EP0928944A1 - Vorrichtung zur Beschleunigung eines bweglichen Körpers - Google Patents

Vorrichtung zur Beschleunigung eines bweglichen Körpers Download PDF

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Publication number
EP0928944A1
EP0928944A1 EP98400036A EP98400036A EP0928944A1 EP 0928944 A1 EP0928944 A1 EP 0928944A1 EP 98400036 A EP98400036 A EP 98400036A EP 98400036 A EP98400036 A EP 98400036A EP 0928944 A1 EP0928944 A1 EP 0928944A1
Authority
EP
European Patent Office
Prior art keywords
segments
mobile
projectile
segment
strands
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
EP98400036A
Other languages
English (en)
French (fr)
Other versions
EP0928944B1 (de
Inventor
Michel Amiet
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.)
Direction General pour lArmement DGA
Etat Francais
Original Assignee
Direction General pour lArmement DGA
Etat Francais
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 to FR9614921A priority Critical patent/FR2756985B1/fr
Application filed by Direction General pour lArmement DGA, Etat Francais filed Critical Direction General pour lArmement DGA
Priority to DE1998604755 priority patent/DE69804755T2/de
Priority to EP98400036A priority patent/EP0928944B1/de
Publication of EP0928944A1 publication Critical patent/EP0928944A1/de
Application granted granted Critical
Publication of EP0928944B1 publication Critical patent/EP0928944B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B6/00—Electromagnetic launchers ; Plasma-actuated launchers
    • F41B6/006—Rail launchers

