JPH0529285U - Magnetic circuit - Google Patents
Magnetic circuitInfo
- Publication number
- JPH0529285U JPH0529285U JP7736791U JP7736791U JPH0529285U JP H0529285 U JPH0529285 U JP H0529285U JP 7736791 U JP7736791 U JP 7736791U JP 7736791 U JP7736791 U JP 7736791U JP H0529285 U JPH0529285 U JP H0529285U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic circuit
- yoke
- permanent magnets
- flux density
- 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
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- Linear Motors (AREA)
Abstract
(57)【要約】 （修正有）
【目的】 小形・軽量であって、しかも、高推力が得ら
れる磁気回路を提供する。
【構成】 一対の平板状ヨーク２ａ，２ｂを所定間隔を
おいて対向配置し、各ヨーク２ａ，２ｂの長手方向に沿
って複数個の永久磁石４ａ，４ｂを所定間隔をおいてか
つ異極性の磁極が対向する如く固着し、更に永久磁石４
ａ，４ｂ間の空隙長ｇが８５mmの時に、この空隙５にお
ける平均磁束密度を５０００Ｇ以上とする。
(57) [Summary] (Modified) [Purpose] To provide a magnetic circuit that is compact and lightweight, and that provides high thrust. A pair of flat plate-shaped yokes 2a and 2b are arranged to face each other at a predetermined interval, and a plurality of permanent magnets 4a and 4b are provided at a predetermined interval and have different polarities along the longitudinal direction of each yoke 2a and 2b. The magnetic poles are fixed so that they face each other, and the permanent magnet 4
When the gap length g between a and 4b is 85 mm, the average magnetic flux density in this gap 5 is set to 5000 G or more.
Description
【０００１】[0001]
本考案は、ヨークと永久磁石とを有する磁気回路に係り、特に台車方式リニア モータカーの車上界磁などに使用される磁気回路に関する。 The present invention relates to a magnetic circuit having a yoke and a permanent magnet, and more particularly to a magnetic circuit used for an on-vehicle field of a truck type linear motor car.
【０００２】[0002]
リニアモータで推進力を得て車両を走行させるリニアモータカーとしては、種 々の方式のものが検討されているが、その一つとして、界磁極を台車上に集中し て車上に配置し、地上に電機子コイルを配置したリニア同期モータを用いたもの が知られている。この方式は主電力を供給する側を地上に置くので（地上一次） 、車上機器が軽量化されるため、高速化に適している。 Various types of linear motor cars are being studied as a linear motor car that drives the vehicle by using a linear motor to obtain propulsive force.One of them is to arrange the field poles on the dolly by concentrating on the trolley. It is known to use a linear synchronous motor with an armature coil arranged on the ground. Since this system places the main power supply side on the ground (primary ground), it is suitable for speeding up because the weight of on-board equipment is reduced.
【０００３】 上記の車上界磁の構造としては、超電導磁石あるいは電磁石を用いることが最 初に検討されたが、前者には漏洩磁界が多いという問題があり、後者には、消費 電力が大きい、励磁コイルの冷却装置が必要となる等の問題があり、現時点では 実用化には至っていない。As a structure of the above-mentioned on-vehicle field, the use of a superconducting magnet or an electromagnet was first examined, but the former has a problem of a large leakage magnetic field, and the latter has a large power consumption. However, there are problems such as the need for a cooling device for the excitation coil, and it has not been put to practical use at this time.
【０００４】 そこで最近は、永久磁石を使用した車上界磁用磁気回路が検討されている（例 えば「ＪＲＥＡ １９９１年 ＶＯＬ．３４ Ｎｏ．１」参照）。このような磁 気回路としては、例えばコ字形に形成したヨークの内側に永久磁石をそれぞれ固 着し、永久磁石間に電磁子コイルを介装するための磁気空隙を形成した構造のも のが一般的である。Therefore, recently, a magnetic circuit for an on-vehicle field using a permanent magnet has been studied (see, for example, “JREA 1991 VOL.34 No. 1”). Such a magnetic circuit has, for example, a structure in which permanent magnets are fixed inside a yoke formed in a U-shape, and a magnetic gap is formed between the permanent magnets for interposing an electromagnetic coil. It is common.
