EP0487388A1 - Drossel, insbesondere für Kurzwellen - Google Patents

Drossel, insbesondere für Kurzwellen Download PDF

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Publication number
EP0487388A1
EP0487388A1 EP91403084A EP91403084A EP0487388A1 EP 0487388 A1 EP0487388 A1 EP 0487388A1 EP 91403084 A EP91403084 A EP 91403084A EP 91403084 A EP91403084 A EP 91403084A EP 0487388 A1 EP0487388 A1 EP 0487388A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
conductor
coil
inductor
plane
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.)
Granted
Application number
EP91403084A
Other languages
English (en)
French (fr)
Other versions
EP0487388B1 (de
Inventor
Jean-Marc Martin
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0487388A1 publication Critical patent/EP0487388A1/de
Application granted granted Critical
Publication of EP0487388B1 publication Critical patent/EP0487388B1/de
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
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/005—Inductances without magnetic core
    • 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
    • H01F29/06—Variable transformers or inductances not covered by group H01F21/00 with current collector gliding or rolling on or along winding

Definitions

  • the invention relates to an inductor. It targets in particular the field of short waves, for the transmission of large powers such as 100 KW and more, as is encountered for example in a broadcasting transmitter.
  • An example of a shortwave broadcasting transmitter operating between 6 and 30 MHz notably includes an adapter block including an inductor in the form of a coil made up of several turns juxtaposed along an axis.
  • a transmission line consisting of two conductors arranged facing each other, extending linearly over a determined length L can, if L ⁇ ⁇ 4 , ⁇ being the wavelength of the signal crossing the line, behave like an inductor whose value is proportional to L.
  • the Applicant has discovered that it is possible to take advantage of the inductive behavior of a transmission line to produce a discrete component constituting an inductor, in a relatively compact volume, while avoiding or, at least, reducing the aforementioned drawbacks.
  • the inductance of the prior art represented in FIG. 1, comprises a coil 1 of a silver copper tube wound in a spiral and defining several turns 2 to 4 juxtaposed along an axis 5 of the coil 1.
  • the copper tube is thick enough to ensure that the coil 1 does not deform significantly.
  • An upper end 6 of the coil 1 is electrically insulated connected to a motor 8 mounted on an upper earthing panel 10 by a bearing 9, while a lower end 7 of the coil is mounted on a bearing 13 , itself connected to a lower grounding panel 14 by a capacitor 15.
  • a fixed vertical return arm 16 extends parallel to the axis 5 of the coil 1 and is fixed to the upper end 6 of the coil 1.
  • a sliding contact 17 extends between the return arm 16 and the coil 1 and is coupled to them in a manner not shown in FIG. 1.
  • an inductance of adjustable value is formed between a terminal 20 connected to the lower end 7 of the coil and a terminal 21 disposed at a free end of the return arm 16 .
  • the inductance is adjusted as follows.
  • the actuation of the motor 8 causes the coil to rotate about its axis 5, which has the effect of causing a vertical displacement of the sliding contact 17 along the return arm 16.
  • An inductor 30 according to the present invention is shown in Figure 2. It comprises a cylinder 31 having an axis 32 and made of a conductive material such as copper.
  • the cylinder has a circular section and is open at both ends.
  • a coil 33 is arranged coaxially in the cylinder 31. It consists of a conductor wound in a spiral so as to form two turns.
  • the conductor is a copper tube 34.
  • the coil 33 occupies a determined position relative to the cylinder 31 in order to promote a significant electromagnetic coupling between the tube 34 and the cylinder while ensuring an electromagnetic decoupling between the two turns. This result is obtained by choosing a distance D between turns large in front of a distance d between a center of the tube 34 and an interior surface 35 of the cylinder 31. Tests have made it possible to show that a value of D equal to at least three times, and preferably four times d, was satisfactory.
  • the coil 33 is fixed to the inside face 35 of the cylinder 31 by means of several insulating bars 36 distributed over its length, each bar extending perpendicular to the inside face 35 of the cylinder 31 and connecting the latter to the tube 34.
  • the bars insulators are in particular ceramic.
  • connection terminal 41 is fixed on the cylinder 31 in the vicinity of the connection terminal 40. Between the connection terminals 40, 41 is therefore formed an electrical circuit comprising, in series, the coil 33 and the cylinder 31.
  • the inductor 30 is mechanically connected to an earthing panel 42, but electrically insulated from it, by insulating rods 43 fixed on an upper end edge of the cylinder 31. These insulating rods are in particular made of ceramic.
  • a motor 44 is fixed on the face of the earthing panel 42 furthest from the inductor 30, coaxial therewith. It has a drive shaft 45, in particular metallic, which carries at a free end a transverse insulating rod 46.
  • the insulating rod 46 carries at a free end a sliding contact 47 substantially U-shaped, having a base 50 fixed to the insulating rod 46 and two wings 51,52.
  • the base 50 and the wings 51, 52 of the sliding contact 47 are in contact with the tube 34, the wings also having a free end bearing on the inside face 35 of the cylinder 31.
  • the sliding contact 47 therefore provides a localized electrical connection. between the coil 33 and the cylinder 31, short-circuiting an upper portion of the inductor 30.
  • the motor 44 is arranged to give the drive shaft 45 a combined movement of rotation and axial translation corresponding to the displacement of the sliding contact 47 on the tube 34.
  • Means are provided to ensure circulation of water inside the tube 34, when the inductor is under tension.
