JP2010112512A - Axial magnetic bearing - Google Patents

Axial magnetic bearing Download PDF

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JP2010112512A
JP2010112512A JP2008287312A JP2008287312A JP2010112512A JP 2010112512 A JP2010112512 A JP 2010112512A JP 2008287312 A JP2008287312 A JP 2008287312A JP 2008287312 A JP2008287312 A JP 2008287312A JP 2010112512 A JP2010112512 A JP 2010112512A
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permanent magnet
stator
rotor
polarity
yoke
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JP5074356B2 (en
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Yoji Okada
養二 岡田
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OITAKEN SANGYO SOZO KIKO
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OITAKEN SANGYO SOZO KIKO
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0459—Details of the magnetic circuit

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a further miniaturizable axial magnetic bearing obtaining sufficient bias magnetic flux, excellent in controllability, and achieving reduction of the weight and power consumption. <P>SOLUTION: The axial magnetic bearing includes a stator 10, and a rotor 20 supported in a non-contact state and rotated by the stator 10 by magnetic force. The rotor 20 includes an annular bias permanent magnet 24 magnetized in the radial direction. A magnetic flux convergence permanent magnet 25 is attached to an outer peripheral surface of the bias permanent magnet 24, and has a V shaped groove 26 extended in a circumferential direction on an outer peripheral surface. The magnetic flux convergence permanent magnet 25 is magnetized in the axial direction so that both sides of the V shaped groove 26 have polarity same with the polarity on the outer peripheral surface of the bias permanent magnet 24, and a magnet flux concentration part is formed in the vicinity of the V shaped groove 26. The stator 10 has a yoke 12 opposed to the V shaped groove 26, and a control winding 13 wound around the yoke 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、磁気力によってロータを非接触状態で軸方向に支持しロータの軸方向の位置制御を可能とするアキシャル磁気軸受に関し、特に永久磁石によるバイアス磁束を用いて電磁石の消費電力を低減させるようにしたハイブリッド型のアキシャル磁気軸受に関する。   The present invention relates to an axial magnetic bearing that enables axial control of a rotor by supporting the rotor in a non-contact state by a magnetic force and, in particular, reducing the power consumption of the electromagnet using a bias magnetic flux by a permanent magnet. The present invention relates to a hybrid type axial magnetic bearing.

一般的なアキシャル磁気軸受は、スラスト磁気軸受とも呼ばれ、ロータの一部に外径の大きなディスクを設け、その両側にステータを設ける構造が多い。ロータディスクの外側に円形の吸引力を発揮させる電磁石を設けたステータホルダを配置し、両側の吸引力を制御することでアキシャル方向の制御力を発生させる。このような従来型のアキシャル磁気軸受は、製作及び組立が困難で、ステータを分解しないとロータを取り外すことができないため、メンテナンスも困難であるという問題がある。これらの問題を解決するために、ロータの最大径がステータの最大径よりも小さく、ロータを軸方向に抜くことができる方式が幾つか提案されている（特許文献１、特許文献２等）。
特開平１１−１０１２３５号公報（段落０００９〜００１１、図１３） 特開平０８−２３２９５５号公報（段落００２５〜００２７、図１） A general axial magnetic bearing is also called a thrust magnetic bearing and has a structure in which a disk having a large outer diameter is provided in a part of a rotor and a stator is provided on both sides thereof. A stator holder provided with an electromagnet that exerts a circular attractive force on the outer side of the rotor disk is arranged, and a control force in the axial direction is generated by controlling the attractive force on both sides. Such a conventional type axial magnetic bearing is difficult to manufacture and assemble, and the rotor cannot be removed unless the stator is disassembled, so that maintenance is also difficult. In order to solve these problems, several methods have been proposed in which the maximum diameter of the rotor is smaller than the maximum diameter of the stator and the rotor can be pulled out in the axial direction (Patent Document 1, Patent Document 2, etc.).
JP-A-11-101235 (paragraphs 0009 to 0011, FIG. 13) Japanese Patent Laid-Open No. 08-232955 (paragraphs 0025 to 0027, FIG. 1)

しかしながら、従来の上述したアキシャル磁気軸受は、アキシャル方向力が小さく、充分大きな制御力を得ることが困難であるため、電力消費量も大きいという問題がある。   However, the conventional axial magnetic bearing described above has a problem that the axial direction force is small and it is difficult to obtain a sufficiently large control force, so that the power consumption is also large.

