CN111463956A - High-power magnetic suspension energy storage flywheel system with large electric quantity - Google Patents
High-power magnetic suspension energy storage flywheel system with large electric quantity Download PDFInfo
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- CN111463956A CN111463956A CN202010455004.4A CN202010455004A CN111463956A CN 111463956 A CN111463956 A CN 111463956A CN 202010455004 A CN202010455004 A CN 202010455004A CN 111463956 A CN111463956 A CN 111463956A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 53
- 239000000725 suspension Substances 0.000 title claims abstract description 30
- 230000005284 excitation Effects 0.000 claims abstract description 61
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims description 27
- 238000003475 lamination Methods 0.000 claims description 16
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
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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
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a high-power magnetic suspension energy storage flywheel system with large electric quantity, which comprises: the invention relates to a magnetic resistance type rotating transformer, which comprises a base, a stator shell, an upper cover, a top end sealing circular plate, a rotor system, an upper radial mixed magnetic bearing stator, a lower radial mixed magnetic bearing stator, an axial permanent magnet passive magnetic bearing, a mixed excitation homopolar inductor motor stator, a first fastening bolt for connecting the base and the stator shell, a second fastening bolt for connecting the stator shell and the upper cover, a third fastening bolt for connecting the upper cover and the top end sealing circular plate, a lower end spare bearing system, a lower end spare bearing chamber, a magnetic resistance type rotating transformer stator, an upper end spare bearing chamber and an upper end spare bearing system. Therefore, the rotor has the advantages of compact structure, high specific energy utilization rate of the rotor, high rotor strength, low rotating iron consumption and the like. The invention is used for 15-minute flywheel UPS batteries, power-assisted frequency modulation energy storage batteries and high-frequency charge-discharge special batteries.
Description
Technical Field
The invention relates to a high-power magnetic suspension energy storage flywheel system with large electric quantity, in particular to a homopolar inductor motor generator with active and passive hybrid magnetic suspension bearing support and permanent magnet and electromagnetic hybrid excitation.
Background
The existing energy storage flywheel motor generator adopts a three-phase permanent magnet synchronous motor, a three-phase asynchronous motor or an electrically excited synchronous reluctance motor. When the energy storage flywheel discharges, the back electromotive force of the permanent magnet synchronous motor decreases along with the reduction of the rotating speed, the output power of the flywheel motor also decreases along with the increase of the discharging depth, and the continuous discharging of the rated power cannot be ensured. Although the electric excitation synchronous reluctance motor can keep the back electromotive force constant along with the reduction of the rotating speed by increasing the exciting current, the exciting current needs to be continuously increased along with the reduction of the rotating speed, so that the exciting coil generates heat, generally, a flywheel runs in a vacuum environment, the heat dissipation condition is poor, the temperature of a stator of the motor is difficult to be overhigh, the temperature balance is difficult to be achieved under the working condition of rated power output, and the electric excitation synchronous reluctance motor is large in size and low in efficiency. The existing rotor supporting scheme of the commercial energy storage flywheel product comprises the following steps: the scheme of upper and lower radial permanent magnet passive support and axial needle type oil film bearing; the scheme of upper and lower radial mechanical bearing support and axial electromagnetic bearing unloading support; a five-freedom fully-active magnetic bearing supporting scheme. The first two rotor support solutions are capable of supporting limited rotor weight; the safety of the third supporting scheme cannot be fully ensured, and high-speed instability can cause damage to the flywheel and even serious accidents. Therefore, a brand new scheme needs to be researched and designed for the high-electric-quantity energy storage flywheel, and the safe and reliable support of the heavy rotor is met.
Disclosure of Invention
The invention solves the problems: the defects of the prior art are overcome, and the large-electric-quantity high-power magnetic suspension energy storage flywheel system has a series of advantages of safe and reliable rotor support, high utilization rate of specific energy density of the rotor, high excitation efficiency, compact space, low loss and the like. The invention is used for 15-minute flywheel UPS batteries, power-assisted frequency modulation energy storage batteries and high-frequency charge-discharge special batteries.
