JP7073711B2 - Permanent magnet pieces, permanent magnet assemblies and permanent magnet application equipment - Google Patents

Description

The present invention relates to permanent magnet pieces, permanent magnet assemblies and permanent magnet application devices.

Particularly in recent years, large magnets assembled from a plurality of magnets have been used not only for motors but also for linear motor cars, for example, with the progress and development of transportation technology. In addition, large magnets are used for MRI with the development of medical technology, and are used for wind power generators and the like with the utilization of renewable energy.

As a large magnet used in such an apparatus, there is known a case where a magnetizing device as shown in Patent Document 1 is used to magnetize an assembled magnet that has been previously fixed with an adhesive and integrated. Further, there is known an example in which an assembled magnet is manufactured by using a pre-magnetized magnet piece as an assembly jig as shown in Patent Document 2. Further, as in Patent Document 3, there is known a case where an assembled magnet is manufactured by forming a groove in a yoke and embedding a permanent magnet in the groove.

However, in the case of an assembled magnet in which a plurality of permanent magnet pieces are fixed with an adhesive and integrated, a repulsive force is generated between adjacent permanent magnet pieces after magnetization, and various measures are taken. However, it is disadvantageous in terms of mechanical strength. In particular, there is a problem that it is difficult to use it when a harsh usage environment is expected or when the strength condition is strict.

Further, in the method shown in Patent Document 2, a repulsive force is generated between the permanent magnet pieces even at the time of bonding, the stress state inside the adhesive is not good, and it is difficult to secure the mechanical strength. There was a problem.

Further, in any of Patent Documents 1 to 3, there is a problem that the uniformity of the magnetic field as an assembled magnet deteriorates at the joint portion between the adjacent permanent magnet pieces, and magnetic flux unevenness occurs.

In order to solve these problems, the present inventor proposes a permanent magnet piece and an assembly thereof shown in Patent Document 4. However, when assembling the permanent magnet pieces shown in Patent Document 4 so as to connect the same magnetic poles, it is difficult to connect the other permanent magnet pieces without adhering the magnetic pole surfaces of one permanent magnet piece to the base material. It turned out to be. That is, when two permanent magnet pieces are connected as shown in FIG. 13A, the magnetic pole surface of one permanent magnet piece moves along the inclined surface of the other permanent magnet piece as shown in FIG. 13B. Finally, as shown in FIG. 13C, it was found that the magnetic pole surfaces having opposite polarities may be attracted to each other, making it difficult to connect the inclined surfaces to each other.

Japanese Unexamined Patent Publication No. 10-326710 Japanese Unexamined Patent Publication No. 2012-74579 Japanese Unexamined Patent Publication No. 5-284721 WO2015-147304A

The present invention has been made in view of such an actual situation, and the first object thereof is that when two or more permanent magnet pieces are bonded or assembled, the magnetic pole surface of one permanent magnet piece is the other permanent magnet piece. It is an object of the present invention to provide a permanent magnet assembly for suppressing the possibility of moving along an inclined surface and being attracted to magnetic pole surfaces having opposite polarities and making it difficult to connect the inclined surfaces to each other. Further, in order to bond or assemble two or more permanent magnet pieces, a permanent magnet piece and a permanent magnet assembly suitable for suppressing the repulsive force between the permanent magnet pieces and easily assembling a large magnet are provided. That is.

A second object of the present invention is to move the magnetic pole surface of one permanent magnet piece along the inclined surface of the other permanent magnet piece in order to bond or assemble two or more permanent magnet pieces, and vice versa. It is an object of the present invention to provide a permanent magnet piece for suppressing being attracted to a magnetic pole surface having a polarity and making it difficult to connect the inclined surfaces to each other.

A third object of the present invention is to provide a permanent magnet piece for fitting permanent magnet pieces together, which is suitable for easily adhering or assembling two or more permanent magnet pieces.

A fourth object of the present invention is to suppress the repulsive force between the permanent magnet pieces in order to bond or assemble two or more permanent magnet pieces, and the magnetic pole surface of one permanent magnet piece is the other permanent magnet piece. It is an object of the present invention to provide a permanent magnet assembly suitable for assembling a large magnet more easily by moving along an inclined surface of the magnet and not being attracted to a magnetic pole surface having the opposite polarity.

A fifth object of the present invention is a permanent magnet assembly suitable for easily assembling a large magnet by suppressing the repulsive force between the permanent magnet pieces in order to bond or assemble two or more permanent magnet pieces. It is to provide a permanent magnet application device provided with.

In order to achieve the first object, the permanent magnet assembly according to the first aspect of the present invention is
A permanent magnet assembly having a first permanent magnet piece and a second permanent magnet piece connected to the first permanent magnet piece.
The first permanent magnet piece is
It has a first surface, a second surface facing the first surface, and at least one first combination surface formed so as to connect the first surface and the second surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the first surface and / or the second surface.
The first combination surface has at least a first inclined surface and a second inclined surface constituting different planes.
The second permanent magnet piece is
It has a third surface, a fourth surface facing the third surface, and at least one second combination surface formed to connect the third surface and the fourth surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the third surface and / or the fourth surface.
The second combination surface has at least a third inclined surface and a fourth inclined surface constituting different planes.
The first inclined surface and the third inclined surface are substantially parallel so that the first combined surface and the second combined surface are combined and connected, and the second inclined surface and the fourth inclined surface are substantially parallel to each other. It is characterized in that it is substantially parallel to the surface.

In the permanent magnet assembly according to the first aspect of the present invention, a first combination surface having at least a first inclined surface and a second inclined surface constituting different planes, and at least a third inclined surface and a fourth inclined surface forming different planes. The second combination surface having an inclined surface is formed substantially in parallel. As a result, different planes are fitted to each other, so that when the first permanent magnet piece and the second permanent magnet piece are connected to each other, the magnetic poles on the first surface of the adjacent first permanent magnet pieces are used. When the magnetic poles on the third surface of the second permanent magnet piece are the same, that is, the magnetic poles on the second surface of the first permanent magnet piece and the magnetic poles on the third surface of the second permanent magnet piece are different, so that the attractive force is increased. Even if the first permanent magnet piece tries to move along the first combination surface by working, the movement is blocked by the second combination surface. As a result, the first magnetic pole surface of the first permanent magnet piece is not attracted to the second magnetic pole surface having the opposite polarity to the first magnetic pole surface of the second permanent magnet piece. Further, since it is not necessary to adhere to the base material, it is possible to construct a permanent magnet assembly with only a permanent magnet piece.

The first inclined surface forms an acute angle with the first surface, the second inclined surface forms an acute angle with the second surface, and the third inclined surface forms an obtuse angle with the third surface. The four inclined surfaces may have an obtuse angle with the fourth surface. With this configuration, when the first combination surface and the second combination surface are combined, the first surface and the third surface having the same polarity can be connected by a smooth plane or curved surface, and are the same. It becomes easy to form a magnet with a large area of polarity.

The first permanent magnet piece is
A third magnet piece having at least the first surface, a first joining surface facing the first surface, and the first inclined surface.
It has a fourth magnet piece having the second surface, a second joining surface facing the second surface, and the second inclined surface.
The first joint surface and the second joint surface may be arranged so as to face each other.

With this configuration, by joining the third magnet piece and the fourth magnet piece at the joint surface of both, the concave first combination surface composed of the first inclined surface and the second inclined surface can be easily formed. Can be formed into.

The distance between the first surface and the first joint surface and the distance between the second surface and the second joint surface may be substantially the same thickness, but may be different from each other. When the distance between the first surface and the first joint surface and the distance between the second surface and the second joint surface are substantially the same thickness, the first inclined surface and the second inclined surface having a symmetrical shape are formed. A concave first combination surface composed of a surface can be easily formed.

