JP2021057537A - Magnetization device, magnetization method and magnet-driven pump - Google Patents

Abstract

To also improve a magnetization degree of a magnetized object while suppressing cost without performing a magnetizing operation a plurality of times when magnetizing a relatively small magnet material like a magnet coupling mechanism which drives a magnet-driven pump.SOLUTION: An outer magnet of a magnetization device comprises: an outer yoke in a hollow cylinder shape; an even number of magnet materials 4 each of which is a magnetized object and which are disposed on an inner surface and the same circumference of the outer yoke at equal intervals; a magnetizer which is disposed inside of the magnet materials, has a substantially equal outer peripheral length to a length of the inside of the magnet materials and includes magnetic field generation parts 8 each generating magnetic fields in which adjacent magnetic fields have reverse polarities, toward opposed magnet materials as many as the magnet materials; and a power unit which is connected to the magnetizer and generates a magnetic field required for magnetizing the magnet materials by causing a current to flow to the magnetic field generation parts just once. A center of one magnet material and a center of an opposed magnetic field generation part are displaced just equal to or smaller than an angle obtained by dividing 360 degrees with a double number as large as the number of magnet materials in a circumferential direction inside of the outer yoke.SELECTED DRAWING: Figure 4

Description

The present invention relates to a technique for magnetizing a magnet constituting a magnet coupling mechanism in a magnet-driven pump.

In recent years, the market needs for pumps having a magnetic coupling mechanism that drives a driving body such as a gear by magnetic action have been increasing. In the pump industry having such a magnet coupling mechanism, gear pumps have been adopted for various fluids due to the high performance of magnets used for magnet coupling. In particular, it is used as a high pressure generator in various rotation speed ranges in quantitative transfer, metering transfer, and hydraulic power transmission of high-viscosity fluids.

By the way, a method for efficiently magnetizing a magnet used in a drive mechanism of a rotating machine such as a motor or a generator has been actively researched and developed, and many patent applications have been filed for the results.

For example, Patent Document 1 proposes "a method of magnetizing a plurality of rare earth magnets fixed to a rotor with a high magnetic permeability", and Patent Document 2 "high performance with as few non-magnetized parts as possible". A magnetizing device that can prevent puncture of the yoke by obtaining a magnet by a simple method and adopting a thick wire exciting coil has been proposed.

Japanese Unexamined Patent Publication No. 2002-124414 JP-A-2002-204542

However, the above-mentioned conventional technique is a technique in a drive mechanism of a large-scale rotating machine, and has a problem that it is difficult to apply it to an operation of magnetizing a relatively small magnet material.
Further, all of the above-mentioned conventional techniques have a problem that the cost of magnetizing the magnet material as a whole is high based on the fact that the magnetizing operation is performed a plurality of times.

Therefore, in view of the above problems, in the present invention, when a relatively small magnet material such as a magnet coupling mechanism for driving a magnet drive pump is magnetized, the magnetizing operation is not performed a plurality of times to reduce the cost and to be magnetized. It is an object of the present invention to provide a magnetizing device that also enhances the degree of magnetizing an object.

One form of the magnetizing device disclosed is a hollow cylindrical outer yoke and a magnetized object of an anisotropic magnet, which are formed of a ferromagnetic material, and are on the inner surface of the outer yoke and on the same circumference. An even number of first magnet materials are arranged at equal intervals, and the first magnet material is arranged inside the first magnet material, has an outer peripheral length substantially the same as the inner length of the first magnet material, and is wound around the iron core and the iron core. It is a first magnetic field generating part that is composed of a coil to be generated and generates a magnetic field toward the first magnet material facing each other when a current flows through the coil, and adjacent ones generate a magnetic field of opposite poles. The first magnetic field generator is connected to the first magnetizer having the same number as the first magnet material and the first magnetizer, and the first magnet material is magnetized by passing a current through the coil only once. A magnetizing device having a magnetizing power supply device for generating a magnetic field required for the above, wherein the center of one of the first magnet materials and the center of the first magnetic field generating portion facing the first magnet material. However, in the circumferential direction inside the outer yoke, the deviation is equal to or less than an angle obtained by dividing 360 ° by a number twice the number of the first magnet materials.

