JPH09298122A - Manufacturing of anisotropic resin magnet and manufacturing die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the intensity of the orientated magnetic field of a magnetic flux generating part enhance significantly by a method wherein a plurality of permanent magnets are arranged in contact with four or more surfaces of a plurality of ferromagnetic material magnetic poles, excluding one surface which faces a cavity. SOLUTION: A resin mixed with magnetic powder is melted to inject in a die through an injection port and cast from the die into a cavity 1 through a primary spool 3, a runner 6 and a secondary spool 7. The cavity 1 is installed in a magnetic field due to a magnetic flux generating part, which comes into contact with each surface other than one surface, which face the cavity 1 of ferromagnetic material magnetic poles 12A and 12B and is provided with permanent magnets 2A1, 2A2, 2B2, 9A, 9B, 10A and 10B in such a way that the same poles of the magnets turned to the magnetic poles 12A and 12B. When the molten magnetic powder mixed resin is solidified by cooling in the cavity and is formed into a molded item, the magnetic powder mixed powder is anisotropically orientated by the magnetic field due to the magnetic flux generating part. In such a way, by providing the magnetic flux generating part, an two-pole transverse orientated magnetic field is formed in the generating part, so that the magnetic characteristics of an anisotropic resin magnet can be enhanced and stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an anisotropic resin magnet used in a motor, various meters, lenses, camera shutter units, etc., and a mold used in the method, and more particularly to generation of an orientation magnetic field. It is related to the method.

[0002]

2. Description of the Related Art In the case of molding a magnet having resin-bonded magnetic powder, it is necessary to apply a magnetic field to anisotropy the magnetic powder in order to improve magnetic characteristics. As a method of generating a magnetic field, an electromagnet method in which a coil is installed in a molding machine or a mold and a permanent magnet method in which a permanent magnet is installed in a mold are known.

However, the electromagnet method in the above-mentioned conventional example requires a power source, a coil, etc. for generating a magnetic field, which requires facility cost and multi-orientation such as polar anisotropic orientation is difficult. Since the permanent magnet method installs a permanent magnet in the mold, it does not require a power source, etc., and it is possible to reduce equipment costs. Multi-polar orientation such as polar anisotropic orientation is also possible, but the magnetic field The strength was weak, and sufficient orientation could not be achieved.

FIG. 25 shows an arrangement of a mold cavity and a permanent magnet used in a conventional permanent magnet system. FIG. 26 shows a sectional view of the cavity portion of FIG. The cavity 1 is formed in the magnetic field generated by the permanent magnet 2. When the resin mixed with the magnetic powder is melted and poured into the mold, it is filled in the cavity 1 through the runner 6 and the secondary spool 7, and when it is solidified in that state, the magnetic powder magnetically oriented in the direction of the magnetic field becomes the resin. The magnets joined by are molded. In addition,
Reference numeral 4 is a magnetic flux line, 5 is a movable side template, and 8 is a fixed side template. In the case of using the conventional mold, the magnetic flux density applied to the cavity 1 is determined by the strength of the permanent magnet 2, so that the strength of the magnetic flux density is limited. In particular, when a rare earth magnetic powder having a large coercive force was used as the magnetic powder, its orientation was difficult.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above problems, makes use of the advantages of the permanent magnet system, and can greatly improve the magnitude of the orienting magnetic field, thereby producing an anisotropic resin magnet. The purpose is to provide a method.

Further, the present invention provides a method for producing an anisotropic resin magnet, which can greatly improve the magnitude of the orienting magnetic field and can orient even if rare earth magnetic powder is used as the magnetic powder. The purpose is to provide.

Still another object of the present invention is to provide a mold having a large orientation magnetic field used for producing an anisotropic resin magnet.

[0008]

MEANS FOR SOLVING THE PROBLEMS A mold for producing an anisotropic resin magnet according to the present invention is symmetrically arranged around a cavity filled with a molten resin mixed with magnetic powder. A plurality of ferromagnetic magnetic poles having one surface facing each other, and excluding the one surface of the plurality of ferromagnetic magnetic poles 4
It is characterized in that it has a magnetic flux generating section consisting of a plurality of permanent magnets that are in contact with one or more surfaces and that are arranged with the same pole facing the same magnetic pole.

In the mold for producing an anisotropic resin magnet of the present invention, it is preferable that the ferromagnetic magnetic pole is a triangular pole. Further, it is preferable that the ferromagnetic pole is a square pole.

