JPH11113224A - Magnetizing method of permanent magnet type eddy current reducer - Google Patents
Magnetizing method of permanent magnet type eddy current reducerInfo
- Publication number
- JPH11113224A JPH11113224A JP28304497A JP28304497A JPH11113224A JP H11113224 A JPH11113224 A JP H11113224A JP 28304497 A JP28304497 A JP 28304497A JP 28304497 A JP28304497 A JP 28304497A JP H11113224 A JPH11113224 A JP H11113224A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- magnetizing
- support ring
- eddy current
- magnet support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は大型貨物車両などに
搭載される永久磁石式渦電流減速装置、特に渦電流減速
装置の組立て後に永久磁石を磁石化する、永久磁石式渦
電流減速装置の着磁方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type eddy current reduction device mounted on a large cargo vehicle or the like, and more particularly, to a permanent magnet type eddy current reduction device which magnetizes a permanent magnet after assembling the eddy current reduction device. It concerns the magnetic method.
【0002】[0002]
【従来の技術】永久磁石(以下これを単に磁石という)
を使用した渦電流減速装置では、磁性体からなる磁石支
持環(継鉄)の外周面に、偶数個(8〜24極)の磁石
を外面の磁極が周方向に交互に異なるように、接着剤、
取付金具(アルミニウム、ステンレス、合成樹脂などの
非磁性材)などにより取り付けられている。磁石を着磁
する時は、予め磁石を1個ずつ着磁するかまたは全部を
同時に着磁してから磁石支持環に取り付けるか、着磁し
てない全部の磁石(厳密には希土類金属などの磁石材)
を磁石支持環に接着剤、取付金具などにより取り付けて
から、数個ずつ着磁するかまたは全部を同時に着磁して
いた。2. Description of the Related Art Permanent magnets (hereinafter simply referred to as magnets)
In an eddy current reduction device using a magnet, an even number (8 to 24 poles) of magnets are bonded to the outer peripheral surface of a magnet support ring (yoke) made of a magnetic material such that the magnetic poles on the outer surface are alternately different in the circumferential direction. Agent,
It is attached by a mounting bracket (a non-magnetic material such as aluminum, stainless steel, or synthetic resin). When magnetizing magnets, magnetize magnets one by one in advance, or magnetize them all at the same time, and then attach them to the magnet support ring, or use magnets that are not magnetized (strictly, rare earth metals, etc.). Magnet material)
Was attached to the magnet support ring with an adhesive, a mounting bracket, or the like, and then several or all were magnetized simultaneously.
【0003】しかし、磁石を1個ずつ着磁するのでは手
間が掛かり、例えば全部で12個の磁石を、磁石支持環
の外周面に環状に並べて結合した後に、磁石支持環の外
周側から磁界を付与して同時に着磁するのでは、手間は
省けるものの、多数の強磁性板(ポールピース)を有す
る保護筒ないし案内筒の内部へ該磁石支持環を組み付け
る時、案内筒に対する磁石の強力な吸引力に抗するた
め、剛性の高い強固な組付治具を必要とし、作業者が指
などを怪我しないように細心の注意を要する。However, it takes time to magnetize the magnets one by one. For example, after a total of twelve magnets are annularly arranged on the outer peripheral surface of the magnet support ring and coupled, a magnetic field is applied from the outer peripheral side of the magnet support ring. When the magnet support ring is assembled inside a protective cylinder or a guide cylinder having a large number of ferromagnetic plates (pole pieces), the magnet is strongly attached to the guide cylinder. In order to resist the suction force, a rigid and strong assembling jig is required, and great care must be taken so that the worker does not injure his finger or the like.
【0004】なお、直流回転機のロータの着磁方法とし
て、特開平2-133100号公報に開示されるようなものがあ
るが、この方法を永久磁石式渦電流減速装置の磁石支持
環に適用しても上述の問題は解決できない。As a method of magnetizing a rotor of a DC rotating machine, there is a method disclosed in Japanese Patent Application Laid-Open No. 2-133100. This method is applied to a magnet support ring of a permanent magnet type eddy current reduction device. However, the above problem cannot be solved.
【0005】[0005]
【発明が解決しようとする課題】本発明の課題は上述の
ような磁石支持環を案内筒へ組み付ける手間を省き、強
固な組付治具を不要とするために、磁石を磁石支持環に
結合しかつ案内筒に組み付けた後に着磁するようにした
永久磁石式渦電流減速装置の着磁方法を提供することに
ある。SUMMARY OF THE INVENTION An object of the present invention is to connect a magnet to a magnet support ring in order to eliminate the need for assembling the above-described magnet support ring to the guide cylinder and to eliminate the need for a strong assembling jig. It is another object of the present invention to provide a method of magnetizing a permanent magnet type eddy current reduction device which is magnetized after being assembled to a guide cylinder.
【0006】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明の構成は永久磁石を用いて渦電流による制動
力を発生させる渦電流減速装置において、磁性体からな
る磁石支持環の外周面に着磁前の偶数個の永久磁石を周
方向に所定の間隔を存して結合し、非磁性体からなる薄
肉の案内筒の内部に前記磁石支持環を収容した後、前記
案内筒を介し前記永久磁石に対向する磁極を有する着磁
装置の内部へ配置し、前記着磁装置の磁心の電磁コイル
に直流電流を流して前記磁石支持環の外周側から前記永
久磁石に極性が周方向に交互に異なるように着磁するこ
とを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an eddy current reduction device for generating a braking force by an eddy current using a permanent magnet. An even number of permanent magnets before magnetizing on the surface are joined at predetermined intervals in the circumferential direction, and after accommodating the magnet support ring inside a thin guide tube made of a non-magnetic material, the guide tube is removed. The permanent magnet is disposed inside a magnetizing device having a magnetic pole facing the permanent magnet, and a direct current is applied to an electromagnetic coil of a magnetic core of the magnetizing device so that the polarity is changed from the outer peripheral side of the magnet support ring to the permanent magnet in a circumferential direction. It is characterized by being magnetized so as to be alternately different.
