WO2012043939A1 - Preparation method of flywheel hub - Google Patents
Preparation method of flywheel hub Download PDFInfo
- Publication number
- WO2012043939A1 WO2012043939A1 PCT/KR2011/000157 KR2011000157W WO2012043939A1 WO 2012043939 A1 WO2012043939 A1 WO 2012043939A1 KR 2011000157 W KR2011000157 W KR 2011000157W WO 2012043939 A1 WO2012043939 A1 WO 2012043939A1
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- WIPO (PCT)
- Prior art keywords
- dome
- winding
- composite material
- hub
- subdome
- Prior art date
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- 238000002360 preparation method Methods 0.000 title abstract 3
- 238000004804 winding Methods 0.000 claims abstract description 126
- 239000002131 composite material Substances 0.000 claims abstract description 114
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 238000003780 insertion Methods 0.000 claims abstract description 13
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- 238000004519 manufacturing process Methods 0.000 claims description 39
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- 238000004146 energy storage Methods 0.000 description 16
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Classifications
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- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- 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
Definitions
- the present invention relates to a method for manufacturing a flywheel hub, and more specifically, to increase the energy storage capacity of the flywheel to manufacture a flywheel by winding the composite material in multiple layers to increase the strength and rigidity of the hub connecting the rotor and the rotation axis of the flywheel It relates to a method for producing a dragon hub.
- Flywheel energy storage system of the system for implementing such a technology is a device that uses the surplus power to rotate the motor and then stores the inertial energy of the attached rotor, and if necessary converts to electrical energy again.
- flywheel energy storage system advantages include better energy storage efficiency, instant charging and discharging, longer energy life, and no degradation at low temperatures compared to conventional mechanical and chemical energy storage devices.
- the flywheel energy storage system includes a flywheel rotor for storing inertial energy generated during rotation, a motor for driving the flywheel rotor, a generator for generating power, a controller for controlling input and output of power, and a magnetic bearing part and a housing as peripheral accessories. It is part.
- the flywheel is composed of a rotor and a rotating shaft and a hub for fixing them.
- the hub is easily inflated when the flywheel rotates to connect the rotating shaft and the rotor, and must be well deformed to transfer the torque of the rotating shaft to the rotor.
- the rigidity must be high to increase the resonant frequency of the rotary system, ie the flywheel, above the operating speed.
- the rotational kinetic energy that can be stored in this flywheel energy storage system is expressed as follows.
- the energy stored in the flywheel is linearly proportional to the square of the rotational speed, linear to the pole moment of inertia I of the flywheel.
- the radially low tensile stress in the internal stresses can cause fatal damage to the composites, so the combination of multiple layers of composite materials can be combined to extend the inner composite ring towards the outer composite ring. To reduce the stress generated.
- the hub connecting the rotor and the rotary shaft should also be well expanded in the radial direction, and therefore, the design of the hub with easy expansion in the radial direction should be presented. That is, when the flywheel rotates at a high speed, the hub tends to be separated from the rotor. Therefore, the bonding problem between the hub and the rotor must be considered.
- considerations in the design of the rotor and hub of the flywheel are the setting of the resonance speed to lower the internal stress generated during high speed rotation and to avoid the operating speed.
- FIG. 1 is a cutaway perspective view of a flywheel using a conventional split dome type hub
- FIG. 2 is a cutaway perspective view of the hub of FIG. 1 (see Publication No. 10-2006-0066765). .
- a plurality of slits 22 are formed in the axial direction of the rotation shaft 30 in the hub 50, which is in contact with the inner circumferential surface of the rotor 10, so that the flywheel is at high speed.
- the divided portion, that is, the slit 22 is unfolded in the radial direction by the centrifugal force so that the hub 50 exerts a compressive force on the inner surface of the rotor 10, thereby causing the radius of the rotor 10 to be generated at high speed rotation. It is possible to reduce the directional tensile stress and to prevent the separation between the rotor 10 and the hub 50.
- the hub 50 has two or more portions fixed to the rotation shaft 30 to increase the resonance frequency than the operating speed of the flywheel so as to avoid resonance.
- such a conventional split dome type hub has a stress concentration at the tip of the blade, i.e., at both ends of the slit 22, as the split blade, i.e., the portion divided by the slit 22, moves radially by the centrifugal force during the high speed rotation.
- the split blade i.e., the portion divided by the slit 22 moves radially by the centrifugal force during the high speed rotation.
- the flywheel in order to increase the stored energy, the flywheel must be rotated at a high speed, and the composite material is suitable for high speed rotation because the tensile stress can be lowered and the strength can be increased.
- the rotor is made of several layers formed by winding a composite material.
- a rotor made of a multi-layered composite material has a disadvantage of high strength in the circumferential direction but weak strength in the radial direction. That is, there is a disadvantage in that the wound composite material is torn in the radial direction at high speed. This may cause the hub to move between the rotor and the hub to be separated or detached from the rotor.
- the hub should also extend well in the radial direction. This will prevent the rotor and hub from separating.
- the hub should not only expand well in the radial direction, but also have a strength that does not break during high-speed rotation, and should have a structure or shape that can increase the resonant frequency of the flywheel.
- the present invention forms a dome-shaped hub by winding a multi-layered composite material, which is lighter and has higher strength than metal, and expands well according to high-speed rotation, thereby preventing the hub from being damaged by stress concentration during high-speed rotation of the flywheel. And it provides a manufacturing method of the hub for a flywheel easy to manufacture.
- the present invention provides a method for manufacturing a flywheel hub made of a shape and a material capable of maintaining a close contact between the rotor and the hub and adjusting the rigidity by following the deformation of the rotor during high speed rotation of the flywheel.
- the hollow pressure vessel by winding a composite material
- a winding step of forming a shape A curing step of curing the wound composite material;
- the method may include forming a hollow main dome and winding a composite material on an outer surface of the main dome at an angle different from that of the composite material forming the main dome to form a subdome.
- the forming of the sub dome may include winding a first sub dome on an outer surface of the main dome and a second sub dome on an outer surface of the first sub dome, and the main dome, the first sub dome and the second sub dome.
- the subdome can wind the composite material at different angles.
- the first subdome winds the composite material at an angle smaller than the winding angle of the main dome, and the second subdome is formed at an angle smaller than the winding angle of the first subdome. Can be wound.
- the main dome may wind the composite material to have a thickness smaller than the thickness of the first subdome, and may wind the composite material to have a thickness greater than the thickness of the second subdome. have.
- the first subdome may start winding the composite material at a position different from the starting position of the composite winding of the second subdome with respect to the outer surface of the main dome.
- the first subdome may start winding the composite material closer to the insertion hole than the starting position of the composite winding of the second subdome.
- the composite winding starting position of the first subdome may be located on an outer surface of the conical part of the main dome.
- the main dome may wind the composite material such that the thickness of the insertion hole side is greater than the thickness of the opening side.
- the forming of the sub-dome may control the radial stiffness of the hub by varying the starting position of the composite winding of the first sub dome and the second sub dome with respect to the outer surface of the main dome.
- the forming of the subdome may include winding the composite material such that the winding length of the composite material in the longitudinal direction of the rotating shaft increases in the order of the main dome, the first subdome and the second subdome.
- the manufacturing method of the flywheel hub according to the present invention by manufacturing a dome-shaped hub by winding the composite material in a multi-layer, it is easy to manufacture, the expansion is achieved by rotation, light and high strength compared to metal When the flywheel rotates at a high speed, the hub may be prevented from being damaged by the concentration of stress.
- the method for manufacturing a flywheel hub according to the present invention does not stretch well in the vicinity of the rotating shaft, but extends well in the vicinity of the rotor.
- the resonance frequency is high, so that the resonance phenomenon may not be caused.
- the manufacturing method of the hub for flywheel according to the present invention can adjust the rigidity of the hub in response to the rotational speed of the flywheel due to the hub formed by winding the composite material in multiple layers and utilize the inner or lower space of the hub Can be.
- the method for manufacturing a flywheel hub according to the present invention is integrally wound and then cut to obtain a plurality of hubs, it is possible to maintain quality equality or uniformity among the plurality of hubs.
- FIG. 1 is a cutaway perspective view of a flywheel using a conventional split dome type hub.
- FIG. 2 is a cutaway perspective view of the hub of FIG. 1.
- FIG. 2 is a cutaway perspective view of the hub of FIG. 1.
- Figure 3 is a view showing the manufacturing process of the flywheel hub according to an embodiment of the present invention.
- Figure 4 is a flow chart showing a process for manufacturing a flywheel hub according to an embodiment of the present invention.
- FIG. 5 is a view showing a winding process of the flywheel hub according to an embodiment of the present invention.
- FIG. 6 is a longitudinal partial cross-sectional view of the flywheel hub shown in FIG.
- Figure 7 is a perspective view of the various forms of the flywheel hub made by the manufacturing method according to an embodiment of the present invention.
- FIG. 8 is a cutaway perspective view of a flywheel equipped with a hub for a flywheel made by a manufacturing method according to an embodiment of the present invention.
- Figure 3 is a view showing the manufacturing process of the flywheel hub according to an embodiment of the present invention
- Figure 4 is a flow chart showing a process for manufacturing a flywheel hub according to an embodiment of the present invention.
- Flywheel hub 300 by connecting the rotor and the rotation axis of the flywheel, is manufactured by the filament winding method (Filament Winding Method).
- the flywheel hub 300 comprises the steps of winding the composite material (1100 ⁇ 1300), curing the wound composite material (1400) and It can be obtained by a manufacturing method including the step 1500 of cutting the cured shape.
- Winding the composite material (1100 ⁇ 1300), as shown in Figure 3 (a) is a step of winding the composite material 301 by the filament winding method to form a hollow pressure vessel shape.
- the composite material 301 is a material obtained by applying a thermosetting resin such as epoxy to a reinforcing fiber material such as carbon fiber, glass fiber or mixed fiber of carbon fiber and glass fiber.
- the composite material 301 may use various kinds of fibers in addition to carbon fibers and glass fibers, and may mix and use different kinds of fibers as necessary.
- the filament winding method is a method of winding the reinforcing fiber material in a mandrel continuously at a predetermined winding angle while impregnating the resin in the reinforcing fiber material by performing the substitution of air contained in the surface of the reinforcing fiber material and the thermosetting resin.
- the filament winding method is divided into a dipping method and a drum method according to the impregnation method of the resin.
- the dipping method is a method of impregnating the resin in the reinforcing fiber material in the impregnation tank filled with the resin liquid
- the drum method is a method of impregnating the resin in the reinforcing fiber material on the rotating drum.
- the filament winding method is divided into a hoop method and a helical method according to a winding method.
- the hoop method is a method in which the filament, that is, the composite material 301 is wound substantially perpendicular to the mandrel
- the helical method is a method in which the composite material 301 is wound while forming a large angle with the rotation axis 100 of the mandrel.
- the composite material 301 is wound in a helical manner so that both ends can be formed in a dome shape.
- the composite material 301 may be wound in a hoop manner.
- This filament winding method has the advantages of low cost, low labor cost, and uniformity of production process using computer control or robot, compared to other composite materials processing methods. have.
- This filament winding method is mainly used to fabricate composite pressure vessels.
- FIG. 3 (b) The completion of the winding steps 1100-1300 is illustrated in FIG. 3 (b).
- the thickness of the composite material 301 may be differently wound for each section as needed.
- the winding angle of the composite material 301 is determined.
- the rigidity, strength, strain, etc. of the hub 300 to be manufactured are determined. This can be determined. This can be determined through finite element analysis or structural analysis.
- the curing step 1400 is a step of curing the composite material 301 wound on the mandrel.
- the cutting step 1500 is a step of cutting both ends of the composite material 301 wound in the shape of a pressure vessel as shown in FIG. 3 (b) into a dome shape as shown in FIG. 3 (c).