The invention provides a high-power magnetic suspension energy storage flywheel system with large electric quantity, wherein a permanent magnet passive magnetic bearing is adopted as an axial support of a rotor, and a permanent magnet bias hybrid magnetic suspension bearing is arranged in the vertical radial direction. The rotor of the flywheel motor is a high-strength alloy steel solid rotor, convex poles and concave poles of the rotor are uniformly distributed along the circumference, and the upper end and the lower end of the rotor are of anti-symmetric structures. The excitation of the energy storage flywheel motor is positioned on the stator side of the motor, a mixed excitation mode of a permanent magnet and electric excitation is adopted, an electric excitation winding is wound along the circumferential direction of the rotor, an external current is introduced to generate a space magnetic field, excitation magnetic flux comes out from one end of the rotor and enters the other end of the rotor through an outer magnetic conduction ring and an air gap, and the polarities of the magnetic poles at the upper end and the lower end of the rotor are opposite. The stator winding is parallel to the central axis of the rotor and is uniformly distributed along the circumferential direction of the rotor, and is wound according to a certain rule, three-phase current is introduced into the stator winding to generate a space rotating magnetic field, the motor is driven to rotate by induction electromagnetic force corresponding to the salient pole of the rotor, and the rotor is of a solid structure without permanent magnets and has no polarity alternation of magnetic poles along the circumferential magnetic field. Therefore, the rotor has the advantages of compact structure, high specific energy utilization rate of the rotor, high rotor strength, low rotating iron consumption and the like.
The motor rated power of the high-power magnetic suspension energy storage flywheel system is 500kW, the electricity storage capacity is 125kWh, the rated rotating speed is 9000rpm, when the energy storage flywheel generates electricity, the rotor speed reduction kinetic energy is converted into electric energy, the motor works in a constant power section from 9000rpm to 6000rpm, the motor reduces from 6000rpm to 2000rpm to ensure the rated power output by increasing the current of the electric excitation winding, and the current value of the electric excitation winding of the motor ranges from 5A to 20A.
The technical scheme of the invention is that a large-electric-quantity high-power magnetic suspension energy storage flywheel system comprises: the magnetic reluctance type induction motor comprises a base, a stator shell, an upper cover, a top end sealing circular plate, a rotor system, an upper radial mixed magnetic bearing stator, a lower radial mixed magnetic bearing stator, an axial permanent magnet driven magnetic bearing, a mixed excitation homopolar inductor motor stator, a first fastening bolt for connecting the base and the stator shell, a second fastening bolt for connecting the stator shell and the upper cover, a third fastening bolt for connecting the upper cover and the top end sealing circular plate, a lower end spare bearing system, a lower end spare bearing chamber, a reluctance type rotary transformer stator, an upper end spare bearing chamber and an upper end spare bearing system, wherein the base is connected with the stator shell through uniformly distributed first fastening bolts, the stator shell is connected with the upper cover through uniformly distributed second fastening bolts, the upper cover is connected with the top end sealing circular plate through uniformly distributed third fastening bolts, and the axial permanent magnet driven magnetic bearing and the lower radial mixed stator are arranged on the base, the upper radial hybrid magnetic bearing stator and the reluctance type rotary transformer stator are installed on the upper cover, the hybrid excitation homopolar inductor motor stator is installed on a stator shell in an interference hot-fitting mode, a lower end spare bearing system is installed in a lower end spare bearing chamber, the lower end spare bearing chamber is installed on the base, an upper end spare bearing system is installed in an upper end spare bearing chamber, and the upper end spare bearing chamber is installed on the upper cover.
Furthermore, the radial direction of the rotor system adopts a four-degree-of-freedom hybrid magnetic suspension bearing for supporting, the lower end of the rotor axially adopts an axial permanent magnet passive magnetic bearing which does not need active control for supporting, and an electric excitation winding of a stator of the hybrid excitation homopolar inductor motor provides additional axial damping.