The angle between the first surface and the first inclined surface and the angle between the second surface and the second inclined surface may be substantially the same, but may be different. When the angle between the first surface and the first inclined surface and the angle between the second surface and the second inclined surface are substantially the same, the first inclined surface and the second inclined surface having a symmetrical shape are formed. The concave first combination surface can be easily formed.

The shape of the third magnet piece and the shape of the fourth magnet piece may be substantially the same, but may be different. When the shape of the third magnet piece and the shape of the fourth magnet piece are substantially the same, any two magnet pieces processed into the same shape can be used as the third magnet piece and the fourth magnet. Since it can be treated as a piece, a concave first combination surface composed of a symmetrical first inclined surface and a second inclined surface can be efficiently formed.

The second permanent magnet piece is
A fifth magnet piece having at least the third surface, a third joint surface facing the third surface, and the third inclined surface.
It has a sixth magnet piece having the fourth surface, the fourth joint surface facing the fourth surface, and the fourth inclined surface.
The third joint surface and the fourth joint surface may be arranged so as to face each other.

With this configuration, by joining the 5th magnet piece and the 6th magnet piece at the joint surface of both, a convex second combination surface composed of a 3rd inclined surface and a 4th inclined surface can be formed. It can be easily formed.

The distance between the third surface and the third joint surface and the distance between the fourth surface and the fourth joint surface may be substantially the same thickness, but may be different from each other. When the distance between the third surface and the third joint surface and the distance between the fourth surface and the fourth joint surface are substantially the same thickness, the third inclined surface and the fourth inclined surface having a symmetrical shape are formed. A convex second combination surface composed of a surface can be easily formed.

The angle between the third surface and the third inclined surface and the angle between the fourth surface and the fourth inclined surface may be substantially the same, but may be different. When the angle between the third surface and the third inclined surface and the angle between the fourth surface and the fourth inclined surface are substantially the same, the third inclined surface and the fourth inclined surface having a symmetrical shape are formed. The convex second combination surface can be easily formed.

The shape of the fifth magnet piece and the shape of the sixth magnet piece may be substantially the same, but may be different. When the shape of the 5th magnet piece and the shape of the 6th magnet piece are substantially the same, any two magnet pieces processed into the same shape can be used as the 3rd magnet piece and the 4th magnet. Since it can be treated as a piece, a convex second combination surface composed of a symmetrical third inclined surface and a fourth inclined surface can be efficiently formed.

Preferably, the sum of the obtuse angle and the acute angle is approximately 180 degrees. With this configuration, the first surface and the third surface having the same polarity can be connected in substantially the same plane.

Preferably, the acute angle is 50 degrees or less, preferably 30 degrees or less, and more preferably 17 degrees or less. By setting such an angle, it is possible to reduce the repulsive force generated between the first permanent magnet piece and the second permanent magnet piece when the first permanent magnet piece and the second permanent magnet piece are combined on the first combination surface and the second combination surface. , It becomes easy to assemble a large area magnet of the same polarity.

Preferably, the obtuse angle is 130 degrees or more, preferably 150 degrees or more, and more preferably 163 degrees or more. By setting such an angle, it is possible to reduce the repulsive force generated between the first permanent magnet piece and the second permanent magnet piece when the first permanent magnet piece and the second permanent magnet piece are combined on the first combination surface and the second combination surface. , It becomes easy to assemble a large area magnet of the same polarity.

The first permanent magnet piece according to the second aspect of the present invention is
A permanent magnet piece having a first surface, a second surface facing the first surface, and at least one combination surface formed so as to connect the first surface and the second surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the first surface and / or the second surface.
The combination surface is
It is characterized by having at least a first inclined surface forming an acute angle with the first surface and a second inclined surface forming an acute angle with the second surface.

The second permanent magnet piece according to the second aspect of the present invention is
A permanent magnet piece having a third surface, a fourth surface facing the third surface, and at least one combination surface formed so as to connect the third surface and the fourth surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the third surface and / or the fourth surface.
The combined surface is characterized by having at least a third inclined surface having an obtuse angle with the third surface and a fourth inclined surface forming an obtuse angle with the fourth surface.

The first permanent magnet piece according to the second aspect of the present invention has at least a first inclined surface and a first combined surface having a second inclined surface constituting different planes. Further, in the second permanent magnet piece according to the second aspect of the present invention, at least a second combination surface having at least a third inclined surface and a fourth inclined surface constituting different planes is formed substantially in parallel.

When connecting the first permanent magnet piece and the second permanent magnet piece, the magnetic poles on the first surface of the adjacent first permanent magnet piece and the magnetic poles on the third surface of the second permanent magnet piece are the same. However, the first magnetic pole surface of the first permanent magnet piece is not attracted to the second magnetic pole surface having the opposite polarity to the first magnetic pole surface of the second permanent magnet piece. Further, since it is not necessary to adhere to the base material, it is possible to construct a permanent magnet assembly with only a permanent magnet piece.

The first permanent magnet piece according to the third aspect of the present invention is a permanent magnet piece having a concave first combination surface, and the base angle of the concave first combination surface is 100 degrees or less, preferably 60 degrees. Below, it is more preferably 34 degrees or less.

The second permanent magnet piece according to the third aspect of the present invention is a permanent magnet piece having a convex second combination surface, and the apex angle of the convex second combination surface is 100 degrees or less, preferably 100 degrees or less. It is 60 degrees or less, more preferably 34 degrees or less.

The permanent magnet assembly according to the third aspect of the present invention is
A permanent magnet assembly having a first permanent magnet piece having a concave first combination surface and a second permanent magnet piece having a convex second combination surface connected to the concave first combination surface. hand,
The apex angle of the convex second combination surface is 100 degrees or less, preferably 60 degrees or less, and more preferably 34 degrees or less.

In the permanent magnet piece and the permanent magnet assembly according to the third aspect of the present invention, the concave first combination surface and the convex second combination surface are fitted to be combined with each other. Since the angle of the combined surfaces is set within a predetermined range, the repulsive force of the magnetic force generated on these combined surfaces can be reduced. By combining a plurality of permanent magnet pieces using such a combination surface, it is possible to realize a permanent magnet assembly having a relatively large area and a magnetic pole surface having the same polarity.

In order to achieve the above-mentioned fourth object, the permanent magnet assembly according to the fourth aspect of the present invention is
It also has a base material made of magnetic material,
The base material has a first permanent magnet piece and an installation surface on which the second permanent magnet piece is placed.
So that the magnetic poles on the first surface of the first permanent magnet piece and the magnetic poles on the third surface of the second permanent magnet piece are the same.
The second surface of the first permanent magnet piece and the fourth surface of the second permanent magnet piece are attracted to the installation surface and at the same time.
The first inclined surface and the third inclined surface are substantially parallel so that the first combined surface and the second combined surface are combined and connected, and the second inclined surface and the fourth inclined surface are substantially parallel to each other. It is characterized in that it is substantially parallel to the surface.

In the permanent magnet assembly according to the fourth aspect of the present invention, a first combination surface having at least a first inclined surface and a second inclined surface constituting different planes, and at least a third inclined surface and a fourth inclined surface forming different planes. The second combination surface having an inclined surface is formed substantially in parallel. As a result, different planes are fitted to each other, so that when the first permanent magnet piece and the second permanent magnet piece are connected to each other, the magnetic poles on the first surface of the adjacent first permanent magnet pieces are used. Even if the magnetic poles on the third surface of the second permanent magnet piece are the same, the first magnetic pole surface of the first permanent magnet piece has a polarity opposite to that of the first magnetic pole surface of the second permanent magnet piece. It is not attracted to the second magnetic pole surface. Further, since the base material made of a magnetic material is further provided, the angle range of the combined surface that reduces the repulsive force of the magnetic force can be widened.

