US3898601A - Core - Google Patents

Core Download PDF

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Publication number
US3898601A
US3898601A US381902A US38190273A US3898601A US 3898601 A US3898601 A US 3898601A US 381902 A US381902 A US 381902A US 38190273 A US38190273 A US 38190273A US 3898601 A US3898601 A US 3898601A
Authority
US
United States
Prior art keywords
integral
magnetizable
slug
aperture
back face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US381902A
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English (en)
Inventor
Gerhard Meindl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3898601A publication Critical patent/US3898601A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core

Definitions

  • ABSTRACT A core for an inductance coil adapted to provide a variable inductance for inductance correction or the like.
  • the core utilizes centrally located sleeve comprised of non-magnetizable, polymeric material threaded to receive a matingly threaded cylindrical core adjusting member.
  • adjustable inductance coil cores for inductance coils have been fitted with a variety of means for varying somewhat the inductance value associated with that core when wound with wire and duly mounted suitably in some sort of electrical circuit for use so as to permit an adjustment or a correction of such inductance value to fit the so wound coil properly into such an electrical circuit.
  • One class of such adjustable inductance coil cores has employed, for example, a sleeve with threaded inside walls which is glued into a central bore formed in the core.
  • a cylindrical adjusting member with outside walls matingly threaded engages the sleeve.
  • Such class of adjustable inductance coil cores suffer from several disadvantages.
  • the glue used can adversely affect the electrical properties of the product coil.
  • the sleeve used is difficult to locate and position properly in the core, so that inducting correction occurs unfavorably.
  • the sleeves heretofore used commonly had excessively high linear coefficients of thermal expansion which not only could harm the core structure in use as equipment undergoes thermal cycling during on/off operations, but also could make achievement of stable inductance valves difficult if not impossible to achieve in a product coil.
  • the present invention relates to a core for inductance coils which is adopted to overcome such disadvantages of prior art inductance coil cores and to provide the capability of making simple, accurate, stable adjustments or corrections the inductance of a product coil made therewith.
  • An object is to provide an inductance coil core containing a centrally located adjustable sleeve which is mounted in the core without the use of glue.
  • Another object is to provide in such a core an adjustable sleeve which is suitably located and positioned in the core.
  • Another object is to provide in such a core such an adjustable sleeve which has a suitable low linear coefficient of thermal expansion relative to the main core body.
  • FIG. I is a top plan view of one embodiment of an inductance coil core of the present invention.
  • FIG. 2 is a vertical sectional view taken along the line 2-2 of FIG. 1.
  • Core assembly incorporates a plate member 1 which has a generally circular perimeter 9 and also a front face 7 and a back face 8 in generally spaced, parallel relationship to one another.
  • An aperture 2 is defined centrally therein and extends trans versely'therethrough.
  • a core assembly of this invention may contain a plurality of apertures.
  • An integral, cylindrical collar extends from such back face 8 circumferentially about such aperture 2, in
  • core assembly 10 For purposes of winding with wire (not shown) to fabricate an inductance coil, core assembly 10 is provided with at least two circumferentially, preferably equally, spaced, integral feet 5 extending from such back face 8 adjacent the perimeter 9 thereof.
  • the side walls 20 and 11 of such feet 5 are in radially spaced, radially generally parallel relationship to the sidewalls l2 and 13 of such collar 4.
  • a sleeve 3 is mounted in aperture 2 so that the circumferential outside walls 15 of sleeve 3 are in face-toface abuting engagement with the side walls 13 of aperture 2 in the region of plate member 1.
  • I rnagnetizable material preferably a ferrite.
  • ferrite ceramic bodies are usually formed by first shaping, as by dry pressing, a ferrite powder composition followed by sintering at final temperatures rangingfrom about 1200 to 1400C. Usually some form of surface finishing, such as grinding, is used to achieve close mechanical tolerances. Magnetically soft ferrites (Mn Zn and Ni Zn ferrites) are preferred for inductor cores.
  • Sleeve 3 is comprised of a plastic material which is substantially non-magnetizable, such as an organic polymer.
  • sleeve 13 is formed of a composition which has a linear thermal coefficient of expansion which falls in the range from about 1 to 45 X lO' /C. when such integral combination is bound of ferrite.
  • the sleeve 3 is conveniently formed of a thermoplastic of thermosetting organic polymeric material such as polyester, expoxide, silicone, phenol, polysulfone, polycarbonate, polyacetal, polyoxymethelene and the like.
  • such organic polymeric material may be filled with a filler material such as a ferrite powder, a carbonyl iron powder, or the like, Typical filling rates range from about 60 to parts by weight of filler per parts by weight of organic polymeric material
  • Sleeve 3 can be formed in the core assembly by any convenient procedure, including injection molding, casting or the like using any convenient filler if desired, so long as the desired product sleeve properties are obtained.
  • Sleeve 3 is inset directly into aperture 2 without adhesive by any convenient procedure, for example, by press fitting, injection pressing, injection molding or the like, as those skilled in the art will readily appreciate.
  • a sleeve 3 so combined into the aperture 2 eliminates many disadvantages occurring in the prior art core assemblies owing to deep or eccentric insertion and glueing of a threaded member into such an aperture 2.
  • undesirable variations in electrical values of a product induction coil made with a core assembly 10 of this invention can be avoided by using a sleeve -3- which is injection pressed into a preformed integral combination of plate member 1, collar 4, and feet 5 by preheating such integral combination to a temperature in the range from about 100 to 300C.
  • cohesion between a sleeve -3- and such an integral combination be greater than about 3 kp without the use of any adhesive.
  • said organic polymeric material is preferably epoxide and the injection molding is carried out in a temperature in the range from about 140 to 300C.
  • an organic polymeric material (most preferably the epoxide) which is filled with a powdered material selected from the group consisting of ferrite and carbonyl iron and which has a linear coefficient of thermal expansion in the range from about 1 to 45 X "/C.
  • the powder size range associated with such a powder preferably ranges from about 50 to 300 microns.
  • the magnetizable material is a ferrite, as indicated above.
  • a core assembly for an inductance coil comprising:
  • said plate member together with said integral collar and said integral feet being comprised of magnetizable material
  • G a dispersion of a powdered material selected from the group consisting of ferrite and carbonyl iron being present throughout the polymeric material to "render said slug magnetizable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US381902A 1972-07-27 1973-07-23 Core Expired - Lifetime US3898601A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2236994A DE2236994C3 (de) 1972-07-27 1972-07-27 Induktivitätsabgleichbare Spule und Verfahren zur Herstellung einer Gewindehul se fur diese Spule