Further, one form of the magnetizing device disclosed is a cylindrical inner yoke formed of a ferromagnetic material and a magnetized object of an anisotropic magnet, which is on the outer surface of the inner yoke and on the same circumference. The second magnet material is arranged evenly at equal intervals, and the inner circumference is arranged outside the second magnet material and has substantially the same inner circumference as the outer length of the second magnet material, and the iron core and the circumference of the iron core are provided. A second magnetic field generator that is composed of a coil wound around a magnet and generates a magnetic field toward the opposite second magnet material when a current flows through the coil, and adjacent ones generate a magnetic field of opposite poles. The second magnet material to be generated is connected to the second magnetizer having the same number of second magnetic field generators as the second magnet material, and the second magnet material is generated by passing a current through the coil only once. A magnetizing device having a magnetizing power supply device for generating a magnetic field required for magnetizing, wherein the second magnetic field generating unit faces the center of the second magnet material and the second magnet material. The center of the inner yoke is deviated by an angle equal to or less than 360 ° divided by twice the number of the second magnet materials in the circumferential direction of the inner yoke.

The magnetizing device disclosed discloses that when magnetizing a relatively small magnet material such as a magnet coupling mechanism for driving a magnet driving pump, the magnetizing operation is not performed a plurality of times to reduce the cost, and the magnetized object is magnetized. Also increase the degree.

It is a figure which shows the structural example of the outer magnet which concerns on this embodiment. It is a figure which shows the structural example of the 1st porcelain which concerns on this embodiment. It is a figure which shows the structural example of the inner magnet which concerns on this embodiment. It is a figure explaining the positional relationship between the 1st magnet material and the 1st magnetic field generation part which concerns on this Embodiment. It is a figure explaining the positional relationship between the 2nd magnet material and the 2nd magnetic field generation part which concerns on this Embodiment. It is a figure which shows the measurement result example of the magnetizing performance by the magnetizing apparatus which concerns on this embodiment. It is a figure which shows an example of the magnet drive pump which concerns on this embodiment.

A mode for carrying out the present invention will be described with reference to the drawings.
(Structure of magnetizing device according to this embodiment)

The structure of the magnetizing device 1 according to the present embodiment will be described with reference to FIGS. 1 to 7. FIG. 1 is a cross-sectional view showing an outer magnet 24 (including an outer yoke 2 and a first magnet material 4), and FIG. 2 is a view showing a first porcelain 6. FIG. 3 is a cross-sectional view showing an inner magnet 26 (including an inner yoke 16 and a second magnet material 18). 4 and 5 are diagrams showing the positional relationship between the magnet materials 4 and 18 and the magnetic field generating portions 8 and 22 during the magnetizing operation, and FIG. 6 is an example of the measurement result of the magnetizing performance by the magnetizing device 1. It is a figure which shows. FIG. 7 is a diagram showing a cross-sectional structure of the magnet-driven pump 30.

The magnetizing device 1 includes an outer yoke 2, a first magnet material 4, a first magnetizing device 6, a magnetizing power supply device 14, an inner yoke 16, a second magnet material 18, and a second magnetizing device 20. As shown in FIG. 1, the outer yoke 2 is a portion formed of a ferromagnetic material such as carbon steel and having a hollow cylindrical shape or a cup shape.

As shown in FIG. 1, the first magnet material 4 is a magnetized object to be magnetized by the magnetizing device 1, which is composed of an anisotropic magnet such as a neodymium magnet and a samarium-cobalt magnet. An even number of the first magnet materials 4 are arranged on the inner surface of the outer yoke 2 and on the same circumference at equal intervals. Each of the first magnet materials 4 has substantially the same shape, although there are slight differences. The first magnet material 4 may have a rectangular parallelepiped shape, or may have a concentric circular shape along the inner surface of the outer yoke 2. In that case, the first magnet material 4 having substantially the same shape may have a shape. , It is preferable that they are arranged so as to be connected.

As shown in FIG. 2, the first porcelain 6 includes the same number of first magnetic field generation units 8 as the first magnet material 4. The first magnetic field generating unit 8 is composed of an iron core 10 and a coil 12 wound around the iron core 10, and is a portion that generates a magnetic field toward the opposite first magnet material 4 when a current flows through the coil 12. The first magnetic field generating portion 8 is arranged inside the first magnet material 4, and has an outer peripheral length substantially the same as the inner length of the first magnet material 4. In addition, the adjacent first magnetic field generating units 8 generate magnetic fields of opposite poles, respectively.
As shown in FIG. 3, the inner yoke 16 is a portion formed of a ferromagnetic material such as carbon steel and having a cylindrical shape (cylindrical shape). However, the inner yoke 16 may have a polygonal shape according to the shape of the magnet.

