JPH0421375A - Explosive compound generator - Google Patents

Abstract

PURPOSE:To achieve high generation efficiency by gradually decreasing the number of turn per unit length of a winding, constituting a stator, in the axial direction toward the side opposite to a detonator thereby eliminating inflection point of output current. CONSTITUTION:A winding 30A forming a stator 30 has a cross section in which the width W of conductor in the axial direction is constant and the insulation gap D between turns increases gradually toward a load 7 side. Consequently, the number of turn per unit axial length decreases and the inductance per unit length decreases as the winding 30A advances toward the load 7. In other words, the inductance decreases as a detonator face approaches the load 7 side. According to such arrangement, inflection point of output current at the joint of winding is eliminated resulting in high generation efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a large current pulse generator on the order of megaamperes used in electromagnetic accelerators, electromagnetic forming devices, etc., particularly for converting explosive energy of explosives into large current. Concerning explosive generators.

[Prior Art] FIGS. 6 and 7 are perspective views of an explosive generator before and during operation, respectively, to explain the power generation principle.

Figure 6 shows an armature 1 made of a cylinder made of a metal with good conductivity such as copper,
A stator 3 made of a metal with good conductivity, such as copper, is made of a winding wire wound in a single layer in the axial direction of the armature 1 so as to form a cylindrical gap 2 between the stator 3 and the armature I. The explosive 4 to be loaded into the hollow part, the detonator 5 to be inserted into one end of the hollow part of the armature 1 so as to come into contact with the explosive 4, and the detonator 5 to be inserted into one end of the hollow part of the armature 1 and the stator 3 on the detonator 5 side. Initial current source 6 connected in parallel
and a load 7 connected in parallel to the armature I and the end of the stator 3 on the detonator side.

FIG. 7 shows the explosion of the explosive 4 being propagated after detonation, and the armature 1 expands to the outside diameter side due to the detonation wave 8, and the stator is crushed from the detonator 5 side while crushing the cavity 2. 3 and crimping (hereinafter referred to as explosive bonding). As the detonation wave 8 develops, this explosion contact surface 9 moves toward the load 7 side, and finally the armature 1 and the stator 3 completely explode.

The principle of explosive power generation is explained below.

In FIG. 6, immediately before detonating the detonator 5, an initial current 10 of 10 is caused to flow from an initial current source 6 through the armature 1, the load 7, and the stator 3, and a magnetic field (total magnetic flux When the detonator 5 is detonated after the formation of the detonator 5, the detonation wave 8 causes the detonation surface 9 to move at almost the same speed as the propagation speed of the explosion (approximately 9+n/s). It progresses to the load 7 side. Since the detonation surface 9 develops extremely quickly, even if the gap 2 is crushed, the magnetic flux inside the gap 2 cannot leak out to the outside, and the value of the magnetic flux φ is maintained as it is.

In other words, the inductance when the initial current 10 flowing before detonation creates a reciprocating circuit between the armature 1 and the stator 3 is LO
Then, φ−ri. It can be expressed as Io (1), and the inductance between the armature 1 and stator 3 after detonation is Ll. At this time, the pressure current 1 flowing through the load 7
Letting the value of 1 be ■, then φ−L−■(2) is also obtained. Therefore, if we assume that equation (1) and (2) are equal, then 1/1. -LO/L (3). As the detonation surface 9 advances toward the load 7 side, the gap 2 is submerged and the lengthwise distance of the remaining gap 2 decreases, so the inductance L decreases and the magnetic field inside the gap 2 becomes stronger. Therefore, according to equation (3), the output current 11 increases. This output current 11 flows in a closed loop formed by the armature 1, load 7, and stator 3 via the explosion surface 9, and the ratio of the output current 11 and the initial current 10 in equation (3) is 1/I0 corresponds to the current amplification factor, and the larger this is, the higher the power generation efficiency of the explosive generator. Although the example shown in FIG. 6 is a case in which the stator 3 is composed of a winding, power generation can be performed using the same principle even when the stator 3 is composed of a cylinder made of a metal with good conductivity such as copper.