Publications (1)

Publication Number Publication Date
US3898601A true US3898601A (en) 1975-08-05

Family

ID=5851928

Family Applications (1)

Application Number Title Priority Date Filing Date
US381902A Expired - Lifetime US3898601A (en) 1972-07-27 1973-07-23 Core

Country Status (5)

Country Link
US (1) US3898601A (enrdf_load_stackoverflow)
JP (1) JPS5318269B2 (enrdf_load_stackoverflow)
DE (1) DE2236994C3 (enrdf_load_stackoverflow)
FR (1) FR2195043B1 (enrdf_load_stackoverflow)
IT (1) IT998279B (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264683A (en) * 1978-07-26 1981-04-28 Permacoraltair, Inc. Metallic inductor cores
USD264959S (en) 1979-01-25 1982-06-15 Tdk Electronics Co. Ltd. Transformer core member
USD537778S1 (en) * 2005-05-09 2007-03-06 Tdk Corporation Ferrite magnetic core
USD539220S1 (en) * 2005-03-07 2007-03-27 Tdk Corporation Ferrite magnetic core
EP2058826A1 (en) * 2005-05-25 2009-05-13 Sumida Corporation Magnetic element
USD613245S1 (en) * 2009-05-29 2010-04-06 Seiden Mfg. Co., Ltd. Core for a high-frequency three-phase transformer
USD629749S1 (en) * 2009-11-19 2010-12-28 Tdk Corporation Toroidal core cover
USD647848S1 (en) * 2011-04-11 2011-11-01 Delta Electronics, Inc. Core
WO2012123647A1 (fr) * 2011-03-15 2012-09-20 Crouzet Automatismes Capteur inductif de proximite et procede de montage dudit capteur
USD669854S1 (en) * 2010-03-26 2012-10-30 Tdk Corporation Core for electronic component
USD800061S1 (en) * 2014-08-26 2017-10-17 Tokuden Co., Ltd. Transformer
USD906245S1 (en) * 2019-08-30 2020-12-29 Lite-On Electronics (Guangzhou) Limited Ferrite core
USD906246S1 (en) * 2019-08-30 2020-12-29 Lite-On Electronics (Guangzhou) Limited Ferrite core
USD912624S1 (en) * 2019-08-30 2021-03-09 Lite-On Electronics (Guangzhou) Limited Ferrite core
USD935407S1 (en) * 2019-12-27 2021-11-09 Sumida Corporation Core

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2457860B2 (de) * 1974-12-06 1977-11-03 Siemens AG, 1000 Berlin und 8000 München Induktivitaetsabgleichbare elektrische spule
DE2856669A1 (de) * 1978-12-29 1980-07-03 Siemens Ag Induktivitaetsabgleichbare elektrische spule, insbesondere speicherdrossel

