WO2023064948A1 - Évitement de charge de pointe magnétique dans un système de conversion d'énergie houlomotrice - Google Patents

Évitement de charge de pointe magnétique dans un système de conversion d'énergie houlomotrice Download PDF

Info

Publication number
WO2023064948A1
WO2023064948A1 PCT/US2022/078183 US2022078183W WO2023064948A1 WO 2023064948 A1 WO2023064948 A1 WO 2023064948A1 US 2022078183 W US2022078183 W US 2022078183W WO 2023064948 A1 WO2023064948 A1 WO 2023064948A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic unit
magnetic
motion
wave
magnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2022/078183
Other languages
English (en)
Inventor
Narayan R. IYER
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
Publication of WO2023064948A1 publication Critical patent/WO2023064948A1/fr
Anticipated expiration legal-status Critical
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
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
    • F03B13/1845—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem
    • F03B13/1865—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem where the connection between wom and conversion system takes tension only
    • 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
    • F05B2260/00—Function
    • F05B2260/40—Transmission of power
    • F05B2260/404—Transmission of power through magnetic drive coupling
    • 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
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/107—Purpose of the control system to cope with emergencies
    • F05B2270/1077—Storm protection
    • 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

Definitions

  • WECs wave energy converters
  • Some such proposals have included means of dissipating high forces sustained by the WECs, such a device is described in US Patent 10,352,291 B2 by Oscilla Power, wherein a hydraulic method of peak load dissipation is discussed.
  • this method requires active controls via manipulation of moving parts such as valves and/or pistons.
  • moving parts can corrode or biofoul in sea conditions, and such active controls are complex to design and build.
  • the present invention solves the problem by using a passive magnetic coupling that uncouples when the source force is too high.
  • the present invention also describes the location with respect to other WEC components wherein said magnetic coupling needs to be placed, as well as the use of magnetic patterns such as the Halbach array to increase the magnetic force of the magnetic coupling.
  • Wave energy systems generally comprise of: a body that absorbs wave motion, a connection, such as rope, that links said absorbing body to a more stiff reaction body such as a seafloor or other less wave-responsive underwater or above-water body, a restorative mechanism such as a spring that brings the buoy back to an equilibrium position once the wave subsides, and a power takeoff system that carries out desalination or electricity production.
  • the present invention strategically places a magnetic coupler between these components so as to not adversely affect the motion of the buoy whilst keeping the more delicate PTO safe from damage.
  • Peak load averting magnetic coupling of a wave energy converter needs to be located strategically.
  • Most wave energy converters have a restoration method: a method that restores the WEC to an equilibrium position, such as a spring.
  • a rotatory body such as a reel or sheave
  • the sheave is also physically coupled to a first magnetic unit of a magnetic coupler; the sheave is not however physically coupled to the power-takeoff (gearboxes if any and generator) of the wave energy converter, instead a second magnetic unit of the magnetic coupler is physically coupled to the power takeoff, and the second magnetic unit is non-physically and magnetically coupled to the first magnetic unit.
  • a restorative mechanism such as a spring or a counter-weight
  • the present invention is an apparatus and system for magnetically transferring motion in a selective manner which is designed to satisfy the aforementioned needs, provide the previously stated objects, include the above-listed features, and achieve the already articulated advantages.
  • the present invention is carried out in accordance with the claims, in a sense that magnetic forces are involved in stated transfer of force and motion.
  • the present invention is a method to inhibit transmission of an input load exceeding a threshold, to a power-takeoff system in a wave energy converter, the method comprising the steps of: transferring a relative motion, between an absorber body and a reaction body, to a rotatory body; wherein the reaction body is at least one of solid earth and a body that is less responsive to a water wave motion than the absorber body; providing a magnetic coupler comprising a first magnetic unit and a second magnetic unit, with each magnetic unit comprising at least one magnet, wherein the first magnetic unit and second magnetic unit, combined, comprise a maximum net magnetic strength, wherein a net load exerted on the coupler that is above said maximum strength causes the first magnetic unit to move substantially independently from the second magnetic unit; wherein the first magnetic unit substantially transfers motion, via magnetic force, to the second magnetic unit, only if the net load exerted on the coupler is at or below said strength; transferring the input load from the rotatory body to the first magnetic unit through a physical medium,