Further, the axial permanent magnet passive magnetic bearing comprises an axial magnetizing permanent magnet ring A, a permanent magnet ring B, a permanent magnet ring C, a permanent magnet ring D, a permanent magnet ring E, an outer sheath and an inner sheath which are sequentially connected; the permanent magnet rings are bonded through magnet steel glue, the outer sheath is hooped on the outer side of the permanent magnet ring E in an interference hot-assembling mode, and the inner sheath and the permanent magnet ring A are pressed on the inner side of the permanent magnet ring A in a liquid nitrogen cold-assembling mode.
Further, the stator of the axial permanent-magnet passive magnetic bearing uses 16 uniformly distributed bolts and is fixedly connected with the base through 16 uniformly distributed bolt holes; the stator and the rotor assembly of the axial permanent magnet passive magnetic bearing of the magnetic suspension energy storage flywheel system have the same mechanical structure and magnetic circuit structure, and the rotor of the axial permanent magnet passive magnetic bearing is fixedly connected with the rotor system by 16 uniformly distributed bolt holes through 16 uniformly distributed bolt holes after being overturned by 180 degrees; the number of the permanent magnet rings of the axial permanent magnet passive magnetic bearing is odd, and the number of the permanent magnet rings is one of 3, 5, 7 and 9.
Furthermore, the rated rotating speed of the energy storage flywheel is 9000rpm, when the energy storage flywheel generates electricity, the speed reduction kinetic energy of the rotor is converted into electric energy, the motor works in a constant power section from 9000rpm to 6000rpm, the motor reduces from 6000rpm to 2000rpm to ensure rated power output by increasing the current of the electric excitation winding, and the current value range of the electric excitation winding of the motor is 5A-20A.
Furthermore, the energy storage flywheel rotor system comprises an upper radial hybrid magnetic bearing rotor component, a lower radial hybrid magnetic bearing rotor component, a rotor pole of a hybrid excitation homopolar inductor motor, a rotor energy storage body, an axial permanent magnet passive magnetic bearing rotor component, an upper rotor hoisting hole and a lower rotor hoisting hole, the upper radial mixed magnetic bearing rotor component comprises a first electrician pure iron magnetic conductive ring, a first cold-rolled non-oriented upper magnetic conductive lamination ring, a first lower magnetic conductive lamination ring, a first displacement sensor detection ring and a first rotor radial magnetic component locking nut which are arranged on a rotor energy storage body in a hot-mounting mode, the lower radial hybrid magnetic bearing rotor assembly comprises a second electrical pure iron magnetic conduction ring, a second cold-rolled non-oriented upper magnetic conduction lamination ring, a second lower magnetic conduction lamination ring, a second displacement sensor detection ring and a second rotor radial magnetic assembly locking nut which are thermally arranged on a rotor energy storage body.
Further, the hybrid excitation homopolar inductor motor stator comprises a stator winding, a cold-rolled non-oriented upper magnetic conduction stator core lamination ring, a lower magnetic conduction stator core lamination ring, a circumferentially coiled electric excitation winding, an electrical pure iron excitation magnetic conduction ring, an upper permanent magnet ring and a lower permanent magnet ring, wherein bolts are used for fastening the motor stator assembly, and bolts are used for fastening the motor stator assembly and a stator shell.
Furthermore, the number of turns of an electric excitation winding which is wound on the stator of the hybrid excitation homopolar inductor motor in the circumferential direction is 300, the air gap of the stator and the rotor of the hybrid excitation homopolar inductor motor generator is 4mm, and the axial thickness of the permanent magnet ring is 40 mm.
