JP7443585B1 - Magnetizing device and method - Google Patents

Abstract

The present invention provides a magnetizing device and method for easily and safely producing magnets arranged according to the Halbach array. The magnetizing device is a device that magnetizes a magnet material unit including a unit magnet material unit consisting of four magnet materials 51 to 54 according to a Halbach arrangement, and includes a coil unit 5 and at least one magnet material unit connected to the coil unit. one power supply circuit; The coil unit includes a unit coil unit 10 made up of coils 11 to 16, the number of which is a multiple of three, wound around an axis along the first direction D1. The coils of the unit coil unit 10 are arranged in the first direction D1. The lengths of the coils 11 to 16 of the unit coil unit 10 are equal to each other. [Selection diagram] Figure 1

Description

Embodiments of the present invention relate to a magnetizing device and a magnetizing method.

In recent years, the application of magnets arranged according to the Halbach array to various devices has been studied. Magnets arranged according to the Halbach array can concentrate magnetic flux on one side of the magnet. As a result, magnetization energy can be used efficiently, and a stronger magnetic force can be obtained with a magnet of the same volume. For example, when magnets arranged according to the Halbach array are applied to an eddy current brake device, braking force can be effectively exerted by concentrating the magnetic flux of the magnets on the side facing the rail. The application of eddy current brake devices to elevators and railways is being considered.

Here, when arranging a plurality of magnets according to the Halbach arrangement, the following problem exists. In the Halbach array, the magnetization directions of adjacent magnets differ by 90°. Therefore, the magnets are likely to rotate due to the magnetic force acting between adjacent magnets. Therefore, it is difficult to arrange the magnets according to the Halbach array. Furthermore, when arranging the magnets manually, there is a risk of injury from getting your hand caught between the magnets.

In consideration of these problems, in Patent Document 1, magnets arranged according to the Halbach array are manufactured as follows. That is, first, a magnet material unit is produced by arranging a plurality of magnet materials in a row and fixing them to a bendable base material. Next, by bending the base material and folding the magnet material unit, adjacent magnets are rotated 90 degrees with respect to each other. Place the folded magnet material unit in a uniform magnetic field and magnetize it. Thereafter, the base material is developed and adjacent magnets are rotated relative to each other to form a magnet unit whose magnetization direction follows the Halbach array. However, the magnets used in eddy current brake devices applied to elevators and railways have strong magnetic force, making it difficult to develop the base material. Further, when the base material is expanded, there is a risk that the base material may be damaged.

Furthermore, in Patent Document 2, a single magnet material is divided into three regions, and these regions are magnetized in different magnetization directions. However, according to this method, in order to control the magnetization direction of each region, not only is a complicated device required, but also it is necessary to perform the magnetization operation multiple times on one magnet material.

JP2003-347121A Japanese Patent Application Publication No. 2010-130819

On the other hand, there is a need to easily and safely produce magnets arranged according to the Halbach array.

The present invention has been made in consideration of these points, and an object of the present invention is to easily and safely produce magnets arranged according to the Halbach array.

The magnetizing device according to the present embodiment is a magnetizing device that magnetizes a magnet material unit including a unit magnet material unit made of four magnet materials according to a Halbach array,
a coil unit including a unit coil unit made up of a number of coils that are a multiple of 3 and are wound around an axis along a first direction;
at least one power supply circuit connected to the coil unit;
Equipped with
The coils of the unit coil unit are arranged in the first direction,
The lengths of the coils of the unit coil unit are equal to each other,
When viewed in the first direction, the winding direction of the coils of the unit coil unit whose number is the same as the largest integer less than or equal to the value obtained by dividing the number of coils of the unit coil unit by 2 is the same as that of the other unit coil units. This is the opposite direction to the coil winding direction.

Alternatively, the magnetization method according to the present embodiment is a magnetization method in which a magnet material unit including a unit magnet material unit made of four magnet materials is magnetized according to the Halbach array,
A coil unit including a unit coil unit made up of coils whose number is a multiple of 3 wound around an axis line along a first direction, the coil unit forming a coil unit in which the coils are arranged in the first direction. Coil unit forming process,
a power circuit connecting step of connecting at least one power circuit to the coil unit;
a magnet material unit forming step of arranging the magnet materials along a second direction to form a magnet material unit;
a magnet material unit arranging step of arranging the magnet material unit to face an inner circumferential surface or an outer circumferential surface of the coil unit so that the second direction is along the first direction;
After the magnet material unit arrangement step, an excitation step of causing current to flow through each coil through the power supply circuit to excite each coil;
Equipped with
The lengths of the coils of the unit coil unit along the first direction are equal to each other,
The lengths of the magnetic materials of the magnetic material units along the second direction are equal to each other,
The length of the unit coil unit along the first direction is equal to the length of the unit magnet material unit along the second direction,
When viewed in the first direction, the winding direction of the coils of the unit coil unit whose number is the same as the largest integer less than or equal to the value obtained by dividing the number of coils of the unit coil unit by 2 is the same as that of the other unit coil units. This is the opposite direction to the coil winding direction.

FIG. 1 is a perspective view showing a coil unit of a magnetizing device according to a first embodiment. FIG. 2 is a circuit diagram showing the overall configuration of the magnetizing device according to the first embodiment. FIG. 3 is a circuit diagram showing the overall configuration of the power supply circuit shown in FIG. 2. FIG. 4 is a diagram for explaining the magnetization method according to the first embodiment, and is a diagram for explaining the value of the current flowing through each coil of the coil unit and the magnetization direction of the magnet material unit. FIG. 5 is a diagram showing the magnetized state of the magnet material unit magnetized by the method shown in FIG. 4. FIG. 6 is a perspective view showing a coil unit of a magnetizing device according to a second embodiment. FIG. 7 is a diagram for explaining the magnetization method according to the second embodiment, and is a diagram for explaining the value of the current flowing through each coil of the coil unit and the magnetization direction of the magnet material unit. FIG. 8 is a diagram showing the magnetized state of the magnet material unit magnetized by the method shown in FIG. 7. FIG. 9 is a circuit diagram showing the overall configuration of a magnetizing device according to a third embodiment. FIG. 10 is a diagram for explaining the magnetization method according to the third embodiment, and is a diagram for explaining the value of the current flowing through each coil of the coil unit and the magnetization direction of the magnet material unit. FIG. 11 is a diagram showing the magnetized state of the magnet material unit magnetized by the method shown in FIG. 10. FIG. 12 is a diagram corresponding to FIG. 1, and is a diagram showing a modification of the magnetizing device and the magnetizing method. FIG. 13 is a diagram corresponding to FIG. 1 and illustrating a modification of the magnetization method. FIG. 14 is a diagram corresponding to FIG. 1 and illustrating a modification of the magnetization method.

