US20130205943A1 - Hub for flywheel and flywheel for energy storage having same - Google Patents

Hub for flywheel and flywheel for energy storage having same Download PDF

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Publication number
US20130205943A1
US20130205943A1 US13/877,158 US201113877158A US2013205943A1 US 20130205943 A1 US20130205943 A1 US 20130205943A1 US 201113877158 A US201113877158 A US 201113877158A US 2013205943 A1 US2013205943 A1 US 2013205943A1
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Prior art keywords
dome
hub
winding
rotor
sub
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US13/877,158
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English (en)
Inventor
Sung Kyu Ha
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Industry University Cooperation Foundation IUCF HYU
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Industry University Cooperation Foundation IUCF HYU
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Assigned to INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY ERICA CAMPUS reassignment INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY ERICA CAMPUS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HA, SUNG KYU
Publication of US20130205943A1 publication Critical patent/US20130205943A1/en
Assigned to INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY reassignment INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY ERICA CAMPUS
Abandoned 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
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G3/00—Other motors, e.g. gravity or inertia motors
    • F03G3/08—Other motors, e.g. gravity or inertia motors using flywheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/02—Supporting web roll
    • B65H18/023—Supporting web roll on its outer circumference
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/30—Flywheels
    • F16F15/305—Flywheels made of plastics, e.g. fibre reinforced plastics [FRP], i.e. characterised by their special construction from such materials
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/30—Flywheels
    • F16F15/315—Flywheels characterised by their supporting arrangement, e.g. mountings, cages, securing inertia member to shaft
    • F16F15/3153—Securing inertia members to the shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J15/00—Systems for storing electric energy
    • H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
    • 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
    • H02K7/02—Additional mass for increasing inertia, e.g. flywheels
    • H02K7/025—Additional mass for increasing inertia, e.g. flywheels for power storage
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/50—Energy storage in industry with an added climate change mitigation effect
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2117—Power generating-type flywheel
    • Y10T74/2119—Structural detail, e.g., material, configuration, superconductor, discs, laminated, etc.

Definitions

  • the present invention relates to an energy storage flywheel, and more particularly, to a dome type hub formed by winding a composite material in multiple layers to enhance strength and stiffness of a hub for connecting a rotor and a rotational shaft of a flywheel in order to improve energy storage capacity and an energy storage flywheel using the same.
  • a lifespan of the power generation facility is reduced in the output variation procedure described above, and minor mismatch between a demand amount and a supply amount causes various problems such as a decrease in quality of electric power.
  • the flywheel energy storage system is a device that rotates a motor using dump power, stores inertial energy of an attached rotational body, and converts the inertial energy into electric energy to use when necessary.
  • the flywheel energy storage system has advantageous in that energy storage efficiency is high, an instantaneous charge or discharge is possible, and a lifespan of energy is increased, a decrease in performance does not occur in a low temperature, compared to an existing mechanical energy storage device and a chemical energy storage device.
  • the system has been used in various fields to the military sector from the private sector such as an auxiliary power unit of an electric vehicle, an uninterruptable power supply, a pulse power generator, and an artificial satellite.
  • the flywheel energy storage system includes a flywheel rotor for storing inertial energy generated when rotating, a motor for driving the flywheel rotor, a generator for generating electrical power, a controller for controlling an input and output of power, a magnetic bearing serving as a peripheral device, and a housing.
  • the flywheel includes a rotor, a rotational shaft and a hub for fixing the rotor and the rotational shaft.
  • the hub needs to connect them.
  • the hub needs to easily expand when the flywheel rotates to connect the rotational shaft and the rotor, and also need to be deformed to transfer torque of the rotational shaft to the rotor.
  • Rotational motion energy capable of being stored in the flywheel energy storage system is expressed by the following equation.
  • energy stored in the flywheel is proportional to linearly a polar moment of inertia and the square of the rotation speed.
  • the rotation speed other than a size of the flywheel is highly efficient to increase the stored energy.
  • the composite material is fatally damaged by low-strength tensile stress in a radial direction among internal stresses, multiple layers of rings made from the composite material are combined, and an inner ring of the composite material expands toward an outer ring of the composite material, so that the stress may not occur.
