EP1817505A1 - Bearing with permanent magnetic elements - Google Patents

Bearing with permanent magnetic elements

Info

Publication number
EP1817505A1
EP1817505A1 EP05779375A EP05779375A EP1817505A1 EP 1817505 A1 EP1817505 A1 EP 1817505A1 EP 05779375 A EP05779375 A EP 05779375A EP 05779375 A EP05779375 A EP 05779375A EP 1817505 A1 EP1817505 A1 EP 1817505A1
Authority
EP
European Patent Office
Prior art keywords
bearing
series
rotating
magnetic elements
magnet holder
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
EP05779375A
Other languages
German (de)
French (fr)
Other versions
EP1817505A4 (en
Inventor
Normann SANDÖY
Reidar Vaardal
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.)
Inpower AS
Original Assignee
Norpropeller AS
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 Norpropeller AS filed Critical Norpropeller AS
Publication of EP1817505A1 publication Critical patent/EP1817505A1/en
Publication of EP1817505A4 publication Critical patent/EP1817505A4/en
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
    • F03B11/06—Bearing arrangements
    • 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
    • F16C32/0408—Passive magnetic bearings
    • F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
    • F16C32/0427—Passive magnetic bearings with permanent magnets on both parts repelling each other for axial load mainly
    • 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
    • F16C32/0408—Passive magnetic bearings
    • F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
    • F16C32/0429—Passive magnetic bearings with permanent magnets on both parts repelling each other for both radial and axial load, e.g. conical magnets
    • 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
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/10—Application independent of particular apparatuses related to size
    • F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/30—Ships, e.g. propelling shafts and bearings therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Definitions

