JP2008172977A - Cylindrical-magnet manufacturing method and cylindrical-magnet manufacturing device - Google Patents

Cylindrical-magnet manufacturing method and cylindrical-magnet manufacturing device Download PDF

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JP2008172977A
JP2008172977A JP2007006069A JP2007006069A JP2008172977A JP 2008172977 A JP2008172977 A JP 2008172977A JP 2007006069 A JP2007006069 A JP 2007006069A JP 2007006069 A JP2007006069 A JP 2007006069A JP 2008172977 A JP2008172977 A JP 2008172977A
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cylindrical
mold
magnet
iron core
die
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Noboru Niiguchi
昇 新口
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Jtekt Corp
株式会社ジェイテクト
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<P>PROBLEM TO BE SOLVED: To provide a cylindrical-magnet manufacturing device for manufacturing a cylindrical magnet, in which the crystal direction of magnet powder is well-aligned and a remaining magnetic flux density value for each position on the peripheral face is substantially constant. <P>SOLUTION: The cylindrical-magnet manufacturing device is provided with a columnar iron core 5, a die 4 having a hole into which the iron core 5 is fitted loosely, and electromagnets 3, 3 that are in contact with the die 4 so as to form an oriented magnetic field in the direction parallel to the end face of the iron core 5 through the die 4. Magnet powder 6 is poured into a cylindrical air-gap in between the hole of the die 4 and the iron core 5; the poured magnet powder 6 is pressed, from both end parts of the air-gap so as to form a cylindrical magnet; the die 4 has a cylindrical shape concentric with the iron core 5; each face of the electromagnets 3, 3 contacting with the die 4 has a peripheral-face shape along the outer peripheral face of the die 4; and the device is also provided with a rotating means 7 that makes the die 4 rotate in the circumferential direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、円柱形状の鉄心を遊嵌した金型の穴の円筒形状の空隙に磁石粉を注入し、注入した磁石粉に対して、金型に接する電磁石により配向磁界を形成しながら、磁石粉を空隙の両端部から押圧して円筒磁石を形成する円筒磁石の製造方法及び円筒磁石の製造装置に関するものである。   The present invention injects magnet powder into a cylindrical gap in a mold hole loosely fitted with a cylindrical iron core, and forms an orientation magnetic field for the injected magnet powder by an electromagnet in contact with the mold. The present invention relates to a cylindrical magnet manufacturing method and a cylindrical magnet manufacturing apparatus that form powder by pressing powder from both ends of a gap.
希土類焼結ラジアル異方性の円筒磁石を製造する場合、磁石粉を円筒形状の金型に注入し、磁石粉の結晶方向を磁界中で揃える配向と称される作業を行った後、磁石粉を押圧して円筒形状に成形し、焼結した後、着磁する。磁石粉の結晶方向が、着磁の方向を決定するので、円筒形状に成形する工程では、結晶方向の乱れを最小限に抑制することが、磁石の高性能化の為に必要である。   When manufacturing cylindrical magnets with rare earth sintered radial anisotropy, magnet powder is injected into a cylindrical mold, and after performing an operation called orientation to align the crystal direction of the magnet powder in a magnetic field, Is pressed into a cylindrical shape, sintered, and then magnetized. Since the crystal direction of the magnet powder determines the magnetizing direction, it is necessary for minimizing the disorder of the crystal direction in order to improve the performance of the magnet in the process of forming into a cylindrical shape.
