CA2310191A1 - Mounting of rotors of generators in a magnetic field - Google Patents

Mounting of rotors of generators in a magnetic field Download PDF

Info

Publication number
CA2310191A1
CA2310191A1 CA002310191A CA2310191A CA2310191A1 CA 2310191 A1 CA2310191 A1 CA 2310191A1 CA 002310191 A CA002310191 A CA 002310191A CA 2310191 A CA2310191 A CA 2310191A CA 2310191 A1 CA2310191 A1 CA 2310191A1
Authority
CA
Canada
Prior art keywords
rotor
magnetic bearing
mounting
bearing
rotors
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.)
Abandoned
Application number
CA002310191A
Other languages
French (fr)
Inventor
Kamil Matyscak
Daniel Schafer
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.)
General Electric Switzerland GmbH
Original Assignee
ABB Alstom Power Switzerland Ltd
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 ABB Alstom Power Switzerland Ltd filed Critical ABB Alstom Power Switzerland Ltd
Publication of CA2310191A1 publication Critical patent/CA2310191A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00Bearings not otherwise provided for
    • F16C32/04Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406Magnetic bearings
    • F16C32/044Active magnetic bearings
    • F16C32/0474Active magnetic bearings for rotary movement
    • F16C32/0485Active magnetic bearings for rotary movement with active support of three degrees of freedom
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00Bearings not otherwise provided for
    • F16C32/04Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406Magnetic bearings
    • F16C32/044Active magnetic bearings
    • F16C32/0474Active magnetic bearings for rotary movement
    • F16C32/0489Active magnetic bearings for rotary movement with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing
    • F16C32/0491Active magnetic bearings for rotary movement with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing with electromagnets acting in axial and radial direction, e.g. with conical magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08Structural association with bearings
    • H02K7/09Structural association with bearings with magnetic bearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00Application independent of particular apparatuses
    • F16C2300/30Application independent of particular apparatuses related to direction with respect to gravity
    • F16C2300/34Vertical, e.g. bearings for supporting a vertical shaft
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00Electrical apparatus
    • F16C2380/26Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00Bearings not otherwise provided for
    • F16C32/04Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406Magnetic bearings
    • F16C32/0408Passive magnetic bearings
    • F16C32/0436Passive magnetic bearings with a conductor on one part movable with respect to a magnetic field, e.g. a body of copper on one part and a permanent magnet on the other part
    • F16C32/0438Passive magnetic bearings with a conductor on one part movable with respect to a magnetic field, e.g. a body of copper on one part and a permanent magnet on the other part with a superconducting body, e.g. a body made of high temperature superconducting material such as YBaCuO

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Superconductive Dynamoelectric Machines (AREA)

Abstract

The present invention relates to an arrangement for the mounting of rotors of generators, in particular hydrogenerators, in a magnetic field. In this case, the mounting is effected via at least one magnetic bearing, which is arranged in the region of the rotor rim and the pole windings. As a result, the force due to the weight of the rotor is picked up directly at the point of origin. The at least one magnetic bearing may consist of either a separate radial bearing and a separate thrust bearing or a combination of radial and thrust bearings. The at least one magnetic bearing may be arranged both above and below the rotor and directs the force due to the weight into the foundation. Due to the use of magnetic bearings, the overall efficiency is increased on account of a reduction in bearing losses.
In addition, the rotor may be designed more freely; the compactness required hitherto is no longer absolutely necessary.