In such explosive power generation, the initial inductance created by armature l and stator 3 is The larger the current amplification factor is, and the more rapidly the inductance decreases due to explosion bonding, the larger the current amplification factor becomes. The value of inductance is on the order of microhenries (μH) when the stator 3 has a wire-wound structure, and on the order of nanohenries (nH) when it has a cylindrical structure.
The former winding structure is about three orders of magnitude larger. Therefore, if the stator 3 has a wire-wound structure, the current amplification factor will be larger for the same load 7. In addition, the time course in which the current is amplified is such that the current amplification factor is small at the initial stage of detonation and its increase is relatively slow, but as the detonation surface 9 develops, the current amplification factor gradually increases. When the magnetic flux 9 reaches the terminal end and the gap 2 is almost completely crushed, the magnetic flux is extremely concentrated and the inductance becomes almost zero, and the current amplification factor reaches its maximum value due to the rapid increase in current.

FIG. 8 is a cross-sectional view of a main part showing an example of the configuration of a conventional explosive generator. The armature 1 is made of a cylinder, and the armature 1 is supported through an insulating gap material 12 made of plastic or the like provided at both ends of the armature 1. The windings 3A and 3B are wound in a single layer in the axial direction of the armature 1 so as to form a cylindrical gap 2 between the windings 3A and 3B.
and a stator 35 consisting of three stages of cylindrical portions 3C disposed coaxially with the armature l, a support insulator 13 that reinforces the stator 35 from the outer diameter side, and explosives loaded into the hollow part of the armature l. 4, a detonator 5 that is inserted into one side of the hollow part of the armature l via an insulating plate 14 so as to come into contact with the explosive 4, and an end of the armature 1 and stator 35 on the detonator 5 side. It consists of an initial current source 6 connected in parallel, and a load 7 connected in parallel to the ends of the armature 1 and stator 35 on the anti-detonator side.

Note that the insulating support 13 is made of, for example, FRP (glass fiber reinforced plastics), and plays the role of fixing the stator 35 and supporting the electromagnetic mechanical force generated in the stator 35 through which a large current flows.

In this example, the stator 35 is composed of three parts: windings 3A and 3B, and a cylindrical part 3C, each of which has a threaded part 15 provided at its end.
A is connected by a conductive metal ring 15 having a mating screw on the inside. The reason why the stator 35 is configured in three stages is to increase the initial inductance, and as the collapse of the cavity 2 progresses, the inductance rapidly decreases, thereby significantly increasing the current amplification factor. . That is, the number of turns per unit length of the first stage winding 3 is twice that of the second stage winding 3B, and therefore the inductance of the winding 3B is equal to that of the winding 3A. Approximately 174. Furthermore, since the third stage is a cylindrical portion 3C, the inductance is reduced to about 1/1000 of that of the winding 3B in the previous stage.

FIG. 9 is a characteristic diagram showing the current amplification factor of the explosive generator, where time t on the horizontal axis is the elapsed time after detonation, and the current amplification factor on the vertical axis is the value I of the output current 11 and the initial current IO. The characteristic curve 1B (solid line), which shows the ratio of the value 1o to the value 1o, by its logarithm, corresponds to the characteristic of the conventional device shown in FIG. Times tl and t2 are the times when the explosive bonding surface 9 passes through the metal ring 15 section, that is, the joint between the winding 3A and the winding 3B, and the joint between the winding 3B and the cylindrical part 3C, and the time t3 is This is the time when the detonation surface 9 reaches the terminal end of the cylindrical portion 3C.

By configuring the stator 35 in three stages as in the configuration shown in FIG. 8, it is possible to obtain an output current that is amplified by about 2 products of the initial current. For example, if the initial current is several KA, the output current is on the order of HA. is obtained.

[Problems to be Solved by the Invention] However, in the conventional device as described above, the stator 35
Since they are coupled in multiple stages, an inflection point occurs in the output current at the coupling section of each stage, which hinders an increase in the current amplification factor.

That is, in FIG. 9, the increase in the current amplification factor slows down at times tl and t2, so there is a limit to the overall power generation efficiency that can be obtained. The cause of this inflection point is the winding 3
Since the metal ring 15, which serves as a current conduction path at the joint between ^ and 3B, has a cylindrical shape, the inductance becomes small at this joint, and then when it enters the winding 3B, the inductance increases, so the current amplification factor increases. decreases momentarily. At the joint between the winding 3B and the cylindrical part 3c, the cylindrical part 3
This is because the inductance of C is orders of magnitude smaller than that of winding 3B, so the current amplification factor after time t2 becomes gentle.

