JPS58142508A - High speed rotating disc type strong magnetic field generating device - Google Patents

Abstract

PURPOSE:To obtain a strong magnetic field generating device which is able to maintain and generate the continuous strong magnetic field of 20-30 tesla for several seconds by a method wherein two metallic rotating discs provided with a slit between both discs are closely arranged, also the same two metallic rotating discs having a slit which perpendicularly intersects with said slit are provided, while said discs are rotated at hith speed in the same direction, locating these slits between the N pole and the S pole of a magnet. CONSTITUTION:The first slit S1 is formed by arranging two metallic rotating disc 1 and disc 2 as each periphery part 1a and 2a are located to close each other on the same plane, also two metallic rotating disc 3 and disc 4 forming the second slit S2 which perpendicularly intersects with said slit S1 by similarly closely locating of the periphery 3a and 4a, are arranged under these disc 1 and disc 2, while a small hole H is formed in the axial direction of the disc 1-4. Then the hole H is located in the gap between the N pole and S pole of a direct current electromagnet 7, the direct current power supply is connected to the one of two coils wound around the magnet 7, thereby, the strong magnetic field is generated inside of the hole H.

Description

[Detailed description of the invention] The present invention relates to a device for generating strong magnetic fields.

In recent years, in order to investigate the properties of materials, research in so-called condensed matter science has been actively conducted under extreme conditions such as ultra-high temperatures, ultra-low temperatures, ultra-high pressures, ultra-vacuum, and ultra-strong magnetic fields.
Furthermore, various proposals have been made for means of creating such extreme conditions.

/' By the way, conventional p-strong magnetic field generation means include the following methods: the Quenelle method and the implosion method, which instantaneously generate a strong magnetic field, and the There are multilayer coil methods (Osaka University method) and MIT methods (Massachusetts Institute of Technology) that generate a magnetic field, and there is also a single conduction coil method that continuously generates a strong magnetic field.

As shown in Figure 1, the Quenelle method uses a charged capacitor bank C1 to flow a large current (approximately 1 million amperes) through a single-turn coil L1 through a switch SW1, and the electromagnetic force causes the internal liner (aluminum A method is used to compress tube a, thereby concentrating the magnetic flux inside liner a and instantaneously obtaining a strong magnetic field.

A strong magnetic field of about 2807 (Tesla) can be generated for only 1/100th of a second.

In addition, the implosion method uses capacitor bank C as shown in Figure 2.
2, the switch SW2 is closed, a current is passed through the coil L2 to generate magnetic flux, and then the gunpowder is detonated to concentrate the magnetic flux and instantaneously obtain a strong magnetic field. A strong magnetic field of about 3007° can be generated for only 1 second.

Furthermore, the multilayer coil method (Osaka University method) uses coils with unique shapes and nine dimensions for each layer to equalize the electromagnetic force acting on each layer, resulting in a non-destructive type with a current of several hundred thousand amperes. In this method, a relatively long pulsed strong magnetic field is obtained, and in this method,
A strong magnetic field of maximum value 100T can be obtained with a pulse width of 100 μs (microseconds).

Furthermore, the MIT method uses a specially shaped coil to obtain a strong magnetic field with a maximum value of 40T with a pulse width of 100 μS. Note that a continuous magnetic field can be obtained even with an ordinary iron-core electromagnet, but its maximum value is about several T.

Furthermore, the superconducting coil method is a method of passing a current through a superconducting coil to obtain a continuous and constant strong magnetic field, and currently, 15T
Although a strong magnetic field of about 17.27 is obtained, theoretically the upper limit is 17.27.

Figure 3 shows a graph comparing the strong magnetic fields obtained by each of the above methods.
indicates the characteristics obtained by the Quenelle method, B indicates the characteristics obtained by the implosion method, C indicates the characteristics obtained by the multilayer coil method, D indicates the characteristics obtained by the MIT method, and E indicates the characteristics obtained by the superconducting coil method. ing.

However, conventional means have the following various problems. In other words, in the Quenelle method and the implosion method, the maximum value is quite high, but the duration is extremely short, and there is also the problem that the coil and sample are destroyed every time a strong magnetic field is applied.