As shown in FIG. 3, the second magnet material 18 is an object to be magnetized by the magnetizing device 1 composed of an anisotropic magnet such as a neodymium magnet and a samarium-cobalt magnet. An even number of second magnet materials 18 are arranged on the outer surface of the inner yoke 16 and on the same circumference at equal intervals. Each of the second magnet materials 18 has substantially the same shape, although there are slight differences. The second magnet material 18 may have a rectangular parallelepiped shape, or may have a concentric circular shape along the outer surface of the inner yoke 16. In that case, the second magnet material 18 having substantially the same shape may have a shape. , It is preferable that they are arranged so as to be connected.

The second porcelain 20 includes the same number of second magnetic field generators 22 as the second magnet material 18. The second magnetic field generating unit 22 is composed of an iron core 10 and a coil 12 wound around the iron core 10, and when a current flows through the coil 12, a magnetic field is generated toward the second magnet material 18 which is an object to be magnetized. It is the part to generate. The second magnetic field generating unit 22 is arranged outside the second magnet material 18 and has an inner peripheral length substantially the same as the outer length of the second magnet material 18. Further, the adjacent second magnetic field generating units 22 generate magnetic fields of opposite poles, respectively.

The magnetizing power supply device 14 is connected to the first magnetizing device 6 and causes a large magnetic field required for magnetizing the first magnet material 4 by passing a large current through the coil 12 only once. Further, the magnetizing power supply device 14 is connected to the second magnetizing device 20 and causes a large magnetic field required for magnetizing the second magnet material 18 by passing a large current through the coil 12 only once.

The magnetizing power supply device 14 controls an AC power supply with a charging circuit, boosts it with a transformer, converts it to direct current with a rectifier circuit, and stores an electric charge in a capacitor bank. Then, the magnetizing power supply device 14 turns on the discharge circuit for the stored energy, momentarily causes a large current to flow through the coil 12, and generates a high magnetic field required for magnetizing.

As shown in FIG. 4, in the magnetizing device 1, the center of the first magnet material 4 and the center of the first magnetic field generating portion 8 facing the first magnet material 4 are 360 in the circumferential direction inside the outer yoke 2. The deviation is equal to or less than the angle obtained by dividing ° by twice the number of the first magnet materials 4. That is, in the magnetizing device 1, in the circumferential direction inside the outer yoke 2, the end portion of the first magnetic field generating portion 8 and the end portion of each first magnet material 4 do not match and are displaced, and both ends thereof. The deviation angle in the circumferential direction is 360 ° ÷ "number of first magnet materials 4" ÷ 2 or less.

As shown in FIG. 5, in the magnetizing device 1, the center of the second magnet material 18 and the center of the second magnetic field generating portion 22 facing the second magnet material 18 are 360 ° in the circumferential direction of the inner yoke 16. Is deviated by an angle or less divided by twice the number of the second magnet materials 18. That is, in the magnetizing device 1, in the circumferential direction of the inner yoke 16, the end portion of the second magnetic field generating portion 22 and the end portion of each second magnet material 18 do not match and are displaced, and the radii of both end portions are offset. The deviation angle in the direction is 360 ° ÷ "number of second magnet materials 18" ÷ 2 or less.

As described above, since the centers of the magnet materials 4 and 18 and the centers of the magnetic field generating portions 8 and 22 are deviated in the circumferential direction, the magnetizing device 1 does not perform the magnetizing operation a plurality of times, and the cost is suppressed. The reason why the degree of magnetization of the magnetized objects 4 and 18 can be increased will be described.

When the end of the magnetic field generating part and the end of each magnet material are aligned in the circumferential direction and the magnetizing operation is performed by the magnetizing power supply device as in the conventional magnetizing device, the space between adjacent magnet materials ( The gap) is the unmagnetized region. When this unmagnetized region exists, a demagnetic field region is formed between adjacent magnet materials, and a reverse pole is likely to appear there, resulting in a loss.

On the other hand, when the ends of the magnetic field generating portions 8 and 22 and the ends of the individual magnet materials 4 and 18 are not aligned with each other and are arranged in a staggered manner as in the magnetizing device 1, one magnet is used. An N-pole region and an S-pole region appear in the materials 4 and 18. In this case, the joints of the adjacent magnet materials 4 and 18 have the same pole, and the repulsive magnetic field generated at the joints generates a stronger magnetic field from the state where the magnetic field is difficult to leak out of the demagnetizing field region in the conventional method. It is something that makes you.

