JP3940980B2 - Permanent magnet magnetizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a permanent magnet magnetizing apparatus, and more particularly to a permanent magnet magnetizing apparatus using a superconducting magnet.
[0002]
[Prior art]
Conventionally, permanent magnets such as rare earth magnets have to be magnetized by applying a strong magnetic field of 1 to 3 T (Tesla) to the object to be magnetized in the final process of production.
Conventionally, a pulse electromagnet has been used for this magnetization operation. That is, magnetization is performed by applying a magnetic field with a current of several hundred amperes by this pulse electromagnet for about 0.1 second, for example, which is a practical means in terms of energy. It should be noted that it is practically difficult to put the magnetic object in and out of the magnetic field within this short time while the magnetic field is constantly generated by the electromagnet, and the pulsed magnet can be used to supply the magnetic field in pulses. It has been broken.
However, with the development of rare earth magnet materials in recent years, the magnetic field strength necessary for the magnetization has been improved. On the other hand, it is difficult to obtain the necessary strong magnetic field with the pulse electromagnet, and the economic efficiency for magnetization is low. There is a problem of lowering.
In addition, in the magnetizing operation using the pulse electromagnet, there is a problem that the permanent magnet cannot be magnetized due to the eddy current flowing in the case when the permanent magnet is put in another metal case.
[0003]
On the other hand, focusing on a superconducting magnet that can obtain a stronger magnetic field than a pulsed electromagnet, a method of magnetizing a permanent magnet by a magnetic field generated by the superconducting magnet has also been attempted. However, the superconducting magnet requires several minutes to several tens of minutes for raising and lowering its magnetic field, and there is a problem that the magnetic field cannot be supplied in the form of pulses like a pulsed electromagnet.
[0004]
[Problems to be solved by the invention]
The present invention has been considered in view of the above problems, and an object of the present invention is to provide a permanent magnet magnetizing apparatus capable of performing practical magnetization using a superconducting magnet.
[0005]
Another object of the present invention is to provide a permanent magnet magnetizing apparatus capable of magnetizing an object to be magnetized with a strong magnetic field generated.
[0006]
It is another object of the present invention to provide a permanent magnet magnetizing apparatus that can greatly improve the magnetizing performance and efficiency.
[0007]
It is another object of the present invention to provide a permanent magnet magnetizing apparatus capable of continuously transferring a magnetized object to a superconducting magnet and reducing the driving force thereof.
[0008]
[Means for Solving the Problems]
That is, the present invention focuses on using a superconducting magnet as the magnetizing means, leaving the magnetic field generated by the superconducting magnet to be generated, and providing a magnetized material transport mechanism for supplying the magnetized material. A permanent magnet magnetizing apparatus for placing a magnetized object in a magnetic field of an electromagnet and magnetizing it to make a permanent magnet, wherein a superconducting magnet is employed as the electromagnet, and the superconducting magnet A permanent magnet magnetizing apparatus comprising a magnetized object transporting mechanism for supplying the magnetized object so as to be taken in and out intermittently in a magnetic field generating room temperature space formed in the above.
[0009]
The adherend magnet transport mechanism includes a transfer means for transferring the adherend in the direction of the superconducting magnet, and the adherend in the magnetic field generating room temperature when the transfer means is temporarily stopped. And a reciprocating insertion means such as a reciprocating cylinder for reciprocating.
[0010]
The adherend magnet transport mechanism moves the adherend in the direction of the superconducting magnet, and moves the adherend from the upstream side to the downstream side in the magnetic field generation room temperature space. It can have conveying means, such as a bell to convey and a conveyor.
[0011]
The magnetized object transport mechanism includes a magnetized object accommodating member that accommodates the magnetized object, a first magnetized object accommodating member of the preceding magnetized object, and the magnetized magnet that continues. A tension member provided between the object and the second magnetized object housing member, an extruding means for continuously and sequentially extruding the strut member and the adherend magnet object accommodating member in the direction of the superconducting magnet, and the pushing means And a conveying path means for passing the stretched member and the adherend magnet housing member pushed out from the upstream side to the downstream side in the magnetic field generation room temperature space.
[0012]
In the permanent magnet magnetizing apparatus according to the present invention, a superconducting magnet is used as the magnetizing means, and a strong magnetic field is kept generated, and the magnetized material is supplied into the constant strong magnetic field. Since the adherend magnet transport mechanism is provided, the adherend can be intermittently supplied into the strong magnetic field without supplying a pulsed magnetic field unlike a pulse electromagnet.