From the prior art, it is conceivable to magnetize a magnet assembly to which a plurality of permanent magnet pieces are bonded in advance, but in that case, a large magnetizer is required. On the other hand, in the permanent magnet piece according to the present invention, since the magnetized permanent magnet pieces can be combined to form an aggregate magnet assembly, the permanent magnet assembly can be performed without using a large magnetizer. It is possible to increase the size of the three-dimensional structure.

The permanent magnet piece of the present invention can be obtained by molding a sintered magnet such as an isotropic ferrite sintered magnet, an anisotropic ferrite sintered magnet, or an anisotropic rare earth sintered magnet into a predetermined shape, or by combining after molding. It can be obtained by processing the surface.

The permanent magnet piece of the present invention includes isotropic ferrite bond magnets, anisotropic ferrite bond magnets, isotropic rare earth bond magnets, anisotropic rare earth bond magnets, etc., which are formed by kneading magnet powder with resin. It can be obtained with a bonded magnet having a combined surface formed by injection molding.

Preferably, the permanent magnet pieces are obtained by sintering a molded body obtained by CIM molding or MIM molding.

In the permanent magnet piece of the present invention, a molded body having a combined surface having a sharp apex angle or a bottom angle can be easily molded by injection molding by a CIM (ceramic injection molding) method, so that the number of parts can be increased. In addition, the processing cost can be significantly reduced, the manufacturing process can be simplified, and the yield and magnetic characteristics can be improved, so that economic efficiency and productivity can be improved. .. Further, also on the combination surface, it is possible to obtain a highly anisotropic ferrite sintered magnet having a magnet orientation degree of 90% or more.

Further, in the permanent magnet piece of the present invention, a molded body having a combined surface having a sharp apex angle can be easily molded by injection molding by the MIM (metal injection molding) method, so that the number of parts is not increased. Moreover, the processing cost can be significantly reduced, the manufacturing process can be simplified, and the yield and magnetic characteristics can be improved, so that the economy and productivity can be improved. Further, also on the combined surface, it is possible to obtain a highly anisotropic rare earth sintered magnet having a magnet orientation degree of 90% or more.

The substrate of the present invention can be obtained from silicon steel sheet, structural carbon steel such as S45C, general structural rolled steel such as SS400, rolled steel sheet such as SPCC, magnetic stainless steel such as SUS430, and the like.

In order to achieve the fifth object, the permanent magnet piece and the permanent magnet assembly according to the fifth aspect of the present invention are, for example, a magnetic field generator for MRI, a magnetic field generator of a plasma device, a magnetic circuit of a rotating machine, and a linear. It is used in permanent magnet application devices such as motors and linear transportation systems, and can be applied to a wide range of fields. Further, the permanent magnet pieces and the permanent magnet assemblies according to the above-mentioned viewpoints of the present invention can be used in combination rather than individually.

By using the permanent magnet assembly according to the present invention, it becomes easy to manufacture the above-mentioned large-sized permanent magnet application device.

FIG. 1A is a perspective view of a permanent magnet assembly according to an embodiment of the present invention. FIG. 1B is a partial schematic view showing the magnetic force of the permanent magnet assembly shown in FIG. 1A. FIG. 1C is a partial schematic view showing the magnetic force of the permanent magnet assembly according to the conventional example. FIG. 1D is a graph showing the relationship between a predetermined angle of a combination surface and a force acting between magnet pieces in the permanent magnet assembly according to the embodiment of the present invention. FIG. 1E is a graph in which the relationship between a predetermined angle of a combination surface and a force acting between magnet pieces in the permanent magnet assembly according to the embodiment of the present invention is converted into a comparison with a conventional example. FIG. 1F shows a comparison between a predetermined angle of a combination surface and a force acting between magnet pieces in a permanent magnet assembly (with a base material) according to another embodiment of the present invention, as compared with a conventional example. It is a converted graph. FIG. 2A is a side view of a permanent magnet assembly according to another embodiment of the present invention. FIG. 2B is a side view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 2C is a side view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 2D is a side view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 2E is a side view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 3 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 4 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 5 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 6 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 7 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 8 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 9 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 10 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 11 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 12 is a schematic perspective view of a permanent magnet assembly according to still another embodiment of the present invention. FIG. 13A is a side view of a permanent magnet assembly in a state where two permanent magnet pieces are connected according to a conventional example. FIG. 13B is a side view of a permanent magnet assembly according to a conventional example in a state where the magnetic pole surface of one permanent magnet piece is moved along an inclined surface of the other permanent magnet piece. FIG. 13C is a side view of a permanent magnet assembly according to a conventional example in a state where the magnetic pole surface of one permanent magnet piece is attracted to the magnetic pole surface having the opposite polarity of the other.

Hereinafter, the present invention will be described based on the embodiments shown in the drawings. The common elements are designated by a common reference numeral, and duplicate explanations will be omitted. Further, the positional relationship such as up / down / left / right is relative and is not particularly limited, and the up / down / left / right may be reversed. Furthermore, the dimensional ratios in the drawings are not limited to the ratios shown. Further, the following embodiments are examples for explaining the present invention, and the present invention is not limited to the embodiments thereof.

(First Embodiment)
FIG. 1A is a perspective view schematically showing the configuration of a preferred embodiment of the permanent magnet assembly according to the present invention. As shown in FIG. 1A, the permanent magnet assembly 1 according to the present embodiment has at least a first permanent magnet piece 10 and a second permanent magnet piece 20. The first permanent magnet piece 10 has a first surface 12 which is a functional surface and a second surface 14 which faces the first surface 12 substantially in parallel and serves as an installation surface.

In the present embodiment, the installation surface which is the second surface 14 is a surface to be installed on some member, for example, the base material 30, but it does not necessarily have to be installed on the member, and is the first surface 12. The functional surface means a surface (magnetic pole surface) that generates a necessary magnetic force for the entire device. Further, in the drawings, the X-axis is the direction in which the first permanent magnet 10 and the second permanent magnet 20 face each other, the Y-axis is the width direction of these magnets 10 and 20, and the Z-axis is these magnets. 10 and 20 thickness directions.

On the side surface of the first permanent magnet piece 10 in the X-axis direction, a concave first combination surface 16 is formed so as to connect the first surface 12 and the second surface 14. In the present embodiment, the other side surface 18 of the first permanent magnet piece 10 is configured with a cross section substantially perpendicular to the first surface 12 and the second surface 14.

The first combination surface 16 has at least a first inclined surface 16a and a second inclined surface 16b constituting different planes. An upper tip corner portion 15a is formed at the intersection of the first inclined surface 16a and the first surface 12, and the angle θ11 of the corner portion 15a is 50 degrees or less, preferably 30 degrees or less, more preferably 30 degrees or less. It has an acute angle of 17 degrees or less. The lower limit of the angle θ11 is not particularly limited, but is preferably 5.7 degrees or more.

Further, a lower tip corner portion 15b is formed at the intersection of the second inclined surface 16b and the second surface 14, and the angle θ12 of the corner portion 15b is within the same angle range as the upper tip corner portion 15a. Determined, but not necessarily identical. The bottom angle θ10 of the concave bottom portion 17 of the first combination surface 16 having a concave cross section formed by the upper tip corner portion 15a and the lower tip corner portion 15b is 100 degrees or less, preferably 60 degrees or less, more preferably 34 degrees or less. The acute angle of. The lower limit of the bottom angle θ10 is not particularly limited, but is 11.4 degrees or more. The bottom angle θ10 is an upper tip angle θ11 and a lower tip angle θ12 when the first surface 12 and the second surface 14 are parallel planes and the first inclined surface 16a and the second inclined surface 16b are flat surfaces. Is approximately equal to the sum of.

