JPH02280646A - Magnetic bearing type electric rotary machine - Google Patents
Magnetic bearing type electric rotary machineInfo
- Publication number
- JPH02280646A JPH02280646A JP9881189A JP9881189A JPH02280646A JP H02280646 A JPH02280646 A JP H02280646A JP 9881189 A JP9881189 A JP 9881189A JP 9881189 A JP9881189 A JP 9881189A JP H02280646 A JPH02280646 A JP H02280646A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- rotary shaft
- protective
- rotating shaft
- magnetic bearing
- 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.)
- Pending
Links
- 230000001681 protective effect Effects 0.000 claims abstract description 34
- 239000013013 elastic material Substances 0.000 claims description 5
- 230000035939 shock Effects 0.000 abstract description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 239000006096 absorbing agent Substances 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001875 Ebonite Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
【発明の詳細な説明】
[発明の目的]
(産業上の利用分野)
本発明は回転軸を非接触状態で保持する磁気軸受と、こ
の磁気軸受の非作動時に回転軸を接触状態で保持する保
護軸受とを備えた磁気軸受形回転電機に関する。[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention provides a magnetic bearing that holds a rotating shaft in a non-contact state, and a magnetic bearing that holds the rotating shaft in a contact state when the magnetic bearing is not in operation. The present invention relates to a magnetic bearing type rotating electric machine equipped with a protective bearing.
(従来の技術)
この種の回転電機の従来例を第4図に示してその構成の
概略を述べる。1はフレームで、これの内部中央には固
定子2が配置され、両端部には軸受ブラケット3が固定
されている。4は固定子2に対応する回転子で、これの
中心には回転軸5が固着されている。6は(jす転軸5
を回転子4の両側で非接触で支持するための一対のラジ
アル形磁気軸受で、回転軸5に固着された磁性体7とそ
れを取巻いてフレーム1に固着された固定子8とがら成
る。9は一対の保護軸受で、夫々軸受ブラケット3に設
けられた玉軸受により構成されており1、上述した磁気
軸受6の作動中には、回転軸5はこれらと接触しないよ
うになっている。(Prior Art) A conventional example of this type of rotating electrical machine is shown in FIG. 4, and its configuration will be briefly described. Reference numeral 1 denotes a frame, a stator 2 is disposed at the center of the frame, and bearing brackets 3 are fixed to both ends. 4 is a rotor corresponding to the stator 2, and a rotating shaft 5 is fixed to the center of the rotor. 6 is (j rotation axis 5
A pair of radial magnetic bearings are used to support the rotor 4 on both sides of the rotor 4 in a non-contact manner, and consist of a magnetic body 7 fixed to the rotating shaft 5 and a stator 8 surrounding it and fixed to the frame 1. Reference numeral 9 denotes a pair of protective bearings, each of which is constituted by a ball bearing provided on a bearing bracket 3, and the rotary shaft 5 is prevented from coming into contact with these while the magnetic bearing 6 is in operation.
しかして、回転電機の運転中は磁気軸受6が作動し、回
転軸5は、この磁気軸受6により非接触状態即ち保護軸
受9にも接触しない状態で保持される。一方、回転電機
の停止時又は磁気軸受すの電源遮断時には、磁気軸受6
による非接触状態での保持力がなくなって、回転軸5は
保の軸受9に落下し、この保58軸受9により接触状態
で保持されるようになる。従って、rr!!気軸受6の
電源が遮断された場合でも、回転r4が固定子2に接触
したり、磁気軸受6の磁性体7が固定子8に接触したり
して破損することを未然に防止できる。Thus, during operation of the rotating electrical machine, the magnetic bearing 6 operates, and the rotating shaft 5 is held in a non-contact state, that is, in a state in which it does not contact the protective bearing 9. On the other hand, when the rotating electric machine is stopped or the power to the magnetic bearing is cut off, the magnetic bearing 6
The holding force in the non-contact state is lost, and the rotating shaft 5 falls into the retainer bearing 9, and is held in the contact state by the retainer bearing 9. Therefore, rr! ! Even when the power to the magnetic bearing 6 is cut off, it is possible to prevent damage caused by the rotation r4 coming into contact with the stator 2 or the magnetic body 7 of the magnetic bearing 6 coming into contact with the stator 8.
(発明が解決しようとする課題)
しかしながら、上記構成では、回転電機が高速で運転し
ている場合に、磁気軸受6の7i源が遮断されたりして
磁気軸受6が機能しなくなる等の異常が生じたときに、
負荷の状態によっては回転軸5が急激にラジアル方向に
移動することがあり、このため、回転軸5と保護軸受9
とが衝突して損傷してしまう虞があるという問題があっ
た。(Problem to be Solved by the Invention) However, with the above configuration, when the rotating electric machine is operating at high speed, abnormalities such as the 7i source of the magnetic bearing 6 being cut off and the magnetic bearing 6 not functioning may occur. When it occurs,
Depending on the load condition, the rotating shaft 5 may suddenly move in the radial direction, and as a result, the rotating shaft 5 and the protective bearing 9
There was a problem in that there was a risk of damage due to collision.