In the mold for producing the anisotropic resin magnet of the present invention, it is more preferable that at least one of the permanent magnets is movable.

In the method for producing an anisotropic resin magnet of the present invention, a plurality of magnets are arranged symmetrically with respect to the cavity filled with the molten resin mixed with the magnetic powder, each surface having one surface facing the cavity. Magnetic flux generation consisting of ferromagnetic magnetic poles and a plurality of permanent magnets that are in contact with four or more surfaces of the plurality of ferromagnetic magnetic poles except the one surface and that are arranged with the same poles facing the same magnetic pole. A mold having a part is filled with a molten resin mixed with magnetic powder, and the molten resin is solidified while anisotropically orienting the magnetic powder in a magnetic field generated by the magnetic flux generating part. Is formed.

In the method for producing an anisotropic resin magnet of the present invention, it is preferable to move at least one of the permanent magnets to adjust the strength of the magnetic field.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention can be implemented by using, for example, a mold shown in FIGS. 1 is a cross-sectional view of the mold, and FIG. 2 is a top view of a movable-side mold plate 5 in the mold of FIG. A locating ring 3a is provided on the upper part of the mold to define an injection port, and a spool bush 3b for fixing the primary spool 3 is provided below the locating ring 3a. The resin in which the magnetic powder is mixed is melted and injected into the mold through the injection port, and the cavity 1 is filled through the primary spool 3, the runner 6 and the secondary spool 7. The cavity 1 includes a permanent magnet 2A1, 2A2, 9A, 10A and a magnetic flux generating portion composed of a ferromagnetic pole 12A and the permanent magnet 2.
B1, 2B2, 9B, 10B and ferromagnetic pole 12B
It is installed in the magnetic field due to the magnetic flux generator. When the molten magnetic powder mixed resin is cooled and solidified in the cavity to form a molded product, the magnetic powder is anisotropically oriented by the magnetic field generated by the magnetic flux generating section. When the anisotropic resin magnet is molded, the movable side mold plate 5 is moved in parallel, and the molded product is ejected by the ejector pin 11.

On the upper part of the die, a fixed side mounting plate 3c, a stripper plate 3f, a fixed side mold plate 8 and a movable side mold plate 5 are provided.
Is installed, and the receiving plate 3g is installed below it. These are fixed by a support pin 3d fitted in the bush 3e. A spacer block 3h is provided between the receiving plate and the movable side mounting plate 3j, and an ejector plate 3i is provided on the movable side mounting plate.

Here, the magnetic flux generator mounted on the mold of the present invention will be described in detail.

FIG. 3 is a top view of the movable side mold plate 5 showing the arrangement of the cavity, the permanent magnet and the ferromagnetic material of the mold of the two-pole transverse magnetic field orientation system, which is a view showing the characteristics of the present invention most. Is one of. FIG. 4 is a cross-sectional view of a cavity portion of a two-pole transverse magnetic field orientation type mold. The resin mixed with the magnetic powder is melted, flows through the runner 6, passes through the secondary spool 7 that connects the runner and the cavity, and is filled in the cavity 1.
The cavity is formed in the non-magnetic movable mold plate 5,
Since the anisotropic resin magnet molded in the cavity is pushed out by the ejector pin 11 and pushed out from the mold, the movable side mold plate can be moved in parallel. The fixed-side mold plate 8 made of a non-magnetic material is installed on the movable-side mold plate, and the permanent magnets 9A and 9B are fixed-side mold plates so as to contact the triangular pole-shaped ferromagnetic poles 12A and 12B. Embedded in 8. Permanent magnets 10A and 10B are embedded in contact with the back surfaces of the ferromagnetic magnetic poles 12A and 12B, respectively.

The permanent magnets 2A1, 2A2, 2A1, 2A2 are in contact with the respective surfaces of the ferromagnetic pole 12A other than the surface facing the cavity 1.
By arranging 9A and 10A so that the same pole faces the magnetic pole 12A, the magnetic flux generated from each permanent magnet is guided to the surface facing the cavity 1. Permanent magnets 2B1 and 2B that are formed in different pole directions and are oriented in the same direction toward the magnetic pole 12B at positions inverted by 180 ° with respect to the cavity 1.
By providing a magnetic flux generation section in which 2, 9B and 10B are arranged in contact with the ferromagnetic pole 12B, an orientation magnetic field of a two-pole transverse magnetic field is formed. Here, 4 represents a magnetic flux line.