【０００５】[0005]
しかるに前述した磁気回路は基本的には電磁石式界磁における励磁コイルを永 久磁石に置き換えただけのものであり、次に述べるような問題点がある。すなわ ち磁路を形成するためのヨークが、比重の大なる鉄鋼材料でコ字形に形成されて いるので、磁気回路の重量が大となる。したがって台車重量が大となるので、地 上に設置したコイルに流す電流を多くしないと、高速化に対応できないという問 題がある。 本考案は、このような問題点を解消し、軽量で、かつ、車上界磁に適した磁気 回路を提供することを目的とする。 However, the above-mentioned magnetic circuit is basically only the permanent magnet replacing the exciting coil in the electromagnet type field, and has the following problems. That is, the yoke for forming the magnetic path is made of a steel material having a large specific gravity in a U-shape, and therefore the weight of the magnetic circuit becomes large. Therefore, since the weight of the trolley becomes large, there is a problem that it is not possible to cope with the speedup unless the current supplied to the coil installed on the ground is increased. An object of the present invention is to solve the above problems and to provide a magnetic circuit which is lightweight and suitable for the on-vehicle field.
【０００６】[0006]
本考案は、前述のような問題点を解決するため、所定間隔をおいて対向配置さ れた一対の平板状ヨークと、前記ヨークの長手方向に沿って所定間隔をおいて配 置されかつ異極性の磁極が対向する如く前記各ヨークに固着された複数個のブロ ック状永久磁石とを有する磁気回路において、前記永久磁石間に形成された磁気 空隙が８５mmの場合に、この空隙における平均磁束密度を５０００Ｇ以上とする 、という技術的手段を採用した。 In order to solve the above-mentioned problems, the present invention provides a pair of flat plate-like yokes that are opposed to each other at a predetermined interval and a pair of different yokes that are arranged at a predetermined interval along the longitudinal direction of the yoke. In a magnetic circuit having a plurality of block-shaped permanent magnets fixed to each of the yokes so that the magnetic poles of opposite polarities face each other, when the magnetic gap formed between the permanent magnets is 85 mm, the average in this gap We adopted the technical means of increasing the magnetic flux density to 5000 G or more.
【０００７】[0007]
磁路となるヨークを一対の平板状ヨークを対向配置して形成するので、ヨーク の重量を従来よりも小さくすることができる。また永久磁石間の磁気空隙長が８ ５mmの時に、この空隙における平均磁束密度を５０００Ｇ以上とするので、車上 界磁に使用した時に電機子コイルに過大な電流を流さなくても大きな推力を発生 させることができる。 Since the yoke serving as the magnetic path is formed by arranging the pair of flat plate-like yokes so as to face each other, the weight of the yoke can be made smaller than in the conventional case. Also, when the magnetic gap length between the permanent magnets is 85 mm, the average magnetic flux density in this gap is set to 5000 G or more, so when used for the vehicle field, a large thrust force can be applied without applying an excessive current to the armature coil. Can be generated.
【０００８】[0008]
以下、本考案の実施例について図面を参照して説明する。 図１、図２、および図３は各々本考案の一実施例を示す断面図、図１における Ａ−Ａ線断面図、および図１におけるＢ−Ｂ線断面図である。図１ないし図３に おいて、磁気回路１は、鉄、鋼等の強磁性材料からなる平板状のヨーク２ａおよ び２ｂと、これらを保持するアルミニウム合金、プラスチックなどの非磁性材料 からなる支持部材３とを有する。ヨーク２ａには、厚さ（ｗ1）方向に磁化され たブロック状の永久磁石４ａが所定間隔をおいて長手方向に沿って取り付けられ ている。同様にヨーク２ｂにも、厚さ方向に磁化されたブロック状の永久磁石４ ｂが所定間隔をおいて取り付けられている。永久磁石４ａと４ｂとは異極性の磁 極が対向するように配置され、両磁石間には所定の空隙長（ｇ）をもった磁気空 隙５が形成される。Embodiments of the present invention will be described below with reference to the drawings. 1, FIG. 2, and FIG. 3 are a sectional view showing an embodiment of the present invention, a sectional view taken along the line AA in FIG. 1, and a sectional view taken along the line BB in FIG. 1 to 3, the magnetic circuit 1 is made of flat plate-shaped yokes 2a and 2b made of a ferromagnetic material such as iron or steel, and a non-magnetic material such as an aluminum alloy or plastic that holds them. And a support member 3. Block-shaped permanent magnets 4a magnetized in the thickness (w 1 ) direction are attached to the yoke 2a along the longitudinal direction at predetermined intervals. Similarly, block-shaped permanent magnets 4b magnetized in the thickness direction are attached to the yoke 2b at predetermined intervals. The permanent magnets 4a and 4b are arranged so that magnetic poles of opposite polarities face each other, and a magnetic space 5 having a predetermined air gap length (g) is formed between the two magnets.
