Devices that generate magnetism and methods for generating magnetism.

Abstract

DEPCT64 [Problem] In order to reduce costs without performing multiple magnetization processes and increase... The degree of magnetization of an object when a magnetic material of a certain size is applied. Relatively small magnets can occur, such as in magnetic coupling mechanisms that drive magnetically driven pumps. [Methods used to correct] Magnetizing devices include: an external yoke with a cylindrical shape. Hollow; an even number of magnetic materials which are magnetized objects and are arranged at equal intervals on a surface. Equal inner surface and circumference of the outer yoke; a magnetizer that includes an equal number of building blocks. Magnetic fields and magnetic materials; a set of magnetic field generators arranged within a magnetic material and including its length. An outer circumference that is significantly equal to the inner length of the magnetic material, creates a series of adjacent magnetic fields, but... And a set that creates a magnetic field with alternating polarity towards the opposite magnetic material; and a power supply device which is connected. Connect it to the magnetizer and feed a current to the magnetic field generating unit just once to create it. The magnetic field required to magnetize a material is at the center of the material. The magnet and the center of the corresponding body of the set create a magnetic field that is opposite to the magnetic material of the other body. One of the two is deflected from the other by an angle less than or equal to the angle obtained by dividing 360 degrees by that number. It is twice the amount of magnetic material in the direction along the inner circumference of the outer yoke. [Selected painting] Image 4 -----------------------------------------------------------

Description

Magnetizing device and magnetizing method

[0001] This invention relates to a technology for magnetizing magnets that constitute a magnetic coupling mechanism in a magnet-driven pump.

[0002] In recent years, market demand for pumps with magnetic coupling mechanisms, which use magnetic action to drive gears and other driving elements, has been on the rise. In the industry of pumps with magnetic coupling mechanisms, gear pumps are being used with a variety of fluids due to the increasing performance of magnets used in magnetic couplings. In particular, they are used as high-pressure generators across a wide range of rotational speeds in the constant-volume or metered transfer of high-viscosity fluids and in hydraulic power transmission devices.

[0003] Meanwhile, methods for efficiently magnetizing magnets used in the drive mechanisms of rotating machines such as motors and generators have been the subject of vigorous research and development, and many patent applications have been filed for the results of these efforts.

[0004] For example, Patent Document 1 proposes "a method for magnetizing a plurality of rare earth magnets fixed to a rotor at a high magnetization rate," and Patent Document 2 proposes "a magnetization device that can obtain, by a simple method, a high-performance magnet with as little non-magnetized portion as possible, and that can prevent yoke punctures by employing a thick-wire excitation coil."

[0005] JP 2002-124414 A JP 2002-204542 A

[0006] However, the above-mentioned conventional techniques are techniques for the drive mechanisms of large-scale rotating machines, and have the problem that they are difficult to apply to the operation of magnetizing relatively small magnetic materials.Furthermore, all of the above-mentioned conventional techniques have the problem that the overall cost of magnetizing a magnetic material is high because the magnetizing operation is performed multiple times.

[0007] In view of the above problems, an object of the present invention is to provide a magnetizing device that reduces costs by not performing the magnetizing operation multiple times and that also increases the degree of magnetization of the object to be magnetized when magnetizing a relatively small magnetic material such as a magnetic coupling mechanism that drives a magnet-driven pump.

[0008] One embodiment of the disclosed magnetization device includes a hollow cylindrical outer yoke made of a ferromagnetic material, first magnetic materials that are anisotropic magnets and are arranged on the inner surface of the outer yoke at equal intervals on the same circumference in even numbers, a first magnetic field generating unit that is arranged inside the first magnetic materials and has a circumferential length that is approximately the same as the inner length of the first magnetic materials, and is composed of an iron core and a coil wound around the iron core, and generates a magnetic field toward the opposing first magnetic materials when a current flows through the coil, and adjacent first magnetic field generating units generate magnetic fields of opposite polarity, a first magnetizer having the same number as the first magnetic materials, and a magnetization power supply unit connected to a magnet and configured to generate a magnetic field required to magnetize the first magnetic material by passing current through the coil only once, wherein the center of one of the first magnetic materials and the center of the first magnetic field generating unit facing the one of the first magnetic materials are offset in the circumferential direction inside the outer yoke by an angle equal to or less than 360° divided by twice the number of the first magnetic materials, and an outer magnet configured by the first magnetic material and the outer yoke is configured to form a magnetic coupling mechanism that drives a pump driver by magnetic coupling with an inner magnet.