Compared with the prior art, the invention has the advantages that:
(1) the energy storage flywheel rotor has compact structure and high strength. The excitation winding and the permanent magnet of the mixed excitation homopolar inductor motor are both positioned on a motor stator, while the traditional permanent magnet synchronous motor mostly adopts sintered neodymium iron boron permanent magnet materials, the compression strength of the traditional permanent magnet synchronous motor is larger and can reach 1000MPa, the tensile strength of the traditional permanent magnet synchronous motor is only about 80MPa, a novel rotor structure of an integral permanent magnet and a non-magnetic-conductive high-strength alloy steel sheath or a composite material sheath such as carbon fiber, glass fiber and the like is needed, an elastic mechanics thick-walled cylinder theory and a finite element contact theory need to be applied to the sheath, a high-speed permanent magnet rotor stress calculation model is established to determine the magnitude of interference between the sheath and the permanent magnet, the analysis design and the processing and assembly process of the permanent magnet rotor of the composite structure are complex, and meanwhile, the diameter of a rotor part of the motor is limited by the thin-walled; the excitation winding and the permanent magnet are both positioned on the motor stator, the strength of the rotor is the tensile strength of the material, the rotor has a compact structure and high utilization rate of specific energy density, and the robustness of the rotor structure is obviously improved.
(2) The radial direction of the rotor is supported by a four-degree-of-freedom hybrid magnetic suspension bearing, the lower end of the rotor is axially supported by an axial permanent magnet passive magnetic bearing which does not need active control, an electric excitation winding of a stator of the hybrid excitation homopolar inductor motor provides additional axial damping, the weight of the supported rotor is improved to dozens of tons or even tens of tons from one or two hundred kilograms, and the electric storage capacity of the energy storage flywheel at the rated rotating speed is improved to dozens of degrees or even hundreds of degrees from a few degrees; the bearing structure has no instability problem caused by control failure in the axial direction, and the intrinsic safety and reliability of the operation of the rotor system are fully ensured.
Drawings
FIG. 1 is a cross-sectional view of a high-power magnetic suspension energy storage flywheel system with large electric quantity according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of a high-capacity high-power magnetic suspension energy storage flywheel rotor system according to an embodiment of the invention;
FIG. 3 is a cross-sectional view of a hybrid excitation homopolar inductor motor-generator stator according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a radial hybrid magnetic bearing stator according to an embodiment of the present invention;
fig. 5 is a cross-sectional view of an axial permanent magnet passive magnetic bearing according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
As shown in figure 1, the large-power and high-power magnetic suspension energy storage flywheel system has the motor rated power of 500kW, the electric storage capacity of 125kWh and the rated rotating speed of 9000rpm, when the energy storage flywheel generates electricity, the rotor deceleration kinetic energy is converted into electric energy, the motor works in a constant power section from 9000rpm to 6000rpm, the motor reduces from 6000rpm to 2000rpm to ensure rated power output by increasing the current of an electric excitation winding, and the current value of the electric excitation winding of the motor ranges from 5A to 20A.