Therefore, the magnetizing operation can be completed by simply putting the magnetized object in and out of the magnetic field space (magnetic field generating room temperature space) while the strong magnetic field generated by the superconducting magnet is continuously generated. The production efficiency improves with the performance of the magnet.
[0013]
In particular, a tension member is provided between the first magnetized object housing member of the preceding magnetized object and the second magnetized object accommodating member of the continued magnetized object, and this thrust member is provided by the pushing means. And the magnetized object housing member are sequentially and sequentially pushed in the direction of the superconducting magnet to cancel the magnetic force between the preceding magnetized object and the continued magnetized substance, The supply pushing force of the adherend can be reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, a permanent magnet magnetizing apparatus 1 according to a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a schematic side view of a permanent magnet magnetizing apparatus 1. The permanent magnet magnetizing apparatus 1 includes a superconducting magnet 2 placed vertically, a load support 4 that supports the superconducting coil 3, and an adherend. And a magnetic material transport mechanism 5.
[0015]
The superconducting magnet 2 has a magnetic field generating room temperature space 6 at the center of the superconducting coil 3, and the magnetic field generating room temperature space 6 is not large enough to have a magnetized object 7 inserted therein and has a capacity. Yes.
[0016]
The load support 4 supports the superconducting coil 3 of the superconducting magnet 2 and needs to have a proof strength greater than the magnetic force acting between the superconducting magnet 2 and the adherend 7.
[0017]
The adherend magnetic body transport mechanism 5 includes a reciprocating transport means 8 (transfer means) and a reciprocating cylinder 9 (reciprocating insertion means) attached to the reciprocating transport means 8 and supporting the magnetized object 7. That is, the adherend 7 is attached to the tip of the arm portion 10 of the reciprocating cylinder 9.
[0018]
In the permanent magnet magnetizing apparatus 1 having such a configuration, the superconducting magnet 2 is excited to reciprocate by the reciprocating conveying means 8 of the adherend magnetic material conveying mechanism 5 while a strong magnetic field is generated in the magnetic field generating room temperature space 6. The cylinder 9 is transferred to the lower part of the magnetic field generation room temperature space 6 of the superconducting magnet 2, and then the arm portion 10 is extended to insert the adherend magnetic substance 7 into the magnetic field generation room temperature space 6.
Therefore, the reciprocating cylinder 9 opposes the attractive force of the superconducting coil 3 when the magnetized object 7 is inserted into the magnetic field generating room temperature space 6, and is attracted by the superconducting coil 3 when extracted from the magnetic field generating room temperature space 6. It is necessary to have enough force to hold it out of force.
[0019]
When the magnetized object 7 is inserted into the magnetic field generating room temperature space 6, the magnetized object 7 is magnetized to become a permanent magnet and is moved back to the original position by the magnetized material transport mechanism 5. Here, a new magnetized object 7 is mounted on the arm 10 and the same operation as described above is repeated.
[0020]
Thus, once a strong magnetic field is generated by the superconducting magnet 2, the magnetized object 7 can be taken in and out of the magnetic field generating room temperature space 6 as it is, so that the efficiency of the magnetizing work can be improved. In particular, the performance of a permanent magnet made of a rare earth magnet material can be improved.
[0021]
FIG. 2 is a schematic side view of a permanent magnet magnetizing apparatus 20 according to a second embodiment of the present invention. The permanent magnet magnetizing apparatus 20 includes a superconducting magnet 2 placed horizontally and an endless conveying means. 21 (adhered magnet conveyance mechanism).
[0022]
The conveying means 21 circulates and transfers the magnetized object 7 in the direction of the superconducting magnet 2, and includes a belt conveyor 22, a drive motor 23, and an object to be magnetized accommodating member 24.
[0023]
The belt conveyor 22 forms a rectangular conveyance path, and circulates the magnetic object accommodating member 24 through the magnetic field generating room temperature space 6 of the superconducting coil 3.
[0024]
The magnetized object accommodating member 24 is fixed to the belt conveyor 22 by a single or a predetermined equal interval, and a plurality of the magnetized object accommodating members 24 are accommodated therein. This is passed along with the adherend 7.
[0025]
In the permanent magnet magnetizing apparatus 20 having such a configuration, the object to be magnetized 7 is inserted from one port of the magnetic field generating room temperature space 6 by driving the belt conveyor 22 and is pulled out from the other port while being exposed to the strong magnetic field. To.