[0009] The disclosed magnetizing device reduces costs by not performing the magnetizing operation multiple times when magnetizing a relatively small magnetic material, such as a magnetic coupling mechanism that drives a magnet-driven pump, and also increases the degree of magnetization of the magnetized object.

[0010] FIG. 1 is a diagram showing a structural example of an outer magnet according to the present embodiment. FIG. 2 is a diagram showing a structural example of a first magnetizer according to the present embodiment. FIG. 3 is a diagram showing a structural example of an inner magnet according to the present embodiment. FIG. 4 is a diagram explaining the positional relationship between a first magnetic material and a first magnetic field generating unit according to the present embodiment. FIG. 5 is a diagram explaining the positional relationship between a second magnetic material and a second magnetic field generating unit according to the present embodiment. FIG. 6 is a diagram showing an example of measurement results of magnetization performance by a magnetizing device according to the present embodiment. FIG. 7 is a diagram showing an example of a magnet-driven pump according to the present embodiment.

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetization device according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0012] The structure of the magnetizing device 1 according to this embodiment will be described with reference to Figures 1 to 7. Figure 1 is a cross-sectional view showing an outer magnet 24 (including an outer yoke 2 and a first magnetic material 4), and Figure 2 is a view showing a first magnetizer 6. Figure 3 is a cross-sectional view showing an inner magnet 26 (including an inner yoke 16 and a second magnetic material 18). Figures 4 and 5 are views showing the positional relationship between the magnetic materials 4, 18 and the magnetic field generating units 8, 22 during the magnetizing operation, and Figure 6 is a view showing an example of measurement results of the magnetizing performance using the magnetizing device 1. Figure 7 is a view showing the cross-sectional structure of a magnet-driven pump 30.

[0013] The magnetizing device 1 includes an outer yoke 2, a first magnetic material 4, a first magnetizer 6, a magnetization power supply 14, an inner yoke 16, a second magnetic material 18, and a second magnetizer 20. As shown in Fig. 1, the outer yoke 2 is made of a ferromagnetic material such as carbon steel and is a hollow cylindrical or cup-shaped part.

[0014] As shown in Figure 1, the first magnetic material 4 is an anisotropic magnet such as a neodymium magnet or a samarium-cobalt magnet, and is an object to be magnetized by the magnetizing device 1. An even number of the first magnetic materials 4 are arranged on the inner surface of the outer yoke 2, and are equally spaced around the same circumference. Each of the first magnetic materials 4 has approximately the same shape, although there may be slight differences. The first magnetic material 4 may have a rectangular parallelepiped shape, or may have a concentric circular shape that follows the inner surface of the outer yoke 2. In this case, it is preferable that the first magnetic materials 4 of approximately the same shape are arranged so that they are adjacent to each other.

[0015] As shown in Figure 2, the first magnetizer 6 has first magnetic field generating units 8, the same number as the first magnetic materials 4. Each 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 part that generates a magnetic field toward the opposing first magnetic material 4 when a current flows through the coil 12. The first magnetic field generating unit 8 is disposed inside the first magnetic material 4, and has a circumferential length that is approximately the same as the length of the inside of the first magnetic material 4. Adjacent first magnetic field generating units 8 each generate a magnetic field of opposite polarity.

[0016] 3, the inner yoke 16 is made of a ferromagnetic material such as carbon steel and has a cylindrical (columnar) shape. However, the inner yoke 16 may have a polygonal shape to match the shape of the magnet.

[0017] As shown in Figure 3, the second magnetic material 18 is an anisotropic magnet such as a neodymium magnet or a samarium-cobalt magnet, and is an object to be magnetized by the magnetizing device 1. An even number of the second magnetic materials 18 are arranged on the outer surface of the inner yoke 16, at equal intervals on the same circumference. Each second magnetic material 18 has approximately the same shape, although there are slight differences. The second magnetic material 18 may have a rectangular parallelepiped shape, or may have a concentric circular shape that follows the outer surface of the inner yoke 16. In this case, it is preferable that the second magnetic materials 18 of approximately the same shape are arranged so that they are adjacent to each other.