希土類焼結ラジアル異方性の円筒磁石を製造する方法の1つとして、特許文献1に開示された方法がある。特許文献1に開示された方法は、金型キャビティ内に充填した磁石粉を、水平磁場垂直成形法により配向磁界を印加して成形することにより、ラジアル異方性磁石を製造する方法であり、磁場印加中、磁石粉を金型周方向に所定角度回転させる方法、磁場印加後、磁石粉を金型周方向に所定角度回転させ、その後再び磁場を印加する方法、磁場印加中、磁場発生コイルを磁石粉に対し金型周方向に所定角度回転させる方法、磁場印加後、磁場発生コイルを磁石粉に対し金型周方向に所定角度回転させ、その後再び磁場を印加する方法、及び磁場発生コイルを2対以上配置し、1対のコイルが磁場を印加した後、別のコイル対が磁場を印加する方法である。
特開2004−153867号公報
One method for producing a rare earth sintered radial anisotropic cylindrical magnet is disclosed in Patent Document 1. The method disclosed in Patent Document 1 is a method of manufacturing a radial anisotropic magnet by forming magnet powder filled in a mold cavity by applying an orientation magnetic field by a horizontal magnetic field vertical molding method, A method of rotating magnet powder by a predetermined angle in the circumferential direction of the mold while applying a magnetic field, a method of rotating magnet powder by a predetermined angle in the circumferential direction of the mold after applying a magnetic field, and then applying a magnetic field again. Of rotating a magnetic field generating coil at a predetermined angle in the circumferential direction of the mold, applying a magnetic field, rotating the magnetic field generating coil at a predetermined angle in the circumferential direction of the mold with respect to the magnetic powder, and then applying the magnetic field again, and the magnetic field generating coil Two or more pairs are arranged, and after one pair of coils applies a magnetic field, another pair of coils applies a magnetic field.
JP 2004-153867 A
上述した方法で製造された円筒磁石は、金型キャビティ内に充填した磁石粉と磁場発生コイルとの相対角度を所定角度回転させる前後に、配向磁場(配向磁界)を印加するので、配向磁場の向きが径方向に揃わない箇所が発生し、磁石粉の結晶方向の揃い方が不足し、円筒磁石の周面上の位置毎に残留磁束密度値が異なる。その為、この円筒磁石をロータに用いたモータは、トルク脈動が大きいが、一般的な産業用モータでは問題にならないレベルである。しかし、非常に低コギングトルクであることを要求される電動パワーステアリング用モータでは、残留磁束密度値のばらつきにより発生するコギングトルクが操舵フィーリングに悪影響を及ぼすという問題がある。   The cylindrical magnet manufactured by the method described above applies an orientation magnetic field (orientation magnetic field) before and after rotating the relative angle between the magnet powder filled in the mold cavity and the magnetic field generating coil by a predetermined angle. Locations where the directions are not aligned in the radial direction occur, the alignment of the magnet powder in the crystal direction is insufficient, and the residual magnetic flux density value differs for each position on the peripheral surface of the cylindrical magnet. Therefore, a motor using this cylindrical magnet as a rotor has a large torque pulsation, but it is at a level that does not cause a problem in a general industrial motor. However, in an electric power steering motor that is required to have very low cogging torque, there is a problem that cogging torque generated due to variations in residual magnetic flux density values adversely affects steering feeling.
本発明は、上述したような事情に鑑みてなされたものであり、第1発明では、磁石粉の結晶方向がよく揃い、周面上の位置毎の残留磁束密度値が略一定である円筒磁石を製造できる円筒磁石の製造方法を提供することを目的とする。
第2、3発明では、磁石粉の結晶方向がよく揃い、周面上の位置毎の残留磁束密度値が略一定である円筒磁石を製造できる円筒磁石の製造装置を提供することを目的とする。
The present invention has been made in view of the above-described circumstances. In the first invention, a cylindrical magnet in which the crystal directions of magnet powder are well aligned and the residual magnetic flux density value at each position on the circumferential surface is substantially constant. It aims at providing the manufacturing method of the cylindrical magnet which can manufacture.
In the second and third inventions, an object of the present invention is to provide a cylindrical magnet manufacturing apparatus capable of manufacturing a cylindrical magnet in which the crystal directions of magnet powder are well aligned and the residual magnetic flux density value at each position on the peripheral surface is substantially constant. .