Furthermore, when the stator 35 in the conventional device has a wire-wound structure, dielectric breakdown easily occurs between turns of the winding, and the actual inductance value becomes smaller than the designed value. In other words, when the current amplification factor increases and the output current increases,
The voltage generated between winding turns increases. On the other hand, when the armature 1 and the stator 35 are detonated by the detonation wave 8, the gas near the welding surface in the cavity 2 becomes plasma due to high pressure and high temperature (ionized into positive and negative ions). It appears that gas molecules are mixed and conductive, and the dielectric strength between the turns of the winding in the gap 2 is extremely reduced.

For this reason, the turns of the winding tend to cause dielectric breakdown and are connected by conductive arcs, which equivalently reduces the inductance of the winding. Therefore, the initial inductance becomes smaller than the designed value, which causes a decrease in the obtained current amplification factor.

Furthermore, conventional devices have the disadvantage that the current amplification factor obtained varies to some extent from device to device even when the structure is the same. The reason for this is that when the armature 1 expands in the circumferential direction of the cylinder due to the explosion of the explosive 4 loaded in this hollow part, the cylinder of the armature does not expand uniformly. This is because the formation of the explosive bonding surface 9 with the magnetic flux 35 does not proceed smoothly, resulting in an unstable effect on the compression process of the captured magnetic flux.

An object of the present invention is to provide a device that has high power generation efficiency by eliminating inflection points in the output current and has a stable current amplification factor.

Means for Solving Problem C] Among the above problems, in order to prevent a decrease in power generation efficiency due to the occurrence of an inflection point in the output current, according to the present invention, an armature made of a cylinder made of a good metal conductor, and both ends of this armature are provided. Fixing a metal good conductor consisting of a winding wire supported through an insulating gap material disposed in the armature and wound in a single layer in the axial direction of the armature so as to form a cylindrical gap between the metal conductor and the armature. a support insulator for reinforcing the stator from the outer diameter side; an explosive to be loaded into the hollow part of the armature; and a supporting insulator to be fitted into one end of the hollow part of the armature so as to come into contact with the explosive. a load consisting of a detonator and an initial current source connected in parallel to ends of the armature and stator on the detonator side, and connected in parallel to ends of the stator and armature on the anti-detonator side; An initial current is passed in advance through the stator and armature, and the detonator is detonated with a magnetic field formed in the gap, and the detonation wave of the explosive crushes the gap and displaces the magnetic field. The device is configured such that the number of turns per unit length in the axial direction gradually decreases as the winding forming the stator advances toward the anti-detonator side. shall be

In addition, in order to prevent a decrease in power generation efficiency due to dielectric breakdown between turns of the winding, according to the present invention, an armature made of a cylindrical metal conductor and an insulating gap material provided at both ends of the armature are used. a stator made of a metal good conductor and consisting of a winding wire wound in a single layer in the axial direction of the armature so as to form a cylindrical gap between the stator and the armature; a support insulator reinforced from the side; an explosive to be loaded into the hollow part of the armature; a detonator to be fitted into one end of the hollow part of the armature so as to come into contact with the explosive; and the armature and a fixing device. an initial current source connected in parallel to the end of the armature on the detonator side, and an initial current source connected in parallel to the end of the stator and the armature on the detonator side; An initial current is passed in advance through the stator and armature to a load connected in parallel to the ends of the stator and armature on the anti-detonator side, and the detonator is activated with a magnetic field formed in the gap. Insulating gaps between turns of windings constituting a stator, in which the explosive is detonated and the detonation wave of the explosive collapses the gap, concentrating and intensifying the magnetic field and amplifying the initial current flowing to the load. An exhaust hole that penetrates the support insulator and communicates the cavity and the external space is provided in the part.

Furthermore, in order to prevent variations in the current amplification factor due to non-uniform expansion of the armature, according to the present invention, the armature is made of a cylindrical metal conductor and is supported via an insulating gap material provided at both ends of the armature. A stator made of a metal good conductor and consisting of a winding wound in a single layer in the axial direction of the armature so as to form a cylindrical gap between the stator and the armature, or a cylinder arranged coaxially with the armature. a supporting insulator for reinforcing the stator from the outer diameter side; an explosive to be loaded into the hollow part of the armature; and a detonator to be inserted into one end of the hollow part of the armature so as to come into contact with the explosive. an initial current source connected in parallel to the detonator-side ends of the armature and stator, and connected in parallel to the detonator-side ends of the stator and armature; An initial current is passed in advance through the stator and armature, and the detonator is detonated with a magnetic field formed in the gap, and the detonation wave of the explosive crushes the gap and displaces the magnetic field. In the device for concentrating and intensifying the initial current flowing to the load, a cylindrical insulating rod having an outer diameter smaller than the inner diameter of a cylinder forming the armature and a length approximately equal to the total length of the armature is used. The armature is coaxially arranged at the center of the hollow part of the armature so as to be buried in the explosive, and the explosive is loaded with a predetermined gap between one end of the insulating rod and the part facing the detonator. shall be.