本発明は、このような問題点に鑑みてなされたもので、充分なバイアス磁束が得られ、制御性に優れ、より一層の小型化、軽量化及び低消費電力化が図れるハイブリッド型のアキシャル磁気軸受を提供することを目的とする。   The present invention has been made in view of such problems, and is a hybrid type axial magnet that can obtain a sufficient bias magnetic flux, has excellent controllability, and can be further reduced in size, weight, and power consumption. An object is to provide a bearing.

本発明に係るアキシャル磁気軸受は、ステータと、このステータに磁気力によって非接触状態で支持されて回転するロータとを有しロータの軸方向の位置制御を行うアキシャル磁気軸受において、前ロータが、ロータ本体と、このロータ本体に装着されて前記ロータの径方向に着磁された環状のバイアス用永久磁石と、このバイアス用永久磁石の外周面に装着されると共に外周面側に周方向に延びる溝を有し、この溝の両側が前記バイアス用永久磁石の外周面に現れる極性と同一極性となるように軸方向に着磁されて前記溝の近傍に磁束集中部を形成する環状の磁束収束用永久磁石とを有し、前記ステータが、前記溝と所定のギャップを介して対向する先端部を有するヨークと、このヨークに巻回された制御用巻線とを有することを特徴とする。   An axial magnetic bearing according to the present invention is an axial magnetic bearing that includes a stator and a rotor that is supported and rotated in a non-contact state by the magnetic force in the stator and performs axial position control of the rotor. A rotor body, an annular biasing permanent magnet attached to the rotor body and magnetized in the radial direction of the rotor, and attached to the outer peripheral surface of the biasing permanent magnet and extending circumferentially toward the outer peripheral surface side An annular magnetic flux converging that has a groove and is magnetized in the axial direction so that both sides of the groove have the same polarity as the polarity appearing on the outer peripheral surface of the biasing permanent magnet to form a magnetic flux concentrating portion in the vicinity of the groove The stator has a yoke having a tip portion facing the groove with a predetermined gap, and a control winding wound around the yoke. .

本発明の一つの実施形態では、前記バイアス用永久磁石は、前記ロータの軸方向の一方の側の外周面を第1極性、他方の側の外周面を第２極性として径方向に着磁され、前記磁束収束用永久磁石は、前記バイアス用永久磁石の第１極性の部分と第２極性の部分にそれぞれ前記溝としてＶ溝を有し、前記第１極性の部分に配置されたＶ溝の両側はそれぞれ第１極性、前記第２極性の部分に配置されたＶ溝の両側はそれぞれ第２極性となるように軸方向に着磁されたものであり、前記ステータのヨークは、前記Ｖ溝に対向する部分にそれぞれ周方向に延びる溝を形成した断面Ｅ字型の磁性体からなり、前記ステータの制御用巻線は、前記ヨークの溝に収容されていることを特徴とする。   In one embodiment of the present invention, the permanent magnet for bias is magnetized in the radial direction with the outer peripheral surface on one side in the axial direction of the rotor as the first polarity and the outer peripheral surface on the other side as the second polarity. The magnetic flux converging permanent magnet has a V-groove as the groove in each of the first polarity portion and the second polarity portion of the bias permanent magnet, and the V-groove arranged in the first polarity portion. Both sides of the V-groove arranged at the first polarity and the second polarity are magnetized in the axial direction so that both sides of the V-polarity are at the second polarity, respectively, and the yoke of the stator has the V-groove It is made of a magnetic body having an E-shaped cross section in which a groove extending in the circumferential direction is formed in a portion facing each other, and the control winding of the stator is housed in the groove of the yoke.