The first surface 12 and the second surface 14 do not necessarily have to be a flat surface, and may be a convex curved surface or a concave curved surface. Further, the first inclined surface 16a and the second inclined surface 16b do not necessarily have to be flat, and may be a convex curved surface or a concave curved surface. Further, in the present embodiment, the angle θ11 and the angle θ12 are equal, and the thickness Z1 from the first surface 12 to the concave bottom portion 17 and the thickness Z2 from the second surface 14 to the concave bottom portion 17 are substantially the same, but different. You may.

On the side surface of the second permanent magnet piece 20 in the X-axis direction, the side surface of the first permanent magnet piece 10 facing the first combination surface 16 is convex so as to connect the third surface 22 and the fourth surface 24. The second combination surface 26 is formed. In this embodiment, the other side surface 28 of the second permanent magnet piece 20 has a cross section substantially perpendicular to the third surface 22 and the fourth surface 24.

The second combined surface 26 has at least a third inclined surface 26a and a fourth inclined surface 26b constituting different planes. An upper base end angle portion 25a is formed at the intersection of the third inclined surface 26a and the third surface 22, and the angle θ21 of the corner portion 25a is 130 degrees or more, preferably 150 degrees or more, more preferably 150 degrees or more. Is an obtuse angle of 163 degrees or more. The upper limit of the angle θ21 is not particularly limited, but is preferably 174.3 degrees or less.

Further, a lower base end corner portion 25b is formed at the intersection of the third inclined surface 26b and the fourth surface 24, and the angle θ22 of the corner portion 25b is the same angle range as the upper base end corner portion 25a. It is determined within, but it does not necessarily have to be the same. However, by setting the angle θ21 and the angle θ22 to substantially the same angle, it is possible to easily form a convex second combination surface 26 composed of a symmetrical third inclined surface 26a and a fourth inclined surface 26b. can.

The apex angle θ20 of the convex apex 27 of the second combination surface 26 having a convex cross section in which the upper base end angle portion 25a and the lower base end angle portion 25b are formed may be substantially the same as or slightly smaller than the base angle θ10. Preferably, specifically, the acute angle is 100 degrees or less, preferably 60 degrees or less, and more preferably 34 degrees or less. The lower limit of the apex angle θ20 is not particularly limited, but is 11.4 degrees or more.

This apex angle θ20 is a complementary angle of the upper base end angle θ21 when the third surface 22 and the fourth surface 24 are parallel planes and the third inclined surface 26a and the fourth inclined surface 26b are planes. That is, it is substantially equal to the sum of the angle θ11) and the complementary angle (that is, the angle θ12) of the lower base end angle θ22.

The third surface 22 and the fourth surface 24 do not necessarily have to be a flat surface, and may be a convex curved surface or a concave curved surface. Further, the third inclined surface 26a and the fourth inclined surface 26b do not necessarily have to be a flat surface, and may be a convex curved surface or a concave curved surface. Further, in the present embodiment, the angle θ21 and the angle θ22 are equal to each other.

In the present embodiment, the first permanent magnet piece 10 is magnetized so as to have a magnetic flux substantially perpendicular to the first surface 12 and / or the second surface 14, and the first surface 12 has an N pole. The second permanent magnet piece 20 is magnetized so as to have a magnetic flux substantially perpendicular to the third surface 22 and / or the fourth surface 24, and the third surface 12 has an N pole. The convex second combination surface 26 enters the inside of the concave first combination surface 16 so that the first surface 12 and the third surface 22 are flush with each other, and the first inclined surface 16a and the first surface 22a. The three inclined surfaces 26a are in close contact with each other, and the second inclined surface 16b and the fourth inclined surface 26b are in close contact with each other.

The convex second combination surface 26 and the concave first combination surface 16 are combined only by a magnetic force under a predetermined angle condition. For example, if the angle θ10 is substantially equal to the angle θ20 and these angles θ10 are 34 degrees or less, it is possible to be attracted only by the magnetic force. If the angle θ10 is substantially equal to the angle θ20 and these angles θ10 are 100 degrees or less, the repulsive force can be reduced to 60% or less as compared with the conventional combination of upright surfaces. It can also be easily bonded and fixed by using or the like.

FIG. 1B is a simulation result showing the distribution of magnetic flux lines in the vicinity of the combination of the concave bottom portion 17 of the permanent magnet piece 10 of the permanent magnet assembly 1 shown in FIG. 1A and the convex top portion 27 of the permanent magnet piece 20. As shown in the figure, when the X-axis direction gap Xd between the magnet pieces 10 and 20 is set to 0.1 mm and the apex angle θ20 (= θ10) is 30 degrees, the distribution state of the magnetic poles is changed from the state of the magnetic flux lines. It can be confirmed, and it can be confirmed that an attractive force is generated between these magnetic poles.

According to the present embodiment, the first combination surface 16 having at least the first inclined surface 16a and the second inclined surface 16b constituting different planes, and at least the third inclined surface 26a and the fourth inclined surface 26b constituting different planes. The second combination surface 26 having the above is formed substantially in parallel. As a result, different planes are fitted to each other. Therefore, when connecting the first permanent magnet piece 10 and the second permanent magnet piece 20, the magnetic poles of the first surface 12 of the adjacent first permanent magnet pieces 10 are connected. When the magnetic poles of the third surface 22 of the second permanent magnet piece 20 are the same at the N poles, that is, the magnetic poles of the second surface 14 of the first permanent magnet piece 10 and the third surface 22 of the second permanent magnet piece 20. Even if the first permanent magnet piece 10 tries to move along the first combination surface 16 due to the attraction force acting due to the different magnetic poles, the movement is blocked by the second combination surface 26. As a result, the second surface 14 of the first permanent magnet piece 10 is not attracted to the third surface 22 of the second permanent magnet piece 20. Further, since it is not necessary to adhere to the base material 30 or the like, it is possible to configure the permanent magnet assembly 1 with only the permanent magnet pieces 10 and 20.

According to this embodiment, it becomes easy to combine a plurality of permanent magnet pieces 10 and 20 to assemble a magnet having a single magnetic pole surface having a relatively large area. That is, it is possible to increase the economic efficiency and productivity when assembling a magnet having a single magnetic pole surface (N pole or S pole) having a relatively large area.

As shown in FIG. 1C, in the conventional permanent magnet piece 100a, since the combination surface 106a is substantially perpendicular to the first surface 102a and the second surface 104a, a plurality of magnetic flux surfaces having the same polarity and a large area are provided. When the magnet pieces 100a of the above were tried to be formed, the distribution state of the magnetic poles could be confirmed from the state of the magnetic flux lines between the combination surfaces 106a, and a strong repulsive force was generated between the magnetic poles. Therefore, it is difficult to assemble a magnet having a single magnetic pole surface having a relatively large area by combining a plurality of permanent magnet pieces 100a.

In order to specifically show the action and effect when the first permanent magnet piece 10 and the second permanent magnet piece 20 according to the present embodiment are combined, as shown in FIG. 1D, the angle of the base angle θ10 is set from 180 degrees. The force was changed up to 20 degrees, and the force actually acting between the magnet pieces 10 and 20 shown in FIG. 1A was simulated. The bottom angle θ10 is the same as the apex angle θ20, and is the total angle of the angle θ11 of the corner portion 15a and the angle θ12 of the corner portion 15b.