[Function] According to the configuration of the present invention, the stator is configured such that the number of windings per unit length in the axial direction gradually decreases as the winding forming the stator advances toward the anti-detonator side. , the initial inductance increases, and the number of turns per unit length decreases continuously as the bonding surface progresses, so there is no longer a need for a joint between the windings as in conventional devices.
Since there is no inflection point in the output current, a high current amplification factor can be obtained.

In addition, by providing an exhaust hole in the insulation gap between the turns of the winding that makes up the stator, which penetrates the support insulator and communicates the gap with the outside space, the plasma gas generated near the welding surface can be removed. Since the air is exhausted to the outside space through the exhaust hole, it is possible to prevent the dielectric strength from decreasing between turns of the winding, so that the inductance of the winding does not decrease in an equal manner, and the current amplification factor can be increased.

Furthermore, a cylindrical insulating rod having an outer diameter smaller than the inner diameter of the cylinder forming the armature and a length approximately equal to the total length of the armature is placed coaxially at the center of the hollow part of the armature so as to be buried within the explosive. By keeping a predetermined gap between one end of the insulating rod and the part facing the detonator and loading the explosive, the explosive is loaded in a cylindrical shape within the armature, so the explosion area of the explosive forms the armature. Since the explosive force is generated only near the inner wall surface of the cylinder, the explosive force is uniform over the circumferential direction of the cylinder that forms the armature, and the explosion between the stator and armature occurs smoothly over the entire surface, resulting in a stable current amplification factor. can get.

[Example] The present invention will be explained below based on examples.

FIG. 1 is a sectional view of a main part of a device according to an embodiment of the present invention, in which a winding 30A forming a stator 30 has a constant cross section with an axial conductor width W, and turns as it winds toward a load 7. The structure is such that the insulation gap between them gradually increases. Note that detailed explanations will be omitted by using the same reference numerals for the same parts as in the conventional device.

By configuring the stator 30 in this way, the winding 3
As 0A winds toward the load 7 side, the number of turns per unit length in the axial direction decreases, and the inductance per unit length gradually decreases. Therefore, the inductance rapidly decreases as the explosive bonding surface moves toward the load 7 side. In addition, in conventional devices, the stator is composed of several stages, and each stage has a constant inductance per unit length (W and D).
However, this invention eliminates this inflection point and provides a high current amplification factor.

FIG. 2 is a sectional view of a main part of a device according to a different embodiment of the present invention, in which a winding 31A forming a solid element 31 is connected to a load 7.
The cross section is such that the conductor width W in the axial direction gradually increases as it winds toward the side, and the insulation gap between turns is constant. By configuring the stator 31 in this manner, as the winding 31A winds toward the load 7 side, the number of turns per unit length in the axial direction decreases, and the inductance per unit length gradually decreases.

FIG. 3 is a sectional view of a main part of a device according to yet another embodiment of the present invention, in which the conductor width W in the axial direction gradually increases as the winding 32A forming the stator 2 winds toward the load 7. In addition to having a large cross section, the insulation gap between the turns also gradually increases. By configuring the stator 32 in this way, the winding 32A is
As the winding progresses toward the side, the number of windings per unit length in the axial direction decreases, and the inductance per unit length gradually decreases.

The degree of reduction in inductance per unit length in the embodiment of FIG. 3 is the greatest compared to the embodiments of FIGS. 1 and 2, and therefore a very high current amplification factor can be obtained. FIG. 9 shows a characteristic curve 17 (broken line) of the current amplification factor in the embodiment shown in FIG. Unlike conventional devices, there is no inflection point in the output current because there is no coupling part for the inductance, and the inductance also decreases to a greater degree at each point than in the conventional device, so the increase in output current over time is not observed. The ratio also increases, and high power generation efficiency can be obtained.

FIG. 4 is a sectional view of a main part of a device according to still another embodiment of the present invention, in which windings 33 constituting a stator 33
The insulation gap between the turns of A is provided with an exhaust hole 20 that penetrates the support insulator 130 and communicates the gap 2 with the external space 19.

