GB708131A - Improvements in devices comprising a magnetic circuit of highly-permeable material - Google Patents

Improvements in devices comprising a magnetic circuit of highly-permeable material

Info

Publication number
GB708131A
GB708131A GB20136/51A GB2013651A GB708131A GB 708131 A GB708131 A GB 708131A GB 20136/51 A GB20136/51 A GB 20136/51A GB 2013651 A GB2013651 A GB 2013651A GB 708131 A GB708131 A GB 708131A
Authority
GB
United Kingdom
Prior art keywords
coercivity
saturation
oersteds
magnetic circuit
magnetization
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
GB20136/51A
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 GB708131A publication Critical patent/GB708131A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Nonlinear Science (AREA)
  • Soft Magnetic Materials (AREA)
  • Magnetic Ceramics (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

708,131. Transformers. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Aug. 27, 1951 [April 23, 1951], No. 20136/51. Class 38(2) A device such as a pulse transformer or a transforriier having DC. magnetization comprises at least one of the A.C. windings 2, 3 surrounding a magnetic circuit of high permeability material 1, in which a constant premagnetizing field is produced by a permanent magnet insert 4 of high resistivity material having a coercivity of at least 750 Oersteds, and a value of retentivity in Gauss of not more than four times the coercivity in Oersteds. This latter material may be of the kind described in Specification 708,127 comprising non-cubic crystals of mixed oxides of iron and at least one of the metals barium, strontium and lead, with in some cases' calcium. So that this material is not operated on an irreversible part of its curve the field strength I H C of disappearance of magnetization should be at least 1.2 times the coercivity B H C . During passage of the pulse in a winding, the flux is reversed in material 1 from saturation in one direction to saturation in the other, and so that the saturable part of the hysteresis curve of the permanent magnetic material 4 is not reached material 1 has a low saturation value, or body 4 is given a considerable leakage field, e.g. by means of a magnetic shunt The high resistivity of material 4 obviates the need for a conductive screen. Specifications 708,121, 708,132, 708,133, 708,134, 708,135, 708,136, 708,137 and 708,140, also are referred to.
GB20136/51A 1951-04-23 1951-08-27 Improvements in devices comprising a magnetic circuit of highly-permeable material Expired GB708131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL311958X 1951-04-23

Publications (1)

Publication Number Publication Date
GB708131A true GB708131A (en) 1954-04-28

Family

ID=19783655

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20136/51A Expired GB708131A (en) 1951-04-23 1951-08-27 Improvements in devices comprising a magnetic circuit of highly-permeable material

Country Status (5)

Country Link
BE (1) BE505463A (en)
CH (1) CH311958A (en)
FR (1) FR1041522A (en)
GB (1) GB708131A (en)
NL (1) NL81702C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1059197B (en) * 1955-06-14 1959-06-11 Licentia Gmbh Write head for magnetic recordings according to the boundary line shift method
DE1108803B (en) * 1957-01-08 1961-06-15 Reich Robert W Electron flash device

Also Published As

Publication number Publication date
CH311958A (en) 1955-12-15
BE505463A (en)
NL81702C (en)
FR1041522A (en) 1953-10-23

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