EP0478452A1 - Canon électromagnétique à rails - Google Patents

Canon électromagnétique à rails Download PDF

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Publication number
EP0478452A1
EP0478452A1 EP91402558A EP91402558A EP0478452A1 EP 0478452 A1 EP0478452 A1 EP 0478452A1 EP 91402558 A EP91402558 A EP 91402558A EP 91402558 A EP91402558 A EP 91402558A EP 0478452 A1 EP0478452 A1 EP 0478452A1
Authority
EP
European Patent Office
Prior art keywords
projectile
rails
segment
track
segments
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.)
Withdrawn
Application number
EP91402558A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jacques Meyer
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.)
Areva NP SAS
Original Assignee
Framatome 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 Framatome SA filed Critical Framatome SA
Publication of EP0478452A1 publication Critical patent/EP0478452A1/fr
Withdrawn legal-status Critical Current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 field of the invention is that of electromagnetic projectile launchers and more precisely that of electromagnetic rail guns.
  • pre-launchers such as, for example, a conventional chemical launcher or a light gas cannon.
  • An electromagnetic gun with rails comprising such switching devices is for example described in US Patent No. 4,319,168 in the name of Kemeny.
  • Each of the two rails of the launching ramp described is divided into conductive segments isolated from each other by means of insulation.
  • a sensor, of the electrical, optical or mechanical type, for projectile passage detection, is associated with a segment and controls the opening and closing of a switch at the terminals of which an energy storage capacitor is connected in series with a pulse transformer.
  • Each sensor is placed upstream of the corresponding channel segment to allow the switch to close in a time corresponding to the transit time of the projectile between this sensor and the rear of the corresponding segment to which the pulse is applied.
  • the present invention aims in particular to overcome these drawbacks.
  • an electromagnetic gun with projectile rails comprising an electrically conductive frame
  • said gun comprising a succession of power supply units for electrically supplying a succession of segments.
  • a projectile launch path formed by two parallel rails, said segments being isolated from each other on at least one of said rails and each of said power supplies being connected to the rear of one of said track segments by two terminals for delivering a propelling current to said projectile when the latter enters the corresponding track segment, the power supply of said corresponding track segment applying to said track segment, before said projectile penetrates said track segment, a lower voltage at a critical voltage at which there appears a risk of a parasitic arc forming between the rails of said seg track, the propellant current being supplied by the corresponding power supply unit due to the presence of said armature of said projectile between the rails of said corresponding rail segment,
  • Figure 1 shows an overview of a gun according to the present invention.
  • Figure 2 shows a view of a last power supply for this gun.
  • the barrel comprises various elements which are analogous, as regards their functions, to elements whose use has already been proposed for make such a canon.
  • Such known elements constitute two guide rails R, S for guiding a projectile P via a projectile armature A. These rails extend in the same longitudinal direction, forming for this projectile a launching path which extends from a rear end 8 to a front end 10.
  • These rails and this frame comprise electrically conductive elements for conducting a propellant current in series in one of these rails then through this frame, then in the other of these rails.
  • a transverse gap between these conductive elements of these two rails constitutes an electrical width D of this launching path.
  • the same metal part provides both, for each rail, the functions of mechanical guidance and conduction of the electric current. But it should be understood that these two functions could be performed by two separate parts, the whole of which would constitute the rail.
  • the launching track can be considered as consisting of a succession of track segments which are defined by these rail segments.
  • These track segments follow one another in increasing rows from a first segment of rank S1 at the rear end of this track, to a last segment SK at its front end.
  • one S of the two rails is a "segmented" rail made up of segments which are separated by insulating intervals.
  • the present invention can also be applied when the distinction between the successive segments results only from the electrical supply of the rail at successive points and from the electrical resistance of the rail.
  • a succession of power supplies B1 ... BK correspond to the track segments S1, ... SK. These blocks are controlled during each shot of a projectile to electrically supply the track segments successively as the projectile progresses. Each of them supplies the corresponding track segment by supplying it with propulsive current through two terminals BA, BB. These two bounds belong to this segment. They are respectively connected to the two rails at a rear end of this segment. The passage of this current through these rails creates a magnetic field. This field interacts with the current flowing through the armature A and thus applies a propelling force directed towards it.
  • the gun also includes charging means for charging each of these storage capacitors during this charging period.
  • these charging means consist of a dynamo-electric generator 2 associated with conditioning circuits not shown and with a rapid energizing switch 4 which is closed at the start of each charging period.
  • projectile introduction means 6 for introducing the projectile P provided with its armature A at the rear end of the first segment S1.
  • these means comprise a pre-launcher 6 which can be of known type.
  • the length L of the track segments is limited so that the number K of these segments is greater than three. This number is chosen to pass a propellant current of substantially constant intensity through the projectile armature A.
  • each segment should have a sufficient length so that the intensity of the magnetic field at the rear of the frame is generally not significantly reduced.
  • the propulsive force is in fact proportional to the product of this field intensity by the intensity of the propulsive current passing through the armature.
  • each of the track segments S1 is equal to or greater than five times the electrical width D of the launch track.
  • the storage capacitors are electrolytic capacitors.
  • Each of these capacitors for example the capacitor CN, has two electrodes 12, 14 and is protected against reverse polarity by a capacitor protection rectifier DN connected between the first rear terminal YN of its supply stage EN and one of the two electrodes of this capacitor. This electrode constitutes a "protected" electrode 14.
  • the charging means 2, 4 charge a said power supply unit such as BK by charging in parallel the storage capacitors C1 ... CN of the successive power supply stages E1 ... EN of this block. Each of these capacitors is charged through a charge protection rectifier GN connected to its protected electrode 14.
  • each of the power supplies B1 ... BK is fitted with a load inductace LS1 ... LSK which may or may not be saturable.
  • the charging means 2, 4 charge this block through this charge inductor.
  • the pulse widths of the blocks B1 ... BK which correspond to these segments decrease when the rank of these segments increases.
  • At least some of the power supplies of the segments B1 ... BK have the same pulse width.
  • the track segments S1 ... SK corresponding to these blocks then have lengths which increase with the rank of these segments.
  • the preceding description shows, taking into account the use of a pre-launcher, that the only switching device used is the power-up switch 4. It can be operated between each shot or only between each shot campaign ( in case of bursts of fire). Load inductors, saturable such as inductors LS1 ... LSK, or unsaturable, can be dimensioned according to the shortest time interval between two shots.
  • the switch 4 can be of any type, manual, electromagnetic control (the case shown in the diagram), or static (in this case, in any case, provide an isolation switch).
  • a preferred model has the particularity of using the through current as assistance in closing.
  • the structure of the power supplies makes it possible to reduce the amount of energy present at the terminals of a rail segment.
  • the structure of the power supply units is therefore perfectly suited to establishing a pulse by bringing the rails into contact with the armature of the projectile.
  • the present invention applies to any power supply unit generating an energy discharge pulse of amplitude less than a critical voltage at which appears a risk of creation of a parasitic arc, this critical voltage being a function the spacing of the barrel rails.
  • This type of power supply unit corresponds in particular to a duration proportional to that of the transit time of a projectile on a rail segment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Plasma Technology (AREA)
EP91402558A 1990-09-27 1991-09-25 Canon électromagnétique à rails Withdrawn EP0478452A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9011942A FR2667388A1 (fr) 1990-09-27 1990-09-27 Canon electromagnetique a rails.
FR9011942 1990-09-27