- the hub 300 according to an embodiment of the present invention is the two dome-shaped hubs obtained by symmetrically cutting the parts of the pressure vessel shape manufactured by the same filament winding method ( 300 may be used, and the two domed hubs 300 may maintain uniformity between components. Therefore, even when the dome-shaped hub 300 obtained by cutting is used for the flywheel, it is possible to prevent a phenomenon in which any one of the hubs 300 is abnormal in size or breaks first even when rotating at a high speed.
- the hub 300 obtained by the cutting step 1500 as described above is formed in a dome shape in which the outer surface is convexly protruded in one direction, and the inner surface is concave in one direction, and the composite material 301 is formed. It is formed by winding.
- the hub 300 By forming the hub 300 in the shape of a dome as above, it is possible to prevent the flow in the vertical direction and to increase the rigidity in the radial direction, it can be easily expanded in the radial direction.
- the fabrication of the hub 300 is very easy, and because the composite is made of a composite material, the expansion rate is excellent and the rigidity is high, thereby increasing the resonance frequency. If necessary, the dome-shaped hub 300 may further process or polish an outer diameter and an inner diameter.
- FIG. 5 is a view illustrating a winding process of a flywheel hub according to an embodiment of the present invention
- FIG. 6 is a longitudinal cross-sectional view of the flywheel hub shown in FIG. 5C.
- the winding step (1100 ⁇ 1300) of the manufacturing method of the hub 300 according to an embodiment of the present invention is inserted into the rotary shaft at one end along the longitudinal direction of the rotary shaft Forming a hollow main dome 300a to form a hole 302 and an opening 303 at the other end 1100 and winding the composite material 301 on the outer surface of the main dome 300a. And forming the sub domes 300b and 300c (1200 and 1300).
- the flywheel hub 300 is formed with an insertion hole 302 is inserted into the rotary shaft at one end in the longitudinal direction of the rotary shaft and the opening 303 at the other end And a sub dome formed by winding the composite material 301 on the outer surface of the main dome 300a and the rotor having a hollow shape formed by winding the composite material 301. sub dome, 300b, 300c). At least one of the main dome 300a or the subdome 300b, 300c may be the hub 300 to the subdome 300b, 300c because the rotating shaft and the rotor may expand in the radial direction of the rotating shaft as the rotor rotates at a high speed. ) And the rotor can be maintained.
- the hub 300 is preferably wound with a composite material having the same or similar components as the rotor.
- the sub dome (300b, 300c) may include a first subdome (300b) is wound on the outer surface of the main dome (300a) and a second subdome (300c) is wound on the outer surface of the first subdome (300b) Can be. That is, the subdomes 300b and 300c may include at least two composite winding layers. 5 and 6 illustrate a hub 300 in which the subdomes 300b and 300c include two winding layers, but the present invention is not limited thereto, and the subdome may have a plurality of windings according to design requirements such as necessary rigidity. It may be made of layers.
- the main dome 300a, the first sub dome 300b and the second sub dome 300c may have different winding angles.
- forming the sub dome (300b, 300c) (1200, 1300) is the step of winding the first sub dome (300b) on the outer surface of the main dome (300a) (1200) and the first sub dome (300b) Winding the second sub-dome 300c on the outer surface of the step 1300, and the main dome 300a, the first sub-dome 300b and the second sub-dome 300c have different angles of the composite material. It can be formed by winding. As shown in FIG. 5, the angle ⁇ 1 of winding the composite material of the main dome 300a, the angle ⁇ 2 of winding the composite material of the first subdome 300b, and the second subdome 300c of the second dome 300c.
- the angles ⁇ 3 for winding the composite material are different from each other.
- the rigidity of the hub 300 may be increased by changing the composite winding angles of the main dome 300a, the first sub dome 300b, and the second sub dome 300c constituting the hub 300.
- the degree of radial expansion may be different for each of the main dome 300a, the first subdome 300b, and the second subdome 300c. Because of this, by following the radial deformation of the rotor when the flywheel rotates at high speed, the hub 300 may also be well inflated or deformed in the radial direction, and the adhesion between the rotor and the hub 300 may be maintained firmly.
- the first sub dome 300b winds the composite material at an angle smaller than the winding angle of the main dome 300a, and the second sub dome 300c. May wind the composite material at an angle smaller than the winding angle of the first subdome 300b.
- the winding angle ⁇ 2 of the first subdome 300b is smaller than the winding angle ⁇ 1 of the main dome 300a
- the winding angle ⁇ 3 of the second subdome 300c is the first subdome ( It may be formed smaller than the winding angle ⁇ 2 of 300b).
- the main dome 300a winds the composite material to have a thickness smaller than that of the first subdome 300b and the second subdome 300c.
- the composite material can be wound to have a thickness greater than the thickness of).
- the composite winding thickness of the main dome 300a is smaller than the composite winding thickness of the first subdome 300b and larger than the composite winding thickness of the second subdome 300c, thereby forming the inner winding 300a and the outer winding.
- the hub 300 can be prevented from escaping from the rotor because the inner winding expands more radially and pushes the outer winding toward the rotor during high-speed rotation. have.
- the first sub-dome 300b is different from the starting position of the composite winding of the second sub-dome 300c with respect to the outer surface of the main dome 300a. You can start winding the composite at.
- the main dome 300a, the first subdome 300b, and the second subdome 300c constituting the hub 300 may be formed to have different positions at which the composite material starts winding. That is, the first sub dome 300b may have a winding start position different from the composite winding start position of the second sub dome 300c with respect to the outer surface of the main dome 300a.
- Steps 1200 and 1300 of forming the sub-domes 300b and 300c may be performed by varying the starting positions of the composite windings of the first sub dome 300b and the second sub dome 300c with respect to the outer surface of the main dome 300a.
- the radial stiffness of the hub 300 can be adjusted.
- the main dome 300a winds the composite material over the entire mandrel, while the first subdome 300b has a cylindrical portion and a conical portion at both ends of the cylindrical portion of the main dome 300a. You can see that it winds up a bit.
- the second subdome 300c is wound only on the cylindrical portion of the first subdome 300b.
- three winding layers are formed on the cylindrical portion of the hub 300 while only two or one winding layer is formed on both ends of the cylindrical portion.
- the stiffness required by the hub 300 may be adjusted by changing the winding start position of the composite material such that the portions where the composite material is overlapped are differently wound. At this time, the determination of the starting position of the winding can be determined at the design stage through structural analysis.
- the first sub-dome (300b) is closer to the insertion hole 302 than the composite winding start position of the second sub-dome (300c) May start winding, and the composite winding starting position of the first sub dome 300b may be located on an outer surface of the cone portion of the main dome 300a.
- the composite winding start position A of the first subdome 300b is closer to the insertion hole 302 of the hub 300 than the composite winding start position of the second subdome 300c. It may be formed close, the composite winding start position (A) of the first sub dome (300b) may be located on the outer surface of the conical portion of the main dome (300a).
- the opening 303 side of the hub 300 is wound in a plurality of layers. It is desirable to form a composite winding of.
- the main dome 300a may wind the composite material such that the thickness of the insertion hole 302 is greater than the thickness of the opening 303.
- the main dome 300a may have a winding thickness B at the insertion hole 302 greater than a winding thickness C at the opening 303 side.
- Winding (B) of the insertion hole 302 side should be able to maintain the adhesive state of the rotating shaft and the hub 300 even at high speed rotation, for this purpose it is preferable to winding thick so that the hub 300 does not expand even at high speed rotation.
- the winding of the opening 303 side of the hub 300 is preferably wound to have a relatively thin thickness so that it can easily expand during high-speed rotation.
- forming the sub dome (300b, 300c) (1200, 1300) is the winding length of the composite material in the longitudinal direction of the rotation axis is the main dome (300a), the first subdome (300b) and the second subdome ( The composite material can be wound up in order of 300c).
- the winding length of the main dome 300a is the longest along the longitudinal direction of the rotation axis, the winding length of the first subdome 300b is next, and the winding of the second subdome 300c.
- the smallest length As such, the windings are gradually shortened with respect to the longitudinal direction of the rotation axis from the inner winding layer to the outer winding layer, so that a plurality of winding layers can be formed only in the portion bonded to the rotor.
- the radial stiffness can be increased.
- Figure 7 is a perspective view of the various forms of the flywheel hub made by the manufacturing method according to an embodiment of the present invention
- Figure 8 is a flywheel equipped with a flywheel hub made by a manufacturing method according to an embodiment of the present invention Incision perspective view.
- the flywheel hub 300 according to an embodiment of the present invention may be applied in various forms by combining a single dome or two or more domes as shown in FIG. 7. That is, the hub 300 according to an embodiment of the present invention may be formed in a multistage form of three or more stages by combining a plurality of domes as well as two stages.
- each dome can adjust its rigidity using a variety of composite materials. If the stiff fiber is used, the structural rigidity is good but does not increase well during rotation. If the stiff fiber is used, the structural stiffness is decreased but the length is increased.
- the type of fiber to be used can be determined. In this case, two or more fibers may be mixed and used.
- the hub 300 is assembled between the rotary shaft 100 constituting the flywheel 10 and the rotor 200, and an outer diameter portion having a large diameter is disposed on the inner surface of the rotor 200.
- the inner diameter portion having a small diameter is in contact with the rotating shaft 100.
- the flywheel 10 for storing energy includes a rotor 200, a rotation shaft 100, and a rotor 200 that are wrapped in a state spaced apart from the rotation shaft 100 and the rotation shaft 100. It may be configured to include a hub 300 which is disposed between the interconnection between the rotary shaft 100 and the rotor 200.
- the hub 300 is formed by manufacturing the composite material 301 by the filament winding method as described above.
- the hub 300 is preferably to be assembled to the rotary shaft 100 and the rotor 200 in a press-fit (press-fit). That is, the inner diameter of the hub 300 is formed to be slightly smaller than the diameter of the rotation shaft 100, and the outer diameter of the hub 300 is formed slightly larger than the inner diameter of the rotor 200, the rotation shaft 100 and / or Compress the hub 300 by cooling or press to assemble by interference fit.
- the inner diameter of the hub 300 is formed to be slightly smaller than the diameter of the rotating shaft 100, and assembled by fitting to the inner diameter of the hub 300 in a state in which the rotating shaft 100 is compressed through cooling or pressing. Do it.
- the outer diameter of the hub 300 is formed slightly larger than the inner diameter of the rotor 200, and assembled by fitting to the inner diameter of the rotor 200 in a state in which the hub 300 is compressed through cooling or pressing. Do it.
- the hub 300 is able to continuously connect the rotor 200 and the rotating shaft 100.
- the present invention can be used for energy storage devices and the like.
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- Manufacture Of Motors, Generators (AREA)
Abstract
The present invention relates to a preparation method of a flywheel hub. The preparation method of a flywheel hub which interconnects the rotor of a flywheel and a rotating shaft, comprises: a winding step of winding a composite material into a hollow pressure vessel shape; a curing step of curing the wound composite material; and a cutting step of cutting the composite material wound into a pressure vessel shape into a dome shape. The winding step comprises the following steps: forming a main hallow dome in which an insertion hole for inserting the rotating shaft is formed at one end longitudinally along the rotating shaft, and an aperture is formed at the other end; and winding the composite material on an outer surface of the main dome to form a sub-dome. At least one main dome or sub-dome expands in the radial direction of the rotating shaft by rotation of the rotating shaft and the rotor, and thus it is possible to maintain an adhesive state for the sub-dome and the rotor.
Description
본 발명은 플라이휠용 허브의 제조방법에 관한 것으로, 보다 자세하게는 에너지 저장 능력을 키우기 위해 플라이휠의 로터와 회전축을 연결하는 허브의 강도와 강성을 높이기 위해 복합재료를 다층으로 와인딩하여 플라이휠을 제조하는 플라이휠용 허브의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a flywheel hub, and more specifically, to increase the energy storage capacity of the flywheel to manufacture a flywheel by winding the composite material in multiple layers to increase the strength and rigidity of the hub connecting the rotor and the rotation axis of the flywheel It relates to a method for producing a dragon hub.