The large-electricity high-power magnetic suspension energy storage flywheel system comprises a base 1, a stator shell 2, an upper cover 3, a top end sealing circular plate 4, a rotor system 5, an upper radial hybrid magnetic bearing stator 6, a lower radial hybrid magnetic bearing stator 7, an axial permanent magnet passive magnetic bearing 8, a hybrid excitation homopolar inductor motor stator 9, first fastening bolts 10 of the base 1 and the stator shell 2, second fastening bolts 11 of the stator shell 2 and the upper cover 3, third fastening bolts 12 of the upper cover 3 and the top end sealing circular plate 4, a lower end spare bearing system 13, a lower end spare bearing chamber 14, a reluctance type rotary transformer stator 15, an upper end spare bearing chamber 16 and an upper end spare bearing system 17;
specifically, the base 1 is connected with the stator housing 2 through 16 uniformly distributed first fastening bolts 10, the stator housing 2 is connected with the upper cover 3 through 16 uniformly distributed second fastening bolts 11, the upper cover 3 is connected with the top end sealing circular plate 4 through 16 uniformly distributed third fastening bolts 12, the axial permanent magnet passive magnetic bearing 8 and the lower radial hybrid magnetic bearing stator 7 are installed on the base 1, the upper radial hybrid magnetic bearing stator 6 and the reluctance type rotary transformer stator 15 are installed on the upper cover 3, the hybrid excitation homopolar inductor motor stator 9 is installed on the stator housing 2 in an interference hot-assembling mode, the lower end backup bearing system 13 is installed in the lower end backup bearing chamber 14, the lower end backup bearing chamber 14 is installed on the base 1, the upper end backup bearing system 17 is installed in the upper end backup bearing chamber 16, and the upper end backup bearing chamber 16 is installed on the upper cover 3. The maximum diameter of the energy storage flywheel rotor is 1600 mm. The lower end spare bearing system 13 and the upper end spare bearing system 17 are two heavy-load angular contact bearings which are installed face to face, the bearings are lubricated by lithium-based lubricating oil which can not be volatilized in a vacuum environment, and the unilateral gap between the inner ring of each spare bearing and the rotor is 0.6 mm.
As shown in fig. 2, the large-power and high-power magnetic suspension energy storage flywheel rotor system of the invention comprises an upper radial hybrid magnetic bearing rotor assembly, a lower radial hybrid magnetic bearing rotor assembly, a hybrid excitation homopolar inductor motor rotor pole 506, a rotor energy storage body 505, an axial permanent magnet passive magnetic bearing rotor assembly, an upper rotor hoisting hole 501 and a lower rotor hoisting hole 512; a rotor assembly 507; the upper radial hybrid magnetic bearing rotor assembly comprises a first electrical pure iron magnetic conductive ring 514, a first cold-rolled non-oriented upper magnetic conductive lamination ring 502, a first lower magnetic conductive lamination ring 504, a first displacement sensor detection ring 503 and a first rotor radial magnetic assembly locking nut 515 which are thermally mounted on a rotor energy storage body 505, and the lower radial hybrid magnetic bearing rotor assembly comprises a second electrical pure iron magnetic conductive ring 513, a second cold-rolled non-oriented upper magnetic conductive lamination ring 508, a second lower magnetic conductive lamination ring 510, a second displacement sensor detection ring 509 and a second rotor radial magnetic assembly locking nut 511 which are thermally mounted on the rotor energy storage body 505.
As shown in fig. 3, the hybrid excitation homopolar inductor motor-generator stator according to the embodiment of the present invention includes a stator winding 901, a cold-rolled non-oriented upper magnetically permeable stator core lamination ring 902 and a lower magnetically permeable stator core lamination ring 906, a circumferentially wound electrical excitation winding 904, an electrical pure iron excitation magnetic permeability ring 905, an upper permanent magnet ring 903 and a lower permanent magnet ring 907, bolts 909 are used to fasten the motor stator assembly, and bolts 908 are used to fasten the motor stator assembly to the stator housing 2. A magnetic field generated after the circumferentially wound electrical excitation winding 904 is fed with direct current excitation current is closed by an electrical pure iron excitation magnetic conduction ring 905, a cold-rolled non-oriented upper magnetic conduction stator core lamination ring 902, a motor stator and rotor air gap, a mixed excitation homopolar inductor motor rotor pole 506, a motor stator and rotor air gap and a lower magnetic conduction stator core lamination ring 906. The magnetizing directions of the upper permanent magnet ring 903 and the lower permanent magnet ring 907 are inclined at an angle of 45 degrees along the radial direction, and the generated permanent magnetic excitation magnetic field is closed through an electrician pure iron excitation magnetic conduction ring 905, a cold-rolled non-oriented upper magnetic conduction stator core laminated ring 902, a motor stator and rotor air gap, a mixed excitation homopolar inductor motor rotor pole 506, a motor stator and rotor air gap and a lower magnetic conduction stator core laminated ring 906. The number of turns of the circumferentially coiled electric excitation winding 904 is 300, the air gap of the stator and the rotor of the hybrid excitation homopolar inductor motor generator is 4mm, and the axial thickness of the permanent magnet ring is 40 mm.