そこで、本発明の目的は、磁気軸受の異常時にも、回転
軸と保護軸受との衝突による損傷を未然に防止すること
ができる磁気軸受形回転電機を提供するにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic bearing type rotating electric machine that can prevent damage caused by collision between a rotating shaft and a protective bearing even when the magnetic bearing is abnormal.
[発明の構成]
(課題を解決するための手段)
本発明は、回転軸を回転子の両側で非接触状態で保持す
る磁気軸受、及びこの磁気軸受の非作動時に前記回転軸
を前記回転子の両側で接触状態で保持する保護軸受とを
備えた磁気軸優形回転電機を対象とし、前記保護軸受の
前記回転軸と接触する部分に弾性材製の緩衝体を設けた
ところに特徴を有する。[Structure of the Invention] (Means for Solving the Problems) The present invention provides a magnetic bearing that holds a rotating shaft on both sides of a rotor in a non-contact state, and a magnetic bearing that holds the rotating shaft on both sides of a rotor in a non-contact state, and when the magnetic bearing is not in operation, the rotating shaft is held on both sides of the rotor. The present invention is directed to a magnetic shaft-dominant rotating electrical machine equipped with a protective bearing held in contact on both sides of the rotating shaft, and is characterized in that a buffer made of an elastic material is provided at a portion of the protective bearing that contacts the rotating shaft. .
(作用)
回転電機が高速で運転している際に、万−電源遮断等に
より磁気軸受が機能しなくなって回転軸がラジアル方向
に急激に移動したとする。すると、回転軸は保護軸受に
落下し、保護軸受に設けられた弾性材製の緩衝体と接触
する。これにより、回転軸と保護軸受との衝突時の衝撃
が緩衝体により吸収され、回転軸及び保護軸受が損傷す
ることなく保護軸受に保持される。(Operation) Suppose that while a rotating electric machine is operating at high speed, the magnetic bearing stops functioning due to power cut-off or the like, and the rotating shaft suddenly moves in the radial direction. Then, the rotating shaft falls onto the protective bearing and comes into contact with a shock absorber made of an elastic material provided on the protective bearing. As a result, the shock caused by the collision between the rotating shaft and the protective bearing is absorbed by the buffer, and the rotating shaft and the protective bearing are held by the protective bearing without being damaged.
(実施例)
以下、本発明の第1の実施例について第1図及び第2図
を参照して説明する。(Example) Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 and 2.
まず、全体の構成を示す第1図において、11はフレー
ムで、この内部中央には固定子12が配置され、両端部
には軸受ブラケット13が固定されている。14は固定
子12に対応する回転子で、これの中心には回転軸15
が固着されている。16は回転軸15を回転子14の両
側で非接触で支持するためのラジアル形の一対の磁気軸
受で、回転軸15に固着された磁性体17とそれを取巻
いてフレーム11に固むされた固定子18とがら成る。First, in FIG. 1 showing the overall structure, 11 is a frame, a stator 12 is disposed at the center of the frame, and bearing brackets 13 are fixed to both ends. 14 is a rotor corresponding to the stator 12, and a rotating shaft 15 is located at the center of this rotor.
is fixed. Reference numeral 16 denotes a pair of radial magnetic bearings for supporting the rotating shaft 15 on both sides of the rotor 14 in a non-contact manner. and a stator 18.
19は各磁気軸受16の近くに位置してフレーム11に
設けられた回転軸位置検出器で、これは回転軸15の位
置を検出してそれが固定子18の中央に位置するように
磁気軸受16の固定子18の励磁を制御するためのもの
である。19 is a rotating shaft position detector located near each magnetic bearing 16 and provided on the frame 11, which detects the position of the rotating shaft 15 and detects the position of the rotating shaft 15 so that it is located at the center of the stator 18. This is for controlling the excitation of the 16 stators 18.