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786983A (en) * 1953-11-12 1957-03-26 Aladdin Ind Inc High-voltage transformer
US3162829A (en) * 1958-11-14 1964-12-22 Philips Corp Ferromagnetic pot-core assembles
US3262079A (en) * 1963-07-05 1966-07-19 Int Standard Electric Corp Adjustable inductor
US3471815A (en) * 1968-01-04 1969-10-07 Bell Telephone Labor Inc Temperature compensating inductor and circuit
US3480896A (en) * 1967-11-01 1969-11-25 Components Corp Adjustable inductor
US3671759A (en) * 1970-09-02 1972-06-20 Northern Electric Co Magnetic sensor
US3743853A (en) * 1972-01-10 1973-07-03 Electro Corp America Adjustable proximity sensor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE507196A (enrdf_load_stackoverflow) *
GB1035378A (en) * 1964-12-04 1966-07-06 Standard Telephones Cables Ltd Improvements in or relating to magnetic core assemblies

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786983A (en) * 1953-11-12 1957-03-26 Aladdin Ind Inc High-voltage transformer
US3162829A (en) * 1958-11-14 1964-12-22 Philips Corp Ferromagnetic pot-core assembles
US3262079A (en) * 1963-07-05 1966-07-19 Int Standard Electric Corp Adjustable inductor
US3480896A (en) * 1967-11-01 1969-11-25 Components Corp Adjustable inductor
US3471815A (en) * 1968-01-04 1969-10-07 Bell Telephone Labor Inc Temperature compensating inductor and circuit
US3671759A (en) * 1970-09-02 1972-06-20 Northern Electric Co Magnetic sensor
US3743853A (en) * 1972-01-10 1973-07-03 Electro Corp America Adjustable proximity sensor

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264683A (en) * 1978-07-26 1981-04-28 Permacoraltair, Inc. Metallic inductor cores
USD264959S (en) 1979-01-25 1982-06-15 Tdk Electronics Co. Ltd. Transformer core member
USD539220S1 (en) * 2005-03-07 2007-03-27 Tdk Corporation Ferrite magnetic core
USD537778S1 (en) * 2005-05-09 2007-03-06 Tdk Corporation Ferrite magnetic core
EP2058826A1 (en) * 2005-05-25 2009-05-13 Sumida Corporation Magnetic element
US20090195345A1 (en) * 2005-05-25 2009-08-06 Sumida Corporation Magnetic element
US7893807B2 (en) 2005-05-25 2011-02-22 Sumida Corporation Magnetic element
USD613245S1 (en) * 2009-05-29 2010-04-06 Seiden Mfg. Co., Ltd. Core for a high-frequency three-phase transformer
USD629749S1 (en) * 2009-11-19 2010-12-28 Tdk Corporation Toroidal core cover
USD669854S1 (en) * 2010-03-26 2012-10-30 Tdk Corporation Core for electronic component
USD682208S1 (en) 2010-03-26 2013-05-14 Tdk Corporation Core for electronic component
WO2012123647A1 (fr) * 2011-03-15 2012-09-20 Crouzet Automatismes Capteur inductif de proximite et procede de montage dudit capteur
FR2972795A1 (fr) * 2011-03-15 2012-09-21 Crouzet Automatismes Capteur inductif de proximite et procede de montage dudit capteur
US20140002061A1 (en) * 2011-03-15 2014-01-02 Crouzet Automatismes Inductive proximity sensor and method for fitting said sensor
US9175941B2 (en) * 2011-03-15 2015-11-03 Crouzet Automatismes Inductive proximity sensor and method for fitting said sensor
USD647848S1 (en) * 2011-04-11 2011-11-01 Delta Electronics, Inc. Core
USD800061S1 (en) * 2014-08-26 2017-10-17 Tokuden Co., Ltd. Transformer
USD906245S1 (en) * 2019-08-30 2020-12-29 Lite-On Electronics (Guangzhou) Limited Ferrite core
USD906246S1 (en) * 2019-08-30 2020-12-29 Lite-On Electronics (Guangzhou) Limited Ferrite core
USD912624S1 (en) * 2019-08-30 2021-03-09 Lite-On Electronics (Guangzhou) Limited Ferrite core
USD926134S1 (en) 2019-08-30 2021-07-27 Lite-On Electronics (Guangzhou) Limited Ferrite core
USD935407S1 (en) * 2019-12-27 2021-11-09 Sumida Corporation Core

Also Published As

Publication number Publication date
DE2236994A1 (de) 1974-02-07
IT998279B (it) 1976-01-20
DE2236994B2 (de) 1976-09-23
JPS5318269B2 (enrdf_load_stackoverflow) 1978-06-14
JPS4958354A (enrdf_load_stackoverflow) 1974-06-06
FR2195043A1 (enrdf_load_stackoverflow) 1974-03-01
DE2236994C3 (de) 1978-09-28
FR2195043B1 (enrdf_load_stackoverflow) 1979-01-26

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