JPH0835795A - Electromagnetic rail gun with external coil - Google Patents

Abstract

PURPOSE:To perform automatic fire without needing rapid charging equipment and to launch an airframe at a high speed by a method wherein energy is transferred from a capacitor to an external coil, an armature is accelerated by energy accumulated at an external coil, and during the acceleration of the armature, the capacitor is charged. CONSTITUTION:After an interrail short-circuit switch 20 is turned ON, external coils 5 and 6 are excited by energy accumulated at a capacitor 12, and the energy is accumulated thereat, an armature 4 and an airframe M1 are fed between rails 2 and 3. Thereafter, when a discharge switch 13 is turned OFF, a charge switch 11 is turned ON, and a crowbar switch 14 is turned ON to release the rails 2 and 3 from a rail short-circuit plate 21, a high voltage is applied on an insulation layer 41, and the insulation layer 41 is insulated and ruptured. A current flows, the armature 4 is accelerated, and the armature 4, i.e., the airframe M1, is launched at a high speed. Further, in this case, before the armature 4 is flied out through a space between the rails 2 and 3, a subsequent armature 4 is fed and automatic fire is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic railgun with an external coil, and more particularly to an electromagnetic railgun with an external coil capable of continuously firing an armature.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view of an electromagnetic rail gun with an external coil described in Japanese Patent Laid-Open No. 4-64895.
In this electromagnetic rail gun 200 with an external coil, the DC power supply 10, the charging switch 11, and the capacitor 12 are connected in series to form a charging circuit. One end of the capacitor 12 is connected to one end of the first rail 2 via the discharge switch 13. A second rail 3 is installed parallel to the first rail 2. An armature 4 which is in contact with and slidable on the rails 2 and 3 is interposed between the rails 2 and 3. The armature 4 is integrated with the flying body M. The metal bodies 5 and 6 form an external coil. That is, the connecting wires 7, 7, ... Are connected in the order of the metal bodies 5a, 6a, 5b, 6b, 5c, 6c, 5d, 6d to form a three-turn external coil.
One end of the rail 3 is connected to the metal body 5a by a connecting wire 8.
Is connected to one end. Further, one end of the metal body 6c is connected to the other end of the capacitor 12.

When the charge switch 11 is turned off and the discharge switch 13 is turned on while the capacitor 12 is charged, the energy charged in the capacitor 12 causes the rail 2, armature 4, rail 3, external coil (metal body 5,
6), a current I flows, and due to an electromagnetic force (Lorentz force) that acts between the magnetic field generated by the current flowing through the rails 2 and 3 and the current flowing through the external coils (metal bodies 5, 6) and the current flowing through the armature 4. When the armature 4 receives the acceleration force, the armature 4
And the flying body M are accelerated and launched while sliding on the rails 2 and 3.

FIG. 6 is a block diagram of an electromagnetic railgun 300 with an external coil, which is an improved type of the electromagnetic railgun 200 with an external coil that is a continuous fire type. For example, the armature 4 ′ and the flying body M ′ loaded in the magazine are driven between the rails 2 and 3 at regular intervals by an air gun type initial accelerator 340.
When the armature 4 ′ and the flying body M ′ are detected by the passage sensor 335, the switch control device 330 causes the discharge switch 13 to operate.
Turn on. Therefore, the current I flows through the rail 2, the armature 4, the rail 3, and the external coils (metal bodies 5, 6) by the energy charged in the capacitor 12, and the armature 4 and the flying body M are accelerated. The switch control device 330 turns off the discharge switch 13 and turns on the charge switch 11 to charge the capacitor 12 before the next armature 4 ′ and the flying body M ′ are driven. As a result, the flying object M can be fired at regular intervals.

[0005]

Since the conventional electromagnetic railgun 200 with an external coil does not have a continuous shooting function, there is a problem that the projectile M cannot be continuously shot. On the other hand, the conventional electromagnetic railgun 300 with an external coil has a continuous shooting function, but since the capacitor 12 is charged every time the projectile M is fired, a rapid charging facility is used to shorten the firing interval. There is a problem that is required. Further, the current I rises from "0" each time the flying body M is fired, but the inductance of the external coils (metal bodies 5, 6) delays the rise of the current I, so that the armature 4 can be accelerated at once. As a result, there is a problem that the flying body M cannot be launched at a sufficiently high speed, or the melting damage of the rails 2 and 3 becomes large. Furthermore, the discharge switch 13 must be turned on at the timing of driving the armature 4'and the flying body M ', which causes a problem that the configuration becomes complicated.

