GB2426554A - Tubular turbine with magnetic bearings - Google Patents

Tubular turbine with magnetic bearings Download PDF

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Publication number
GB2426554A
GB2426554A GB0510774A GB0510774A GB2426554A GB 2426554 A GB2426554 A GB 2426554A GB 0510774 A GB0510774 A GB 0510774A GB 0510774 A GB0510774 A GB 0510774A GB 2426554 A GB2426554 A GB 2426554A
Authority
GB
United Kingdom
Prior art keywords
turbine unit
energy conversion
unit according
rotor
flow
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.)
Withdrawn
Application number
GB0510774A
Other versions
GB0510774D0 (en
Inventor
Viktor A Jovanovic
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0510774A priority Critical patent/GB2426554A/en
Publication of GB0510774D0 publication Critical patent/GB0510774D0/en
Priority to PCT/GB2006/001932 priority patent/WO2006126001A1/en
Priority to EP06744003A priority patent/EP1896722A1/en
Publication of GB2426554A publication Critical patent/GB2426554A/en
Withdrawn legal-status Critical Current

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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
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/70—Bearing or lubricating 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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
    • F01D1/32—Non-positive-displacement machines or engines, e.g. steam turbines with pressure velocity transformation exclusively in rotor, e.g. the rotor rotating under the influence of jets issuing from the rotor, e.g. Heron turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/03—Annular blade-carrying members having blades on the inner periphery of the annulus and extending inwardly radially, i.e. inverted rotors
    • 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
    • F03B17/00—Other machines or engines
    • F03B17/06—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head"
    • F03B17/061—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially in flow direction
    • 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
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/08—Machines or engines of reaction type; Parts or details peculiar thereto with pressure-velocity transformation exclusively in rotors
    • 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
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/0608—Rotors characterised by their aerodynamic shape
    • 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
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • F03D11/0008—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807—Rotary generators
    • H02K7/1823—Rotary generators structurally associated with turbines or similar engines
    • H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2220/00—Application
    • F05B2220/70—Application in combination with
    • F05B2220/706—Application in combination with an electrical generator
    • F05B2220/7068—Application in combination with an electrical generator equipped with permanent magnets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/13—Stators to collect or cause flow towards or away from turbines
    • F05B2240/133—Stators to collect or cause flow towards or away from turbines with a convergent-divergent guiding structure, e.g. a Venturi conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/33—Shrouds which are part of or which are rotating with the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/50—Bearings
    • F05B2240/51—Bearings magnetic
    • F05B2240/515—Bearings magnetic electromagnetic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/50—Intrinsic material properties or characteristics
    • F05B2280/5008—Magnetic properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/70—Application in combination with
    • F05D2220/76—Application in combination with an electrical generator
    • F05D2220/768—Application in combination with an electrical generator equipped with permanent magnets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/50—Bearings
    • F05D2240/51—Magnetic
    • F05D2240/515—Electromagnetic
    • 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
    • F16C2360/00—Engines or pumps
    • F16C2360/31—Wind motors
    • 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
    • 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
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

A turbine comprises a tubular duct rotor RT, with fluid engaging elements R arranged there within, and a tubular duct stator SR, the rotor RT being positioned within, and rotatable relative to, the stator SR via a magnetic bearing arrangement MB1, MB2. The fluid engaging elements R may be attached to the rotor RT at their tips. The rotor RT may comprise additional magnets (MS, figs 3 and 4, page 4/4) which rotate within a superconducting wire unit (SU, fig 4, page 4/4) to product an electric current. The turbine may be a wind turbine.