FIG. 6 shows how the degree of magnetization of the magnet materials 4 and 18 by the magnetizing device 1 changes when the angle of the deviation is changed as compared with the full magnetization (100% reference line in the figure). It shows the result of measuring whether or not to do. In FIG. 6, the number of the first magnet materials 4 is eight.

In the measurement results shown in FIG. 6, as the deviation angle increases, the degree of magnetism improves, and the deviation angle is 22.5 ° (= 360 ° ÷ “number of first magnet materials 4 = 8””. When ÷ 2), the degree of magnetism peaks, which exceeds the state of full magnetism. Full magnetization is performed by applying a sufficiently strong magnetic field to the magnet itself in the air-core coil, and it is considered that the magnet at this time has almost reached saturation magnetization.

As shown in FIG. 7, the first magnet material 4 and the outer yoke 2 magnetized by the magnetizer 1, and the second magnet material 18 and the inner yoke 16 are used as a driving body of the pump 30. The combination of the outer yoke 2 and the first magnet material 4 is called an outer magnet 24, and the combination of the inner yoke 16 and the second magnet material 18 is called an inner magnet 26.

As shown in FIG. 7, the pump 30 has a configuration in which a driving body is driven by a magnet coupling mechanism 28 formed by magnetic coupling between the outer magnet 24 and the inner magnet 26.

Based on the above configuration, the magnetizing device 1 does not perform the magnetizing operation a plurality of times when magnetizing the relatively small magnet materials 4 and 18 such as the magnet coupling mechanism 28 for driving the magnet driving pump 30. The cost is suppressed, and the degree of magnetization of the magnetized objects 4 and 18 is also increased.
(How to use the magnetizing device according to this embodiment)

The magnetizing method by the magnetizing device 1 will be described with reference to FIGS. 4, 5 and 6. As shown in FIG. 4, in the magnetizing device 1, the center of the first magnet material 4 and the center of the first magnetic field generating portion 8 facing the first magnet material 4 are 360 in the circumferential direction inside the outer yoke 2. The outer yoke 2 and the first magnet material 4 are installed in the first magnetizer 6 with a shift of ° by an angle equal to or less than the number obtained by dividing ° by twice the number of the first magnet materials 4. That is, in the magnetizing device 1, in the circumferential direction inside the outer yoke 2, the end portion of the first magnetic field generating portion 8 and the end portion of each first magnet material 4 do not match and are displaced, and both ends thereof. The deviation angle in the circumferential direction is 360 ° ÷ "number of first magnet materials 4" ÷ 2 or less.

In the magnetized power supply device 14, the AC power supply is controlled by a charging circuit, boosted by a transformer, then converted to direct current by a rectifier circuit, and the electric charge is stored in the capacitor bank. Then, in the magnetizing power supply device 14, the discharge circuit is turned on for the stored energy, the coil 12 is momentarily energized, a large current is passed through the coil 12, and a high magnetic field required for magnetizing is generated. This magnetizing operation is performed only once for each set of outer magnets 24 formed of the outer yoke 2 and the plurality of first magnet materials 4.

Further, as shown in FIG. 5, in the magnetizing device 1, the center of the second magnet material 18 and the center of the second magnetic field generating portion 22 facing the second magnet material 18 are located in the circumferential direction of the inner yoke 16. The inner yoke 16 and the second magnet material 18 are installed in the second magnetizer 20 by shifting 360 ° by an angle equal to or less than the number obtained by dividing 360 ° by twice the number of the second magnet materials 18. That is, in the magnetizing device 1, In the circumferential direction of the inner yoke 16, the end of the second magnetic field generating portion 20 and the end of each second magnet material 18 do not match and are misaligned, and the radial misalignment angle of both ends is 360 °. ÷ "Number of second magnet materials 18" ÷ 2 or less.

In the magnetized power supply device 14, the AC power supply is controlled by a charging circuit, boosted by a transformer, then converted to direct current by a rectifier circuit, and the electric charge is stored in the capacitor bank. Then, in the magnetizing power supply device 14, the discharge circuit is turned on for the stored energy, the coil 12 is momentarily energized, a large current is passed through the coil 12, and a high magnetic field required for magnetizing is generated. This magnetizing operation is performed only once for each set of inner magnets 26 formed of the inner yoke 16 and the plurality of second magnet materials 18.