  • the tube 34 constitutes, with the adjacent flat conductor formed by the cylinder 31, an asymmetrical line having a length L equal to the length of the tube 34, this line being short-circuited.
  • the field lines are confined in a peripheral region 55 around the tube 34 (FIG. 3), so that by choosing a distance D between two adjacent turns which is sufficiently large, the peripheral regions 55 respectively relating to these two turns do not overlap .
  • the field lines are confined near the cylinder 31, leaving a region, along the axis of the inductance, free of any electromagnetic radiation.
  • the electromagnetic radiation is therefore limited to a space defined by a solenoid surrounding the tube 34 and centered on it. This radiation is moreover only present along a lower portion of the tube 34 which is not short-circuited and extends between the sliding contact 47 and the connection terminal 40.
  • the capacities between turns of the coil 33 do not in practice modify the value of the inductance, even at high frequencies such as 150 MHz.
  • Another advantage of the invention consists in that the motor 44 and the drive shaft 45 are not immersed in any magnetic field since they are located in a region close to the axis of the inductance: they do not risk therefore not to cause parasitic effects. It follows that the motor 44 does not necessarily need to be separated from the inductor 30 by the earthing panel 42.
  • the motor 44 will be designed either as a separate part from the inductor 30, fixed on a support panel common to these two parts, or as a part integrated into the inductor, fixed on an insulating chassis thereof. .
  • the tube 34 could be arranged at the exterior of the cylinder 31 and attached to an exterior surface thereof.
  • the inductor 30 is not adjustable and therefore does not include sliding contact or means for setting it in motion.
  • the cylinder 31 constitutes a return conductor of the inductor 30.
  • the return conductor is arranged along the means for driving the sliding contact 47, that is to say say along the rod 46 and the drive shaft 45.
  • FIGS. 4 and 5 A practical embodiment of the inductor of FIG. 2 is shown in FIGS. 4 and 5.
  • An inductor 60 comprises a cylinder 61 inside which is fixed a tube 63 of a coil 62.
  • the inductor 60 is suspended from a panel 64.
  • a split tube 65 having a longitudinal slot 66 is mounted for rotation at its two ends, on the panel 64 and on a plate 68 resting on a bottom 67 insulating the inductor 60 respectively, by means of bearings 70,71.
  • a worm screw 72 is arranged coaxially inside the split tube 65 and extends over a length greater than that of the split tube. It is rotatably mounted at its two ends, on the bottom 67 of the inductor 60 and on a plate 73 resting on the panel 67 respectively, by means of bearings 75, 74.
  • a motor 76 is fixed on the plate 73 and drives two driving pinions, namely a pinion 81 of large diameter and a pinion 82 of small diameter, which cooperate respectively with two driven pinions, namely a pinion of small diameter 83 fixed near one end of the worm 72 adjacent to the motor 76 and a large diameter pinion 84 fixed to one end of the split tube 65 adjacent to the motor 76.
  • two driving pinions namely a pinion 81 of large diameter and a pinion 82 of small diameter
  • two driven pinions namely a pinion of small diameter 83 fixed near one end of the worm 72 adjacent to the motor 76 and a large diameter pinion 84 fixed to one end of the split tube 65 adjacent to the motor 76.
  • a sliding contact assembly 90 includes a Y-shaped cursor 91 having a trunk 92 and two legs 93.94.
  • the trunk 92 has a thickness slightly smaller than a width of the slot 66 of the split tube and it passes through this slot.
  • a free end of the trunk 92 carries a threaded cylinder 95 crossed by the endless screw 72 and cooperating therewith.
  • the two branches 93, 94 are identical and will be described with reference to the branch 94 which carries a transverse piston cylinder 96 in which is disposed a hollow piston 97 and open at one end. From a bottom 100 of the piston cylinder 96, and inside the piston 97, extends a core 101.
  • a screw 102 freely crosses the bottom 100 of the piston cylinder 96, the core 101 and cooperates with a tapping made in a bottom 103 of the piston 97.
  • a helical spring 104 is interposed between the core 101 and the bottom 103 of the piston 97.
  • An outer face of the bottom 103 of the piston 97 carries a yoke 105 supporting a shaft 106.
  • a sliding contact support 107 in the general V shape is rotatably mounted on the shaft 106 in a central region.
  • the sliding contact support 107 carries, at two ends respectively, two sliding contact pads 111,112 bearing on an inner face of the cylinder 61 of the inductor 60 and on the tube 63 thereof, respectively.
  • the spring 104 elastically applies the sliding contact pads 111, 112 on the inductor 60.
  • the screw 102 limits the movement of the piston 97 towards the outside of the piston cylinder 96.
  • the sliding contact support 107 is hollow so that it can be traversed by a cooling fluid, in a manner not shown in FIG. 4.
  • the rotation of the motor 76 causes a rotation of the worm 72, that is to say a displacement in translation of the sliding contact assembly 90 along the worm; she provokes also a rotation of the split tube 65, that is to say an identical rotation of the sliding contact assembly 90 around the worm.
  • the pinions 81 to 84 are chosen so as to produce multiplication / demultiplication ratios such that the sliding contact assembly 90 describes a helical path corresponding to the helical shape of the tube 63 of the inductor 60.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Linear Motors (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
EP91403084A 1990-11-23 1991-11-15 Drossel, insbesondere für Kurzwellen Expired - Lifetime EP0487388B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9014622 1990-11-23
FR9014622A FR2669766B1 (fr) 1990-11-23 1990-11-23 Inductance, notamment pour ondes courtes.