Description

Mounting of rotors of generators in a magnetic field The invention relates to the field of generators.
It concerns the mounting of rotors of generators, in particular hydrogenerators, in a magnetic field.
In hydrogenerators, the rotor is usually held and positioned in hydrodynamic bearings. These bearings are radial guide bearings and combined thrust/radial oil bearings and are affected by friction losses. Such a conventional arrangement is shown in Fig. 3. In this case, 31 designates a radial guide bearing and 32 designates a combined thrust/radial oil bearing.
For reasons of environmental protection - namely, for example, on account of the setup in a nature conservation region or underwater in rivers, in which the escaping oil in the event of a leakage in the oil bearing would lead to environmental problems which are difficult to foresee - and also for reasons of a reduction in size of the requisite bearings, three small machines, water turbines and generators, of which one had a rotor weight of 14 tonnes, were hitherto equipped with active magnetic bearings. In this case, in the abovementioned machine, the oil bearings used hitherto, that is the hydrodynamic mounting, were partly or completely replaced by magnetic bearings in the same position.
In "Applications and Performance of Magnetic Bearing for Water Turbine and Generator" by K. Yamaishi in "Advancements in bearing and seal technologies", 1996, the abovementioned machine, inter alia, is disclosed in detail. In particular, a machine is described which is located in the Fuji-Hakone-Izu National Park and in which only magnetic bearings were used. The rotor of this machine has a shaft length of 10 m and a weight of 14 tonnes. In addition to the exclusive use of magnetic bearings, an electrically driven servomotor was used in this case instead of a conventional oil servomotor. Fig. 4 shows this machine and the arrangement of the respective magnetic bearings. In this case, the four conventionally used radial oil bearings and one thrust oil bearing were replaced by three radial magnetic bearings and one thrust magnetic bearing, namely a radial/thrust top generator bearing 41, a radial bottom generator bearing 42 for a generator 45, and a radial water-turbine bearing 44 for a water turbine 40. In addition, an auxiliary bearing 43 is also formed. Compared with conventional oil bearings, the bearing rigidity was reduced by half, but the machine can in any case be operated at a speed lower than the initial critical speed. In addition, in contrast to the machine mounted on oil bearings, control of all the magnetic bearings independently of one another is possible on account of the very long and flexible shaft of the water turbine 40 and the generator 45.
However, magnetic bearings as replacement for oil bearings have only been successfully realized in such small machines described above up to a maximum rotor weight of 14 tonnes. In this case, straight substitution of the oil bearings for magnetic bearings was effected. However, such a concept has not yet been realized so far in the case of large machines.
The aim of the present invention is therefore to design a mounting for a rotor in a magnetic field, by means of which mounting the friction losses in the rotor mounting can be reduced and which is also suitable in particular for large plants having a rotor weight from about 800 tonnes.
According to the invention, this object is achieved by the measures specified in patent claim 1.
Further advantageous refinements and developments of the invention are specified in the subclaims.
Due to the mounting according to the invention, the rotor design can be simplified, the rotor can be of lighter construction and the oil system is omitted. In addition, due to the configuration according to the invention, the bearing losses become smaller, so that the overall efficiency of the plant increases.
Furthermore, it is possible to electrically brake the rotor in an emergency.
The invention is explained in more detail below with reference to embodiments shown in the drawing, in which:
Fig. 1 shows a first exemplary embodiment of the rotor mounting according to the invention, Fig. 2 shows a further exemplary embodiment of the rotor mounting according to the invention, and Fig. 3 shows a representation of a conventional rotor mounting with oil bearings, Fig. 4 shows a representation of a conventional rotor mounting for small machines having a magnetic mounting, Fig. 5 shows a representation of a conventional radial magnetic bearing, Fig. 6 shows a representation of a conventional thrust magnetic bearing, and Fig. 7 shows a schematic representation of a conventional control system for magnetic bearings.
Magnetic mountings according to the invention for rotors, in which friction losses can be substantially reduced and which can also be used in large plants having rotors from about 800 tonnes, are shown in Figures 1 and 2.
First of all, however, the construction of magnetic bearings which are already known will be described with reference to Figures 5 and 6. Such magnetic bearings are produced, for example, by the "Societe de Mecanique Magnetique" and are sold under the designation "ACTIDYNE" magnetic bearings.
