KR20170043716A - Permanent magnet forming device - Google Patents

Permanent magnet forming device Download PDF

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Publication number
KR20170043716A
KR20170043716A KR1020150142903A KR20150142903A KR20170043716A KR 20170043716 A KR20170043716 A KR 20170043716A KR 1020150142903 A KR1020150142903 A KR 1020150142903A KR 20150142903 A KR20150142903 A KR 20150142903A KR 20170043716 A KR20170043716 A KR 20170043716A
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South Korea
Prior art keywords
permanent magnet
magnet
end plate
magnetic flux
disposed
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KR1020150142903A
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Korean (ko)
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KR101745151B1 (en
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박건민
이형주
이재령
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현대자동차주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0266—Moulding; Pressing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Powder Metallurgy (AREA)

Abstract

The present invention relates to a permanent magnet forming device capable of forming a permanent magnet having a long magnetization direction and uniform magnetic flux density by improving a magnetic field applying method. According to an embodiment of the present invention, the permanent magnet forming device comprises: a mold having a cavity in which a magnet is formed while being magnetized in a longitudinal direction; and a pair of electromagnets magnetizing the formed magnet by winding a coil around an iron core disposed at both ends in a width direction of the mold to be parallel with the magnetizing direction of the magnet formed in the cavity.

Description

[0001] PERMANENT MAGNET FORMING DEVICE [0002]

The present invention relates to a permanent magnet molding apparatus, and more particularly, to a permanent magnet molding apparatus capable of forming a permanent magnet having a long magnetization direction and uniform magnetic flux density by improving a magnetic field application method.

Nd-Fe-B based permanent magnets are increasingly used because of their excellent magnetic properties. In recent years, as the interest in environmental problems has increased, the applications of magnets to industrial appliances, electric vehicles, and wind power generators have been gradually expanded, so that the performance of Nd-Fe-B magnets has been demanded. In particular, in order to improve the fuel economy of a hybrid electric vehicle (HEV) vehicle, a high-performance magnet capable of producing a higher output in a limited-sized driving motor is required.

In the production of such Nd-Fe-B based permanent magnets, a 'magnetic field shaping' process is performed in which a strong magnetic field is applied to the powder to form anisotropic properties while the powder is aligned in the NS direction in the lattice direction .

1, a general permanent magnet molding apparatus in which a magnetic field forming process is performed as shown in FIG. 1 is a molding apparatus in which a magnetic field forming process of a general permanent magnet is performed. In the conventional permanent magnet forming apparatus, a cavity 11a, A lower mold 11 formed thereon; An upper mold 12 having a punch 12a having a shape corresponding to the cavity 11a so as to apply pressure to the powder filled in the cavity 11a of the lower mold 11; And an electromagnet 20 in which a coil 22 is wound on an iron core 21 so as to magnetize a magnet to be formed in the cavity 11a (hereinafter, referred to as a 'molded body'). The electromagnet 20, that is, the iron core 21 provided in a general molding apparatus was arranged in line with the magnetization direction (N pole-S pole direction) of the molded body, and a magnetic field was applied.

In recent years, however, the magnetic field formed by the electromagnets is insufficiently formed in the central portion of the formed body, and the center alignment of the formed body does not reach a desired level, resulting in the dimension of the formed body becoming long in the magnetization direction (Usually 50 mm or less)

Korean Patent Publication No. 10-2004-0104591 (December 10, 2004)

The present invention provides a permanent magnet molding apparatus capable of forming a permanent magnet having a long magnetization direction and uniform magnetic flux density by improving the arrangement of a mold and an electromagnet used in a magnetic field forming process.

According to an aspect of the present invention, there is provided an apparatus for molding a permanent magnet, comprising: a mold having a cavity in which a magnet is formed by magnetization in a longitudinal direction; And a pair of electromagnets magnetizing the magnet to be formed by winding a coil on an iron core disposed at both ends in the width direction of the mold so as to be parallel to the magnetization direction of the magnet formed in the cavity.

And a pair of end plates disposed at both ends of the mold in the longitudinal direction of the mold so as to be perpendicular to a magnetization direction of the magnet formed in the cavity, the magnetic lines of force generated in the electromagnet being constituted by a closed magnetic circuit.