The first permanent magnet piece 10 and the second permanent magnet piece 20 are molded by a commonly used sintering magnet molding method, and are substantially the first surface 12, the second surface 14, the third surface 22, and the first surface. It is oriented perpendicular to the four surfaces 24. These magnet pieces 10 and 20 are each composed of magnetized anisotropic rare earth sintered magnets.

As shown in FIG. 1A, the permanent magnet pieces 10 and 20 are mutual with the first permanent magnet piece 10 and the second permanent magnet piece 20 having a gap Xd between the combined surfaces 16 and 26 opened by 0.1 mm. The force acting in the X-axis direction was obtained by simulation. Here, the first surface 12 of the first permanent magnet piece 10 is magnetized to the N pole, and the second surface 14 is magnetized to the S pole. Further, the third surface 22 of the second permanent magnet piece 20 is magnetized to the N pole, and the fourth surface 24 is magnetized to the S pole. Further, the length Xa in the X-axis direction of the first permanent magnet piece 10 (the length in the X-axis direction from the side surface 18 in the X-axis direction to the concave bottom portion 17) is 20 mm, and the length in the X-axis direction of the second permanent magnet piece 20. The length Xb (the length in the X-axis direction from the side surface 28 in the X-axis direction to the convex top 27) was 20 mm, and the total length Xc in the X-axis direction was 40 mm. Further, the thickness (height in the Z-axis direction) Z0 of these magnet pieces 10 and 20 was set to 5 mm. Further, the width (length in the Y-axis direction) Y0 of these magnet pieces 10 and 20 was set to 20 mm. Further, the thickness Z1 and the thickness Z2 are both set to 2.5 mm. The result of the simulation is shown in FIG. 1D.

As can be seen from FIG. 1D, as θ10 decreases from 180 degrees, the force acting on the permanent magnet pieces 10 and 20 (repulsive force in the X-axis direction in FIG. 1A) gradually decreases. This is because the suction force is generated between the main parts of the first combination surface 16 and the second combination surface 26, and the second surface 14 and the second surface 14 and the second surface 14 and the third surface 22 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 It shows that the repulsive force acting between the four sides 24 is reduced. The fact that θ10 is 180 degrees is the conventional permanent magnet assembly shown in FIG. 1C.

As shown in FIG. 1D, when θ10 is reduced to 100 degrees or less, the repulsive force becomes 60% or less of the conventional value, preferably when θ10 is 60 degrees or less, more preferably 38 degrees or less, the repulsive force is a negative value, that is, , It can be seen that the repulsive force changes to the adsorptive force.

Further, FIG. 1E shows δ1 even if the dimensions (Xa, Xb, Xc, Z0, Z1, Z2, Z1', Z2' and Y0) and materials of the permanent magnet pieces 10 and 20 shown in FIG. 1A are changed. It is shown that the same result as in FIG. 1D is obtained within the range of the curve of δ2. As an example, as shown in Table 1 below, the dimensions (Xa, Xb, Xc, Z0, Z1, Z2, Z1', Z2'and Y0) of the permanent magnet pieces 10 and 20 shown in FIG. 1A were changed. In this case as well, it was confirmed that the same result as in FIG. 1D can be obtained within the range of the curves of δ1 and δ2 shown in FIG. 1E. Note that, unlike FIG. 1D, the vertical axis of FIG. 1E is not the force actually acting on the magnet piece, but the force is obtained at a ratio with respect to the conventional example.

As shown in FIG. 1E, when θ10 becomes smaller than 100 degrees, the repulsive force becomes 60% or less of the conventional one, and preferably when θ10 becomes smaller than 60 degrees, the repulsive force becomes 20% or less of the conventional one, more preferably. At 34 degrees or less, it can be seen that the repulsive force changes to a negative value, that is, the repulsive force changes to the adsorptive force.

In any of the examples (Examples 1 to 7 shown in Table 1), the ratio of the force acting in the X-axis direction between the magnet pieces 10 and 20 to the conventional example is the curve of δ1 and δ2 in FIG. 1E. It was confirmed that it was within the range. From this, even if the dimensions and materials of the permanent magnet pieces are changed, by combining the two permanent magnet pieces 10 and 20 adjacent to each other, the repulsive force between the magnet pieces is greatly reduced as compared with the conventional case, and as a result. It was confirmed that it further enhances economic efficiency and productivity.

Further, in the present embodiment, as shown in FIG. 1A, the sum of the angle θ21 of the obtuse angle portion 25a and the angle θ11 of the acute angle portion 15a is approximately 180 degrees. Further, the sum of the angle θ22 of the obtuse angle portion 25b and the angle θ12 of the acute angle portion 15b is approximately 180 degrees. Moreover, the thickness Z0 of the second permanent magnet piece 20 in the Z-axis direction is substantially the same as the thickness of the first permanent magnet piece 10 in the Z-axis direction, and similarly, Z1 is substantially the same as Z1'and Z2 is substantially the same as Z2'. be.

In such a relationship, the first surface 12 of the first permanent magnet piece 10 and the third surface 22 of the second permanent magnet piece 20 can be a continuous smooth surface-to-plane plane or curved surface.

From the prior art, it is conceivable to magnetize a magnet assembly to which a plurality of permanent magnet pieces are bonded in advance, but in that case, a large magnetizer is required. On the other hand, in the present embodiment, since the magnetized permanent magnet pieces can be combined to form an aggregate magnet assembly, the size of the permanent magnet assembly can be increased without using a large magnetizer. Is possible.

The permanent magnet pieces 10 and 20 of the present embodiment are formed by molding a sintered magnet such as an isotropic ferrite sintered magnet, an anisotropic ferrite sintered magnet, or an anisotropic rare earth sintered magnet into a predetermined shape, or. It can be obtained by processing the combined surface after molding.

Further, the permanent magnet pieces 10 and 20 of the present embodiment are an isotropic ferrite bond magnet, an anisotropic ferrite bond magnet, an isotropic rare earth bond magnet, and an anisotropic rare earth bond formed by kneading magnet powder into a resin. It can be obtained with a bonded magnet such as a magnet whose combined surface is formed by compression molding or injection molding.

Preferably, the permanent magnet pieces 10 and 20 are obtained by sintering a molded body obtained by CIM molding or MIM molding. By injection molding by the CIM (ceramic injection molding) method, it is possible to easily mold a molded body having a combined surface with a sharp apex angle or a bottom angle, so that the number of parts is not increased and the processing cost is reduced. It can be significantly reduced, the manufacturing process can be simplified, and the yield and magnetic characteristics can be improved, so that economic efficiency and productivity can be improved. Further, also on the combination surface, it is possible to obtain a highly anisotropic ferrite sintered magnet having a magnet orientation degree of 90% or more.

Further, in the permanent magnet pieces 10 and 20 of the present embodiment, a molded body having a combined surface having a sharp apex angle can be easily molded by injection molding by the MIM (metal injection molding) method, so that the number of parts can be increased. In addition, the processing cost can be significantly reduced, the manufacturing process can be simplified, and the yield and magnetic characteristics can be improved, so that the economy and productivity can be improved. It will be possible. Further, also on the combined surface, it is possible to obtain a highly anisotropic rare earth sintered magnet having a magnet orientation degree of 90% or more.

(Second Embodiment)
As shown in FIG. 2A, in the present embodiment, in the first permanent magnet piece 10, the thickness Z1 from the first surface 12 to the concave bottom portion 17 is made larger than the thickness Z2 from the second surface 14 to the concave bottom portion 17. There is. In that case, since the inclined lengths of the first inclined surface 16a and the second inclined surface 16b on the concave first combination surface 16 also change, the third inclined surface of the convex second combination surface 26 is correspondingly changed. The inclined lengths of the 26a and the fourth inclined surface 26b are also changed. Other configurations and effects are the same as those in the above-described embodiment. Further, in the drawings, common members are designated by a common reference numeral, and some description thereof will be omitted.