Further, the present invention can be carried out by using a mold having a cavity portion shown in FIGS. 5 and 6, for example. FIG. 5 is a top view of the movable side template 5 showing the arrangement of the two-pole transverse magnetic field orientation type cavity, the permanent magnet and the ferromagnetic pole, and FIG. 6 is the cavity portion of the two-pole transverse magnetic field orientation type FIG. FIG.

Here, the ferromagnetic magnetic pole 12aA is a hexahedron, and the permanent magnets 2A1, 2A2, 9A are in contact with the five faces thereof,
10A and 13A are arranged. The directions of the magnetic poles of the permanent magnets are the same as those in the examples of FIGS. In this example, the number of permanent magnets is larger than in the cases of FIGS. For this reason,
The mold of FIG. 6 can generate a higher magnetic flux density than the molds of FIGS. 3 and 4, and thus an anisotropic resin magnet having a larger magnetic orientation can be manufactured.

The present invention can also be carried out by using a mold having a cavity shown in FIGS. 7 and 8. 8 in FIG.
FIG. 6 is a top view of the movable-side template 5 showing the arrangement of the polar-anisotropic orientation type cavity, the permanent magnet, and the ferromagnetic pole.
FIG. 8 shows a sectional view of the cavity portion of FIG. Reference numeral 15 is a sleeve made of a non-magnetic material, 17B and 18B are permanent magnets, and 5 is a movable-side template made of a non-magnetic material. Eight hexahedral ferromagnetic magnetic poles 16B are symmetrically arranged around the cavity 1, and trapezoidal columnar permanent magnets 17B are provided between the magnetic poles in contact with the magnetic poles. The permanent magnet 17 is in contact with the five faces of the ferromagnetic pole 16B.
B, 18B, 19B, 23B and 24B are arranged. The orientation of each permanent magnet is the same as in the example of FIGS.
The permanent magnet 17B is composed of adjacent ferromagnetic magnetic poles 16B and 14B.
It is shared by the above, and by arranging the N pole and the S pole alternately, octupole polar anisotropic alignment becomes possible.

The permanent magnet 23B is embedded in the fixed-side mold plate 8, and the permanent magnets 18B and 24B are embedded in the movable-side mold plate 5. Permanent magnets 17B, 18B, 19B, 2
The magnetic flux generated from 3B and 24B is the ferromagnetic magnetic pole 16B.
Be led to. By disposing a permanent magnet with the same pole facing the same magnetic pole on the surface other than the surface facing the cavity 1 of the ferromagnetic pole 16B, the magnetic flux generated from the permanent magnet is transferred to the surface facing the cavity 1. Is leading.

The magnetic pole density of the octupole polar anisotropic resin magnet formed by using the die of the octupole polar anisotropic orientation system of FIG. 7 is about twice as high as that in the case of using the conventional die of FIG. Since it is manufactured in a magnetic field, it can have a large magnetic anisotropy.

The present invention can also be carried out by using a mold having a cavity portion shown in FIGS. 9, 10 and 11.
FIG. 9 is one of the drawings that best represents the features of the present invention.
FIG. 9 shows a two-pole transverse magnetic field orientation type cavity and at least one
It is a figure showing arrangement | positioning of two movable permanent magnets and a magnetic pole of a ferromagnetic substance, and FIG. 10 is a figure showing the position of the permanent magnet after a movement. Further, FIG. 11 shows a sectional view of the cavity portion shown in FIG.

The movable mold plate 5 is provided with a space 21 in which the permanent magnet holder 20B can move, and the permanent magnet holder can move in parallel along the surface of the ferromagnetic pole 12aB. The permanent magnet 13B is embedded in the permanent magnet holder 20B. When the permanent magnet holder holding the permanent magnet 13B is moved, an escape path for the magnetic flux lines 4 is created. This makes it possible to continuously change the amount of magnetic flux generated from the surface in contact with the cavity. In the present invention, instead of the permanent magnet 13B, the permanent magnet 9B or 10B may be movable so that an escape path for magnetic flux lines can be created.

The present invention can be carried out by using the mold having the cavity portion with the dipole transverse magnetic field orientation shown in FIGS. 12, 13 and 14. FIG. 12 is a diagram showing the arrangement of the cavities having a two-pole transverse magnetic field orientation and at least one movable permanent magnet and a ferromagnetic material, and FIG. 13 is a sectional view of the cavity portion of FIG. FIG. 14 is a diagram showing the position of the permanent magnet after moving the permanent magnet held by the permanent magnet holder. 9 and 10 except that the permanent magnet 9B embedded in the stationary template is movable instead of the permanent magnet embedded in the movable template. That is, the permanent magnet holder 20 is attached to the fixed-side template 8.
A space 21 in which B can be moved is provided, and the permanent magnet holder can be moved in parallel on the surface of the ferromagnetic pole 12B. In addition, 22 is a leakage magnetic flux line.