Therefore, a first object of the present invention is to improve the electromagnetic function with an external coil, which is capable of continuous firing, does not require quick charging equipment, can accelerate the armature at a stroke, and reduces melting damage of the rail. To provide a railgun. A second object of the present invention is to provide an electromagnetic railgun with an external coil which is improved so that continuous shooting is possible only by driving an armature and a flying object between the rails.

[0007]

SUMMARY OF THE INVENTION In a first aspect, the invention comprises a first rail (2), a second rail (3),
An external coil (5, 6) for applying a magnetic field between the armature (4) which is in contact with and slidable with the first rail (2) and the second rail (3) and the rail (2, 3). And applying a current to the series circuit of the first rail (2), the armature (4) and the second rail (3), and
A current flows through the external coils (5, 6), a magnetic field generated by the current flowing through the rails (2, 3), a magnetic field generated by the current flowing through the external coils (5, 6), and a current flowing through the armature (4). In an electromagnetic rail gun with an external coil for accelerating the armature (4) while sliding on the rails (2, 3) by an electromagnetic force acting between, a DC power supply (10), a charging switch (11), a capacitor ( 1
2) is connected in series with a charging circuit, the capacitor (1
2), the discharge switch (13) and the external coil (5, 5)
6) and an inter-rail short-circuit switch (21) that contacts the first rail (2) and the second rail (3) and short-circuits between the rails, and an exciting circuit, the capacitor (12), A crowbar switch (14) connected in parallel to a series circuit of a discharge switch (13), and the charge switch (11), the discharge switch (13), the crowbar switch (14), and the rail-to-rail short-circuit switch (21). ) And a switch control circuit (30) for controlling
The switch control circuit (30) includes the charging switch (11) and the clover switch (1).
4) is turned off and the discharge switch (13) and the rail-to-rail short-circuit switch (21) are turned on to energize the external coil (5, 6) by the energy stored in the capacitor (12); The clover switch (14) is turned on and the rail-to-rail short-circuit switch (21) is turned off to cause a current to flow through the armature (4) by the energy stored in the external coils (5, 6). 4) an accelerating step for accelerating, a charging step for charging the capacitor (12) by turning on the charging switch (11) and turning off the discharging switch (13) in parallel with the accelerating step, and the external coil. When the energy stored in (5, 6) becomes small, the control step returns to the excitation step and repeats the excitation step and the subsequent steps. Performing the operation with to provide an electromagnetic rail gun (100) with an external coil, wherein.

In a second aspect, the invention provides a first rail (2), a second rail (3) and a contact with the first rail (2) and the second rail (3). And a slidable armature (4) and an external coil (5, 6) for applying a magnetic field between the rails (2, 3), the first rail (2) and the armature (4) ) And the second rail (3)
Current through the series circuit of the external coil (5,
6), an electromagnetic force acting between the magnetic field generated by the current flowing through the rails (2, 3) and the magnetic field generated by the current flowing through the external coils (5, 6) and the current flowing through the armature (4). In an electromagnetic rail gun with an external coil for accelerating the armature (4) while sliding on the rails (2, 3) by means of contacting with the first rail (2) and the second rail (3) At least one of the contact portions of the armature (4) is provided with an insulating layer (41) that can be dielectrically broken down by a voltage applied between the rails (2, 3) when the rails (2, 3) are not energized. At the same time, the armature (4) provided with the insulating layer (41) is supplied between the rails (2, 3), and the insulating layer (4) of the armature (4) is supplied.
An armature (4) provided with the next insulating layer (41) after the dielectric breakdown of (1) and current starts to flow and before the armature (4) jumps out between the rails (2, 3). There is provided an electromagnetic rail gun (100) with an external coil, which is provided with an armature continuous supply means for supplying between the rails (2, 3).

