EP0007275B1 - Veränderliche Induktivität und Sender mit solch einer Induktivität - Google Patents

Veränderliche Induktivität und Sender mit solch einer Induktivität Download PDF

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Publication number
EP0007275B1
EP0007275B1 EP79400480A EP79400480A EP0007275B1 EP 0007275 B1 EP0007275 B1 EP 0007275B1 EP 79400480 A EP79400480 A EP 79400480A EP 79400480 A EP79400480 A EP 79400480A EP 0007275 B1 EP0007275 B1 EP 0007275B1
Authority
EP
European Patent Office
Prior art keywords
slide contact
conductor
axis
cursor
leaf springs
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
EP79400480A
Other languages
English (en)
French (fr)
Other versions
EP0007275A1 (de
Inventor
Gilbert Maillard
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 EP0007275A1 publication Critical patent/EP0007275A1/de
Application granted granted Critical
Publication of EP0007275B1 publication Critical patent/EP0007275B1/de
Expired 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
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers

Definitions

  • the present invention relates to a variable inductor comprising: a fixed winding made of a conductor wound on a circular helix and a slider resting on the conductor, the displacement of the fulcrum of the cursor on the conductor being by a screwing movement of the cursor around the axis of the propeller.
  • variable inductances are known in which the cursor is placed inside the propeller and presses and slides on the conductor (see, for example, US-A-1,831,375); this slider provides the electrical connection with a rotary conductive axis disposed along the main axis of the propeller and can move longitudinally on this conductive axis.
  • the rotational movement of the conductor axis causes the cursor to move on the conductor, the latter serving as a guide rail for the cursor.
  • inductors are generally used in medium power transmitters and in the matching circuits of the antennas associated therewith.
  • the conductive axis of the inductor is most often driven in rotation using a motor which, on the one hand, thanks to its speed of rotation, ensures rapid positioning of the cursor and which, on the other hand , allows remote control or servo control in automatically tuned devices.
  • This rapid positioning corresponds to a very high speed of sliding of the contact on the conductor.
  • the pressure exerted by the cursor on the conductor must remain low while the cursor is moving at high speed;
  • the movement of the cursor at high speed is very generally linked to a reduced current in the inductance, therefore to a current which does not require a high pressure in the contact between the cursor and the conductor.
  • the current in the inductor is maximum and the contact pressure must be high to limit resistance and overheating at the point of contact.
  • the contact pressure is fixed and is most often chosen to be fairly high, which, as seen above, is well suited when the cursor is at I-stop or slides at low speed on the conductor. but leads to significant wear of the contact and / or of the conductor during rapid positioning.
  • the present invention aims to reduce and, if possible, eliminate these drawbacks.
  • variable inductor of the type indicated at the beginning of this text is characterized in that it comprises a spacer device associated with the cursor and which, under the effect of the centrifugal force produced during a screwing movement , tends to move the cursor away from the driver.
  • Figure 1 is a view of a variable inductance, reduced, for convenience of drawing and reading the drawing, to the elements necessary for understanding the invention. It should also be noted that for the same reasons the dimensions of certain elements of the inductor have not been observed in FIG. 1.
  • the winding 1 is made of conductive wire of rectangular section with a thickness of 1.5 mm and a width of 8 mm; it comprises, in total, fifty coils wound in the form of a circular helix of axis XX.
  • the dimensions of the winding are: overall length 300 mm, diameter 120 mm.
  • the insulating bars 10, 11, 12 are made of rigid plastic and have notches 2 mm deep in which the conductive wire of the winding rests; they are arranged at 120 ° from one another around the axis XX and serving as spacers for the flanges, not shown, of the variable inductance.
  • the axis of rotation, 2 is a hollow square tube, 18 mm square, made of silver copper; it is connected to the flanges, in the vicinity of its ends, not shown, by means of plastic bearings. One of the ends of axis 2 crosses one of the flanges of the inductor and is designed to be coupled to the motor axis.
  • the slider 3 also includes a device for separating the two elastic blades 4, 5; this spacing device, 8, comprises a weight 81 of 0.5 gram and a lever 82 located on either side of a small pivot axis 80 with which they form a single piece. Part of the elastic blade 5 has been torn off to allow a better view of the spacer.
  • the elastic blade 4 has, in its part forming one of the branches of the cursor clip, a hole 401 and, on either side of this hole, two tongues folded at 90 ° and each pierced with a circular hole and which serve as a bearing for the minor axis 80; the minor axis 80 and the lever 82 are located inside the branches of the cursor clamp; the counterweight 81 is connected to the minor axis 80 through the hole 40.
  • variable inductance which has just been described is intended to operate with an average HF current of 12A when the cursor is stopped or traverses the last turn preceding its breakpoint and an average HF current of 0.5A when the cursor is moving fast.
  • Figure 2 shows, seen in section, an assembly consisting of two elastic blades 21, 22 and a device for spacing these blades, 23.
  • This assembly replaced the assembly consisting of parts 4, 5 and 8 of FIG. 1 makes it possible to constitute another variable inductor according to the invention.
  • the spacing device 23 consists of a steel ball, placed between the two elastic blades and held in a pocket formed by two kinds of bumps, one per blade, the concave parts of which face each other.
  • FIG. 2 also appear four silver contacts, 24 to 27, welded to the blades. These contacts, which have the shape of hemispheres of about 5 mm in diameter, are intended to ensure the sliding contact of the cursor with the axis of the inductor (contacts 24, 25) and with the winding (contacts 26, 27 ).
  • the invention is applicable, in particular to transmitters and, more particularly to medium power transmitters.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Position Input By Displaying (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Claims (5)