【0007】また、上記課題を解決するために、本発明
の構成は永久磁石を用いて渦電流による制動力を発生さ
せる渦電流減速装置において、磁性体からなる磁石支持
環の外周面に着磁前の偶数個の永久磁石を周方向等間隔
に結合し、非磁性体からなりかつ前記永久磁石と同数の
強磁性板を周方向等間隔に有する案内筒の内部に前記磁
石支持環を収容し、前記案内筒の各強磁性板に前記磁石
支持環の各永久磁石が全面的に重なるように固定した
後、各強磁性板の外面に対向する磁極を有する着磁装置
により前記磁石支持環の外周側から前記永久磁石に極性
が周方向に交互に異なるように着磁することを特徴とす
る。According to another aspect of the present invention, there is provided an eddy current reduction device for generating a braking force due to an eddy current using a permanent magnet, wherein the outer peripheral surface of a magnet support ring made of a magnetic material is magnetized. The magnet support ring is housed inside a guide cylinder made of a non-magnetic material and having the same number of ferromagnetic plates as the permanent magnets at regular intervals in the circumferential direction. After fixing each permanent magnet of the magnet support ring to each ferromagnetic plate of the guide cylinder so as to completely overlap, the magnet support ring of the magnet support ring is provided by a magnetizing device having a magnetic pole facing the outer surface of each ferromagnetic plate. It is characterized in that the permanent magnets are magnetized from the outer peripheral side so that the polarity is alternately different in the circumferential direction.
【0008】また、上記課題を解決するために、本発明
の構成は永久磁石を用いて渦電流による制動力を発生さ
せる渦電流減速装置において、磁性体からなる磁石支持
環の外周面に着磁前の4n(nは自然数)個の永久磁石
を周方向に所定の間隔を存して結合し、非磁性体からな
りかつ2n個の強磁性板を周方向等間隔に有する案内筒
の内部に前記磁石支持環を収容し、前記案内筒の各強磁
性板に前記磁石支持環の2個の永久磁石が全面的に重な
るように固定した後、各強磁性板の外面に対向する磁極
を有する着磁装置により前記磁石支持環の外周側から前
記永久磁石に極性が周方向に交互に異なるように着磁す
ることを特徴とする。According to another aspect of the present invention, there is provided an eddy current reduction device for generating a braking force due to an eddy current using a permanent magnet, wherein the outer peripheral surface of a magnet support ring made of a magnetic material is magnetized. The preceding 4n (n is a natural number) permanent magnets are connected at predetermined intervals in the circumferential direction, and are provided inside a guide cylinder made of non-magnetic material and having 2n ferromagnetic plates at equal intervals in the circumferential direction. After accommodating the magnet support ring and fixing the two permanent magnets of the magnet support ring to each ferromagnetic plate of the guide cylinder so as to completely overlap with each other, the ferromagnetic plate has a magnetic pole facing the outer surface of each ferromagnetic plate. The permanent magnet is magnetized from the outer peripheral side of the magnet support ring so that the polarity is alternately different in a circumferential direction by a magnetizing device.
【0009】さらに、上記課題を解決するために、本発
明の構成は永久磁石を用いて渦電流による制動力を発生
させる渦電流減速装置において、磁性体からなる複数の
磁石支持環の外周面にそれぞれ着磁前の偶数個の永久磁
石を周方向等間隔に結合し、非磁性体からなりかつ前記
永久磁石と同数の強磁性板を周方向等間隔に有する案内
筒の内部に前記複数の磁石支持環を収容し、前記複数の
磁石支持環の各永久磁石が軸方向に並びかつ前記案内筒
の各強磁性板に全面的に重なるように固定した後、各強
磁性板の外面に対向する磁極を有する着磁装置により前
記複数の磁石支持環の外周側から前記永久磁石に極性が
周方向に交互に異なるように着磁することを特徴とす
る。Further, in order to solve the above-mentioned problem, the configuration of the present invention relates to an eddy current reduction device for generating a braking force by an eddy current using a permanent magnet, in an outer peripheral surface of a plurality of magnet support rings made of a magnetic material. An even number of permanent magnets, each before being magnetized, are joined at equal intervals in the circumferential direction, and the plurality of magnets are formed inside a guide cylinder made of a non-magnetic material and having the same number of ferromagnetic plates as the permanent magnets at equal intervals in the circumferential direction. After accommodating a support ring, the permanent magnets of the plurality of magnet support rings are aligned in the axial direction and fixed so as to completely overlap each ferromagnetic plate of the guide cylinder, and then face the outer surface of each ferromagnetic plate. It is characterized in that the permanent magnets are magnetized so that their polarities are alternately different in the circumferential direction from the outer peripheral side of the plurality of magnet support rings by a magnetizing device having magnetic poles.
【0010】[0010]
【発明の実施の形態】本発明では磁石を着磁する前に、
磁石を磁石支持環に結合したうえ案内筒の内部へ組み込
み、次いで着磁装置の内部へ配置する。強磁性板のない
非磁性体の薄板からなる案内筒の場合は、着磁装置の各
磁極を案内筒の外側から各磁石へ対向させ、各磁極の電
磁コイルに直流電流を流して着磁する。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, before magnetizing a magnet,
The magnet is connected to the magnet support ring and assembled inside the guide tube, and then placed inside the magnetizing device. In the case of a guide cylinder made of a non-magnetic thin plate without a ferromagnetic plate, each magnetic pole of the magnetizing device is opposed to each magnet from the outside of the guide cylinder, and a DC current is passed through the electromagnetic coil of each magnetic pole to magnetize. .
【0011】多数の強磁性板を有する案内筒の場合は、
予め各強磁性板に磁石支持環の各磁石が全面的に重なる
ように固定してから、着磁装置の内部へ配置する。着磁
装置の各磁極を案内筒の外側から強磁性板へ対向させ、
各磁心の電磁コイルに直流電流を流して着磁する。多数
の強磁性板を有する案内筒の内部に2つ以上の磁石支持
環が配設される場合は、各強磁性板に各磁石支持環の磁
石が全面的に重なるように固定し、当該磁石が全部同極
性となるように着磁する。上述の案内筒に収容した磁石
支持環について、全部の磁石をまとめて同時に着磁して
も、幾つかの磁石を数回に分けて順次着磁してもよい。In the case of a guide cylinder having many ferromagnetic plates,
Each magnet of the magnet support ring is fixed to each ferromagnetic plate in advance so as to completely overlap with each other, and then placed inside the magnetizing device. Each magnetic pole of the magnetizing device is opposed to the ferromagnetic plate from outside the guide cylinder,
A direct current is passed through the electromagnetic coil of each magnetic core for magnetization. When two or more magnet support rings are provided inside a guide cylinder having a large number of ferromagnetic plates, the magnets of the respective magnet support rings are fixed to each ferromagnetic plate so as to completely overlap, Are magnetized to have the same polarity. Regarding the magnet support ring housed in the above-described guide cylinder, all magnets may be magnetized at the same time, or some magnets may be magnetized several times and sequentially magnetized.
