US2691768A - Coil assembly with variable premagnetization - Google Patents

Coil assembly with variable premagnetization Download PDF

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Publication number
US2691768A
US2691768A US275921A US27592152A US2691768A US 2691768 A US2691768 A US 2691768A US 275921 A US275921 A US 275921A US 27592152 A US27592152 A US 27592152A US 2691768 A US2691768 A US 2691768A
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US
United States
Prior art keywords
core
premagnetization
coil
magnet
coil assembly
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
US275921A
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English (en)
Inventor
Janssen Peter Johanne Hubertus
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2691768A publication Critical patent/US2691768A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/90—Linearisation of ramp; Synchronisation of pulses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias
    • 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

Definitions

  • This invention relates to a coil assembly with variable premagnetization.
  • the main object of the invention is to provide a magnetic coil having a ferromagnetic core and means for providing smooth and accurate control of the premagnetization of the core.
  • the coil assembly main core is formed from
  • a slot 15 is provided on one of the end faces of the support H so that it may be rotated by means of a screw driver.
  • the magnetic field produced by the permanent magnet is is partly closed through the ferromagnetic core 3, resulting in premagnetization of the core 3.
  • the intensity of the premagnetization naturally varies with the spacing between 10 includes a premanent magnet spaced from the the core 3 and the permanent bar magnet i3. It Both the core and the magnet are is obvious that rotating the cylindrical support adapted to be moved relative to each other to II about its longitudinal axis causes the said vary the spacing therebetween. With such an spacing to vary and thus enables the premagneth arrangement, the premagnetization of the core zation of the core 3 to be varied.
  • a rod-like magnet magnet bar l3 are closest to one another (diais arranged parallel to the ferromagnetic core grammatically shown in Fig. 3) the magnetizaof a coil winding and is secured to a cylindrical tion is a maximum, in which case, the core 3 support of non-magnetic material adapted to 29 will generally be saturated.
  • FIG. 2 is an end view of the coil shown in Fig. 1; this figure, a, b, and c designate three positions
  • Fig. 3 is a diagrammatic representation of the 30 Which the magnet l3 o p s in relat on to coil shown in Fig. 1 showing how a smooth cone Core 3 e t pp N F ot sh wn trol of premagnetization of the core is obtained; in Fig. 3) is turned twice in succession through Figs. 4 and 5 are simplified views of the coil the Same angle- AS y e Seen o the figshown in Fig.
  • Fig. 4 Shows hat in t parallel secured in position in a suitable cylindrical bore position the lines of force which emanate from 5 in a housing 1 of non-magnetic t l, g., H the magnet it will enter the core 3 primarily at the ends of the core outside the wound part or A second cylindrical bore 9, adjacent to and coil I.
  • the magnetization is, consequently, subabove the bore 5, extends lengthwise through n i lly on tant i the W n p f th the housing i and is parallel to the bore 5.
  • a core If, however, as shown in Fig.
  • the rod cylindrical support ll of non-magnetic material, I3 is inclined relative to the core 3, part of the e. g., synthetic resin, is journalled in the bore 9 flux will, as shown in the figures, enter the core and is adapted to be rotated within said bore through the winding 1 adjacent those ends of about its longitudinal axis.
  • a rod-like permathe core and magnet which are remote from nent magnet I3 is secured to the support II in each other (at the right of Fig. 5), because at a manner such that it is eccentric with respect this point the distance is less than at the in- 3 volved ends themselves.
  • a coil assembly comprising a housing of non-magnetic material, a coil within said housing, a rod-like core of ferromagnetic material within said coil, a cylindrical member of nonmagnetic material. rotatably supported Within the housing, and a permanent magnet eccentrically secured to said cylindrical member and. extending opposedly parallel to and spaced from said core for varying the spacing between the core and the permanent magnet to thereby alter the premagnetization of said core upon rotation of said cylindrical member.
  • a coil assembly comprising a housing of non-magnetic material, a coil within said housing, a rod-like core of ferromagnetic material 40 within said coil, a cylindrical member of nonmagnetic material arranged parallel to said core within said housing, and a permanent magnet secured to said cylindrical. member and arranged parallel to the axis of the cylindrical member for varying the spacing between the core and the permanent magnet to thereby alter the premagnetization of said core upon rotation of said cylindrical member.
  • A. coil assembly comprising a housing of non-magnetic material, a coil within a portion of said housing, a rod-like core of ferromagnetic material within said coil, a cylindrical member of non-magnetic material journalled within a second portion of said housing and parallel to said coil, and a permanent magnet supported by and arranged parallel to the axis of said cylindrical member for varying the spacing between the core and the permanent magnet to thereby alter the premagnetization of said core upon rotation of said cylindrical member.
  • a call assembly comprising a housing of non-magnetic material, a coil within said. housing, a rod-like core.- of ferromagnetic material having a given length within said coil, acylindrical member oi non-magnetic material journalled in said housing, and a permanent magnet having a length at least equal to said given core length supported by and arranged parallel to the axis of said cylindrical member for varying the; spacing between thecore and the permanent magnet to thereby alter the premagnetization of 'said core upon rotation of said cylindrical member.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Details Of Television Scanning (AREA)
US275921A 1951-04-05 1952-03-11 Coil assembly with variable premagnetization Expired - Lifetime US2691768A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL698458X 1951-04-05