  • the hub for connecting the rotor and the rotational shaft needs to easily expand in the radial direction, and thus it requires that the hub is designed to easily expand in the radial direction. That is, when the flywheel rotates at a high speed, the hub may be separated from the rotor, so that it is necessary to consider a concern about a firm bond between the hub and the rotor.
  • the rotor and the hub of flywheel are required to be designed so as to set the number of resonance rotations for avoiding the number of operation rotations and to reduce the internal stress generated during the high-speed rotation.
  • FIG. 1 is a cutaway perspective view of a conventional flywheel using a split dome type hub
  • FIG. 2 is a cutaway perspective view illustrating the hub of FIG. 1 (see Korea Patent Laid-Open Publication No. 10-2006-0066765).
  • a plurality of slits 22 is formed in a hub 50 in contact with an inner surface of a rotor 10 in a shaft direction of a rotational shaft 30 , and when the flywheel is rotated at a high speed, divided portions, that is, the slits 22 expand in a radial direction by a centrifugal force to allow the hub to apply a compressive force to the inner surface of the rotor, so that it is possible to reduce tensile stress generated in the radial direction of the rotor 10 during the high-speed rotation, and it is possible to prevent the rotor 10 and the hub 50 from being separated from each other.
  • the hub 50 are fixed to the rotational shaft 30 in two or more portions, and thus it is possible to avoid resonance by allowing a resonance frequency of the flywheel t be higher than the operation speed thereof.
  • split-wing portions that is, portions divided by the slits are moved in the radial direction by the centrifugal force during the high-speed rotation, so that stress concentration may occur at ends of the wing portions, that is, both ends of the slits.
  • a stress concentration poses a problem that the hub is damaged.
  • the flywheel in order to increase the stored energy, the flywheel needs to rotate at a high speed, and the composite material is appropriate to reduce the tensile stress and increase the strength. For this reason, the rotor formed by winding the composite material in multiple layers is used.
  • the rotor formed in the multi-layered composite material has a weakness that the rotor has high strength in a circumference direction but has low strength in the radial direction. That is, during the high-speed rotation, the wound composite material may be tore in the radial direction. Thus, a gap may be generated between the hub and the rotor, or the hub may be separated and deviated from the rotor.
  • the hub In order to prevent the rotor and the hub from being separated, the hub also needs to expand in the radial direction. In this way, it is possible to prevent the rotor and the hub from being separated from each other.
  • the hub needs to expand in not only the radial direction. Besides, the hub needs to have enough strength so as not to be damaged during the high-speed rotation and the hub also needs to have a structure or a shape capable of increasing the resonance frequency of the flywheel.
  • the present invention provides a hub for a flywheel and an energy storage flywheel having the same, capable of being easily manufactured and preventing the hub from being damaged due to stress concentration, since the hub is of a light weight and high strength and easily expands due to the high-speed rotation by forming a dome-shaped hub by winding a composite material in multiple layers.
  • the present invention provides a hub for a flywheel and an energy storage flywheel having the same, formed in a shape and made from a material capable of firmly maintaining a bonded state between the rotor and the hub by following the deformation of the rotor during the high-speed rotation of the flywheel, and adjusting the stiffness thereof.
  • a hub for a flywheel that is provided between a rotor and a rotational shaft of a flywheel to allow the rotor to have the same rotation speed as that of the rotational shaft.
  • the hub includes a hollow main dome in which a through hole into which the rotational shaft is inserted is formed in one end and an opening is formed in the other end in a longitudinal direction of the rotational shaft, and that is formed by winding a composite material therearound; and a sub dome that is bonded to the rotor and is formed by winding the composite material around an outer surface of the main dome. Any one of the main dome and the sub dome may expand in a radial direction of the rotational shaft along with the rotation of the rotational shaft and the rotor to allow the sub dome and the rotor to be maintained at a bonded state therebetween.
  • the sub dome may include a first sub dome wound around the outer surface of the main dome and a second sub dome wound around an outer surface of the first sub dome, and the main dome, the first sub dome and the second sub dome may have different winding angles from each other.