And the pair of end plates are disposed so as to block both ends of the mold and the electromagnet at the same time.

The end plate is an iron-based material having a saturation magnetic flux density of 2T or more and a specific magnetic permeability of 1 or more.

The B end A end of the end plate 300 and the B coil A coil ratio of the electromagnet are 100% or more.

Where B coil is the saturation magnetic flux density of the coil , A coil is the cross sectional area of the coil, B end is the saturation magnetic flux density of the end plate 300, and A end is the cross sectional area of the end plate 300.

And auxiliary permanent magnets are further disposed on at least one of the side surfaces of the pair of end plates.

Wherein the auxiliary permanent magnet is disposed on a side surface of a selected end plate of the pair of end plates opposite to a surface facing the mold and arranged in the same polarity as the polarity of the magnet formed in the cavity, And a first auxiliary permanent magnet having a width corresponding to a cavity width of the metal mold.

Wherein the auxiliary permanent magnet is disposed on a side surface of a selected end plate of the pair of end plates opposite to a surface facing the mold and arranged in a polarity in the same direction as the polarity of the magnet formed in the cavity, And is a second auxiliary permanent magnet having a width corresponding to the width of the end plate.

Wherein the auxiliary permanent magnet is disposed on a vertical surface of the side surface of the end plate selected from the pair of end plates facing the mold, and a surface having a polarity opposite to the polarity of the magnet formed in the cavity is disposed on a side surface And the third auxiliary permanent magnet is disposed so as to face the first auxiliary permanent magnet.

And the sum of the magnetic flux amount of the auxiliary permanent magnet and the magnetic flux amount of the electromagnet is about 100% to 110% of the end plate magnetic flux amount.

According to the embodiment of the present invention, since the position of the electromagnet disposed around the lower mold to which the magnet is to be formed is improved to prevent the magnetic flux density from being lowered at the center of the molded body, a permanent magnet having a uniform magnetic flux density as a whole is manufactured There is an effect that can be.

Further, since the magnetic flux density is prevented from being lowered at the center of the formed body, a permanent magnet having a long length can be manufactured, and the productivity of the permanent magnet can be improved.

1 is a molding apparatus in which a magnetic field forming process of a general permanent magnet is performed,
2 is a perspective view showing a molding apparatus for a permanent magnet according to an embodiment of the present invention,
3 is a perspective view showing a molding apparatus for a permanent magnet according to another embodiment of the present invention,
4 is a perspective view showing a molding apparatus for a permanent magnet according to another embodiment of the present invention,
5A is a view showing the flow of magnetic flux generated according to the comparative example and the magnetic flux density formed in the molded body,
5B is a view showing the flow of magnetic flux generated according to the embodiment and the magnetic flux density formed in the molded body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

2 is a perspective view showing a molding apparatus for a permanent magnet according to an embodiment of the present invention.

As shown in FIG. 2, the apparatus for molding a permanent magnet according to an embodiment of the present invention includes a mold 100 having a cavity 111 in which magnetization is performed in a longitudinal direction, and a magnet is formed; A coil 220 is wound on an iron core 210 disposed at both ends in the width direction of the mold 100 so as to be parallel to the magnetization direction of the magnet formed in the cavity 111, And includes an electromagnet 200.

The mold 100 includes a lower mold 110 in which a cavity 111 in which a magnet powder is filled is formed and a shape corresponding to the cavity 111 is formed as a means for molding the magnet compact by filling the magnet powder. And an upper mold 120 having a punch 121 formed thereon.

The cavity 111 formed in the lower mold 110 is not limited to a specific formation, and may be formed by variously deforming a shape desired by the user. It is preferable that the upper portion is opened in a shape corresponding to the end face of the punch 121 in order to press the magnet powder filled in the cavity 111 by the punch 121 formed in the upper mold 120 .

Meanwhile, it is preferable that the mold 100 is disposed in a chamber (press facility) capable of maintaining a closed space and maintaining a space in which a forming process is performed in a desired gas atmosphere.