전력의 공급과 수요를 정확히 예측하는 것은 어렵기 때문에 효율적인 에너지 관리를 위하여 에너지 저장 장치가 필요하다. Because it is difficult to accurately predict the supply and demand of power, energy storage is needed for efficient energy management.
전력의 공급은 화력 발전, 원자력 발전과 같이 열을 발생시켜 발전하는 방식의 경우는 일정한 적정 출력을 유지하는 것이 가장 경제적이다. 반면에, 수력 발전, 풍력 발전, 태양광 발전과 같이 자연력을 이용하여 발전하는 방식의 경우는 계절과 같은 자연환경에 의해 출력이 좌우되는 반면, 전력의 수요는 낮과 밤, 계절의 변화 등 자연환경의 변화, 대규모 공장의 가동, 송전사고 등 다양한 요소에 의해 변한다.In the case of power generation by generating heat such as thermal power generation and nuclear power generation, it is most economic to maintain a constant output. On the other hand, in the case of power generation using natural power, such as hydroelectric power, wind power, and solar power, the output depends on the natural environment such as the season, while the demand for power is natural such as day, night, and season changes. It is changed by various factors such as changes in the environment, operation of large-scale factories and transmission accidents.
소비와 공급이 동시에 일어나는 전력에너지의 특성상, 전력 설비를 최대수요량에 맞추기 위해서는 많은 비용이 들고, 출력을 수요에 따라 가감하기 위해서는 제어에 필요한 설비와 인력이 필요하다.Due to the nature of power energy, which consumes and supplies at the same time, it is expensive to adjust power equipment to the maximum demand, and equipment and manpower necessary for control are needed to adjust the output according to demand.
상기와 같은 출력 변동 과정에서 발전설비 수명이 단축되고, 수요량과 공급량의 미소한 불일치가 전력의 질적 저하를 가져오는 등 많은 문제가 야기된다. In the output fluctuation process, the lifespan of the power generation equipment is shortened, and a small mismatch between the quantity of supply and the quantity of supply causes a lot of problems.
이러한 문제점을 해결하기 위해서 여러 방식의 전력 저장기술이 개발되었다.In order to solve this problem, various types of power storage technologies have been developed.
종래의 에너지 저장기술로 현재 사용 중이거나 개발 중인 기술로는 양수발전기술, 압축공기 저장 가스터빈 기술, 전지 에너지 저장기술, 초전도 자기 에너지 저장기술, 플라이휠 에너지 저장기술 등이 있다.Conventional energy storage technologies currently in use or under development include pumping power generation technology, compressed air storage gas turbine technology, battery energy storage technology, superconducting magnetic energy storage technology, flywheel energy storage technology, and the like.
이와 같은 기술을 구현하기 위한 시스템 중 플라이휠 에너지 저장 시스템은 잉여의 전력을 이용하여 모터를 회전시킨 후 이때 부착된 회전체의 관성에너지를 저장하고, 필요시 다시 전기에너지로 전환하여 사용하는 장치이다.Flywheel energy storage system of the system for implementing such a technology is a device that uses the surplus power to rotate the motor and then stores the inertial energy of the attached rotor, and if necessary converts to electrical energy again.
이러한 플라이휠 에너지 저장 시스템의 장점으로는 기존의 기계적 에너지 저장 장치와 화학적 에너지 저장 장치에 비해 에너지 저장 효율이 우수하고, 순간적인 충전과 방전이 가능하며 에너지 수명이 길고 저온에서 성능 저하가 없다는 점이다.Advantages of such a flywheel energy storage system include better energy storage efficiency, instant charging and discharging, longer energy life, and no degradation at low temperatures compared to conventional mechanical and chemical energy storage devices.
이러한 시스템의 특징 때문에 현재 전기자동차의 보조동력원, 무정전 전원공급장치, 펄스 파워발생기, 인공위성 등 민간부문에서 군수부문까지 다양한 분야에서 사용되어 왔다.Due to the characteristics of these systems, electric vehicles have been used in various fields from the private sector to the military sector such as auxiliary power sources, uninterruptible power supplies, pulse power generators, and satellites.
상기 플라이휠 에너지 저장 시스템은 회전시 발생하는 관성에너지를 저장하는 플라이휠 로터, 이 플라이휠 로터의 구동을 위한 모터, 전력발생을 위한 발전기, 전원의 입출력을 제어하는 컨트롤러, 주변 부속장치로서 자기베어링 부분과 하우징 부분으로 되어 있다.The flywheel energy storage system includes a flywheel rotor for storing inertial energy generated during rotation, a motor for driving the flywheel rotor, a generator for generating power, a controller for controlling input and output of power, and a magnetic bearing part and a housing as peripheral accessories. It is part.
보다 상세하게는, 상기 플라이휠은 로터와 회전축과 이들을 고정하기 위한 허브로 구성된다.More specifically, the flywheel is composed of a rotor and a rotating shaft and a hub for fixing them.
상기 플라이휠의 회전시 회전축은 반경방향으로 덜 늘어나고 로터는 반경방향으로 많이 늘어나는데, 이를 상기 허브가 연결시켜 주어야 한다. 따라서, 허브는 플라이휠의 회전시 용이하게 팽창이 되어 회전축과 로터를 연결시켜 주며, 회전축의 토크를 로터에 전달하기 위해 변형이 잘 되어야 한다.When the flywheel rotates, the axis of rotation extends less in the radial direction and the rotor increases in the radial direction, which should be connected by the hub. Therefore, the hub is easily inflated when the flywheel rotates to connect the rotating shaft and the rotor, and must be well deformed to transfer the torque of the rotating shaft to the rotor.
또한, 회전시스템 즉 플라이휠의 공진주파수를 작동속도보다 높여 주기 위해 강성이 높아야 한다. 이러한 플라이휠 에너지 저장시스템에 저장할 수 있는 회전 운동에너지는 다음과 같이 표현이 된다.In addition, the rigidity must be high to increase the resonant frequency of the rotary system, ie the flywheel, above the operating speed. The rotational kinetic energy that can be stored in this flywheel energy storage system is expressed as follows.
E=(1/2)Iω2
E = (1/2) Iω 2
상기 수학식에 있는 바와 같이, 플라이휠에 저장되는 에너지는 플라이휠의 극관성 모멘트 I에 선형적으로, 회전속도의 제곱에 비례한다.As in the above equation, the energy stored in the flywheel is linearly proportional to the square of the rotational speed, linear to the pole moment of inertia I of the flywheel.
따라서, 저장에너지를 증가시키기 위해서는 플라이휠의 크기보다는 회전속도의 증가가 매우 효과적임을 알 수 있다.Therefore, in order to increase the storage energy it can be seen that the increase in the rotation speed rather than the size of the flywheel is very effective.
그러나, 종래에 플라이휠의 재료로 사용하던 일반금속은 재료의 인장강도가 약해 고속회전이 불가능하여 플라이휠 에너지 저장시스템의 고속화에 치명적인 약점으로 작용하였다.However, conventional metals, which are conventionally used as a material of a flywheel, have a weak tensile strength of the material, which makes it impossible to rotate at a high speed, thereby acting as a fatal weakness for the speeding up of the flywheel energy storage system.
최근 급격히 발전하고 있는 고강도 복합재료의 개발은 플라이휠의 선주속도를 1110m/sec로 끌어올려 고속회전도 가능하게 하였으며, 플라이휠의 단위 무게 및 단위 부피당 에너지 밀도를 획기적으로 증가시킴으로써 고출력의 에너지 저장시스템의 개발이 가능하게 되었다.In recent years, the development of high strength composite material, which has been rapidly developed, has made it possible to rotate at high speed by raising the flywheel's circumference speed to 1110m / sec, and the development of high power energy storage system by drastically increasing the flywheel's unit weight and energy density per unit volume. This became possible.
특히, 내부 응력 중 강도가 낮은 반지름 방향의 인장응력은 복합재료에 치명적인 손상을 입힐 수 있기 때문에, 복합재료로 된 다층의 링을 조합하여 안쪽의 복합재 링을 반지름 바깥쪽의 복합재 링을 향하여 확장하게 하여 발생하는 응력을 낮추고 있다.Particularly, the radially low tensile stress in the internal stresses can cause fatal damage to the composites, so the combination of multiple layers of composite materials can be combined to extend the inner composite ring towards the outer composite ring. To reduce the stress generated.
그러나, 이러한 로터를 회전축에 연결하기 위해서는 로터와 회전축을 연결하는 허브도 반지름 방향으로 팽창이 잘 되어야 하는 바, 반지름 방향의 팽창이 용이한 허브의 설계가 제시되어야 한다. 즉, 플라이휠에 고속회전하면 허브가 로터에서 분리되는 경향이 나타나므로, 허브와 로터 사이의 접합문제를 반드시 고려하여야 한다.However, in order to connect the rotor to the rotary shaft, the hub connecting the rotor and the rotary shaft should also be well expanded in the radial direction, and therefore, the design of the hub with easy expansion in the radial direction should be presented. That is, when the flywheel rotates at a high speed, the hub tends to be separated from the rotor. Therefore, the bonding problem between the hub and the rotor must be considered.
일반적으로, 플라이휠의 로터 및 허브의 설계시 고려할 사항은 고속 회전시 발생하는 내부 응력을 낮추고 운전 회전수를 회피하는 공진회전수의 설정이다.In general, considerations in the design of the rotor and hub of the flywheel are the setting of the resonance speed to lower the internal stress generated during high speed rotation and to avoid the operating speed.
이를 위하여 그 동안 많은 설계자들에 의해 로터와 회전축을 고정하는 새로운 허브의 설계가 제시되어 왔다.To this end, many designers have proposed the design of a new hub that fixes the rotor and the axis of rotation.
도 1은 종래의 스플릿 돔 타입 허브(Split dome type hub)를 사용하고 있는 플라이휠의 절개 사시도이고, 도 2는 도 1의 허브를 나타내는 절개 사시도이다(공개특허공보 제10-2006-0066765호 참조).1 is a cutaway perspective view of a flywheel using a conventional split dome type hub, and FIG. 2 is a cutaway perspective view of the hub of FIG. 1 (see Publication No. 10-2006-0066765). .
도 1 및 도 2에 도시된 바와 같은 종래의 플라이휠은, 로터(10)의 내주면에 접하는 허브(50)에 다수개의 슬릿(22)을 회전축(30)의 축방향으로 형성하여, 플라이휠이 고속으로 회전할 때 분할된 부분 즉, 슬릿(22)이 원심력에 의해 반경 방향으로 펼쳐져서 허브(50)가 로터(10) 내측면에 압축력을 가하도록 함으로써, 고속회전시 발생하는 로터(10)의 반경방향 인장응력을 감소시키고, 로터(10)와 허브(50)간의 이탈을 방지시킬 수 있다. 또한, 허브(50)가 회전축(30)과 고정되는 부분을 2개 이상으로 하여 플라이휠의 작동속도보다 공진주파수를 높여 공진을 피할 수 있도록 하였다.In the conventional flywheel as shown in FIGS. 1 and 2, a plurality of slits 22 are formed in the axial direction of the rotation shaft 30 in the hub 50, which is in contact with the inner circumferential surface of the rotor 10, so that the flywheel is at high speed. When rotating, the divided portion, that is, the slit 22 is unfolded in the radial direction by the centrifugal force so that the hub 50 exerts a compressive force on the inner surface of the rotor 10, thereby causing the radius of the rotor 10 to be generated at high speed rotation. It is possible to reduce the directional tensile stress and to prevent the separation between the rotor 10 and the hub 50. In addition, the hub 50 has two or more portions fixed to the rotation shaft 30 to increase the resonance frequency than the operating speed of the flywheel so as to avoid resonance.
그러나, 이러한 종래의 스플릿 돔 타입 허브는, 고속회전시 스플릿 날개 즉 슬릿(22)에 의해 분할 형성된 부분이 원심력에 의해 반경방향으로 이동함에 따라 날개의 끝단 즉, 슬릿(22)의 양단에서 응력집중이 생겨 파손되는 문제점이 있으며, 형상이 복잡하여 제작이 어렵고 제작비용 또한 과도하게 발생하는 문제점이 있다.However, such a conventional split dome type hub has a stress concentration at the tip of the blade, i.e., at both ends of the slit 22, as the split blade, i.e., the portion divided by the slit 22, moves radially by the centrifugal force during the high speed rotation. There is a problem that is generated and broken, the shape is complicated and difficult to manufacture, there is also a problem that excessive production costs.