Publications (1)

Publication Number Publication Date
US2691768A true US2691768A (en) 1954-10-12

Family

ID=19808956

Family Applications (1)

Application Number Title Priority Date Filing Date
US275921A Expired - Lifetime US2691768A (en) 1951-04-05 1952-03-11 Coil assembly with variable premagnetization

Country Status (5)

Country Link
US (1) US2691768A (fr)
BE (1) BE510397A (fr)
FR (1) FR1053446A (fr)
GB (1) GB698458A (fr)
NL (1) NL89599C (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822528A (en) * 1954-10-15 1958-02-04 Philips Corp Premagnetized inductive device
DE1031425B (de) * 1954-10-15 1958-06-04 Philips Nv Abgleichbare Spulenanordnung mit vormagnetisiertem Kern
US2944213A (en) * 1954-11-15 1960-07-05 Friedrich M O Foerster Apparatus for non-destructive testing
US3018456A (en) * 1957-07-18 1962-01-23 Westinghouse Electric Corp Switching devices
DE1289096B (de) * 1964-08-11 1969-02-13 Philips Nv Spulenanordnung mit einem saettigbaren Kern, insbesondere Linearitaetsregler fuer Fernsehgeraete

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1896510A (en) * 1930-06-28 1933-02-07 Bell Telephone Labor Inc Adjustable inductance
US2000378A (en) * 1929-07-15 1935-05-07 Thos E Stone Jr Adjusting effective incremental permeability of magnetic circuits
US2503155A (en) * 1948-05-18 1950-04-04 Rca Corp Variable inductance device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2000378A (en) * 1929-07-15 1935-05-07 Thos E Stone Jr Adjusting effective incremental permeability of magnetic circuits
US1896510A (en) * 1930-06-28 1933-02-07 Bell Telephone Labor Inc Adjustable inductance
US2503155A (en) * 1948-05-18 1950-04-04 Rca Corp Variable inductance device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822528A (en) * 1954-10-15 1958-02-04 Philips Corp Premagnetized inductive device
DE1031425B (de) * 1954-10-15 1958-06-04 Philips Nv Abgleichbare Spulenanordnung mit vormagnetisiertem Kern
US2944213A (en) * 1954-11-15 1960-07-05 Friedrich M O Foerster Apparatus for non-destructive testing
US3018456A (en) * 1957-07-18 1962-01-23 Westinghouse Electric Corp Switching devices
DE1289096B (de) * 1964-08-11 1969-02-13 Philips Nv Spulenanordnung mit einem saettigbaren Kern, insbesondere Linearitaetsregler fuer Fernsehgeraete

Also Published As

Publication number Publication date
GB698458A (en) 1953-10-14
FR1053446A (fr) 1954-02-02
BE510397A (fr)
NL89599C (fr)

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