<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a coil unit 5 of a magnetizing device 1 according to the first embodiment, and FIG. 2 is a circuit diagram showing the overall configuration of the magnetizing device 1. The illustrated magnetizing device 1 is a device for magnetizing a magnet material unit 6 including a plurality of magnet materials 51 to 54 according to the Halbach arrangement.

The magnetizing device 1 includes a coil unit 5 and power circuits 31, 32, and 33 connected to the coil unit 5.

The coil unit 5 includes a unit coil unit 10 consisting of coils whose number is a multiple of three. In the illustrated example, the coil unit 5 includes a unit coil unit 10 consisting of six coils. The unit coil unit 10 includes a first coil 11, a second coil 12, a third coil 13, a fourth coil 14, a fifth coil 15, and a sixth coil 16. The unit coil unit 10 has one end 10a and the other end 10b.

Each of the coils 11, 12, 13, 14, 15, and 16 included in the coil unit 5 is wound around an arbitrary axis. Each of the coils 11, 12, 13, 14, 15, and 16 is arranged such that the direction in which its axis extends (hereinafter also referred to as the "axial direction") is along the first direction D1. Further, the first coil 11, the second coil 12, the third coil 13, the fourth coil 14, the fifth coil 15, and the sixth coil 16 are arranged in this order along the first direction D1. The length of the unit coil unit 10 along the first direction D1 is L.

Each coil 11, 12, 13, 14, 15, 16 has a first end 18 and a second end 19. When viewed from the first end 18 to the second end 19, the winding directions of the coils 11, 12, 13, 14, 15, and 16 are the same. In the illustrated example, each coil 11, 12, 13, 14, 15, 16 is an air-core coil. Each coil 11, 12, 13, 14, 15, 16 may be wound around a non-magnetic and non-conductive core material. Since the core materials of the coils 11, 12, 13, 14, 15, and 16 are nonmagnetic and nonconductive, generation of eddy current in the core materials when the coil unit 5 generates a magnetic field is suppressed. , and the magnetic field can be efficiently used to magnetize the magnet materials 51 to 54.

The lengths along the axial direction and the cross-sectional areas perpendicular to the axial direction of the coils 11, 12, 13, 14, 15, and 16 included in the coil unit 5 are the same. The length, thickness, and number of turns of the conducting wires constituting the coils 11, 12, 13, 14, 15, and 16 are also the same. The coils 11, 12, 13, 14, 15, and 16 in the unit coil unit 10 are evenly arranged within a region of length L along the first direction D1. Further, the gaps between adjacent coils 11, 12; 12, 13; 13, 14; 14, 15; 15, 16 are sufficiently small.

In order to suppress changes in the relative positions of the coils 11, 12, 13, 14, 15, and 16, the coil unit 5 may be fitted into a mold (not shown). This also suppresses deformation of the coils 11, 12, 13, 14, 15, and 16.

When viewed in the first direction D1, the winding direction of some of the coils in the unit coil unit 5 is opposite to the winding direction of some other coils in the unit coil unit 5. More specifically, when viewed in the first direction D1, the winding direction of the coils of the unit coil unit 5 whose number is equal to the largest integer less than or equal to the value obtained by dividing the number of coils of the unit coil unit 5 by 2 is: This is the opposite direction to the winding direction of the other coils in the unit coil unit 5. In the illustrated example, when viewed in the first direction D1, the first coil 11, the second coil 12, and the sixth coil 16 are wound in the first winding direction, and the third coil 13 and the fourth coil are wound in the first winding direction. 14 and a fifth coil 15 are wound in a second winding direction opposite to the first winding direction.

As shown in FIG. 2, the first coil 11 and the fourth coil 14 are connected in series to form a first coil pair 21. More specifically, the second end 19 of the first coil 11 and the second end 19 of the fourth coil 14 are connected. Further, the second coil 12 and the fifth coil 15 are connected in series to form a second coil pair 22. More specifically, the second end 19 of the second coil 12 and the second end 19 of the fifth coil 15 are connected. Further, the third coil 13 and the sixth coil 16 are connected in series to form a third coil pair 23. More specifically, the first end 18 of the third coil 13 and the first end 18 of the sixth coil 16 are connected.

As shown in FIG. 2, the magnetizing device 1 includes a first power supply circuit 31, a second power supply circuit 32, and a third power supply circuit 33. The first power supply circuit 31 is connected to the first coil pair 21. The second power supply circuit 32 is connected to the second coil pair 22. The third power supply circuit 33 is connected to the third coil pair 23.

FIG. 3 is a circuit diagram showing the overall configuration of the power supply circuits 31, 32, and 33. The power supply circuits 31, 32, 33 can be used as shown in the diagram, as long as they flow a current of the magnitude described later in the coils 11, 14; 12, 15; 13, 16 connected to the power supply circuits 31, 32, 33. Not limited to things. In the example shown in FIG. 3, each power supply circuit 31, 32, 33 includes a booster circuit 41, a rectifier 42, a capacitor 43, and a switch 44. The booster circuit 41 of each power supply circuit 31, 32, 33 is connected to an AC power supply 47 via a charging control circuit 46 shown in FIG.

In the illustrated power supply circuits 31, 32, and 33, when the capacitor 43 is charged with the switch 44 open, the AC power that has passed through the charging control circuit 46 is boosted by the booster circuit 41, passes through the rectifier 42, and becomes a positive voltage. and charges the capacitor 43. After charging of the capacitor 43 is completed, by closing the switch 44, a large amount is instantaneously transferred from the capacitor 43 to the coils 11, 14; 12, 15; 13, 16 connected to the output terminals of the power supply circuits 31, 32, 33. A current is released. As a result, a strong magnetic field is generated around the coils 11, 14; 12, 15; 13, 16, and the magnet materials 51 to 54 placed near the coil unit 5 are magnetized. As shown in Figure 3, between the capacitor 5 and the coils 11, 14; 12, 15; A current adjustment load 45 may be inserted to adjust the size.