  • the first sub dome may have a winding angle smaller than that of the main dome, and the second sub dome may have a winding angle smaller than that of the first sub dome.
  • a winding thickness of the main dome may be thinner than that of the first sub dome and may be thicker than that of the second sub dome.
  • the first sub dome may have a winding start position different from that of the second sub dome with respect to the outer surface of the main dome.
  • the winding start position of the first sub dome may be close to the through hole than the winding start position of the second sub dome.
  • the winding start position of the first sub dome may be located at an outer surface of a cone-shaped portion of the main dome.
  • a winding thickness of the main dome near the through hole may be thicker than a winding thickness of the main dome near the opening.
  • an energy storage flywheel including a rotor that stores rotational motion energy as inertial energy and is formed by winding a composite material in multi layers therearound; a rotational shaft that is arranged to penetrate through an inner side of a hollow portion formed in the rotor; and a hub that is provided between the hollow portion of the rotor and the rotational shaft to connect the rotational shaft and the rotor, and compensates a shape change of the rotor when the rotor is rotated.
  • the hub may include a hollow main dome in which a through hole into which the rotational shaft is inserted is formed in one end and an opening is formed in the other end and is formed by winding the composite material therearound, and a sub dome that is bonded to the rotor and is formed by winding the composite material around an outer surface of the main dome.
  • the sub dome may include a first sub dome wound around the outer surface of the main dome and a second sub dome wound around an outer surface of the first sub dome, and the first sub dome may have a winding angle smaller than that of the main dome, and the second sub dome may have a winding angle smaller than that of the first sub dome.
  • the first sub dome may have a winding start position different from that of the second sub dome with respect to the outer surface of the main dome.
  • a winding start position of the first sub dome may be close to the through hole than a winding start position of the second sub dome.
  • the hub may be provided by at least two in multi layers in a longitudinal direction of the rotational shaft.
  • a bonded state between the hub and the rotor may be maintained during the rotation by winding the composite material in multiple layers therearound so as to be expandable in a radial direction of the rotational shaft.
  • a hub for a flywheel and an energy storage flywheel having the same in accordance with the present invention by manufacturing a dome-shaped hub by winding a composite material in multiple layers, it is possible to easily manufacture the hub, and it is possible to allow the hub to easily expand due to the rotation. Further, since the hub is light in weight and has high strength compared to metal, it is possible to prevent the hub from being damaged due to stress concentration during the high-speed rotation of the flywheel.
  • the hub since the hub does not easily expand in a portion adjacent to a rotational shaft but easily expands in a portion adjacent to a rotor, the hub has high strength and high resonance frequency while easily connecting the rotational shaft and the rotor during the high-speed rotation of the flywheel, so that it is possible to prevent a resonance phenomenon.
  • the stiffness of the hub can be adjusted so as to correspond to the rotation speed of the flywheel, and it is possible to use an inner space or a lower space of the hub since the hub has a dome shape.
  • a hub for a flywheel and an energy storage flywheel having the same in accordance with the present invention since a plurality of hubs is manufactured through integrally winding and cutting, it is possible to maintain identity or uniformity in quality between the plurality of hubs.
  • FIG. 1 is a cutaway perspective view of a conventional flywheel having a split dome type hub.
  • FIG. 2 is a cutaway perspective view of the hub shown in FIG. 1 .
  • FIG. 3 shows diagrams illustrating a process of manufacturing a hub for a flywheel according to an embodiment of the present invention.
  • FIG. 4 shows diagrams illustrating a process of winding the hub for a flywheel according to the embodiment of the present invention.
  • FIG. 5 is a traversal cross-sectional view of the hub for a flywheel shown in FIG. 4( c ).
  • FIG. 6 is a cutaway perspective view illustrating various shapes of the hub for a flywheel according to the embodiment of the present invention.
  • FIG. 7 is a cutaway perspective view illustrating a flywheel at which the hub for a flywheel according to the embodiment of the present invention is provided.
  • FIG. 8 is a cutaway perspective view illustrating an exploded state of the hub shown in FIG. 7 .
