US3835370A - Dampened choke coil - Google Patents

Dampened choke coil Download PDF

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Publication number
US3835370A
US3835370A US00339736A US33973673A US3835370A US 3835370 A US3835370 A US 3835370A US 00339736 A US00339736 A US 00339736A US 33973673 A US33973673 A US 33973673A US 3835370 A US3835370 A US 3835370A
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US
United States
Prior art keywords
coil
tube
resistor
cylindrical member
electrical
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
US00339736A
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English (en)
Inventor
H Kaiserwerth
J Wimmer
R Schaller
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
Original Assignee
Siemens AG
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
Priority claimed from DE19727210297 external-priority patent/DE7210297U/de
Priority claimed from DE19727210330 external-priority patent/DE7210330U/de
Application filed by Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US3835370A publication Critical patent/US3835370A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • the field of art to which this invention pertains is a damped coil structure in which either the coil or the resistor is formed as a tube with the other of the two elements being positioned at the interior of the tube. The coil and the resistor are connected in parallel to form a damped circuit.
  • FIG. 1 shows a coil structure according to the present invention wherein the resistor is formed in theshape of a tube and an electrical coil is positioned at the interior of the tube.
  • FIG. 2 is a graph showing the effect of using a damping resistor on a coil such as that shown in FIG. 1.
  • FIG. 3 is a coil structure also according to the present invention wherein the coil is wound in the form of a tube and a resistor is placed interiorly of the tube and both elements are connected in parallel relation.
  • the present invention relates to a damped electrical coil which has a ferromagnetic core and a winding of wire.
  • Such coils are often used for a wide variety of frequency ranges. It cannot always be assured that the coil will not form a resonance circuit with capacitances which are in the circuit such as parasitic capacitances and the like.
  • the result of such a resonant circuit is current or voltage elevation in an undesirable manner. These undesirable effects, however, do not occur if the Q of the circuit is sufficiently low namely, less than I.
  • a resistor may be connected in parallel with the choke coil which has a value such as the equivalent of the impedance of the coil at the resonant frequency.
  • resistors are undesirable because they are additional components which must be installed and which add to the cost of the unit. Not only is high cost a factor, but insulation of a resistor of this type also utilizes additional space in the assembly.
  • the present invention accomplishes the desired task of finding a damped choke coil which has all the desirable characteristics but which does not have the damaging effects of resonance magnification.
  • the ferromagnetic core is designed as a tube and the resistance is positioned at the interior of the tube.
  • the tube 4 can consist of a ferrite material, carbonyl iron or of suitable sheet metal. It is desirable that in such an arrangement the value of resistance be independent of the frequency of operation.
  • a symmetrical wire or layer resistor may be arranged, and if necessary, attached by a suitable cement.
  • the connecting wires of the resistor form junctions with the connecting wires of the coil.
  • the tube serving as a resistor can consist of ceramic, glass or a ferromagnetic material. It may be provided either inside or outside with a resistance layer. If the resistance layer is provided interiorly on the tube, the unit is left electrically insulated at the outside.
  • the resistor can be a wire resistor or a layer re sistor or a lump type resistor.
  • the ends of the choke winding and the resistor may take place by soldering if both have wire connections or by an electrically conductive glue to bridge the gap between the tube walls and the interior element.
  • the coil may be shielded by a magnetic material and the entire unit may be filled with a compound. By this step, the magnetic field and the self-induction can be increased.
  • such components are desirably insulated with regard to the outside of the unit, for instance, by covering with a hose of insulating material.
  • FIG. 1 shows a sectional view of a coil according to the invention.
  • the core 1 is formed of a magnetic material and on the outer side thereof a winding 2 of copper wire is formed.
  • the ends 7 of the winding 2 are soldered with the outer connecting parts 3.
  • a tube core 4 of insulating material is caused to surround the choke coil, and the tube core is provided with a resistance on the inner surface thereof.
  • the resistance is identified by numeral 5.
  • the electrical connection between the resistance and the connecting wire 3 in FIG. 1 takes place by means of an electrically conductive glue 6 which also closes off the inner space of the tube.
  • the carrier member 4 and the resistance layer 5 thereby form the electrical resistor identified by the numeral 8.
  • FIG. 2 shows a logarithmic illustration of the dependency of the alternating current resistance Z of the structure according to FIG. 1 on the frequency f.
  • the winding has an inductivity of-L p.ul-I.
  • the resistance layer has a resistance value of R 800 ohms. To achieve these curves, the device was measured with an additionalcapacitor having a capacity of IOpF which was connected in series with the unit in order to simulate scattered capacity in a typical circuit.
  • the curve (a) shows the results without a resistor. Definite resonance points A and self resonance B are recognized.
  • the curve (b) shows the results with the resistor added as shown in FIG. 1. It is noticed that the definite resonance points disappeared. In particular, the series resonance A strongly decreases.
  • FIG. 3 shows another embodiment of the present invention.
  • a tube core 1 consisting of a magdevelop high frequencies.
  • connection wires at opposite end thereof an associated ferromagnetic core
  • connection wires of the coil being firmly anchored to opposite ends of the ferromagnetic core and extending outwardly therefrom
  • cylindrical'member having the coil and core contained inside thereof
  • resistance layer positioned on the in side surface of the cylindrical member
  • electrically conductive glue making electrical connection between the resistance member and the connection wires at opposite ends of the cylindrical member, and said electrically conductive glue also sealing off the interior of the cylindrical member from the exterior thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Details Of Resistors (AREA)
US00339736A 1972-03-17 1973-03-09 Dampened choke coil Expired - Lifetime US3835370A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19727210297 DE7210297U (de) 1972-03-17 1972-03-17 Bedaempfte drosselspule
DE19727210330 DE7210330U (de) 1972-03-17 1972-03-17 Bedaempfte drosselspule

