WO2010136325A2 - Ensemble palier pour un palier magnétique axial sans contact et tube à rayons x pourvu de ce palier - Google Patents

Ensemble palier pour un palier magnétique axial sans contact et tube à rayons x pourvu de ce palier Download PDF

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Publication number
WO2010136325A2
WO2010136325A2 PCT/EP2010/056364 EP2010056364W WO2010136325A2 WO 2010136325 A2 WO2010136325 A2 WO 2010136325A2 EP 2010056364 W EP2010056364 W EP 2010056364W WO 2010136325 A2 WO2010136325 A2 WO 2010136325A2
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
stator
bearing
ray tube
coil
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.)
Ceased
Application number
PCT/EP2010/056364
Other languages
German (de)
English (en)
Other versions
WO2010136325A3 (fr
Inventor
Sven Fritzler
Jan Matschulla
Peter-Klaus Budig
Nils HÜBNER
Marcus Paditz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to CN2010800236226A priority Critical patent/CN102449335A/zh
Publication of WO2010136325A2 publication Critical patent/WO2010136325A2/fr
Publication of WO2010136325A3 publication Critical patent/WO2010136325A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16C39/00—Relieving load on bearings
    • F16C39/06—Relieving load on bearings using magnetic means
    • F16C39/063—Permanent magnets
    • F16C39/066—Permanent magnets with opposing permanent magnets repelling each other
    • 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
    • F16C32/0474—Active magnetic bearings for rotary movement
    • F16C32/0476—Active magnetic bearings for rotary movement with active support of one degree of freedom, e.g. axial magnetic bearings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H01J35/101—Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving
    • H01J35/1017—Bearings for rotating anodes
    • H01J35/103—Magnetic bearings
    • 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
    • F16C2380/00—Electrical apparatus
    • F16C2380/16—X-ray tubes