【0012】磁石支持環の磁石に着磁した後には、周方
向に隣接する2つの磁石が案内筒の各強磁性板に部分的
に重なるように磁石支持環を回動し、着磁装置から案内
筒を引き出す。After magnetizing the magnets of the magnet support ring, the magnet support ring is rotated so that two magnets adjacent in the circumferential direction partially overlap each ferromagnetic plate of the guide cylinder, and the magnetizing device rotates the magnet support ring. Pull out the guide tube.
【0013】[0013]
【実施例】図2は本発明が適用される永久磁石式渦電流
減速装置の上半分を示す正面断面図、図3は同側面断面
図である。本発明に係る永久磁石式渦電流減速装置は、
電気導体からなる制動ドラム13を回転軸4に結合され
る。このため、車両用変速機の歯車箱2の端壁に軸受3
により支持されかつ端壁から突出する出力回転軸4に、
スプライン孔5aを有する取付フランジ5が嵌合され、
かつ抜け出ないようにナツト6により締結される。取付
フランジ5に駐車ブレーキの制動ドラム7の端壁と、渦
電流減速装置の制動ドラム13のボス部9と一体のフラ
ンジ部9aとが重ね合され、複数のボルト10とナツト
10aにより締結される。FIG. 2 is a front sectional view showing an upper half of a permanent magnet type eddy current reduction device to which the present invention is applied, and FIG. 3 is a side sectional view showing the same. The permanent magnet type eddy current reduction device according to the present invention,
The braking drum 13 made of an electric conductor is connected to the rotating shaft 4. Therefore, the bearing 3 is mounted on the end wall of the gear box 2 of the vehicle transmission.
The output rotation shaft 4 supported by and projected from the end wall,
A mounting flange 5 having a spline hole 5a is fitted,
And it is fastened by the nut 6 so as not to come off. The end wall of the brake drum 7 of the parking brake and the flange portion 9a integral with the boss 9 of the brake drum 13 of the eddy current reduction device are superimposed on the mounting flange 5 and fastened with a plurality of bolts 10 and nuts 10a. .
【0014】制動ドラム13は鉄などの透磁率の大なる
材料からなり、基端部をボス部9から放射方向へ延びる
多数の支持腕(スポーク)12に結合される。制動ドラ
ム13の外周壁には周方向等間隔に、多数の放熱フイン
13aが備えられる。The braking drum 13 is made of a material having a high magnetic permeability such as iron, and is connected at its base end to a number of support arms (spokes) 12 extending radially from the boss 9. A large number of heat radiation fins 13a are provided on the outer peripheral wall of the braking drum 13 at equal intervals in the circumferential direction.
【0015】制動ドラム13の内部に、断面箱形の内空
部15を有する案内筒18が同軸に配設される。非磁性
体からなる不動の案内筒18は、歯車箱2の突壁2aに
外嵌固定した枠板31に、軸方向のボルト32と径方向
のボルト32aにより固定される。案内筒18は外周壁
部18aと内周壁部18bとの両端に環状の端壁板を結
合して構成してもよいが、図示の案内筒18は鉄などの
磁性体からなる左半部の断面コ字形をなす筒部分と、ア
ルミニウムなどの非磁性体からなる右半部の断面逆L字
形をなす筒部分とを、多数のボルト14により結合して
構成される。A guide cylinder 18 having a box-shaped inner space 15 is coaxially arranged inside the braking drum 13. The immobile guide cylinder 18 made of a non-magnetic material is fixed to a frame plate 31 externally fitted to the protruding wall 2a of the gear box 2 with an axial bolt 32 and a radial bolt 32a. The guide tube 18 may be formed by connecting an annular end wall plate to both ends of an outer peripheral wall portion 18a and an inner peripheral wall portion 18b, but the illustrated guide tube 18 has a left half portion made of a magnetic material such as iron. A cylindrical portion having a U-shaped cross section and a cylindrical portion having an inverted L-shaped cross section in the right half made of a non-magnetic material such as aluminum are connected by a number of bolts 14.
【0016】制動ドラム13の内周面と対向する案内筒
18の外周壁部18aに、周方向等間隔に多数の開口が
設けられ、各開口に強磁性板(ポールピース)21が嵌
合固定される。実際には、強磁性板21は外周壁部18
aをアルミニウムから鋳造する際に鋳ぐるまれる。A large number of openings are provided in the outer peripheral wall portion 18a of the guide cylinder 18 facing the inner peripheral surface of the braking drum 13 at equal circumferential intervals, and a ferromagnetic plate (pole piece) 21 is fitted and fixed in each opening. Is done. In practice, the ferromagnetic plate 21 is
a is cast when aluminum is cast from aluminum.
【0017】補強リブ31aを有する枠板31に、周方
向等間隔に複数のアクチユエータ(図示せず)が支持さ
れる。アクチユエータはシリンダにピストンを嵌合して
1対の流体圧室を区画し、ピストンから案内筒18の内
空部15へ突出するロツド17の端部に磁石支持環19
を結合される。磁石支持環19は案内筒18の内空部1
5に軸方向移動可能に支持される。磁石支持環19の外
周壁に、偶数個または4n個(nは自然数)の強磁性板
21にそれぞれ対向する磁石20が、極性が周方向に交
互に異なるように結合される。A plurality of actuators (not shown) are supported on the frame plate 31 having the reinforcing ribs 31a at equal intervals in the circumferential direction. The actuator fits a piston into a cylinder to define a pair of fluid pressure chambers, and a magnet support ring 19 is attached to an end of a rod 17 projecting from the piston to the inner space 15 of the guide cylinder 18.