In a third aspect, the present invention comprises a first rail (2), a second rail (3) and a contact with the first rail (2) and the second rail (3). And a slidable armature (4) and an external coil (5, 6) for applying a magnetic field between the rails (2, 3), the first rail (2) and the armature (4) ) And the second rail (3)
Current through the series circuit of the external coil (5,
6), an electromagnetic force acting between the magnetic field generated by the current flowing through the rails (2, 3) and the magnetic field generated by the current flowing through the external coils (5, 6) and the current flowing through the armature (4). In an electromagnetic railgun with an external coil that accelerates the armature (4) while sliding on the rails (2, 3) by means of a DC power supply (10), a charging switch (11) and a capacitor (12) in series. Connected charging circuit, said capacitor (12) and discharge switch (13)
And the external coils (5, 6) and the first rail (2)
And an exciter circuit in which a rail-to-rail short-circuit switch (21) that contacts the second rail (3) to short-circuit between the rails is connected in series, the capacitor (12) and the discharge switch (1).
3) A crowbar switch (14) connected in parallel to the series circuit, and the charge switch (11), the discharge switch (13) and the crowbar switch (14).
And a switch control circuit (30) for controlling the rail short-circuit switch (21), the switch control circuit (30) turning off the charging switch (11) and the clover switch (14) and The discharge step (13) and the rail short-circuit switch (21) are turned on to excite the external coil (5, 6) with the energy charged in the capacitor (12), and the clover switch (14) is turned on. An accelerating step of turning on and turning off the rail-to-rail short-circuiting switch (21) to cause a current to flow through the armature (4) by the energy stored in the external coils (5, 6) to accelerate the armature (4). In parallel with this acceleration step, the charge switch (11) is turned on and the discharge switch (13) is turned off to turn on the capacitor. (12) is charged, and when the energy stored in the external coil (5, 6) is reduced, the operation returns to the excitation step and the control step of repeating the excitation step and subsequent steps is performed. Yes, when at least one of the contact portions of the armature (4) that comes into contact with the first rail (2) and the second rail (3) is not energized between the rails (2, 3), An insulating layer (41) that can be destroyed by a voltage applied between the rails (2, 3) is provided, and an armature (4) provided with the insulating layer (41) is provided between the rails (2) during the acceleration step. , 3), and before the armature (4) jumps out from between the rails (2, 3) after the insulating layer (41) of the armature (4) is dielectrically broken down and a current starts to accelerate. To the next An insulating layer (4
Provided is an electromagnetic railgun (100) with an external coil, which is provided with an armature continuous supply means for supplying an armature (4) provided with (1) between the rails (2, 3).

[0010]

In the electromagnetic rail gun (100) with an external coil according to the first aspect, the inter-rail short-circuit switch (21) is provided.
Is turned on to prevent current from flowing through the armature (4), and then the external coils (5, 6) are excited by the energy stored in the capacitor (12). When the external coils (5, 6) are sufficiently excited, the clover switch (14) is turned on and the inter-rail short-circuit switch (2) is turned on.
1) is turned off and a current is passed through the armature (4) to accelerate the armature (4) at once. At the same time, the discharge switch (1
3) is turned off, the charging switch (11) is turned on, and the capacitor (12) is charged. Therefore, the armature (4) is supplied between the rails (2, 3) at regular time intervals by an appropriate armature continuous supply means, and the clover switch (1
4) and the rail-to-rail short-circuit switch (21) are controlled to be turned on and off to enable continuous shooting. Then, since the capacitor (12) is charged in parallel with this continuous shooting, the quick charging equipment is not required. In addition, since the current flows through the armature (4) when the external coils (5, 6) are sufficiently excited, the armature (4) can be accelerated at a stroke. Further, since the armature (4) can be accelerated at a stroke, the current value can be made relatively small and the energization time can be shortened, so that melting damage of the rail is reduced.

The rail short-circuit switch (21) is
If the armature (4) is formed of a conductor having an electric resistance smaller than that of the conductor constituting the armature (4), the current flowing through the armature (4) will be completely or completely reduced when the inter-rail short-circuit switch (21) is turned on. Energy consumption is gone,
preferable.