앞서 설명한 바와 같이, 저장 에너지를 증가시키기 위해서는 플라이휠의 고속회전이 가능해야 하는데, 복합재료는 인장응력은 낮추고 강도는 높일 수 있기 때문에 고속회전에 적합한 재료이다. 이 때문에 복합재료를 와인딩하여 형성된 여러 개의 층으로 겹쳐서 만든 로터를 사용하고 있다. As described above, in order to increase the stored energy, the flywheel must be rotated at a high speed, and the composite material is suitable for high speed rotation because the tensile stress can be lowered and the strength can be increased. For this reason, the rotor is made of several layers formed by winding a composite material.
그러나, 다수층의 복합재료로 된 로터는 원주방향으로는 강도가 크지만 반경방향으로는 강도가 약한 단점이 있다. 즉, 고속회전시 와인딩된 복합재료가 반경방향으로 뜯어지는 단점이 있다. 이러한 현상으로 인해 허브와 로터 사이가 벌어지거나 허브가 로터에서 분리 또는 이탈될 수 있다.However, a rotor made of a multi-layered composite material has a disadvantage of high strength in the circumferential direction but weak strength in the radial direction. That is, there is a disadvantage in that the wound composite material is torn in the radial direction at high speed. This may cause the hub to move between the rotor and the hub to be separated or detached from the rotor.
이와 같은 로터와 허브의 분리 현상을 방지하기 위해 허브 역시 반경 방향으로 잘 늘어나야 한다. 그래야 로터와 허브의 분리를 방지할 수 있다.To prevent this separation of the rotor and hub, the hub should also extend well in the radial direction. This will prevent the rotor and hub from separating.
또한, 허브가 반경 방향으로 잘 팽창해야 할 뿐만 아니라 고속회전시에 파손되지 않을 정도의 강도를 가져야 하고, 플라이휠의 공진주파수를 높일 수 있는 구조 또는 형상을 가져야 한다.In addition, the hub should not only expand well in the radial direction, but also have a strength that does not break during high-speed rotation, and should have a structure or shape that can increase the resonant frequency of the flywheel.
본 발명은 복합재료를 다층으로 와인딩하여 돔형상의 허브를 형성함으로써, 금속에 비해 가볍고 높은 강도를 가지며 고속 회전에 따른 팽창이 잘 이루어져 플라이휠의 고속회전시 허브가 응력집중에 의해 파손되는 것을 방지할 수 있으며, 제작이 용이한 플라이휠용 허브의 제조방법을 제공한다.The present invention forms a dome-shaped hub by winding a multi-layered composite material, which is lighter and has higher strength than metal, and expands well according to high-speed rotation, thereby preventing the hub from being damaged by stress concentration during high-speed rotation of the flywheel. And it provides a manufacturing method of the hub for a flywheel easy to manufacture.
본 발명은 플라이휠의 고속 회전시에 로터의 변형을 추종하여 로터와 허브의 밀착상태를 유지할 수 있고 강성을 조절할 수 있는 형상 및 재질로 된 플라이휠용 허브의 제조방법을 제공한다.The present invention provides a method for manufacturing a flywheel hub made of a shape and a material capable of maintaining a close contact between the rotor and the hub and adjusting the rigidity by following the deformation of the rotor during high speed rotation of the flywheel.
상기한 과제를 해결하기 위한 본 발명의 일 실시예에 따른 플라이휠용 허브의 제조방법은, 플라이휠의 로터와 회전축을 상호 연결하는 플라이휠용 허브의 제조방법에 있어서, 복합재료를 와인딩하여 중공의 압력용기 형상으로 형성하는 와인딩 단계; 와인딩된 복합재료를 경화시키는 경화 단계; 및 압력용기 형상으로 와인딩된 복합재료를 돔형상으로 절단하는 커팅 단계;를 포함하며, 상기 와인딩 단계는 상기 회전축의 길이 방향을 따라 일단에는 상기 회전축이 삽입되는 삽입공이 형성되고 타단에는 개구부가 형성되도록 중공 형태의 메인 돔을 형성하는 단계 및 상기 메인 돔을 형성하는 복합재료와 다른 각도로 상기 메인 돔의 외면에 복합재료를 와인딩하여 서브돔을 형성하는 단계를 포함할 수 있다.In the manufacturing method of the flywheel hub according to an embodiment of the present invention for solving the above problems, in the manufacturing method of the flywheel hub connecting the rotor and the rotation axis of the flywheel, the hollow pressure vessel by winding a composite material A winding step of forming a shape; A curing step of curing the wound composite material; And a cutting step of cutting the composite material wound in the shape of a pressure vessel into a dome shape, wherein the winding step includes an insertion hole in which one end of the rotation shaft is inserted along a length direction of the rotation shaft, and an opening is formed at the other end. The method may include forming a hollow main dome and winding a composite material on an outer surface of the main dome at an angle different from that of the composite material forming the main dome to form a subdome.
상기 서브돔을 형성하는 단계는 상기 메인 돔의 외면에 제1서브돔을 와인딩하고 상기 제1서브돔의 외면에 제2서브돔을 와인딩하며, 상기 메인 돔, 상기 제1서브돔 및 상기 제2서브돔은 복합재료를 서로 다른 각도로 와인딩할 수 있다.The forming of the sub dome may include winding a first sub dome on an outer surface of the main dome and a second sub dome on an outer surface of the first sub dome, and the main dome, the first sub dome and the second sub dome. The subdome can wind the composite material at different angles.
성기 서브돔을 형성하는 단계에서 상기 제1서브돔은 상기 메인 돔의 와인딩 각도 보다 작은 각도로 복합재료를 와인딩하고, 상기 제2서브돔은 상기 제1서브돔의 와인딩 각도 보다 작은 각도로 복합재료를 와인딩할 수 있다.In the forming of the genital subdome, the first subdome winds the composite material at an angle smaller than the winding angle of the main dome, and the second subdome is formed at an angle smaller than the winding angle of the first subdome. Can be wound.
상기 서브돔을 형성하는 단계에서 상기 메인 돔은 상기 제1서브돔의 두께 보다 작은 두께를 가지도록 복합재료를 와인딩하고, 상기 제2서브돔의 두께 보다는 큰 두께를 가지도록 복합재료를 와인딩할 수 있다.In the forming of the subdome, the main dome may wind the composite material to have a thickness smaller than the thickness of the first subdome, and may wind the composite material to have a thickness greater than the thickness of the second subdome. have.
상기 서브돔을 형성하는 단계에서 상기 제1서브돔은 상기 메인 돔의 외면에 대하여 상기 제2서브돔의 복합재료 와인딩 시작 위치와 다른 위치에서 복합재료를 와인딩하기 시작할 수 있다.In the forming of the subdome, the first subdome may start winding the composite material at a position different from the starting position of the composite winding of the second subdome with respect to the outer surface of the main dome.
상기 서브돔을 형성하는 단계에서 상기 제1서브돔은 상기 제2서브돔의 복합재료 와인딩 시작 위치 보다 상기 삽입공 가까이에서 복합재료를 와인딩하기 시작할 수 있다.In the forming of the subdome, the first subdome may start winding the composite material closer to the insertion hole than the starting position of the composite winding of the second subdome.
상기 서브돔을 형성하는 단계에서 상기 제1서브돔의 복합재료 와인딩 시작 위치는 상기 메인 돔의 원추부의 외면에 위치할 수 있다.In the forming of the subdome, the composite winding starting position of the first subdome may be located on an outer surface of the conical part of the main dome.
상기 와인딩 단계는 상기 메인 돔은 상기 삽입공 측의 두께가 상기 개구부 측의 두께 보다 크도록 복합재료를 와인딩할 수 있다.In the winding step, the main dome may wind the composite material such that the thickness of the insertion hole side is greater than the thickness of the opening side.
상기 서브돔을 형성하는 단계는 상기 메인 돔의 외면에 대하여 상기 제1서브돔 및 상기 제2서브돔의 복합재료 와인딩 시작위치를 다르게 하여 상기 허브의 반경 방향 강성을 조절할 수 있다.The forming of the sub-dome may control the radial stiffness of the hub by varying the starting position of the composite winding of the first sub dome and the second sub dome with respect to the outer surface of the main dome.
상기 서브돔을 형성하는 단계는 상기 회전축의 길이 방향으로의 복합재료의 와인딩 길이는 상기 메인 돔, 상기 제1서브돔 및 상기 제2서브돔의 순으로 증가하도록 복합재료를 와인딩할 수 있다.The forming of the subdome may include winding the composite material such that the winding length of the composite material in the longitudinal direction of the rotating shaft increases in the order of the main dome, the first subdome and the second subdome.
이상 설명한 바와 같이, 본 발명에 따른 플라이휠용 허브의 제조방법은 복합재료를 다층으로 와인딩하여 돔형상의 허브를 제작함으로써, 제작이 용이하고 회전에 따른 팽창이 잘 이루어지며 금속에 비해 가볍고 높은 강도가 높아 플라이휠의 고속회전시 허브가 응력집중에 의해 파손되는 것을 방지할 수 있다.As described above, the manufacturing method of the flywheel hub according to the present invention by manufacturing a dome-shaped hub by winding the composite material in a multi-layer, it is easy to manufacture, the expansion is achieved by rotation, light and high strength compared to metal When the flywheel rotates at a high speed, the hub may be prevented from being damaged by the concentration of stress.
또한, 본 발명에 따른 플라이휠용 허브의 제조방법은 허브가 회전축에 인접한 곳에서는 잘 늘어나지 않고, 로터에 인접한 곳에서 잘 늘어나기 때문에, 플라이휠의 고속회전시 회전축과 로터를 잘 연결하면서도 동시에 강도가 높고 공진주파수가 높게 되어, 공진현상이 유발되지 않도록 할 수 있다.In addition, the method for manufacturing a flywheel hub according to the present invention does not stretch well in the vicinity of the rotating shaft, but extends well in the vicinity of the rotor. The resonance frequency is high, so that the resonance phenomenon may not be caused.
또한, 본 발명에 따른 플라이휠용 허브의 제조방법은 복합재료를 다층으로 와인딩하여 형성된 허브로 인해 플라이휠의 회전속도에 대응하여 허브의 강성을 조절할 수 있고 돔형상이기 때문에 허브의 내부 또는 하부 공간을 활용할 수 있다.In addition, the manufacturing method of the hub for flywheel according to the present invention can adjust the rigidity of the hub in response to the rotational speed of the flywheel due to the hub formed by winding the composite material in multiple layers and utilize the inner or lower space of the hub Can be.
본 발명에 따른 플라이휠용 허브의 제조방법은 일체로 와인딩한 후 이를 커팅하여 다수개의 허브를 얻기 때문에 다수개의 허브 상호 간의 품질 동일성 또는 균일성을 유지할 수 있다.Since the method for manufacturing a flywheel hub according to the present invention is integrally wound and then cut to obtain a plurality of hubs, it is possible to maintain quality equality or uniformity among the plurality of hubs.
도 1은 종래의 스플릿 돔 타입 허브(Split dome type hub)를 사용하고 있는 플라이휠의 절개 사시도이다.1 is a cutaway perspective view of a flywheel using a conventional split dome type hub.
도 2는 도 1의 허브를 나타내는 절개 사시도이다.FIG. 2 is a cutaway perspective view of the hub of FIG. 1. FIG.
도 3은 본 발명의 일 실시예에 따른 플라이휠용 허브의 제조과정을 도시한 도면이다.Figure 3 is a view showing the manufacturing process of the flywheel hub according to an embodiment of the present invention.