The present invention can also be carried out by using the mold shown in FIGS. 15 and 16 having a cavity for octupole polar anisotropic alignment. FIG. 15 shows a cavity having an octupole polar anisotropic orientation,
FIG. 16 is a view showing an arrangement of at least one movable permanent magnet and a ferromagnetic material, and FIG. 16 is a sectional view of the cavity portion of FIG. 15.

Similar to the case of FIGS. 12, 13 and 14, the permanent magnet 23B embedded in the fixed-side template 8 is movable. That is, the space 21 in which the permanent magnet holder 20B holding the permanent magnet 23B in the fixed-side template 8 can move.
Is provided, and the permanent magnet holder is a ferromagnetic magnetic pole 1
It can be moved in parallel on the surface of 6B. The magnetic flux between the poles can be adjusted by changing the amount of movement of a movable permanent magnet such as the permanent magnet 23B for each pole. This makes it easier to adjust the amount of magnetic flux generated from the surface in contact with the cavity than in the cases of FIGS. 12, 13, and 14.

The magnetic powder used in the present invention includes ferrite-based and Sm-Co-based, Nd-Fe-B-based, and Sm.
Examples thereof include rare earth magnetic powders such as —Fe—N system.

The resin used in the present invention may be a thermoplastic resin. For example, polyamide is preferably used.

As the permanent magnet used in the mold of the present invention, Nd-Fe-B having a maximum energy product of 20 MGOe is used.
Examples include a system sintered magnet and a SmCo system sintered magnet having a maximum energy product of 20 MGOe or more.

The ferromagnetic magnetic pole used in the mold of the present invention is preferably a ferromagnetic material having a high saturation magnetic flux density and a high magnetic permeability, and examples thereof include pure iron, silicon steel sheet, and iron-cobalt alloy.

[0032]

EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples.

Example 1 Ferrite, Sm-Co, Nd-Fe as magnetic powder
Four kinds of resin magnet raw materials were prepared by mixing one of the -B and Sm-Fe-N magnetic powders with polyamide. Polyamides mixed with these magnetic powders were melted and filled in the mold cavities shown in FIGS. 3 and 4 to form four types of anisotropic resin magnets. However,
The permanent magnet of the mold is an Nd-Fe-B based sintered magnet using a material with a maximum energy product of 35 MGOe, and the ferromagnetic magnetic pole has a saturation magnetic flux density of 1500 considering the strength of the steel material.
Pre-hardened steel of 0 Oe was used.

Example 2 Four types of anisotropic resin magnets were formed in the same manner as in Example 1 except that the cavity, the permanent magnet, and the ferromagnetic magnetic pole were changed from those in FIG. 3 to those in FIG. .

Example 3 Four kinds of anisotropic resin magnets were formed in the same manner as in Example 1 except that the cavity, the permanent magnet, and the ferromagnetic magnetic pole were changed from those in FIG. 3 to those in FIG. . Example 4 Four kinds of anisotropic resin magnets were formed in the same manner as in Example 1 except that the cavity, the permanent magnet, and the ferromagnetic magnetic poles shown in FIG. 9 were used instead.

Example 5 Four kinds of anisotropic resin magnets were formed in the same manner as in Example 1 except that the cavity, the permanent magnet and the magnetic pole of the ferromagnetic material were replaced with those of FIG. .

Comparative Example 1 Four kinds of anisotropic resin magnets were formed in the same manner as in Example 1, except that the conventional cavity shown in FIG. 25 not using magnetic poles and the permanent magnet were used.

Comparative Example 2 Four kinds of anisotropic resin magnets were formed in the same manner as in Example 1 except that a weak magnetic material magnetic pole such as copper was used instead of the ferromagnetic material magnetic pole shown in FIG. .