Definitions

  • the present invention relates to an electromagnetic device allowing to accelerate a mobile conductor of electricity, intended especially to be used to launch a projectile.
  • the invention relates more particularly to a device of the type comprising means for supplying electric power to the mobile and accelerate it under the effect of so-called Laplace magnetic forces (again say of Lenz) and means to guide the mobile during its race acceleration.
  • This type of device makes it possible to obtain high speeds in output, of the order of 2 to 5 km / s for a projectile whose mass is between one hundred grams and several kilograms.
  • the two conductor rails are connected for example to a set of capacitors capable of restoring energy in a very short time considerable electrical.
  • charging the capacitors may become difficult to manage when all the capacitors are not used.
  • the subject of the present invention is a new device which allows in particular to overcome the aforementioned drawbacks.
  • a device to accelerate a mobile of the type comprising guide means for guiding the mobile during its acceleration stroke and means for supplying the mobile with electric current and accelerate it under the effect of the magnetic forces of Laplace (or Lenz), characterized in that the means power supply have at least two segments conductors of electricity, each connected to an energy source electric and adjustable in position along the guide means so as to pass an electric current through the mobile when its passage in predetermined locations chosen according to the acceleration or speed to give to the mobile.
  • each segment is connected to a capacitive electrical power source of constant nominal capacity.
  • the invention it is no longer necessary to modify the acceleration given to the mobile to act on the connections connecting the capacitors and conductor rails as it suffices to position differently the conductive segments to decrease or increase the value of the intensity of the electric current flowing through the mobile in one given location of its trajectory and the intensity of magnetic forces of Laplace (or Lenz) who exercise on it.
  • the device comprises at least two segments placed in alignment one of the other with a spacing between them.
  • the polarity and the positioning of the segments are chosen so as to cause the mobile to rotate on itself when it leaves the device.
  • the device comprises screw jacks for driving in axial displacement the segments along the guide means.
  • each segment is in the form of a section of rail guided in sliding by two slides in electrically insulating material.
  • each segment participates in guiding the mobile.
  • the segments are distributed angularly around a parallel geometric axis to the direction of acceleration of the mobile.
  • each segment has an aluminum or copper substrate coated on its side intended to come into contact with the mobile of a silicon carbide deposit.
  • the mobile has conductive strands on all or part of its periphery electricity, intended to establish sliding electrical contact with the segments.
  • the invention also relates to a projectile comprising on its entire periphery of the electrically conductive strands capable of establishing sliding electrical contact with the segments of a device electromagnetic as above.
  • FIGS. 1 and 2 show a projectile 1 intended to be used in an electromagnetic device according to the invention.
  • This projectile 1 comprises in a particular example describes a symmetrical body of revolution around an X axis and present on its periphery an annular groove in which a crown is retained electrically conductive 3, on the radially outer surface of which stand up strands 2 conductors of electricity, constituting a brush adapted to collect the electric current by sliding contact.
  • These strands 2 are known in themselves, are preferably of the type described in the French patent 79 27526, and will be described in more detail below.
  • the projectile can present, without leaving the frame of the invention, a non-symmetrical section of revolution, square by example.
  • FIGS. 3 and 4 show schematically a electromagnetic device 4 according to an exemplary embodiment of the invention.
  • This device comprises means for guiding the projectile 1 along a geometrical axis Y confused during the launch with the axis X and means for supplying electric current to the projectile 1.
  • the guide means comprise a plurality of slides 5 straight lines made of an electrically insulating material. These slides 5 are distributed angularly around the Y axis.
  • the radially internal surface of the slides 5 is cylindrical of revolution around the Y axis and is used to guide the projectile during its acceleration race.
  • the slides 5 also constitute a guide structure for a plurality of segments 6 electrical conductors, connected each by a conducting wire 7 to one or more associated capacitors.
  • Each segment 6 can slide along the space formed between two adjacent slides 5.
  • the segments 6 comprise in the example described a substrate in aluminum or copper for example and, on the radially internal face intended to come into contact with the conductive strands 2, a deposit of silicon carbide.
  • This deposition can be carried out by centrifugation in particular.
  • the radially internal surface of the segments 6 is located in the continuity of the radially internal surface of the slides 5.
  • the diameter of the projectile can be by example between 10 and 140 mm.
  • the length of the slides 5 can be for example 6 m, and the length of a segment 0.5 m.
  • a wide variety of means can be used to move parallel to the Y axis each of the segments 6.
  • the cylinder screws are rotated on themselves by motor means known in themselves and not shown and are engaged in studs 8 integral with respective segments 6.
  • the displacement of each segment can be controlled by a computer programmed to calculate, depending on the desired speed at the output of the device, the relative arrangement of the segments making it possible to reach this speed.
  • the studs 8 are crossed by threaded holes 9 in which engage the screws, and further serve, in the example described, at the connection of the wires 7.
  • segments 6 can be arranged in the extension one of the other.
  • FIG. 3 shows two segments 6 arranged in alignment with each other with a spacing between them. These two segments 6 are driven in displacement simultaneously by the rotation of the B axis screw.
  • All segments 6 located on the same side of a diametrical plane containing the Y axis can have for example the same polarity and those located on the other side with the opposite polarity, as illustrated in figure 4, on which the neutral line N has been represented.
  • the segments 6 are positioned, preferably taking care that two segments of opposite polarities intended to come simultaneously to the projectile contact are substantially diametrically opposed.
  • the aligned segments have advantageously alternating polarities.
  • the strands 2 are embedded at one end in the crown 3 and have a length in overhang preferably exceeding at least 10% the average spacing between the projectile 1 and the segments 6.
  • the diameter of the strands 2 is between 60 ⁇ m and 100 ⁇ m and their length is less than 15 mm.
  • the strands 2 are made of metal alloy hard, with good elasticity, for example in cadmium bronze or an alloy FeSi or copper and its alloys.
  • the strands 2 are obtained for example by drawing possibly a work hardening.
  • Electrically non-conductive strands can also be added for lubrication purposes for example.
  • the device 4 can be used in the following way.
  • the segments 6 are arranged for example around the Y axis along a double helix, that is to say that when we turn in a given direction around the Y axis, two successive segments of the same polarity are offset axially towards the exit of the device and the segments of opposite polarities are arranged symmetrically with respect to the Y axis.
  • the position of the segments is chosen according to the intensity of current which must pass through the projectile at a given location in its launch course and acceleration resulting from the positioning of segments can be easily calculated by those skilled in the art.
  • the range of projectile 1 fire can be changed by playing on the speed of the projectile at the exit of the device 4 resulting from the positioning of segments 6.
  • the projectile then establishes an electrical contact between the two first segments of opposite and diametrically opposite polarities and finds it propelled towards the exit, establishing as it travels a contact between the following segments which accelerate it again.
  • FIG. 5 illustrates a configuration in which the first five segments of the same polarity overlap two by two by a distance l and the fifth and sixth segments of the same polarity follow one another by overlapping by a greater distance L.
  • FIG. 6 shows another example of configuration of the segments 6 in which the axial overlap of the first five segments of the same polarity is equal to L and the overlap of the fifth and sixth segments is equal to l .
  • the current delivered simultaneously by several segments of the same polarity can be greater than the maximum current debited by a segment.
  • the invention is not limited to the embodiment which has just been described and it is possible in particular to replace the screw jacks used to move the segments by equivalent means.
  • the shape of the projectile and the location of the strands are not limited to the examples which have just been described and moreover the content of the projectile can be arbitrary.
  • the electromagnetic device can be used according to the invention not to launch a projectile but to move an organ remaining guided all along its trajectory.
  • the number of segments 6 of the same polarity is equal to six in the example shown in Figure 4 but we can of course use a different number of segments 6 without departing from the scope of the invention.
EP98400036A 1996-12-05 1998-01-09 Vorrichtung zur Beschleunigung eines beweglichen Körpers Expired - Lifetime EP0928944B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR9614921A FR2756985B1 (fr) 1996-12-05 1996-12-05 Dispositif electromagnetique permettant d'accelerer un mobile
DE1998604755 DE69804755T2 (de) 1998-01-09 1998-01-09 Vorrichtung zur Beschleunigung eines beweglichen Körpers
EP98400036A EP0928944B1 (de) 1996-12-05 1998-01-09 Vorrichtung zur Beschleunigung eines beweglichen Körpers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9614921A FR2756985B1 (fr) 1996-12-05 1996-12-05 Dispositif electromagnetique permettant d'accelerer un mobile
EP98400036A EP0928944B1 (de) 1996-12-05 1998-01-09 Vorrichtung zur Beschleunigung eines beweglichen Körpers