1. Regelbarer Induktor, der eine Spule (1) einschliesst, die aus einem Leiter besteht, der spiralförmig gewunden ist, sowie einen Kontaktschieber (3), der gegen den Leiter gedrückt ist, wobei die Verschiebung des Lagerpunkts des Kontaktschiebers auf dem Leiter durch eine Schraubbewegung des Kontaktschiebers um die Achse der Spiralwindung erfolgt, dadurch gekennzeichnet, dass er eine Abstandsvorrichtung (8, 23) einschliesst, die mit dem Kontaktschieber (3) verbunden ist, und die unter Wirkung der Fliehkraft, die durch die Schraubbewegung des Kontaktschiebers entsteht, den Druck des Kontaktschiebers auf den Leiter zu vermindern trachtet.
2. Induktor gemäss Anspruch 1, in dem der Kontaktschieber eine Zange einschliesst, wobei die Zange zwei gegenüberliegende Arme (4, 5) hat, die den Leiter umfassen, dadurch gekennzeichnet, dass die Abstandsvorrichtung mit den zwei gegenüberliegenden Armen verbunden ist, um den einen Arm von dem anderen durch die Wirkung der Fliehkraft, die durch eine Schraubbewegung des Kontaktschiebers entsteht, entfernt zu halten.
3. Induktor gemäss Anspruch 2, dadurch gekennzeichnet, das die beiden gegenüberliegenden Arme zwei Blattferden (4, 5) sind und die Abstandsvorrichtung umfasst: eine Drehachse (80), deren Lager mit einer (4) der Beiden Blattfedern aus einem Stück besteht, einen Hebel (82), der mit einem seiner Enden mit der Drehachse (80) aus einem Stück besteht, und einem Gewicht (81 das mit der Drehachse aus einem Stück besteht, um die Drehachse (80) zum Drehen zu veranlassen und den Hebel (82) auf die andere (5) der beiden Blattfedern unter Wirkung der Fliehkraft, die durch die Schraubbewegung des Kontaktschiebers entsteht, zu drücken.
4. Induktor gemäss Anspruch 2, dadurch gekennzeichnet, dass die beiden gegenüberleigenden Arme zwei Blattfedern (21, 22) sind, wovon jede einen hohlen Teil hat und diese beiden hohlen Teile der beiden gegenüberleigenden Blattfedern eine Tasche bilden; und dadurch, dass die Abstandsvorrichtung eine Kugel (23) einschliesst, die, unter Wirkung der Fliehkraft, die durch eine Schraubbewegung des Kontaktschiebers entsteht, die Tasche zu verlassen trachtet und so den einen von dem anderen gegenüberliegenden Arm trennt.
5. Sender, dadurch gekennzeichnet, dass er mindestens einen das verstehend beanspruchten Induktors einschliesst.
EP79400480A 1978-07-10 1979-07-10 Veränderliche Induktivität und Sender mit solch einer Induktivität Expired EP0007275B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7820539A FR2431172A1 (fr) 1978-07-10 1978-07-10 Inductance variable et emetteur comportant une telle inductance
FR7820539 1978-07-10

Publications (2)

Publication Number Publication Date
EP0007275A1 EP0007275A1 (de) 1980-01-23
EP0007275B1 true EP0007275B1 (de) 1982-03-24

Family

ID=9210546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400480A Expired EP0007275B1 (de) 1978-07-10 1979-07-10 Veränderliche Induktivität und Sender mit solch einer Induktivität

Country Status (4)

Country Link
US (1) US4222022A (de)
EP (1) EP0007275B1 (de)
DE (1) DE2962336D1 (de)
FR (1) FR2431172A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2641406B1 (fr) * 1988-12-30 1991-02-15 Thomson Csf Bobine d'inductance variable a curseur central
US5078185A (en) * 1991-01-09 1992-01-07 Signode Corporation Sealer mechanism for a tool for applying a seal to overlapping lengths of strap
TW502264B (en) * 2000-08-26 2002-09-11 Samsung Electronics Co Ltd RF matching unit
WO2010043546A1 (en) * 2008-10-13 2010-04-22 Delphi Technologies, Inc. High frequency ignition system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831375A (en) * 1930-10-29 1931-11-10 Bell Telephone Labor Inc Electrical tuning device
US2883501A (en) * 1956-12-20 1959-04-21 Reginald P Paget Variable resistor contact blade tension adjusting means

Also Published As

Publication number Publication date
DE2962336D1 (en) 1982-04-29
EP0007275A1 (de) 1980-01-23
FR2431172B1 (de) 1981-09-11
US4222022A (en) 1980-09-09
FR2431172A1 (fr) 1980-02-08

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