第1発明に係る円筒磁石の製造方法は、円柱形状の鉄心と、該鉄心を遊嵌する穴を有する金型と、該金型に接し該金型を通じて前記鉄心の端面と平行な方向の配向磁界を形成する電磁石とを用意し、前記穴及び鉄心間の円筒形状の空隙に磁石粉を注入し、注入した磁石粉を前記空隙の両端部から押圧して円筒磁石を形成する円筒磁石の製造方法において、前記鉄心と同心の円筒形状である前記金型と、該金型と接する面が該金型の外周面に沿った周面形状である前記電磁石と、前記金型を周方向へ回転させる回転手段を用意し、前記配向磁界を形成した状態で、前記回転手段により前記金型を1又は複数回回転させた後、前記配向磁界を形成しながら、前記磁石粉を前記空隙の両端部から押圧することを特徴とする。   A cylindrical magnet manufacturing method according to a first aspect of the present invention includes a columnar iron core, a mold having a hole for loosely fitting the iron core, and an orientation in a direction parallel to the end face of the iron core through the mold in contact with the mold. An electromagnet for forming a magnetic field is prepared, magnet powder is injected into a cylindrical gap between the hole and the iron core, and the injected magnet powder is pressed from both ends of the gap to form a cylindrical magnet. In the method, the mold having a cylindrical shape concentric with the iron core, the electromagnet whose surface contacting the mold has a circumferential shape along the outer peripheral surface of the mold, and rotating the mold in the circumferential direction In the state where the rotating means is prepared and the orientation magnetic field is formed, the mold is rotated one or more times by the rotating means, and then the magnet powder is formed at both ends of the gap while forming the orientation magnetic field. It is characterized by pressing from.
第2発明に係る円筒磁石の製造装置は、円柱形状の鉄心と、該鉄心を遊嵌する穴を有する金型と、該金型に接し該金型を通じて前記鉄心の端面と平行な方向の配向磁界を形成する電磁石とを備え、前記穴及び鉄心間の円筒形状の空隙に磁石粉を注入し、注入した磁石粉を前記空隙の両端部から押圧して円筒磁石を形成する円筒磁石の製造装置において、前記金型は前記鉄心と同心の円筒形状であり、前記電磁石の金型と接する面は、該金型の外周面に沿った周面形状であり、前記金型を周方向へ回転させる回転手段を備えることを特徴とする。   A cylindrical magnet manufacturing apparatus according to a second aspect of the present invention includes a columnar iron core, a mold having a hole for loosely fitting the iron core, and an orientation in a direction parallel to the end face of the iron core through the mold and in contact with the mold An apparatus for producing a cylindrical magnet comprising an electromagnet that forms a magnetic field, injecting magnet powder into a cylindrical gap between the hole and the iron core, and pressing the injected magnet powder from both ends of the gap The mold has a cylindrical shape concentric with the iron core, and the surface of the electromagnet in contact with the mold has a circumferential shape along the outer peripheral surface of the mold, and the mold is rotated in the circumferential direction. Rotating means is provided.
第3発明に係る円筒磁石の製造装置は、前記回転手段は、電動モータであり、該電動モータの回転軸に設けられた歯車が、前記金型の外周面に設けられた歯車と噛合するように構成されていることを特徴とする。   In the cylindrical magnet manufacturing apparatus according to a third aspect of the present invention, the rotating means is an electric motor, and a gear provided on a rotating shaft of the electric motor meshes with a gear provided on an outer peripheral surface of the mold. It is comprised by these.
第1発明に係る円筒磁石の製造方法によれば、金型が鉄心と同心の円筒形状であり、電磁石の金型と接する面が金型の外周面に沿った周面形状であり、配向磁界を形成した状態で、回転手段により金型を1又は複数回回転させた後、配向磁界を形成しながら、磁石粉を空隙の両端部から押圧するので、磁石粉の結晶方向がよく揃い、周面上の位置毎の残留磁束密度値が略一定である円筒磁石を製造することが可能である。   According to the method for manufacturing a cylindrical magnet according to the first aspect of the present invention, the mold has a cylindrical shape concentric with the iron core, the surface of the electromagnet in contact with the mold has a circumferential shape along the outer peripheral surface of the mold, and the orientation magnetic field In this state, the magnet powder is pressed from both ends of the air gap while forming the orientation magnetic field after rotating the mold one or more times by the rotating means. It is possible to manufacture a cylindrical magnet having a substantially constant residual magnetic flux density value for each position on the surface.