In addition, the multilayer coil method and the MIT method have various advantages such as relatively long pulse width and non-destructive properties, but depending on the research topic, the duration may be short and they may require a constant strong magnetic field. The problem is that it cannot be obtained.

Furthermore, although it is possible to obtain a continuous and constant strong magnetic field with the superconducting coil method, there is a problem in that it is not possible to obtain a strong magnetic field of 177 or more, although it requires large-scale equipment.

The present invention aims to solve these problems by converting the kinetic energy of a high-speed rotating disk into electromagnetic energy, which has been difficult to achieve up to now.
It is an object of the present invention to provide a high-speed rotating disk-type strong magnetic field generator that can sustain a constant strong magnetic field of T for several seconds or more and end with generation.

For this reason, the high speed rotating disk type strong magnetic field generator of the present invention,
A first rotating disk pair consisting of two metal rotating disks disposed with their peripheral edges close to each other to form a first slit on the same plane, and a first rotating disk pair consisting of two metal rotating disks disposed with their peripheral edges close to each other to form a first slit, and a first rotating disk pair consisting of two metal rotating disks disposed with their peripheral edges close to each other so as to form a first slit. a second rotating disk pair consisting of two metal rotating disks disposed with their peripheral edges close to each other so as to form a second slit in a direction perpendicular to the first slit on the level; A magnet is provided so that a small hole formed in the axial direction of the rotating disk by the first and second slits is interposed between the magnetic poles, and a magnetic field from the magnet is directed into the small hole. The present invention is characterized in that a driving device is provided that can drive each rotating disk in the first and second rotating disk pair to rotate at high speed in order to converge and generate a strong magnetic field.

Hereinafter, a high-speed rotating disk-type strong magnetic field generator as an embodiment of the present invention will be explained with reference to the drawings. FIG. 4 is a schematic diagram for explaining the arrangement of the first and second rotating disk pairs. , FIG. 5 is an explanatory diagram showing the overall schematic configuration with the #2 rotating disk pair omitted, FIG. 6 is an enlarged view showing the magnetic pole part with the second rotating disk pair omitted, and FIG. 7 is an enlarged view showing a part of the magnetic pole part in more detail, Figure 8 is a schematic diagram to explain its action, Figures 9 and 10 are graphs to explain its action, and Figure #11 is its A schematic diagram for explaining the principle, FIG. 12 is a schematic diagram showing the magnetic pole part enlarged to explain the action, and FIGS. 13(a) to (c)
are graphs for explaining their effects.

As shown in FIG.
Two metal rotating disks 1.2 are arranged on the same plane so that their peripheral edges 1a and 2m are close to each other, and these rotating disks 1.2 form a first rotating disk. versus 5
is configured.

Also, #2 in the direction perpendicular to the first slit) Sl)
In order to form These rotating disks 3 and 4 constitute a second rotating disk pair 6.

As a result, the first and second pairs of rotating disks 5, 6 are disposed perpendicularly and close to each other, and as a result, the path 1 and the second slits) Sl, S2 allow the rotating disks 1
A small hole H is formed in the axial direction of ~4.

As shown in FIG. 7, the peripheral edge 2a of the rotating disk 2 is made of steel as a highly conductive material, but the peripheral edges 1a, 3a, 4a of the other rotating disks 1, 3.4 are The same applies to

Further, other parts of the rotating disks 1 to 4 are made of iron material having sufficient mechanical strength.

By the way, as shown in Fig. 5.6, the DC electromagnet 7 is placed so that the small hole H is interposed between the gap between the magnetic poles N and S.
is provided.

A coil 7b is wound around a layered iron core (magnetic core) 7a of this electromagnet 7, and a DC power source E is connected to this coil 7b via a switch SW.

Furthermore, the opposing surfaces of the magnetic poles N and S have a spherical concave shape, and a sample insertion hole 8 is formed on the magnetic pole N side.

In addition, each of the rotating disks 1 to 5 of the first and second rotating disk pairs 5.6
A drive device 19 capable of driving the motor 4 to rotate at high speed is provided, and an induction motor is used as the drive device 9, for example.

Note that the rotation directions of the rotating disks 1 to 4 by the drive device 9 are as shown in FIGS. 4 to 6.