Publications (2)

Publication Number Publication Date
EP0487388A1 true EP0487388A1 (de) 1992-05-27
EP0487388B1 EP0487388B1 (de) 1995-04-12

Family

ID=9402505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91403084A Expired - Lifetime EP0487388B1 (de) 1990-11-23 1991-11-15 Drossel, insbesondere für Kurzwellen

Country Status (8)

Country Link
US (1) US5175526A (de)
EP (1) EP0487388B1 (de)
CN (1) CN1061677A (de)
CA (1) CA2055658A1 (de)
CS (1) CS338891A3 (de)
DE (1) DE69108862T2 (de)
FR (1) FR2669766B1 (de)
YU (1) YU169291A (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711290B1 (fr) * 1993-10-15 1995-12-15 Thomson Csf Ensemble de radiodiffusion comportant une antenne rotative à dipôles filaires et joint rotatif conçu pour cet ensemble.
US7176840B1 (en) 2005-04-08 2007-02-13 Michael Peter Kelley Variable spacing inductance coil apparatus and method
CN106449064A (zh) * 2016-11-24 2017-02-22 湖南纽帕科技有限公司 可调电感器、电感调节方法及电抗补偿型无线充电系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0290928A1 (de) * 1987-05-15 1988-11-17 Siemens Aktiengesellschaft Radiofrequente Abstimmspule
FR2641406A1 (fr) * 1988-12-30 1990-07-06 Thomson Csf Bobine d'inductance variable a curseur central

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1190007A (en) * 1915-09-24 1916-07-04 Joseph A Rayder Curtain or shade fixture.
US1860722A (en) * 1930-04-15 1932-05-31 Corrie F Rudolph Variable inductance coil
US1911980A (en) * 1932-03-31 1933-05-30 Gen Electric Variable inductor
US2691141A (en) * 1950-09-23 1954-10-05 Collins Radio Co Variable inductor
US2783441A (en) * 1952-07-25 1957-02-26 Gen Electric Transformer
US2781514A (en) * 1953-04-29 1957-02-12 Itt Helical antenna system
US2839634A (en) * 1956-01-30 1958-06-17 Johnson Electronics Inc Electric switch
US2969460A (en) * 1957-10-14 1961-01-24 Collins Radio Co Adjustable high-frequency tuning unit
US3078430A (en) * 1960-04-27 1963-02-19 Charles P Majkrzak Sliding contact arrangement
US3225319A (en) * 1963-01-25 1965-12-21 Trench Anthony Barclay Shunt reactors
US3444494A (en) * 1967-11-17 1969-05-13 Hughes Aircraft Co High power variable inductor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0290928A1 (de) * 1987-05-15 1988-11-17 Siemens Aktiengesellschaft Radiofrequente Abstimmspule
FR2641406A1 (fr) * 1988-12-30 1990-07-06 Thomson Csf Bobine d'inductance variable a curseur central

Also Published As

Publication number Publication date
DE69108862D1 (de) 1995-05-18
FR2669766A1 (fr) 1992-05-29
CN1061677A (zh) 1992-06-03
US5175526A (en) 1992-12-29
EP0487388B1 (de) 1995-04-12
CA2055658A1 (en) 1992-05-24
YU169291A (sh) 1994-06-24
FR2669766B1 (fr) 1993-01-22
DE69108862T2 (de) 1995-08-24
CS338891A3 (en) 1992-06-17

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