  • FIG. 9 is a cutaway perspective view illustrating a flywheel at which the hub for a flywheel according to the embodiment of the present invention is provided in another manner.
  • FIG. 3 shows diagrams illustrating a process of manufacturing a hub for a flywheel according to an embodiment of the present invention.
  • a hub for a flywheel 300 is configured to connect a rotor and a rotational shaft of a flywheel, and is manufactured by a filament winding method.
  • the hub for a flywheel 300 is obtained by a manufacturing method including a step of winding a composite material, a step of hardening the wound composite material, a step of cutting the hardened form.
  • a composite material 301 is wound by the filament winding method to form a hollow pressure vessel shape.
  • the composite material 301 is a material obtained by coating a reinforcing fiber material such as a carbon fiber, a glass fiber or a fiber mixture of the carbon fiber and the glass fiber with thermosetting resin such as epoxy.
  • the composite material 301 described above is obtained by using various kinds of fibers in addition to the carbon fiber and the glass fiber, and may be obtained by mixing other types of fibers when necessary.
  • the filament winding method refers to a method in which air included in a surface of the reinforcing fiber material is substituted with the thermosetting resin, and the reinforcing fiber material is consecutively wound around a mandrel at a certain winding angle while the resin is impregnated in the reinforcing fiber material.
  • Such a filament winding method is classified into a dipping manner and a drum manner according to an impregnating method of resin.
  • the dipping manner is a manner of impregnating the reinforcing fiber material with the resin in an impregnating bath filled with a resin liquid
  • the drum manner is a manner of impregnating the reinforcing fiber material with the resin on a drum being rotated.
  • the filament winding method is classified into a hoop manner and a helical manner according to a winding manner.
  • the hoop manner is a manner in which a filament, that is, the composite material 301 is vertically wound around the mandrel
  • the helical manner is a manner in which the composite material 301 is wound around the mandrel so as to form a large angle with a rotational shaft 100 of the mandrel.
  • the composite material 301 is wound by the helical manner to form both ends in a dome shape.
  • the composite material 301 may be wound by the hoop manner, when necessary.
  • the filament winding method has benefits in that the cost of the material to be used is low, the cost of labor is low, and the reproduction of the product is enhanced because uniformity in manufacturing processes is achieved when a computer control or a robot is used.
  • Such a filament winding method is usually used in manufacturing a composite pressure vessel.
  • FIG. 3( b ) illustrates a state where the winding step is completed.
  • the composite material 301 is wound so as to have a different thickness for each zone, if necessary.
  • a winding angle of the composite material 301 is determined.
  • the stiffness, strength, and deformation rate of the hub 300 to be manufactured are determined.
  • Such elements may be determined through a finite element analysis or a structure analysis.
  • the hardening step is a step of hardening the composite material 301 wound around the mandrel.
  • the cutting step is a step of cutting the both ends of the composite material 301 wound in the pressure vessel shape as shown in FIG. 3( b ) in the dome shape.
  • the hub 300 according to the embodiment of the present invention uses two dome-shaped hubs 300 obtained by symmetrically cutting the pressure vessel shaped component manufactured by the same filament winding method, and thus the uniformity between the two dome-shaped hubs 300 may be maintained. Accordingly, when the dome-shaped hubs 300 obtained through cutting is used for the flywheel, even if the hubs rotate at a high speed, it is possible to prevent any one of the hubs 300 from having an abnormal dimension or being damaged.
  • the hub 300 obtained by the cutting step described above has a dome shape whose an outer surface protrudes in a convex shape in one direction and an inner surface is hollow in a concave shape in one direction, and is formed by winding the composite material 301 therearound.
  • the hub 300 in a dome shape, it is possible to prevent the hub from shaking in a vertical direction, it is possible to improve the stiffness thereof in a radial direction, and it is possible to allow the hub to easily expand in the radial direction.
  • the hub 300 by manufacturing the filament winding method of the composite material as described above, the hub can be easily manufactured. Further, since the hub is manufactured using the composite material, the hub having a high expansion rate and a high stiffness are obtained, so that it is possible to increase a resonance frequency thereof. If necessary, an outer diameter and an inner diameter of the dome-shaped hub 300 may be further processed or blasted.