The pair of electromagnets 200 are disposed so as to be parallel to the magnetization direction formed in a magnet to be formed (hereinafter referred to as a " molded body ") as a means for magnetizing the magnet powder formed in the mold 100, So that the magnetic flux density is uniformly formed.

2, each of the pair of electromagnets 200 is formed by winding a coil 220 on an iron core 210. In this case, At this time, the iron core 210 is spaced apart in the width direction of the formed body with the lower mold 110 therebetween so as to be parallel to the magnetization direction of the formed body, and is arranged long in the longitudinal direction (same as the magnetization direction of the formed body). The coil 220 wound around the iron core 210 is formed in a direction in which the circumferential surface of the iron core 210 is spirally wound.

The length of the iron core 210 corresponds to the length of the lower mold 110. It is preferable that the pair of electromagnets 200 are disposed in close contact with the lower mold 110 so that magnetic lines of force are not leaked.

Meanwhile, in the present invention, various means may be added to prevent the magnetic force lines formed by the pair of electromagnets 200 from leaking.

For example, FIG. 3 is a perspective view showing a molding apparatus for a permanent magnet according to another embodiment of the present invention.

As shown in FIG. 3, the permanent magnet molding apparatus according to another embodiment of the present invention may further include a pair of end plates 300 at both ends in the longitudinal direction of the mold 100.

At this time, the pair of end plates 300 are disposed at both ends of the mold 100 in the longitudinal direction, so that magnetic lines of force generated in the electromagnet 200 constitute a closed magnetic circuit. To this end, it is preferable that the end plate 300 has a sufficient size to allow both ends of the mold 100 and the electromagnet 200 to be shielded at the same time.

The pair of end plates 300 is preferably made of an iron-based material so that magnetic lines of force generated by the electromagnet 200 can constitute a closed magnetic circuit. However, it is preferable that the end plate 300 is made of a material such as a magnet that does not form a magnetic field by itself.

The pair of end plates 300 are disposed so as to be perpendicular to the magnetization direction of the molded body formed in the cavity 111 of the lower mold 110 and are disposed in close contact with the ends of the mold 100 and the ends of the electromagnet 200 . Both ends of the lower mold 110 and the electromagnet 200 are connected to each other by an end plate 300 made of an iron material so that the flow of magnetic flux is continued without an air gap.

The end plate 300 preferably has a material with a saturation magnetic flux density of 2T or more and a specific permeability of 1 or more. The larger the value of the saturation magnetic flux density Bs of the end plate 300, the larger the amount of magnetic flux, which is advantageous for aligning the magnet powder. When the specific permeability is greater than 1, the magnetic flux can be induced in a desired direction. At this time, the end plate 300 may have any shape that connects the end of the electromagnet 200 and the lower mold 110, and may be realized as a lower mold.

The height of the end plate 300 should be equal to or higher than the height of the lower mold 110 and higher than the coil sectional area (100%) of the electromagnet 200. If the height of the end plate 300 is lower than that of the lower mold 110, the magnetic flux may not uniformly be applied to the end face of the magnet due to the fringe effect, and the powder may be misaligned. The magnetic flux of the electromagnet 200 may be leaked and must be equal to or larger than the outer diameter of the electromagnet coil 200. [

Because magnetic flux from the magnet 200 is B coil × A coil, end plate 300 is To avoid saturation B coil × A coil ratio of the end plate 300 in the B end × A end and an electromagnet (200) Is better than 100%. Where B coil is the saturation magnetic flux density of the coil 220 and A coil is the cross sectional area of the coil 220 and B end is the saturation magnetic flux density of the end plate 300 and A end is the cross sectional area of the end plate 300 .

Assuming that the magnetic permeability of the electromagnet 200 and the end plate 300 is similar, since the reluctance which is a magnetoresistance is L / uA (length / (permeability x cross sectional area)) and the magnetic flux flows from a place where the reluctance is large to a small place The reluctance length L end and the sectional area A end ratio L end / A end of the end plate 300 may be equal to or less than 100% of the reluctance L coil / A coil of the electromagnet 200. It is preferable that two or more of the electromagnets 200 are used, more preferably 50% or less.