An active magnetic bearing consists of two separate parts, namely the bearing itself (Fig. 5 or Fig. 6) and the electronic control system (Fig. 7). A
distinction is made between three types of bearing: the radial bearing, the thrust bearing and the catch bearing. Only the radial bearing and the thrust bearing will be described in more detail below with reference to Fig. 5 and Fig. 6 respectively.
A radial bearing shown in Fig. 5 consists of a rotor 52, which is made with ferromagnetic laminations and is held in position by magnetic fields. These fields are formed by electromagnets 53, which are arranged in the stator 51. The rotor 52 is held in the levitated state without contacting the stator 51, and an air gap s is obtained between rotor 52 and stator 51. The rotor position is monitored by sensors 54, which continuously indicate any deviation from the normal position, i.e. a deviation in the width of the air gap s from a preset value, and deliver corresponding signals which conduct current to the electromagnets 53 via a servosystem in order to bring the rotor 52 back into the normal position. Reference numeral 56 designates an additionally formed catch bearing, in which an air gap s/2 is maintained.
A thrust bearing shown in Fig. 6 is based on the same principle as the radial bearing according to Fig.
5. The rotor 62 consists of a disk-type armature perpendicular to the axis of rotation and of electromagnets 63 opposite, which are formed in the stator 61. A position sensor 64 is often arranged at the end of the shaft, since no shaft movement is to occur here, and detects the width of an air gap E
between rotor 62 and stator 61. A deviation from a predetermined value for s leads to current being directed to the electromagnets 63 for the correction of the rotor position. A catch bearing 66 is shown here too.
A conventional electronic control system, which is shown schematically in Fig. 7, for such active magnetic bearings according to Fig. 5 and Fig. 6 comprises an electronic unit 70 having an electronic signal-processing system 72 and power amplifiers 73. The electronic signal-processing system 72 compares a signal 78 from a position sensor 77 with a reference signal 71 which defines a nominal rotor position. The differential signal obtained is transmitted to a 5 processor, which in turn then transmits control signals to the power amplifiers 73, which supply the electromagnets 76 of the bearing 80 with energy. The power amplifiers 73 supply the electromagnets 76 of the bearing 80 with the energy which is required in order to build up a magnetic field, which acts on the rotor 74, so that the rotor 74 levitates with a certain air gap s over the stator 75. The amplifier power depends on the maximum force of the electromagnets 76, the air gap s between rotor 74 and stator 75, and the reaction time of the servosystem, i.e. the speed with which these forces have to be changed if they are confronted with a disturbance on account of a change in load.
Factors which prove to be an advantage for the use of magnetic bearings in machines having long shafts, in particular in large turbogenerator installations, are the omission of the lubricant circuits and their accessories, the avoidance of the associated risks and the maintenance costs, the reduction in the losses (by more than a factor of 10), which permits power generation over the service life of the machine of several MW, the possibility of using the bearings directly in the steam flow without seals, the magnetic orientation of the bearings, the balancing in situ at full speed, the monitoring and control of the dynamic behavior of the shaft system when passing through critical speeds, the absence of vibrations and the continuous monitoring of the measured values, and the improvement in availability.
With the previous intention to use magnetic bearings instead of oil bearings, which was also realized for small machines, one type of bearing was merely replaced by the other type having the associated advantages. As with the previous bearing arrangements with oil bearings, the force due to the weight was consequently transmitted through the shaft into the thrust bearing, so that a force diversion took place.
In addition, the rotor had to be of compact design in order to effectively realize this force diversion.
However, for machines with heavy rotors, this embodiment could not be readily applied. This is because it proved to be disadvantageous with this procedure that the weight of the "heavy" rotor had first to be picked up from its points of concentration and diverted via the shaft to the respective bearing:
The present invention starts here. In contrast to magnetic mountings realized hitherto in the prior art, in which only the oil bearings at the shaft were replaced by magnetic bearings at the shaft, a completely different arrangement of the magnetic bearings is effected in the case of the arrangement according to the invention. This is because the magnetic mounting is effected in the region of the heavy pole windings and the rotor rim, i.e. the force due to the weight is picked up directly at the point of origin, where it is concentrated. Such a mounting has not been known hitherto either in the case of conventional oil bearings or from the limited use of magnetic mounting. The force due to the weight is drawn off into the foundation in the arrangement according to the invention of the magnetic bearings according to the principle of the active magnetic mounting. This permits a simpler design of the rotor; with the application of this mounting principle, the rotor may now also extend in width and a compact rotor construction is no longer required.