  • FIG. 4 is a diagram illustrating a process of winding the hub for a flywheel according to the embodiment of the present invention
  • FIG. 5 is a transversal cross-sectional view of the hub for a flywheel shown in FIG. 4( c ).
  • the hub for a flywheel 300 includes a hollow main dome 300 a in which a through hole 302 into which the rotational shaft is inserted is formed in one end thereof and an opening 303 is formed in the other end thereof in a longitudinal direction of the rotational shaft and that is formed by winding the composite material 301 therearound; and sub domes 300 b and 300 c that are bonded to the rotor and are formed by winding the composite material 301 around an outer surface of the main dome 300 a .
  • the rotor and the hub 300 , and the rotor and the sub domes 300 b and 300 c can maintain at a bonded state therebetween.
  • the composite material 301 made from the same composition as or similar to that of the rotor is preferably wound around the hub 300 .
  • the sub domes 300 b and 300 c may include a first sub dome 300 b wound around the outer surface of the main dome 300 a and a second sub dome 300 c wound around an outer surface of the first sub dome 300 b . That is, the sub domes 300 b and 300 c may include at least two winding layers of the composite material.
  • FIGS. 4 and 5 illustrate the hub 300 in which the sub domes 300 b and 300 c include two winding layers, the present invention is not limited thereto.
  • the sub domes may include multiple layers depending on design requirements such as necessary stiffness.
  • the main dome 300 a , the first sub dome 300 b , and the second sub dome 300 c may have different winding angles.
  • the sub domes 300 b and 300 c may include the first sub dome 300 b wound around the outer surface of the main dome 300 a and the second sub dome 300 c wound around the outer surface of the first sub dome 300 b , and the main dome 300 a , the first sub dome 300 b , and the second sub dome 300 c may be formed by winding the composite material therearound so as to form different winding angles to each other.
  • an angle ⁇ 1 of winding the composite material around the main dome 300 a an angle ⁇ 2 of winding the composite material around the first sub dome 300 b , and an angle ⁇ 3 of winding the composite material around the second sub dome 300 c are different to each other.
  • the rotor is deformed in the radial direction, and thus the hub 300 can also expand or be deformed in the radial direction. As a result, the rotor and the hub 300 can firmly maintain a bonded state therebetween.
  • the winding angle ⁇ 2 of the first sub dome 300 b may be smaller than the winding angle ⁇ 1 of the main dome 300 a
  • the winding angle ⁇ 3 of the second sub dome 300 c may be smaller than the winding angle ⁇ 2 of the first sub dome 300 b .
  • a thickness of winding the composite material around the main dome 300 a may be thinner than a thickness of winding the composite material around the first sub dome 300 b , and be thicker than a thickness of winding the composite material around the second sub dome 300 c .
  • the inner-side winding further expands in the radial direction to push the outer-side winding toward the rotor during the high-speed rotation, so that the hub 300 can be prevented from being separated from the rotor.
  • the main dome 300 a , the first sub dome 300 b , and the second sub dome 300 c constituting the hub 300 may be formed such that start positions of winding the composite material therearound are different to each other. That is, the first sub dome 300 b may be wound around the outer surface of the main dome 300 a from the winding start position different from that of the second sub dome 300 c.
  • the main dome 300 a is formed by winding the composite material around the entire mandrel
  • the first sub dome 300 b is formed by winding the composite material around a cylindrical portion of the main dome 300 a and parts of cone-shaped portions of both ends of the cylindrical portion.
  • the second sub dome 300 c is wound around only a cylindrical portion of the first sub dome 300 b .
  • three winding layers are formed on a cylindrical portion of the hub 300
  • two winding layers or one winding layer is formed on both ends of the cylindrical portion thereof.
  • the winding start positions of the composite material can be different to each other such that overlapped winding portions of the composite material are different to each other, it is possible to adjust the stiffness required for the hub 300 .
  • the winding start positions can be determined in a design phase through the structure analysis.