Will be combined. The magnet support ring 19 is the inner space 1 of the guide cylinder 18.
5 is supported movably in the axial direction. On the outer peripheral wall of the magnet support ring 19, the magnets 20 facing the even number or 4n (n is a natural number) ferromagnetic plates 21, respectively, are coupled so that the polarities are alternately different in the circumferential direction.
【0018】制動時、磁石支持環19は図2,3に示す
ように、アクチユエータのロツド17により制動ドラム
13の内部へ突出される。回転する制動ドラム13が磁
石20から強磁性板21を経て制動ドラム13の内周面
へ及ぶ磁界を横切る時、制動ドラム13に渦電流が発生
し、制動ドラム13に制動トルクを及ぼす。この時、図
3に示すように、磁石支持環19と制動ドラム13との
間に磁気回路40が形成される。制動ドラム13は渦電
流により発熱し、直接または放熱フイン13aを介して
外気により冷却される。At the time of braking, as shown in FIGS. 2 and 3, the magnet support ring 19 is protruded into the brake drum 13 by the rod 17 of the actuator. When the rotating brake drum 13 crosses the magnetic field from the magnet 20 via the ferromagnetic plate 21 to the inner peripheral surface of the brake drum 13, an eddy current is generated in the brake drum 13 and exerts a braking torque on the brake drum 13. At this time, as shown in FIG. 3, a magnetic circuit 40 is formed between the magnet support ring 19 and the braking drum 13. The braking drum 13 generates heat due to the eddy current and is cooled by the outside air directly or through the heat radiation fin 13a.
【0019】非制動時、アクチユエータにより磁石支持
環19を図2の左方へ移動し、制動ドラム13から引退
させれば、磁石20は制動ドラム13へ磁界を及ぼさな
くなり、制動ドラム13は制動トルクを発生しない。上
述のように、渦電流減速装置は磁石20と制動ドラム1
3の相対回転により発生する渦電流に基づく制動力を発
生する。When the brake is not applied, if the magnet support ring 19 is moved to the left in FIG. 2 by the actuator and retreated from the brake drum 13, the magnet 20 does not exert a magnetic field on the brake drum 13, and the brake drum 13 applies the braking torque. Does not occur. As described above, the eddy current reduction device includes the magnet 20 and the braking drum 1.
3 generates a braking force based on the eddy current generated by the relative rotation.
【0020】図1に示すように、本発明は上述したよう
な永久磁石式渦電流減速装置において、着磁する前の磁
石20(厳密には磁石材というべきもの)を磁石支持環
19に取付金具54により結合してから、案内筒18の
内空部15へ収容する。このため、予め磁石支持環19
を案内筒18の内周壁部18bへ嵌装してから、内周壁
部18bを外周壁部18aに多数のボルト14(図2)
により結合する。各磁石20は断面台形をなすものであ
り、偶数個の磁石20を磁石支持環19の外周面に周方
向等間隔に並べたうえ、磁石相互間に断面逆台形の非磁
性体からなる取付金具54を介装し、かつ各取付金具5
4を貫通する複数のボルト55を磁石支持環19へ締結
する。上述のようにして着磁前の磁石20を結合した磁
石支持環19を案内筒18の内部へ、各磁石20が各強
磁性板21に全面的に重なるように収容し、次いで、案
内筒18を着磁装置50の内部へ配置する。As shown in FIG. 1, according to the present invention, in a permanent magnet type eddy current reduction device as described above, a magnet 20 (strictly called a magnet material) before being magnetized is attached to a magnet support ring 19. After being joined by the metal fitting 54, the guide tube 18 is housed in the inner space 15. For this reason, the magnet support ring 19
Is fitted to the inner peripheral wall 18b of the guide cylinder 18, and then the inner peripheral wall 18b is attached to the outer peripheral wall 18a by a number of bolts 14 (FIG. 2).
To join. Each magnet 20 has a trapezoidal cross section. An even number of magnets 20 are arranged on the outer peripheral surface of the magnet support ring 19 at regular intervals in the circumferential direction, and a mounting bracket made of a non-magnetic material having an inverted trapezoidal cross section between the magnets. 54, and each mounting bracket 5
4 are fastened to the magnet support ring 19. As described above, the magnet support ring 19 to which the magnets 20 before magnetization are coupled is housed inside the guide tube 18 so that each magnet 20 completely overlaps each ferromagnetic plate 21. Is arranged inside the magnetizing device 50.
【0021】着磁装置50は磁性体からなる円筒形の継
鉄51の内周壁に、多数の磁心53(磁石20と同数)
を周方向等間隔に配設し、各磁心53に電磁コイル52
を巻装してなる。各磁心53は継鉄51の中心へ延び
る、断面長方形のものであり、各磁心53の先端つまり
磁極53aの端面の周方向寸法と軸方向寸法は、強磁性
板21と同寸に形成される。The magnetizing device 50 has a large number of magnetic cores 53 (the same number as the magnets 20) on the inner peripheral wall of a cylindrical yoke 51 made of a magnetic material.
Are arranged at equal intervals in the circumferential direction, and an electromagnetic coil 52 is attached to each magnetic core 53.
Wrapped around. Each magnetic core 53 has a rectangular section extending to the center of the yoke 51, and the circumferential dimension and the axial dimension of the tip of each magnetic core 53, that is, the end face of the magnetic pole 53 a are formed to be the same as the ferromagnetic plate 21. .
【0022】案内筒18は各強磁性板21が着磁装置5
0の各磁極53aに重なるように配置され、また各磁石
20が各強磁性板21に重なるように位置決めされる。
次いで、周方向に相隣接する電磁コイル52に互いに逆
方向の直流電流を流すと、図1に矢印yで示すように磁
気回路が発生する。すなわち、着磁用磁極53aから、
強磁性板21、磁石20、磁石支持環19、隣りの磁石
20、強磁性板21、磁心53、継鉄51、隣りの磁心
53へと磁気回路yが生じ、磁石20が着磁される。次
いで、各電磁コイル52への通電を停止し、案内筒18
に対して磁石支持環19を磁石20の配列ピツチの半分
だけ回動すると、周方向に隣接する1対の磁石20が共
通の強磁性板21に部分的に重なることになる。着磁さ
れた磁石20が磁極53aに及ぼす吸引力が弱くなり、
案内筒18を着磁装置50から簡単に引き出すことがで
き、強磁性板21により案内筒18の引き出し後の反磁
界の発生が抑えられ、磁石20は減磁を生じない。上述
の実施例において、全部の磁石20をまとめて着磁する
代りに、幾つかの磁石20を数回に分けて着磁してもよ
い。Each of the ferromagnetic plates 21 of the guide cylinder 18 is
The respective magnets 20 are positioned so as to overlap with the respective magnetic poles 53a, and are positioned so as to overlap with the respective ferromagnetic plates 21.