도 4는 본 발명의 일 실시예에 따른 플라이휠용 허브를 제조하는 과정을 나타낸 순서도이다.Figure 4 is a flow chart showing a process for manufacturing a flywheel hub according to an embodiment of the present invention.
도 5는 본 발명의 일 실시예에 따른 플라이휠용 허브의 와인딩 과정을 도시한 도면이다.5 is a view showing a winding process of the flywheel hub according to an embodiment of the present invention.
도 6은 도 5의 (c)에 도시된 플라이휠용 허브의 종방향 부분 단면도이다.FIG. 6 is a longitudinal partial cross-sectional view of the flywheel hub shown in FIG.
도 7은 본 발명의 일 실시예에 따른 제조방법에 의해 만들어진 플라이휠용 허브의 다양한 형태의 절개 사시도이다.Figure 7 is a perspective view of the various forms of the flywheel hub made by the manufacturing method according to an embodiment of the present invention.
도 8은 본 발명의 일 실시예에 따른 제조방법에 의해 만들어진 플라이휠용 허브를 장착한 플라이휠의 절개 사시도이다.8 is a cutaway perspective view of a flywheel equipped with a hub for a flywheel made by a manufacturing method according to an embodiment of the present invention.
이하에서, 본 발명에 따른 실시예들을 첨부된 도면을 참조하여 상세하게 설명한다. 그러나, 본 발명이 실시예들에 의해 제한되거나 한정되는 것은 아니다. 각 도면에 제시된 동일한 참조 부호는 동일한 부재를 나타낸다. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. Like reference numerals in the drawings denote like elements.
도 3은 본 발명의 일 실시예에 따른 플라이휠용 허브의 제조과정을 도시한 도면, 도 4는 본 발명의 일 실시예에 따른 플라이휠용 허브를 제조하는 과정을 나타낸 순서도이다.Figure 3 is a view showing the manufacturing process of the flywheel hub according to an embodiment of the present invention, Figure 4 is a flow chart showing a process for manufacturing a flywheel hub according to an embodiment of the present invention.
본 발명의 일 실시예에 따른 플라이휠용 허브(300)는 플라이휠의 로터와 회전축을 상호 연결하는 것으로써, 필라멘트 와인딩 방법(Filament Winding Method)에 의해 제작된다. Flywheel hub 300 according to an embodiment of the present invention by connecting the rotor and the rotation axis of the flywheel, is manufactured by the filament winding method (Filament Winding Method).
도 3 및 도 4에 도시된 바와 같이, 본 발명의 일 실시예에 따른 플라이휠용 허브(300)는 복합재료를 와인딩하는 단계(1100~1300), 와인딩된 복합재료를 경화시키는 단계(1400) 및 경화된 형상을 커팅(cutting)하는 단계(1500)를 포함한 제조방법에 의해 얻어질 수 있다.As shown in Figure 3 and 4, the flywheel hub 300 according to an embodiment of the present invention comprises the steps of winding the composite material (1100 ~ 1300), curing the wound composite material (1400) and It can be obtained by a manufacturing method including the step 1500 of cutting the cured shape.
복합재료를 와인딩하는 단계(1100~1300)는, 도 3(a)에 도시된 바와 같이 복합재료(301)를 필라멘트 와인딩 방법으로 와인딩하여 중공의 압력용기 형상으로 형성하는 단계이다.Winding the composite material (1100 ~ 1300), as shown in Figure 3 (a) is a step of winding the composite material 301 by the filament winding method to form a hollow pressure vessel shape.
복합재료(301)는 탄소섬유, 유리섬유 또는 탄소섬유와 유리섬유의 혼합섬유와 같은 보강섬유재에 에폭시 등의 열경화성 수지를 도포한 재료이다.The composite material 301 is a material obtained by applying a thermosetting resin such as epoxy to a reinforcing fiber material such as carbon fiber, glass fiber or mixed fiber of carbon fiber and glass fiber.
상기한 바와 같은 복합재료(301)은 탄소섬유, 유리섬유 이외에 다양한 종류의 섬유를 사용할 수 있고, 필요에 따라 다른 종류의 섬유를 섞어 사용할 수도 있다.As described above, the composite material 301 may use various kinds of fibers in addition to carbon fibers and glass fibers, and may mix and use different kinds of fibers as necessary.
필라멘트 와인딩 방법은 보강섬유재의 표면에 포함된 공기와 열경화성 수지와의 치환을 행하여 보강섬유재에 수지를 함침하면서 소정의 권취 각도로 보강섬유재를 연속적으로 맨드렐(Mandrel)에 권취하는 방법이다.The filament winding method is a method of winding the reinforcing fiber material in a mandrel continuously at a predetermined winding angle while impregnating the resin in the reinforcing fiber material by performing the substitution of air contained in the surface of the reinforcing fiber material and the thermosetting resin.
이러한 필라멘트 와인딩 방법은 수지의 함침방식에 따라 디핑(Dipping)방식과 드럼방식으로 구분된다. 디핑방식은 수지액을 채운 함침조 내에서 보강섬유재에 수지를 함침하는 방식이고, 드럼방식은 회전하는 드럼상에서 보강섬유재에 수지를 함침하는 방식이다.The filament winding method is divided into a dipping method and a drum method according to the impregnation method of the resin. The dipping method is a method of impregnating the resin in the reinforcing fiber material in the impregnation tank filled with the resin liquid, the drum method is a method of impregnating the resin in the reinforcing fiber material on the rotating drum.
그리고, 필라멘트 와인딩 방법은 권취방식에 따라 후프방식과 헬리컬 방식으로 구분된다. 후프방식은 필라멘트 즉 복합재료(301)가 맨드렐과 거의 수직으로 감기도록 하는 방식이고, 헬리컬방식은 복합재료(301)가 맨드렐의 회전축(100)과 큰 각을 이루면서 감겨지는 방식이다.The filament winding method is divided into a hoop method and a helical method according to a winding method. The hoop method is a method in which the filament, that is, the composite material 301 is wound substantially perpendicular to the mandrel, and the helical method is a method in which the composite material 301 is wound while forming a large angle with the rotation axis 100 of the mandrel.
와인딩하는 단계(1100~1300)에서는 양단이 돔형상으로 형성할 수 있도록 헬리컬방식으로 복합재료(301)를 와인딩한다. 물론 필요에 따라 와인딩하는 단계(1100~1300)에서는 복합재료(301)를 후프방식으로 와인딩할 수도 있다.In the winding steps 1100-1300, the composite material 301 is wound in a helical manner so that both ends can be formed in a dome shape. Of course, in the winding steps 1100 to 1300 as necessary, the composite material 301 may be wound in a hoop manner.
이러한 필라멘트 와인딩 방법은 다른 복합재료 가공법에 비하여 사용되는 재료의 가격이 저렴하고, 인건비가 적게 들며, 컴퓨터 제어나 로봇 등을 사용하면 생산공정의 균일성을 이룩할 수 있기 때문에 제품의 복제성에 좋다는 이점이 있다. 이러한 상기 필라멘트 와인딩 방법은 복합재 압력용기를 제작하는데 주로 사용된다.This filament winding method has the advantages of low cost, low labor cost, and uniformity of production process using computer control or robot, compared to other composite materials processing methods. have. This filament winding method is mainly used to fabricate composite pressure vessels.
와인딩하는 단계(1100~1300)를 마친 상태는 도 3(b)에 도시되어 있다. 와인딩하는 단계(1100~1300)에서는 필요에 따라 복합재료(301)를 각 구간별로 그 두께를 서로 다르게 감을 수 있다.The completion of the winding steps 1100-1300 is illustrated in FIG. 3 (b). In the winding steps 1100 to 1300, the thickness of the composite material 301 may be differently wound for each section as needed.
한편, 제작하고자 하는 허브(300)의 돔형상이 결정되면 복합재료(301)의 권취각도가 결정되고, 복합재료(301)의 권취각도가 결정되면 제작될 허브(300)의 강성, 강도, 변형률 등이 결정될 수 있다. 이러한 것은 유한요소해석 또는 구조해석을 통해 결정할 수 있다.Meanwhile, when the dome shape of the hub 300 to be manufactured is determined, the winding angle of the composite material 301 is determined. When the winding angle of the composite material 301 is determined, the rigidity, strength, strain, etc. of the hub 300 to be manufactured are determined. This can be determined. This can be determined through finite element analysis or structural analysis.
한편, 경화시키는 단계(1400)는 상기 맨드렐에 와인딩된 복합재료(301)를 경화시키는 단계이다. 커팅하는 단계(1500)는 도 3(b)에 도시된 바와 같이 압력용기 형상으로 와인딩된 복합재료(301)의 양단을 도 3(c)에 도시된 바와 같이 돔 형상으로 절단하는 단계이다. 도 3(c)에 도시된 바와 같이, 본 발명의 일 실시예에 따른 허브(300)는 동일한 필라멘트 와인딩 공법에 의해 제조된 압력 용기 형상의 부품을 대칭적으로 커팅하여 얻어지는 2개의 돔형상 허브(300)를 모두 사용할 수 있고, 이러한 2개의 돔형상 허브(300)는 부품 간의 균일성이 유지될 수 있다. 따라서, 커팅하여 얻어진 돔형상 허브(300)를 플라이휠에 사용하는 경우에 고속회전하더라도 어느 하나의 허브(300)의 치수가 이상하거나 먼저 파손되는 현상 등을 방지할 수 있다.Meanwhile, the curing step 1400 is a step of curing the composite material 301 wound on the mandrel. The cutting step 1500 is a step of cutting both ends of the composite material 301 wound in the shape of a pressure vessel as shown in FIG. 3 (b) into a dome shape as shown in FIG. 3 (c). As shown in Figure 3 (c), the hub 300 according to an embodiment of the present invention is the two dome-shaped hubs obtained by symmetrically cutting the parts of the pressure vessel shape manufactured by the same filament winding method ( 300 may be used, and the two domed hubs 300 may maintain uniformity between components. Therefore, even when the dome-shaped hub 300 obtained by cutting is used for the flywheel, it is possible to prevent a phenomenon in which any one of the hubs 300 is abnormal in size or breaks first even when rotating at a high speed.
상기와 같은 커팅 단계(1500)에 의해 얻어진 허브(300)는 외측면이 일방향으로 볼록하게 돌출되고, 내측면이 일방향으로 오목하게 함몰된 돔(dome)형상으로 형성되며, 복합재료(301)가 와인딩되어 형성된다.The hub 300 obtained by the cutting step 1500 as described above is formed in a dome shape in which the outer surface is convexly protruded in one direction, and the inner surface is concave in one direction, and the composite material 301 is formed. It is formed by winding.
위와 같이 허브(300)를 돔 형상으로 형성함으로써, 상하방향의 유동을 방지할 수 있고 반지름 방향의 강성을 높일 수 있으며, 반지름 방향으로 쉽게 팽창할 수 있다.By forming the hub 300 in the shape of a dome as above, it is possible to prevent the flow in the vertical direction and to increase the rigidity in the radial direction, it can be easily expanded in the radial direction.
또한, 허브(300)를 상술한 복합재료의 필라멘트 와인딩 방법을 통해 제작함으로써, 그 제작이 매우 용이하고, 복합재료로 제작되기 때문에 팽창률이 우수하며 동시에 강성이 높아 공진주파수를 높게 할 수 있다. 필요에 따라 돔 형상의 상기 허브(300)는 외경과 내경을 추가 가공 혹은 연마할 수 있다.In addition, by manufacturing the hub 300 through the filament winding method of the composite material described above, the fabrication of the hub 300 is very easy, and because the composite is made of a composite material, the expansion rate is excellent and the rigidity is high, thereby increasing the resonance frequency. If necessary, the dome-shaped hub 300 may further process or polish an outer diameter and an inner diameter.