The first power supply circuit 31, the second power supply circuit 32, and the third power supply circuit 33 are configured such that a current of a predetermined value flows through the coils 11, 14; 12, 15; 13, 16 connected to each. There is. In the illustrated example, the value of the current flowing through the coils 11, 14; 12, 15; This is the value of the reference value R(x) expressed by any one of 1) to (4) at the axial center position of the coils 11, 14; 12, 15; 13, 16.
R(x)=αsin (2π(x-L/8)/L)...(1)
R(x)=αsin (2π(x-3L/8)/L)...(2)
R(x)=αsin (2π(x-5L/8)/L)...(3)
R(x)=αsin (2π(x-7L/8)/L)...(4)
Here, in the above equations (1) to (4), α is an arbitrary constant, L is the total length of the unit coil unit 10, and x is the distance between one end 10a of the unit coil unit 10 and the axial direction. This is the distance along the first direction D1 from the center position of each coil 11, 12, 13, 14, 15, 16. Furthermore, in the above equations (1) to (4), the current value of the current flowing from the first end 18 to the second end 19 is expressed as a positive value, and from the second end 19 to the first end 18 The current value of the current flowing to is expressed as a negative value.

In the example shown in FIG. 4, the value of the current flowing through each coil 11, 12, 13, 14, 15, 16 is the reference value R(x) expressed by the above equation (4). , 13, 14, 15, and 16 at the center position in the axial direction. In the graph of FIG. 4, the reference value R(x) is shown by a broken line, and the value of the current flowing through each coil 11, 12, 13, 14, 15, 16 is shown by a solid line. More specifically, the value I1 of the current flowing through the first coil 11 is R(L/12), the value I2 of the current flowing through the second coil 12 is R(L/4), and the value I1 of the current flowing through the second coil 12 is R(L/4). The value I3 of the current flowing through is R (5L/12), the value I4 of the current flowing through the fourth coil 14 is R (7L/12), and the value I5 of the current flowing through the fifth coil 15 is R (3L/12). 4), and the value I6 of the current flowing through the sixth coil 16 is R(11L/12). Further, in the example shown in FIG. 4, if the ratio of I1, I2, I3, I4, I5, and I6 is expressed in two significant digits, I1:I2:I3:I4:I5:I6=0.97:0. 71:-0.26:-0.97:-0.71:0.26. By passing current through the first to sixth coils 11 to 16 in this manner, the magnet material unit 6 disposed facing the coil unit 5 can be magnetized according to the Halbach arrangement.

Next, the magnet material unit 6 will be explained. The magnet material unit 6 includes a unit magnet material unit 50. The unit magnet material unit 50 consists of four magnet materials 51, 52, 53, and 54. The unit magnet material unit 50 includes a first magnet material 51, a second magnet material 52, a third magnet material 53, and a fourth magnet material 54. The magnet materials 51, 52, 53, and 54 may be made of a magnetic material commonly used as a material for magnets or permanent magnets. As shown in FIG. 1, the magnet members 51, 52, 53, and 54 may be rectangular parallelepipeds.

The first magnet material 51, the second magnet material 52, the third magnet material 53, and the fourth magnet material 54 are arranged in this order along the second direction D2. The magnetic materials 51, 52, 53, and 54 are fixed to each other. For example, the magnet materials 51, 52, 53, and 54 may be fixed to each other by being bonded to a base material (not shown). In this case, the base material is preferably made of a highly rigid material so that the magnet materials 51, 52, 53, and 54 do not move relative to each other after being magnetized. The unit magnet material unit 50 has one end 50a and the other end 50b.

The length of the unit magnet material unit 50 along the second direction D2 is L. The lengths of the magnet materials 51, 52, 53, and 54 along the second direction D2 are equal to each other. The magnet materials 51, 52, 53, and 54 in the unit magnet material unit 50 are evenly arranged within a region of length L along the second direction D2. Moreover, the gaps between adjacent magnet materials 51, 52; 52, 53; 53, 54 are sufficiently small.

When a third direction D3 perpendicular to the second direction D2 and a fourth direction D4 perpendicular to the second direction D2 and the third direction D3 are defined, the unit magnet material unit 50 is configured to act in the second direction D2 and the third direction D3. A first surface 50i and a second surface 50ii that spread out, a third surface 50iii and a fourth surface 50iv that spread in the second direction D2 and a fourth direction D4, and a fifth surface 50v that spread in the third direction D3 and the fourth direction D4. The sixth side has 50vi. The fifth surface 50v and the sixth surface 50vi form one end 50a and the other end 50b of the unit magnet material unit 50, respectively.

When the magnet material unit 6 is magnetized by the magnetizing device 1, the magnet material unit 6 is arranged so that the second direction D2 is along the first direction D1. The magnet material unit 6 is arranged so that the first surface 50i faces the outer peripheral surface 5a or the inner peripheral surface 5b of the coil unit 5. In other words, the magnet material unit 6 is arranged so that the direction from the magnet material unit 6 toward the coil unit 5 is along the fourth direction D4.

When magnetizing the magnet material unit 6, the center position of each magnet material 51, 52, 53, 54 in the second direction D2 is set so that the reference value R(x) is the maximum value, the minimum value, or It is positioned with respect to the coil unit 5 so as to coincide with the zero position in the first direction D1 (that is, to face the fourth direction D4). In the example shown in FIG. 4, in the first direction D1, the positions of one end 50a and the other end 50b of the unit magnet material unit 50 are the positions of the one ends 10a and 10b of the unit coil unit 10, respectively. The magnet material unit 6 is positioned with respect to the coil unit 5 so as to match in the first direction D1.

The magnet materials 51, 52, 53, and 54 may be isotropic magnets or may be anisotropic magnets. When the magnet materials 51, 52, 53, and 54 are anisotropic magnets, the magnet materials 51, 52, 53, and 54 are arranged so that the direction of easy magnetization thereof is along the second direction D2 or the fourth direction D4. be done. In FIGS. 1 and 4, the direction of easy magnetization of each magnet material 51, 52, 53, 54 is indicated by a solid double-headed arrow. As shown in FIGS. 1 and 4, the easy magnetization directions of adjacent magnet materials 51, 52; 52, 53; 53, 54 in the magnet material unit 6 form 90 degrees with respect to each other.