Definitions

  • the invention relates to a bearing assembly for a contactless magnetic thrust bearing, comprising a rotatable on a common axis relative to each other rotor / stator pair, wherein both rotor side and stator side magnets are provided which generate a magnetic field bearing acting in the axial direction, and between the rotor and stator there is a finite gap, so that rotor and stator do not touch during operation.
  • the invention also relates to an X-ray tube with a vacuum housing and in the vacuum housing located rotary anode, which has at least one magnetic thrust bearing for the rotary anode.
  • bearings are well known and used in conjunction with vacuum environment applications such as the storage of rotors of turbomolecular pumps or rotating anode plates in high dose rate X-ray tubes.
  • vacuum environment applications such as the storage of rotors of turbomolecular pumps or rotating anode plates in high dose rate X-ray tubes.
  • the inventors have recognized that a bearing arrangement of a magnetic thrust bearing for a rotor / stator pair is possible, which on the side of the rotor exclusively permanent magnets, the permanent magnets on the rotor side are arranged opposite and facing each other, to a permanent repulsion between the rotor and to effect stator. At the same time this repulsive force counteracting electromagnets can be arranged on the stator side, which use a part of the rotor as Magnetj och and tighten the rotor controlled and thus allow accurate positioning of the rotor relative to the stator via known control and regulating mechanisms.
  • the inventors propose the improvement of a bearing arrangement for a non-contact magnetic thrust bearing which has a rotor / stator pair rotatable relative to one another on a common axis, wherein both rotor side and stator side magnets are provided, which magnetic field bearing acting in the axial direction and there is a finite gap between the rotor and the stator so that the rotor and the stator do not touch each other.
  • the improvement is brought about by the fact that on the side of the rotor and on the side of the stator, in each case opposite permanent magnets are arranged, the stator-side polarity of which is oriented opposite to the rotor-side polarity, and furthermore on the side of the stator.
  • At least one control and / or controllable electromagnet is arranged, which faces a metallic surface on the side of the rotor, which acts as Magnetj och.
  • rotor and stator oppositely oriented permanent magnets are used, which cause a repulsion between the rotor and stator, wherein the repulsive force extends in the axial direction.
  • electromagnets are used on the stator side, which act with their flow on a rotor-side metallic surface and depending on the strength of the electrically operated magnetic field, the rotor controlled or used on the stator and thus counteract the repulsive forces of the permanent magnets.
  • the permanent magnets may consist of coaxial ring pairs or of a plurality of coaxially arranged magnetic rings.
  • the at least one electromagnet is constructed from at least one coaxial toroid, it being advantageous that the at least one coaxial annular coil has a partial coil for the basic excitation and a partial coil for the control excitation.
  • the partial coil for the basic excitation and / or the partial coil for the control excitation can be electrically connected to one power converter each.
  • the permanent magnets are arranged radially inwardly, while the electromagnets are arranged radially farther outward than the permanent magnets.
  • the inventors also propose an X-ray tube with a vacuum housing and a rotary anode located in the vacuum housing, wherein at least one magnetic thrust bearing is provided for the rotary anode and this is designed at least one thrust bearing in accordance with the invention.
  • the rotor is arranged within the vacuum housing of the X-ray tube and runs in the gap between the rotor and stator, the magnetic flux little influencing and airtight partition.
  • the partition wall that this at least partially consists of a material of the following list: ceramic, stainless steel, plastic, fiber-reinforced plastic, glass.
  • 1 shows a longitudinal section through an inventive contactless magnetic thrust bearing
  • 2 shows embodiment of the magnetic thrust bearing according to
  • FIG. 1 shows a magnetic axial bearing 1 according to the invention, which consists of magnets arranged on the rotor side and on the stator side. On the side of the rotor 2 there are two permanent magnets 4, wherein their orientation is designed so that the magnetic south pole is directed in the direction of the stator.
  • the rotor 2 coaxial with the axis of rotation 6 opposite a stator 3 is arranged, which also has Ü permanent magnets 4, which, however, are arranged opposite to the permanent magnet 4 on the rotor side.
  • a coaxial coil 5 Radially further away from the axis of rotation 6 is located on the stator side of a coaxial coil 5, which can be traversed by a time-varying current.
  • the polarity of the permanent magnet 4, which is of annular design here, is directed counter to the permanent magnet 4, which is likewise designed as a ring magnet, on the rotor side, so that a repelling force arises between the two permanent magnets 4.
  • the coaxial coil 5 generates a magnetic field which is aligned so that in the case of a current flow in the coaxial coil 5, a magnetic field is created, which draws the rotor to the stator.
  • a first coaxial coil can be charged with a base excitation current and a second coaxial coil can be fed with a control excitation current, which is ultimately responsible for the Ab- regulation.
  • a single coil with two different windings instead of two separate coils, wherein the one winding is supplied with the ground excitation current and the other winding with the control excitation current.
  • the arrangement of the magnetic thrust bearing shown here now makes it possible to reduce the rotor by the length of a coaxial arrangement, so that due to the smaller overall length and the natural vibration of the rotor increases and thus the resonance frequencies are also shifted to a higher frequency range.
  • inventive type of axial bearing course with various designs of radial bearings preferably magnetic radial bearings
  • radial bearings preferably magnetic radial bearings
  • heteropolargers, homopolar bearings and unipolar bearings can be used for this purpose.
  • FIG. 3 shows a schematic representation of an inventive X-ray tube 8, consisting of a vacuum housing 9, in which a rotor 2 according to the invention is located, which is equipped at the right end with a ring-shaped permanent magnet 4.
  • annular permanent magnet is also arranged, which, however, with respect to its polarity of the polarity of the rotor-side permanent magnet 4 is opposite.
  • coaxial coil (s) 5 Radially further out to the permanent magnet 4 on the stator side is one or more coaxial coil (s) 5, which can counteract the repulsive force caused by the permanent magnets 4, in the case of a current flow / can.
  • a radial bearing 12 of the turntable bearing rotor 2 is shown.
  • such storage can be configured in a conventional manner as magnetic storage.
  • a partition 10 made of material which is not difficult to magnetize, which ensures that a sufficient vacuum remains in the region of the vacuum housing 9.
  • the stator side Housing additionally designed separable from the vacuum housing 9, it is possible to supply the vacuum housing 9 separately Ar ⁇ particulate.
  • the coil 5 of the stator can be powered by a power converter 14.
  • the vacuum housing 9 of course has an X-ray exit window 13 and a cathode arrangement 11, from which, when a corresponding high voltage is applied, an electron beam strikes the anode surface of the turntable designed as a rotor and generates X-radiation.
  • a bearing assembly of a non-contact magnetic thrust bearing is shown by the invention, which is much shorter than the known prior art bearing assemblies with respect to their length and thus according to the above object makes it possible to produce a rotor, which due to the smaller overall length with respect Natural frequency is shifted upwards relative to the prior art and accordingly also has higher resonance frequencies. This means that it can still be operated at higher speeds in the subcritical speed range.