  • the invention relates to a bearing as stated in the introductory part of claim 1 with permanent magnetic elements, particularly to take axial forces, e.g. in a hubless propeller for ships, a turbine of an electric generator or a pump.
  • bearings with permanent magnetic elements or passive magnetic bearings for various purposes for which such bearings have not previously been suitable.
  • An example is thrusters for ships.
  • Water lubricated slide bearings have been proposed for such propellers, which can endure the axial forces during operation.
  • PM passive magnetic bearing with permanent magnets
  • the publication WOO 1/84693 describes a passive magnetic axial/radial bearing with statically and rotating PM arranged with alternating polarities. In this case, a ferromagnetic element is rotating with the rotor.
  • the main object of the invention is to create a bearing which primarily is handling axial forces.
  • the bearing should provide an optimum of repulsive power and rigidity, which counteract each other.
  • the bearing should be adaptable to different tolerance requirements.
  • the bearing is a passive magnetic bearing which e.g. can be used for a rotating part of machinery with no axle.
  • the bearing has a stationary and a rotating part.
  • the magnets are arranged as rings, and are arranged mutually repulsive. Normally pulling magnets are used because the attraction between unequal poles is larger than the repulsive force between poles at the same distance.
  • Magnets with axial magnetizing in the same direction are arranged in concentrically grooves in a ferromagnetic material, for alternating N/S polarity, which provides a compressing of the flux and thus larger repulsive magnetic force. This will provide a larger rigidity of the bearing.
  • the magnets to be placed in the ferromagnetic material are calculated in regard of width of the groove, space and depth, relative to the specification of the magnets, to provide optimum repulsion and rigidity.
  • the design and the arrangement of the magnets of the bearing are essential to the force to be accommodated by the bearing, as well as the weight and length of the bearing.
  • One of the advantage of the bearing is that the gap can be made optimal, by the use of FEM analysis relatively to the medium concerned and the load, to reduce viscous losses.
  • a further advantage of permanent magnets relatively to other bearing materials in the proposed area of use is the low costs of permanent magnets relatively to composite materials used for water lubricated bearings.
  • Figure 2 shows a plane view of an annular magnet loop of the bearing of figure 1
  • Figure 3-5 show sections through three further alternatives of annular bearings according to the invention
  • Figure 6 shows a perspective view of a partly sectioned electrically powered propeller with circumferential drive, with a bearing according to the invention
  • Figure 7 shows a force distance diagram of an embodiment of a bearing according to the invention, this bearing been shown in section above the diagram.
  • FIGs 1 and 2 shows a bearing 11 with two bearing rings 12, 13, where the lower bearing ring 12 is fixed with a vertical axis 14.
  • the upper bearing ring 13 will thus carry the load.
  • Each bearing ring 12, 13 comprises a ring 15 of soft iron with an annular groove 16 with rectangular section, which is providing a base or yoke 17.
  • annular groove 16 a series of magnet segments 18, in the example sixteen, are embedded, e.g. by gluing.
  • the magnet segments 18 may be suitable permanent magnets, e.g. of sintered neodymium-iron-boron alloy or samarium-cobalt alloy.
  • a basic parameter for dimensioning the width of the axial flanges 19 and 20 of soft iron, provided by the annular groove 16, is considered to be a closely below saturation state.
  • Figure 3 shows a section through an alternative embodiment, in which two bearing rings 22, 23 each has two grooves 24, 25 for reception of segments 26 of permanent magnets like at the grooves 16 of the embodiment in Figures 1 and 2.
  • three flanges or webs 27, 28, 29 of magnetic conducting soft iron are provided.
  • the load carrying capacity will increase with reduction of the width of the magnetic conductive material, down to a limit whereat the material is saturated.
  • Figure 4 shows a further embodiment with two bearing rings 30, 31, each with three parallel annular grooves 32, 33, 34.
  • the upper bearing ring 31 has an external flange 38 extending down external to the lower bearing ring 30, to provide an air gap 39 which is the gap of the bearing at nominal load. This bearing will have a certain radial rigidity.
  • Figure 5 shows two parallel series of permanent magnets, with a lower bearing ring 40 and an upper bearing ring 41.
  • the lower bearing ring 40 has a frustro conical bearing face with two annular grooves 42, 43, with magnet segments as described for Figure 3.
  • the upper bearing ring 41 provides a mating face facing downward and inward and having two annular grooves 45, 46 with magnet segments 47. This embodiment creates a bearing with radial stability and rigidity.
  • Figure 6 shows an embodiment of a bearing according to the invention for journaling an electrically powered propeller 48.
  • the propeller 48 is surrounded by a cylindrically tubular housing 49 with an upward protruding, centrally located connecting piece 50, which gives access for electrical cables and for mounting to a ship with a mounting flange 51.
  • annular groove 52 is provided adjacent to the propeller 48.
  • a bearing ring 53 according to the invention is arranged, e.g. as shown in Figure 3.
  • the bearing ring 53 has a collar 54 of soft iron, with two magnet rings 55, 56 provided of magnet segments in annular grooves.
  • Symmetrically to the bearing ring 53 is an identical outer bearing ring 57.
  • the bearing ring 53 is secured to the propeller 48 with screws at the bottom of the annular groove 52.
  • a corresponding bearing ring is arranged at the other end of the tubular housing 49.
  • Each of said two bearing rings is kept mounted by a locking ring 58 which is forcing the outer bearing ring 57 against a recess 59 in the annular groove 52.
  • the locking rings 58 are mounted with series of securing bolts around the circumference.
  • the bearing rings may be covered by a coating preventing corrosion when the bearing is used submerged in water.
  • the invention was designed for a 10OkW thruster propeller installed on a ship.
  • the requirement for the bearing was the ability to take a propulsive force of 15000 kp, with a distance of 2 millimetre between the bearing faces.
  • the dimensions of the bearing were:
  • Permanent magnets of a neodymium alloy were used.
  • annular magnets can be assembled of fewer or more segments then shown in the examples.
  • the webs or teeth between and on the side of the magnet segments of the examples are shown with an end flush with the magnet rings.
  • These webs and end flanges can be protruding slightly from the permanent magnets, to take up shocks and to compensate for inaccuracy in the assembly.
  • These can then preferably be provided as a covering of a composite material.
  • a double acting, biased thrust bearing with a first pair of cooperating bearing elements 61, 62 and a second pair of cooperating bearing elements 63, 64 connected to the same machinery is shown. The bearing elements 62, 63 will thus be rotating together.

Abstract

A bearing (11) with permanent magnetic elements (18) which are arranged in a rotating and a not-rotating annular series (12, 13). The rotating series (13) are connected to or integrated with a rotating element. A gap (a) is maintained between said two series of magnetic elements due to the repulsive force acting between them. Such a bearing is particularly suitable at hubless propellers for ships, electric generator turbines and pumps. Improvement is achieved by providing at the mutually rotating annular series (12, 13), that the permanent magnetic elements (18) each is accommodated in a magnet holder (15) of ferromagnetic conductive material, said elements (18) being arranged in recesses (16, 21, 22) in the magnet holder (15) of ferromagnetic conductive material.