In addition, when the magnet materials 51, 52, 53, and 54 are anisotropic magnets, the easy magnetization direction of each magnet material 51, 52, 53, and 54 is determined when the magnet material unit 6 is positioned relative to the coil unit 5. Then, the magnet materials 51, 52, 53, and 54 are arranged in a direction corresponding to the reference value R(x). Specifically, as shown in FIG. 4, a magnet is placed at a position in the first direction D1 that matches the position where the reference value R(x) takes the maximum value or the minimum value (a position facing the fourth direction). so that the direction of easy magnetization of the materials 51 and 53 is along the second direction D2, and at the same position in the first direction D1 as the position where the reference value R(x) takes zero (a position facing the fourth direction). The magnet materials 51, 52, 53, and 54 are arranged so that the direction of easy magnetization of the arranged magnet materials 52, 54 is along the fourth direction D4. In the illustrated example, the reference value R(x) is expressed by formula (4), and as shown in FIG. 1, the easy magnetization direction of the first magnet material 51 and the third magnet material 53 is in the second direction D2. The magnet materials 51, 52, 53, and 54 are arranged along the fourth direction D4, and so that the easy magnetization direction of the second magnet material 52 and the fourth magnet material 54 is along the fourth direction D4. Note that even when the reference value R(x) is expressed by the above formula (2), the easy magnetization direction of the first magnet material 51 and the third magnet material 53 is set along the second direction D2, and The magnet materials 51, 52, 53, and 54 are arranged so that the easy magnetization directions of the second magnet material 52 and the fourth magnet material 54 are along the fourth direction D4. On the other hand, when the reference value R(x) is expressed by the above formula (1) or (3), the easy magnetization direction of the first magnet material 51 and the third magnet material 53 is along the fourth direction D4. , and the magnet materials 51, 52, 53, and 54 are arranged so that the easy magnetization direction of the second magnet material 52 and the fourth magnet material 54 is along the second direction D2.

Next, a method of magnetizing the magnet material unit 6 using the magnetizing device 1 will be explained.

First, a coil unit forming step is performed. Specifically, the coils 11 to 16 are arranged along the first direction D1. At this time, the coils 11 to 16 are arranged so that the axial directions of the coils 11 to 16 are along the first direction D1. Further, the first coil pair 21 is produced by connecting the first coil 11 and the fourth coil 14 in series. Further, the second coil 12 and the fifth coil 15 are connected in series to produce a second coil pair 22. Further, the third coil 13 and the sixth coil 16 are connected in series to produce a third coil pair 23.

In addition, a power supply circuit connection process is performed. Specifically, the first to third power supply circuits 31 to 33 are connected to the first to third coil pairs 21 to 23, respectively.

Further, a magnet material unit forming step is performed. Specifically, a plurality of non-magnetized magnet members 51, 52, 53, and 54 are arranged along the second direction D2 and fixed to each other.

Next, a magnet material unit arrangement step is performed. Specifically, the magnet material unit 6 is placed facing the coil unit 5 of the magnetizing device 1. At this time, as shown in FIG. 1, the magnet material unit 6 is arranged so that the second direction D2 of the magnet material unit 6 is along the first direction D1. Moreover, the magnet material unit 6 is arranged so that the first surface 50i of the unit magnet material unit 50 faces the outer circumferential surface 5a or the inner circumferential surface 5b of the coil unit 5. Further, as shown in FIG. 4, the center position of each magnet material 51, 52, 53, 54 in the second direction D2 is the first The magnet material units 6 are arranged so as to coincide in the direction D1. In the example shown in FIG. 4, the positions of one end 50a and the other end 50b of the unit magnet material unit 50 are the same as those of the one end 10a and the other end 10b of the unit coil unit 10 in the first direction D1. Arrange the magnet material unit 6 so that it coincides with the position. By placing a plate (not shown) made of a non-magnetic and non-conductive material between the coil unit 5 and the magnet unit 6, the distance between the coil unit 5 and the magnet unit 6 can be kept constant. Good too.

Next, an excitation process is performed. Specifically, the capacitors 43 of the first to third power supply circuits 31 to 33 are charged. After charging the capacitor 43 and arranging the magnet material unit 6 at an appropriate position relative to the coil unit 5, the switches 44 of the first to third power supply circuits 31 to 33 are simultaneously closed to excite the coils 11 to 16. do. As a result, the magnet materials 51 to 54 of the magnet material unit 6 are magnetized.

In FIG. 4, the magnetization direction of each magnet material 51 to 54 is indicated by a broken arrow. As shown in FIG. 4, the first magnet material 51 and the third magnet material 53 are magnetized so that the magnetization direction is along the second direction D2. The magnetization direction of the first magnet material 51 and the magnetization direction of the third magnet material 53 differ by 180 degrees. Further, the second magnet material 52 and the fourth magnet material 54 are magnetized so that the magnetization direction is along the fourth direction D4. The magnetization direction of the second magnet material 52 and the magnetization direction of the fourth magnet material 54 differ by 180 degrees.

FIG. 5 shows the magnetized state of a magnet unit produced by magnetizing the magnet material unit 6 using the magnetizing device 1 and magnetizing method according to the first embodiment, and the arrangement of the magnets after magnetization according to the Halbach arrangement. It is a graph which shows the result of analyzing the magnetization state of the conventional magnet unit produced by. More specifically, FIG. 5 shows the distribution of the fourth direction component By _D4 of the magnetic flux density at a position a/2 apart from the first surface 50i. Here, a is the dimension of the magnet material unit 6 in the fourth direction D4. In FIG. 5, the magnetized state of the magnet material unit 6 magnetized by the magnetizing device 1 and the magnetizing method according to the first embodiment is shown by a solid line. Further, in FIG. 5, the magnetized state of the conventional magnet unit is shown by a broken line. As shown in FIG. 5, the distribution of magnetic flux density of the magnet unit produced by the method of the first embodiment in the fourth direction D4 has a sinusoidal shape with less distortion, similar to the magnet unit produced by the conventional method. It shows. Further, the magnitude of the magnetic flux density of the magnet unit produced by the method of the first embodiment is equivalent to that of the magnet material unit produced by the conventional method.

As described above, according to the first embodiment, since the magnet materials 51 to 54 that are not magnetized are arranged and fixed to each other and then magnetized, the magnet materials 51 to 54 are magnetized and then resist the magnetic force. There is no need to arrange them. Further, the magnet material unit 6 including a plurality of magnet materials 51 to 54 can be magnetized in one magnetization operation. Moreover, a complicated jig or device for magnetizing the magnet material unit 6 is not required.