이하에서는 도면을 참조하여 본 발명의 일 실시예에 따른 플라이휠용 허브(300)의 제조방법에 대해서 보다 자세히 살펴 본다. Hereinafter, a method of manufacturing the flywheel hub 300 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
도 5는 본 발명의 일 실시예에 따른 플라이휠용 허브의 와인딩 과정을 도시한 도면, 도 6은 도 5의 (c)에 도시된 플라이휠용 허브의 종방향 부분 단면도이다.FIG. 5 is a view illustrating a winding process of a flywheel hub according to an embodiment of the present invention, and FIG. 6 is a longitudinal cross-sectional view of the flywheel hub shown in FIG. 5C.
도 3 [4] 내지 도 6을 참조하면, 본 발명의 일 실시예에 따른 허브(300)의 제조방법 중 와인딩하는 단계(1100~1300)는 회전축의 길이 방향을 따라 일단에는 회전축이 삽입되는 삽입공(302)이 형성되고 타단에는 개구부(303)가 형성되도록 중공 형태의 메인 돔(300a)을 형성하는 단계(1100) 및 메인 돔(main dome, 300a)의 외면에 복합재료(301)를 와인딩하여 서브돔(sub dome, 300b,300c)을 형성하는 단계(1200,1300)를 포함할 수 있다. 3 [4] to 6, the winding step (1100 ~ 1300) of the manufacturing method of the hub 300 according to an embodiment of the present invention is inserted into the rotary shaft at one end along the longitudinal direction of the rotary shaft Forming a hollow main dome 300a to form a hole 302 and an opening 303 at the other end 1100 and winding the composite material 301 on the outer surface of the main dome 300a. And forming the sub domes 300b and 300c (1200 and 1300).
상기한 바와 같은 제조방법에 의해, 본 발명의 일 실시예에 따른 플라이휠용 허브(300)는 회전축의 길이 방향을 따라 일단에는 회전축이 삽입되는 삽입공(302)이 형성되고 타단에는 개구부(303)가 형성되며 복합재료(301)가 와인딩되어 형성되는 중공 형태의 메인 돔(main dome, 300a) 및 로터와 접착되며 메인 돔(300a)의 외면에 복합재료(301)를 와인딩하여 형성되는 서브돔(sub dome, 300b,300c)을 포함할 수 있다. 메인 돔(300a) 또는 서브돔(300b,300c) 중 적어도 하나는 상기 회전축 및 상기 로터가 고속으로 회전함에 따라 상기 회전축의 반경 방향으로 팽창할 수 있기 때문에 허브(300) 내지 서브돔(300b,300c)과 상기 로터의 접착 상태를 유지할 수 있다.By the manufacturing method as described above, the flywheel hub 300 according to an embodiment of the present invention is formed with an insertion hole 302 is inserted into the rotary shaft at one end in the longitudinal direction of the rotary shaft and the opening 303 at the other end And a sub dome formed by winding the composite material 301 on the outer surface of the main dome 300a and the rotor having a hollow shape formed by winding the composite material 301. sub dome, 300b, 300c). At least one of the main dome 300a or the subdome 300b, 300c may be the hub 300 to the subdome 300b, 300c because the rotating shaft and the rotor may expand in the radial direction of the rotating shaft as the rotor rotates at a high speed. ) And the rotor can be maintained.
여기서, 허브(300)와 상기 로터의 접착성을 높이기 위해서 허브(300)는 로터와 동일하거나 유사한 성분의 복합재료로 와인딩되는 것이 바람직하다.Here, in order to increase the adhesion between the hub 300 and the rotor, the hub 300 is preferably wound with a composite material having the same or similar components as the rotor.
한편, 서브돔(300b,300c)은 메인 돔(300a)의 외면에 와인딩되는 제1서브돔(300b) 및 제1서브돔(300b)의 외면에 와인딩되는 제2서브돔(300c)을 포함할 수 있다. 즉, 서브돔(300b,300c)은 적어도 2개의 복합재료 와인딩 층을 포함할 수 있다. 도 5 및 도 6에는 서브돔(300b,300c)이 2개의 와인딩 층을 포함하는 허브(300)가 도시되어 있으나, 반드시 이에 국한되는 것은 아니며 필요한 강성 등 설계 요구사항에 따라 서브돔은 다수개의 와인딩 층으로 이루어질 수도 있다.On the other hand, the sub dome (300b, 300c) may include a first subdome (300b) is wound on the outer surface of the main dome (300a) and a second subdome (300c) is wound on the outer surface of the first subdome (300b) Can be. That is, the subdomes 300b and 300c may include at least two composite winding layers. 5 and 6 illustrate a hub 300 in which the subdomes 300b and 300c include two winding layers, but the present invention is not limited thereto, and the subdome may have a plurality of windings according to design requirements such as necessary rigidity. It may be made of layers.
여기서, 메인 돔(300a), 제1서브돔(300b) 및 제2서브돔(300c)은 서로 다른 와인딩 각도를 가질 수 있다.Here, the main dome 300a, the first sub dome 300b and the second sub dome 300c may have different winding angles.
이를 위해, 서브돔(300b,300c)을 형성하는 단계는(1200,1300)는 메인 돔(300a)의 외면에 제1서브돔(300b)을 와인딩하는 단계(1200) 및 제1서브돔(300b)의 외면에 제2서브돔(300c)을 와인딩하는 단계(1300)를 포함하며, 메인 돔(300a), 제1서브돔(300b) 및 제2서브돔(300c)은 복합재료를 서로 다른 각도로 와인딩하여 형성될 수 있다. 도 5에 도시된 바와 같이, 메인 돔(300a)의 복합재료를 와인딩하는 각도(θ1), 제1서브돔(300b)의 복합재료를 와인딩하는 각도(θ2), 제2서브돔(300c)의 복합재료를 와인딩하는 각도(θ3)는 서로 다르다. 이와 같이, 허브(300)를 구성하는 메인 돔(300a), 제1서브돔(300b) 및 제2서브돔(300c)의 복합재료 와인딩 각도를 다르게 함으로써 허브(300)의 강성을 높일 수 있고, 메인 돔(300a), 제1서브돔(300b) 및 제2서브돔(300c) 각각에 대해서 반경 방향 팽창 정도를 다르게 할 수 있다. 이로 인해, 플라이휠의 고속회전시 로터의 반경 방향 변형을 추종하여 허브(300) 역시 반경 방향으로 잘 팽창하거나 변형할 수 있고 로터와 허브(300)의 접착 상태를 견고하게 유지할 수 있다.To this end, forming the sub dome (300b, 300c) (1200, 1300) is the step of winding the first sub dome (300b) on the outer surface of the main dome (300a) (1200) and the first sub dome (300b) Winding the second sub-dome 300c on the outer surface of the step 1300, and the main dome 300a, the first sub-dome 300b and the second sub-dome 300c have different angles of the composite material. It can be formed by winding. As shown in FIG. 5, the angle θ1 of winding the composite material of the main dome 300a, the angle θ2 of winding the composite material of the first subdome 300b, and the second subdome 300c of the second dome 300c. The angles θ3 for winding the composite material are different from each other. As such, the rigidity of the hub 300 may be increased by changing the composite winding angles of the main dome 300a, the first sub dome 300b, and the second sub dome 300c constituting the hub 300. The degree of radial expansion may be different for each of the main dome 300a, the first subdome 300b, and the second subdome 300c. Because of this, by following the radial deformation of the rotor when the flywheel rotates at high speed, the hub 300 may also be well inflated or deformed in the radial direction, and the adhesion between the rotor and the hub 300 may be maintained firmly.
서브돔(300b,300c)을 형성하는 단계(1200,1300)에서 제1서브돔(300b)은 메인 돔(300a)의 와인딩 각도 보다 작은 각도로 복합재료를 와인딩하고, 제2서브돔(300c)은 제1서브돔(300b)의 와인딩 각도 보다 작은 각도로 복합재료를 와인딩할 수 있다.In steps 1200 and 1300 of forming the sub domes 300b and 300c, the first sub dome 300b winds the composite material at an angle smaller than the winding angle of the main dome 300a, and the second sub dome 300c. May wind the composite material at an angle smaller than the winding angle of the first subdome 300b.
다시 말하면, 제1서브돔(300b)의 와인딩 각도(θ2)는 메인 돔(300a)의 와인딩 각도(θ1) 보다 작고, 제2서브돔(300c)의 와인딩 각도(θ3)는 제1서브돔(300b)의 와인딩 각도(θ2) 보다 작게 형성될 수 있다. 이와 같이, 나중에 와인딩되는 복합재료의 와인딩 각도를 이전에 와인딩된 복합재료의 와인딩 각도 보다 작게 함으로써, 이전에 와인딩된 복합재료가 고속회전에 의해 풀리거나 반경 방향으로 뜯어지는 것을 방지할 수 있고 강성을 더욱 높일 수 있다.In other words, the winding angle θ2 of the first subdome 300b is smaller than the winding angle θ1 of the main dome 300a, and the winding angle θ3 of the second subdome 300c is the first subdome ( It may be formed smaller than the winding angle θ2 of 300b). As such, by making the winding angle of the later-winding composite material smaller than the winding angle of the previously-winding composite material, it is possible to prevent the previously wound composite material from being loosened or torn in a radial direction by high-speed rotation and having rigidity. It can be increased further.
서브돔(300b,300c)을 형성하는 단계(1200,1300)에서 메인 돔(300a)은 제1서브돔(300b)의 두께 보다 작은 두께를 가지도록 복합재료를 와인딩하고, 제2서브돔(300c)의 두께 보다는 큰 두께를 가지도록 복합재료를 와인딩할 수 있다.In steps 1200 and 1300 of forming the sub domes 300b and 300c, the main dome 300a winds the composite material to have a thickness smaller than that of the first subdome 300b and the second subdome 300c. The composite material can be wound to have a thickness greater than the thickness of).
메인 돔(300a)의 복합재료 와인딩 두께는 제1서브돔(300b)의 복합재료 와인딩 두께 보다 작고 제2서브돔(300c)의 복합재료 와인딩 두께 보다 크게 형성함으로써, 내측 와인딩(300a) 및 외측 와인딩(300c) 보다 중간 와인딩(300b)의 두께를 두껍게 와인딩함으로써 고속회전시 내측의 와인딩이 반경 방향으로 더 많이 팽창하여 외측 와인딩을 로터 쪽으로 밀어 주기 때문에 허브(300)가 로터에서 이탈하는 것을 방지할 수 있다.The composite winding thickness of the main dome 300a is smaller than the composite winding thickness of the first subdome 300b and larger than the composite winding thickness of the second subdome 300c, thereby forming the inner winding 300a and the outer winding. By winding the thickness of the intermediate winding 300b thicker than the 300c, the hub 300 can be prevented from escaping from the rotor because the inner winding expands more radially and pushes the outer winding toward the rotor during high-speed rotation. have.
서브돔(300b,300c)을 형성하는 단계(1200,1300)에서 제1서브돔(300b)은 메인 돔(300a)의 외면에 대하여 제2서브돔(300c)의 복합재료 와인딩 시작 위치와 다른 위치에서 복합재료를 와인딩하기 시작할 수 있다.In steps 1200 and 1300 of forming the sub-domes 300b and 300c, the first sub-dome 300b is different from the starting position of the composite winding of the second sub-dome 300c with respect to the outer surface of the main dome 300a. You can start winding the composite at.
허브(300)를 구성하는 메인 돔(300a), 제1서브돔(300b) 및 제2서브돔(300c)은 각각 복합재료를 와인딩하기 시작하는 위치가 다르게 형성될 수 있다. 즉, 메인 돔(300a)의 외면에 대하여 제1서브돔(300b)은 제2서브돔(300c)의 복합재료 와인딩 시작 위치와 다른 와인딩 시작 위치를 가질 수 있다. The main dome 300a, the first subdome 300b, and the second subdome 300c constituting the hub 300 may be formed to have different positions at which the composite material starts winding. That is, the first sub dome 300b may have a winding start position different from the composite winding start position of the second sub dome 300c with respect to the outer surface of the main dome 300a.