Next, when direct currents in opposite directions are applied to the electromagnetic coils 52 adjacent to each other in the circumferential direction, a magnetic circuit is generated as shown by an arrow y in FIG. That is, from the magnetizing magnetic pole 53a,
A magnetic circuit y is formed on the ferromagnetic plate 21, the magnet 20, the magnet support ring 19, the adjacent magnet 20, the ferromagnetic plate 21, the magnetic core 53, the yoke 51, and the adjacent magnetic core 53, and the magnet 20 is magnetized. Next, the power supply to each electromagnetic coil 52 is stopped, and the guide cylinder 18 is turned off.
When the magnet support ring 19 is rotated by half the pitch of the arrangement of the magnets 20, the pair of magnets 20 adjacent in the circumferential direction partially overlap the common ferromagnetic plate 21. The attractive force exerted on the magnetic pole 53a by the magnetized magnet 20 becomes weak,
The guide cylinder 18 can be easily pulled out from the magnetizing device 50, and the generation of a demagnetizing field after the guide cylinder 18 is pulled out is suppressed by the ferromagnetic plate 21, so that the magnet 20 does not demagnetize. In the above-described embodiment, instead of magnetizing all magnets 20 collectively, some magnets 20 may be magnetized in several times.
【0023】多数の強磁性板21を有する案内筒18の
内部に2つ以上の磁石支持環19,19aが配設される
場合は、各強磁性板21に各磁石支持環19,19aの
磁石20,20aを全面的に重ね合せ、当該磁石20,
20aを全部同極性に着磁する。すなわち、図4,5に
示すように、断面箱形の内空部15を有する案内筒18
の外周壁部18aに周方向等間隔に偶数個(2n個、n
は自然数)の強磁性板21が結合される一方、内周壁部
18bには軸受22aにより磁石支持環19aが回動可
能に支持され、磁石支持環19aの左半部の薄肉円筒部
19bに軸受22により磁石支持環19が回動可能に支
持される。磁石支持環19aは薄肉円筒部19bから案
内筒18の左端壁のスリツト28を経て外方へ突出され
る腕26を、アクチユエータ24のピストンロツド25
に連結される。同様に、磁石支持環19も案内筒18の
左端壁のスリツトを経て外方へ突出される腕を、別のア
クチユエータのピストンロツドに連結される。アクチユ
エータ24はシリンダ27にピストンを嵌挿してなり、
ピストンからピストンロツド25が外部へ突出される。When two or more magnet support rings 19, 19a are provided inside the guide cylinder 18 having a large number of ferromagnetic plates 21, the magnets of the respective magnet support rings 19, 19a are provided on each ferromagnetic plate 21. 20 and 20a are entirely overlapped, and the magnets 20 and 20a are
20a are all magnetized to the same polarity. That is, as shown in FIGS. 4 and 5, a guide cylinder 18 having an inner space 15 having a box-shaped cross section is provided.
Are evenly spaced (2n, n
Is a natural number), while a magnet support ring 19a is rotatably supported by a bearing 22a on the inner peripheral wall 18b, and a bearing is mounted on a thin cylindrical portion 19b in the left half of the magnet support ring 19a. The magnet support ring 19 is rotatably supported by 22. The magnet support ring 19a has an arm 26 projecting outward from the thin cylindrical portion 19b through a slit 28 on the left end wall of the guide cylinder 18 and a piston rod 25 of the actuator 24.
Linked to Similarly, the magnet support ring 19 has an arm protruding outward through a slit in the left end wall of the guide cylinder 18 and connected to a piston rod of another actuator. The actuator 24 is formed by inserting a piston into a cylinder 27,
The piston rod 25 projects from the piston to the outside.
【0024】図5に示すように、磁石支持環19の外周
面には各強磁性板21に2個ずつ対向するように、4n
個の磁石20が所定間隔を存して結合される。磁石支持
環19aの外周面にも各強磁性板21に2個ずつ対向す
るように、4n個の磁石20aが所定間隔を存して結合
される。As shown in FIG. 5, the outer peripheral surface of the magnet support ring 19 has 4n
The magnets 20 are connected at predetermined intervals. 4n magnets 20a are coupled at predetermined intervals to the outer peripheral surface of the magnet support ring 19a such that two magnets face each ferromagnetic plate 21 at a time.
【0025】各磁石20,20aを着磁させるには、図
4に示すように、予め着磁してない磁石20,20aを
各磁石支持環19,19aに結合し、かつ案内筒18へ
それぞれ回動可能に収容し、それぞれ2つの磁石20,
20aが全面的に各強磁性板21に対向するように位置
決めする。次いで、案内筒18を着磁装置50の内部
へ、強磁性板21が磁極53aに全面的に対向するよう
に配置する。磁心53に巻装した電磁コイル52に、相
隣接する磁心53を通る磁界の方向が互いに逆になるよ
うに直流電流を流すと、図1に示す実施例と同様に各強
磁性板21に対向する4つの磁石20,20aが同極に
着磁される。In order to magnetize the magnets 20 and 20a, the magnets 20 and 20a which have not been magnetized beforehand are connected to the magnet support rings 19 and 19a, respectively, as shown in FIG. Rotatably housed, two magnets 20,
Positioning is performed so that the entire surface 20a faces each ferromagnetic plate 21. Next, the guide cylinder 18 is arranged inside the magnetizing device 50 such that the ferromagnetic plate 21 entirely faces the magnetic pole 53a. When a direct current is applied to the electromagnetic coil 52 wound around the magnetic core 53 so that the directions of the magnetic fields passing through the adjacent magnetic cores 53 are opposite to each other, each of the magnetic coils opposes the ferromagnetic plate 21 as in the embodiment shown in FIG. The four magnets 20, 20a to be magnetized have the same polarity.