With the above-mentioned configuration, when the rotating disks 1 to 4 are rotated at high speed, the magnetic flux φ generated in the iron core 7a of the electromagnet 7 is shifted to the magnetic pole N as shown in FIG. In the S darkness, it converges into the small hall H,
A strong magnetic field can be generated in this small hole H, and the principle thereof will be explained below.

Now, to simplify the explanation, we will use one metal rotating disk (
The symbol 1 is given to represent this disk. ) will be explained below.

Now, as shown in FIG. 11, the magnetic pole N of the electromagnet 7 has opposing semicircular arc-shaped pole faces. Assuming that there is a disk 1 rotating at high speed between S and the switch SW is turned on in this state, a DC current i flows from the DC power source E, and the electromagnet 7 is excited, and the magnetic pole N is turned on. A magnetic flux φ is generated in the S-opening, and as a result, an eddy current flows through the rotating disc 1 and a braking force is generated.

However, in this case, if the peripheral velocity v (m/s) of the disk 1 between the magnetic poles N and S is sufficiently high, the magnetic flux generated by the eddy current in the disk 1 will move toward the magnetic pole N. The magnetic flux φ between S is opposite in direction and equal in magnitude, so the magnetic pole N.

The magnetic flux between 8 and 8 is no longer able to travel straight through the disc 1, but instead travels in a curved manner and passes outside the edge of the disc 1, as shown in FIG.

In such a state, the peripheral velocity v (m/s
) continues for a sufficiently high time, and when the speed decreases due to the braking force, the magnetic flux goes straight and penetrates the disc 1, and thereafter acts simply as a braking force. In other words, when the disk 1 rotates at high speed and has a large moment of inertia, the magnetic pole N remains for a considerable period of time.

The magnetic flux between S curves and continues to pass outside the edge of the disk 1.

If the dimensions 111n (see Fig. 8) of the magnetic poles N and S are changed appropriately, the amount of passing magnetic flux and braking force with respect to the peripheral velocity v (, /S) of the disk 1 will be as shown in Figs. 9 and 10, respectively. 1 stroke. It can be seen from these graphs that the smaller the dimension n is, the smaller the magnetic flux passing through the graphs is, the more the magnetic flux can be curved at a lower speed, and the braking force peaks at a relatively small speed when the dimension mfJt is large. This suggests that it is possible to reduce the braking force by rotating the disk 1 at a speed much lower than this peak.

Therefore, if the dimensions of the magnetic poles N and S are set to appropriate values of - and n, it is possible to bend the magnetic flux within a small braking force range.

The above operation is magnetic pole N. Between S, four high-speed rotating disks 1~
Even if the small hole H is configured by 4, as a result, as shown in FIG. The result is that

FIG. 13 is a graph showing the progress of strong magnetic field generation by this device, and FIG. b) shows the state of attenuation of the rotational speed of the disk due to the braking action of eddy currents.

vo, 1 in Fig. 13(b) directs the magnetic flux to the small hole H
This is the minimum speed required for convergence within the disk, and when the peripheral speed of the disk becomes lower than v, l, l, the magnetic flux travels straight through the disk, and the convergence power of the magnetic flux decreases rapidly. 13th
Figure (c) shows the density characteristics of the magnetic flux converged in the small hole H, and from this graph it can be seen that after the switch is turned on, the current increases and the iron core 7a saturates at time 1. Therefore, the rotational speed of the disk is ν
It can be seen that the strong magnetic field in the open small hole H is maintained at an approximately constant value until time t, when the value becomes lower than 7.

Note that the dimensions of each member for the experimental apparatus were set as shown in FIG. That is, the diameter of the disk is 700alI11
The thickness of the copper peripheral part of the disk is 20 mm = width 1
It is 50mm.

The cross sections of the magnetic poles N and S are 50×50 (a+m2), and the inner diameter of the spherical magnetic pole surface is 501 mIIl.

Furthermore, the minimum distance between the magnetic pole and the disc is 10 degrees.

In addition, the disc rotation speed is 380 Qrpm (the peripheral speed is 13
2+a/s), and the weight of the rotating part is approximately 450 kg.
It is.

Further, the strong magnetic field characteristics F obtained by the present invention are shown in FIG. 3 for comparison with the strong magnetic field characteristics A-E obtained by various conventional means.