本発明の他の実施形態では、前記ロータ本体と前記バイアス用永久磁石との間に環状の磁性体からなるバックヨークを設けたことを特徴とする。   In another embodiment of the present invention, a back yoke made of an annular magnetic body is provided between the rotor body and the biasing permanent magnet.

本発明の更に他の実施形態では、前記ステータは、前記ロータの周囲に配置された複数のステータユニットにより構成され、前記各ステータユニットは、軸方向と直交する方向に積層された積層鋼板からなるヨークを有する。   In still another embodiment of the present invention, the stator is composed of a plurality of stator units arranged around the rotor, and each stator unit is composed of laminated steel plates laminated in a direction orthogonal to the axial direction. Has a yoke.

本発明によれば、バイアス用永久磁石の外周面に磁束収束用永久磁石を装着し、この磁束収束用永久磁石の外周面側に周方向に延びる溝を形成すると共に、この溝の両側がバイアス用永久磁石の外周面に現れる極性と同一極性となるように磁束収束用永久磁石を軸方向に着磁しているので、溝の近傍に磁束集中部を形成することができ、この磁束集中部をステータ側のヨークと結合することにより、アキシャル方向の支持力を充分大きくすることができ、大きな制御力を得ることができる。   According to the present invention, the magnetic flux concentrating permanent magnet is mounted on the outer peripheral surface of the bias permanent magnet, the groove extending in the circumferential direction is formed on the outer peripheral surface side of the magnetic flux converging permanent magnet, and both sides of the groove are biased. Since the magnetic flux concentrating permanent magnet is magnetized in the axial direction so as to have the same polarity as that appearing on the outer peripheral surface of the permanent magnet for magnetic flux, a magnetic flux concentrating portion can be formed in the vicinity of the groove. Is coupled to the stator side yoke, the supporting force in the axial direction can be sufficiently increased, and a large control force can be obtained.

また、本発明によれば、バイアス磁束の磁束密度を高められるので、制御コイルに大きな支持力を担わせる必要が無く、その結果、電力消費量も削減することができる。   Further, according to the present invention, since the magnetic flux density of the bias magnetic flux can be increased, it is not necessary to give a large supporting force to the control coil, and as a result, the power consumption can be reduced.

以下、添付の図面を参照して、この発明の好ましい実施の形態を説明する。
図１は、本発明の第１の実施形態に係るアキシャル磁気軸受の構成を示す断面図、図２は、図１のＡ−Ａ断面図である。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing a configuration of an axial magnetic bearing according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

このアキシャル磁気軸受は、外側に配置されたステータ１０と、このステータ１０の内側に配置されたロータ２０とを有する。   This axial magnetic bearing has a stator 10 disposed outside and a rotor 20 disposed inside the stator 10.

ステータ１０は、この例では、ロータ２０の外周に周方向に配置された８個のステータユニット１１により構成されている。各ステータユニット１１は、磁性体で形成されたヨーク１２と、このヨーク１２に巻回された制御用巻線１３とを有する。ヨーク１２は、高周波性能を高めるために横方向に積層された積層鋼板により形成されている。ヨーク１２は、ロータ２０との対向面がロータ２０と所定のギャップＧ１を介して対向するように円弧状に形成され、その対向面の軸方向２箇所に周方向に延びる溝１４ａ，１４ｂが形成されることにより断面がＥ字状に形成されている。つまり、軸方向に３つの突極が形成される。溝１４のロータ２０側端部は、それぞれ内側に張り出してギャップＧ２を介して対向している。そして、ヨーク１２の真ん中の突極に制御用巻線１３が巻回されている。   In this example, the stator 10 is composed of eight stator units 11 arranged on the outer periphery of the rotor 20 in the circumferential direction. Each stator unit 11 has a yoke 12 formed of a magnetic material and a control winding 13 wound around the yoke 12. The yoke 12 is formed of laminated steel plates laminated in the lateral direction in order to enhance high frequency performance. The yoke 12 is formed in an arc shape so that the surface facing the rotor 20 faces the rotor 20 via a predetermined gap G1, and grooves 14a and 14b extending in the circumferential direction are formed at two axial positions of the facing surface. As a result, the cross section is formed in an E shape. That is, three salient poles are formed in the axial direction. The end portions of the grooves 14 on the side of the rotor 20 project inward and face each other via a gap G2. A control winding 13 is wound around the salient pole in the middle of the yoke 12.