Therefore, the conveying means 21 opposes the attractive force by the superconducting coil 3 when the magnetized object 7 enters the magnetic field generating room temperature space 6, and the attractive force by the superconducting coil 3 when discharged from the magnetic field generating room temperature space 6. It is necessary to have enough force to hold it out of it.
[0026]
Thus, once the strong magnetic field generated by the superconducting magnet 2 is generated, it is only necessary to pass the adherend 7 in the magnetic field generating room temperature space 6 in one direction from the upstream side to the downstream side. The efficiency of the magnetic work can be improved, and the work of attaching and removing the adherend 7 to the adherend containing member 24 is easy.
[0027]
FIG. 3 is a schematic side view of a permanent magnet magnetizing apparatus 30 according to a third embodiment of the present invention. The permanent magnet magnetizing apparatus 30 includes a superconducting magnet 2 placed horizontally, and an object to be magnetized. And a mechanism 31.
[0028]
The adherend magnetic material transport mechanism 31 includes a magnetized material accommodating member 32, a tension member 33, an extruding means 34, and a linear transport path 35 (transport path means).
[0029]
The adherend magnet accommodating member 32 accommodates the adherend magnet 7 and moves it along the straight conveying path 35 in the direction of the superconducting magnet 2 by the pushing means 34 together with the tension member 33.
[0030]
The strut member 33 has a central rod portion 36 and a pair of left and right flange portions 37, and the first adherend object housing member 32 of the preceding adherend object 7 and the continued adherend object. This is provided between the second magnetized object housing member 32 and the second magnetized object housing member 32.
Therefore, the tension member 33 maintains a predetermined distance between the pair of preceding and continuing magnetized objects 7 and mechanically connects the magnetized object 7 with the magnetic field center of the superconducting magnet 2. It should be strong enough to withstand the compressive force caused by the magnetic force that is being pulled into.
[0031]
The push-out means 34 is constituted by, for example, a cylinder, and the arm portion 38 pushes out the tension member 33 and the adherend magnetic material accommodating member 32 continuously and sequentially in the direction of the superconducting magnet 2.
[0032]
In the permanent magnet magnetizing apparatus 30 having such a configuration, the preceding magnetized object 7 and the continuing magnetized object 7 are continuously linearly conveyed while being constrained by a tension member 33 between them. The superconducting magnet 2 is sequentially supplied on the path 35. That is, the adherend 7 is inserted from the upstream port of the magnetic field generating room temperature space 6 and pushed out from the downstream port.
Thus, in this permanent magnet magnetizing apparatus 30, the magnetic force acting on the preceding magnetized object 7 and the magnetic force acting on the continuing magnetized object 7 cancel each other out. The driving force of 34 can be greatly reduced. That is, as shown by the arrow, the magnetic force acting on the magnetic object 7 in the superconducting coil 3 in FIG. 3 and the magnetic object 7 to enter the magnetic field generating room temperature space 6 of the superconducting coil 3 and the magnetic field Magnetic forces in opposite directions act between the magnetized object 7 and the magnetized object 7 trying to escape from the generated room temperature space 6, and the magnetic force acting on the magnetized object 7 itself is canceled out.
Therefore, the pushing means 34 does not require such a strong driving force, the permanent magnet magnetizing apparatus 30 as a whole can be reduced in size, equipment investment can be reduced, and running costs can be reduced.
[0033]
The magnetic force canceling action will be described with reference to FIG.
FIG. 4 is a graph showing the relationship between the distribution of the magnetic field intensity in the superconducting coil 3 of the superconducting magnet 2 and the magnetic force acting on the adherend 7, and the horizontal axis is on the central axis of the superconducting coil 3. The position (Z) is indicated. In the graph, the black circle data is the magnetic field strength (magnetic flux density) shown on the left vertical axis, and is 5T at the central portion (Z = 0) of the superconducting coil 3. White circle data indicates the magnitude (kgf) of the magnetic force shown on the right vertical axis. In addition, the specific numerical value was calculated on the assumption that the adherend 7 was a disk having a diameter of 100 mm to 10 mm and that a ferromagnetic material was contained in 50% of the volume of the disk.
The magnetic force acting on the magnetic body (the magnetized object 7) is determined by the product of the gradient of the magnetic field at that location and the magnetization of the magnetic body. For example, at the magnetic field center (Z = 0) in the superconducting coil 3, the gradient of the magnetic field is zero, the magnetic force is zero, and it does not act on the adherend 7.