For example, the exhaust holes 20 are arranged at six equal intervals on the circumference of the support insulator 130.
A plurality of through holes are arranged evenly distributed, such as 8 equally distributed.

FIG. 10 is a cross-sectional view of the main part showing the development of redness on the detonation surface 9 of the device shown in FIG.
Due to the high pressure and high temperature during crushing, plasma 21 is generated near the explosion contact surface 9 between the armature 1 and the winding 33A, so the exhaust hole 20 plays the role of exhausting this plasma 21 to the external space 19. . By exhausting the plasma 21, the dielectric strength between turns of the winding 33A is improved.

FIG. 9 shows a characteristic curve 18 (-dotted chain line) when the exhaust hole 20 in the embodiment of FIG. 4 is provided in each of the windings 3A and 3B of FIG. 8. Compared to the characteristic curve 16 without the exhaust hole 20, the rate of increase of the output current with respect to time is large, resulting in high power generation efficiency. This indicates that in the case of conventional devices, the initial equivalent inductance of the winding was reduced due to dielectric breakdown occurring between the turns of the winding.

FIG. 5 is a sectional view of a main part of a device according to a further different embodiment, in which a cylindrical insulating rod having an outer diameter smaller than the inner diameter of the cylinder formed by the armature 1 and a length almost equal to the total length of the armature 1 is shown. 22 is coaxially arranged at the center of the hollow part of the armature 1 so as to be buried in the explosive 40, and the opposing part between one end of the insulating rod 22 and the detonator 5 is provided with a gap larger than the inner diameter of the armature 1. It is constructed by maintaining G and loading 40 explosives.

Although the stator 34 in FIG. 5 shows an example of a cylindrical structure, it can also be applied to a case of a wire-wound structure. With this configuration, the explosive 40 is loaded in a cylindrical shape, so that the explosion area of the explosive 40 is only near the inner wall surface of the cylinder forming the armature 1, and the explosive force acts uniformly over the circumferential direction of the armature 1. It becomes like this. Therefore, the stator 34 and the armature I are bonded smoothly over the entire circumference, and a stable current amplification factor with little variation is obtained.

The gap G between the detonator 5 and the end face of the insulating rod 22 is such that a load is generated when the detonation wave 8 after detonation reaches the gap between the outer periphery of the insulating rod 22 and the cylindrical inner wall surface of the armature l. This is the dimension necessary to ensure uniform orientation in the lateral direction, and the gap G
The value of is required to be at least the inner diameter of the cylinder forming the armature 1.

[Effects of the Invention] As described above, this invention is constructed so that the number of windings per unit length in the axial direction gradually decreases as the winding forming the stator advances toward the anti-detonator side. However, this invention eliminates the inflection part in the output current at the joint of multiple stages of windings with different numbers of windings per unit length. can be provided.

In addition, by providing an exhaust hole in the insulation gap between the turns of the winding that makes up the stator to communicate the gap with the outside space, in the conventional device, insulation breakdown between the turns of the winding occurs and the initial equivalent However, since plasma is discharged by the exhaust hole according to the present invention, there is no dielectric breakdown between the turns of the winding, and the current amplification factor can be increased.

Further, a cylindrical insulating rod having an outer diameter smaller than the inner diameter of the cylinder forming the armature and a length approximately equal to the total length of the armature is coaxially arranged in the center of the hollow part of the armature so as to be embedded in the explosive, Since one end of the insulating rod and the part facing the detonator are loaded with explosives while maintaining a gap of a predetermined distance, a stable current amplification factor with little variation can be obtained, and the amount of loaded explosives is lower than that of conventional methods due to the accumulation of the insulating rods. This has the advantage of requiring less equipment.

[Brief explanation of the drawing]

Figures 1, 2, 3, 4, and 5 are sectional views of main parts of devices according to different embodiments of the present invention, and Figures 6 and 7 are power generation principles of an explosive generator. FIG. 8 is a cross-sectional view of main parts showing an example of the configuration of a conventional device, FIG. 9 is a characteristic diagram showing the current amplification factor of the device, and FIG. 10 is a perspective view of the device before and during operation. FIG. 5 is a sectional view of a main part showing the progress of the explosion bonding surface of the device shown in FIG. 4; l... Armature, 2... Gap, 3.30.31, 32.33, 34.35... Stator, 3A, 3B, 30A, 31A, 32A, 33A-...
Winding, 3c... Cylindrical part, 4.40... Explosive, 5...
Detonator, 6... Initial current source, 7... Load, Death...
Detonation wave, 9... Detonation surface, 10... Initial current, 11.
...Output current, 12...Insulating gap material, 13.130.
...Support insulator, 14...Insulating plate, 15...Metal ring, 15A...Threaded portion, 16...Characteristic curve of conventional device, 17...Device according to the embodiment of FIG. 3 Characteristic curve of, 18
...Characteristic curve of device with exhaust hole, 19...External space,
20--Exhaust hole, 21--Plasma, 22--Insulating rod.