<Second embodiment>
Next, a magnetizing device 1 and a magnetizing method according to a second embodiment will be described with reference to FIGS. 6 to 8. FIG. 6 is a perspective view showing the coil unit 5 of the magnetizing device 1 according to the second embodiment. FIG. 7 is a diagram corresponding to FIG. 4. FIG. 8 is a diagram corresponding to FIG. 5. The second embodiment shown in FIGS. 6 to 8 differs from the first embodiment in that the unit coil unit 10 includes three coils 11, 12, and 13. The other configurations are substantially the same as the first embodiment shown in FIGS. 1 to 5. In the second embodiment shown in FIGS. 6 to 8, the same parts as in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The coil unit 5 includes a unit coil unit 10 consisting of three coils 11-13. The unit coil unit 10 includes a first coil 11, a second coil 12, and a third coil 13.

Each of the coils 11, 12, and 13 included in the coil unit 5 is wound around an arbitrary axis. Each coil 11, 12, 13 is arranged so that the axial direction thereof is along the first direction D1. Further, the first coil 11, the second coil 12, and the third coil 13 are arranged in this order along the first direction D1. The length of the unit coil unit 5 along the first direction D1 is L.

Each coil 11, 12, 13, 14, 15, 16 has a first end 18 and a second end 19. When viewed from the first end 18 to the second end 19, the winding directions of the coils 11, 12, 13, 14, 15, and 16 are the same.

The lengths along the axial direction and the cross-sectional areas perpendicular to the axial direction of the coils 11, 12, 13, 14, 15, and 16 included in the coil unit 5 are the same. The length, thickness, and number of turns of the conducting wires constituting the coils 11, 12, 13, 14, 15, and 16 are also the same. The coils 11, 12, 13, 14, 15, and 16 in the unit coil unit 10 are evenly arranged within a region of length L along the first direction D1. Further, the gaps between adjacent coils 11, 12; 12, 13; 13, 14; 14, 15; 15, 16 are sufficiently small.

Also in the second embodiment, when viewed in the first direction D1, the winding direction of the coils of the unit coil unit 5 is the same as the largest integer less than or equal to the value obtained by dividing the number of coils of the unit coil unit 5 by 2. , which is the opposite direction to the winding direction of the other coils of the unit coil unit 5. In the illustrated example, when viewed in the first direction D1, the first coil 11 and the third coil 13 are wound in the first winding direction, and the second coil 12 is wound in the second winding direction. has been done.

The first coil 11 is connected to a first power supply circuit 31. The second coil 12 is connected to a second power supply circuit 32. The third coil 13 is connected to a third power supply circuit 33.

Also in the second embodiment, the values of the currents flowing through the coils 11, 12, 13 connected to the power supply circuits 31, 32, 33 through the respective power supply circuits 31, 32, 33 are determined by the above equations (1) to (4). ) is the value at the center position of the coils 11, 12, 13 in the axial direction.

In the example shown in FIG. 7, the value of the current flowing through each coil 11, 12, 13 is the value of the reference value R(x) expressed by the above equation (4) in the axial direction of the coil 11, 12, 13. This is the value at the center position. In the graph of FIG. 7, the reference value R(x) is shown by a broken line, and the value of the current flowing through each coil 11, 12, 13 is shown by a solid line. More specifically, the value I1 of the current flowing through the first coil 11 is R(L/6), the value I2 of the current flowing through the second coil 12 is R(L/2), and the value I2 of the current flowing through the second coil 12 is R(L/2). The value I3 of the current flowing through is R(5L/6). Furthermore, in the example shown in FIG. 7, the ratio of I1, I2, and I3 is expressed in two significant digits as I1:I2:I3=0.97:-0.71:-0.26. By passing current through the first to third coils 11 to 13 in this manner, the magnet material unit 6 disposed facing the coil unit 5 can be magnetized in accordance with the Halbach arrangement.

Next, a method of magnetizing the magnet material unit 6 using the magnetizing device 1 according to the second embodiment will be explained.

First, a coil unit forming step is performed. Specifically, the coils 11 to 13 are arranged along the first direction D1. At this time, the coils 11 to 13 are arranged so that the axial directions of the coils 11 to 16 are along the first direction D1.

In addition, a power supply circuit connection process is performed. Specifically, the first to third power supply circuits 31 to 33 are connected to the first to third coils 11 to 13, respectively.

Further, a magnet material unit forming step is performed. Specifically, a plurality of non-magnetized magnet members 51, 52, 53, and 54 are arranged along the second direction D2 and fixed to each other.

Next, a magnet material unit arrangement step is performed. Specifically, the magnet material unit 6 is placed facing the coil unit 5 of the magnetizing device 1. At this time, as shown in FIG. 6, the magnet material unit 6 is arranged so that the second direction D2 of the magnet material unit 6 is along the first direction D1. Moreover, the magnet material unit 6 is arranged so that the first surface 50i of the unit magnet material unit 50 faces the outer circumferential surface 5a or the inner circumferential surface 5b of the coil unit 5. Moreover, as shown in FIG. 7, the center position of each magnet material 51, 52, 53, 54 in the second direction D2 is the position where the reference value R(x) takes the maximum value, minimum value, or zero, and The magnet material units 6 are arranged so as to coincide in one direction D1. In the example shown in FIG. 7, the positions of one end 50a and the other end 50b of the unit magnet material unit 50 are the same as those of the one end 10a and the other end 10b of the unit coil unit 10 in the first direction D1. Arrange the magnet material unit 6 so that it coincides with the position.

Next, an excitation process is performed. Specifically, the capacitors 43 of the first to third power supply circuits 31 to 33 are charged. After charging the capacitor 43 and arranging the magnet material unit 6 at an appropriate position relative to the coil unit 5, the switches 44 of the first to third power supply circuits 31 to 33 are simultaneously closed to excite the coils 11 to 13. do. As a result, the magnet materials 51 to 54 of the magnet material unit 6 are magnetized.

In FIG. 7, the magnetization direction of each magnet material 51 to 54 is indicated by a broken arrow. As shown in FIG. 7, the first magnet material 51 and the third magnet material 53 are magnetized so that the magnetization direction is along the second direction D2. The magnetization direction of the first magnet material 51 and the magnetization direction of the third magnet material 53 differ by 180 degrees. Further, the second magnet material 52 and the fourth magnet material 54 are magnetized so that the magnetization direction is along the fourth direction D4. The magnetization direction of the second magnet material 52 and the magnetization direction of the fourth magnet material 54 differ by 180 degrees.