[0034]
Here, when the object to be magnetized 7 is brought close to the superconducting magnet 2 from the negative side of Z and is put into the magnetic field space, as shown in the graph, a positive magnetic force acts, and its magnitude is The maximum value is about 280 kgf near Z = -1.2 m. That is, the magnetized object 7 is intended to be drawn into the superconducting coil 3 with a strong force, and it is necessary to support and insert the magnetized object 7 with a force that opposes this pulling force.
On the other hand, when the magnetized object 7 that has reached the center of the magnetic field is pulled out in the positive direction of Z, as shown in the graph, a magnetic force in the negative direction acts, and the maximum value is about 280 kgf as in the insertion. Therefore, it is necessary to pull out or push it out with a force to counter this.
Thus, since two continuous magnetized objects 7 are pushed in a state where they are mechanically connected via the tension member 33, it becomes possible to cancel the magnetic force described above, and the pushing means 34 is linear. It is only necessary to exert a force for conveying only the weight of the adherend 7, the adherend containing member 32, and the tension member 33 on the cylindrical transfer path 35.
[0035]
As shown by the phantom line in FIG. 3, the magnetized object 7, the magnetized object housing member 32, and the tension member 33 that have been subjected to the magnetizing process are removed and the arm portion 38 of the pushing means 34 is retracted. In addition, a new magnetized object 7, a magnetized object accommodating member 32, and a tension member 33 are set on the linear conveyance path 35. As described above, the magnetic force of the set of the magnetized object 7, the object to be magnetized object accommodating member 32, and the tension member 33 already existing on the linear conveyance path 35 at the time of the retracting operation of the arm part 38 is offset. Therefore, it remains at its current position, and there is no hindrance to the work of adding a new set.
[0036]
【The invention's effect】
As described above, according to the present invention, the magnetizing operation is completed simply by taking the magnetic object into and out of the magnetic field space while the magnetic field of the superconducting magnet is continuously generated. The production efficiency of permanent magnets is improved.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a permanent magnet magnetizing apparatus 1 according to a first embodiment of the present invention.
FIG. 2 is a schematic side view of a permanent magnet magnetizing apparatus 20 according to a second embodiment of the present invention.
FIG. 3 is a schematic side view of a permanent magnet magnetizing apparatus 30 according to a third embodiment of the present invention.
4 is a graph showing the relationship between the distribution of the magnetic field strength in the superconducting coil 3 of the superconducting magnet 2 and the magnetic force acting on the adherend 7; FIG.
[Explanation of symbols]
1 Permanent magnet magnetizing apparatus (first embodiment, FIG. 1)
2 Superconducting magnet 3 Superconducting coil 4 of superconducting magnet 2 Load support 5 Adhered magnetic material transport mechanism 6 Magnetic field generation room temperature of superconducting coil 7 Adhered material 8 Reciprocating conveying means 9 Reciprocating cylinder 10 Arm of reciprocating cylinder 9 20 Permanent magnet magnetizing apparatus (second embodiment, FIG. 2)
21 Endless conveying means (adhered magnet conveying mechanism)
22 Belt conveyor 23 Drive motor 24 Magnetized object accommodation member 30 Permanent magnet magnetizing apparatus (third embodiment, FIG. 3)
31 Adhered Magnet Conveying Mechanism 32 Adhered Magnet Accommodating Member 33 Stretching Member 34 Extruding Unit 35 Linear Conveying Path
36 Central rod portion 37 of the tension member 33 A pair of left and right flange portions 38 of the tension member 33 Arm portion of the pushing means 34

Claims (1)

A permanent magnet magnetizing device for placing a magnetic object in a magnetic field of an electromagnet and magnetizing the magnetized material into a permanent magnet,
While adopting a superconducting magnet as the electromagnet,
A magnetic object transport mechanism for supplying the magnetic material to be intermittently taken in and out of the magnetic field generation room temperature space formed in the superconducting magnet ;
This adherend magnetic material transport mechanism
A magnetized object housing member that accommodates the magnetized material;
A tension member provided between the first magnetic object housing member of the preceding magnetic object to be preceded and the second magnetic object housing member of the magnetic object to be continued,
An extruding means that has a cylinder and its arm part, and this arm part sequentially and sequentially pushes out the tension member and the adherend magnetic material accommodating member in the direction of the superconducting magnet;
Transport path means for passing the stretched member and the adherend magnetic material accommodating member pushed out by the pushing means from the upstream side to the downstream side in the magnetic field generation room temperature space, and
A permanent magnet magnetizing apparatus characterized in that the pushing means can set a new magnetized object, a magnetized object accommodating member and a tension member on the conveying path means in a state where the arm portion is retracted. .

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