In the electromagnetic railgun (100) with an external coil according to the second aspect, the contact portion of the armature (4) that contacts the rails (2, 3) is not energized between the rails (2, 3). An insulating layer (41) that can be dielectrically broken down by a voltage applied between the rails (2, 3) at that time is provided. When the armature (4) provided with the insulating layer (41) is supplied between the rails (2, 3) and a voltage is applied without energizing between the rails (2, 3), the insulating layer (41) is caused by the voltage. Is broken down, a current flows, and the armature (4) is accelerated. From this time, before the armature (4) jumps out between the rails (2, 3), an armature (4) provided with the following insulating layer (41).
Is supplied between the rails (2, 3). Then, while the accelerating armature (4) is between the rails (2, 3), the insulation layer (41) of the next armature (4) is not dielectrically broken down, so the next armature (4) Is stopped. However, when the accelerating armature (4) jumps out from between the rails (2, 3), the insulation layer (41) of the next armature (4) is dielectrically broken down, so that a current flows and is accelerated. become. Thus, by firing the armature (4) between the rails (2, 3), continuous shooting is possible.

Since the electromagnetic railgun (100) with an external coil according to the third aspect has both the configurations of the electromagnetic railgun with an external coil according to the first aspect and the second aspect, the armature (4) is provided. ) To the rail (2
3) Rapid firing is possible by only driving in between, rapid charging equipment is not required, the armature (4) can be accelerated at once, and melting damage to the rail is reduced.

[0014]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this. FIG. 1 is a perspective view of an essential part of an embodiment of an electromagnetic rail gun with an external coil according to the present invention. In this electromagnetic rail gun 100 with an external coil, a DC power supply 10, a charging switch 11 and a capacitor 12 are connected in series to form a charging circuit. The capacitor 12
One end of the first rail 2 via the discharge switch 13.
Is connected to one end. A second rail 3 is installed parallel to the first rail 2. The rail 2,
3 is made of a heat-resistant conductive material such as tungsten which is relatively hard to melt.

An armature 4 which is in contact with and slidable on the rails 2 and 3 is provided between the rails 2 and 3.
Supplied from The armature 4 is integrated with the flying body M, and is provided with an insulating layer 41 that can be dielectrically broken down by a voltage applied between the rails 2 and 3 when the rails 2 and 3 are not energized. The armature 4 is made of a conductive material that is more easily melted than the rails 2 and 3, and is, for example, semiconductor, aluminum, zinc, lead, tin or the like. The flying body M is made of a plastic material having good dimensional stability such as polycarbonate.
The insulating layer 41 is made of, for example, a plastic film or a plastic tape. The armature continuous supply device 4
0 is for pushing the armature 4 pushed up by a pushing device (40a) such as a spring between the rails (2, 3) by the pushing rod 40b.

The metal bodies 5 and 6 form an external coil. That is, the connecting wires 7, 7, ...
a, 5b, 6b, 5c, 6c, 5d, 6d are connected in this order to form a three-turn external coil. One end of the rail 3 is connected to one end of the metal body 5a by a connecting wire 8. Further, one end of the metal body 6c is connected to the other end of the capacitor 12. The metal body 5,
6 is, for example, aluminum, and it is preferable to use it in a state where it is cooled by a cooling means such as liquid nitrogen to reduce the electric resistance.

An inter-rail short-circuit plate 21 is in contact with one ends of the rails 2 and 3. This inter-rail short-circuit plate 21 is
It is made of a material having a resistance value lower than that of the armature 4, and is, for example, copper. This is also preferably used in a state where the electric resistance is lowered by cooling with a cooling means such as liquid nitrogen. The capacitor 12, the discharge switch 13, the rail short-circuit switch 21, and the external coils 5 and 6 form an exciting circuit. A crowbar switch 14 is connected in parallel to the series circuit of the capacitor 12 and the discharge switch 13.

FIG. 2 is an explanatory view of the main part of the electromagnetic rail gun 100 with an external coil, to which a control system is added. 20 is
The rail-to-rail short-circuit switch driving unit is configured to attract the spring 22 for pressing the rail-to-rail short-circuit plate 21 against one end of the rails 2 and 3 and the magnetic plate 21a attached to the rail-to-rail short-circuit plate 21 to draw a space between the rails. It is composed of an electromagnet 23 that separates the short-circuit plate 21 from one end of the rails 2, 3, a drive power supply 24 and a drive switch 25 that energize the electromagnet. The current detector 31 detects the current I flowing through the external coils (5, 6), and the charge switch 1
1, a discharge control device 13, a crowbar switch 14, and a drive switch 25.