As shown in fig. 4, the radial hybrid magnetic bearing stator according to the embodiment of the present invention includes 8 magnetic bearing control windings 701, 4 displacement sensor stator assemblies 702 uniformly distributed along the circumferential direction, magnetic conductive laminated magnetic poles 703, an upper electrical pure iron magnetic conductive ring 705, an axial magnetization permanent magnetic ring 706, and a lower electrical pure iron magnetic conductive ring 707, where the upper and lower magnetic conductive laminated magnetic poles 703 and the displacement sensor stator assemblies 702 are fastened into a whole by 4 uniformly distributed bolts 704, and the upper electrical pure iron magnetic conductive ring 705 and the lower electrical pure iron magnetic conductive ring 707 are mounted on a radial magnetic isolation magnetic bearing 709 in an interference thermal installation manner. The lower radial hybrid magnetic bearing stator is fixedly connected with the base 1 through 16 evenly distributed bolt holes 708 by using 16 evenly distributed bolts. The structure of an upper radial hybrid magnetic bearing component of the high-power magnetic suspension energy storage flywheel system with large electric quantity is completely the same as that of a lower radial hybrid magnetic bearing component, and after the upper radial hybrid magnetic bearing stator is turned over 180, 16 uniformly distributed bolts are used for being tightly connected with the upper cover 3 through 16 uniformly distributed bolt holes 708. The unilateral air gap between the stator and the rotor of the radial hybrid magnetic bearing is 1 mm.
As shown in fig. 5, the axial permanent-magnet passive magnetic bearing 8 according to the embodiment of the present invention includes an axial magnetizing permanent-magnet ring a803, a permanent-magnet ring B804, a permanent-magnet ring C805, a permanent-magnet ring D806, a permanent-magnet ring E807, an outer sheath 808, and an inner sheath 801. The permanent magnet rings are bonded through special magnetic steel glue, the outer sheath 808 is hooped outside the permanent magnet ring E807 in an interference hot-assembling mode, and the inner sheath 801 and the permanent magnet ring A803 are pressed and mounted on the inner side of the permanent magnet ring A803 in a liquid nitrogen cold-assembling mode. The stator of the axial permanent magnet passive magnetic bearing has the same mechanical structure and magnetic circuit structure as the rotor assembly 507 of fig. 2. The stator of the axial permanent-magnet passive magnetic bearing uses 16 uniformly distributed bolts and is fixedly connected with the base 1 through 16 uniformly distributed bolt holes 802. The stator and the rotor assembly of the axial permanent magnet passive magnetic bearing of the high-power magnetic suspension energy storage flywheel system with large electric quantity have completely same mechanical structure and magnetic circuit structure, and the rotor of the axial permanent magnet passive magnetic bearing is fixedly connected with the rotor system 5 by 16 uniformly distributed bolt holes 802 through 16 uniformly distributed bolts after being overturned by 180 degrees. The number of the permanent magnet rings of the axial permanent magnet passive magnetic bearing is generally odd, the number of the permanent magnet rings can be 3, 5, 7 or 9, and a 5-ring structure is adopted in the embodiment. The magnetizing direction of the permanent magnet ring A803 is an axial magnetizing upper end N pole, the magnetizing direction of the permanent magnet ring B804 is a radial magnetizing outer side N pole, the magnetizing direction of the permanent magnet ring C805 is an axial magnetizing upper end N pole, the magnetizing direction of the permanent magnet ring D806 is a radial magnetizing inner side N pole, the magnetizing direction of the permanent magnet ring E807 is an axial magnetizing upper end N pole, and each ring of permanent magnets are formed by splicing a plurality of permanent magnets into a whole ring.
