GB708121A - Improvements in or relating to inductance coils comprising a ferro-magnetic core of highly-permeable ferrite - Google Patents

Improvements in or relating to inductance coils comprising a ferro-magnetic core of highly-permeable ferrite

Info

Publication number
GB708121A
GB708121A GB8991/51A GB899151A GB708121A GB 708121 A GB708121 A GB 708121A GB 8991/51 A GB8991/51 A GB 8991/51A GB 899151 A GB899151 A GB 899151A GB 708121 A GB708121 A GB 708121A
Authority
GB
United Kingdom
Prior art keywords
core
inductance
field
ferro
relating
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
Application number
GB8991/51A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB708121A publication Critical patent/GB708121A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0311—Compounds
    • H01F1/0313—Oxidic compounds
    • H01F1/0315—Ferrites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F29/146—Constructional details

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

708,121. Inductances. PHILIPS ELECTRICAL INDUSTRIES, Ltd. April 17,1951 [April 20, 1950], No. 8991/51. Drawings to Specification. Class 38(2) In an inductance coil for signal frequencies exceeding 10 KE/sec, a ferromagnetic core of ferrite with a loss angle less than 0.06 and a Curie temperature greater than 80‹C is premagnetized by a constant magnetic field of such valve that the inductance of the coil is substantially independent of temperature. This field, which may be produced by a permanent magnet, is preferably at right angles to the field produced within the core by the signals. Both the permeability and the losses of the material are approximately halved. The core dimensions may be chosen so that loss increase from mechanical resonance is avoided. An inductance, may have a core part with a positive temperature coefficient combined with a part with such a value of premagnetization field that it has a negative temperature coefficient, so that the coefficient overall is zero. Specifications 708,127, 708,131, 708,132, 708,133, 708,134 708,135, 708,136, 708,137 and 708,140 are referred to.
GB8991/51A 1950-04-20 1951-04-17 Improvements in or relating to inductance coils comprising a ferro-magnetic core of highly-permeable ferrite Expired GB708121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL708121X 1950-04-20

Publications (1)

Publication Number Publication Date
GB708121A true GB708121A (en) 1954-04-28

Family

ID=19812123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8991/51A Expired GB708121A (en) 1950-04-20 1951-04-17 Improvements in or relating to inductance coils comprising a ferro-magnetic core of highly-permeable ferrite

Country Status (1)

Country Link
GB (1) GB708121A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107658092A (en) * 2016-07-25 2018-02-02 施耐德电气工业公司 FERRITE CORE, current transformer and earth leakage circuit-breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107658092A (en) * 2016-07-25 2018-02-02 施耐德电气工业公司 FERRITE CORE, current transformer and earth leakage circuit-breaker
GB2553908A (en) * 2016-07-25 2018-03-21 Schneider Electric Ind Sas Ferrite core, current mutual inductor and current leakage protection switch
AU2017208249B2 (en) * 2016-07-25 2021-08-05 Schneider Electric Industries Sas Ferrite core, current transformer and leakage protection switch

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