  • a start position A of winding the composite material around the first sub dome 300 b may be close to the through hole 302 than a start position of winding the composite material around the second sub dome 300 c , and the start position A of winding the composite material around the first sub dome 300 b is located at an outer surface of a cone-shaped portion of the main dome 300 a.
  • multiple layers are wound around a portion near the opening 303 of the hub 300 .
  • the multiple layers of the composite material are preferably wound around a portion which expands in the radial direction during the high-speed rotation.
  • a winding thickness B of the main dome 300 a near the through hole 303 may be thicker than a winding thickness C thereof near the opening 303 .
  • the winding B near the through hole 302 needs to maintain a bonded state between the rotational shaft and the hub 300 even during the high-speed rotation. To achieve this, it is preferable to thickly wind so as to prevent the hub 300 from expanding even during the high-speed rotation. In contrast, it is preferable to wind around the portion of the hub 300 near the opening 303 to have a relatively thin thickness so as to easily expand during the high-speed rotation.
  • an energy storage flywheel 10 (see FIG. 7 ) according to an embodiment of the present invention stores rotational motion energy as inertial energy.
  • the energy storage flywheel 10 includes a rotor 200 (see FIG. 7 ) formed by winding the composite material in multiple layers; a rotational shaft 100 (see FIG. 7 ) arranged to penetrate through an inner side of a hollow portion formed in the rotor 200 ; and the hub 300 that is provided between the rotational shaft 100 and the hollow portion of the rotor 200 to connect the rotational shaft 100 and the rotor 200 and that compensates for a shape change of the rotor 200 when the rotor is rotated.
  • the hub 300 includes the hollow main dome 300 a in which the through hole 302 into which the rotational shaft is inserted is formed in the one end thereof and the opening 303 is formed in the other end thereof in the longitudinal direction of the rotational shaft and that is formed by winding the composite material 301 therearound; and the sub domes 300 b and 300 c that are bonded to the rotor and are formed by winding the composite material 301 around the outer surface of the main dome 300 a.
  • the hub 300 may be configured such that at least two hubs are formed in multi-layers in the longitudinal direction of the rotational shaft 100 .
  • the hub 300 is configured such that the composite material is wound in multiple layers to expend in the radial direction of the rotational shaft 100 , so that a bonded state between the hub 300 and the rotor 200 can be maintained during the rotation.
  • FIG. 6 shows cutaway perspective views of various shapes of the hub for a flywheel according to the embodiment of the present invention
  • FIG. 7 is a cutaway perspective view of a flywheel at which the hub for a flywheel according to the embodiment of the present invention is provided
  • FIG. 8 is a cutaway perspective view illustrating an n exploded state of the hub shown in FIG. 7
  • FIG. 9 is a cutaway perspective view illustrating a flywheel at which the hub for a flywheel according to the embodiment of the present invention is provided in another manner.
  • the hub for a flywheel 300 may use various shapes such as a single dome or a combination of two or more domes. That is, the hub 300 according to the embodiment of the present invention may be formed in multiple layers such as three or more layers by coupling multiple domes to each other, in addition to two layers.
  • each dome can be adjusted by using various types of composite materials.
  • a fiber of high stiffness is used, the structural stiffness of the dome is improved, whereas the dome does not expand during the rotation.
  • a fiber of low stiffness is used, the structural stiffness of the dome is degraded, whereas the dome easily expands during the rotation.
  • a type of the fiber used for the dome type composite hub 300 may be determined using such properties.
  • a mixed fiber of two or more fibers may be used.
  • the hub 300 is assembled between the rotational shaft 100 and the rotor 200 constituting the flywheel 10 .
  • An outer-diameter portion having a large diameter is in contact with an inner surface of the rotor 200
  • an inner-diameter portion having a small diameter is in contact with the rotational shaft 100 while surrounding the rotational shaft 100 .
  • the energy storage flywheel 10 includes the rotational shaft 100 ; the rotor 200 surrounding the rotational shaft 100 while being spaced apart from the rotational shaft 100 ; and the hub 300 arranged between the rotational shaft 100 and the rotor 200 to connect the rotational shaft 100 and the rotor 200 .