In addition, various means may be added to guide the magnetic flux in the end plate 300 in a predetermined direction.

For example, FIG. 4 is a perspective view illustrating a molding apparatus for a permanent magnet according to another embodiment of the present invention.

4, auxiliary permanent magnets 400a, 400b, and 400c are further disposed on at least one of the side surfaces of the pair of end plates 300 according to another embodiment of the present invention. .

The sum of the magnetic flux amount of the electromagnet 200 and the magnetic flux amount of the auxiliary permanent magnets 400a, 400b and 400c is greater than the saturation magnetization of the end plate 300 So that the permeability becomes equal to the gap and the flow of the magnetic flux is blocked.

At this time, the sum of the magnetic flux amount of the auxiliary permanent magnets 400a, 400b, 400c and the magnetic flux amount of the electromagnet 200 is preferably 100% to 110% of the magnetic flux amount of the end plate 300. If the sum of the magnetic flux amount of the auxiliary permanent magnets 400a, 400b and 400c and the magnetic flux amount of the electromagnet 200 becomes too large, the operating points of the auxiliary permanent magnets 400a, 400b and 400c become low, The magnetic flux density of the magnets 400a, 400b and 400c is lowered and becomes inefficient.

The coercive force of the auxiliary permanent magnets 400a, 400b and 400c is preferably 20 kOe or more. This is because the magnetic flux of the end plate 300 can potentiate the auxiliary permanent magnets 400a, 400b and 400c. For example, if the magnetic flux density 2T of the end plate 300 is all applied to the auxiliary permanent magnets 400a, 400b and 400c, it is preferable that the auxiliary permanent magnets have a coercive force higher than the magnetic flux density of the end plates.

At this time, the auxiliary permanent magnets may be disposed on the side of the end plate in various manners (first to fourth auxiliary permanent magnets 400a to 400c to be described later).

First, the first auxiliary permanent magnet 400a is disposed on a side of the end plate 300 selected from the pair of end plates 300 on the opposite side of the surface facing the lower mold 110. At this time, the first auxiliary permanent magnet 400a preferably has a width corresponding to the width of the cavity 111 of the lower mold 110. Further, the first auxiliary permanent magnet 400a should be disposed in the same polarity as the polarity of the magnet (molded body) formed in the cavity 111. [

For example, the first auxiliary permanent magnet 400a (see FIG. 4) is attached to the end plate 300 which is magnetized to the N pole on the left side of the molded body, magnetized to the S pole on the right side of the molded body, The S pole of the first auxiliary permanent magnet 400a should be disposed so as to face the end plate 300. In other words,

4, the first auxiliary permanent magnet 400a is disposed on the end plate 300 disposed on the left side of the lower mold 110. However, the present invention is not limited thereto, and the end plate 300 disposed on the right side of the lower mold 110, Or may be disposed on both of the pair of end plates 300.

The second auxiliary permanent magnet 400b is disposed on the opposite side of the side surface of the end plate 300 selected from the end plate 300 facing the lower mold 110 in the same manner as the first auxiliary permanent magnet 400a. Plane. However, it is preferable that the second auxiliary permanent magnet 400b has a width corresponding to the width of the end plate 300. Similarly, the second auxiliary permanent magnet 400b should be arranged in the same polarity as the polarity of the magnet (molded body) formed in the cavity 111. [

4, the left side of the molded body is magnetized to the N pole, the right side of the molded body is magnetized to the S pole, and the second auxiliary permanent magnet 400b (not shown) is attached to the end plate 300 disposed on the right side of the lower mold 110 , The N pole of the second auxiliary permanent magnet 400b should be disposed so as to face the end plate 300. [

4, the second auxiliary permanent magnet 400b is disposed on the end plate 300 disposed on the right side of the lower mold 110. However, the present invention is not limited thereto, and the end plate 300 disposed on the left side of the lower mold 110, Or may be disposed on both of the pair of end plates 300.

Next, the third auxiliary permanent magnet 400c is disposed on a vertical surface of the side surface of the end plate 300 selected from the pair of end plates 300, the surface facing the lower mold 110. [ At this time, the third auxiliary permanent magnet 400c should be disposed such that the surface of the third auxiliary permanent magnet 400c opposite to the polarity of the magnet formed in the cavity 111 faces the side surface of the end plate 300.