【0026】次いで、電磁コイル52への通電を停止
し、各磁石支持環19,19aを磁石20,20aの配
列ピツチ分だけ回動すると、図5に示すように、各強磁
性板21に対向して周方向に並ぶ磁石20,20aの極
性が互いに逆になり、各強磁性板21と各磁石支持環1
9,19aとの間に短絡的磁気回路40aが生じ、磁石
20,20aが磁極53aに及ぼす吸引力が小さくな
り、案内筒18を着磁装置50から容易に引き出すこと
ができる。Next, when the energization of the electromagnetic coil 52 is stopped and each magnet support ring 19, 19a is rotated by an arrangement pitch of the magnets 20, 20a, as shown in FIG. As a result, the polarities of the magnets 20 and 20a arranged in the circumferential direction are opposite to each other, so that each ferromagnetic plate 21 and each magnet support ring 1
A short-circuit magnetic circuit 40a is generated between the magnets 9 and 19a, the attraction force exerted by the magnets 20 and 20a on the magnetic pole 53a is reduced, and the guide cylinder 18 can be easily pulled out from the magnetizing device 50.
【0027】図5は実際には制動ドラム13の内部に案
内筒18が配設された渦電流式減速装置を示す。図示の
非制動状態では、各強磁性板21と磁石支持環19,1
9aとの間に短絡的磁気回路40aが生じ、制動ドラム
13に制動力を及ぼさない。磁石支持環19,19aを
磁石20,20aの配列ピツチ分だけ回動すると、各強
磁性板21に対向する4個の磁石20,20aの極性が
同じになり、磁石20,20aの磁界が強磁性板21を
透過して回転する制動ドラム13に作用し、渦電流に基
づく制動力を制動ドラム13に及ぼす。この時、4個の
磁石20,20aが図3に示す磁石20と同じ働きを
し、磁石支持環19,19aと制動ドラム13との間に
磁気回路が形成される。FIG. 5 shows an eddy current type speed reducer in which a guide cylinder 18 is actually provided inside the brake drum 13. In the illustrated non-braking state, each ferromagnetic plate 21 and the magnet support rings 19, 1
9a, a short-circuit magnetic circuit 40a is generated, and no braking force is applied to the braking drum 13. When the magnet support rings 19, 19a are rotated by the pitch of the arrangement of the magnets 20, 20a, the four magnets 20, 20a facing each ferromagnetic plate 21 have the same polarity, and the magnetic fields of the magnets 20, 20a are strong. It acts on the brake drum 13 rotating while passing through the magnetic plate 21, and exerts a braking force based on the eddy current on the brake drum 13. At this time, the four magnets 20, 20a perform the same function as the magnet 20 shown in FIG. 3, and a magnetic circuit is formed between the magnet support rings 19, 19a and the braking drum 13.
【0028】なお、本発明は上述の各実施例に限定され
るものではなく、特願平7-336180号に開示されるよう
な、強磁性板のない非磁性体からなる薄肉の案内筒の内
部へ磁石支持環を収容してなる永久磁石式渦電流減速装
置にも適用できる。この場合は、着磁装置の各磁極を薄
肉の案内筒の外周側から磁石支持環の各磁石へ対向さ
せ、各磁心の電磁コイルに直流電流を流して着磁する。
着磁した後に着磁装置から案内筒を取り出すには、着磁
装置から磁性体の筒体の内部へ案内筒を軸方向に移動す
る。The present invention is not limited to each of the above-described embodiments, but is directed to a thin guide cylinder made of a non-magnetic material without a ferromagnetic plate as disclosed in Japanese Patent Application No. 7-336180. The present invention is also applicable to a permanent magnet type eddy current reduction device having a magnet support ring housed therein. In this case, the respective magnetic poles of the magnetizing device are opposed to the respective magnets of the magnet support ring from the outer peripheral side of the thin guide cylinder, and a DC current is supplied to the electromagnetic coils of the respective magnetic cores for magnetization.
In order to take out the guide cylinder from the magnetizing device after the magnetization, the guide cylinder is moved in the axial direction from the magnetizing device to the inside of the magnetic cylinder.
【0029】[0029]
【発明の効果】本発明は上述のように、永久磁石を用い
て渦電流による制動力を発生させる渦電流減速装置にお
いて、磁性体からなる1個または複数個の磁石支持環の
外周面に着磁前の偶数個または4n個の永久磁石を周方
向に所定の間隔を存して結合し、非磁性体からなる薄肉
の案内筒の内部に前記磁石支持環を収容した後、前記案
内筒を介して前記磁石に対向する磁極を有する着磁装置
の内部へ配置し、前記着磁装置の磁心の電磁コイルに直
流電流を流して前記磁石支持環の外周側から前記永久磁
石に、極性が周方向に1個または2個ずつ交互に異なる
ように着磁するようにしたから次のような効果が得られ
る。As described above, the present invention relates to an eddy current reduction device for generating a braking force by an eddy current using a permanent magnet, which is attached to an outer peripheral surface of one or a plurality of magnet support rings made of a magnetic material. An even number or 4n permanent magnets before magnetism are connected at predetermined intervals in the circumferential direction, and the magnet support ring is housed inside a thin guide cylinder made of a non-magnetic material. The magnet is disposed inside a magnetizing device having a magnetic pole facing the magnet, and a direct current is applied to an electromagnetic coil of a magnetic core of the magnetizing device so that the polarity is changed from the outer peripheral side of the magnet support ring to the permanent magnet. The following effects can be obtained because the magnets are alternately magnetized one by one or two by two in the direction.
【0030】案内筒に対する磁石支持環の組付性が向上
し、磁石支持環の組付けに当り作業者が指や手を傷つけ
る心配がない。The assemblability of the magnet support ring with respect to the guide cylinder is improved, and the worker does not have to worry about damaging his / her finger or hand when assembling the magnet support ring.
【0031】磁石支持環の磁石に着磁した後には、周方
向に隣接する2つの磁石が案内筒の強磁性板に部分的に
重なる位置へ磁石支持環を回動すれば、磁石が着磁装置
へ及ぼす吸引力が弱くなり、案内筒を着磁装置から容易
に引き出すことができる。After the magnets of the magnet support ring are magnetized, the magnets are rotated by rotating the magnet support ring to a position where two circumferentially adjacent magnets partially overlap the ferromagnetic plate of the guide cylinder. The suction force exerted on the device is weakened, and the guide cylinder can be easily pulled out of the magnetizing device.