Publications (1)

Publication Number Publication Date
US3835370A true US3835370A (en) 1974-09-10

Family

ID=25946949

Family Applications (1)

Application Number Title Priority Date Filing Date
US00339736A Expired - Lifetime US3835370A (en) 1972-03-17 1973-03-09 Dampened choke coil

Country Status (11)

Country Link
US (1) US3835370A (es)
JP (1) JPS4912363A (es)
AT (1) AT326235B (es)
CH (1) CH558073A (es)
DD (1) DD102850A5 (es)
ES (1) ES412776A1 (es)
FR (1) FR2176761B3 (es)
GB (1) GB1401127A (es)
IT (1) IT981334B (es)
NL (1) NL7300957A (es)
SE (1) SE377514B (es)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4394631A (en) * 1981-05-29 1983-07-19 C-Cor Electronics, Inc. Radio frequency choke and method of use
DE4432739A1 (de) * 1994-09-14 1996-03-21 Siemens Matsushita Components Induktives elektrisches Bauteil
DE19636742C2 (de) * 1996-09-10 1999-05-12 Siemens Matsushita Components Einrichtung zur Einstellung eines definierten elektrischen Potentials auf einem Ferritkern eines induktiven Bauelementes und/oder zur Verringerung einer Bedämpfung des induktiven Bauelementes durch von dessen Magnetfeld induzierte Wirbelströme
WO2004021378A1 (en) * 2002-08-30 2004-03-11 Bc Components Holdings B.V. Electrical component with impedance and resistor
US20040238202A1 (en) * 2003-06-02 2004-12-02 Ohmcraft Inc. Method of making an inductor with written wire and an inductor made therefrom
US20170251522A1 (en) * 2014-11-06 2017-08-31 Hirschmann Car Communication Gmbh Contact pin made of copper wire

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0547457Y2 (es) * 1987-02-28 1993-12-14
IT1245557B (it) * 1991-03-20 1994-09-29 Gmv Martini Spa Dispositivo atto a ridurre i "picchi" di corrente nell'avviamento di un motore elettrico asincrono per il comando di ascensori di tipo oleodinamico

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1931043A (en) * 1932-03-05 1933-10-17 Western Electric Co Electrical impedance device
US2368474A (en) * 1942-09-24 1945-01-30 Gen Electric Decoupling unit
US2692372A (en) * 1951-07-19 1954-10-19 Rca Corp Wide band radio frequency choke coil
US2976502A (en) * 1958-03-13 1961-03-21 Aladdin Ind Inc Inductive devices
US3171091A (en) * 1960-08-02 1965-02-23 Nytronics Inc Transformer encased in magnetic tape
US3176217A (en) * 1961-01-26 1965-03-30 Tdk Electronics Co Ltd Combined unit of resistance and inductance
US3295055A (en) * 1961-04-20 1966-12-27 Tdk Electronics Co Ltd Combined unit of impedance

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1931043A (en) * 1932-03-05 1933-10-17 Western Electric Co Electrical impedance device
US2368474A (en) * 1942-09-24 1945-01-30 Gen Electric Decoupling unit
US2692372A (en) * 1951-07-19 1954-10-19 Rca Corp Wide band radio frequency choke coil
US2976502A (en) * 1958-03-13 1961-03-21 Aladdin Ind Inc Inductive devices
US3171091A (en) * 1960-08-02 1965-02-23 Nytronics Inc Transformer encased in magnetic tape
US3176217A (en) * 1961-01-26 1965-03-30 Tdk Electronics Co Ltd Combined unit of resistance and inductance
US3295055A (en) * 1961-04-20 1966-12-27 Tdk Electronics Co Ltd Combined unit of impedance

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4394631A (en) * 1981-05-29 1983-07-19 C-Cor Electronics, Inc. Radio frequency choke and method of use
DE4432739A1 (de) * 1994-09-14 1996-03-21 Siemens Matsushita Components Induktives elektrisches Bauteil
DE4432739B4 (de) * 1994-09-14 2005-03-17 Epcos Ag Induktives elektrisches Bauteil
DE19636742C2 (de) * 1996-09-10 1999-05-12 Siemens Matsushita Components Einrichtung zur Einstellung eines definierten elektrischen Potentials auf einem Ferritkern eines induktiven Bauelementes und/oder zur Verringerung einer Bedämpfung des induktiven Bauelementes durch von dessen Magnetfeld induzierte Wirbelströme
US6746785B1 (en) 1996-09-10 2004-06-08 Siemens Aktiengesellschaft Device for setting a defined electric potential on a ferrite core of an inductive component and/or for reducing damping of the inductive component by losses induced by its magnetic field
WO2004021378A1 (en) * 2002-08-30 2004-03-11 Bc Components Holdings B.V. Electrical component with impedance and resistor
US20040238202A1 (en) * 2003-06-02 2004-12-02 Ohmcraft Inc. Method of making an inductor with written wire and an inductor made therefrom
US20170251522A1 (en) * 2014-11-06 2017-08-31 Hirschmann Car Communication Gmbh Contact pin made of copper wire

Also Published As

Publication number Publication date
ATA99573A (de) 1975-02-15
JPS4912363A (es) 1974-02-02
DD102850A5 (es) 1973-12-20
ES412776A1 (es) 1976-05-16
CH558073A (de) 1975-01-15
NL7300957A (es) 1973-09-19
AT326235B (de) 1975-11-25
FR2176761B3 (es) 1976-03-12
SE377514B (es) 1975-07-07
FR2176761A1 (es) 1973-11-02
GB1401127A (en) 1975-07-16
IT981334B (it) 1974-10-10

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