FIG. 3 is a time chart of the operation of the electromagnetic rail gun 100 with an external coil. The description starts from time ta, but immediately before this time ta, the capacitor 12
Has been charged, and rails 2 and 3
It is assumed that the armature 4 and the flying body M1 are not supplied between them. At time ta, the charging switch 11 is turned off,
The discharge switch 13 is turned on, the clover switch 14 is turned off, and the rails 2 and 3 are short-circuited by the rail short-circuit plate 21 (the drive switch 25 is turned off). Then, the current I flows due to the energy accumulated in the capacitor 12, the external coils 5 and 6 are excited, and the external coils 5 and 6 are excited.
Energy is stored in. Armature continuous supply device 40
Immediately after the time ta, the first armature 4 and the flying body M
1 is supplied between the rails 2 and 3. At this time, the current I is
Since it flows through the inter-rail short-circuit plate 21 and does not flow into the armature 4, the armature 4 and the flying body M1 are not accelerated, and there is no energy loss (firing halt state). As shown in FIG.
Due to the inductance of the external coils (5, 6), the current I reaches the maximum value Ix at the time tb delayed from the time ta. The switch controller 30 monitors the current I by the current detector 31, and detects the time tb when the current I reaches the maximum value Ix (the time when the differential value of the current I reaches “0”).

At time tb, the charge switch 11 is turned on, the discharge switch 13 is turned off, and the clover switch 1 is turned on.
4 is turned on, and the rails 2 and 3 are released from the inter-rail short-circuit plate 21 (the drive switch 25 is turned on). Then, the current I tries to continue to flow due to the energy accumulated in the external coils 5 and 6, but since the armature 4 has the insulating layer 41, the current I does not flow and a large voltage is applied to the insulating layer 41. Takes. Therefore, the insulating layer 41 is dielectrically broken down. At this moment, the electric current I flows into the armature 4, and the armature 4 is accelerated at once by the electromagnetic force between the magnetic field between the rails 2 and 3 and the magnetic field of the external coils 5 and 6, and the flying body M1 moves at high speed (for example, about It is launched at 5 km / sec. Armature continuous supply device 4
0 is rail 2, after the flying body M1 starts to be accelerated.
Before jumping out from between 3, the next armature 4 and flying object M2
Is supplied between the rails 2 and 3. While the flying body M1 is between the rails 2 and 3, the voltage between the rails 2 and 3 is small,
The insulating layer 41 of the next armature 4 is not subject to dielectric breakdown, but when the flying body M1 jumps out from between the rails 2 and 3, the voltage between the rails 2 and 3 becomes large, and the insulating layer 4 of the next armature 4 becomes large.
1 is dielectrically destroyed. Therefore, the current I flows into the armature 4, the armature 4 is accelerated at once, and the flying body M2 is launched at high speed. By repeating this, the flying objects M1 to M
n will be fired continuously (continuous fire state). The flying body M
During continuous firing of 1 to Mn, the charging switch 1 is operated by the DC power source 10.
The capacitor 12 is charged via 1 and the capacitor 12
Energy is stored in. As shown in FIG. 4, energy is consumed by the continuous shooting of the flying objects M1 to Mn, so that the current I gradually decreases from time tb and reaches a predetermined value α · Ix (0 <α <1) at time tc. . The switch control device 30 monitors the current I by the current detector 31,
The time tc when the current I reaches the predetermined value α · Ix (the time when a current value α times the current value when the differential value of the current I becomes “0” is measured) is detected. At time tc, the armature continuous supply device 40 stops supplying the next armature 4 and the flying vehicle M between the rails 2 and 3. Therefore, the rails 2 and 3 are empty. This state is the same as that at the time ta. Therefore, the operation after the time ta is repeated.