Publications (2)

Publication Number Publication Date
EP0928944A1 true EP0928944A1 (de) 1999-07-14
EP0928944B1 EP0928944B1 (de) 2002-04-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98400036A Expired - Lifetime EP0928944B1 (de) 1996-12-05 1998-01-09 Vorrichtung zur Beschleunigung eines beweglichen Körpers

Country Status (2)

Country Link
EP (1) EP0928944B1 (de)
FR (1) FR2756985B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6923106B2 (en) 2002-12-12 2005-08-02 General Atomics Rotating pulse forming network for shipboard operation of electromagnetic gun and capacitor module
US7444919B1 (en) 2006-08-29 2008-11-04 The United States Of America As Represented By The Secretary Of The Navy Tubular linear synchronous motor gun

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101677586B1 (ko) * 2015-12-04 2016-11-18 엘아이지넥스원 주식회사 직선전동기를 이용한 수직 발사 시스템

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576082A (en) * 1982-12-23 1986-03-18 Westinghouse Electric Corp. Linear fiber armature for electromagnetic launchers
US4945810A (en) * 1989-04-11 1990-08-07 The United States Of America As Represented By The United States Department Of Energy Railgun restrike control
GB2228306A (en) * 1989-02-18 1990-08-22 Tzn Forschung & Entwicklung Inductive energy converter
EP0478452A1 (de) * 1990-09-27 1992-04-01 Framatome Elektromagnetisches Geschütz
US5127308A (en) * 1990-09-17 1992-07-07 The Boeing Company Distributed energy store electromagnetic railgun
DE3613014A1 (de) * 1986-04-17 1995-04-20 Magnet Motor Gmbh Elektromagnetischer Linearbeschleuniger
US5540134A (en) * 1986-06-02 1996-07-30 Martin Marietta Corporation Alternator driven electromagnetic launching system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576082A (en) * 1982-12-23 1986-03-18 Westinghouse Electric Corp. Linear fiber armature for electromagnetic launchers
DE3613014A1 (de) * 1986-04-17 1995-04-20 Magnet Motor Gmbh Elektromagnetischer Linearbeschleuniger
US5540134A (en) * 1986-06-02 1996-07-30 Martin Marietta Corporation Alternator driven electromagnetic launching system
GB2228306A (en) * 1989-02-18 1990-08-22 Tzn Forschung & Entwicklung Inductive energy converter
US4945810A (en) * 1989-04-11 1990-08-07 The United States Of America As Represented By The United States Department Of Energy Railgun restrike control
US5127308A (en) * 1990-09-17 1992-07-07 The Boeing Company Distributed energy store electromagnetic railgun
EP0478452A1 (de) * 1990-09-27 1992-04-01 Framatome Elektromagnetisches Geschütz

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6923106B2 (en) 2002-12-12 2005-08-02 General Atomics Rotating pulse forming network for shipboard operation of electromagnetic gun and capacitor module
GB2396685B (en) * 2002-12-12 2006-04-05 Gen Atomics Electronmagnetic gun
GB2420170A (en) * 2002-12-12 2006-05-17 Gen Atomics Capacitor module for a pulse forming network
GB2420170B (en) * 2002-12-12 2006-09-06 Gen Atomics Capacitor module, for a pulse forming network
US7444919B1 (en) 2006-08-29 2008-11-04 The United States Of America As Represented By The Secretary Of The Navy Tubular linear synchronous motor gun

Also Published As

Publication number Publication date
EP0928944B1 (de) 2002-04-10
FR2756985A1 (fr) 1998-06-12
FR2756985B1 (fr) 1999-01-15

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