FIG. 8 shows the magnetized state of a magnet unit produced by magnetizing the magnet material unit 6 using the magnetizing device 1 and magnetizing method according to the second embodiment, and the arrangement of the magnets after magnetization according to the Halbach arrangement. It is a graph which shows the result of analyzing the magnetization state of the conventional magnet unit produced by. More specifically, FIG. 8 shows the distribution of the fourth direction component By _D4 of the magnetic flux density at a position a/2 apart from the first surface 50i. Here, a is the dimension of the magnet material unit 6 in the fourth direction D4. In FIG. 8, the magnetized state of the magnet material unit 6 magnetized by the magnetizing device 1 and magnetizing method according to the second embodiment is shown by a solid line. Moreover, in FIG. 8, the magnetized state of the conventional magnet unit is shown by a broken line. As shown in FIG. 8, the distribution of magnetic flux density of the magnet unit produced by the method of the first embodiment in the fourth direction D4 has a sinusoidal shape with less distortion, similar to the magnet unit produced by the conventional method. It shows. Further, the magnitude of the magnetic flux density of the magnet unit produced by the method of the second embodiment is equivalent to that of the magnet material unit produced by the conventional method.

As described above, according to the second embodiment, since the magnet materials 51 to 54 that are not magnetized are arranged and fixed to each other and then magnetized, the magnet materials 51 to 54 are magnetized and then resist the magnetic force. There is no need to arrange them. Further, the magnet material unit 6 including a plurality of magnet materials 51 to 54 can be magnetized in one magnetization operation. Further, a complicated jig or device for magnetizing the magnet material unit 6 is not required.

<Third embodiment>
Next, a magnetizing device 1 and a magnetizing method according to a third embodiment will be described with reference to FIGS. 9 to 11. FIG. 9 is a circuit diagram showing a magnetizing device 1 according to the third embodiment. FIG. 10 is a diagram corresponding to FIG. 4. FIG. 11 is a diagram corresponding to FIG. 5. The third embodiment shown in FIGS. 9 to 11 differs from the first embodiment in that the magnetizing device 1 includes one power supply circuit 31 for one unit coil unit 10. The other configurations are substantially the same as the first embodiment shown in FIGS. 1 to 5. In the third embodiment shown in FIGS. 9 to 11, parts similar to those in the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

The magnetizing device 1 includes a coil unit 5 and a power supply circuit 31 connected to the coil unit 5.

The coil unit 5 includes a unit coil unit 10 consisting of six coils. The unit coil unit 10 includes a first coil 11, a second coil 12, a third coil 13, a fourth coil 14, a fifth coil 15, and a sixth coil 16.

Each of the coils 11, 12, 13, 14, 15, and 16 included in the coil unit 5 is wound around an arbitrary axis. Each of the coils 11, 12, 13, 14, 15, and 16 is arranged such that its axial direction is along the first direction D1. Further, the first coil 11, the second coil 12, the third coil 13, the fourth coil 14, the fifth coil 15, and the sixth coil 16 are arranged in this order along the first direction D1. The length of the unit coil unit 10 along the first direction D1 is L.

Each coil 11, 12, 13, 14, 15, 16 has a first end 18 and a second end 19. When viewed from the first end 18 to the second end 19, the winding directions of the coils 11, 12, 13, 14, 15, and 16 are the same.

The lengths along the axial direction of the coils 11, 12, 13, 14, 15, and 16 included in the coil unit 5 have the same cross-sectional area perpendicular to the axial direction. The length, thickness, and number of turns of the conducting wires constituting the coils 11, 12, 13, 14, 15, and 16 are also the same. The coils 11, 12, 13, 14, 15, and 16 in the unit coil unit 10 are evenly arranged within a region of length L along the first direction D1. Further, the gaps between adjacent coils 11, 12; 12, 13; 13, 14; 14, 15; 15, 16 are sufficiently small.

Also in the third embodiment, when viewed in the first direction D1, the winding direction of the coils of the unit coil unit 5 is the same as the largest integer less than or equal to the value obtained by dividing the number of coils of the unit coil unit 5 by 2. , which is the opposite direction to the winding direction of the other coils of the unit coil unit 5. In the illustrated example, when viewed in the first direction D1, the first coil 11, the second coil 12, and the sixth coil 16 are wound in the first winding direction, and the third coil 13 and the fourth coil are wound in the first winding direction. 14 and the fifth coil 15 are wound in the second winding direction.

As shown in FIG. 9, the first coil 11 and the fourth coil 14 are connected in series to form a first coil pair 21. More specifically, the second end 19 of the first coil 11 and the second end 19 of the fourth coil 14 are connected. Further, the second coil 12 and the fifth coil 15 are connected in series to form a second coil pair 22. More specifically, the second end 19 of the second coil 12 and the second end 19 of the fifth coil 15 are connected. Further, the third coil 13 and the sixth coil 16 are connected in series to form a third coil pair 23. More specifically, the first end 18 of the third coil 13 and the first end 18 of the sixth coil 16 are connected.

The second coil pair 22 and the third coil pair 23 are connected in parallel. Further, the second coil pair 22 and the third coil pair 23, which are connected in parallel, are connected in series with the first coil pair 21. In the example shown in FIG. 9, the first end 18 of the second coil 12 and the second end 19 of the third coil 13 are connected. Further, the first end 18 of the fifth coil 15 and the second end 19 of the sixth coil 16 are connected. Further, the first end 18 of the fourth coil 14 is connected to a connection point between the second coil 12 and the third coil 13. The first end 18 of the first coil 11 and the connection points of the fifth coil 15 and the sixth coil 16 are each connected to a power supply circuit 31. In other words, current is supplied to the first to sixth coils 11 to 16 through the common power supply circuit 31.

When the coil unit 5 is configured in this way, if the value of the current flowing through the first coil 11 is I1, the value I4 of the current flowing through the fourth coil 14 is −I1. Further, the value I2 of the current flowing through the second coil 12 and the value I6 of the current flowing through the sixth coil 16 are both I/2. Further, the value I3 of the current flowing through the third coil 13 and the value I5 of the current flowing through the fifth coil 15 are both −I/2. That is, I1:I2:I3:I4:I5:I6=1:0.5:-0.5:-0.1:-0.5:0.5. Here, the value of the current flowing from the first end 18 to the second end 19 is expressed as a positive value, and the value of the current flowing from the second end 19 to the first end 18 is expressed as a negative value. ing.

Next, a method of magnetizing the magnet material unit 6 using the magnetizing device 1 according to the third embodiment will be described.