  • the hub 300 is formed by manufacturing the composite material 301 by the filament winding method.
  • a hub 300 is preferably assembled between the rotational shaft 100 and the rotor 200 in a press-fit manner. That is, an inner diameter of the hub 300 is slightly smaller than a diameter of the rotational shaft 100 , and an outer diameter of the hub 300 is slightly larger than an inner diameter of the rotor 200 . Then, the rotational shaft 100 and/or the hub 300 are cooled or compressed by a press to be assembled in the press-fit manner.
  • the hub 300 is formed to have the inner diameter slightly smaller than the diameter of the rotational shaft 100 , and then the rotational shaft 100 is cooled or compressed by a press. Thereafter, the inner diameter of the hub 300 is assembled in the press-fit manner.
  • the hub 300 is formed to have the outer diameter slightly larger than the inner diameter of the rotor 200 , and then the hub 300 is cooled or compressed by a press. Thereafter, the hub 300 is assembled into the inner diameter of the rotor 200 by the press-fit manner.
  • the hub 300 can continuously connect the rotor 200 and the rotational shaft 100 .
  • the hub 300 when the hub 300 is configured such that two domes are coupled, the hub 300 includes a first hub 310 and a second hub 320 , as shown in FIGS. 7 and 8 .
  • FIG. 6( b ) illustrates a case where the first hub 310 and the second hub 320 are coupled so as to protrude in the same direction
  • FIG. 6( c ) illustrates a case where the first hub 310 and the second hub 320 are coupled so as to protrude in an opposite direction to each other.
  • a first inner-diameter portion 311 in contact with the rotational shaft 100 and a first outer-diameter portion 312 having a diameter greater than that of the first inner-diameter portion 311 are formed at the first hub 310 .
  • a second inner-diameter portion 321 surrounding the first outer-diameter portion 312 of the first hub 310 and a second outer-diameter portion 322 having a diameter greater than that of the second inner-diameter portion 321 and in contact with an inner surface of the rotor 200 are formed at the second hub 320 .
  • the diameter of the first inner-diameter portion 311 is smaller than the diameter of the rotational shaft 100
  • the diameter of the first outer-diameter portion 312 is greater than the diameter of the second inner-diameter portion 321
  • the diameter of the second outer-diameter portion 322 is greater than the inner diameter of the rotor 200 .
  • the hub 300 is assembled between the rotational shaft 100 and the rotor 200 in the press-fit manner, and the first outer-diameter portion 312 of the first hub 310 and the second inner-diameter portion 321 of the second hub 320 may be coupled using epoxy.
  • an interference amount between the rotational shaft 100 and the hub 300 is previously set, that is, the first inner-diameter portion 311 of the first hub 310 is set to be smaller than the diameter of the rotational shaft 100 to be able to assemble in the press-fit manner.
  • a part or all of an expansion amount generated when the hub 300 rotates is previously applied when the hub is stopped, and thus a stress applied to the hub 300 can be reduced.
  • an extension percentage of the first inner-diameter portion 311 due to centrifugal force is equal to or less than that of the rotational shaft 100
  • an extension percentage of the first outer-diameter portion 312 is greater than that of the first inner-diameter portion 311 and is equal to or greater than that of the second inner-diameter portion 321
  • An extension percentage of the second outer-diameter portion 322 is greater than those of the first outer-diameter portion 312 and the second inner-diameter portion 321 and is equal to or greater than that the inner surface of the rotor 200 .
  • the hub 300 can be constantly coupled to the rotational shaft 100 and the rotor 200 without being separated therefrom during the rotation of the flywheel.
  • the first outer-diameter portion 312 of the first hub 310 and the second inner-diameter portion 321 of the hub 320 are made from the same composite material, so that the extension percentages thereof can be further easily adjusted.
  • the hub 300 may be attached by one or two or more. Two hubs 300 may be attached in the same direction as shown in FIG. 7 , and the two hubs 300 may be attached in the opposite direction to each other as shown in FIG. 9 in order to secure a space.
  • the inner diameter of the hub 300 has the characteristic of the first inner-diameter portion 311 , and the outer diameter thereof has the characteristic of the second outer-diameter portion 322 .