Description

1
2426554
Energy Conversion Turbine Unit
This invention relates to an energy-generating turbine.
Dynamic flow of liquids, gasses or a combination of both is converted into energy by transforming the force of free-flowing streams into a rotation force by the revolving motion of the propeller attached to the turbine rotor. The efficiency of the turbine is measured by its ability to produce energy and this is dependant on the design of the turbine propeller and the rotor unit as a whole.
Problems typically encountered by existing wind energy extracting turbines for example is that energy conversion from free-flowing fluid streams is limited because energy extraction implies decrease of fluid velocity. This decrease of kinetic energy of the free-flowing fluid stream cannot fall down to zero, it should continue travelling but as the turbine is an obstruction to the fluid flow some fluid may not pass through the turbine and may simply flow around it.
To maximise design efficiency the present invention proposes to integrate both propeller and hub within the turbine rotor shaft in order to streamline the design and maximise efficiency by reducing negative effects of drag and friction.
The new design of the nacelle and turbine unit as a whole and the propeller rotor in particular creates a slippery profile which reduces the negative effects of drag and improves the velocity of flow, maintaining the kinetic energy of the stream through the turbine unit while generating the maximum rotational speed.
The blades of modern large wind turbines become very long and their rotational speed decreases making it difficult to achieve a required tip speed ratio. This implies that the part of the blade close to the root or the rotor hub will operate at a very low speed ratio, thus producing rotational wake-related losses. As a general rule, the upper 1/3 of the blade close to its tip generates 2/3 of the power for the whole blade. The lower 1/3 of the blade closest to the hub is almost unproductive in nominal conditions.
Preferably the propeller blades are shorter as this increases their rotational speed and helps to maintain a tip speed ratio, which allows the upper part of the blade to be attached to the rotor and produce rotational wake-related gains. Preferably the rotor unit will rotate resting on magnetic suspension bearings thus further reducing negative effects of friction.
The invention will now be described solely by way of example and with reference to the accompanying drawings in which:
Page: 1/4, Fig1 shows nacelle N, horizontal shaft unit H, the dynamic inflow W causing propeller R to rotate.
2
Page: 1/4, Fig2 shows the plan view of nacelle N, horizontal shaft unit H, the dynamic inflow Wi generating the rotation of propeller R and depicting the dynamic outflow Wo.
Page: 1/4, Fig3 shows the front view Hf of nacelle N, horizontal shaft unit H, and propeller R.
Page: 1/4, Fig4 shows the rear view Hb of nacelle N, horizontal shaft unit H, and propeller R.
Page: 2/4, Fig1 shows the horizontal shaft unit H, the dynamic inflow W generating the rotation of propeller R and rotor assembly RA.
Page: 2/4, Fig2 shows propeller R from angle of view R1.
Page: 2/4, Fig3 shows propeller R from angle of view R2.
Page: 3/4, Fig1 shows the horizontal shaft unit H, the dynamic inflow W generating the rotation of propeller R and rotor assembly RA, arrows indicate the position of Magnetic suspension bearings MB1 and MB2.
Page: 3/4, Fig2 shows the cutaway view of magnetic bearing MB, with the magnet M1 exerting magnetic force north N directed outwards toward magnet M2 that is also exerting magnetic force north N inwards toward magnet M1 thus creating an air cushion between magnets M1 and M2.
Page: 3/4, Fig3 shows the magnetic suspension bearing MB with arrows indicating the positions of magnets M1 and M2 relative to cutaway view Fig2, and arrows indicating the position of stator SR and rotor RT of the magnetic suspension bearing MB within the horizontal shaft unit H on Fig1.
Page: 4/4, Fig1 shows the internal view of horizontal shaft unit H, illustrating the positions of stator assembly SA, rotor assembly RA and superconducting wire unit SU.
Page: 4/4, Fig2 shows the superconducting wire unit SU and arrows indicating the positions of laminated core LC on the unit SU and on stator assembly SA of horizontal shaft unit H on Fig1. Fig2 also shows the armature windings AW with arrows indicating the position of AW on the superconducting wire unit SU and on stator assembly SA of horizontal shaft unit H on Fig1.
Page: 4/4, Fig3 again shows the internal view of horizontal shaft unit H, illustrating the positions of rotor assembly RA and stator assembly SA. Magnet assembly MS has arrows indicating the positions of the magnetic poles north N and south S attached to the'rotor assembly RA.
Page: 4/4, Fig4 shows the rotor assembly RA and stator assembly SA inside the coil of superconducting wire unit SU.
3
On the first page 1/4, Fig1 illustrates nacelle N containing a horizontal shaft unit H guides the dynamic inflow W representing wind flow, gas flow, liquid flow or a mixture of both, which travels along the length of the shaft interior causing propeller R to rotate.
The dynamic inflow Wi, Fig2 on page 1/4 enters the opening at the front of horizontal shaft unit H see Fig3 on page 1/4, exerts a force onto propeller R causing it to rotate see page 2/4, Fig2 and Fig3 and drives outflow Wo to exit the rear of unit H, see Fig4 page 1/4.
The outer tips of propeller R are attached to the inside edge of rotor assembly RA, Fig1 on page 2/4. The rotor assembly RA sits inside the rotor RT of magnetic suspension bearings MB1 and MB2 see Fig1 page 3/4. Rotor RT rotates inside stator SR, Fig3 page 3/4 suspended on a magnetic field see Fig2 page 3/4.
The outer portion of rotor assembly RA has 4 magnets MS attached with the North Pole N and South Pole S opposite each other Fig3 page 4/4. The outer portion of stator assembly SA, Fig1 page 4/4 is positioned surrounding and enclosing rotor assembly RA, Fig1 and Fig3 page 4/4.
The superconducting wire unit SU, Fig2 page 4/4 is positioned on the outer portion of stator assembly SA, Fig1 page 4/4. Armature windings AW and laminated core LC make up the superconducting wire unit SU, Fig2 page 4/4 which is positioned on the outer portion of stator assembly SA, Fig1 page 4/4.
The magnets MS attached to the rotor assembly RA rotate inside the coil of superconducting wire unit SU and produce an electric current; see Fig3 and Fig4 page 4/4.