(Third Embodiment)
As shown in FIGS. 2B and 2C, in the present embodiment, at least a part of the concave bottom portion 17, the convex top portion 27 and / or the corner portions 15a, 15b, 25a, 25b is curved (R) processed or chamfered. May be made. When curved surface processing or chamfering processing is performed, corners and the like are less likely to be chipped during assembly, and the yield can be improved, so that economic efficiency and productivity can be improved. Other configurations and effects are the same as those in the above-described embodiment. Further, in the drawings, common members are designated by a common reference numeral, and some description thereof will be omitted.

(Fourth Embodiment)
As shown in FIG. 2D, in the present embodiment, the first permanent magnet piece 10 is composed of a third magnet piece 10a and a fourth magnet piece 10b, which are joined and molded. The third magnet piece 10a has a first surface 12, a first joining surface 12a facing the first surface 12, and a first inclined surface 16a connecting them with a first combination surface 16. The fourth magnet piece 10b has a second surface 14, a second joint surface 14a facing the second surface 14, and a second inclined surface 16b connecting them with the first combination surface 16.

The first permanent magnet piece 10 is formed by arranging and joining the first joining surface 12a of the third magnet piece 10a and the second joining surface 14a of the fourth magnet piece 10b so as to face each other. For this bonding, an adhesive, double-sided tape, tape winding, or the like is used. The first joining surface 12a of the third magnet piece 10a and the second joining surface 14a of the fourth magnet piece 10b may be joined before magnetization.

In the present embodiment, by joining the third magnet piece 10a and the fourth magnet piece 10b at the joining surfaces 12a and 14a of both, a concave first combination composed of the first inclined surface 16a and the second inclined surface 16b is formed. The surface 16 can be easily formed.

In the present embodiment, the thickness of the distance between the first surface 12 and the first joint surface 12a and the distance between the second surface 14 and the second joint surface 14a may be substantially the same, but they are different from each other. May be good. When the distance between the first surface 12a and the first joint surface 12a and the distance between the second surface 14 and the second joint surface 14a are substantially the same thickness, the first inclined surface 16a and the second having a symmetrical shape are formed. The concave first combination surface 16 including the inclined surface 16b can be easily formed.

Further, in the present embodiment, the shape of the third magnet piece 10a and the shape of the fourth magnet piece 10b may be substantially the same, but may be different. When the shape of the third magnet piece 10a and the shape of the fourth magnet piece 10b are substantially the same, a concave first combination surface composed of a symmetrical first inclined surface 16a and a second inclined surface 16b. 16 can be easily formed.

Further, in the present embodiment, the second permanent magnet piece 20 is composed of a fifth magnet piece 20a and a sixth magnet piece 20b, which are joined and molded. The fifth magnet piece 20a has a third surface 22, a third joint surface 22a facing the third surface 22, and a third inclined surface 26a connecting these with a second combination surface 26. The fourth magnet piece 20b has a fourth surface 24, a fourth joint surface 24a facing the fourth surface 24, and a fourth inclined surface 26b connecting them with a second combination surface 16.

The second permanent magnet piece 20 is formed by arranging and joining the third joint surface 22a of the fifth magnet piece 20a and the fourth joint surface 24a of the sixth magnet piece 20b so as to face each other. This joining is performed in the same manner as the joining of the third magnet piece 10a and the fourth magnet piece 10b.

In the present embodiment, the fifth magnet piece 20a and the sixth magnet piece 20b are joined at the joint surface of both to form a convex second combination surface 26 composed of a third inclined surface 26a and a fourth inclined surface 26b. Can be easily formed.

In the present embodiment, the thickness of the distance between the third surface 22 and the fifth joint surface 22a and the distance between the fourth surface 24 and the sixth joint surface 24a may be substantially the same, but they are different from each other. May be good. When the distance between the third surface 22a and the third joint surface 22a and the distance between the fourth surface 24 and the fourth joint surface 24a are substantially the same thickness, the third inclined surface 26a and the fourth surface having a symmetrical shape are substantially equal in thickness. The convex second combination surface 26 including the inclined surface 26b can be easily formed.

Further, in the present embodiment, the shape of the fifth magnet piece 20a and the shape of the sixth magnet piece 20b may be substantially the same, but may be different. When the shape of the fifth magnet piece 20a and the shape of the sixth magnet piece 20b are substantially the same, a convex second combination including a third inclined surface 26a and a fourth inclined surface 26b having a symmetrical shape. The surface 26 can be easily formed. Other configurations and effects are the same as those in the above-described embodiment. Further, in the drawings, common members are designated by a common reference numeral, and some description thereof will be omitted.

(Fifth Embodiment)
As shown in FIG. 2E, the permanent magnet pieces 10 and 20 of this embodiment are modifications of the permanent magnet pieces 10 and 20 shown in FIG. 2D.

In the permanent magnet piece 10 of the present embodiment, the lower surface of the fourth magnet piece 10b in the Z-axis direction becomes the additional bonding surface 12b, and the additional bonding surface 14b of the additional magnet piece 10c is bonded to the additional bonding surface 12b. The joining method is the same as that of the above-described embodiment. In the present embodiment, the lower surface of the additional magnet piece 10c in the Z-axis direction is the second surface 14, but the additional magnet piece may be further bonded under the second surface 14.

Further, in the permanent magnet piece 20 of the present embodiment, the lower surface of the sixth magnet piece 20b in the Z-axis direction becomes the additional bonding surface 22b, and the additional bonding surface 24b of the additional magnet piece 20c is bonded to the additional bonding surface 22b. The joining method is the same as that of the above-described embodiment. In the present embodiment, the lower surface of the additional magnet piece 20c in the Z-axis direction is the fourth surface 24, but the additional magnet piece may be further bonded under the fourth surface 24.

In the present embodiment, the concave bottom portion 17 and the convex top portion 17a are alternately formed on the first combination surface 16 from above in the Z-axis direction. The convex top portion 17a is composed of a second inclined surface 16b and an additional inclined surface 16c that is inclined at an acute predetermined angle θ20a with respect to the second inclined surface. The predetermined angle θ20a is determined in the same manner as the angle θ20 shown in FIG. 1A.

Further, in the present embodiment, the convex top portion 27 and the concave bottom portion 27a are alternately formed on the second combination surface 26 from above in the Z-axis direction. The concave bottom portion 27a is composed of a fourth inclined surface 26b and an additional inclined surface 26c that is inclined at an acute predetermined angle θ10a with respect to the fourth inclined surface. The predetermined angle θ10a is determined in the same manner as the angle θ10 shown in FIG. 1A.

In the present embodiment, the uneven first combination surface 16 is combined with the uneven second combination surface 26, and the first permanent magnet piece 10 and the second permanent magnet piece 20 are integrated. Other configurations and effects are the same as those in the above-described embodiment. Further, in the drawings, common members are designated by a common reference numeral, and some description thereof will be omitted.

(Sixth Embodiment)
As shown in FIG. 3, in the present embodiment, two or more pairs of permanent magnet pieces 10 and 20 are combined adjacent to each other in the X-axis direction and / or the Y-axis direction. Since the permanent magnet assembly configured in this way can be easily increased in size, it is possible to increase the degree of freedom in design while fully exhibiting the magnetic characteristics of the magnet at low cost and easily. Further, even if the adhesive strength between the combined magnet pieces deteriorates, the repulsive force is suppressed, so that the seam portion is less likely to expand and the magnetic flux amount is less likely to decrease. In addition, a large magnet with high-precision dimensions can be easily manufactured in a short time, and the gap between the magnets can be reduced, so that the non-uniformity of the magnetic field that may occur due to the gap can be reduced as much as possible. ..