FIG. 17 shows permanent magnets 2A1, 2A2, 2B.
1 and 2B2, ferromagnetic poles 12A and 12B, and two of the cavity parts of the mold shown in FIG.
The orientation state of the extreme transverse magnetic field is shown. Here, 4 represents a magnetic flux line,
4a represents a magnetic powder. FIG. 18 shows the magnetized state of the molded product, and FIG. 19 shows the distribution state of the surface magnetic flux density of the molded product. It can be seen from FIG. 19 that this resin magnet is magnetized in a biaxial orientation. 20 and 21, the first embodiment according to the present invention is shown.
FIG. 22 and FIG. 23 show magnetic flux diagrams under the conditions of No. 2 and FIG. 23, respectively, showing a magnetic flux diagram according to Comparative Example 2 in which a weak magnetic material magnetic pole is provided instead of the ferromagnetic magnetic pole. However, here, the xy plane is
In the mold of FIG. 2, the horizontal direction is the y direction, and the vertical direction is the x direction, which is a plane including the x direction and the y direction.
Further, the yz plane is a plane including the x direction and the z direction, where the direction perpendicular to the xy plane, that is, the gravity direction is the z direction. From FIGS. 20 to 24, it was found that the magnetic flux becomes very dense when the magnetic poles of the ferromagnetic material are arranged in the permanent magnet according to the present invention.

FIG. 24 shows the distribution of the magnetic flux density in the case of Comparative Example 1 of the conventional example, the case of Comparative Example 2, and the case of Example 1. According to this, Example 1 using a ferromagnetic material
It was found that the magnetic flux density of 1 is much higher than that of Comparative Example 1 using no ferromagnetic material or Comparative Example 2 using a weak magnetic material.

When the anisotropic resin magnet formed by using the mold of FIG. 7 has a magnet outer shape of 6 mm, the magnetic flux density measured at the cavity center had a magnetic flux density of 1 tesla or more. The magnetic flux density of the resin formed using the conventional cavity of FIG. 25 and FIG. 26 (using a permanent magnet with a maximum energy product of 35 MGOe) is 5000 G at the cavity center.
It was about AUSS. From this, it was found that the anisotropic resin magnet formed according to the present invention can obtain a large orientation magnetic field. That is, according to the present invention, the magnetic powder was sufficiently anisotropy to improve the magnetic characteristics of the magnet. Further, it was possible to improve the orientation rate even when the rare earth magnetic powder was used.

[0042]

As described above, according to the present invention,
By using an inexpensive permanent magnet, the magnetic powder was sufficiently anisotropy, and the magnetic characteristics of the anisotropic resin magnet were improved and stabilized.

Further, in the rare earth resin magnet, which is difficult to be oriented, the orientation rate can be improved and the magnetic characteristics can be improved.

By using an inexpensive permanent magnet, a significantly stronger orienting magnetic field than the conventional one can be obtained, and the intensity of the orienting magnetic field, which has been difficult with the permanent magnet method, can be adjusted. The characteristics were improved and stabilized. Further, in this method, since the strength of the orientation magnetic field can be adjusted at each magnetic pole position, the magnetic force at each pole in the multipolar anisotropic orientation can be varied and the variation within the magnetic pole can be improved. It was It is also possible to make any pole strong or weak.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold of the present invention.

FIG. 2 is a top view of a movable side mold plate of the mold of the present invention.

FIG. 3 is a diagram showing the arrangement of a cavity of a mold having a two-pole orientation, a permanent magnet and a ferromagnetic material.

4 is a cross-sectional view of the cavity portion of FIG.

FIG. 5 is a diagram showing an arrangement of a cavity of a mold having a two-pole orientation, a permanent magnet and a ferromagnetic material.

6 is a cross-sectional view of the cavity portion of FIG.

FIG. 7 is a diagram showing an arrangement of cavities of a mold having 8-pole orientation, permanent magnets, and a ferromagnetic material.

FIG. 8 is a cross-sectional view of the cavity portion of FIG.

FIG. 9 is a diagram showing the arrangement of a cavity of a mold having a two-pole orientation, a permanent magnet and a ferromagnetic material.

FIG. 10 is a diagram showing an arrangement of a cavity, a permanent magnet and a ferromagnetic material after moving the permanent magnet in FIG.

11 is a cross-sectional view of the cavity portion of FIG.

FIG. 12 is a diagram showing the arrangement of a cavity, a permanent magnet, and a ferromagnet in a mold having a two-pole orientation.

13 is a cross-sectional view of the cavity portion of FIG.

14 is a cross-sectional view of the cavity after moving the permanent magnet in FIG.

FIG. 15 is a diagram showing an arrangement of cavities, permanent magnets, and ferromagnets in an 8-pole oriented mold.

16 is a cross-sectional view of the cavity portion of FIG.

FIG. 17 is a diagram showing a magnetic field state of bipolar orientation.

FIG. 18 is a diagram showing a magnetized state of an anisotropic resin magnet molded product.