  • the present invention is a method to convert water body wave motion to usable energy, the method comprising the steps of: providing an absorber body that is allowed to move relative to a reaction body; wherein said motion of the absorber body is in response to a water wave motion; wherein the reaction body is at least one of solid earth and a body less responsive to said water wave motion than the absorber body; physically transferring the relative motion of the absorber body, with respect to the reaction body, to a rotatory body; wherein the rotatory body is physically coupled with a first magnetic unit; wherein the rotatory body is, at least in part, substantially non-physically coupled with a second magnetic unit by a net magnetic force, while said rotatory body being physically coupled with a restorative mechanism; wherein the restorative mechanism provides restorative force to bring the absorber body toward an equilibrium after a wave force, which displaced the absorber body away from said equilibrium, substantially subsides; wherein the second magnetic unit is physically coupled to a power takeoff system; wherein the
  • the present invention is an apparatus that converts water body wave motion to usable energy, the apparatus comprising: an absorber body that is allowed to move relative to a reaction body (20); wherein said motion of the absorber body is in response to a water body’s wave motion; wherein the reaction body is at least one of solid earth and a body less responsive to said water body wave motion than the absorber body; a means to transfer the relative motion of the absorber body, with respect to the reaction body, to a rotatory body; wherein the rotatory body is physically coupled with a first magnetic unit (6); wherein the rotatory body is, at least in part, substantially non-physically coupled with a second magnetic unit by a net magnetic force and physically coupled with a restorative mechanism; wherein the restorative mechanism provides restorative force to bring the absorber body toward an equilibrium after a wave force, which displaced the absorber body away from said equilibrium, substantially subsides; wherein the second magnetic unit is physically coupled to a power takeoff system; wherein the first magnetic
  • FIG. 1 shows a front-top-left perspective view of one embodiment of the present invention, wherein the wave energy buoy body 2 is made opaque to show internal components of said body.
  • FIG. 2 shows the same embodiment as FIG. 1 from a front view without the buoy body and water shown.
  • FIG. 3 shows an alternative embodiment of FIG. 1 and 2 without the buoy body and water shown.
  • FIG. 4a and 4b show the embodiment of FIG 2. wherein a load is building up as the wave energy converter encounters more of a wave.
  • FIG. 5 shows the same embodiment of FIG. 4a and 4b, wherein the load has built up beyond a threshold value.
  • FIG. 6 shows an alternate embodiment of the current invention, wherein a barrier is provided to waterproof compartments within a wave energy converter.
  • FIG. 7 shows a perspective view of one embodiment of a magnetic unit of a magnetic coupler, with magnets hidden.
  • FIG. 8 shows the same embodiment of FIG. 7 but with magnets visible.
  • FIG. 9 shows one embodiment of FIG. 7, wherein a removable plate prevents the magnets from being pulled out of the pockets.
  • a load is at least one of a force and a torque.
  • the present invention is a method and related apparatus for magnetically providing a non-physical motion link that can uncouple without causing physical wear, or other damage whilst allowing the wave energy converter to retain restorative dynamic properties via an uninterrupted connection to a restorative mechanism.
  • An advantage of the present invention is to minimize maintenance requirements of wave energy converters (WECs) that can occur due to wear and stress, as well as provide storm damage protection.
  • WECs wave energy converters
  • a wave energy converter is shown at least partially submerged in a water body 30, with said wave energy converter having an absorber buoy body 2, connected via a flexible link 1 to the seafloor 20, here the seafloor is the reaction body.
  • a reaction body is one which the absorber body moves relative to in order for wave energy conversion to occur.
  • FIG. 1 depicts the flexible link 1 being wound around a rotatory body 3, such as a sheave. In some embodiments, the sheave 3 is physically connected with a rotational spring 5 via a shaft 4.
  • the first magnetic unit 6 is physically coupled with the sheave 3, and is also physically coupled with a restorative mechanism 5, which in the embodiment of FIG 2 is a rotational spring.
  • the first magnetic unit 6 comprises at least one magnet 10, and is configured in the substantial magnetic influence of the second magnetic unit 7 with a non-physical gap 15. There is no physical coupling between the first magnetic unit and the second magnetic unit in any manner that substantially transfers motion.
  • the second magnetic unit 7 is physically coupled to the power takeoff in which motion is transferable from the second magnetic unit to the power takeoff.
  • the power takeoff comprises at least one of a generator 9 and a gearbox 8.
  • the power takeoff is any of a desalinator and a hydraulic turbine.
  • coupling refers to a connection between two or more components that transfers motion between said components.
  • the restorative mechanism 5 instead of a rotational spring as the restorative mechanism 5, the restorative mechanism 5 comprises a hanging weight 13 coupled to a second sheave 14.
  • the restorative mechanism is at least one of a hydraulic and a pneumatic spring.