20は保護軸受で、これらは夫々軸受ブラケット13中
央を開口して設けられた収納部13aに固定されており
、回転?ll115の両端部を上記磁気軸受]6の非作
動時に接触して支持するようになっている。そして、詳
細には第2図に示すように構成されている。即ち、保護
軸受20部分を拡大して示す第2図において、21は玉
軸受で、その外輪21aは軸受ブラケット13の収納部
13aに嵌合され、軸受ブラケット13と軸受押さえ2
2とにより挟むようにして固定されている。23は玉軸
受21の内輪21bにIIX aされたリングで、その
内周側に設けられた溝部32 aに弾性材製例えば硬質
ゴム製の緩衝体24が嵌め込み固定され、回転軸15と
はこれらの緩衝体24と接触するようになっている。そ
して、前記回転軸15のうち保護軸受20に対応する両
端部分は段付状に径小となっている。Reference numeral 20 denotes protective bearings, each of which is fixed in a storage section 13a provided by opening the center of the bearing bracket 13, and is rotatable. Both ends of the magnetic bearing 115 are in contact with and supported when the magnetic bearing [6] is not in operation. In detail, it is configured as shown in FIG. That is, in FIG. 2, which shows an enlarged view of the protective bearing 20, 21 is a ball bearing, the outer ring 21a of which is fitted into the housing part 13a of the bearing bracket 13, and the bearing bracket 13 and the bearing retainer 2.
2 and are fixed in a sandwiched manner. Reference numeral 23 denotes a ring attached to the inner ring 21b of the ball bearing 21, and a buffer body 24 made of an elastic material, for example, hard rubber, is fitted and fixed in a groove 32a provided on the inner circumferential side of the ring. The shock absorber 24 is brought into contact with the shock absorber 24 of the Both end portions of the rotating shaft 15 corresponding to the protective bearings 20 have a stepped shape with a smaller diameter.
さて、上記構成において、運転中は磁気軸受16により
回転軸15が非接触で支持され安定した高速回転が行わ
れる。このような回転中、万一磁気軸受1bの電源が遮
断される等の事故が発生すると、負荷の状態によっては
回転軸15が急激にラジアルノブ向に移動することがあ
る。すると、回転軸]5は保護軸受20の緩衝体24と
衝突する。しかしながら、このときの衝撃は緩衝体の弾
性変形により吸収されるので、回転軸15及び保護軸受
20の玉軸受21は衝撃による損傷が発生することなく
、回転軸15は保護軸受2oにより保持される。Now, in the above configuration, during operation, the rotating shaft 15 is supported without contact by the magnetic bearing 16, and stable high-speed rotation is performed. During such rotation, if an accident such as power interruption of the magnetic bearing 1b occurs, the rotating shaft 15 may suddenly move toward the radial knob depending on the load condition. Then, the rotating shaft ] 5 collides with the buffer body 24 of the protective bearing 20 . However, since the impact at this time is absorbed by the elastic deformation of the buffer, the rotating shaft 15 and the ball bearing 21 of the protective bearing 20 are not damaged by the impact, and the rotating shaft 15 is held by the protective bearing 2o. .
このように本実施例によれば、磁気軸受16の電源遮断
等の異常時に回転軸15がラジアル方向に移動して玉軸
受21の内輪21bに衝突しても、その衝撃を緩衝体2
4により吸収することができる。これにより、回転軸]
5及び玉軸受21の損傷事故を未然に防止することがで
きる。According to this embodiment, even if the rotating shaft 15 moves in the radial direction and collides with the inner ring 21b of the ball bearing 21 during an abnormality such as power cut off of the magnetic bearing 16, the impact is absorbed by the shock absorber 2.
4 can be absorbed. This allows rotation axis]
5 and ball bearing 21 can be prevented from occurring.
第3図は本発明の第2の実施例を示すもので、以下第1
の実施例と異なる部分についてのみ説明する。FIG. 3 shows a second embodiment of the present invention.
Only the parts that are different from the embodiment will be explained.
即ち、25は第1の実施例における保護軸受2Uに代え
て設けた保護軸受で、玉軸受26の内輪26bには2条
の溝部26c、26cが設けられ、この溝部26c
26cに直接緩衝体27.27が咲め込み固定された状
態でfX?成されている。That is, 25 is a protective bearing provided in place of the protective bearing 2U in the first embodiment, and the inner ring 26b of the ball bearing 26 is provided with two grooves 26c, 26c.
With the buffer body 27.27 inserted directly into 26c and fixed, fX? has been completed.
従って、このような第2の実施例によっても第1の実施
例と同様の効果を得ることができる。Therefore, the second embodiment can also provide the same effects as the first embodiment.
尚、本発明は上記各実施例に限定されるものではなく、
各保護軸受は2pI以上の玉軸受により構成しても良い
等、要旨を逸脱しない範囲内で種々変形して実施するこ
とができるものである。Note that the present invention is not limited to the above embodiments,
Each protective bearing may be constructed with a ball bearing of 2 pI or more, and various modifications can be made without departing from the scope of the invention.
[発明の効果]
以上述べたように、本発明は、保護軸受の回転軸と接触
する部分に弾性材製の緩衝体を設けてフレーム側に設け
るようにしたから、磁気軸受の異常時にも回転軸の衝突
による回転軸及び保護軸受の損傷を未然に防止すること
ができるという優れた効果を奏するものである。[Effects of the Invention] As described above, in the present invention, since a shock absorber made of an elastic material is provided on the frame side at the portion of the protective bearing that comes into contact with the rotating shaft, rotation can be prevented even when an abnormality occurs in the magnetic bearing. This has the excellent effect of preventing damage to the rotating shaft and the protective bearing due to shaft collision.
