JPH0533678U - Rail gun - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a railgun with a power supply that efficiently accelerates flying objects and prevents rail damage. [Construction] In a rail gun which supplies currents to parallel rails 1 and 1a to launch a projectile 2 provided between the rails, a starting current that rises rapidly increases from a starting current to a final velocity current, and then falls rapidly. A power supply device for supplying current, that is, a series coil 3 and a parallel capacitor 4 group is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a railgun that efficiently launches a flying object.

[0002]

[Prior Art]

 An electromagnetic launching device (hereinafter referred to as a rail gun) for accelerating a flying object at an ultrahigh speed by an electromagnetic force has a configuration as schematically shown in FIG.

That is, a flying body 2 that can slide along the conductor rails 1 and 1a is installed between the two conductor rails 1 and 1a. Immediately after the flying object 2 is an armature 8 made of solid or plasma. When the current 7 of the capacitor 4 is supplied from one end of the rails 1 and 1a, the current 7 flows as shown by the arrow in the figure. The magnetic field 6 created by the current 7 flowing through the rail at the armature 8 and the electromagnetic force 9 generated by the current 7 flowing through the armature 8 from the top to the bottom of the drawing to generate plasma act on the armature 8 and push the projectile 2. It is a mechanism to accelerate.

The current waveform in the conventional railgun is a capacitor discharge waveform having a peak in the initial stage, as conceptually shown in FIG. There is also a square wave type as shown in FIG. 6 in order to make the propulsive force of the flying object constant.

[0005]

[Problems to be solved by the device]

 In the conventional rail gun, when the flying object velocity is slow, the portion of the rail facing the plasma existing between the rails becomes long in time. Therefore, the rails are easily damaged by the heat of the plasma.

In the conventional capacitor discharge waveform, the maximum current flows in the initial acceleration stage where the flying body does not get a sufficient velocity. As a result, the projectile gained the maximum thrust, but the rail was exposed to high-temperature plasma and was damaged mainly in that part, resulting in the problem that repeated or continuous firing was impossible.

[0007]

[Means for Solving the Problems]

 The present invention takes the following means to solve the above problems.

That is, as a railgun, in a railgun that supplies current to parallel rails and launches a flying object provided between the rails, the starting current that rises rapidly increases gradually from the final velocity current, and then rapidly increases. Provide a power supply that supplies a falling current.

[0009]

[Action]

 In the above means, a starting current that rises rapidly flows behind the flying body of the rail, a magnetic field is generated, and the flying body is started by the electromagnetic force. After that, a magnetic field is generated by the gradually increasing current. With this magnetic field, the electromagnetic force gradually increases and the flying body accelerates. At the velocity at which the flying object leaves the rail, that is, at the final velocity, a final velocity current flows, and then it rapidly falls.

In this way, the flying body is efficiently accelerated and launched. In addition, the exposure time to the plasma of each part of the rail is shortened, and the damage to the rail is greatly reduced.

[0011]

【Example】

 (1) A first embodiment of the present invention will be described with reference to FIGS. The parts described in the conventional example are given the same numbers to avoid redundancy, and therefore the description thereof is omitted, and the parts related to the present invention will be mainly described.

In FIG. 1, the base end of the rail 1a is connected to the ground line. The base end of the rail 1a is connected to a ground line through a switch 10 and a plurality of coils 3 connected in series, and then via a capacitor. Further, each coil 3 is connected to a ground line via a capacitor 4. These are the power supply means.

In the above, when the switch 10 is turned on after each capacitor 4 is charged, a start-up current that sharply rises as shown in FIG. It flows to an armature (not shown) electrically connected to the rail near the rear of the flying object 2. This current causes the armature to become plasma, and the Lorentz force causes the projectile 2 to slide at high speed along the rails 1 and 1a in the direction of the arrow.

At this time, the larger the number of capacitors 4 and coils 3, the smoother the current waveform. The time T _END from the arrival (final) speed and the length of the rails 1 and 1a to the ejection of the projectile 2 can be estimated. When the time constant T _END , the inductance of the coil 3, and the discharge time constant obtained from the electrostatic capacity of the capacitor 4 are made to coincide with each other, the timing of ejection of the flying object 2 and the timing of termination of discharge can be matched.

Since it is not always accelerated as calculated due to the influence of friction and the like, it is necessary to feed back the circuit constant and the charging voltage for each experiment and select the optimum value suitable for the purpose of use. (2) A second embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, the base end of the rail 1a is connected to the ground line. The base end of the rail 1 is connected to a ground line via a capacitor 4 after a plurality of switches 5 are connected in series. Further, each switch 5 is connected to the earth line via the capacitor 4. Each switch 5 is turned on by a control signal.

Position detecting sensors 10 for the plurality of flying objects 2 are provided along the rails 1 and 1a. The output of each detection sensor 10 is connected to the control signal terminal of the switch 5, respectively. At this time, the detection sensor 10 and the switch 5 are numbered from the base end side of the rail to the tip end side, and are connected in the corresponding order.

In the above, when each of the capacitors 4 is charged with a predetermined electric charge and the flying body 2 is set on the base of the rails 1 and 1a, the detection sensors 5 sequentially detect the position of the flying body 2. Then, a signal is sent to the corresponding switch 5. Then, the switches 5 are sequentially turned on, a current as shown in FIG. 3 flows, and the projectile 2 is efficiently accelerated and fired.

At this time, the greater the number of capacitors 4 and switches 3, the smoother the current waveform. Further, it is necessary to adjust the electrostatic capacity and the charging voltage and feed back the experimental results as in the case of the first embodiment to select the optimum value that gives the current as shown in FIG.

In the first and second embodiments, the optimum current values are the rail material, the number of times the rail is used, the initial velocity and final velocity of the flying body, the rail gun body, the mechanical strength of the flying body, the property of plasma, etc. It is decided by.

[0021]

[Effect of the device]

 As explained above, the current flowing in the rail is designed to rapidly rise in the initial stage, then gradually increase, and then fall rapidly, so that the flying body accelerates and passes in a short time, and the rail is locally exposed to high-temperature plasma. Never. Therefore, thermal damage can be avoided and repeated firing or continuous firing becomes possible. It is also effective in terms of cost, maintenance, and energy efficiency.

[Brief description of drawings]

FIG. 1 is a configuration circuit diagram of a first embodiment of the present invention.

FIG. 2 is a configuration circuit diagram of a second embodiment of the present invention.

FIG. 3 is an operation explanatory view of the first and second embodiments.

FIG. 4 is a configuration diagram of a conventional example.

FIG. 5 is an operation explanatory view of the conventional example.

FIG. 6 is an explanatory view of the operation of the conventional example.

[Explanation of symbols]

 1, 1a Rail 2 Flying object 3 Coil 4 Capacitor 5, 10 Switch 6 Magnetic field 7 Current 8 Armature 9 Electromagnetic force 10 Sensor

Claims (1)

[Scope of utility model registration request] 1. In a rail gun for supplying a current to parallel rails to launch a projectile provided between the rails, a starting current rapidly rising to a final speed current is gradually increased,
A railgun characterized by comprising power supply means for supplying a current that rapidly falls thereafter.