  • the first magnetic unit 6 and the second magnetic unit 7 of the magnetic coupler 16 comprise a maximum net magnetic attractive strength, which is the maximum torque within which the first magnetic unit and second magnetic unit are coupled to each other via magnetic attractive forces. Once said net magnetic attractive strength is exceeded by some external load (source external to coupler), the first and second magnetic units decouple and move relative to each other. In some embodiments, strength is defined by the level at which the component has the ability to accommodate a load without decoupling.
  • a resistive torque In order to turn a generator to produce electricity, a resistive torque has to be overcome. In other words, work needs to be done against a resistive torque produced by the generator as it turns, to produce electricity. In some embodiments, this is known as generator back torque, and this load is in addition to friction in the generator and any inertial effects.
  • a power takeoff converting energy, including desalinators, will produce a back load (force and/or torque) that opposes the load that is causing the energy conversion. This back load is a resistive load of the power takeoff.
  • wave induced force is shown to build 50 and 51, wherein the 51 force is greater than the 50 force, and the wave induced forces lead to a wave induced torque 100 and 101.
  • the wave induced load 100 builds up 101, as seen from fig 4a to 4b, as the buoy faces more of a particular wave.
  • 4a and 4b show the buildup of wave induced load within a threshold, wherein said threshold corresponds to the net magnetic attractive strength 200 of the magnetic coupler. In other words, the threshold corresponds to the point at which the coupler decouples.
  • the non threshold-exceeding wave induced load is transmitted to the power takeoff, via the magnetic coupler 16 in a coupled state.
  • the power takeoff increases in power output (work done per second), and the power takeoff resistive load increases, from 300 to 301 (FIG. 4a to 4b).
  • the power takeoff resistive load 301 increases to a point 302 wherein the resulting resistive load faced at the second magnetic unit 7 surpasses the maximum net magnetic strength 200 needed to sustain coupling between the first 6 and second 7 magnetic units, therefore the coupler will substantially decouple and the first magnetic unit 6 and the second magnetic unit 7 start to move with a relative motion, i.e. independently, thereby no longer transmitting the wave induced load 102 (or greater than 102) to the power takeoff.
  • motion transfer between the rotatory body and the restorative mechanism is not decoupled.
  • FIG. 6 another embodiment of the present invention is shown wherein a physical barrier is provided in between the two magnetic units of the magnetic coupler.
  • said physical barrier allows for water proofing between different compartments of a wave energy body, and the magnetic couplers allow for a seamless transfer of motion between said compartments.
  • FIG. 7 an embodiment of a magnetic unit is shown.
  • the magnetic unit 67 is one embodiment of any of the magnetic units 6 and 7, shown in previous drawings.
  • Permanent magnets can be expensive in large sizes especially for larger wave energy converters, therefore in order to reduce the mass and number of magnets needed to undertake magnetic transfer of motion within the coupling threshold, the embodiment shown in FIG. 7 comprises pockets 430 for magnet placement, wherein said magnets can be placed near the periphery of the magnetic unit, allowing for a high torque to manifest in a low force that is able to be accommodated by the magnetic attractive forces of the peripheral magnets.
  • the magnetic unit 67 comprises an inner ring 400, an interim region 410 and an outer ring 420.
  • the interim region 420 is between the inner ring 400 and outer ring 420.
  • the interim region 410 comprises at least one of: material gaps 416; and reduced thickness connection members 415 that connect the inner ring 400 to the outer ring 420.
  • the interim region comprises material that is of lower thickness than the inner and outer ring. This practice allows the use of less material to construct the magnetic unit. Material gaps also allow for less material usage.
  • subsequent magnets 10 within a given magnetic unit are arranged in an opposite configuration between each other.
  • FIG. 8 the embodiment of FIG. 7 is shown with magnets 10 now also shown, and said magnets 10 placed within said pockets 430. Although only one pole is visible per magnet, the other pole is on the opposite side of the shown magnet 10.
  • a plate 500 is shown, which in some embodiments is removable from the rest of the magnetic unit 67, with said plate ensuring that the magnets 10 will not fall out, especially due to attractive forces between adjacent magnetic units.
  • the magnet 10 is an electromagnet.
  • a mechanical coupler can be included in the wave energy system, wherein the coupler comprises a threshold after which the coupler passively decouples.
  • the mechanical coupler comprises a type of ratcheting gear that further comprises collapsible or retractable teeth that are kept erect by corresponding springs. When a force threshold is surpassed, the springs can no longer keep the teeth erect, causing the teeth to collapse and prevent motion transfer between the coupler.
  • the mechanical coupler stated herein replaces the magnetic coupler stated herein.
  • a physical connection or a physical couplement, between two or more components is one that has a physical motion transfer medium between said components, without any exclusively non-physical motion transfer interruption in said path.
  • the reaction body is the seafloor 20. In some embodiments, the reaction body is a body that is less responsive to water body wave motion compared to the absorber body, and is not the seafloor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