一方、ロータ２０は、ロータ本体２１と、このロータ本体２１の外周に形成された溝２２に内周側から順に同軸的に取り付けられた環状のバックヨーク２３、バイアス用永久磁石２４及び磁束収束用永久磁石２５を備えて構成されている。バックヨーク２３は、高磁性体からなる。バイアス用永久磁石２４は、バックヨーク２３の外周面の軸方向の一方の側と他方の側とに２分されており、更に組立の容易性を考慮して周方向に４分割されている。軸方向の一方の側のバイアス用永久磁石２４ａは外周面側をＮ極とし、軸方向の他方の側のバイアス用永久磁石２４ｂは外周面側をＳ極とするようにそれぞれ径方向に着磁されている。   On the other hand, the rotor 20 includes a rotor main body 21, an annular back yoke 23 coaxially attached in order from the inner peripheral side to a groove 22 formed on the outer periphery of the rotor main body 21, a bias permanent magnet 24, and a magnetic flux converging element. A permanent magnet 25 is provided. The back yoke 23 is made of a high magnetic material. The permanent magnet 24 for bias is divided into two on one side and the other side in the axial direction of the outer peripheral surface of the back yoke 23, and further divided into four in the circumferential direction in consideration of ease of assembly. The biasing permanent magnet 24a on one side in the axial direction is magnetized in the radial direction so that the outer peripheral surface side is N pole, and the biasing permanent magnet 24b on the other side in the axial direction is S pole on the outer peripheral surface side. Has been.

磁束収束用永久磁石２５は、バイアス用永久磁石２４ａ，２４ｂの各中央部分にそれぞれＶ溝２６ａ，２６ｂが形成されるように軸方向に３分割されており、バイアス用永久磁石２４ａの部分に配置されたＶ溝２６aの両側はそれぞれＮ極、バイアス用永久磁石２４ｂの部分に配置されたＶ溝２６ｂの両側はそれぞれＳ極となるように軸方向に着磁されている。そして、このＶ溝２６ａ，２６ｂが、ステータ１０のヨーク１２のギャップ部Ｇ２と対向するように構成されている。なお、Ｖ溝２６ａ，２６ｂの代わりに、矩形状の溝、その他の形状の溝を用いても良い。   The magnetic flux concentrating permanent magnet 25 is divided into three in the axial direction so that the V grooves 26a and 26b are formed in the central portions of the biasing permanent magnets 24a and 24b, respectively, and is disposed in the portion of the biasing permanent magnet 24a. Both sides of the V-groove 26a are magnetized in the axial direction so as to be N-poles, and both sides of the V-groove 26b arranged in the bias permanent magnet 24b are respectively S-poles. The V grooves 26 a and 26 b are configured to face the gap portion G 2 of the yoke 12 of the stator 10. Instead of the V grooves 26a and 26b, rectangular grooves or other shapes may be used.