In the arrangement according to the invention with the use of magnetic bearings 4, 5, 7, the force due to the weight may be transmitted either electromagnetically in a conventional manner, electromagnetically in combination with permanent magnets, by means of superconducting coils for electromagnets or in a passive superconducting manner while utilizing the Meissner-Ochsenfeld effect.
To this end, magnet coils may be designed and arranged as shown in Fig. 1 or Fig. 2.
Fig. 1 shows a first exemplary embodiment of the rotor mounting according to the invention, in which a rotor 2 which consists of a shaft 3 and a rotor rim 8 with pole windings 9 is formed. The mounting of the rotor 2 is effected via two magnet coils in each case, of which one monitors the radial position (the concentric position of the rotor in the axis ) and thus constitutes the magnetic bearing 4 serving as guide or radial bearing. The other magnet coil, which forms the magnetic bearing 5, directly absorbs the force due to the weight and therefore functions as thrust bearing.
To this end, a number of permanent magnets, for example, are arranged on the rotor, and located opposite these permanent magnets on the stator 1 are electromagnets, via which or via the supply of current to them the mounting, in particular the distances and positions between rotor 2 and stator 1, can be controlled.
Alternatively, instead of the number of permanent magnets, electromagnet coils as well as a multiplicity of superconducting coils may likewise be used. If superconducting coils are used, powerful permanent magnets are attached to the rotor 2. Superconductors are arranged opposite these permanent magnets on the stator 1. These superconductors are either superconductors which require cooling in a nitrogen bath or superconductors which permit the superconduction even at room temperature. Such last-mentioned superconductors considerably simplify the construction on account of the omission of the cooling.
According to the invention, the rotor 2 is held concentrically, i.e. in the axis, by means of the magnetic bearing 4 of the rotor 2, so that a simple correction of its position and orientation relative to the stator 1 can be realized via the activation of the electromagnets.
However, it is not necessary to form thrust and radial bearings separately from one another as shown in Fig. 1, but rather a combined coil may also be used instead of them as shown in Fig. 2. This electromagnet is then arranged on the stator 1 in such a way that, by means of said electromagnet in combination with permanent magnets, electromagnets or superconducting coils opposite it on the rotor, the radial and thrust bearings normally arranged at right angles to one another are replaced by a magnetic bearing 7 designed as a combined bearing. This electromagnet, in interaction with its opposite magnet portion in the stator 1, then directly absorbs the forces acting on the magnetic bearing 7 shown in Fig. 2.
Furthermore, on account of the use of magnetic bearings, the design of electrical machines with rotors may be made more flexible. On the one hand, as mentioned above, the rotor may be designed to be less compact and so as to extend in width, and, on the other hand, the magnet coils for the mounting may be arranged not only in the bottom rotor region, as shown in Figs.
1 and 2 and as hitherto predetermined by the use of oil bearings, but also above the rotor. This is possible owing to the fact that the force due to the weight may also be transmitted upward by the magnetic bearings, which was not possible in the case of oil bearings. In addition, in contrast to the conventional arrangement, the force due to the weight may also act on a separate supporting ring or directly on the rotor chain.
In addition, by the use of magnetic bearings arranged according to the invention as shown in Figures 1 and 2, it is now possible, in contrast to conventional rotors of hydrogenerators, to electrically brake the rotor in an emergency. To this end, there is no need to install an additional braking device, such as, for example, a hydraulic/pneumatic cylinder normally used for braking the last 20~ of the speed.
This braking device, which is normally required separately, can now be replaced by the magnetic bearing arrangement. Braking can be carried out in a controlled manner by controlling the energy supply and thus the bearing force of the electromagnet arrangement used by the magnetic force being controlled in such a way that the rotating rotor mass is braked.
In addition, the bearing losses of the magnetic bearings used according to the invention are less than with the conventional use of hydrodynamic bearings, so that the overall efficiency of the plant increases.
Therefore the loss of electrical energy can be reduced and the construction of the rotor can be substantially simplified by the use and arrangement according to the invention of magnetic bearings.