Exemplary embodiments of high-capacity high-power magnetic levitation energy storage flywheel systems are described above in detail, but the systems are not limited to the specific embodiments described herein. While the description has been with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted within the scope of the description. In addition, modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the essential scope thereof. Therefore, it is intended that the specification not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the disclosure will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. A large-electric-quantity high-power magnetic suspension energy storage flywheel system is characterized by comprising: the permanent magnet synchronous motor comprises a base (1), a stator shell (2), an upper cover (3), a top end sealing circular plate (4), a rotor system (5), an upper radial mixed magnetic bearing stator (6), a lower radial mixed magnetic bearing stator (7), an axial permanent magnet passive magnetic bearing (8), a mixed excitation homopolar inductor motor stator (9), a first fastening bolt (10) for connecting the base (1) and the stator shell (2), a second fastening bolt (11) for connecting the stator shell (2) and the upper cover (3), a third fastening bolt (12) for connecting the upper cover (3) and the top end sealing circular plate (4), a lower end spare bearing system (13), a lower end spare bearing chamber (14), a reluctance type rotary transformer stator (15), an upper end spare bearing chamber (16) and an upper end spare bearing system (17);
the stator structure is characterized in that a base (1) is connected with a stator shell (2) through 16 uniformly distributed first fastening bolts (10), the stator shell (2) is connected with an upper cover (3) through 16 uniformly distributed second fastening bolts (11), the upper cover (3) is connected with a top end sealing circular plate (4) through 16 uniformly distributed third fastening bolts (12), an axial permanent magnet passive magnetic bearing (8) and a lower radial mixed magnetic bearing stator (7) are installed on the base (1), an upper radial mixed magnetic bearing stator (6) and a reluctance type rotary transformer stator (15) are installed on the upper cover (3), a mixed excitation homopolar inductor motor stator (9) is installed on the stator shell (2) in an interference hot-assembling mode, a lower end backup bearing system (13) is installed in a lower end backup bearing chamber (14), a lower end backup bearing chamber (14) is installed on the base (1), an upper end backup bearing system (17) is installed in an upper end backup bearing chamber (16), the upper end spare bearing chamber (16) is arranged on the upper cover (3).
2. The large-electric-quantity high-power magnetic suspension energy storage flywheel system according to claim 1, characterized in that:
the radial direction of the rotor system (5) adopts a four-degree-of-freedom hybrid magnetic suspension bearing support, the lower end of the rotor axially adopts an axial permanent magnet passive magnetic bearing support which does not need active control, and an electric excitation winding of a stator of the hybrid excitation homopolar inductor motor provides additional axial damping.
3. The large-electric-quantity high-power magnetic suspension energy storage flywheel system according to claim 1, characterized in that:
the axial permanent magnet passive magnetic bearing (8) comprises an axial magnetizing permanent magnet ring A (803), a permanent magnet ring B (804), a permanent magnet ring C (805), a permanent magnet ring D (806), a permanent magnet ring E (807), an outer sheath (808) and an inner sheath (801) which are sequentially connected; the permanent magnet rings are bonded through magnetic steel glue, the outer sheath (808) is hooped on the outer side of the permanent magnet ring E (807) in an interference hot-assembling mode, and the inner sheath (801) and the permanent magnet ring A (803) are pressed on the inner side of the permanent magnet ring A (803) in a liquid nitrogen cold-assembling mode.
4. A large-power high-power magnetic suspension energy storage flywheel system according to claim 3, characterized in that:
the stator of the axial permanent-magnet passive magnetic bearing (8) uses 16 uniformly distributed bolts and is fixedly connected with the base (1) through 16 uniformly distributed bolt holes (802); the stator and the rotor component of an axial permanent magnet passive magnetic bearing (8) of the magnetic suspension energy storage flywheel system have the same mechanical structure and magnetic circuit structure, and the rotor of the axial permanent magnet passive magnetic bearing is fixedly connected with a rotor system (5) through 16 uniformly distributed bolt holes (802) after being overturned by 180 degrees; the number of the permanent magnet rings of the axial permanent magnet passive magnetic bearing is odd, and the number of the permanent magnet rings is one of 3, 5, 7 and 9.