Note that three or more pairs of rotating disks may be provided vertically. For example, when four pairs of rotating disks are provided, the first and third pairs of rotating disks are provided in the same phase, and #2 By providing the fourth pair of rotating disks in the same phase, the first and third pair of rotating disks can have a common disk rotation axis, and the second and fourth pair of rotating disks can have a common disk rotation axis. Can be shared.

Also, instead of using a highly conductive material on the periphery of the rotating disk,
A member having vehicle magnetic permeability may also be used.

Furthermore, if there is a risk that the disc will become hot due to the generation of eddy currents, appropriate cooling means will be used.

As detailed above, according to the high speed rotating disk type strong magnetic field generator of the present invention, the following effects and advantages can be obtained.

(1) Since it is only necessary to convert the kinetic energy possessed by the high-speed rotating disk into electromagnetic energy, there is no need for large-scale power supply equipment as in conventional methods.
In order to obtain a continuous strong magnetic field of about 0 to 30 T, a current of about several hundred amperes is sufficient.

(2) Since it is possible to maintain a constant strong magnetic field for a relatively long time (several seconds or more), it is possible to conduct not only physical research using instantaneous pulsed strong magnetic fields, but also engineering research, such as dissolution in a strong magnetic field. It will also be possible to study recrystallization of solids inside and friction phenomena between weakly magnetic metals.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams for explaining conventional strong magnetic field generating means, respectively. Figure 3 is a graph comparing the strong magnetic field characteristics generated by various methods. The figure shows a high-speed rotating disk-type strong magnetic field generator as an embodiment of the present invention, and FIG. 4 is a schematic diagram for explaining the arrangement of the first and second rotating disk pairs. Figure 5 is an explanatory diagram showing the overall schematic configuration with the second pair of rotating discs omitted, Figure 6 is an enlarged view of the magnetic pole portion with the second pair of rotating discs omitted, and Figure 7 is its An enlarged view showing a part of the magnetic pole part in more detail, Figure 8 is a schematic diagram to explain its action, Figures 9 and 10 are graphs to explain its action, and Figure #11 is an illustration of its principle. Schematic diagram for explanation, 12th
The figure is a schematic diagram showing the magnetic pole part enlarged to explain the effect, and FIGS. 13(a) to 13(c) are graphs for explaining the effect, respectively. 1 to 4... Rotating disk, la, 2a=3m, 4a... Periphery of rotating disk, 5... First rotating disk pair, 6... Second rotating disk pair, 7... Electromagnet, 7a...Iron core, 7b...Coil, 8...Sample insertion hole, 9...Driver, E...DC power supply, H...Small hole, N, S...Magnetic pole, Sl...1st slit, S2 ...Second slit, SW...switch. Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 3 Figure Time t (integral) → Figure 4 Figure 5 - Figure 6 Figure 7 Figure 9 Figure 10 Ream 1" V (mzs) - S Figure 11'ip, Figure 12

Claims (5)

[Claims] (1) A first rotating disk pair consisting of two metal rotating disks arranged with their peripheral edges close to each other so as to form a first slit on the same plane, and another rotating disk pair having a different level from the above plane. a second rotating disk pair consisting of two metal rotating disks disposed with their peripheral edges close to each other so as to form a second slit in a direction perpendicular to the first slit on the same level in a plane; Along with the # above! A magnet is provided so that a small hole formed in the axial direction of the rotating disk by the first and second slits is interposed between the magnetic poles, and the magnetic field by the magnet is focused in the small hole. A high-speed rotating disk type strong magnetic field generating device, characterized in that a drive device capable of driving each rotating disk in the first and second rotating disk pair to rotate at high speed is provided to generate a strong magnetic field. (2) The high-speed rotating disk type strong magnetic field generating device according to claim 1, wherein the peripheral edge of each rotating disk in the first and second rotating disk pair is made of a highly conductive material. (3) The high-speed rotating disk type strong magnetic field generating device according to claim 1, wherein the first and second rotating disk pairs are provided close to each other. (4) The high speed rotating disk type strong magnetic field generator according to claim 1, wherein the magnetic pole surface of the magnet has a curved concave surface. (5) A high-speed rotating disk-type strong magnetic field generator according to claim 1 or 4, wherein the magnet is configured as an electromagnet.