For example, the third auxiliary permanent magnet 400c (not shown) is attached to the end plate 300, which is magnetized to the N pole on the left side of the molded body and magnetized to the S pole on the right side of the molded body, , The N pole of the third auxiliary permanent magnet 400c should be arranged so as to face the end plate 300. In this case,

4, the third auxiliary permanent magnet 400c is disposed on the end plate 300 disposed on the right side of the lower mold 110. However, the present invention is not limited thereto, and the end plate 300 disposed on the left side of the lower mold 110, Or may be disposed on both of the pair of end plates 300.

The first to third auxiliary permanent magnets 400a to 400c may be used alone or in combination of two or more auxiliary permanent magnets 400a, 400b, and 400c to form a pair of end plates 300, As shown in FIG.

Next, the comparative example and the example are compared.

FIG. 5A is a view showing the flow of magnetic flux generated according to the comparative example and the magnetic flux density formed on the formed body, and FIG. 5B is a view showing the flow of magnetic flux generated according to the embodiment and the magnetic flux density formed on the formed body.

The comparative example is a permanent magnet molding apparatus according to Fig. 1, and a method of manufacturing a magnet according to a comparative example is as follows.

1) A press filled with gas (He or N 2 or Ar) is prepared, and the lower mold 11 is prepared inside the press.

2) An electromagnet 20 to apply a magnetic field in a line to both sides of the lower mold 11 in the magnetization direction, that is, the magnetization direction (N pole-S pole direction) of the molded body is located.

3) The lower mold 11 and the electromagnets 20 at both ends are brought into contact with each other so as to eliminate the air gap therebetween to smooth the flow of the magnetic flux.

4) Put the Nd-Fe-B alloy powder into the lower mold 11 and close the lower mold 11 with the upper mold 12.

5) A magnetic field of about 2T is applied to the electromagnets 20 at both ends and a pressure is applied to the upper punch 12a to perform molding.

6) Since the formed body acts as an air gap, the magnetic flux applied by the electromagnet 20 leaks and the magnetic flux density becomes lower as the molded body becomes thicker. Therefore, the molded body is molded to have a thickness of 50 mm or less. For example, when the molded body of the lower mold 11 is designed to have a thickness of 70 mm, the magnetic flux density at the center of the molded body is lowered to 50% or less (1T or less), which is insufficient for the anisotropy of the Nd-Fe-B alloy powder have.

7) Molded to a thickness of 50mm or less, sintered and heat-treated, cut vertically in the thickness direction of the formed body to make a single piece of magnet. (The thickness direction of the molded body and the thickness direction of the single magnet are the same.)

5A, when the magnetic flux density at both ends is 100% based on the magnetization direction of the molded body, the magnetic flux density formed by the electromagnet when the magnet is manufactured using the conventional permanent magnet molding apparatus as described above, And the center portion of the sample was reduced to about 60%. Therefore, when the conventional permanent magnet forming apparatus is used, the magnetic flux density of the molding agent is not uniform along the longitudinal direction.

Next, an embodiment is a permanent magnet molding apparatus according to Fig. 3, wherein a method of manufacturing a magnet according to an embodiment is as follows.

1) A press filled with gas (He or N 2 or Ar) is prepared and the lower mold 110 is prepared inside the press.

2) An electromagnet 200 for applying a magnetic field is positioned parallel to the magnetization direction of the lower mold 110, that is, at both ends in the width direction of the lower mold 110.

3) Both ends of the lower mold 110 and the electromagnet 200 are connected by an end plate 300 made of an iron material so that the flow of the magnetic flux is continued without an air gap.

4) Put the Nd-Fe-B alloy powder in the lower mold 110 and close the lower mold 110 with the upper mold 120.

5) A magnetic field of about 2T is applied to the electromagnet 200, and at the same time, the upper punch 120 is pressurized and molded.

6) After the sintering and heat treatment process, the molded body is cut vertically in the thickness direction of the body to produce a single piece of magnet. (The thickness direction of the molded body is the same as the thickness direction of the magnet itself.)