Description

Bearing with permanent magnetic elements
The invention relates to a bearing as stated in the introductory part of claim 1 with permanent magnetic elements, particularly to take axial forces, e.g. in a hubless propeller for ships, a turbine of an electric generator or a pump.
Background
It is desirable to use bearings with permanent magnetic elements or passive magnetic bearings (PM bearings) for various purposes for which such bearings have not previously been suitable. An example is thrusters for ships. Water lubricated slide bearings have been proposed for such propellers, which can endure the axial forces during operation. It is desirable to design a bearing with permanent magnets, which can be used alone or combined with a water lubricated slide bearing for this and similar purposes, in which the bearing is submersed in a liquid.
A passive magnetic bearing with permanent magnets (PM) is known, primarily in connection with active magnets, mostly used in small applications with electrical machines and high rotational speed and normally in radial direction. Magnetic bearings are also used in connection with flywheels and rotating energy storing devices. This presents other problems than in the present application, wherein the rotational speed is relatively low and the area available for the magnets are relatively large.
The publication WO99/37912 describes a corresponding bearing with advantages and disadvantages. This document relates to a device with pulling and actively controlled electro magnets.
The publication WOO 1/84693 describes a passive magnetic axial/radial bearing with statically and rotating PM arranged with alternating polarities. In this case, a ferromagnetic element is rotating with the rotor.
US patent specification 5,894,181 describes a passive magnetic axial/radial bearing with axially rotating PM, wherein the bearing is a compromise between axial and radial rigidity balancing each other. Objects
The main object of the invention is to create a bearing which primarily is handling axial forces. The bearing should provide an optimum of repulsive power and rigidity, which counteract each other. The bearing should be adaptable to different tolerance requirements.
The Invention
The invention is stated in claim 1. A larger number of grooves and magnet sections will provide a more rigid bearing than one groove and one magnet ring.
The bearing is a passive magnetic bearing which e.g. can be used for a rotating part of machinery with no axle. The bearing has a stationary and a rotating part. The magnets are arranged as rings, and are arranged mutually repulsive. Normally pulling magnets are used because the attraction between unequal poles is larger than the repulsive force between poles at the same distance. Magnets with axial magnetizing in the same direction are arranged in concentrically grooves in a ferromagnetic material, for alternating N/S polarity, which provides a compressing of the flux and thus larger repulsive magnetic force. This will provide a larger rigidity of the bearing. The magnets to be placed in the ferromagnetic material are calculated in regard of width of the groove, space and depth, relative to the specification of the magnets, to provide optimum repulsion and rigidity. The design and the arrangement of the magnets of the bearing are essential to the force to be accommodated by the bearing, as well as the weight and length of the bearing. One of the advantage of the bearing is that the gap can be made optimal, by the use of FEM analysis relatively to the medium concerned and the load, to reduce viscous losses. A further advantage of permanent magnets relatively to other bearing materials in the proposed area of use, is the low costs of permanent magnets relatively to composite materials used for water lubricated bearings.
The difference to prior art from WO99/37912, WO01/84693 and US 5,894,181 is among other the passive system of the present invention, based on permanent magnets with repulsive polarity, which are embedded in grooves in a ferromagnetic material generating repulsive forces over the gap and thus compressing the flux density. The invention provides a higher rigidity of the bearing. Further details of the invention are stated in the description of an example.
Example
The invention is described below with reference to the drawings, in which Figure 1 shows a schematically section through a first embodiment of an annular bearing according to the invention,
Figure 2 shows a plane view of an annular magnet loop of the bearing of figure 1, Figure 3-5 show sections through three further alternatives of annular bearings according to the invention, Figure 6 shows a perspective view of a partly sectioned electrically powered propeller with circumferential drive, with a bearing according to the invention, while
Figure 7 shows a force distance diagram of an embodiment of a bearing according to the invention, this bearing been shown in section above the diagram.
The bearings of the Figures 1 and 3 - 5 are shown with open gap a, which will be remarkably reduced when loaded.