Landscapes

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

Abstract

L'invention concerne un ensemble palier pour un palier magnétique axial sans contact (1), comportant un ensemble rotor/stator (2,3) tournant l'un par rapport à l'autre autour d'un axe de rotation (6) commun, des aimants étant prévus à la fois côté rotor et côté stator pour générer un logement par champ magnétique agissant dans l'axe, un espace fini séparant le rotor (2) du stator (3) de sorte qu'ils ne se touchent pas. L'invention est caractérisée en ce que côté rotor (2) et côté stator (3) sont disposés des aimants permanents (4) face à face, dont la polarité côté stator est opposée à la polarité côté rotor, et que côté stator (3) est monté au moins un électroaimant commandable et/ou régulable avec une bobine (5), cet électroaimant étant opposé à une surface métallique côté rotor (2) qui agit comme culasse. L'invention porte également sur un tube à rayons X (8) comportant une enceinte sous vide (9) dans laquelle se trouve une anode tournante, ce tube à rayons X comportant au moins un palier magnétique axial (1) du type susmentionné pour l'anode tournante.
PCT/EP2010/056364 2009-05-29 2010-05-10 Ensemble palier pour un palier magnétique axial sans contact et tube à rayons x pourvu de ce palier Ceased WO2010136325A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010800236226A CN102449335A (zh) 2009-05-29 2010-05-10 适用于无接触磁力轴向轴承的轴承结构和包含该轴承的x射线管

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009023363 2009-05-29
DE102009023363.6 2009-05-29

Publications (2)

Publication Number Publication Date
WO2010136325A2 true WO2010136325A2 (fr) 2010-12-02
WO2010136325A3 WO2010136325A3 (fr) 2011-04-07

Family

ID=43223153

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/056364 Ceased WO2010136325A2 (fr) 2009-05-29 2010-05-10 Ensemble palier pour un palier magnétique axial sans contact et tube à rayons x pourvu de ce palier

Country Status (2)

Country Link
CN (1) CN102449335A (fr)
WO (1) WO2010136325A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8054943B2 (en) 2009-12-03 2011-11-08 General Electric Company Magnetic coupler drive for x-ray tube anode rotation
CN102364138A (zh) * 2011-10-12 2012-02-29 西南交通大学 水轮发电机电磁减载轴承
DE102012212133B3 (de) * 2012-07-11 2013-07-25 Siemens Aktiengesellschaft Drehanodenanordnung und Röntgenröhre
TWI494514B (zh) * 2012-05-04 2015-08-01 中原大學 軸向被動式磁浮軸承系統
EP3872835A1 (fr) 2020-02-28 2021-09-01 Siemens Healthcare GmbH Tube à rayons x rotatif

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2523796A (en) * 2014-03-05 2015-09-09 Adaptix Ltd X-ray generator
DE102014204771B4 (de) * 2014-03-14 2017-04-13 Siemens Healthcare Gmbh Röntgenstrahler
CN109026999B (zh) * 2018-10-08 2023-07-25 珠海格力电器股份有限公司 轴向磁悬浮轴承
CN114393223A (zh) * 2022-02-18 2022-04-26 浙江亚微精密机床有限公司 电主轴的转轴无接触的轴向浮动消除结构及电主轴

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7902477A (nl) * 1979-03-30 1980-10-02 Philips Nv Roentgenbuis met een magnetisch gelagerde draaianode.
JPS5941269B2 (ja) * 1980-07-31 1984-10-05 株式会社東芝 回転陽極ｘ線管
JPS5937331A (ja) * 1982-08-25 1984-02-29 Mitsubishi Electric Corp スラスト軸受装置
JPH024024U (fr) * 1988-06-20 1990-01-11
US5543673A (en) * 1993-07-27 1996-08-06 Sundstrand Corporation High performance magnetic bearing
GB2303412B (en) * 1995-07-14 1999-08-11 Glacier Metal Co Ltd Electromagnetic bearing
GB9703685D0 (en) * 1997-02-21 1997-04-09 Glacier Metal Co Ltd Centrifugal separator
US6198803B1 (en) * 1999-08-20 2001-03-06 General Electric Company Bearing assembly including rotating element and magnetic bearings
CN100368696C (zh) * 2002-07-10 2008-02-13 特伯考尔公司 利用永磁体减轻转子-支承系统中推力负荷的装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8054943B2 (en) 2009-12-03 2011-11-08 General Electric Company Magnetic coupler drive for x-ray tube anode rotation
CN102364138A (zh) * 2011-10-12 2012-02-29 西南交通大学 水轮发电机电磁减载轴承
TWI494514B (zh) * 2012-05-04 2015-08-01 中原大學 軸向被動式磁浮軸承系統
DE102012212133B3 (de) * 2012-07-11 2013-07-25 Siemens Aktiengesellschaft Drehanodenanordnung und Röntgenröhre
WO2014009034A1 (fr) 2012-07-11 2014-01-16 Siemens Aktiengesellschaft Système d'anode rotative et tube à rayons x
US9847206B2 (en) 2012-07-11 2017-12-19 Siemens Aktiengesellschaft Rotary anode arrangement and X-ray tube
EP3872835A1 (fr) 2020-02-28 2021-09-01 Siemens Healthcare GmbH Tube à rayons x rotatif

Also Published As

Publication number Publication date
WO2010136325A3 (fr) 2011-04-07
CN102449335A (zh) 2012-05-09

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