The above electromagnetic rail gun 10 with an external coil
According to 0, it is possible to perform continuous shooting by supplying the armature 4 between the rails 2 and 3 without performing accurate timing adjustment. Therefore, it is hard to break down and is practical. In addition, since the capacitor 12 is charged during continuous shooting, quick charging equipment is not required. Further, since the current I provides the inter-rail short-circuit plate 21, the armature 4 and the flying body M can be accelerated at once by a strong electromagnetic force, and the flying body M can be launched at a sufficiently high speed. Moreover, since the time for which the armature 4 is energized is shortened, melting damage of the rails 2 and 3 can be reduced. In addition to the external coils 5 and 6, a coil for energy storage may be provided.

[0022]

According to the electromagnetic railgun with an external coil of the present invention, energy is transferred from the capacitor to the external coil, the armature is accelerated by the energy stored in the external coil, and the capacitor is charged during that time. It is possible to fire continuously even without. Further, since the current flows through the armature after the current flowing through the outer coil has sufficiently risen, even if the inductance of the outer coil is large, the armature can be accelerated at once by a strong electromagnetic force, and the projectile can be launched at high speed. . Also, since the time for which the armature is energized is shortened, melting damage of the rail is also reduced. Further, even if there is no accurate timing adjustment mechanism, it is possible to continuously fire by simply supplying the armature between the rails, and the configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a main part perspective view showing an embodiment of an electromagnetic rail gun with an external coil according to the present invention.

FIG. 2 is an explanatory view of a main part in which a control system is added to the electromagnetic rail gun with an external coil shown in FIG.

FIG. 3 is a time chart of the operation of the electromagnetic railgun with an external coil shown in FIG.

FIG. 4 is a graph showing changes in current flowing through the electromagnetic rail gun with the external coil shown in FIG. 1.

FIG. 5 is an explanatory view showing an example of a conventional electromagnetic rail gun with an external coil.

FIG. 6 is an explanatory diagram showing an example of a conventional continuous-fire electromagnetic rail gun with an external coil.

[Explanation of symbols]

 100 Electromagnetic rail gun with external coil 2,3 Rail 4 Armature 5,6 External coil (metal body) 10 DC power supply 11 Charge switch 12 Capacitor 13 Discharge switch 14 Clover switch 20 Rail short-circuit switch driver 21 Rail short-circuit board 21a Magnetic Body plate 22 Spring 23 Electromagnet 24 Drive power supply 25 Drive switch 30 Switch control device 31 Current detector 40 Armature continuous supply device

Claims (3)