First, a coil unit forming step is performed. Specifically, the coils 11 to 16 are arranged along the first direction D1. At this time, the coils 11 to 16 are arranged so that the axial directions of the coils 11 to 16 are along the first direction D1. Further, the first coil pair 21 is produced by connecting the first coil 11 and the fourth coil 14 in series. Further, the second coil 12 and the fifth coil 15 are connected in series to produce a second coil pair 22. Further, the third coil 13 and the sixth coil 16 are connected in series to produce a third coil pair 23. Further, the second coil pair 22 and the third coil pair 23 are connected in parallel. A second coil pair 22 and a third coil pair 23 connected in parallel are connected in series with the first coil pair 11.

In addition, a power supply circuit connection process is performed. Specifically, the power supply circuit 31 is connected to the first end 18 of the first coil 11 and the connection point between the fifth coil 15 and the sixth coil 16.

Further, a magnet material unit forming step is performed. Specifically, a plurality of non-magnetized magnet members 51, 52, 53, and 54 are arranged along the second direction D2 and fixed to each other.

Next, a magnet material unit arrangement step is performed. Specifically, the magnet material unit 6 is placed facing the coil unit 5 of the magnetizing device 1. At this time, as shown in FIG. 10, the magnet material unit 6 is arranged so that the second direction D2 of the magnet material unit 6 is along the first direction D1. Moreover, the magnet material unit 6 is arranged so that the first surface 50i of the unit magnet material unit 50 faces the outer circumferential surface 5a or the inner circumferential surface 5b of the coil unit 5. Moreover, as shown in FIG. 10, the center position of each magnet material 51, 52, 53, 54 in the second direction D2 is the position where the reference value R(x) takes the maximum value, minimum value, or zero, and The magnet material units 6 are arranged so as to coincide in one direction D1. In the example shown in FIG. 10, the positions of one end 50a and the other end 50b of the unit magnet material unit 50 are the first from the positions of the one end 10a and the other end 10b of the unit coil unit 10. The magnet material units 6 are arranged so as to be separated by L/24 in the direction D1.

Next, an excitation process is performed. Specifically, the capacitor 43 of the power supply circuit 31 is charged. After charging the capacitor 43 and arranging the magnet material unit 6 at an appropriate position relative to the coil unit 5, the switch 44 of the power supply circuit 31 is closed and the coils 11 to 16 are energized. As a result, the magnet materials 51 to 54 of the magnet material unit 6 are magnetized.

In FIG. 10, the magnetization direction of each magnet material 51 to 54 is indicated by a broken arrow. As shown in FIG. 10, the first magnet material 51 and the third magnet material 53 are magnetized so that the magnetization direction is along the second direction D2. The magnetization direction of the first magnet material 51 and the magnetization direction of the third magnet material 53 differ by 180 degrees. Further, the second magnet material 52 and the fourth magnet material 54 are magnetized so that the magnetization direction is along the fourth direction D4. The magnetization direction of the second magnet material 52 and the magnetization direction of the fourth magnet material 54 differ by 180 degrees.

FIG. 11 shows the magnetized state of a magnet unit produced by magnetizing the magnet material unit 6 using the magnetizing device 1 and magnetizing method according to the third embodiment, and the arrangement of the magnets after magnetization according to the Halbach arrangement. It is a graph which shows the result of analyzing the magnetization state of the conventional magnet unit produced by. More specifically, FIG. 11 shows the distribution of the fourth direction component By _D4 of the magnetic flux density at a position a/2 apart from the first surface 50i. Here, a is the dimension of the magnet material unit 6 in the fourth direction D4. In FIG. 11, the magnetized state of the magnet material unit 6 magnetized by the magnetizing device 1 and magnetizing method according to the third embodiment is shown by a solid line. Moreover, in FIG. 11, the magnetized state of the conventional magnet unit is shown by a broken line. As shown in FIG. 11, the distribution of magnetic flux density of the magnet unit produced by the method of the third embodiment in the fourth direction D4 has a sinusoidal shape with less distortion, similar to the magnet unit produced by the conventional method. It shows. Further, the magnitude of the magnetic flux density of the magnet unit produced by the method of the third embodiment is equivalent to that of the magnet material unit produced by the conventional method.

As described above, according to the third embodiment, since the unmagnetized magnet materials 51 to 54 are arranged and magnetized after being fixed to each other, the magnet materials 51 to 54 are magnetized and then resist the magnetic force. There is no need to arrange them. Further, the magnet material unit 6 including a plurality of magnet materials 51 to 54 can be magnetized in one magnetization operation. Moreover, a complicated jig or device for magnetizing the magnet material unit 6 is not required.

<Modified example>
Note that various further changes can be made to the embodiments described above.

For example, as shown in FIG. 12, the coil unit 5 may include a plurality of unit coil units 10 lined up along the first direction D1. In this case, the magnet material unit 6 may include a plurality of unit magnet material units 50 lined up along the second direction D2.

Further, as shown in FIGS. 13 and 14, a plurality of magnet material units 6 may be magnetized by one coil unit 5. In this case, as shown in FIG. 13, the plurality of magnet material units 6 may be arranged at different positions in the circumferential direction of the coil unit 5. Alternatively, as shown in FIG. 14, the plurality of magnet material units 6 may be arranged outside and inside the coil unit 5.

Further, in the illustrated example, the first direction D1 and the second direction D2 are directions along a straight line, but are not limited to this. For example, the first direction D1 and the second direction D2 may be directions along the circumferential direction of a circle. In this case, an arcuate or cylindrical magnet unit can be manufactured.

The magnetizing device 1 or the magnetizing method according to the embodiments and modifications described above can be applied to manufacturing magnet units arranged according to the Halbach array used in various devices. For example, it is applicable to the production of magnet units used in elevators, railways, linear motors, rotary motors, generators, and electron accelerators.

Although several embodiments and modifications of the present invention have been described, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These novel embodiments and modifications can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents. Furthermore, it goes without saying that these embodiments and modifications can be partially combined as appropriate within the scope of the gist of the present invention.