Claims (16)

An energy conversion turbine unit is a turbine generator, which converts free-flowing dynamic stream energy into a rotation force, comprising a redesigned nacelle and propeller element which sits housed in a tubular duct rotor, which is suspended on a magnetic force field, that rotates about an axis inside a tubular duct stator. An energy conversion turbine unit according to claim 1, in which the shape of the propeller presents a smaller profile to the incoming dynamic flow thus reducing the drag force on the propeller blades and enabling the blades to rotate more freely. An energy conversion turbine unit according to claim 1, in which the optimum length of the propeller blades increases their rotational speed potential to maximise the tip speed ratio, as the upper 1/3 of the blade generates 2/3 of the of the power for the whole blade. An energy conversion turbine unit according to claim 1, in which the upper 1/3 of each blade is attached to the rotor hub thus allowing highest rotational speed to be converted into maximum power. An energy conversion turbine unit according to claim 1, in which the tubular duct shape of the turbine unit channels and accelerates the free-flowing dynamic stream, enabling the fluid stream to flow through instead of around the turbine unit. An energy conversion turbine unit according to claim 1, in which the magnetic suspension bearings minimise the negative effects of friction normally caused by the contact on the rotor and stator surfaces of ball bearings. -s- Amendments to the claims have been filed as follows Claims
1. An energy conversion turbine unit for converting free-flowing dynamic stream energy into rotation, comprising a nacelle, an annular stator element and an annular rotor element rotatably mounted in the stator element, stream-engaging blades extending radially inwardly from the annular rotor into a flow duct defined therein.
2. An energy conversion turbine unit according to claim 1, being a wind turbine.
3. An energy conversion turbine unit according to claim 1 or 2, being a horizontal axis turbine.
4. An energy conversion turbine unit according to any preceding claim, wherein the outer profile of the nacelle preferably curves smoothly or does not increase or decrease in dimension normal to the flow direction.
5. An energy conversion turbine unit according to any preceding claim, wherein the nacelle is of length in the flow direction at least equal to its maximum dimension in the direction normal to the direction of flow
6. An energy conversion turbine unit according to any preceding claim, wherein the axial extent of the stator is at least equal to its diameter.
7. An energy conversion turbine unit according to any preceding claim, wherein the axial extent of the rotor is at least equal to its diameter.
8. An energy conversion turbine unit according to any preceding claim, wherein the flow duct defined by the rotor decreases from an upstream end to a minimum dimension and then increases
9. An energy conversion turbine unit according to any preceding claim, wherein the maximum diameter of the flow duct defined by the rotor element comprises between 0.5 and 0.75 of the maximum external dimension in the direction normal to the flow of the nacelle
10. An energy conversion turbine unit according to any preceding claim, wherein the flow duct defined by the rotor comprises a portion in which the flow is engaged by blades and a portion in which the flow is not engaged by blades
11. An energy conversion turbine unit according to any preceding claim, wherein there is a plurality of bearings, spaced apart from one another in the axial direction.
• V
12. An energy conversion turbine unit according to any preceding claim, comprising a turbine generator for converting free flowing dynamic stream energy into rotation force, the generator comprising a nacelle and a propeller element which sits housed in a tubular duct rotor, which is suspended on a magnetic force field, that rotates about an axis inside a tubular duct stator.
13. An energy conversion turbine unit according to any preceding claim, in which the optimum length of the propeller blades increases their rotational speed potential to maximise the tip speed ratio, the upper 1/3 of the blade generating 2/3 of the of the power for the whole blade.
14. An energy conversion turbine unit according to any preceding claim, in which the upper 1/3 of each blade is attached to the rotor hub thus allowing highest rotational speed to be converted into maximum power.
15. An energy conversion turbine unit according to claim 1, in which the tubular duct shape of the turbine unit channels and accelerates the free-flowing dynamic stream, enabling the fluid stream to flow through instead of around the turbine unit.
16. An energy conversion turbine unit according to any preceding claim, in comprising magnetic suspension bearings to minimise negative effects of friction normally caused by the contact on the rotor and stator surfaces of ball bearings.
GB0510774A 2005-05-26 2005-05-26 Tubular turbine with magnetic bearings Withdrawn GB2426554A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB0510774A GB2426554A (en) 2005-05-26 2005-05-26 Tubular turbine with magnetic bearings
PCT/GB2006/001932 WO2006126001A1 (en) 2005-05-26 2006-05-25 Energy conversion turbine unit
EP06744003A EP1896722A1 (en) 2005-05-26 2006-05-25 Energy conversion turbine unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0510774A GB2426554A (en) 2005-05-26 2005-05-26 Tubular turbine with magnetic bearings