[0018] The second magnetizer 20 includes second magnetic field generating units 22 in the same number as the second magnetic materials 18. Each second magnetic field generating unit 22 is composed of an iron core 10 and a coil 12 wound around the iron core 10, and is a part that generates a magnetic field toward the opposing second magnetic material 18, which is the object to be magnetized, when a current flows through the coil 12. The second magnetic field generating units 22 are arranged outside the second magnetic material 18, and have an inner peripheral length that is approximately the same as the outer length of the second magnetic material 18. Adjacent second magnetic field generating units 22 each generate a magnetic field of opposite polarity.

[0019] The magnetization power supply 14 is connected to the first magnetizer 6 and passes a large current through the coil 12 only once to generate a large magnetic field required to magnetize the first magnetic material 4. The magnetization power supply 14 is also connected to the second magnetizer 20 and passes a large current through the coil 12 only once to generate a large magnetic field required to magnetize the second magnetic material 18.

[0020] The magnetization power supply 14 controls the AC power supply with a charging circuit, boosts the voltage with a transformer, then converts it to DC with a rectifier circuit and stores an electric charge in a capacitor bank.The magnetization power supply 14 then turns on the discharge circuit for this stored energy, instantaneously passing a large current through the coil 12 and generating the high magnetic field required for magnetization.

[0021] 4 , in the magnetizing device 1, the center of the first magnetic material 4 and the center of the first magnetic field generating unit 8 facing the first magnetic material 4 are offset in the circumferential direction inside the outer yoke 2 by an angle equal to or smaller than 360° divided by twice the number of first magnetic materials 4. In other words, in the magnetizing device 1, the ends of the first magnetic field generating unit 8 and the ends of each of the first magnetic materials 4 do not coincide with each other in the circumferential direction inside the outer yoke 2, but are offset, and the offset angle in the circumferential direction of both ends is 360° ÷ "the number of first magnetic materials 4" ÷ 2 or less.

[0022] 5 , in the magnetizing device 1, the center of the second magnetic material 18 and the center of the second magnetic field generating unit 22 facing the second magnetic material 18 are offset in the circumferential direction of the inner yoke 16 by an angle equal to or smaller than 360° divided by twice the number of the second magnetic materials 18. In other words, in the magnetizing device 1, the ends of the second magnetic field generating unit 22 and the ends of each of the second magnetic materials 18 do not coincide with each other in the circumferential direction of the inner yoke 16, but are offset, and the radial offset angle of both ends is equal to or smaller than 360° ÷ "the number of second magnetic materials 18" ÷ 2.

[0023] As described above, the reason why the centers of the magnetic materials 4, 18 and the magnetic field generating units 8, 22 are offset in the circumferential direction allows the magnetizing device 1 to reduce costs by not performing the magnetizing operation multiple times and also increases the degree of magnetization of the magnetized objects 4, 18 will be explained.

[0024] When the ends of the magnetic field generating unit and the ends of the individual magnetic materials are aligned in the circumferential direction as in conventional magnetizing devices and the magnetizing operation is performed by a magnetizing power supply, the gaps between adjacent magnetic materials become unmagnetized regions. When these unmagnetized regions exist, demagnetizing field regions are formed between the adjacent magnetic materials, and opposite poles are likely to appear there, resulting in losses.

[0025] On the other hand, when the ends of the magnetic field generating units 8, 22 and the ends of the individual magnetic materials 4, 18 are not aligned with each other in the circumferential direction but are shifted, as in the magnetization device 1, N-pole regions and S-pole regions appear in one magnetic material 4, 18. In this case, the joints between adjacent magnetic materials 4, 18 have the same polarity, and whereas in the conventional method the magnetic field is unlikely to leak out of the demagnetizing field region, the repulsive magnetic field generated at the joints generates a stronger magnetic field.

[0026] 6 shows the results of measurements of how the degree of magnetization of the magnetic materials 4, 18 by the magnetizing device 1 changes when the angle of deviation is changed, compared to full magnetization (the 100% reference line in the figure). Note that in FIG. 6, the number of first magnetic materials 4 is eight.