As shown in FIG. 6, the magnet material 4 is at least compared to the case where the magnet materials 4 and 18 and the magnetic field generating parts 8 and 22 are installed without any deviation by the magnetizing method by the magnetizing device 1 as described above. , 18 can be improved in degree of magnetization. Further, in the magnetizing method by the magnetizing device 1 as described above, when the magnitude of the deviation between the magnet materials 4 and 18 and the magnetic field generating portions 8 and 22 is within a specific range, the magnet materials 4 and 18 are magnetized. The degree of can be increased more than in the fully magnetized state.

Therefore, the magnetizing method using the magnetizing device 1 costs less when magnetizing relatively small magnet materials 4 and 18 such as the magnet coupling mechanism 28 that drives the magnet driving pump 30 without performing the magnetizing operation a plurality of times. It is possible to increase the degree of magnetization of the magnetized objects 4 and 18 by suppressing the above.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications are made within the scope of the gist of the present invention described in the claims.・ Can be changed.

1 Magnetizing device 2 Outer yoke 4 1st magnet material 6 1st magnetizing machine 8 1st magnetic field generating part 10 Iron core 12 Coil 14 Magnetizing power supply device 16 Inner yoke 18 2nd magnet material 20 2nd magnetizing machine 22 2nd magnetic field generation Part 24 Outer magnet 26 Inner magnet 28 Magnet coupling mechanism 30 Magnet-driven pump

One form of the magnetizing device disclosed is a hollow cylindrical outer yoke and a magnetized object of an anisotropic magnet, which are formed of a ferromagnetic material, and are on the inner surface of the outer yoke and on the same circumference. An even number of first magnet materials are arranged at equal intervals, and the first magnet material is arranged inside the first magnet material, has an outer peripheral length substantially the same as the inner length of the first magnet material, and is wound around the iron core and the iron core. It is a first magnetic field generating part that is composed of a coil to be generated and generates a magnetic field toward the first magnet material facing each other when a current flows through the coil, and adjacent ones generate a magnetic field of opposite poles. The first magnetic field generator is connected to the first magnetizer having the same number as the first magnet material and the first magnetizer, and the first magnet material is magnetized by passing a current through the coil only once. A magnetizing device having a magnetizing power supply device for generating a magnetic field required for the above, wherein the center of one of the first magnet materials and the center of the first magnetic field generating portion facing the first magnet material. Is deviated by an angle equal to or less than 360 ° divided by twice the number of the first magnet materials in the circumferential direction inside the outer yoke, and is composed of the first magnet material and the outer yoke. The outer magnet is characterized in that it forms a magnet coupling mechanism that drives a driving body of a pump by magnetic coupling with an inner magnet.

Claims (15)