Claims (8)

1. An arrangement for the mounting of rotors of generators, in particular hydrogenerators, in a magnetic field, a rotor (2) having a shaft (3) and at least one rotor rim (8) with pole windings (9), characterized in that at least one magnetic bearing (4, 5; 7) is formed for the mounting of the rotor (2) of a generator, the magnetic bearing (4, 5; 7) being arranged in the region of at least one rotor rim (8) and the pole windings (9), so that the force due to the weight of the rotor (2) is picked up directly at the point of origin.
2. The arrangement for the mounting of rotors as claimed in claim 1, characterized in that the at least one magnetic bearing (4, 5) comprises a thrust magnetic bearing (5) for directly absorbing the force due to the weight and a radial magnetic bearing (4) for monitoring the radial position, the thrust magnetic bearing and the radial magnetic bearing being arranged at right angles to one another, and the radial magnetic bearing (4) running parallel to the shaft of the rotor (2), whereas the thrust magnetic bearing (5) is formed perpendicularly to the longitudinal direction of the shaft.
3. The arrangement for the mounting of rotors as claimed in claim 1, characterized in that the at least one magnetic bearing (7) performs the function of a radial magnetic bearing and a thrust magnetic bearing in one element, in which case the at least one magnetic bearing (7) is arranged at a preset angle to the surface of the longitudinal direction of the shaft of the rotor (2), and as a result both the axial and radial positions of the rotor (2) can be controlled by means of this magnetic bearing (7).
4. The arrangement for the mounting of rotors as claimed in one of claims 1 to 3, characterized in that the at least one magnetic bearing (4, 5; 7) is designed to be purely electromagnetic, is designed to be electromagnetic in combination with permanent magnets, is formed from superconducting coils for electromagnets or is designed so as to be superconducting in a passive manner.
5. The arrangement for the mounting of rotors as claimed in one of claims 1 to 4, characterized in that the at least one magnetic bearing (4, 5; 7) has a first electromagnet coil, arranged on the stator (1) as one half of a radial and/or thrust bearing, and a further second electromagnet coil, a permanent magnet or a superconducting coil, arranged as a second half of the radial and/or thrust bearing on the rotor directly opposite this first electromagnet coil.
6. The arrangement for the mounting of rotors as claimed in one of claims 1 to 5, characterized in that the at least one magnetic bearing (4, 5; 7) can be additionally used for braking the rotor (2).
7. The arrangement for the mounting of rotors as claimed in one of claims 1 to 6, characterized in that the at least one magnetic bearing (4, 5; 7) is arranged above the rotor (2).
8. The arrangement for the mounting of rotors as claimed in one of claims 1 to 6, characterized in that the at least one magnetic bearing (4, 5; 7) is arranged below the rotor (2).
CA002310191A 1999-05-31 2000-05-29 Mounting of rotors of generators in a magnetic field Abandoned CA2310191A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924852A DE19924852A1 (en) 1999-05-31 1999-05-31 Storage of rotors of generators in a magnetic field
DE19924852.4 1999-05-31

Publications (1)

Publication Number Publication Date
CA2310191A1 true CA2310191A1 (en) 2000-11-30

Family

ID=7909733

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002310191A Abandoned CA2310191A1 (en) 1999-05-31 2000-05-29 Mounting of rotors of generators in a magnetic field

Country Status (7)

Country Link
EP (1) EP1058368A2 (en)
JP (1) JP2001008406A (en)
CN (1) CN1275830A (en)
BR (1) BR0002533A (en)
CA (1) CA2310191A1 (en)
DE (1) DE19924852A1 (en)
RU (1) RU2000113791A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8466591B2 (en) 2009-09-10 2013-06-18 Statoil Asa Bearing system for high speed rotary machine in a sub sea environment