第2、3発明に係る円筒磁石の製造装置によれば、金型は鉄心と同心の円筒形状であり、電磁石の金型と接する面は、金型の外周面に沿った周面形状であり、回転手段が、金型を周方向へ回転させるので、磁石粉の結晶方向がよく揃い、周面上の位置毎の残留磁束密度値が略一定である円筒磁石を製造することが可能である。   According to the cylindrical magnet manufacturing apparatus according to the second and third inventions, the mold has a cylindrical shape concentric with the iron core, and the surface of the electromagnet in contact with the mold has a circumferential shape along the outer peripheral surface of the mold. Since the rotating means rotates the mold in the circumferential direction, it is possible to produce a cylindrical magnet in which the crystal directions of the magnet powder are well aligned and the residual magnetic flux density value at each position on the circumferential surface is substantially constant. .
以下に、本発明を、その実施の形態を示す図面を参照しながら説明する。
図1は、本発明に係る円筒磁石の製造方法及び円筒磁石の製造装置の実施の形態の模式的な外観を示す斜視図である。この円筒磁石の製造装置は、ロの字型の支持部材1の対向する各短辺に、板形状の鉄心にコイル2が巻回された電磁石3,3がそれぞれ支持され、電磁石3,3の互いに対向する面は、円筒形状のダイス4(金型)の周面にそれぞれ接するように、半円の周面に形成されている。
円筒形状のダイス4には、円柱形状の鉄心5が同心に遊嵌され、ダイス4の底部で固定されている。ダイス4及び鉄心5間の空隙には、磁石粉6が注入される。電磁石3,3は、鉄心5の端面と平行な方向の配向磁界を形成する。
Hereinafter, the present invention will be described with reference to the drawings showing embodiments thereof.
FIG. 1 is a perspective view showing a schematic appearance of an embodiment of a cylindrical magnet manufacturing method and a cylindrical magnet manufacturing apparatus according to the present invention. In this cylindrical magnet manufacturing apparatus, electromagnets 3 and 3 in which a coil 2 is wound around a plate-shaped iron core are respectively supported on opposing short sides of a square-shaped support member 1. The surfaces facing each other are formed on a semicircular circumferential surface so as to be in contact with the circumferential surface of the cylindrical die 4 (die).
A cylindrical iron core 5 is loosely fitted concentrically on the cylindrical die 4 and fixed at the bottom of the die 4. Magnet powder 6 is injected into the gap between the die 4 and the iron core 5. The electromagnets 3 and 3 form an orientation magnetic field in a direction parallel to the end face of the iron core 5.
図2は、ダイス4を拡大して示す平面図(a)及び断面図(b)である。ダイス4は、底面に隣接する外周面に歯車9が設けられており、歯車9は、図示しない支持部材に固定されたサーボモータ7(回転手段)の駆動軸に設けられた歯車8と噛合している。これにより、ダイス4は、電磁石3に囲繞された状態で、サーボモータ7の回転方向及び回転速度に応じて、周方向へ回転する。   FIG. 2 is a plan view (a) and a cross-sectional view (b) showing the dice 4 in an enlarged manner. The die 4 is provided with a gear 9 on the outer peripheral surface adjacent to the bottom surface, and the gear 9 meshes with a gear 8 provided on a drive shaft of a servo motor 7 (rotating means) fixed to a support member (not shown). ing. Thereby, the die 4 is rotated in the circumferential direction according to the rotation direction and the rotation speed of the servo motor 7 while being surrounded by the electromagnet 3.