Publications (2)

Publication Number Publication Date
GB0510774D0 GB0510774D0 (en) 2005-06-29
GB2426554A true GB2426554A (en) 2006-11-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0510774A Withdrawn GB2426554A (en) 2005-05-26 2005-05-26 Tubular turbine with magnetic bearings

Country Status (3)

Country Link
EP (1) EP1896722A1 (en)
GB (1) GB2426554A (en)
WO (1) WO2006126001A1 (en)

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WO2009141644A2 (en) * 2008-05-19 2009-11-26 Michael David Maimone Natural and mechanical-driven generator system
EP2232054A1 (en) * 2007-12-20 2010-09-29 Rsw Inc. Kinetic energy recovery turbine
CN101943134A (en) * 2009-07-10 2011-01-12 王忠玉 Windproof and rainproof cover of wind machine with giant magnetic levitation perpendicular shaft cable-stayed structure
WO2012054276A1 (en) * 2010-10-22 2012-04-26 Louisiana Tech Research Foundation A rotating housing turbine
DE102013013405A1 (en) * 2013-08-01 2015-02-05 hdf-mjf- Technologies OHG Rotor assembly for obtaining energy by flow energy or flow energy and method for holding rotors
EP2740930A4 (en) * 2011-08-04 2015-05-20 Paulo Botelho Wind energy generator on a wind-harnessing platform
DE102011012147B4 (en) * 2011-02-24 2021-05-06 Gilbert Doko turbine

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Publication number Priority date Publication date Assignee Title
IT1401294B1 (en) * 2010-06-09 2013-07-18 Marracino MODULAR WIND IMPELLER WITH VERTICAL AXIS AND WIND GENERATOR INCLUDING THIS IMPELLER

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EP1896722A1 (en) 2008-03-12
WO2006126001A1 (en) 2006-11-30

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