In the present embodiment, the overall shape when the first permanent magnet piece 10 and the second permanent magnet piece 20 are combined is not particularly limited, and may be, for example, a square plate shape, and as shown in FIG. 4, a circle. It may be in the shape of a plate. Other configurations and effects are the same as those in the above-described embodiment. Further, in the drawings, common members are designated by a common reference numeral, and some description thereof will be omitted.

(7th Embodiment)
As shown in FIG. 5, in the present embodiment, permanent magnet pieces 200a to 200d are combined to form a large permanent magnet assembly. The permanent magnet piece 200a has a concave first combination surface 16 on one side surface in the X-axis direction, and also has a concave first combination surface 16 on one side surface in the Y-axis direction. The permanent magnet piece 200b has a convex second combination surface 26 on one side surface in the Y-axis direction and a concave first combination surface 16 on one side surface in the X-axis direction.

The permanent magnet piece 200c has a convex second combination surface 26 on one side surface in the X-axis direction, and also has a convex second combination surface 26 on one side surface in the Y-axis direction. The permanent magnet piece 200d has a convex second combination surface 26 on one side surface in the X-axis direction and a concave first combination surface 16 on one side surface in the Y-axis direction.

In the permanent magnet assembly according to the present embodiment, a combination of the first combination surface 16 and the second combination surface 26 is formed between the permanent magnet pieces 200a to 200c in the X-axis direction and the Y-axis direction. .. Similar to the above-described embodiment, the first combination surface 16 and the second combination surface 26 generate a suction force under predetermined conditions. Therefore, in the present embodiment, the first combination surface 16 and the second combination surface 26 are relatively large in the X-axis direction and the Y-axis direction. It is possible to form the functional surfaces 212a to 212d of a single magnetic pole having a single area (in this embodiment, the north pole but the south pole may be used).

The shapes of the functional surfaces 212a to 212d of the permanent magnet pieces 200a to 200d are not limited to the planar shape. For example, as shown in FIG. 6, the set of the functional surfaces 212a to 212d is a part of the cylindrical surface or the like. It may have a curved shape. Further, the overall shape of the permanent magnet assembly formed by the combination of the permanent magnet pieces 200a to 200d is not limited to the square plate shape, and may be, for example, a ring plate shape as shown in FIG. 7.

Other configurations and effects are the same as those in the above-described embodiment. Further, in the drawings, common members are designated by a common reference numeral, and some description thereof will be omitted.

(8th Embodiment)
As shown in FIG. 8, the permanent magnet assembly according to the present embodiment has at least a second permanent magnet piece 200e and a first permanent magnet piece 100e arranged on both sides in the X-axis direction thereof. The second permanent magnet piece 200e has a second combination surface 26 on both sides in the X-axis direction. The first permanent magnet piece 100e has the same configuration as the first permanent magnet piece 10 shown in FIG. 1A.

In the permanent magnet assembly according to the present embodiment, as in the above-described embodiment, the first combination surface 16 and the second combination surface 26 generate an attractive force, so that they are relatively large at least in the X-axis direction. It is possible to form the functional surfaces 112e and 212e of a single magnetic pole having a single area (in this embodiment, the north pole but the south pole may be used).

Other configurations and effects are the same as those in the above-described embodiment. Further, in the drawings, common members are designated by a common reference numeral, and some description thereof will be omitted.

(9th Embodiment)
This embodiment is the same as the permanent magnet assembly 1 according to the first embodiment shown in FIG. 1A, but the installation surface as the second surface 14 is a surface to be installed on a base material 30 such as a magnetic material yoke. Is. Examples of the base material 30 include magnetic materials such as structural carbon steel (for example, S45C), silicon steel plates, general structural rolled steel materials such as SS400, rolled steel plates such as SPCC, and magnetism such as SUS430. You can choose from stainless steel and so on.

In FIG. 1A, the force acting between the permanent magnet pieces 10 and 20 in the X-axis direction was obtained by simulation in the same state as in the first embodiment except that S45C was used as the base material 30. As in FIG. 1E, the result is obtained by obtaining the force, not the force actually acting on the magnet piece, at a ratio to the conventional example, and is shown in FIG. 1F.

As can be seen from FIG. 1F, as θ10 decreases from 180 degrees, the force acting on the permanent magnet pieces 10 and 20 (repulsive force in the X-axis direction in FIG. 1A) gradually decreases. This is because the suction force is generated between the main parts of the first combination surface 16 and the second combination surface 26, and the second surface 14 and the second surface 14 and the second surface 14 and the third surface 22 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 and the second surface 14 It shows that the repulsive force acting between the four sides 24 is reduced. The fact that θ10 is 180 degrees is the conventional permanent magnet assembly shown in FIG. 1C.

As shown in FIG. 1F, when θ10 is reduced to 100 degrees or less, the repulsive force is 60% or less of the conventional one, and preferably, when θ10 is reduced to 70 degrees or less, the repulsive force is 20% or less of the conventional one, which is more preferable. It can be seen that when θ10 is 52 degrees or less, the repulsive force changes to a negative value, that is, the repulsive force changes to the adsorption force.

Further, FIG. 1F shows δ1 even if the dimensions (Xa, Xb, Xc, Z0, Z1, Z2, Z1', Z2' and Y0) and materials of the permanent magnet pieces 10 and 20 shown in FIG. 1A are changed. It is shown that the same result as in FIG. 1D is obtained within the range of the curve of δ2. As an example, as shown in Table 2 below, the dimensions (Xa, Xb, Xc, Z0, Z1, Z2, Z1', Z2'and Y0) of the permanent magnet pieces 10 and 20 shown in FIG. 1A were changed. In this case as well, it was confirmed that the same result as in FIG. 1D can be obtained within the range of the curves of δ1 and δ2 shown in FIG. 1F.

In any of the examples (Examples 11 to 15 shown in Table 2), the ratio of the force acting in the X-axis direction between the magnet pieces 10 and 20 to the conventional example is the curve of δ1 and δ2 in FIG. 1F. It was confirmed that it was within the range. From this, even if the dimensions and materials of the permanent magnet pieces are changed, by combining the two permanent magnet pieces 10 and 20 adjacent to each other, the repulsive force between the permanent magnet pieces is greatly reduced as compared with the conventional case. As a result, it was confirmed that the economy and productivity were further enhanced.

(10th Embodiment)

The permanent magnet piece and the permanent magnet assembly according to the above-described embodiment are used in, for example, a magnetic field generator for MRI, a magnetic field generator of a plasma device, a magnetic circuit of a rotating machine, a linear motor, a permanent magnet application device such as a linear traffic system, and the like. It is used and can be applied to a wide range of fields.

FIG. 9 shows an MRI magnetic field generator 250. The magnetic field generator 250 has a casing 252 made of a ferromagnetic material, and inside the casing 254, an N-pole magnet 254 having a large-area magnetic pole surface and an S-pole magnet 256 having a large-area magnetic pole surface. Are arranged facing each other in a predetermined space. In the present embodiment, the N-pole magnet 254 and the S-pole magnet 256 can be configured by the permanent magnet assembly of the above-described embodiment, respectively.

FIG. 10 shows a magnetic field generator 302 of the plasma device 300. The magnetic field generator 302 has a ring-shaped magnet 304 and a disk-shaped magnet 306. In the present embodiment, the ring-shaped magnet 304 and the disk-shaped magnet 306 can be configured by the permanent magnet assembly of the above-described embodiment, respectively.