서브돔(300b,300c)을 형성하는 단계(1200,1300)는 메인 돔(300a)의 외면에 대하여 제1서브돔(300b) 및 제2서브돔(300c)의 복합재료 와인딩 시작위치를 다르게 하여 허브(300)의 반경 방향 강성을 조절할 수 있다. Steps 1200 and 1300 of forming the sub-domes 300b and 300c may be performed by varying the starting positions of the composite windings of the first sub dome 300b and the second sub dome 300c with respect to the outer surface of the main dome 300a. The radial stiffness of the hub 300 can be adjusted.
도 5를 참조하면, 메인 돔(300a)은 복합재료를 맨드렐(mandrel) 전체에 걸쳐서 와인딩하는 반면에 제1서브돔(300b)은 메인 돔(300a)의 원통형 부분과 원통형 부분 양단의 원추형 부분에 조금 걸치도록 와인딩됨을 알 수 있다. 또한, 제2서브돔(300c)은 제1서브돔(300b)의 원통형 부분에만 와인딩된다. 따라서, 허브(300)의 원통형 부분에는 3개의 와인딩 층이 형성되는 반면 원통형 부분의 양단에는 2개 또는 1개의 와인딩 층만 형성된다. 이와 같이, 복합재료가 중첩적으로 와인딩되는 부분이 다르도록 복합재료의 와인딩 시작 위치를 다르게 함으로써 허브(300)가 필요로 하는 강성을 조절할 수 있다. 이 때, 와인딩 시작 위치의 결정은 구조 해석 등을 통해 설계 단계에서 결정할 수 있다.Referring to FIG. 5, the main dome 300a winds the composite material over the entire mandrel, while the first subdome 300b has a cylindrical portion and a conical portion at both ends of the cylindrical portion of the main dome 300a. You can see that it winds up a bit. In addition, the second subdome 300c is wound only on the cylindrical portion of the first subdome 300b. Thus, three winding layers are formed on the cylindrical portion of the hub 300 while only two or one winding layer is formed on both ends of the cylindrical portion. As such, the stiffness required by the hub 300 may be adjusted by changing the winding start position of the composite material such that the portions where the composite material is overlapped are differently wound. At this time, the determination of the starting position of the winding can be determined at the design stage through structural analysis.
또한, 서브돔(300b,300c)을 형성하는 단계(1200,1300)에서 제1서브돔(300b)은 제2서브돔(300c)의 복합재료 와인딩 시작 위치 보다 삽입공(302) 가까이에서 복합재료를 와인딩하기 시작할 수 있고, 제1서브돔(300b)의 복합재료 와인딩 시작 위치는 메인 돔(300a)의 원추부의 외면에 위치할 수 있다.In addition, in the forming of the sub-dome (300b, 300c) (1200, 1300), the first sub-dome (300b) is closer to the insertion hole 302 than the composite winding start position of the second sub-dome (300c) May start winding, and the composite winding starting position of the first sub dome 300b may be located on an outer surface of the cone portion of the main dome 300a.
도 6에 도시된 바와 같이, 제1서브돔(300b)의 복합재료 와인딩 시작 위치(A)는 제2서브돔(300c)의 복합재료 와인딩 시작 위치 보다 허브(300)의 삽입공(302) 쪽에 가까이 형성될 수 있고, 제1서브돔(300b)의 복합재료 와인딩 시작 위치(A)는 메인 돔(300a)의 원추형 부분의 외면에 위치할 수 있다.As shown in FIG. 6, the composite winding start position A of the first subdome 300b is closer to the insertion hole 302 of the hub 300 than the composite winding start position of the second subdome 300c. It may be formed close, the composite winding start position (A) of the first sub dome (300b) may be located on the outer surface of the conical portion of the main dome (300a).
허브(300)를 커팅하는 절단선(CL)을 기준으로 볼 때 허브(300)의 개구부(303) 측이 다수개의 층으로 와인딩됨을 알 수 있는데, 고속회전시 반경 방향으로 팽창되는 부분에 다수 층의 복합재료 와인딩을 형성하는 것이 바람직하다.On the basis of the cutting line CL cutting the hub 300, it can be seen that the opening 303 side of the hub 300 is wound in a plurality of layers. It is desirable to form a composite winding of.
와인딩 단계(1100~1300)는 메인 돔(300a)은 삽입공(302) 측의 두께가 개구부(303) 측의 두께 보다 크도록 복합재료를 와인딩할 수 있다.In the winding steps 1100 to 1300, the main dome 300a may wind the composite material such that the thickness of the insertion hole 302 is greater than the thickness of the opening 303.
메인 돔(300a)은 삽입공(302) 측의 와인딩 두께(B)가 개구부(303) 측의 와인딩 두께(C) 보다 크게 형성될 수 있다. 삽입공(302) 측의 와인딩(B)은 고속회전시에도 회전축과 허브(300)의 접착 상태를 유지할 수 있어야 하는데, 이를 위해 고속회전하더라도 허브(300)가 팽창하지 않도록 두껍게 와인딩하는 것이 바람직하다. 이에 반해 허브(300)의 개구부(303) 측 와인딩은 고속회전시 쉽게 팽창할 수 있도록 상대적으로 얇은 두께를 가지도록 와인딩하는 것이 바람직하다.The main dome 300a may have a winding thickness B at the insertion hole 302 greater than a winding thickness C at the opening 303 side. Winding (B) of the insertion hole 302 side should be able to maintain the adhesive state of the rotating shaft and the hub 300 even at high speed rotation, for this purpose it is preferable to winding thick so that the hub 300 does not expand even at high speed rotation. . On the other hand, the winding of the opening 303 side of the hub 300 is preferably wound to have a relatively thin thickness so that it can easily expand during high-speed rotation.
한편, 서브돔(300b,300c)을 형성하는 단계(1200,1300)는 회전축의 길이 방향으로의 복합재료의 와인딩 길이는 메인 돔(300a), 제1서브돔(300b) 및 제2서브돔(300c)의 순으로 증가하도록 복합재료를 와인딩할 수 있다. On the other hand, forming the sub dome (300b, 300c) (1200, 1300) is the winding length of the composite material in the longitudinal direction of the rotation axis is the main dome (300a), the first subdome (300b) and the second subdome ( The composite material can be wound up in order of 300c).
도 6에 도시된 바와 같이, 회전축의 길이 방향을 따라 메인 돔(300a)의 와인딩 길이가 가장 길며, 제1서브돔(300b)의 와인딩 길이가 그 다음, 그리고 제2서브돔(300c)의 와인딩 길이가 가장 작다. 이와 같이, 내측 와인딩 층에서 외측 와인딩 층으로 갈수록 회전축의 길이 방향에 대해서 와인딩의 길이가 점차 짧아지도록 와인딩함으로써, 로터와 접착되는 부분에 한하여 다수의 와인딩 층이 형성되게 할 수 있고, 이 부분에서의 반경 방향 강성을 크게 할 수 있다.As shown in FIG. 6, the winding length of the main dome 300a is the longest along the longitudinal direction of the rotation axis, the winding length of the first subdome 300b is next, and the winding of the second subdome 300c. The smallest length As such, the windings are gradually shortened with respect to the longitudinal direction of the rotation axis from the inner winding layer to the outer winding layer, so that a plurality of winding layers can be formed only in the portion bonded to the rotor. The radial stiffness can be increased.
이하에서는 도면을 참조하여 상기한 제조방법에 의해 구현된 플라이휠용 허브 및 이를 구비한 에너지 저장용 플라이휠에 대해서 설명한다.Hereinafter, a flywheel hub implemented by the above-described manufacturing method and an energy storage flywheel having the same will be described with reference to the accompanying drawings.
이하에서는 도면을 참조하여, 본 발명의 일 실시예에 따른 허브의 다양한 형태에 대해서 자세히 살펴 본다.Hereinafter, various forms of the hub according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
도 7은 본 발명의 일 실시예에 따른 제조방법에 의해 만들어진 플라이휠용 허브의 다양한 형태의 절개 사시도, 도 8은 본 발명의 일 실시예에 따른 제조방법에 의해 만들어진 플라이휠용 허브를 장착한 플라이휠의 절개 사시도이다.Figure 7 is a perspective view of the various forms of the flywheel hub made by the manufacturing method according to an embodiment of the present invention, Figure 8 is a flywheel equipped with a flywheel hub made by a manufacturing method according to an embodiment of the present invention Incision perspective view.
본 발명의 일 실시예에 따른 플라이휠용 허브(300)는 도 7에 도시된 바와 같이 단일 돔 또는 2개 이상의 돔이 결합되어 다양한 형태로 응용이 가능하다. 즉, 본 발명의 일 실시예에 따른 허브(300)는 2단뿐만 아니라 다수개의 돔을 상호 결합시켜 3단 이상의 다단형태로 형성될 수도 있다.The flywheel hub 300 according to an embodiment of the present invention may be applied in various forms by combining a single dome or two or more domes as shown in FIG. 7. That is, the hub 300 according to an embodiment of the present invention may be formed in a multistage form of three or more stages by combining a plurality of domes as well as two stages.
또한, 각각의 돔은 다양한 복합재료 소재를 사용하여 강성을 조절할 수 있다. 강성이 큰 섬유를 사용하게 되면 구조적인 강성은 좋아지지만 회전시 잘 늘어나지 않고, 강성이 작은 섬유를 사용하게 되면 구조적인 강성은 떨어지지만 잘 늘어나기 때문에, 이를 이용하여 각각의 돔 타입 복합재 허브(300)에 사용될 섬유의 종류를 결정할 수 있다. 이때, 두 가지 이상의 섬유를 혼합하여 사용할 수도 있다.In addition, each dome can adjust its rigidity using a variety of composite materials. If the stiff fiber is used, the structural rigidity is good but does not increase well during rotation. If the stiff fiber is used, the structural stiffness is decreased but the length is increased. The type of fiber to be used can be determined. In this case, two or more fibers may be mixed and used.
이러한 허브(300)는 도 8에 도시된 바와 같이, 상기 플라이휠(10)을 이루는 회전축(100)과 로터(200) 사이에 조립이 되는데, 직경이 큰 외직경부는 로터(200)의 내측면에 접하게 되고, 직경이 작은 내직경부는 회전축(100)을 감싸면서 접하게 된다.As shown in FIG. 8, the hub 300 is assembled between the rotary shaft 100 constituting the flywheel 10 and the rotor 200, and an outer diameter portion having a large diameter is disposed on the inner surface of the rotor 200. The inner diameter portion having a small diameter is in contact with the rotating shaft 100.
즉, 본 발명의 일 실시예에 따른 에너지 저장용 플라이휠(10)은 회전축(100), 회전축(100)을 중심으로 이격된 상태로 감싸고 있는 로터(200), 회전축(100)과 로터(200) 사이에 배치되어 회전축(100)과 로터(200)를 상호 연결하는 허브(300)를 포함하여 구성될 수 있다. That is, the flywheel 10 for storing energy according to the embodiment of the present invention includes a rotor 200, a rotation shaft 100, and a rotor 200 that are wrapped in a state spaced apart from the rotation shaft 100 and the rotation shaft 100. It may be configured to include a hub 300 which is disposed between the interconnection between the rotary shaft 100 and the rotor 200.
허브(300)는 상술한 바와 같이 복합재료(301)를 필라멘트 와인딩 방법으로 제작하여 형성된다. 이러한 허브(300)는 회전축(100)과 로터(200)에 억지끼워맞춤(press-fit)으로 조립하도록 함이 바람직하다. 즉, 허브(300)의 내직경을 회전축(100)의 지름보다 약간 작게 형성하고, 허브(300)의 외직경을 로터(200)의 내직경보다 약간 크게 형성하여, 회전축(100) 및/또는 허브(300)를 냉각 혹은 프레스로 압축시켜 억지끼워맞춤으로 조립하도록 한다.The hub 300 is formed by manufacturing the composite material 301 by the filament winding method as described above. The hub 300 is preferably to be assembled to the rotary shaft 100 and the rotor 200 in a press-fit (press-fit). That is, the inner diameter of the hub 300 is formed to be slightly smaller than the diameter of the rotation shaft 100, and the outer diameter of the hub 300 is formed slightly larger than the inner diameter of the rotor 200, the rotation shaft 100 and / or Compress the hub 300 by cooling or press to assemble by interference fit.