1: Magnetizing device, 5: Coil unit, 6: Magnet material unit, 10: Unit coil unit, 11: 1st coil, 12: 2nd coil, 13: 3rd coil, 14: 4th coil, 15: 1st coil 5 coils, 16: 6th coil, 21: 1st coil pair, 22: 2nd coil pair, 23: 3rd coil pair, 31: 1st power supply circuit, 32: 2nd power supply circuit, 33: 3rd power supply circuit , 50: Unit magnet material unit, 51: First magnet material, 52: Second magnet material, 53: Third magnet material, 54: Fourth magnet material, D1: First direction, D2: Second direction, D3: 3rd direction, D4: 4th direction

Claims (9)

A magnetizing device that magnetizes a magnet material unit including a unit magnet material unit made of four magnet materials according to a Halbach array,
a coil unit including a unit coil unit made up of a number of coils that are a multiple of 3 and are wound around an axis along a first direction;
at least one power supply circuit connected to the coil unit;
Equipped with
The coils of the unit coil unit are arranged in the first direction,
The lengths of the coils of the unit coil unit are equal to each other,
When viewed in the first direction, the winding direction of the coils of the unit coil unit whose number is the same as the largest integer less than or equal to the value obtained by dividing the number of coils of the unit coil unit by 2 is the same as that of the other unit coil units. A magnetizing device that is in the opposite direction to the coil winding direction. each coil has a first end and a second end;
The winding directions of the coils are in the same direction when viewed from the first end toward the second end,
When the value of the current flowing from the first end to the second end is represented by a positive value, and the value of the current flowing from the second end to the first end is represented by a negative value, the power supply circuit The value of the current flowing through each coil through the coil is the value of the reference value R(x) expressed by any of the following formulas (1) to (4) at the center position of the coil in the axial direction. 1. The magnetizing device according to 1.
R(x)=αsin (2π(x-L/8)/L)...(1)
R(x)=αsin (2π(x-3L/8)/L)...(2)
R(x)=αsin (2π(x-5L/8)/L)...(3)
R(x)=αsin (2π(x-7L/8)/L)...(4)
Here, α is an arbitrary constant, L is the total length of the unit coil unit, and x is the distance along the first direction between one end of the unit coil unit and the center position of the coil in the axial direction. This is the distance. The unit coil unit includes a first coil, a second coil, a third coil, a fourth coil, a fifth coil, and a sixth coil,
The first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil are arranged in this order along the first direction,
When viewed in the first direction, the winding directions of the first coil, the second coil, and the sixth coil are opposite to the winding directions of the third coil, the fourth coil, and the fifth coil. can be,
The first coil and the fourth coil are connected in series to form a first coil pair,
the second coil and the fifth coil are connected in series to form a second coil pair;
The third coil and the sixth coil are connected in series to form a third coil pair,
The second coil pair and the third coil pair are connected in parallel,
The second coil pair and the third coil pair connected in parallel are connected in series with the first coil pair,
The magnetizing device according to claim 2, wherein the unit coil unit is connected to a single power supply circuit. The magnetizing device according to claim 1, wherein the coil unit has a plurality of unit coil units arranged along the first direction. A magnetizing method for magnetizing a magnet material unit including a unit magnet material unit made of four magnet materials according to a Halbach array, the method comprising:
A coil unit including a unit coil unit made up of coils whose number is a multiple of 3 wound around an axis line along a first direction, the coil unit forming a coil unit in which the coils are arranged in the first direction. Coil unit forming process,
a power circuit connecting step of connecting at least one power circuit to the coil unit;
a magnet material unit forming step of arranging the magnet materials along a second direction to form a magnet material unit;
a magnet material unit arranging step of arranging the magnet material unit to face an inner circumferential surface or an outer circumferential surface of the coil unit so that the second direction is along the first direction;
After the magnet material unit arrangement step, an excitation step of causing current to flow through each coil through the power supply circuit to excite each coil;
Equipped with
The lengths of the coils of the unit coil unit along the first direction are equal to each other,
The lengths of the magnetic materials of the magnetic material units along the second direction are equal to each other,
The length of the unit coil unit along the first direction is equal to the length of the unit magnet material unit along the second direction,
When viewed in the first direction, the winding direction of the coils of the unit coil unit whose number is the same as the largest integer less than or equal to the value obtained by dividing the number of coils of the unit coil unit by 2 is the same as that of the other unit coil units. A method of magnetization that is opposite to the winding direction of the coil. each coil has a first end and a second end;
The winding directions of the coils are in the same direction when viewed from the first end toward the second end,
When the value of the current flowing from the first end to the second end is represented by a positive value, and the value of the current flowing from the second end to the first end is represented by a negative value, the excitation step The value of the current flowing through each coil through the power supply circuit is the value of the reference value R(x) expressed by any of the following formulas (1) to (4) at the center position of the coil in the axial direction. can be,
In the magnet material unit arrangement step, in the magnet material unit, the center position of each magnet material in the second direction is at a position where the reference value R(x) takes a maximum value, a minimum value, or zero, and the first The magnetizing method according to claim 5, wherein the coil unit is arranged facing the inner circumferential surface or the outer circumferential surface of the coil unit so as to coincide in direction.
R(x)=αsin (2π(x-L/8)/L)...(1)
R(x)=αsin (2π(x-3L/8)/L)...(2)
R(x)=αsin (2π(x-5L/8)/L)...(3)
R(x)=αsin (2π(x-7L/8)/L)...(4)
Here, α is an arbitrary constant, L is the total length of the unit coil unit, and x is the distance along the first direction between one end of the unit coil unit and the center position of the coil in the axial direction. This is the distance. The unit magnet material unit includes a first magnet material, a second magnet material, a third magnet material, and a fourth magnet material,
The first magnet material, the second magnet material, the third magnet material, and the fourth magnet material are arranged in this order along the second direction,
The unit coil unit includes a first coil, a second coil, a third coil, a fourth coil, a fifth coil, and a sixth coil,
When viewed in the first direction, the winding directions of the first coil, the second coil, and the sixth coil are opposite to the winding directions of the third coil, the fourth coil, and the fifth coil. can be,
The first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil are arranged in this order along the first direction,
The first coil and the fourth coil are connected in series to form a first coil pair,
the second coil and the fifth coil are connected in series to form a second coil pair;
The third coil and the sixth coil are connected in series to form a third coil pair,
The second coil pair and the third coil pair are connected in parallel,
The second coil pair and the third coil pair connected in parallel are connected in series with the first coil pair,
7. The magnetization method according to claim 6, wherein the unit coil unit is connected to a single power supply circuit. The coil unit includes a plurality of unit coil units arranged along the first direction,
The magnetizing method according to claim 5, wherein the magnet material unit includes a plurality of unit magnet material units arranged along the first direction. The magnetizing method according to claim 5, wherein in the magnet material unit arrangement step, a plurality of the magnet material units are arranged to face the inner circumferential surface and/or the outer circumferential surface of the coil unit.

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