FIG. 11 shows the motor rotor 400. The motor rotor 400 has a rotation shaft 402. A laminated electromagnetic steel sheet 404 is laminated on the rotating shaft 402 along the axial direction thereof, and a plurality of magnets 406 are mounted on the outer periphery thereof. In this embodiment, each magnet 406 itself or a combination of magnets 406 can be configured by the permanent magnet assembly of the above-described embodiment.

FIG. 12 shows a linear motor 500. The linear motor 500 has a stator 502 and a mover 504. An electromagnetic coil 506 is arranged on the surface of the stator 502 along the moving direction of the mover 504. The mover 504 facing the stator 502 at a predetermined interval, the permanent magnet 506a magnetized to the N pole and the permanent magnet 507a magnetized to the S pole along the moving direction are described above. It can be configured by alternately fixing with the permanent magnet assembly of the embodiment.

The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention. For example, in the present invention, the above-mentioned embodiments may not be used alone, but two or more of the above-mentioned embodiments may be used in combination. Further, in the above-described embodiment, the combination surface has a concave shape or a convex shape in which all the planes are combined, but the combination surface is not limited to the flat surface and may be a concave shape or a convex shape of a curved surface.

1 ... Permanent magnet assembly 10 ... 1st permanent magnet piece 10a ... 3rd magnet piece 10b ... 4th magnet piece 10c ... Additional magnet piece 12 ... 1st surface 12a ... 1st joint surface 12b ... Additional joint surface 14 ... 2nd Surface 14a ... Second joint surface 14b ... Additional joint surface 15a, 15b ... Tip corner 16 ... First combination surface 16a ... First inclined surface 16b ... Second inclined surface 16c ... Additional inclined surface 17 ... Concave bottom 17a ... Convex Top 18 ... Side surface 20 ... 2nd permanent magnet piece 20a ... 5th magnet piece 20b ... 6th magnet piece 20c ... Additional magnet piece 22 ... 3rd surface 22a ... 3rd joint surface 22b ... Additional joint surface 24 ... 4th surface 24a ... 4th joint surface 24b ... Additional joint surface 25a, 25b ... Base end angle portion 26 ... 2nd combination surface 26a ... 3rd inclined surface 26b ... 4th inclined surface 26c ... Additional inclined surface 27 ... Convex top 27a ... Concave bottom 28 ... Side 30 ... Base material

Claims (14)

A permanent magnet assembly having a first permanent magnet piece and a second permanent magnet piece connected to the first permanent magnet piece.
The first permanent magnet piece is
It has a first surface, a second surface facing the first surface, and at least one first combination surface formed so as to connect the first surface and the second surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the first surface and / or the second surface.
The first combination surface has at least a first inclined surface and a second inclined surface constituting different planes.
The second permanent magnet piece is
It has a third surface, a fourth surface facing the third surface, and at least one second combination surface formed to connect the third surface and the fourth surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the third surface and / or the fourth surface.
The second combination surface has at least a third inclined surface and a fourth inclined surface constituting different planes.
The first inclined surface and the third inclined surface are substantially parallel so that the first combined surface and the second combined surface are combined and connected, and the second inclined surface and the fourth inclined surface are substantially parallel to each other. The surface is almost parallel ,
The first permanent magnet piece is
A third magnet piece having at least the first surface, a first joining surface facing the first surface, and the first inclined surface.
It has a fourth magnet piece having the second surface, a second joining surface facing the second surface, and the second inclined surface.
A permanent magnet assembly characterized in that the first joint surface and the second joint surface are arranged so as to face each other.
The first inclined surface forms an acute angle with the first surface, the second inclined surface forms an acute angle with the second surface, and the third inclined surface forms an obtuse angle with the third surface. 4. The permanent magnet assembly according to claim 1, wherein the inclined surface has an obtuse angle with the fourth surface. The permanent magnet according to claim 1 or 2 , wherein the distance between the first surface and the first joint surface and the distance between the second surface and the second joint surface are substantially the same thickness. Assembly. The permanent magnet assembly according to any one of claims 1 to 3 , wherein the angle between the first surface and the first inclined surface and the angle between the second surface and the second inclined surface are substantially the same. Solid. The permanent magnet assembly according to any one of claims 1 to 4 , wherein the shape of the third magnet piece and the shape of the fourth magnet piece are substantially the same. A permanent magnet assembly having a first permanent magnet piece and a second permanent magnet piece connected to the first permanent magnet piece.
The first permanent magnet piece is
It has a first surface, a second surface facing the first surface, and at least one first combination surface formed so as to connect the first surface and the second surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the first surface and / or the second surface.
The first combination surface has at least a first inclined surface and a second inclined surface constituting different planes.
The second permanent magnet piece is
It has a third surface, a fourth surface facing the third surface, and at least one second combination surface formed to connect the third surface and the fourth surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the third surface and / or the fourth surface.
The second combination surface has at least a third inclined surface and a fourth inclined surface constituting different planes, and at least the third surface, a third joint surface facing the third surface, and the third inclined surface. A fifth magnet piece having a surface and
It has a sixth magnet piece having the fourth surface, the fourth joint surface facing the fourth surface, and the fourth inclined surface.
It is configured by arranging the third joint surface and the fourth joint surface so as to face each other.
The first inclined surface and the third inclined surface are substantially parallel so that the first combined surface and the second combined surface are combined and connected, and the second inclined surface and the fourth inclined surface are substantially parallel to each other. The surface is almost parallel
A permanent magnet assembly characterized by that. The permanent magnet assembly according to claim 6 , wherein the distance between the third surface and the third joint surface and the distance between the fourth surface and the fourth joint surface are substantially the same thickness. .. The permanent magnet assembly according to claim 6 or 7 , wherein the angle between the third surface and the third inclined surface and the angle between the fourth surface and the fourth inclined surface are substantially equal to each other. The permanent magnet assembly according to any one of claims 6 to 8 , wherein the shape of the fifth magnet piece and the shape of the sixth magnet piece are substantially the same. The permanent magnet assembly according to claim 2 , wherein the sum of the obtuse angle and the acute angle is approximately 180 degrees.
The permanent magnet assembly according to claim 2 , wherein the acute angle is 50 degrees or less.
The permanent magnet assembly according to claim 2 , wherein the obtuse angle is 130 degrees or more.
A permanent magnet assembly having a first permanent magnet piece and a second permanent magnet piece connected to the first permanent magnet piece.
The first permanent magnet piece is
It has a first surface, a second surface facing the first surface, and at least one first combination surface formed so as to connect the first surface and the second surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the first surface and / or the second surface.
The first combination surface has at least a first inclined surface and a second inclined surface constituting different planes, and the second permanent magnet piece has a second inclined surface.
It has a third surface, a fourth surface facing the third surface, and at least one second combination surface formed to connect the third surface and the fourth surface.
Magnetized so as to have a magnetic flux substantially perpendicular to the third surface and / or the fourth surface.
The second combination surface has at least a third inclined surface and a fourth inclined surface constituting different planes.
It also has a base material made of magnetic material,
The base material has a first permanent magnet piece and an installation surface on which the second permanent magnet piece is placed.
So that the magnetic poles on the first surface of the first permanent magnet piece and the magnetic poles on the third surface of the second permanent magnet piece are the same.
The second surface of the first permanent magnet piece and the fourth surface of the second permanent magnet piece are attracted to the installation surface and at the same time.
The first inclined surface and the third inclined surface are substantially parallel so that the first combined surface and the second combined surface are combined and connected, and the second inclined surface and the fourth inclined surface are substantially parallel to each other. A permanent magnet assembly characterized by being substantially parallel to the surface.
A permanent magnet application device using the permanent magnet piece assembly according to any one of claims 1 to 13.

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