【図1】本発明に係る往復動型永久磁石式渦電流減速装
置の着磁方法を示す正面断面図である。FIG. 1 is a front sectional view showing a magnetizing method of a reciprocating permanent magnet type eddy current reduction device according to the present invention.
【図2】同渦電流式減速装置の側面断面図である。FIG. 2 is a side sectional view of the eddy current type speed reducer.
【図3】同渦電流式減速装置の制動時の正面断面図であ
る。FIG. 3 is a front sectional view of the eddy current type speed reducer during braking.
【図4】本発明に係る回動型永久磁石式渦電流減速装置
の着磁方法を示す側面断面図である。FIG. 4 is a side sectional view showing a magnetizing method of the rotary permanent magnet eddy current reduction device according to the present invention.
【図5】同渦電流式減速装置の非制動時の正面断面図で
ある。FIG. 5 is a front sectional view of the eddy current type speed reducer when no braking is performed.
4:回転軸 9:ボス部 9a:フランジ部 12:支
持腕 13:制動ドラム 13a:放熱フイン 14:ボルト 15:内空部 1
7:ロツド 18:案内筒 18a:外周壁部 18
b:内周壁部 19,19a:磁石支持筒 19b:薄
肉円筒部 20,20a:永久磁石 21:強磁性板
22,22a:軸受 24:アクチユエータ 25:ロ
ツド 26:腕 27:シリンダ 28:スリツト 3
1:枠板 40,40a:磁気回路 50:着磁装置
51:継鉄 52:電磁コイル 53:磁心 53a:磁極 54:
取付金具 55:ボルト4: rotating shaft 9: boss 9a: flange 12: support arm 13: braking drum 13a: heat radiation fin 14: bolt 15: inner space 1
7: Rod 18: Guide tube 18a: Outer peripheral wall 18
b: inner peripheral wall portion 19, 19a: magnet support cylinder 19b: thin cylindrical portion 20, 20a: permanent magnet 21: ferromagnetic plate
22, 22a: Bearing 24: Actuator 25: Rod 26: Arm 27: Cylinder 28: Slit 3
1: frame plate 40, 40a: magnetic circuit 50: magnetizing device
51: Yoke 52: Electromagnetic coil 53: Magnetic core 53a: Magnetic pole 54:
Mounting bracket 55: bolt
Claims (6)
生させる渦電流減速装置において、磁性体からなる磁石
支持環の外周面に着磁前の永久磁石を周方向に所定の間
隔を存して結合し、案内筒の内部に前記磁石支持環を収
容した後、前記案内筒を介して前記永久磁石に対向する
磁極を有する着磁装置の内部へ前記案内筒を配置し、前
記着磁装置の磁心の電磁コイルに直流電流を流して前記
磁石支持環の外周側から前記永久磁石に着磁することを
特徴とする、永久磁石式渦電流減速装置の着磁方法。In an eddy current reduction device for generating a braking force by eddy current using a permanent magnet, a permanent magnet before magnetizing is provided on an outer peripheral surface of a magnet support ring made of a magnetic material at a predetermined interval in a circumferential direction. After the magnet support ring is accommodated inside the guide cylinder, the guide cylinder is disposed inside a magnetizing device having a magnetic pole facing the permanent magnet via the guide cylinder, and the magnetizing is performed. A magnetizing method for a permanent magnet type eddy current reduction device, characterized in that a direct current is passed through an electromagnetic coil of a magnetic core of the device to magnetize the permanent magnet from an outer peripheral side of the magnet support ring.
生させる渦電流減速装置において、磁性体からなる磁石
支持環の外周面に着磁前の偶数個の永久磁石を周方向に
所定の間隔を存して結合し、非磁性体からなる薄肉の案
内筒の内部に前記磁石支持環を収容した後、前記案内筒
を介して前記永久磁石に対向する磁極を有する着磁装置
の内部へ前記案内筒を配置し、前記着磁装置の磁心の電
磁コイルに直流電流を流して前記磁石支持環の外周側か
ら前記永久磁石に極性が周方向に交互に異なるように着
磁することを特徴とする、永久磁石式渦電流減速装置の
着磁方法。2. An eddy current reduction device for generating a braking force due to an eddy current by using a permanent magnet, wherein an even number of permanent magnets before magnetizing are fixed on an outer peripheral surface of a magnet support ring made of a magnetic material in a circumferential direction. After connecting the magnet support ring inside a thin guide tube made of a non-magnetic material, the magnet support ring is connected to the inside of a magnetizing device having a magnetic pole facing the permanent magnet via the guide tube. The guide cylinder is disposed, and a direct current is passed through an electromagnetic coil of a magnetic core of the magnetizing device to magnetize the permanent magnets from the outer peripheral side of the magnet support ring so that the polarities are alternately different in a circumferential direction. A method for magnetizing a permanent magnet type eddy current reduction device.
生させる渦電流減速装置において、磁性体からなる磁石
支持環の外周面に着磁前の偶数個の永久磁石を周方向等
間隔に結合し、非磁性体からなりかつ前記永久磁石と同
数の強磁性板を周方向等間隔に有する案内筒の内部に前
記磁石支持環を収容し、前記案内筒の各強磁性板に前記
磁石支持環の各永久磁石が全面的に重なるように固定し
た後、各強磁性板の外面に対向する磁極を有する着磁装
置により前記磁石支持環の外周側から前記永久磁石に極
性が周方向に交互に異なるように着磁することを特徴と
する、永久磁石式渦電流減速装置の着磁方法。3. An eddy current reduction device for generating a braking force due to an eddy current using a permanent magnet, wherein an even number of permanent magnets before magnetizing are arranged at equal circumferential intervals on an outer peripheral surface of a magnet support ring made of a magnetic material. The magnet support ring is housed inside a guide cylinder that is coupled, is made of a nonmagnetic material, and has the same number of ferromagnetic plates as the permanent magnets at equal intervals in the circumferential direction. The magnet support ring is accommodated in each ferromagnetic plate of the guide cylinder. After the permanent magnets of the ring are fixed so as to completely overlap each other, the polarity alternates in the circumferential direction from the outer peripheral side of the magnet support ring to the permanent magnets by a magnetizing device having magnetic poles facing the outer surface of each ferromagnetic plate. A method for magnetizing a permanent magnet type eddy current reduction device, characterized in that the magnetizing is performed differently.