第1図および第2図は本発明の第1の実施例を示し、第
1図は全体の断面図、第2図は要部の拡大断面図、第3
図は本発明の第2の実施例を示す第2図相当図、第4図
は従来例を示す第1図目当図である。
図面中、11はフレーム、]3は軸受ブラケット、14
は回転子、15は回転軸、16は磁気軸受、20.25
は保護軸受、21.26は玉軸受、23はリング、24
.27は緩衝体である。
代理人 弁理士 則 近 憲 右
同 第 子 丸 健第 1 図
鳥3図
第 2 図
第 4 図1 and 2 show a first embodiment of the present invention, in which FIG. 1 is an overall sectional view, FIG. 2 is an enlarged sectional view of main parts, and FIG.
The figure is a view corresponding to FIG. 2 showing a second embodiment of the present invention, and FIG. 4 is a view equivalent to FIG. 1 showing a conventional example. In the drawing, 11 is a frame, ] 3 is a bearing bracket, 14
is a rotor, 15 is a rotating shaft, 16 is a magnetic bearing, 20.25
is a protective bearing, 21.26 is a ball bearing, 23 is a ring, 24
.. 27 is a buffer body. Agent Patent Attorney Norihiro Chika Kendai No. 1 Figure Tori Figure 3 Figure 2 Figure 4
Claims (1)
軸受と、この磁気軸受の非作動時に前記回転軸を前記回
転子の両側で接触状態で保持する保護軸受とを備えたも
のにおいて、前記保護軸受の前記回転軸と接触する部分
に弾性材製の緩衝体を設けたことを特徴とする磁気軸受
形回転電機。1. A magnetic bearing that holds the rotating shaft on both sides of the rotor in a non-contact state, and a protective bearing that holds the rotating shaft on both sides of the rotor in a contact state when the magnetic bearing is not in operation. . A magnetic bearing type rotating electrical machine, characterized in that a buffer made of an elastic material is provided at a portion of the protective bearing that comes into contact with the rotating shaft.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9881189A JPH02280646A (en) | 1989-04-20 | 1989-04-20 | Magnetic bearing type electric rotary machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9881189A JPH02280646A (en) | 1989-04-20 | 1989-04-20 | Magnetic bearing type electric rotary machine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02280646A true JPH02280646A (en) | 1990-11-16 |
Family
ID=14229716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9881189A Pending JPH02280646A (en) | 1989-04-20 | 1989-04-20 | Magnetic bearing type electric rotary machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02280646A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5977677A (en) * | 1996-06-26 | 1999-11-02 | Allison Engine Company | Combination bearing for gas turbine engine |
JP2011012690A (en) * | 2009-06-30 | 2011-01-20 | Yaskawa Electric Corp | Magnetic bearing device and vacuum pump with the same |
CN111396459A (en) * | 2020-03-27 | 2020-07-10 | 江苏理工学院 | Manual centre gripping formula protection bearing device |
WO2020196429A1 (en) * | 2019-03-27 | 2020-10-01 | ダイキン工業株式会社 | Bearing structure |
CN111894978A (en) * | 2020-07-22 | 2020-11-06 | 南通理工学院 | Plane support active magnetic suspension device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63157641A (en) * | 1986-12-19 | 1988-06-30 | Agency Of Ind Science & Technol | Uniaxial control type magnetic bearing device |
-
1989
- 1989-04-20 JP JP9881189A patent/JPH02280646A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63157641A (en) * | 1986-12-19 | 1988-06-30 | Agency Of Ind Science & Technol | Uniaxial control type magnetic bearing device |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5977677A (en) * | 1996-06-26 | 1999-11-02 | Allison Engine Company | Combination bearing for gas turbine engine |
JP2011012690A (en) * | 2009-06-30 | 2011-01-20 | Yaskawa Electric Corp | Magnetic bearing device and vacuum pump with the same |
WO2020196429A1 (en) * | 2019-03-27 | 2020-10-01 | ダイキン工業株式会社 | Bearing structure |
CN113423961A (en) * | 2019-03-27 | 2021-09-21 | 大金工业株式会社 | Bearing structure |
US11319965B2 (en) | 2019-03-27 | 2022-05-03 | Daikin Industries, Ltd. | Bearing structure |
CN111396459A (en) * | 2020-03-27 | 2020-07-10 | 江苏理工学院 | Manual centre gripping formula protection bearing device |
CN111894978A (en) * | 2020-07-22 | 2020-11-06 | 南通理工学院 | Plane support active magnetic suspension device |
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