5. The large-electric-quantity high-power magnetic suspension energy storage flywheel system according to claim 1, characterized in that:
the rated rotating speed of the energy storage flywheel is 9000rpm, when the energy storage flywheel generates electricity, the speed reduction kinetic energy of a rotor is converted into electric energy, the motor works in a constant power section from 9000rpm to 6000rpm, the motor works in a constant power section from 6000rpm to 2000rpm by increasing the current of an electric excitation winding to ensure the rated power output, and the current value range of the electric excitation winding of the motor is 5A-20A.
6. The large-electric-quantity high-power magnetic suspension energy storage flywheel system according to claim 1, characterized in that:
the energy storage flywheel rotor system comprises an upper radial hybrid magnetic bearing rotor assembly, a lower radial hybrid magnetic bearing rotor assembly, a rotor pole (506) of a hybrid excitation homopolar inductor motor, a rotor energy storage body (505), an axial permanent magnet passive magnetic bearing rotor assembly, an upper rotor hoisting hole (501) and a lower rotor hoisting hole (512), wherein the upper radial hybrid magnetic bearing rotor assembly comprises a first electrician pure iron magnetic conductive ring (514), a first cold-rolled non-oriented upper magnetic conductive laminated ring (502), a first lower magnetic conductive laminated ring (504), a first displacement sensor detection ring (503) and a first rotor radial magnetic assembly locking nut (515) which are thermally mounted on the rotor energy storage body (505), and the lower radial hybrid magnetic bearing rotor assembly comprises a second electrician pure iron magnetic conductive ring (513), a second cold-rolled non-oriented upper magnetic conductive laminated ring (508) and a second lower magnetic conductive laminated ring (510) which are thermally mounted on the rotor energy storage body (505), A second displacement sensor detection ring (509) and a second rotor radial magnetic assembly locking nut (511).
7. The large-electric-quantity high-power magnetic suspension energy storage flywheel system according to claim 1, characterized in that:
the mixed excitation homopolar inductor motor stator comprises a stator winding (901), a cold-rolled non-oriented upper magnetic conduction stator core lamination ring (902), a lower magnetic conduction stator core lamination ring (906), a circumferentially coiled electric excitation winding (904), an electrical pure iron excitation magnetic conduction ring (905), an upper permanent magnet ring (903) and a lower permanent magnet ring (907), bolts (909) are used for fastening the motor stator assembly, and bolts (908) are used for fastening the motor stator assembly and a stator shell (2).
8. The large-electric-quantity high-power magnetic suspension energy storage flywheel system according to claim 1, characterized in that:
the number of turns of an electric excitation winding (904) which is circumferentially coiled on the stator of the hybrid excitation homopolar inductor motor is 300, the air gap of the stator and the rotor of the hybrid excitation homopolar inductor motor generator is 4mm, and the axial thickness of a permanent magnet ring is 40 mm.
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| GB2610527A (en) * | 2022-01-04 | 2023-03-08 | Univ Jiangsu | Structure self-adjusting type vehicle-mounted flywheel battery coping with multiple operation modes and operating method thereof |
| CN115811174A (en) * | 2023-02-10 | 2023-03-17 | 山东天瑞重工有限公司 | Magnetic suspension flywheel energy storage battery |
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| CN211958962U (en) * | 2020-05-26 | 2020-11-17 | 华驰动能(北京)科技有限公司 | High-power magnetic suspension energy storage flywheel system with large electric quantity |
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| CN115811174B (en) * | 2023-02-10 | 2023-04-18 | 山东天瑞重工有限公司 | Magnetic suspension flywheel energy storage battery |
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| CN111463956B (en) | 2024-06-25 |
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