このような構成の円筒磁石の製造装置では、先ず、ダイス4及び鉄心5間の円筒形状の空隙に、磁石粉6を注入する。
次に、注入した磁石粉6に対して、電磁石3,3が、鉄心5の端面と平行な方向の配向磁界を形成し、この状態でサーボモータ7がダイス4を1回又は複数回、磁石粉6の結晶方向が揃う程度の速度で回転させる。
次に、電磁石3,3が引続き配向磁界を形成している状態で、図示しない押圧部材で、円筒形状の空隙の両端部から磁石粉6を押圧して、図3に示すような円筒形状に圧縮成形する。
In the cylindrical magnet manufacturing apparatus having such a configuration, first, magnet powder 6 is injected into a cylindrical gap between the die 4 and the iron core 5.
Next, the electromagnets 3 and 3 form an orientation magnetic field in a direction parallel to the end face of the iron core 5 with respect to the injected magnet powder 6, and in this state, the servomotor 7 moves the die 4 once or a plurality of times. The powder 6 is rotated at such a speed that the crystal directions of the powder 6 are aligned.
Next, in a state where the electromagnets 3 and 3 continue to form an orientation magnetic field, the magnet powder 6 is pressed from both ends of the cylindrical gap with a pressing member (not shown) to form a cylindrical shape as shown in FIG. Compression molding.
磁石粉6が圧縮成形された図3に示す円筒形状の磁性体10は、磁石粉の結晶方向が揃っており、径方向の配向ベクトルは、図4に示すように、周面上で略一様となるので、周面上の残留磁束密度値も略一定となる。
円筒形状に成形された磁性体10は、図示しない着磁器により、必要とされる形態に着磁され、円筒磁石となる。
The cylindrical magnetic body 10 shown in FIG. 3 in which the magnet powder 6 is compression-molded has a uniform crystal direction of the magnet powder, and the radial orientation vector is substantially equal on the circumferential surface as shown in FIG. Therefore, the residual magnetic flux density value on the peripheral surface is also substantially constant.
The magnetic body 10 formed into a cylindrical shape is magnetized in a required form by a magnetizer (not shown) to become a cylindrical magnet.
本発明に係る円筒磁石の製造方法及び円筒磁石の製造装置の実施の形態の模式的な外観を示す斜視図である。It is a perspective view which shows the typical external appearance of embodiment of the manufacturing method of the cylindrical magnet which concerns on this invention, and the manufacturing apparatus of a cylindrical magnet. ダイスを拡大して示す平面図(a)及び断面図(b)である。It is the top view (a) and sectional view (b) which expand and show a dice. 磁石粉が圧縮成形された円筒形状の磁性体を示す斜視図である。It is a perspective view which shows the cylindrical magnetic body by which magnet powder was compression-molded. 図3に示す磁性体の径方向の配向ベクトルを示す説明図である。It is explanatory drawing which shows the orientation vector of the radial direction of the magnetic body shown in FIG.
符号の説明Explanation of symbols
1 支持部材
2 コイル
3 電磁石
4 ダイス(金型)
5 鉄心
6 磁石粉
7 サーボモータ(回転手段)
8,9 歯車(回転手段)
DESCRIPTION OF SYMBOLS 1 Support member 2 Coil 3 Electromagnet 4 Dice (mold)
5 Iron core 6 Magnet powder 7 Servo motor (rotating means)
8,9 Gear (Rotating means)

Claims (3)

  1. 円柱形状の鉄心と、該鉄心を遊嵌する穴を有する金型と、該金型に接し該金型を通じて前記鉄心の端面と平行な方向の配向磁界を形成する電磁石とを用意し、前記穴及び鉄心間の円筒形状の空隙に磁石粉を注入し、注入した磁石粉を前記空隙の両端部から押圧して円筒磁石を形成する円筒磁石の製造方法において、
    前記鉄心と同心の円筒形状である前記金型と、該金型と接する面が該金型の外周面に沿った周面形状である前記電磁石と、前記金型を周方向へ回転させる回転手段を用意し、前記配向磁界を形成した状態で、前記回転手段により前記金型を1又は複数回回転させた後、前記配向磁界を形成しながら、前記磁石粉を前記空隙の両端部から押圧することを特徴とする円筒磁石の製造方法。
    A cylindrical iron core, a mold having a hole for loosely fitting the iron core, and an electromagnet in contact with the mold and forming an orientation magnetic field in a direction parallel to the end surface of the iron core through the mold, the hole And injecting the magnet powder into the cylindrical gap between the iron cores and pressing the injected magnet powder from both ends of the gap to form a cylindrical magnet,
    The mold having a cylindrical shape concentric with the iron core, the electromagnet having a peripheral surface shape along the outer peripheral surface of the mold, and a rotating means for rotating the mold in the circumferential direction. In the state where the orientation magnetic field is formed, the mold is rotated one or more times by the rotating means, and then the magnet powder is pressed from both ends of the gap while forming the orientation magnetic field. A method of manufacturing a cylindrical magnet.