[Claims] 1. A first rail (2), a second rail (3), and an armature (contactable and slidable on the first rail (2) and the second rail (3). 4) and the external coil (5, 5) that applies a magnetic field between the rails (2, 3).
6), a current flows through a series circuit of the first rail (2), the armature (4) and the second rail (3), and the external coil (5, 6) An electric current is applied to the rail (2, 3) by an electromagnetic force acting between a magnetic field generated by the current flowing through the rails (2, 3) and a magnetic field generated by the current flowing through the external coils (5, 6) and a current flowing through the armature (4). The armature (4) while sliding on (2, 3)
In an electromagnetic railgun with an external coil for accelerating, a charging circuit in which a DC power supply (10), a charging switch (11) and a capacitor (12) are connected in series, the capacitor (12), a discharging switch (13) and the external coil An exciting circuit in which (5, 6) and an inter-rail short-circuit switch (21) that contacts the first rail (2) and the second rail (3) and short-circuits between the rails are connected in series, the capacitor ( 12) and a discharge switch (13) connected in parallel to a series circuit of a clover switch (14), and
The charge switch (11) and the discharge switch (13)
And a switch control circuit (3) for controlling the clover switch (14) and the inter-rail short-circuit switch (21).
0), the switch control circuit (30) turns off the charge switch (11) and the clover switch (14) and turns on the discharge switch (13) and the rail-to-rail short-circuit switch (21). The condenser (12)
The external coil (5, 6) by the energy stored in
An exciting step for exciting the switch, turning on the clover switch (14), and switching the rail short-circuit switch (2).
1) is turned off and a current is passed through the armature (4) by the energy stored in the external coils (5, 6) to accelerate the armature (4), and the acceleration step is performed in parallel with the acceleration step. The charge switch (11) is turned on and the discharge switch (13) is turned off to turn on the capacitor (1).
2) a charging step of charging the external coil (5,
An electromagnetic railgun (100) with an external coil, characterized by performing an operation having a control step of returning to the excitation step when the energy stored in 6) becomes small and repeating the excitation step and thereafter. 2. A first rail (2), a second rail (3), and an armature (contactable and slidable on the first rail (2) and the second rail (3). 4) and the external coil (5, 5) that applies a magnetic field between the rails (2, 3).
6), a current flows through a series circuit of the first rail (2), the armature (4) and the second rail (3), and the external coil (5, 6) An electric current is applied to the rail (2, 3) by an electromagnetic force acting between a magnetic field generated by the current flowing through the rails (2, 3) and a magnetic field generated by the current flowing through the external coils (5, 6) and a current flowing through the armature (4). The armature (4) while sliding on (2, 3)
In an electromagnetic railgun with an external coil for accelerating energy, the first rail (2) and the second rail (3)
At least one of the contact portions of the armature (4) that comes into contact with
An armature provided with an insulating layer (41) that can be dielectrically broken down by a voltage applied between the rails (2, 3) when the rails (2, 3) are not energized. (4) is supplied between the rails (2, 3), and the insulating layer (4) of the armature (4) is supplied.
An armature (4) provided with the next insulating layer (41) after the dielectric breakdown of (1) and current starts to flow and before the armature (4) jumps out between the rails (2, 3). An electromagnetic rail gun (100) with an external coil, which is provided with an armature continuous supply means for supplying between the rails (2, 3). 3. A first rail (2), a second rail (3), and an armature (contactable and slidable on the first rail (2) and the second rail (3). 4) and the external coil (5, 5) that applies a magnetic field between the rails (2, 3).
6), a current flows through a series circuit of the first rail (2), the armature (4) and the second rail (3), and the external coil (5, 6) An electric current is applied to the rail (2, 3) by an electromagnetic force acting between a magnetic field generated by the current flowing through the rails (2, 3) and a magnetic field generated by the current flowing through the external coils (5, 6) and a current flowing through the armature (4). The armature (4) while sliding on (2, 3)
In an electromagnetic railgun with an external coil for accelerating, a charging circuit in which a DC power supply (10), a charging switch (11) and a capacitor (12) are connected in series, the capacitor (12), a discharging switch (13) and the external coil An exciting circuit in which (5, 6) and an inter-rail short-circuit switch (21) that contacts the first rail (2) and the second rail (3) and short-circuits between the rails are connected in series, the capacitor ( 12) and a discharge switch (13) connected in parallel to a series circuit of a clover switch (14), and
The charge switch (11) and the discharge switch (13)
And a switch control circuit (3) for controlling the clover switch (14) and the inter-rail short-circuit switch (21).
0), the switch control circuit (30) turns off the charge switch (11) and the clover switch (14) and turns on the discharge switch (13) and the rail-to-rail short-circuit switch (21). The condenser (12)
The external coil (5, 6) by the energy stored in
An exciting step for exciting the switch, turning on the clover switch (14), and switching the rail short-circuit switch (2).
1) is turned off and a current is passed through the armature (4) by the energy stored in the external coils (5, 6) to accelerate the armature (4), and the acceleration step is performed in parallel with the acceleration step. The charge switch (11) is turned on and the discharge switch (13) is turned off to turn on the capacitor (1).
2) a charging step of charging the external coil (5,
When the energy stored in 6) becomes small, the operation including the control step of returning to the excitation step and repeating the excitation step and the subsequent steps is performed, and the first rail (2) and the second rail (3)
At least one of the contact portions of the armature (4) that comes into contact with
An insulating layer (41) is provided that can be dielectrically broken down by a voltage applied between the rails (2, 3) when the rails (2, 3) are not energized, and the insulating layer (41) is provided during the acceleration step. The armature (4) provided with (41) is supplied between the rails (2, 3), and the insulation layer (41) of the armature (4) is dielectrically broken down, and a current flows and starts accelerating. Before (4) jumps out between the rails (2, 3), the next insulating layer (4
An electromagnetic railgun (100) with an external coil, comprising armature continuous supply means for supplying the armature (4) provided with 1) between the rails (2, 3).