/index.htm High Voltage Ignition Coil Experiments] from [http://www.loneoceans.com/ LoneOceans.com]</ref>
An inductor is analogous to a voltage source whenever its power is shut down.<ref name="back-EMF" /> This makes an inductor analogous to the aerial in Tesla's patent,<ref name="Tesla" />{{unreliable source?|date=December 2017}} mentioned above, in need of grounded shielding to temporarily optimize its storage of both forward and reverse voltage.{{synthesis-inline|date=December 2017}} This is especially necessary whenever an inductor is undergoing high voltage conditions<ref>[http://www.loneoceans.com/lo_main/labs_01/ignitioncoil/index.htm High Voltage Ignition Coil Experiments] from [http://www.loneoceans.com/ LoneOceans.com]</ref> such as large inductors of excessive, uncoiled surface area capable of developing large potentials in their insulation<ref name="Newman" /> when they are not grounded directly to Earth.<ref>[http://www.skepticfiles.org/mys4/newman.htm Skeptic Files] - The Energy Machine of Joe Newman Abstracted from an article in the May 1987 issue of Discover Magazine. This is an example of ''the loss of voltage'' whenever a HV coil ''is grounded to Earth'' by the [http://files.ncas.org/ National Bureau of Standards].</ref><ref>{{cite web|title=Report of Tests on Joseph Newman's Device, Introduction|postscript= - quote: '''The National Bureau of Standards provided the resistive load which was connected in parallel with the coil.''' - This is an example of current wanting to take the path of least resistance through a parallel resistive load, bypassing the coil (of greater resistance than their test load) to a significant degree by cleverly shorting said coil to itself and prevent accumulation of HV. ''Nice going, guys!'' Had they used a bypass filter between the coil and a grounded path to Earth, and placed their test load inline with the filter, or - in the alternative - perform their test as Newman advises in his book by wrapping a shorter length of secondary coil around the larger primary coil and placing the test load ''only inline with this secondary and isolated from the primary'', then it's entirely possible that the NBS would have produced more accurate results.|url=http://files.ncas.org/nbsreport/introduction.html|website=NBSIR 86-3405 - Report of Tests on Joseph Newman's Device|accessdate=27 December 2017}}</ref>{{synthesis-inline|date=December 2017}}


==Gallery of Schematic Symbols==
==Gallery of Schematic Symbols==
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==See also==
==See also==
⚫
* [[Power supply]]
* [[Amplifier]]
* [[Amplifier]]
* [[Electronic Symbols]]
* [[Electronic Symbols]]
* [[Ground loop (electricity)]]
* [[Ground loop (electricity)]]
⚫
* [[Power supply]]
* [[Shielded cable]]
* [[Shielded cable]]
* [[Transmission line]]

==Notes==
{{notelist}}


==References==
==References==
{{reflist}}
{{reflist}}


==Suggested Reading==
==Bibliography==
* {{Cite book | last = Basalla | first = George | authorlink = | title = The Evolution of Technology | publisher = Cambridge University Press | year = 1988 | location = UK | page = 44 | url = https://books.google.com/books?id=EBtnG36-1WIC&pg=PA44 | doi = | isbn = 0-521-29681-1 }}
* {{cite web|title=Glossary - Terminology of Inductors|url=http://token.com.tw/inductor-glossay.htm|publisher=Token components|accessdate=29 December 2017|archiveurl=http://studylib.net/doc/18891777/glossary---terminology-of-inductors|archivedate=2010}}
* {{cite web|title=Glossary - Terminology of Inductors|url=http://token.com.tw/inductor-glossay.htm|publisher=Token components|accessdate=29 December 2017|archiveurl=http://studylib.net/doc/18891777/glossary---terminology-of-inductors|archivedate=2010}}
* {{cite web|title=The Ethereal Tesla Pump|url=https://cloud.mail.ru/public/DZkc/xuhvA1ZaZ|first=Nodir|last=D|accessdate=29 December 2017}} Translated by its author into English.
* {{cite web|title=The Ethereal Tesla Pump|url=https://cloud.mail.ru/public/JVAz/XjpXmX6Zi|first=Nodir|last=D|accessdate=29 December 2017}} Written in its original Russian.
* {{cite web|title=The last in vivo interview of Nikola Tesla, in Russian|url=http://realstrannik.com/forum/proekty-i-izobreteniya-nikoly-tesla/120-more-energii-vokrug-nas-n-tesla?start=54|accessdate=29 December 2017}}
* {{cite web|title=The last in vivo interview of Nikola Tesla, translated into English|url=https://translate.googleusercontent.com/translate_c?act=url&depth=1&hl=en&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ru&sp=nmt4&tl=en&u=https://cont.ws/%40oobitiy/433475&usg=ALkJrhjh8cvEPesf5ml5bHS-8mxieUFrTw|accessdate=29 December 2017}}
* {{cite web|title=Keywords of Diagram, in Russian|url=http://realstrannik.com/forum/proekty-i-izobreteniya-nikoly-tesla/120-more-energii-vokrug-nas-n-tesla?start=126|accessdate=29 December 2017}}
* {{cite web|title=Keywords of Diagram, translated into English|url=https://translate.google.com/translate?sl=ru&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Frealstrannik.com%2Fforum%2Fproekty-i-izobreteniya-nikoly-tesla%2F120-more-energii-vokrug-nas-n-tesla%3Fstart%3D126%2372055&edit-text=&act=url|accessdate=29 December 2017}}