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10032913C2 (en) * 2000-07-06 2002-11-07 Draeger Medical Ag Gas delivery unit for a ventilation system
EP1227254A1 (en) 2001-01-24 2002-07-31 ALSTOM (Switzerland) Ltd Thrust bearing for a generator
CN100359194C (en) * 2003-10-16 2008-01-02 张鑫 Magnetic drag reduction bearing
DE602005025423D1 (en) * 2005-10-24 2011-01-27 Chuy-Nan Chio BEARING ELECTROMAGNETIC SUSPENSION
DE102007036692A1 (en) 2006-09-22 2008-03-27 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan
DE102008050832A1 (en) * 2008-10-08 2010-04-22 Pro Diskus Ag Storage device for a rotor and a shaft for an electric machine
KR101568422B1 (en) * 2009-05-06 2015-11-12 주식회사 포스코 Magnetic bearing device for supporting roll shaft
CN102507120B (en) * 2011-11-18 2014-02-26 上海交通大学 Generator rotor unbalance magnetic tension testing bench supported by sliding bearings
JP6021048B2 (en) * 2012-01-23 2016-11-02 パナソニックIpマネジメント株式会社 Vehicle drive device
EP3499062B1 (en) * 2017-12-14 2021-04-21 Skf Magnetic Mechatronics A magnetic bearing assembly
JP6838616B2 (en) * 2019-03-28 2021-03-03 ダイキン工業株式会社 Thrust magnetic bearing and turbo compressor with it
CN112013017B (en) * 2020-09-23 2024-05-14 核工业理化工程研究院 Magnetic bearing system with active adjustment and control of axial clearance
CN113623319B (en) * 2021-07-08 2023-06-30 安徽华驰动能科技有限公司 Magnetic suspension bearing with safety braking protection function
CN114810828B (en) * 2022-06-02 2024-03-19 中国科学院电工研究所 Superconducting magnetic suspension rotor supporting magnetic field shaping device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE872137C (en) * 1940-10-20 1953-03-30 Siemens Ag Longitudinal bearings, especially for vertical shafts
AT184977B (en) * 1953-08-08 1956-03-10 Siemens Ag Magnetic support bearing relief for (especially electrical) machines with vertical shaft
US5268608A (en) * 1991-01-11 1993-12-07 American Flywheel Systems, Inc. Flywheel-based energy storage and apparatus
JP2999607B2 (en) * 1991-09-30 2000-01-17 日本精工株式会社 Superconducting bearing device and its operation method
DE9215696U1 (en) * 1992-11-18 1994-03-17 Anton Piller GmbH & Co KG, 37520 Osterode Power generation plant
EP0794344B1 (en) * 1995-06-02 2002-09-18 Ibiden Co, Ltd. High speed rotor assembly
DE19727550C2 (en) * 1996-08-21 2002-05-08 Canders Wolf R Magnetic bearing of a rotor in a stator
FR2756335B1 (en) * 1996-11-25 1999-02-12 Aerospatiale MAGNETIC BEARING LONGITUDINALLY AND TRANSVERSELY ACTIVE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8466591B2 (en) 2009-09-10 2013-06-18 Statoil Asa Bearing system for high speed rotary machine in a sub sea environment

Also Published As

Publication number Publication date
RU2000113791A (en) 2002-04-20
JP2001008406A (en) 2001-01-12
BR0002533A (en) 2000-12-26
CN1275830A (en) 2000-12-06
EP1058368A2 (en) 2000-12-06
DE19924852A1 (en) 2000-12-07

Similar Documents

Publication Publication Date Title
CA2310191A1 (en) Mounting of rotors of generators in a magnetic field
US5481145A (en) Power recovery plant
JP3686093B2 (en) Magnetic bearing device
US7557480B2 (en) Communicating magnetic flux across a gap with a rotating body
CA1058671A (en) Mounting for a long shaft for a machine such as a turbo-engine
US6020665A (en) Permanent magnet synchronous machine with integrated magnetic bearings
EP0580201B1 (en) Magnetic bearing back-up
US6608418B2 (en) Permanent magnet turbo-generator having magnetic bearings
JP4091426B2 (en) Rotary machine with magnetic axial abutment including current source
JP2006513687A (en) Energy storage flywheel with minimum power magnetic bearing and motor / generator
US20030180162A1 (en) Vacuum pump
US20050264118A1 (en) Conical bearingless motor/generator
CN101207309A (en) High speed magnetic suspension permanent magnet motor without bearing
EP2751908A2 (en) Passive magnetic bearings in an induction machine
CN110848253A (en) Three-degree-of-freedom radial-axial integrated hybrid magnetic bearing
US5588754A (en) Backup bearings for extreme speed touch down applications
JP3577558B2 (en) Flywheel equipment
GB2298901A (en) Gas turbine engine axial thrust balancing
CN109826867A (en) A kind of hybrid magnetic suspension bearing system and generator
US9755477B2 (en) Magnetic mounting with force compensation
US20060214525A1 (en) Magnetic suspension and drive system for rotating equipment
JP4028597B2 (en) Magnetic bearing for turbine
CN215009934U (en) Five-degree-of-freedom single-winding bearingless magnetic suspension motor
WO2000037308A1 (en) Turnable propeller device for a ship, an offshore structure or equivalent
EP0763169A1 (en) Dc-biased axial magnetic bearing

Legal Events

Date Code Title Description
FZDE Dead