FIG. 19 is a diagram showing a distribution state of surface magnetic flux density of an anisotropic resin magnet.

FIG. 20 is a diagram showing calculated values of magnetic flux lines in the xy plane of the cavity portion of FIG. 3.

FIG. 21 is a diagram showing calculated values of magnetic flux lines in the yz plane of the cavity portion of FIG. 3.

22 is a diagram showing calculated values of magnetic flux lines in the xy plane of the cavity portion of FIG. 25.

FIG. 23 is a diagram showing calculated values of magnetic flux lines in the yz plane of the cavity portion of FIG. 25.

FIG. 24 is a diagram showing a magnetic flux density distribution in the y direction of a cavity portion.

FIG. 25 is a diagram showing an arrangement of a cavity and a permanent magnet of a conventional mold.

26 is a cross-sectional view of the cavity portion of FIG.

[Explanation of symbols]

 1 cavity 2A1 permanent magnet 2A2 permanent magnet 2B1 permanent magnet 2B2 permanent magnet 3 primary spool 3a locate ring 3b spool bush 3c fixed side mounting plate 3d support pin 3e bush 3f stripper plate 3g receiving plate 3h spacer block 3i ejector plate 3j movable side Plate 4 Magnetic flux line 4a Magnetic powder 5 Non-magnetic movable side mold plate 6 Runner 7 Secondary spool 8 Non-magnetic fixed side mold plate 9A Permanent magnet 9B Permanent magnet 10A Permanent magnet 10B Permanent magnet 11 Ejector pin 12A Ferromagnetic pole 12B Ferromagnetic material Magnetic pole 12aA Ferromagnetic pole 12aB Ferromagnetic pole 13A Permanent magnet 13B Permanent magnet 14B Ferromagnetic pole 15 Non-magnetic sleeve 16B Ferromagnetic pole 17B Permanent magnet 18B Permanent magnet 19B Permanent magnet 20A Permanent magnet Permanent magnet holder 20B Permanent magnet holder 21 Space for moving permanent magnet holder 22 Leakage magnetic flux line 23B Permanent magnet 24B Permanent magnet

Claims (12)

[Claims] 1. A plurality of ferromagnetic magnetic poles symmetrically arranged around a cavity filled with a molten resin mixed with magnetic powder, each having one surface facing the cavity, and the plurality of ferromagnetic poles. Anisotropy, characterized in that it has a magnetic flux generation section consisting of a plurality of permanent magnets that are in contact with four or more surfaces other than the one surface of the body magnetic pole, and are arranged with the same pole facing the same magnetic pole. Mold for resin magnet manufacturing. 2. The mold for producing an anisotropic resin magnet according to claim 1, wherein the number of the magnetic poles is two. 3. The mold for producing an anisotropic resin magnet according to claim 1, wherein there are three or more ferromagnetic magnetic poles. 4. The mold for producing an anisotropic resin magnet according to claim 1, wherein the ferromagnetic pole is a triangular pole. 5. The mold for producing an anisotropic resin magnet according to claim 1, wherein the ferromagnetic pole is a square pole. 6. The mold for producing an anisotropic resin magnet according to claim 1, wherein at least one of the permanent magnets is movable. 7. A plurality of ferromagnetic magnetic poles symmetrically arranged around a cavity filled with a molten resin mixed with magnetic powder, each having one surface facing the cavity, and the plurality of ferromagnetic poles. The magnetic powder is placed in a mold having a magnetic flux generating section composed of a plurality of permanent magnets that are in contact with four or more surfaces other than the one surface of the body magnetic pole and have the same pole facing the same magnetic pole. Fill the mixed molten resin,
A method for producing an anisotropic resin magnet, characterized in that the molten resin is solidified while anisotropically orienting the magnetic powder in a magnetic field generated by the magnetic flux generator to form a molded product. 8. The method for producing an anisotropic resin magnet according to claim 7, wherein the number of the ferromagnetic magnetic poles is two. 9. The method for producing an anisotropic resin magnet according to claim 7, wherein the number of the ferromagnetic magnetic poles is three or more. 10. The method for producing an anisotropic resin magnet according to claim 7, wherein the ferromagnetic pole is a triangular pole. 11. The method for producing an anisotropic resin magnet according to claim 7, wherein the ferromagnetic magnetic pole is a square pole. 12. The strength of the magnetic field is adjusted by moving at least one of the permanent magnets.
12. The method for producing an anisotropic resin magnet according to any one of 1 to 11.