【０００９】 上記の永久磁石としては、希土類磁石やアルニコ磁石等の公知の永久磁石を使 用できるが、磁気回路を軽量化する上で希土類磁石のように起磁力の高いものが 望ましく、特に４０ＭＧＯｅ以上の最大エネルギー積を有するものも製造されて いるＲ−Ｆｅ−Ｂ系磁石（Ｒ：Ｎｄ、Ｐｒ等の希土類元素の１種以上）を用いる ことが望ましい。Known permanent magnets such as rare earth magnets and alnico magnets can be used as the above-mentioned permanent magnets, but those having a high magnetomotive force such as rare earth magnets are desirable in order to reduce the weight of the magnetic circuit, and particularly 40MGOe. It is desirable to use an R—Fe—B based magnet (R: one or more rare earth elements such as Nd and Pr) which is also manufactured to have the above maximum energy product.
【００１０】 上記の磁気回路１は、一対の平板状ヨークを使用しているので、従来のものよ りもヨーク部の重量が小となり、軽量化を達成できる。またこの磁気回路は、各 ヨークに永久磁石を固着したものを、支持部材にその両側から挿入することによ り容易に組み立てることができるので、組立工数を低減することが可能である。Since the above magnetic circuit 1 uses the pair of flat plate-shaped yokes, the weight of the yoke portion is smaller than that of the conventional one, and the weight can be reduced. Further, this magnetic circuit can be easily assembled by inserting the permanent magnets fixed to the respective yokes into the support member from both sides thereof, so that the number of assembling steps can be reduced.
【００１１】 図４は本考案の他の実施例を示す正面図であり、図１と同一部分は同一の参照 符号で示す。図４において、永久磁石４１ａおよび４１ｂはコ字形に形成され、 中央部の厚さが端部の厚さよりも小となっている。この永久磁石によれば、図１ の永久磁石よりも重量が小さくなり、磁気回路をより軽量化することができる。FIG. 4 is a front view showing another embodiment of the present invention, and the same parts as those in FIG. 1 are designated by the same reference numerals. In FIG. 4, the permanent magnets 41a and 41b are formed in a U shape, and the thickness of the central portion is smaller than the thickness of the end portions. According to this permanent magnet, the weight is smaller than that of the permanent magnet shown in FIG. 1, and the magnetic circuit can be further reduced in weight.
【００１２】 図５は磁気空隙における永久磁石の高さ（ｈ）方向の磁束密度分布を示す図で ある。図５において、曲線ａは図１の磁束密度分布を、曲線ｂは図４の磁束密度 分布を示す。これらの磁束密度分布は、ヨーク材質をＳＳ４００、永久磁石材質 をＮｄ−Ｆｅ−Ｂ系磁石［日立金属（株）製ＨＳ３７ＢＨ］とし、磁石寸法をｈ ＝１４０mm、Ｗ1＝８０mm、磁気空隙長（ｇ）を８５mm、ヨーク幅Ｗ2を７０mmと し、３００mmピッチで磁場の向きが無限に周期的に変化すると仮定して磁場解析 を行なって得られたものである。FIG. 5 is a diagram showing a magnetic flux density distribution in the height (h) direction of the permanent magnet in the magnetic gap. In FIG. 5, the curve a shows the magnetic flux density distribution of FIG. 1, and the curve b shows the magnetic flux density distribution of FIG. These magnetic flux density distributions are as follows: the yoke material is SS400, the permanent magnet material is Nd-Fe-B magnet [HS37BH manufactured by Hitachi Metals, Ltd.], the magnet dimensions are h = 140 mm, W 1 = 80 mm, and the magnetic gap length ( g) is 85 mm, the yoke width W 2 is 70 mm, and the magnetic field analysis is performed on the assumption that the direction of the magnetic field changes indefinitely at a pitch of 300 mm.
【００１３】 現在実用化が検討されている永久磁石式車上界磁においては、電機子コイルに 流す電流を３０００Ａ以下に収めることが必要なので、磁気空隙長が８５mmの場 合に、磁気空隙の磁石高さ方向の平均磁束密度は５０００Ｇ以上となる必要があ る。ここで図５の曲線ａで示すように、図１の場合は最大磁束密度が６６００Ｇ となるので、この条件を満足し得る。In the permanent magnet type vehicle upper field, which is currently being studied for practical use, it is necessary to keep the current flowing in the armature coil at 3000 A or less. Therefore, when the magnetic gap length is 85 mm, the magnetic gap The average magnetic flux density in the magnet height direction must be 5000 G or more. Here, as shown by the curve a in FIG. 5, in the case of FIG. 1, the maximum magnetic flux density is 6600 G, so this condition can be satisfied.