  • a deformation rate of the outer diameter of the hub 300 in contact with the inner surface of the rotor 200 needs to be 1% or more, and a deformation rate of the inner diameter of the hub 300 in contact with the rotational shaft 100 needs to be 0.2% or less.
  • the hub 300 according to the embodiment of the present invention is formed by winding the composite material 301 therearound, so that the hub can be easily manufactured. Further, the hub is light in weight and has high strength, so that a resonance frequency thereof is increased. Thus, the rotation speed causing resonance of the flywheel is greater than an actual operation speed, so that it is possible to prevent the hub 300 and the flywheel from causing the resonance.
  • the rotational shaft 100 and the rotor 200 can be easily connected during the high-speed rotation of the flywheel.
  • the present invention can be applied to an energy storage device or the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US13/877,158 2010-10-01 2011-01-11 Hub for flywheel and flywheel for energy storage having same Abandoned US20130205943A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2010-0095756 2010-01-10
KR1020100095756A KR101009715B1 (ko) 2010-10-01 2010-10-01 플라이휠용 허브 및 이를 구비한 에너지 저장용 플라이휠
PCT/KR2011/000158 WO2012043940A1 (ko) 2010-10-01 2011-01-11 플라이휠용 허브 및 이를 구비한 에너지 저장용 플라이휠

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US15/153,732 Division US10056803B2 (en) 2010-01-10 2016-05-12 Manufacturing method of hub for flywheel

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106602787A (zh) * 2016-02-24 2017-04-26 国科天地科技有限公司 飞轮储能转子、系统、车间、工厂和基地及其应用设备
US10050491B2 (en) 2014-12-02 2018-08-14 Management Services Group, Inc. Devices and methods for increasing energy and/or power density in composite flywheel energy storage systems
US11146131B2 (en) * 2019-09-20 2021-10-12 Helix Power Corporation Composite rotor for flywheel energy storage system

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US9464685B2 (en) * 2013-02-07 2016-10-11 Orbital Atk, Inc. Composite dome connectors for flywheel rim to shaft attachment
WO2020263756A1 (en) * 2019-06-27 2020-12-30 Spencer Composites Corporation High speed flywheel
KR102320611B1 (ko) * 2021-06-11 2021-11-02 다우시스템 주식회사 돔 구조물과 태양광 패널이 서로 접합되어 밀폐기능을 유지하면서 태양광 발전을 지원하는 덮개 구조물

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US4603555A (en) * 1983-05-21 1986-08-05 The British Petroleum Company P.L.C. Apparatus for containing an energy storage flywheel
US4821599A (en) * 1983-10-22 1989-04-18 British Petroleum Company P.L.C. Energy storage flywheel
US4991462A (en) * 1985-12-06 1991-02-12 E. I. Du Pont De Nemours And Company Flexible composite ultracentrifuge rotor
US5566588A (en) * 1994-01-14 1996-10-22 Rosen Motors Lp Flywheel rotor with conical hub and methods of manufacture therefor
US5946979A (en) * 1994-11-16 1999-09-07 Forskningscenter Riso Flywheel
US5692414A (en) * 1994-12-23 1997-12-02 Hughes Aircraft Company Flywheel having reduced radial stress
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US10050491B2 (en) 2014-12-02 2018-08-14 Management Services Group, Inc. Devices and methods for increasing energy and/or power density in composite flywheel energy storage systems
US10715007B2 (en) 2014-12-02 2020-07-14 Management Services Group, Inc. Devices and methods for increasing energy and/or power density in composite flywheel energy storage systems
CN106602787A (zh) * 2016-02-24 2017-04-26 国科天地科技有限公司 飞轮储能转子、系统、车间、工厂和基地及其应用设备
US11146131B2 (en) * 2019-09-20 2021-10-12 Helix Power Corporation Composite rotor for flywheel energy storage system

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WO2012043940A1 (ko) 2012-04-05
US20160329776A1 (en) 2016-11-10
US10056803B2 (en) 2018-08-21
KR101009715B1 (ko) 2011-01-19

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