Publications (1)

Publication Number Publication Date
EP0478452A1 true EP0478452A1 (fr) 1992-04-01

Family

ID=9400719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91402558A Withdrawn EP0478452A1 (fr) 1990-09-27 1991-09-25 Canon électromagnétique à rails

Country Status (2)

Country Link
EP (1) EP0478452A1 (enrdf_load_stackoverflow)
FR (1) FR2667388A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756985A1 (fr) * 1996-12-05 1998-06-12 France Etat Dispositif electromagnetique permettant d'accelerer un mobile
CN107860263A (zh) * 2017-11-24 2018-03-30 广东交通职业技术学院 一种用于发射装置的动力系统及发射装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178833A (en) * 1936-07-30 1939-11-07 Union Carbide & Carbon Res Lab Apparatus for producing hydrogennitrogen mixtures
US4319168A (en) * 1980-01-28 1982-03-09 Westinghouse Electric Corp. Multistage electromagnetic accelerator
US4343223A (en) * 1980-05-23 1982-08-10 The United States Of America As Represented By The United States Department Of Energy Multiple stage railgun

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4706542A (en) * 1985-08-05 1987-11-17 The United States Of America As Represented By The United States Department Of Energy Low voltage arc formation in railguns

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178833A (en) * 1936-07-30 1939-11-07 Union Carbide & Carbon Res Lab Apparatus for producing hydrogennitrogen mixtures
US4319168A (en) * 1980-01-28 1982-03-09 Westinghouse Electric Corp. Multistage electromagnetic accelerator
US4343223A (en) * 1980-05-23 1982-08-10 The United States Of America As Represented By The United States Department Of Energy Multiple stage railgun

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756985A1 (fr) * 1996-12-05 1998-06-12 France Etat Dispositif electromagnetique permettant d'accelerer un mobile
EP0928944A1 (fr) * 1996-12-05 1999-07-14 Etat-Francais représenté par le Délégué Général pour L'Armement Dispositif électromagnétique permettant d'accélérer un mobile
CN107860263A (zh) * 2017-11-24 2018-03-30 广东交通职业技术学院 一种用于发射装置的动力系统及发射装置

Also Published As

Publication number Publication date
FR2667388A1 (fr) 1992-04-03
FR2667388B1 (enrdf_load_stackoverflow) 1994-08-19

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