【００１４】 また車上界磁用磁気回路では、上述したように平均磁束密度が重要なので、磁 束密度分布が図５の曲線ｂで示すものであってもよく、従って図３に示す形状の 永久磁石を用いることも可能である。In the on-vehicle field magnetic circuit, since the average magnetic flux density is important as described above, the magnetic flux density distribution may be that shown by the curve b in FIG. 5, and therefore the shape shown in FIG. It is also possible to use a permanent magnet.
【００１５】 また本考案の磁気回路を前述した条件で構成した場合、ヨークの重量はコ字形 のものの１／４以下になり、大幅な軽量化を達成できることが明らかである。Further, when the magnetic circuit of the present invention is constructed under the above-mentioned conditions, the weight of the yoke is 1/4 or less of the U-shaped one, and it is clear that a significant weight reduction can be achieved.
【００１６】[0016]
以上説明したように本考案によれば、一対の平板状ヨークを使用するので、磁 気回路を軽量化できると共に、磁気空隙間の磁束密度を高いレベルに維持するの で、車上界磁に使用した場合に高い推力を得ることができるという効果を発揮で きる。 As described above, according to the present invention, since a pair of flat plate-shaped yokes are used, the magnetic circuit can be lightened and the magnetic flux density between the magnetic air gaps can be maintained at a high level. It can exert the effect of obtaining high thrust when used.
【図面の簡単な説明】[Brief description of drawings]
【図１】本考案の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】図１におけるＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along line AA in FIG.
【図３】図１におけるＢ−Ｂ線断面図である。FIG. 3 is a sectional view taken along line BB in FIG.
【図４】本考案の他の実施例を示す正面図である。FIG. 4 is a front view showing another embodiment of the present invention.
【図５】磁気空隙における平均磁束密度分布を示す図で
ある。FIG. 5 is a diagram showing an average magnetic flux density distribution in a magnetic gap.
１ 磁気回路 ２ａ、２ｂ ヨーク ３ 支持部材 ４ａ、４ｂ 永久磁石 ５ 磁気空隙 1 magnetic circuit 2a, 2b yoke 3 support member 4a, 4b permanent magnet 5 magnetic gap
Claims (2)
平板状ヨークと、前記ヨークの長手方向に沿って所定間
隔をおいて配置されかつ異極性の磁極が対向する如く前
記各ヨークに固着された複数個のブロック状永久磁石と
を有する磁気回路において、前記永久磁石間に形成され
た磁気空隙が８５mmの場合に、この空隙における平均磁
束密度が５０００Ｇ以上であることを特徴とする磁気回
路。1. A pair of flat plate-like yokes, which are opposed to each other at a predetermined interval, and fixed to each of the yokes so that magnetic poles of different polarities, which are arranged at a predetermined interval along the longitudinal direction of the yoke, face each other. In a magnetic circuit having a plurality of block-shaped permanent magnets, the average magnetic flux density in the magnetic gap is 5000 G or more when the magnetic gap formed between the permanent magnets is 85 mm. .
端部の厚さよりも大であることを特徴とする請求項１記
載の磁気回路。2. The magnetic circuit according to claim 1, wherein the thickness of the central portion of the permanent magnet in the height direction is greater than the thickness of both end portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991077367U JP2567013Y2 (en) | 1991-09-25 | 1991-09-25 | Magnetic circuit for linear motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991077367U JP2567013Y2 (en) | 1991-09-25 | 1991-09-25 | Magnetic circuit for linear motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0529285U true JPH0529285U (en) | 1993-04-16 |
| JP2567013Y2 JP2567013Y2 (en) | 1998-03-30 |
Family
ID=13631938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991077367U Expired - Lifetime JP2567013Y2 (en) | 1991-09-25 | 1991-09-25 | Magnetic circuit for linear motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2567013Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4729434B2 (en) * | 2006-05-12 | 2011-07-20 | カヤバ工業株式会社 | Magnetorheological fluid shock absorber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5935559A (en) * | 1982-08-24 | 1984-02-27 | Tokyo Erekutoron Kk | Cantilever type linear motor |
-
1991
- 1991-09-25 JP JP1991077367U patent/JP2567013Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5935559A (en) * | 1982-08-24 | 1984-02-27 | Tokyo Erekutoron Kk | Cantilever type linear motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4729434B2 (en) * | 2006-05-12 | 2011-07-20 | カヤバ工業株式会社 | Magnetorheological fluid shock absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2567013Y2 (en) | 1998-03-30 |
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