[0027] 6, the degree of magnetization improves as the angle of deviation increases, and when the angle of deviation is 22.5° (= 360° ÷ "number of first magnetic materials 4 = 8" ÷ 2), the degree of magnetization peaks and exceeds that of full magnetization. Note that full magnetization is achieved by applying a sufficiently strong magnetic field to the magnet itself within the air-core coil, and it is believed that the magnet at this point has nearly reached saturation magnetization.

[0028] 7 , the first magnetic material 4 and outer yoke 2, and the second magnetic material 18 and inner yoke 16 magnetized by the magnetizer 1, are used as the driving body of a pump 30. The combination of the outer yoke 2 and the first magnetic material 4 is called an outer magnet 24, and the combination of the inner yoke 16 and the second magnetic material 18 is called an inner magnet 26.

[0029] As shown in FIG. 7, the pump 30 has a configuration in which the driving body is driven by a magnetic coupling mechanism 28 formed by magnetic coupling between an outer magnet 24 and an inner magnet 26 .

[0030] Based on the above-described configuration, when magnetizing a relatively small magnetic material 4, 18 such as a magnetic coupling mechanism 28 that drives a magnet-driven pump 30, the magnetizing device 1 does not perform the magnetizing operation multiple times, thereby reducing costs and increasing the degree of magnetization of the object 4, 18 to be magnetized. (Method of Using the Magnetizing Device According to the Present Embodiment)

[0031] 4, 5, and 6, a magnetization method using the magnetizer 1 will be described. As shown in Fig. 4, in the magnetizer 1, the outer yoke 2 and the first magnetic material 4 are placed on the first magnetizer 6 so that the center of the first magnetic field generator 8 facing the first magnetic material 4 is offset in the circumferential direction inside the outer yoke 2 by an angle equal to or smaller than 360° divided by twice the number of first magnetic materials 4. In other words, in the magnetizer 1, in the circumferential direction inside the outer yoke 2, the ends of the first magnetic field generator 8 and the ends of each of the first magnetic materials 4 do not coincide with each other but are offset, and the offset angle in the circumferential direction of both ends is equal to or smaller than 360° ÷ "the number of first magnetic materials 4" ÷ 2.

[0032] In the magnetizing power supply 14, the AC power supply is controlled by a charging circuit, boosted by a transformer, and then converted to DC by a rectifier circuit, and an electric charge is stored in a capacitor bank. Then, in the magnetizing power supply 14, a discharge circuit for this stored energy is turned ON, and current is instantaneously passed through the coil 12, causing a large current to flow through the coil 12 and generating a high magnetic field required for magnetization. This magnetizing operation is performed only once for each set of outer magnets 24 formed by the outer yoke 2 and multiple first magnetic materials 4.

[0033] Also, as shown in FIG. 5 , in the magnetizing device 1, the inner yoke 16 and the second magnetic material 18 are placed on the second magnetizer 20 so that the center of the second magnetic field generating unit 22 facing the second magnetic material 18 is shifted in the circumferential direction of the inner yoke 16 by an angle equal to or smaller than 360° divided by twice the number of the second magnetic materials 18. In other words, in the magnetizing device 1, the ends of the second magnetic field generating unit 20 and the ends of the individual second magnetic materials 18 do not coincide with each other in the circumferential direction of the inner yoke 16, but are shifted, and the radial shift angle between both ends is equal to or smaller than 360° ÷ “the number of second magnetic materials 18” ÷ 2.

[0034] In the magnetizing power supply 14, the AC power supply is controlled by a charging circuit, boosted by a transformer, and then converted to DC by a rectifier circuit, and an electric charge is stored in a capacitor bank. Then, in the magnetizing power supply 14, a discharge circuit for this stored energy is turned ON, and electricity is instantaneously passed through the coil 12, causing a large current to flow through the coil 12 and generating a high magnetic field required for magnetization. This magnetizing operation is performed only once for each set of inner magnets 26 formed by the inner yoke 16 and multiple second magnetic materials 18.