Figures 1 and 2 shows a bearing 11 with two bearing rings 12, 13, where the lower bearing ring 12 is fixed with a vertical axis 14. The upper bearing ring 13 will thus carry the load. Each bearing ring 12, 13 comprises a ring 15 of soft iron with an annular groove 16 with rectangular section, which is providing a base or yoke 17. In this annular groove 16 a series of magnet segments 18, in the example sixteen, are embedded, e.g. by gluing. The magnet segments 18 may be suitable permanent magnets, e.g. of sintered neodymium-iron-boron alloy or samarium-cobalt alloy.
A basic parameter for dimensioning the width of the axial flanges 19 and 20 of soft iron, provided by the annular groove 16, is considered to be a closely below saturation state.
Figure 3 shows a section through an alternative embodiment, in which two bearing rings 22, 23 each has two grooves 24, 25 for reception of segments 26 of permanent magnets like at the grooves 16 of the embodiment in Figures 1 and 2. Thus three flanges or webs 27, 28, 29 of magnetic conducting soft iron are provided. The load carrying capacity will increase with reduction of the width of the magnetic conductive material, down to a limit whereat the material is saturated.
Figure 4 shows a further embodiment with two bearing rings 30, 31, each with three parallel annular grooves 32, 33, 34. In addition to an inner web 35, and two intermediate webs 36, 37 all ending in then plane of the magnet segments, the upper bearing ring 31 has an external flange 38 extending down external to the lower bearing ring 30, to provide an air gap 39 which is the gap of the bearing at nominal load. This bearing will have a certain radial rigidity.
Figure 5 shows two parallel series of permanent magnets, with a lower bearing ring 40 and an upper bearing ring 41. The lower bearing ring 40 has a frustro conical bearing face with two annular grooves 42, 43, with magnet segments as described for Figure 3. The upper bearing ring 41 provides a mating face facing downward and inward and having two annular grooves 45, 46 with magnet segments 47. This embodiment creates a bearing with radial stability and rigidity.
Figure 6 shows an embodiment of a bearing according to the invention for journaling an electrically powered propeller 48. The propeller 48 is surrounded by a cylindrically tubular housing 49 with an upward protruding, centrally located connecting piece 50, which gives access for electrical cables and for mounting to a ship with a mounting flange 51.
At each end of the housing 49, an annular groove 52 is provided adjacent to the propeller 48. At the bottom of the annular groove 52, a bearing ring 53 according to the invention is arranged, e.g. as shown in Figure 3. The bearing ring 53 has a collar 54 of soft iron, with two magnet rings 55, 56 provided of magnet segments in annular grooves. Symmetrically to the bearing ring 53 is an identical outer bearing ring 57. The bearing ring 53 is secured to the propeller 48 with screws at the bottom of the annular groove 52.
A corresponding bearing ring is arranged at the other end of the tubular housing 49. Each of said two bearing rings is kept mounted by a locking ring 58 which is forcing the outer bearing ring 57 against a recess 59 in the annular groove 52. The locking rings 58 are mounted with series of securing bolts around the circumference. The bearing rings may be covered by a coating preventing corrosion when the bearing is used submerged in water.
In an example, the invention was designed for a 10OkW thruster propeller installed on a ship. The requirement for the bearing was the ability to take a propulsive force of 15000 kp, with a distance of 2 millimetre between the bearing faces. The dimensions of the bearing were:
Inner diameter 0, 60 meters
Outer diameter; 0,70 metres
Maximum height 0,70 metres
Average height 0,05 metre
Average circumference 2,04 metre
Permanent magnets of a neodymium alloy were used.
Modifications
Multiple rows of more magnets glued end to end in the annular groove than shown may be used. The annular magnets can be assembled of fewer or more segments then shown in the examples.
The webs or teeth between and on the side of the magnet segments of the examples are shown with an end flush with the magnet rings. These webs and end flanges can be protruding slightly from the permanent magnets, to take up shocks and to compensate for inaccuracy in the assembly. These can then preferably be provided as a covering of a composite material.
In Figure 7 a force distance diagram is shown for an embodiment of a bearing according to the invention shown in section above the diagram. The distance is stated in millimetre and the force in kilopond (1 kp = 9,8 Newton). A double acting, biased thrust bearing with a first pair of cooperating bearing elements 61, 62 and a second pair of cooperating bearing elements 63, 64 connected to the same machinery is shown. The bearing elements 62, 63 will thus be rotating together. With an axial displacement of the rotating bearing elements 62, 63 to the left of the Figure of 1,3 millimetre, the bearing force of the left part of the bearing will increase to 2250 kp, while the counter force for the right part of the bearing will b reduced to 1100 kp with a distance of 3,3 millimetre, The bearing will then be in equilibrium with an axial balance F of l l50 kp.