Claims (6)

[Claims] (1) An armature made of a cylindrical metal conductor, and the armature supported through insulating gap materials provided at both ends of the armature so as to form a cylindrical gap between the armature and the armature. a stator made of a good metal conductor consisting of a single-layer winding in the axial direction of the armature; a support insulator that reinforces this stator from the outer diameter side; an explosive to be loaded into the hollow part of the armature; and this explosive. and an initial current source connected in parallel to the ends of the armature and stator on the detonator side, An initial current is passed in advance through the stator and armature to a load connected in parallel to the ends of the stator and armature on the anti-detonator side, and the detonator is activated with a magnetic field formed in the gap. When the explosive is detonated, the detonation wave of the explosive crushes the gap, concentrates and strengthens the magnetic field, and amplifies the initial current flowing to the load, with the winding forming the stator facing toward the anti-detonator side. An explosive generator characterized in that the number of windings per unit length in the axial direction gradually decreases as winding progresses. (2) In the device described in claim (1), the winding forming the stator has a cross section with a constant conductor width in the axial direction, and as it winds toward the anti-detonator side, the insulation gap between the turns of the winding gradually increases. An explosive generator configured to increase. (3) In the device according to claim (1), the winding forming the stator has a cross section such that the axial conductor width gradually increases as it winds toward the anti-detonator side, and insulation between turns of the winding is provided. An explosion generator characterized in that it is configured such that the gap is constant. (4) In the device according to claim (1), the winding forming the stator has a cross section such that the width of the axial conductor gradually increases as it winds toward the anti-detonator side, and the winding between turns of the winding. An explosion generator characterized in that the insulation gap is also configured to gradually increase. (5) A cylindrical armature made of a metal good conductor, and a cylindrical gap formed between the armature and the armature, which are supported through insulating gap materials provided at both ends of the armature. a stator made of a good metal conductor consisting of a single-layer winding in the axial direction of the armature; a support insulator that reinforces this stator from the outer diameter side; an explosive to be loaded into the hollow part of the armature; and this explosive. an initial current source connected in parallel to the ends of the armature and stator on the side of the detonator; an initial current source connected in parallel to the ends of the stator and the armature on the anti-detonator side; The detonator is detonated with an initial current flowing through the armature and the armature to form a magnetic field in the gap, and the detonation wave of the explosive crushes the gap and concentrates the magnetic field. In the device for amplifying the initial current flowing to the load, an exhaust hole is provided in an insulating gap between turns of a winding forming a stator, penetrating the support insulator and communicating the gap with an external space. An explosive generator characterized by the following: (6) An armature made of a cylindrical metal conductor, and the armature supported through insulating gap materials provided at both ends of the armature so as to form a cylindrical gap between the armature and the armature. a stator made of a metal good conductor made of a winding wound in a single layer in the axial direction of the armature or a cylinder arranged coaxially with the armature; a supporting insulator for reinforcing the stator from the outer diameter side; an explosive to be loaded into the hollow part, a detonator to be inserted into one end of the hollow part of the armature so as to come into contact with the explosive, and an explosive to be inserted in parallel to the ends of the armature and stator on the detonator side An initial current is caused to flow in advance through the stator and armature to a load connected in parallel to the ends of the stator and armature on the detonator side, and to flow into the gap. The detonator is detonated in a state where a magnetic field is formed, and the detonation wave of the explosive crushes the gap, concentrating and intensifying the magnetic field, and amplifying the initial current flowing to the load, wherein the armature A cylindrical insulating rod having an outer diameter smaller than the inner diameter of the cylinder forming the armature and having a length approximately equal to the total length of the armature is coaxially arranged at the center of the hollow part of the armature so as to be buried within the explosive; 2. An explosive power generator, wherein one end of the insulating rod and the detonator are loaded with the explosive while maintaining a predetermined gap between the opposite ends of the insulating rod and the detonator.