[0035] 6 , the magnetization method using the magnetizer 1 as described above can improve the degree of magnetization of the magnetic materials 4, 18 at least compared to the case where the magnetic materials 4, 18 and the magnetic field generating units 8, 22 are installed without any misalignment. Furthermore, the magnetization method using the magnetizer 1 as described above can improve the degree of magnetization of the magnetic materials 4, 18 compared to the fully magnetized state when the magnitude of the misalignment between the magnetic materials 4, 18 and the magnetic field generating units 8, 22 is within a specific range.

[0036] Therefore, when magnetizing a relatively small magnetic material 4, 18 such as the magnetic coupling mechanism 28 that drives the magnet-driven pump 30, the magnetization method using the magnetizing device 1 does not require multiple magnetization operations, thereby reducing costs and increasing the degree of magnetization of the magnetized object 4, 18.

[0037] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0038] REFERENCE SIGNS LIST 1 magnetization device 2 outer yoke 4 first magnetic material 6 first magnetizer 8 first magnetic field generating unit 10 iron core 12 coil 14 magnetization power supply 16 inner yoke 18 second magnetic material 20 second magnetizer 22 second magnetic field generating unit 24 outer magnet 26 inner magnet 28 magnetic coupling mechanism 30 magnet-driven pump

Claims

DEPCT641. A magnetizing device comprising: an external yoke made of ferromagnetic material and in the shape of a hollow cylinder; a number of pairs of primary magnetic materials, which are anisotropic magnetized objects and arranged at equal intervals on the inner surface and equal circumference of the external yoke; a primary magnetizer comprising an equal number of primary magnetic field generators and primary magnetic materials; a primary magnetic field generator arranged within primary magnetic materials, with an outer circumference of material ... when current flows through the coils;Each adjacent first magnetic field generating set creates an alternating polarity magnetic field, and a magnetic power supply device is connected to the first magnetizer and supplies current to the coil only once to create the magnetic field necessary to magnetize the first magnetic material. This occurs at an angle less than or equal to the angle given by dividing 360 degrees by twice the number of magnetic materials present.In the direction along the inner circumference of the outer yoke, the external magnet created by the primary magnetic material and the outer yoke are used to form a magnetic coupling mechanism that drives the pump's drive housing by magnetic coupling with the internal magnet.

2. A magnetizing device according to point 1 where each primary magnetic material has the same shape.

3. A magnetizing device according to point 1 or 2 where the primary magnetic material has a concentric circle along the inner surface of the outer yoke and significantly identical primary magnetic materials are arranged to be connected.

4. A magnetizing method using a magnetizing device with an outer yoke made of ferromagnetic material and in the shape of a hollow cylinder, a number of pairs of primary magnetic materials, which are magnetized objects made of anisotropic magnets and arranged at equal intervals on the inner surface and equal circumference of the outer yoke.The first magnetizer, which includes an equal number of magnetic field generator sets and the first magnetic material, consists of magnetic field generator sets arranged within the first magnetic material, with an outer circumference significantly equal to the inner length of the first magnetic material. These are generated by an iron core and coils wound around the iron core, creating a magnetic field on the opposite side of the first magnetic material when current flows through the coils. Each adjacent magnetic field generator set creates an alternating polarity magnetic field, and a magnetic power supply is connected to the first magnetizer, supplying current to the coils to generate the necessary magnetic field for magnetizing the first magnetic material. The magnetization method involves: deflecting the center of one of the first magnetic materials and the center of one of the magnetic field generator sets opposite to the first magnetic material by an angle less than or equal to the specified angle.This is obtained by dividing 360 degrees by twice the number of the first magnetic material.In the direction along the inner circumference of the outer yoke, the current is fed to create the necessary magnetic field for magnetizing the first magnetic material from the magnetic power supply device to the coil only once, causing each set of the first magnetic field generators to have alternating polarity. This magnetizes the first magnetic material, where the external magnet created by the first magnetic material and the outer yoke is used to form the magnetic coupling mechanism that drives the pump's drive frame by coupling the magnet with the internal magnet.

5. The magnetization method according to point 4, where each first magnetic material has the same shape.

6. The magnetization method according to point 4 or 5, where the first magnetic material has a concentric circle along the inner surface of the outer yoke, and significantly identical first magnetic materials are arranged to be connected together.