Claims

Claims
1. Device for a bearing (11) with permanent magnetic elements (18) which are arranged in a rotating and a not-rotating annular series (12, 13), said rotating series (13) being connected to or integrated with a rotating element, wherein a gap (a) is maintained between said two series of magnetic elements due to the repulsive force acting between them, particularly for use at hubless propellers for ships, electric generator turbines and pumps, characterized in that at the mutually rotating annular series (12, 13), the permanent magnetic elements (18) each is accommodated in a magnet holder (15) of ferromagnetic conductive material, said elements (18) being arranged in recesses (16, 21, 22) in the magnet holder (15) of ferromagnetic conductive material.
2. Device according to claim 1, characterized in that the recesses (16) are extending radically across the width of the magnet holder (15).
3. Device according to claim 1, characterized in that the ferromagnetic material is soft iron.
4. Device according to one of the claims 1 to 3, characterized in that it comprises two or more series of recesses (24, 25; 32.34) next to another.
5. Device according to one of the claims 1 to 4, characterized in that the two series of permanent magnets are assembled of arced segments (18) arranged with end contact.
6. Device according to one of the claims 1 to 5, characterized in that the permanent magnetic elements (18) are glued together to an annular series (12, 13).
7. Device according to one of the claims 1 to 4, characterized in that the gap between the mutually rotating series of permanent magnetic elements is conical.
8. Device according to one of the claims 1 to 7, characterized in that similar magnetic gearings are arranged on both ends of a rotating element, to bring the rotating element in a labile centred position.
9. Device according to one of the claims 1 to 8, characterized in that one magnet holder (31) of ferromagnetic material comprises a collar (38) axially protruding the other magnet holder (30), to provide an air gap (39) against the other magnet holder.
EP05779375A 2004-08-25 2005-08-24 Bearing with permanent magnetic elements Ceased EP1817505A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20043556A NO322779B1 (en) 2004-08-25 2004-08-25 Stock with permanent magnetic elements
PCT/NO2005/000306 WO2006022554A1 (en) 2004-08-25 2005-08-24 Bearing with permanent magnetic elements

Publications (2)

Publication Number Publication Date
EP1817505A1 true EP1817505A1 (en) 2007-08-15
EP1817505A4 EP1817505A4 (en) 2012-03-07

Family

ID=35044506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05779375A Ceased EP1817505A4 (en) 2004-08-25 2005-08-24 Bearing with permanent magnetic elements

Country Status (3)

Country Link
EP (1) EP1817505A4 (en)
NO (1) NO322779B1 (en)
WO (1) WO2006022554A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007032443A1 (en) 2007-07-10 2009-01-15 Voith Patent Gmbh Hybrid bearing and method for its production
IT1390881B1 (en) * 2008-07-17 2011-10-19 Zeta Camini S R L FUME EXTRACTOR FIXTURE FOR CHIMNEY, CHIMNEYS, SMOKE AND SIMILAR CANES
DE102008038067A1 (en) * 2008-08-16 2010-02-18 Schaeffler Kg Storage arrangement for a machine table with magnetic discharge
NO331651B1 (en) 2009-05-20 2012-02-13 Rolls Royce Marine As Storage of propeller unit for a vessel
GB2479367A (en) * 2010-04-06 2011-10-12 Donald Robertson Hubless turbine tube
NZ603903A (en) 2010-04-30 2014-11-28 Clean Current Ltd Partnership Unidirectional hydro turbine with enhanced duct, blades and generator
CH707582B1 (en) * 2013-02-04 2018-12-14 Montres Breguet Sa Watch sub-assembly with magnetic or electrostatic pivoting.
CN103629232A (en) * 2013-11-18 2014-03-12 钱坤喜 Permanent-magnetic de-loading radial roller bearing
CN103629233A (en) * 2013-11-18 2014-03-12 钱坤喜 Permanent-magnetic de-loading axial roller bearing
EP2886890B1 (en) * 2013-12-18 2019-06-26 Skf Magnetic Mechatronics Thrust disc, magnetic bearing and apparatus
DE102021111401A1 (en) * 2021-05-03 2022-11-03 Rosen Swiss Ag Propulsion device for propelling a watercraft