生させる渦電流減速装置において、磁性体からなる磁石
支持環の外周面に着磁前の4n個の永久磁石を周方向に
所定の間隔を存して結合し、非磁性体からなりかつ2n
個の強磁性板を周方向等間隔に有する案内筒の内部に前
記磁石支持環を収容し、前記案内筒の各強磁性板に前記
磁石支持環の2個の永久磁石が全面的に重なるように固
定した後、各強磁性板の外面に対向する磁極を有する着
磁装置により前記磁石支持環の外周側から前記永久磁石
に極性が周方向に2個ごとに異なるように着磁すること
を特徴とする、永久磁石式渦電流減速装置の着磁方法。4. An eddy current reduction device for generating a braking force due to an eddy current by using a permanent magnet, wherein 4n permanent magnets before magnetizing are fixed on an outer peripheral surface of a magnet support ring made of a magnetic material in a circumferential direction. Combined at intervals, made of non-magnetic material and 2n
The magnet support ring is housed inside a guide cylinder having a plurality of ferromagnetic plates at equal intervals in the circumferential direction, and the two permanent magnets of the magnet support ring entirely overlap each ferromagnetic plate of the guide cylinder. After fixing the permanent magnets to the permanent magnets, the magnets are magnetized from the outer peripheral side of the magnet support ring so that the polarities are different every two pieces in the circumferential direction from the outer peripheral side of the magnet support ring. A method of magnetizing a permanent magnet type eddy current reduction device.
生させる渦電流減速装置において、磁性体からなる複数
の磁石支持環の外周面にそれぞれ着磁前の偶数個の永久
磁石を周方向等間隔に結合し、非磁性体からなりかつ前
記永久磁石と同数の強磁性板を周方向等間隔に有する案
内筒の内部に前記複数の磁石支持環を収容し、前記複数
の磁石支持環の各永久磁石が軸方向に並びかつ前記案内
筒の各強磁性板に全面的に重なるように固定した後、各
強磁性板の外面に対向する磁極を有する着磁装置により
前記複数の磁石支持環の外周側から前記永久磁石に極性
が周方向に交互に異なるように着磁することを特徴とす
る、永久磁石式渦電流減速装置の着磁方法。5. An eddy current reduction device for generating a braking force by an eddy current using permanent magnets, wherein an even number of permanent magnets before magnetization are respectively provided on the outer peripheral surfaces of a plurality of magnet support rings made of a magnetic material in the circumferential direction. The plurality of magnet support rings are housed inside a guide cylinder which is made of non-magnetic material and has the same number of ferromagnetic plates as the permanent magnets at equal intervals in the circumferential direction. After the permanent magnets are aligned in the axial direction and fixed so as to completely overlap each ferromagnetic plate of the guide cylinder, the plurality of magnet support rings are rotated by a magnetizing device having a magnetic pole facing the outer surface of each ferromagnetic plate. A method of magnetizing a permanent magnet type eddy current reduction device, characterized in that the permanent magnets are magnetized so that their polarities alternately differ in the circumferential direction from the outer peripheral side of the magnet.
の各強磁性板に前記磁石支持環の周方向に隣接しかつ極
性が互いに異なる2つの永久磁石が重なるように、前記
磁石支持環を回動し、前記着磁装置から前記案内筒を引
き出す、請求項3〜5のいずれかに記載の永久磁石式渦
電流減速装置の着磁方法。6. The magnet support so that, after magnetizing the permanent magnet, two permanent magnets adjacent to each other in the circumferential direction of the magnet support ring and having different polarities overlap each other on each ferromagnetic plate of the guide cylinder. The magnetizing method for a permanent magnet type eddy current reduction device according to any one of claims 3 to 5, wherein the ring is rotated to pull out the guide cylinder from the magnetizing device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28304497A JP3671621B2 (en) | 1997-09-30 | 1997-09-30 | Magnetization method of permanent magnet type eddy current reduction device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28304497A JP3671621B2 (en) | 1997-09-30 | 1997-09-30 | Magnetization method of permanent magnet type eddy current reduction device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH11113224A true JPH11113224A (en) | 1999-04-23 |
JP3671621B2 JP3671621B2 (en) | 2005-07-13 |
Family
ID=17660493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP28304497A Expired - Fee Related JP3671621B2 (en) | 1997-09-30 | 1997-09-30 | Magnetization method of permanent magnet type eddy current reduction device |
Country Status (1)
Country | Link |
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JP (1) | JP3671621B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006340428A (en) * | 2005-05-31 | 2006-12-14 | Sumitomo Metal Ind Ltd | Eddy current type reduction gear |
JP2006345607A (en) * | 2005-06-07 | 2006-12-21 | Sumitomo Metal Ind Ltd | Eddy current type reduction gear |
CN100429524C (en) * | 2006-07-27 | 2008-10-29 | 南京大学 | DC magnetic field sensor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8766753B2 (en) | 2009-07-09 | 2014-07-01 | General Electric Company | In-situ magnetizer |
-
1997
- 1997-09-30 JP JP28304497A patent/JP3671621B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006340428A (en) * | 2005-05-31 | 2006-12-14 | Sumitomo Metal Ind Ltd | Eddy current type reduction gear |
JP4600156B2 (en) * | 2005-05-31 | 2010-12-15 | 住友金属工業株式会社 | Eddy current reducer |
JP2006345607A (en) * | 2005-06-07 | 2006-12-21 | Sumitomo Metal Ind Ltd | Eddy current type reduction gear |
JP4604857B2 (en) * | 2005-06-07 | 2011-01-05 | 住友金属工業株式会社 | Eddy current reducer |
CN100429524C (en) * | 2006-07-27 | 2008-10-29 | 南京大学 | DC magnetic field sensor |
Also Published As
Publication number | Publication date |
---|---|
JP3671621B2 (en) | 2005-07-13 |
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