このようなアキシャル磁気軸受によれば、図３（ａ）に実線矢印で示すように、バイアス用永久磁石２４によって生成されるバイアス磁束が、磁束収束用永久磁石２５によってＶ溝２６ａ，２６ｂの付近に収束させられ、この部分に極めて高い密度の磁束が形成される。この磁束は、Ｖ溝２６ａ，２６ｂの部分とステータ１０側のヨーク１２の軸方向両側の先端との間に強力な磁気吸引力を発生させる。この状態で、ヨーク１２の中央の突極に巻回された制御用巻線１３に同図（ａ）に示すような制御電流を流すと、図中点線矢印で示すような方向の制御磁束が生成され、図中左側の突極では磁束は強められ、図中右側の突極では磁束は弱められる。これにより、左側の突極とＶ溝２６ａとの磁気吸引力が、右側の突極とＶ溝２６ｂとの磁気吸引力に勝り、ロータ２０は、図中白抜き矢印で示すように、左側（Ｌ方向）に移動する。   According to such an axial magnetic bearing, as indicated by the solid line arrow in FIG. 3A, the bias magnetic flux generated by the biasing permanent magnet 24 is generated by the magnetic flux converging permanent magnet 25 in the vicinity of the V grooves 26a and 26b. And a very high density magnetic flux is formed in this portion. This magnetic flux generates a strong magnetic attractive force between the V-grooves 26a and 26b and the axially opposite ends of the yoke 12 on the stator 10 side. In this state, when a control current as shown in FIG. 6A is passed through the control winding 13 wound around the central salient pole of the yoke 12, the control magnetic flux in the direction shown by the dotted arrow in FIG. The magnetic flux is strengthened at the left salient pole in the figure, and the magnetic flux is weakened at the right salient pole in the figure. As a result, the magnetic attraction force between the left salient pole and the V groove 26a is superior to the magnetic attraction force between the right salient pole and the V groove 26b, and the rotor 20 has a left side ( (L direction).

一方、ヨーク１２の中央の突極に巻回された制御用巻線１３に同図（ｂ）に示すような向きの制御電流を流すと、同図（ａ）とは逆向きの図中点線矢印で示すような方向の制御磁束が生成され、図中左側の突極では磁束は弱められ、図中右側の突極では磁束は強められる。これにより、右側の突極とＶ溝２６ｂとの磁気吸引力が、左側の突極とＶ溝２６ａとの磁気吸引力に勝り、ロータ２０は、図中白抜き矢印で示すように、右側（Ｒ方向）に移動する。   On the other hand, when a control current having a direction as shown in FIG. 6B is passed through the control winding 13 wound around the center salient pole of the yoke 12, the dotted line in the figure opposite to that shown in FIG. A control magnetic flux in the direction shown by the arrow is generated, and the magnetic flux is weakened at the left salient pole in the figure, and the magnetic flux is strengthened at the right salient pole in the figure. Thereby, the magnetic attraction force between the right salient pole and the V groove 26b is superior to the magnetic attraction force between the left salient pole and the V groove 26a, and the rotor 20 has the right side ( R direction).

このように、本実施形態のアキシャル磁気軸受によれば、磁束収束用永久磁石２５の存在によって、Ｖ溝２６ａ，２６ｂ付近に、例えば２Ｔ程度の極めて高いバイアス磁束を得ることができ、１００Ｎ程度のアキシャル方向の支持力が得られるという効果を奏する。   As described above, according to the axial magnetic bearing of the present embodiment, an extremely high bias magnetic flux of, for example, about 2T can be obtained in the vicinity of the V grooves 26a and 26b due to the presence of the magnetic flux converging permanent magnet 25. An effect is obtained that a supporting force in the axial direction can be obtained.

なお、上記実施形態では、８つのステータユニット１１をロータ２０の周囲に配置する構成を採用したが、ステータユニット１１の数をいくつにするかは、磁気軸受の大きさやギャップ等に応じて適宜決定すれば良い。このように、ステータ１０を分割構造とすると、ヨーク１２を積層鋼板で製作することができるので、高周波性能を向上させることができる。   In the above embodiment, the configuration in which the eight stator units 11 are arranged around the rotor 20 is adopted. However, the number of the stator units 11 is appropriately determined according to the size of the magnetic bearing, the gap, and the like. Just do it. As described above, when the stator 10 has a divided structure, the yoke 12 can be made of laminated steel plates, so that high frequency performance can be improved.