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2136371A1 (en) * 1971-07-21 1973-02-01 Braun Karl MAGNETIC STORAGE OF SHAFTS OR THE LIKE
JPS50145750A (en) * 1974-05-17 1975-11-22
US4379598A (en) * 1980-12-22 1983-04-12 North American Philips Corporation Magnetic bearing
JPS5883552A (en) * 1981-11-12 1983-05-19 Hitachi Koki Co Ltd Rotary machine
DE3638129A1 (en) * 1986-11-08 1988-05-11 Licentia Gmbh Large diameter turbogenerator for generating electrical energy at high power
DE10062065A1 (en) * 2000-12-13 2002-03-28 Siemens Ag Magnetic bearing device e.g. for electrical machine shaft, uses opposing magnets for supporting rotating part relative to stationary part in both axial and radial directions
US20030052558A1 (en) * 2001-09-17 2003-03-20 Brackett Norman C. Repulsive lift systems, flywheel energy storage systems utilizing such systems and methods related thereto

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180296A (en) * 1978-01-06 1979-12-25 Societe Europeenne De Propulsion Axial electromagnetic bearing for a shaft rotating at high speed
JPS5937332A (en) * 1982-08-25 1984-02-29 Mitsubishi Electric Corp Thrust bearing device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2136371A1 (en) * 1971-07-21 1973-02-01 Braun Karl MAGNETIC STORAGE OF SHAFTS OR THE LIKE
JPS50145750A (en) * 1974-05-17 1975-11-22
US4379598A (en) * 1980-12-22 1983-04-12 North American Philips Corporation Magnetic bearing
JPS5883552A (en) * 1981-11-12 1983-05-19 Hitachi Koki Co Ltd Rotary machine
DE3638129A1 (en) * 1986-11-08 1988-05-11 Licentia Gmbh Large diameter turbogenerator for generating electrical energy at high power
DE10062065A1 (en) * 2000-12-13 2002-03-28 Siemens Ag Magnetic bearing device e.g. for electrical machine shaft, uses opposing magnets for supporting rotating part relative to stationary part in both axial and radial directions
US20030052558A1 (en) * 2001-09-17 2003-03-20 Brackett Norman C. Repulsive lift systems, flywheel energy storage systems utilizing such systems and methods related thereto

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2006022554A1 *

Also Published As

Publication number Publication date
NO322779B1 (en) 2006-12-11
WO2006022554A1 (en) 2006-03-02
EP1817505A4 (en) 2012-03-07
NO20043556D0 (en) 2004-08-25
NO20043556L (en) 2006-02-27

Similar Documents

Publication Publication Date Title
EP1817505A1 (en) Bearing with permanent magnetic elements
JP5992403B2 (en) Flywheel energy system
US9985512B2 (en) Large magnetically geared machines
US9219395B2 (en) Large magnetically geared machines
EP2479876B1 (en) Direct-drive electric equipment
CN101405931B (en) Generator and magnetic flux conducting unit
US8026626B1 (en) Axial flux alternator with air gap maintaining arrangement
US6236127B1 (en) Flywheel energy accummulator
US10367405B2 (en) Vertically mounted and magnetically driven power generation apparatus with weight-free and energy-saving effect
US20070247013A1 (en) Aerodynamic insert for high speed permanent magnet motor
CN102148592A (en) Magnetic suspension support structure used for vertical hub-disk motor
WO2012071111A1 (en) Axial flux alternator with air gap maintaining arrangement
CN111852883B (en) High-efficiency magnetic coupling suspension pump
CN107070073B (en) Magnetic suspension flywheel battery
EP3017529B1 (en) Reducing bearing forces in an electrical machine
US4628221A (en) Homopolar motor with pressurized liquid metal contact
CA3045404A1 (en) Improvements to rotary generators
CN203481988U (en) Magnetic suspension flywheel motor
EP3260701A1 (en) Oscillating pendulum-based power generation mechanism of a power generator
WO2016185496A1 (en) Energy storage device with a flywheel supported on rolling bearings and with permanent magnets to relieve the load on the rolling bearings
EP3469223B1 (en) Rotating mass energy store
KR102540805B1 (en) rotor for generator
CN112054648B (en) Bearing-free switch reluctance linear motor
WO2023187454A1 (en) Magnetic bearing for a hydraulic turbine
CN117480713A (en) Axial alignment system for a rotor of a rotating electrical machine and corresponding rotating electrical machine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20070615

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20120202

RIC1 Information provided on ipc code assigned before grant

Ipc: F03B 11/06 20060101ALN20120127BHEP

Ipc: F16C 32/04 20060101AFI20120127BHEP

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: INPOWER AS

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: INPOWER AS

17Q First examination report despatched

Effective date: 20130206

REG Reference to a national code

Ref country code: DE

Ref legal event code: R003

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20181011