다시 말해, 허브(300)의 내직경을 회전축(100)의 지름보다 약간 작게 형성하여, 회전축(100)을 냉각 또는 프레스를 통해 압축시킨 상태로 허브(300)의 내직경에 억지끼워맞춤으로 조립을 한다.In other words, the inner diameter of the hub 300 is formed to be slightly smaller than the diameter of the rotating shaft 100, and assembled by fitting to the inner diameter of the hub 300 in a state in which the rotating shaft 100 is compressed through cooling or pressing. Do it.
그리고, 허브(300)의 외직경을 로터(200)의 내직경보다 약간 크게 형성하여, 허브(300)를 냉각 또는 프레스를 통해 압축시킨 상태로 로터(200)의 내직경에 억지끼워맞춤으로 조립을 한다. Then, the outer diameter of the hub 300 is formed slightly larger than the inner diameter of the rotor 200, and assembled by fitting to the inner diameter of the rotor 200 in a state in which the hub 300 is compressed through cooling or pressing. Do it.
이와 같은 억지끼워맞춤으로 조립을 함으로써, 플라이휠의 회전시 로터(200)가 반경 방향으로 많이 팽창되어도 허브(300)가 로터(200)와 회전축(100)을 지속적으로 연결할 수 있게 된다.By assembling with such interference fit, even when the rotor 200 is expanded in the radial direction during the rotation of the flywheel, the hub 300 is able to continuously connect the rotor 200 and the rotating shaft 100.
이상과 같이 본 발명의 일실시예에서는 구체적인 구성 요소 등과 같은 특정 사항들과 한정된 실시예 및 도면에 의해 설명되었으나 이는 본 발명의 보다 전반적인 이해를 돕기 위해서 제공된 것일 뿐, 본 발명은 상기의 실시예에 한정되는 것은 아니며, 본 발명이 속하는 분야에서 통상적인 지식을 가진 자라면 이러한 기재로부터 다양한 수정 및 변형이 가능하다. 따라서, 본 발명의 사상은 설명된 실시예에 국한되어 정해져서는 아니 되며, 후술하는 특허청구범위뿐 아니라 이 특허청구범위와 균등하거나 등가적 변형이 있는 모든 것들은 본 발명 사상의 범주에 속한다고 할 것이다.As described above, one embodiment of the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided only to help a more general understanding of the present invention. The present invention is not limited thereto, and various modifications and variations can be made by those skilled in the art to which the present invention pertains. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all of the equivalents and equivalents of the claims, as well as the following claims, will fall within the scope of the present invention. .
본 발명은 에너지 저장 장치 등에 사용될 수 있다.The present invention can be used for energy storage devices and the like.
Claims (10)
- 플라이휠의 로터와 회전축을 상호 연결하는 플라이휠용 허브의 제조방법에 있어서,In the manufacturing method of the flywheel hub for connecting the rotor and the rotation axis of the flywheel,복합재료를 와인딩하여 중공의 압력용기 형상으로 형성하는 와인딩 단계;Winding the composite material to form a hollow pressure vessel shape;와인딩된 복합재료를 경화시키는 경화 단계; 및A curing step of curing the wound composite material; And압력용기 형상으로 와인딩된 복합재료를 돔형상으로 절단하는 커팅 단계;를 포함하며,And a cutting step of cutting the composite material wound in the shape of a pressure vessel into a dome shape.상기 와인딩 단계는 상기 회전축의 길이 방향을 따라 일단에는 상기 회전축이 삽입되는 삽입공이 형성되고 타단에는 개구부가 형성되도록 중공 형태의 메인 돔을 형성하는 단계 및 상기 메인 돔을 형성하는 복합재료와 다른 각도로 상기 메인 돔의 외면에 복합재료를 와인딩하여 서브돔을 형성하는 단계를 포함하는, 플라이휠용 허브의 제조방법.The winding step may include forming a hollow main dome such that an insertion hole into which the rotating shaft is inserted is formed at one end and an opening is formed at the other end along the longitudinal direction of the rotating shaft, and at a different angle from the composite material forming the main dome. And winding a composite material on the outer surface of the main dome to form a subdome.
- 제1항에 있어서,The method of claim 1,상기 서브돔을 형성하는 단계는,Forming the subdome,상기 메인 돔의 외면에 제1서브돔을 와인딩하고 상기 제1서브돔의 외면에 제2서브돔을 와인딩하며,Winding a first sub dome on an outer surface of the main dome and a second sub dome on an outer surface of the first sub dome,상기 메인 돔, 상기 제1서브돔 및 상기 제2서브돔은 복합재료를 서로 다른 각도로 와인딩하는, 플라이휠용 허브의 제조방법.The main dome, the first subdome and the second subdome is a method for manufacturing a hub for a flywheel, winding the composite material at different angles.
- 제2항에 있어서,The method of claim 2,성기 서브돔을 형성하는 단계에서, In the step of forming a genital subdome,상기 제1서브돔은 상기 메인 돔의 와인딩 각도 보다 작은 각도로 복합재료를 와인딩하고, 상기 제2서브돔은 상기 제1서브돔의 와인딩 각도 보다 작은 각도로 복합재료를 와인딩하는, 플라이휠용 허브의 제조방법.Wherein the first sub dome winding the composite material at an angle smaller than the winding angle of the main dome, the second sub dome of the flywheel hub for winding the composite material at an angle smaller than the winding angle of the first sub dome Manufacturing method.
- 제3항에 있어서,The method of claim 3,상기 서브돔을 형성하는 단계에서, In the step of forming the subdome,상기 메인 돔은 상기 제1서브돔의 두께 보다 작은 두께를 가지도록 복합재료를 와인딩하고, 상기 제2서브돔의 두께 보다는 큰 두께를 가지도록 복합재료를 와인딩하는, 플라이휠용 허브의 제조방법.The main dome is winding the composite material to have a thickness less than the thickness of the first sub-dome, and winding the composite material to have a thickness larger than the thickness of the second sub-dome, manufacturing method of a hub for a flywheel.
- 제2항 내지 제4항 중 어느 한 항에 있어서,The method according to any one of claims 2 to 4,상기 서브돔을 형성하는 단계에서,In the step of forming the subdome,상기 제1서브돔은 상기 메인 돔의 외면에 대하여 상기 제2서브돔의 복합재료 와인딩 시작 위치와 다른 위치에서 복합재료를 와인딩하기 시작하는, 플라이휠용 허브의 제조방법.And the first sub dome starts winding the composite material at a position different from the starting position of the composite winding of the second sub dome with respect to the outer surface of the main dome.
- 제5항에 있어서,The method of claim 5,상기 서브돔을 형성하는 단계에서,In the step of forming the subdome,상기 제1서브돔은 상기 제2서브돔의 복합재료 와인딩 시작 위치 보다 상기 삽입공 가까이에서 복합재료를 와인딩하기 시작하는, 플라이휠용 허브의 제조방법.And the first subdome starts winding the composite material closer to the insertion hole than the composite winding start position of the second subdome.
- 제5항에 있어서,The method of claim 5,상기 서브돔을 형성하는 단계에서,In the step of forming the subdome,상기 제1서브돔의 복합재료 와인딩 시작 위치는 상기 메인 돔의 원추부의 외면에 위치하는, 플라이휠용 허브의 제조방법.Composite winding start position of the first sub dome is located on the outer surface of the cone portion of the main dome, manufacturing method of the flywheel hub.
- 제5항에 있어서,The method of claim 5,상기 와인딩 단계는,The winding step,상기 메인 돔은 상기 삽입공 측의 두께가 상기 개구부 측의 두께 보다 크도록 복합재료를 와인딩하는, 플라이휠용 허브의 제조방법.The main dome is a method for manufacturing a hub for a flywheel, winding the composite material such that the thickness of the insertion hole side is larger than the thickness of the opening side.
- 제5항에 있어서,The method of claim 5,상기 서브돔을 형성하는 단계는,Forming the subdome,상기 메인 돔의 외면에 대하여 상기 제1서브돔 및 상기 제2서브돔의 복합재료 와인딩 시작위치를 다르게 하여 상기 허브의 반경 방향 강성을 조절하는, 플라이휠용 허브의 제조방법.And controlling the radial stiffness of the hub by varying the starting position of the composite winding of the first sub dome and the second sub dome with respect to the outer surface of the main dome.
- 제5항에 있어서,The method of claim 5,상기 서브돔을 형성하는 단계는,Forming the subdome,상기 회전축의 길이 방향으로의 복합재료의 와인딩 길이는 상기 메인 돔, 상기 제1서브돔 및 상기 제2서브돔의 순으로 증가하도록 복합재료를 와인딩하는, 플라이휠용 허브의 제조방법.And winding the composite material such that the winding length of the composite material in the longitudinal direction of the rotating shaft increases in the order of the main dome, the first sub dome and the second sub dome.
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KR1020100095757A KR101033108B1 (en) | 2010-10-01 | 2010-10-01 | Method for manufacturing hub used in flywheel |
KR10-2010-0095757 | 2010-10-01 |
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WO2012043939A1 true WO2012043939A1 (en) | 2012-04-05 |
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Cited By (2)
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EP2698557A1 (en) * | 2012-08-14 | 2014-02-19 | Enrichment Technology Deutschland GmbH | Flywheel energy storage device |
CN114844288A (en) * | 2022-06-09 | 2022-08-02 | 中国科学院工程热物理研究所 | Anti-separation flywheel rotor structure and energy storage system |
Families Citing this family (1)
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KR101290887B1 (en) | 2011-06-21 | 2013-07-29 | 한양대학교 에리카산학협력단 | Composite rotor for high-speed rotation and assembling method of the same |
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EP0066040A1 (en) * | 1981-05-29 | 1982-12-08 | Rockwell International Corporation | Flywheel shell construction |
JPH0715300B2 (en) * | 1984-12-07 | 1995-02-22 | アジヤンス スパシヤル ユーロペエンヌ | Energy storage wheel |
JPH09267402A (en) * | 1996-04-03 | 1997-10-14 | Toray Ind Inc | Fly wheel and its production |
JP2001500950A (en) * | 1996-08-27 | 2001-01-23 | ダウ―ユナイテッド テクノロジーズ コンポジット プロダクツ,インコーポレイティド | Composite flywheel rim and hub made of composite material |
-
2010
- 2010-10-01 KR KR1020100095757A patent/KR101033108B1/en not_active IP Right Cessation
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- 2011-01-11 WO PCT/KR2011/000157 patent/WO2012043939A1/en active Application Filing
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EP0066040A1 (en) * | 1981-05-29 | 1982-12-08 | Rockwell International Corporation | Flywheel shell construction |
JPH0715300B2 (en) * | 1984-12-07 | 1995-02-22 | アジヤンス スパシヤル ユーロペエンヌ | Energy storage wheel |
JPH09267402A (en) * | 1996-04-03 | 1997-10-14 | Toray Ind Inc | Fly wheel and its production |
JP2001500950A (en) * | 1996-08-27 | 2001-01-23 | ダウ―ユナイテッド テクノロジーズ コンポジット プロダクツ,インコーポレイティド | Composite flywheel rim and hub made of composite material |
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EP2698557A1 (en) * | 2012-08-14 | 2014-02-19 | Enrichment Technology Deutschland GmbH | Flywheel energy storage device |
WO2014026970A1 (en) * | 2012-08-14 | 2014-02-20 | Enrichment Technology Deutschland Gmbh | Flywheel energy store |
JP2015532700A (en) * | 2012-08-14 | 2015-11-12 | エンリッチメント テクノロジー カンパニー リミテッドEnrichment Technology Company Ltd. | Flywheel energy storage device |
US9816583B2 (en) | 2012-08-14 | 2017-11-14 | Enrichment Technology Deutschland Gmbh | Flywheel energy store |
CN114844288A (en) * | 2022-06-09 | 2022-08-02 | 中国科学院工程热物理研究所 | Anti-separation flywheel rotor structure and energy storage system |
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