  2. 円柱形状の鉄心と、該鉄心を遊嵌する穴を有する金型と、該金型に接し該金型を通じて前記鉄心の端面と平行な方向の配向磁界を形成する電磁石とを備え、前記穴及び鉄心間の円筒形状の空隙に磁石粉を注入し、注入した磁石粉を前記空隙の両端部から押圧して円筒磁石を形成する円筒磁石の製造装置において、
    前記金型は前記鉄心と同心の円筒形状であり、前記電磁石の金型と接する面は、該金型の外周面に沿った周面形状であり、前記金型を周方向へ回転させる回転手段を備えることを特徴とする円筒磁石の製造装置。
    A cylindrical iron core, a mold having a hole for loosely fitting the iron core, and an electromagnet in contact with the mold and forming an orientation magnetic field in a direction parallel to the end surface of the iron core through the mold, the hole and In a cylindrical magnet manufacturing apparatus for injecting magnet powder into a cylindrical gap between iron cores and pressing the injected magnet powder from both ends of the gap to form a cylindrical magnet,
    The mold has a cylindrical shape concentric with the iron core, and the surface of the electromagnet in contact with the mold has a circumferential shape along the outer peripheral surface of the mold, and the rotating means rotates the mold in the circumferential direction. An apparatus for producing a cylindrical magnet, comprising:
  3. 前記回転手段は、電動モータであり、該電動モータの回転軸に設けられた歯車が、前記金型の外周面に設けられた歯車と噛合するように構成されている請求項2記載の円筒磁石の製造装置。   The cylindrical magnet according to claim 2, wherein the rotating means is an electric motor, and a gear provided on a rotating shaft of the electric motor is configured to mesh with a gear provided on an outer peripheral surface of the mold. Manufacturing equipment.
JP2007006069A 2007-01-15 2007-01-15 Cylindrical-magnet manufacturing method and cylindrical-magnet manufacturing device Pending JP2008172977A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100244608A1 (en) * 2007-12-06 2010-09-30 Toyota Jidosha Kabushiki Kaisha Permanent magnet, manufacturing method thereof, and rotor and ipm motor
CN101958179A (en) * 2010-09-14 2011-01-26 保定天威集团有限公司 Method for mechanically binding and manually binding big transformer iron core
CN104282430A (en) * 2013-07-05 2015-01-14 大同特殊钢株式会社 Permanent magnet manufacturing method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100244608A1 (en) * 2007-12-06 2010-09-30 Toyota Jidosha Kabushiki Kaisha Permanent magnet, manufacturing method thereof, and rotor and ipm motor
US8497613B2 (en) * 2007-12-06 2013-07-30 Toyota Jidosha Kabushiki Kaisha Permanent magnet, manufacturing method thereof, and rotor and IPM motor
CN101958179A (en) * 2010-09-14 2011-01-26 保定天威集团有限公司 Method for mechanically binding and manually binding big transformer iron core
CN104282430A (en) * 2013-07-05 2015-01-14 大同特殊钢株式会社 Permanent magnet manufacturing method
CN104282430B (en) * 2013-07-05 2017-09-12 大同特殊钢株式会社 The manufacture method of permanent magnet

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