==External Links==
* [http://in-natura.ru/ Micro Quantum Physics, in Russian]
* [https://translate.googleusercontent.com/translate_c?act=url&depth=1&hl=en&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ru&sp=nmt4&tl=en&u=http://in-natura.ru/&usg=ALkJrhhZjlB94Kb_75n6Pem4jzEsAw9KUg Micro Quantum Physics, translated into English]


{{DEFAULTSORT:Inductor (shielded)}}
{{DEFAULTSORT:Inductor (shielded)}}

Revision as of 04:33, 30 December 2017

Ferrite Shielded Inductor
TypePassive
Working principle‍Electromagnetic induction
Electronic symbol
File:Inductor embedded in ferrite 76x26.png
Coaxial Shielding
TypePassive
Working principle‍Electromagnetic induction, Capacitance, Ground (electricity)
Electronic symbol
File:Shielded Inductor 76x44.png
Coaxial Shielding with Magnetic Core
TypePassive
Working principle‍Electromagnetic induction, Capacitance, Ground (electricity)
Electronic symbol
File:Shielded Inductor with magnetic core 76x52.png
For Inductor, see Inductor.

Regardless of the shape given to a piece of wire, be it straight or coiled back upon itself, a wire which carries current exhibits Faraday's Law of Induction in which the applied voltage induces a reverse voltage known as back EMF. This law allows for ignoring the various shapes of wire whenever making broad generalities about the behavior of that wire undergoing inductor shielding or not.

Ferrite Shielding

For Electromagnetically Shielded, Ferrite Inductor or Coaxial Cable, see Sheath current filter.

Coaxial Shielding

File:Demonstration of bypass filter.jpg
Here is a dynamic illustration of how a bypass filter alters the behavior of an inductor simulated in LTSpice. The capacitor in this circuit is grounded to Earth illustrating a non-direct, or virtual, ground for this inductor.

If the insulation of an inductor is converted into the dielectric of a capacitor by covering the insulator with a thin metallic film, and this metallic film is grounded to the Earth, then the capacitance of the coil will be increased across its insulator along with its accumulation of potential with reference to ground. This provides for shielding the inductor against electromagnetic loss due to interference[1][2] temporarily boosting the storage of its back EMF[3] within its insulator.

Coaxial shielding decouples voltage buildup in a coil by the use of a bypass filter and stores it in a capacitor element as a reserve of current.[4]

Not until the current 'catches up' with the voltage polarity of a non-sheathed inductor will current flow attain its steady-state.[5]

Analogy for Coaxial Shielding

For Impedance matching of small aerials, see Antenna (radio) § Impedance matching.

Analogous to Voltage Source

An inductor is analogous to a voltage source whenever its power is shut down.[5] This is especially evident whenever an inductor is undergoing high voltage conditions.[6]

See also

References

  1. ^ Minimizing Crosstalk in Wiring and Cabling
  2. ^ "Educational slideshow on capacitive and inductive crosstalk". Intel. pp. 29–30. Archived from the original (Power Point) on 21 June 2017. Retrieved 29 December 2017. If the dielectric is homogeneous (I.e., buried microstrip or stripline) , the effective dielectric constant will not change because the electric fields will never fringe through air
  3. ^ Basic Principles of Signal Integrity
  4. ^ The Basics - Bypass Capacitors
  5. ^ a b LTSpice simulation of back EMF
  6. ^ High Voltage Ignition Coil Experiments from LoneOceans.com

Suggested Reading

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