Le procédé et l'appareil divulgués dans la description concernent un convertisseur d'énergie houlomotrice (WEC) qui comprend un coupleur magnétique placé stratégiquement qui transfère sélectivement un mouvement à un système de prise de force (PTO) de façon à ne pas endommager les composants à l'intérieur de la bouée pendant des conditions de houle intense, tout en permettant toujours au mouvement d'être transféré à/depuis un mécanisme de restauration du WEC de sorte que les mouvements d'excitation et de restauration du convertisseur d'énergie houlomotrice ne sont pas inhibés par ledit transfert sélectif de mouvement à la PTO.
PCT/US2022/078183 2021-10-17 2022-10-16 Évitement de charge de pointe magnétique dans un système de conversion d'énergie houlomotrice Ceased WO2023064948A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US202163262636P 2021-10-17 2021-10-17
US63/262,636 2021-10-17
US202263269106P 2022-03-09 2022-03-09
US63/269,106 2022-03-09
US202263365486P 2022-05-28 2022-05-28
US63/365,486 2022-05-28
US202263366625P 2022-06-17 2022-06-17
US63/366,625 2022-06-17

Publications (1)

Publication Number Publication Date
WO2023064948A1 true WO2023064948A1 (fr) 2023-04-20

Family

ID=85988058

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2022/078183 Ceased WO2023064948A1 (fr) 2021-10-17 2022-10-16 Évitement de charge de pointe magnétique dans un système de conversion d'énergie houlomotrice

Country Status (1)