しかしながら、ステータ１１は、分割構造としなくても構成可能である。
図４は、そのような本発明の第２の実施形態に係るアキシャル磁気軸受の構成を示す断面図である。この実施形態では、ステータ３０が、環状のヨーク３１により構成されている。ヨーク３１の断面は、先の実施形態と同様にＥ字型である。制御用巻線３２は、ヨーク３１の２つの溝にそれぞれ周方向に巻回されている。両方の巻線に互いに異なる方向の電流を流すことにより、先の実施形態と同様の作用効果を得ることができる。 However, the stator 11 can be configured without a divided structure.
FIG. 4 is a sectional view showing the configuration of such an axial magnetic bearing according to the second embodiment of the present invention. In this embodiment, the stator 30 is constituted by an annular yoke 31. The cross section of the yoke 31 is E-shaped as in the previous embodiment. The control winding 32 is wound around the two grooves of the yoke 31 in the circumferential direction. By causing currents in different directions to flow through both windings, it is possible to obtain the same effects as in the previous embodiment.

本実施形態によれば、ステータ３０の構成を更に簡素化することができる。   According to the present embodiment, the configuration of the stator 30 can be further simplified.

本発明の第１の実施形態に係るアキシャル磁気軸受の断面図である。It is sectional drawing of the axial magnetic bearing which concerns on the 1st Embodiment of this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 同実施形態の作用を説明するための要部を示す図である。It is a figure which shows the principal part for demonstrating the effect | action of the embodiment. 本発明の第２の実施形態に係るアキシャル磁気軸受の断面図である。It is sectional drawing of the axial magnetic bearing which concerns on the 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１０，３０…ステータ、１１…ステータユニット、１２，３１…ヨーク、１３，３２…制御用巻線、２０…ロータ、２１…ロータ本体、２３…バックヨーク、２４…バイアス用永久磁石、２５…磁束収束用永久磁石、２６ａ，２６ｂ…Ｖ溝。   DESCRIPTION OF SYMBOLS 10,30 ... Stator, 11 ... Stator unit, 12, 31 ... Yoke, 13, 32 ... Control winding, 20 ... Rotor, 21 ... Rotor body, 23 ... Back yoke, 24 ... Permanent magnet for bias, 25 ... Magnetic flux Permanent magnet for convergence, 26a, 26b ... V-groove.

Claims (4)