A hollow cylindrical outer yoke made of ferromagnet,
The first magnet material, which is a magnetized material of an anisotropic magnet and is arranged on the inner surface of the outer yoke and on the same circumference at equal intervals, and the first magnet material.
It is arranged inside the first magnet material, has an outer peripheral length substantially the same as the inner length of the first magnet material, and is composed of an iron core and a coil wound around the iron core, and a current flows through the coil. The first magnetic field generating portion that generates a magnetic field toward the first magnet material facing each other, and the adjacent ones generate a magnetic field having opposite poles, is referred to as the first magnet material. The first magnetizer with the same number and
A magnetizing device that is connected to the first magnetizing device and has a magnetizing power supply device that generates a magnetic field required for magnetizing the first magnet material by passing an electric current through the coil only once.
The number of the first magnet materials is 360 ° in the circumferential direction inside the outer yoke, with the center of the first magnet material and the center of the first magnetic field generating portion facing the first magnet material. A magnetizing device characterized in that the deviation is equal to or less than the angle divided by twice the number of. The magnetizing device according to claim 1, wherein the first magnet materials have the same shape. The first magnet material forms a concentric circle along the inner surface of the outer yoke.
The magnetizing device according to claim 1 or 2, wherein the first magnet materials having substantially the same shape are arranged so as to be connected to each other. A cylindrical inner yoke made of ferromagnet,
A second magnet material, which is a magnetized material of an anisotropic magnet and is arranged on the outer surface of the inner yoke and on the same circumference at equal intervals, and a second magnet material.
It is arranged outside the second magnet material, has an inner peripheral length substantially the same as the outer length of the second magnet material, and is composed of an iron core and a coil wound around the iron core, and a current flows through the coil. The second magnet material is a second magnetic field generating portion that generates a magnetic field toward the second magnet material that opposes each other, and the second magnetic field generating portion that generates a magnetic field of opposite poles between adjacent ones. The second magnetizer with the same number as
A magnetizing device that is connected to the second magnetizing device and has a magnetizing power supply device that generates a magnetic field required for magnetizing the second magnet material by passing an electric current through the coil only once.
The center of the second magnet material and the center of the second magnetic field generating portion facing the first second magnet material are 360 ° in the circumferential direction of the inner yoke, and the number of the second magnet materials is 360 °. A magnetizing device characterized in that it is deviated by an angle or less divided by a double number. The magnetizing device according to claim 4, wherein the second magnet materials have the same shape. The second magnet material forms a concentric circle along the outer surface of the inner yoke.
The magnetizing device according to claim 4 or 5, wherein the second magnet materials having substantially the same shape are arranged so as to be connected to each other. A hollow cylindrical outer yoke made of ferromagnet,
The first magnet material, which is a magnetized material of an anisotropic magnet and is arranged on the inner surface of the outer yoke and on the same circumference at equal intervals, and the first magnet material.
It is arranged inside the first magnet material, has an outer peripheral length substantially the same as the inner length of the first magnet material, and is composed of an iron core and a coil wound around the iron core, and a current flows through the coil. The first magnetic field generating portion that generates a magnetic field toward the first magnet material facing each other, and the adjacent ones generate a magnetic field having opposite poles, is referred to as the first magnet material. The first magnetizer with the same number and
A magnetizing method using a magnetizing device which is connected to the first magnetizing device and generates a magnetic field required for magnetizing the first magnet material by passing an electric current through the coil. There,
The number of the first magnet materials is 360 ° in the circumferential direction inside the outer yoke with the center of the first magnet material and the center of the first magnetic field generating portion facing the first magnet material. Shift it so that it is less than or equal to the angle divided by twice the number of
The first magnet is generated by passing a current that generates a magnetic field required for magnetizing the first magnet material from the magnetizing power supply device to the coil only once so that adjacent objects have opposite poles. A magnetizing method characterized by magnetizing a material. The magnetizing method according to claim 7, wherein the first magnet materials have the same shape. The first magnet material forms a concentric circle along the inner surface of the outer yoke.
The magnetizing method according to claim 7, wherein the first magnet materials having substantially the same shape are arranged so as to be connected to each other. A cylindrical inner yoke made of ferromagnet,
A second magnet material, which is a magnetized material of an anisotropic magnet and is arranged on the outer surface of the inner yoke and on the same circumference at equal intervals, and a second magnet material.
It is arranged outside the second magnet material, has an inner peripheral length substantially the same as the outer length of the second magnet material, and is composed of an iron core and a coil wound around the iron core, and a current flows through the coil. The second magnet material is a second magnetic field generating portion that generates a magnetic field toward the second magnet material that opposes each other, and the second magnetic field generating portion that generates a magnetic field of opposite poles between adjacent ones. The second magnetizer with the same number as
A magnetizing method using a magnetizing device which is connected to the second magnetizer and generates a magnetic field required for magnetizing the second magnet material by passing an electric current through the coil. There,
The center of the second magnet material and the center of the second magnetic field generating portion facing the first second magnet material are 360 ° in the circumferential direction of the inner yoke, and the number of the second magnet materials is 360 °. Shift it so that it is less than or equal to the angle divided by twice.
The second magnet is generated by passing a current that generates a magnetic field required for magnetizing the second magnet material from the magnetizing power supply device to the coil only once so that adjacent objects have opposite poles. A magnetizing method characterized by magnetizing a material. The magnetizing method according to claim 10, wherein the second magnet materials have the same shape. The second magnet material forms a concentric circle along the outer surface of the inner yoke.
The magnetizing method according to claim 10 or 11, wherein the second magnet materials having substantially the same shape are arranged so as to be connected to each other. The driving body of the pump is driven by the magnetic coupling between the outer magnet and the inner magnet composed of the first magnet material to be magnetized by the magnetizing method according to any one of claims 7 to 9 and the outer yoke. A magnet-driven pump with a magnet-coupling mechanism. The drive body of the pump is driven by magnetic coupling between the outer magnet and the second magnet material to be magnetized by the magnetizing method according to any one of claims 10 to 12 and the inner magnet composed of the inner yoke. A magnet-driven pump with a magnet-coupling mechanism. The outer magnet composed of the first magnet material and the outer yoke to be magnetized by the magnetizing method according to any one of claims 7 to 9, and the said item according to any one of claims 10 to 12. A magnet-driven pump having a magnet coupling mechanism that drives a driving body of the pump by magnetic coupling between the second magnet material to be magnetized by a magnetizing method and an inner magnet composed of the inner yoke.

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