Country Link
WO (1) WO2023064948A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110018275A1 (en) * 2008-02-20 2011-01-27 Ocean Harvesting Technologies Ab Wave Power Plant and Transmission
US8546969B2 (en) * 2009-07-02 2013-10-01 Hydrocoil Power Inc. Ribbon drive power generation and method of use
US20140117673A1 (en) * 2012-10-29 2014-05-01 Reed E. Phillips Linear faraday induction generator for the generation of electrical power from ocean wave kinetic energy and arrangements thereof
US20180050764A1 (en) * 2016-08-03 2018-02-22 Mangrove Deep LLC Mooring system for drifting energy converters
US20180058420A1 (en) * 2016-08-22 2018-03-01 Brian Lee Moffat Wave energy device with constricted tube and generator pod
US10778063B2 (en) * 2013-07-02 2020-09-15 David Rodger Reducing bearing forces in an electrical machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110018275A1 (en) * 2008-02-20 2011-01-27 Ocean Harvesting Technologies Ab Wave Power Plant and Transmission
US8546969B2 (en) * 2009-07-02 2013-10-01 Hydrocoil Power Inc. Ribbon drive power generation and method of use
US20140117673A1 (en) * 2012-10-29 2014-05-01 Reed E. Phillips Linear faraday induction generator for the generation of electrical power from ocean wave kinetic energy and arrangements thereof
US10778063B2 (en) * 2013-07-02 2020-09-15 David Rodger Reducing bearing forces in an electrical machine
US20180050764A1 (en) * 2016-08-03 2018-02-22 Mangrove Deep LLC Mooring system for drifting energy converters
US20180058420A1 (en) * 2016-08-22 2018-03-01 Brian Lee Moffat Wave energy device with constricted tube and generator pod
US11009000B2 (en) * 2016-08-22 2021-05-18 Lone Gull Holdings, Ltd. Wave energy device with constricted tube and generator pod

Similar Documents

Publication Publication Date Title
JP6210245B2 (ja) 動力変換装置
EP2321526B1 (fr) Houlogénérateur
AU2011281672B2 (en) Ocean wave power plant
US20100064679A1 (en) Device for a winch-operated wave-power plant
AU2010320683B2 (en) Apparatus for extracting power from waves
CA2666259A1 (fr) Convertisseur d'energie des vagues
JP2016040466A (ja) 水流発電システムを輸送及び保守するためのシステム並びに方法
JP2013227963A (ja) 水流発電システム用のサブシステム
KR101751218B1 (ko) 파력발전용 동력변환장치
US20230063369A1 (en) Magnetic peak load aversion in a wave energy conversion system
JP2012503131A (ja) 海洋波力エネルギを変換する装置
WO2023064948A1 (fr) Évitement de charge de pointe magnétique dans un système de conversion d'énergie houlomotrice
CN106677971B (zh) 一种多功能系泊缆
WO2008048050A1 (fr) Convertisseur d'énergie des vagues
AU2015207492B2 (en) Wave energy convertor
WO2009080361A2 (fr) Système de production d'électricité
CN114941344A (zh) 一种多重缓冲式海上风电单桩基础防撞装置
WO2024102057A1 (fr) Dispositif de prise de puissance et unité de convertisseur d'énergie houlomotrice comprenant un tel dispositif de prise de puissance
US20220372947A1 (en) System and method for magnetic motion transfer in wave energy systems
CN223821946U (zh) 一种核电厂海面监测浮标装置
JPH08240174A (ja) 水面波エネルギ変換装置
CN216920420U (zh) 一种海上风电智慧防撞系统
US12168967B2 (en) Power take-off device and wave energy converter unit comprising such power take-off device
CN219712183U (zh) 一种用于柔性光伏支架减振的电涡流阻尼器
CN118532436A (zh) 一种用于抑制悬跨海缆振动的阻尼装置和使用方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22882074

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22882074

Country of ref document: EP

Kind code of ref document: A1