ステータと、このステータに磁気力によって非接触状態で支持されて回転するロータとを有しロータの軸方向の位置制御を行うアキシャル磁気軸受において、
前ロータは、
ロータ本体と、
このロータ本体に装着されて前記ロータの径方向に着磁された環状のバイアス用永久磁石と、
このバイアス用永久磁石の外周面に装着されると共に外周面側に周方向に延びる溝を有し、この溝の両側が前記バイアス用永久磁石の外周面に現れる極性と同一極性となるように軸方向に着磁されて前記溝の近傍に磁束集中部を形成する環状の磁束収束用永久磁石と
を有し、
前記ステータは、
前記溝と所定のギャップを介して対向する先端部を有するヨークと、
このヨークに巻回された制御用巻線と
を有する
ことを特徴とするアキシャル磁気軸受。 In an axial magnetic bearing that has a stator and a rotor that is supported by the stator in a non-contact state and rotated by magnetic force and performs axial position control of the rotor,
The front rotor
A rotor body;
An annular biasing permanent magnet mounted on the rotor body and magnetized in the radial direction of the rotor;
A groove is provided on the outer peripheral surface of the biasing permanent magnet and has a groove extending in the circumferential direction on the outer peripheral surface side. An annular magnetic flux concentrating permanent magnet that is magnetized in the direction and forms a magnetic flux concentrating portion in the vicinity of the groove,
The stator is
A yoke having a tip portion facing the groove through a predetermined gap;
An axial magnetic bearing comprising: a control winding wound around the yoke. 前記バイアス用永久磁石は、前記ロータの軸方向の一方の側の外周面を第1極性、他方の側の外周面を第２極性として径方向に着磁され、
前記磁束収束用永久磁石は、前記バイアス用永久磁石の第１極性の部分と第２極性の部分にそれぞれ前記溝としてＶ溝を有し、前記第１極性の部分に配置されたＶ溝の両側はそれぞれ第１極性、前記第２極性の部分に配置されたＶ溝の両側はそれぞれ第２極性となるように軸方向に着磁されたものであり、
前記ステータのヨークは、前記Ｖ溝に対向する部分にそれぞれ周方向に延びる溝を形成した断面Ｅ字型の磁性体からなり、
前記ステータの制御用巻線は、前記ヨークの溝に収容されている
ことを特徴とする請求項１記載のアキシャル磁気軸受。 The permanent magnet for bias is magnetized in the radial direction with the outer peripheral surface on one side in the axial direction of the rotor as the first polarity and the outer peripheral surface on the other side as the second polarity,
The magnetic flux concentrating permanent magnet has V grooves as the grooves in the first polarity portion and the second polarity portion of the bias permanent magnet, and both sides of the V groove arranged in the first polarity portion. Are magnetized in the axial direction so that both sides of the V-grooves arranged in the first polarity and the second polarity are respectively in the second polarity,
The stator yoke is made of a magnetic material having an E-shaped cross section in which grooves extending in the circumferential direction are formed in portions facing the V groove,
The axial magnetic bearing according to claim 1, wherein the control winding of the stator is accommodated in a groove of the yoke. 前記ロータ本体と前記バイアス用永久磁石との間に環状の磁性体からなるバックヨークを設けたことを特徴とする請求項１又は２記載のアキシャル磁気軸受。   The axial magnetic bearing according to claim 1, wherein a back yoke made of an annular magnetic body is provided between the rotor main body and the biasing permanent magnet. 前記ステータは、前記ロータの周囲に配置された複数のステータユニットにより構成され、
前記各ステータユニットは、軸方向と直交する方向に積層された積層鋼板からなるヨークを有する
ことを特徴とする請求項１〜３のいずれか１項記載のアキシャル磁気軸受。 The stator is composed of a plurality of stator units arranged around the rotor,
The axial magnetic bearing according to claim 1, wherein each stator unit has a yoke made of laminated steel plates laminated in a direction orthogonal to the axial direction.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103216527A (en) * 2013-03-15 2013-07-24 浙江大学 Magnetic bearing based on radial rejection and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111609036A (en) * 2020-04-27 2020-09-01 黄尉欢 Magnetic fluid bearing

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JPH05272537A (en) * 1991-03-26 1993-10-19 Ebara Corp Electromagnetic actuator
JP2003314550A (en) * 2002-04-18 2003-11-06 Sankyo Seiki Mfg Co Ltd Magnetic bearing unit
JP2004316756A (en) * 2003-04-15 2004-11-11 Canon Inc Five-axis control magnetic bearing
JP2006162049A (en) * 2004-12-10 2006-06-22 Iwaki Co Ltd Magnetic bearing
JP2008182823A (en) * 2007-01-25 2008-08-07 Edwards Kk Electromagnetic actuator and vacuum pump

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Publication number Priority date Publication date Assignee Title
JPH05272537A (en) * 1991-03-26 1993-10-19 Ebara Corp Electromagnetic actuator
JP2003314550A (en) * 2002-04-18 2003-11-06 Sankyo Seiki Mfg Co Ltd Magnetic bearing unit
JP2004316756A (en) * 2003-04-15 2004-11-11 Canon Inc Five-axis control magnetic bearing
JP2006162049A (en) * 2004-12-10 2006-06-22 Iwaki Co Ltd Magnetic bearing
JP2008182823A (en) * 2007-01-25 2008-08-07 Edwards Kk Electromagnetic actuator and vacuum pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103216527A (en) * 2013-03-15 2013-07-24 浙江大学 Magnetic bearing based on radial rejection and application thereof

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