As described above, the magnetic flux density formed by the electromagnet when the magnet is manufactured using the permanent magnet molding apparatus according to the present invention has a magnetic flux density at both ends based on the magnetization direction of the molded body as shown in FIG. 5B as 100% It can be seen that the center of the formed body is maintained at about 80% or more. Therefore, when the permanent magnet molding apparatus according to the present invention is used, the magnetic flux density of the molding agent is relatively uniform along the length direction.

Accordingly, even when the molded body of the lower mold is designed to have a thickness of 70 mm, the magnetic flux density at the center of the molded body can be predicted to be greater than 80% of the applied magnetic field at the end plate, .

In addition, even if the molded body of the lower mold is designed to have a thickness of 80 mm, the magnetic flux density at the central portion of the molded body can be maintained at 70% or more of the applied magnetic field, so that a thick molded body can be manufactured.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

100: mold 110: lower mold
111: cavity 120: upper mold
121: Punch section 200: Electromagnet
210: iron core 220: coil
300: end plate 400a: first permanent magnet
400b: second permanent magnet 400c: third permanent magnet

Claims (10)

A mold having a cavity in which a magnet is formed while being magnetized in a longitudinal direction;
And a pair of electromagnets for magnetizing the formed magnet by winding a coil on an iron core disposed at both ends in the width direction of the mold so as to be parallel to the magnetization direction of the magnet formed in the cavity.
The method according to claim 1,
Further comprising a pair of end plates disposed at both ends in a longitudinal direction of the mold so as to be perpendicular to a magnetization direction of the magnet formed in the cavity, the magnetic lines of force generated in the electromagnet being constituted by a closed magnetic circuit.
The method of claim 2,
Wherein the pair of end plates are disposed so as to block both ends of the mold and the electromagnet at the same time.
The method of claim 2,
Wherein the end plate is an iron-based material having a saturation magnetic flux density of 2T or more and a specific magnetic permeability of 1 or more.
The method of claim 2,
Wherein the B end A end of the end plate (300) and the B coil A coil ratio of the electromagnet are 100% or more.
Where B coil is the saturation magnetic flux density of the coil , A coil is the cross sectional area of the coil, B end is the saturation magnetic flux density of the end plate 300, and A end is the cross sectional area of the end plate 300.
The method of claim 2,
And an auxiliary permanent magnet is further disposed on at least one of the side surfaces of the pair of end plates.
The method of claim 6,
Wherein the auxiliary permanent magnet is disposed on a side surface of a selected end plate of the pair of end plates opposite to a surface facing the mold and arranged in a polarity in the same direction as the polarity of the magnet formed in the cavity, Wherein the first auxiliary permanent magnet is a first auxiliary permanent magnet having a width corresponding to a cavity width of the mold.
The method of claim 6,
Wherein the auxiliary permanent magnet is disposed on a side surface of a selected end plate of the pair of end plates opposite to a surface facing the mold and arranged in a polarity in the same direction as the polarity of the magnet formed in the cavity, Wherein the first auxiliary permanent magnet is a second auxiliary permanent magnet having a width corresponding to a width of the end plate.
The method of claim 6,
Wherein the auxiliary permanent magnet is disposed on a vertical surface of the side surface of the end plate selected from the pair of end plates facing the mold, and a surface having a polarity opposite to the polarity of the magnet formed in the cavity is disposed on a side surface Is a third auxiliary permanent magnet disposed so as to face the first permanent magnet.
The method of claim 6,
Wherein the sum of the magnetic flux amount of the auxiliary permanent magnet and the magnetic flux amount of the electromagnet is about 100% to 110% of the end plate magnetic flux amount.
KR1020150142903A 2015-10-13 2015-10-13 Permanent magnet forming device KR101745151B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102001644B1 (en) * 2018-02-09 2019-07-18 계명대학교 산학협력단 A magnetic press device using halbach cylinder structure and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102001644B1 (en) * 2018-02-09 2019-07-18 계명대학교 산학협력단 A magnetic press device using halbach cylinder structure and control method thereof

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