Magnetic suspension flywheel energy storage device

Abstract

The invention discloses a magnetic suspension flywheel energy storage device which comprises a shell, a flywheel disc rotor assembly, a permanent magnet synchronous motor assembly, a radial magnetic suspension bearing system, an axial magnetic suspension bearing system and a vacuum operation system. The motor rotor is arranged on the flywheel disc rotor assembly; the radial magnetic suspension bearing system and the axial magnetic suspension bearing system are used for supporting the flywheel disc rotor assembly; the vacuum operation system is used for vacuumizing the inner cavity of the shell; and the cooling system is used for cooling the motor stator. When the permanent magnet synchronous motor assembly drives the flywheel disc rotor assembly to operate, the flywheel disc rotor assembly is in a suspension state, meanwhile, friction damage of the flywheel disc rotor assembly during operation can be reduced through the vacuum environment, and the energy storage efficiency can be effectively improved. The cooling system is used for cooling the motor stator with high heat productivity, so that stable operation of the motor stator can be effectively guaranteed, and reliable operation of the energy storage device is further guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a magnetic levitation flywheel energy storage device. Background Art

[0002] Flywheel energy storage refers to a storage method that uses an electric motor to drive the flywheel to rotate, and then uses the flywheel to drive a generator to generate electricity when needed. The magnetic levitation flywheel energy storage device is an energy storage device that applies magnetic levitation technology to flywheel energy storage, which can effectively reduce the friction loss of the flywheel rotor.

[0003] With the development of new energy power generation, distributed power systems, uninterruptible power supplies, new power vehicles and other fields, the requirements for energy storage are becoming increasingly higher. The mass of flywheel rotors has been greatly improved, and the rotor speed has also increased. Therefore, how to provide a magnetic levitation flywheel energy storage device with large load capacity and high power is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a magnetic levitation flywheel energy storage device that can effectively reduce friction loss and thereby improve energy storage efficiency.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A magnetic levitation flywheel energy storage device, comprising:

[0007] shell;

[0008] a flywheel disc rotor assembly, disposed within the housing;

[0009] A permanent magnet synchronous motor assembly, comprising a motor stator and a motor rotor, wherein the motor stator is arranged in the housing, and the motor rotor is arranged in the flywheel disc rotor assembly;

[0010] a radial magnetic bearing system and an axial magnetic bearing system for supporting the flywheel disc rotor assembly;

[0011] a vacuum operation system for evacuating the inner cavity of the housing;

[0012] A cooling system is used to cool the motor stator.

[0013] In some embodiments, the flywheel disc rotor assembly includes a core shaft, a flywheel disc rotor, a lower radial measured ring, a lower radial magnetic bearing rotor, an upper radial magnetic bearing rotor, an upper radial measured ring and a resolver rotor, the flywheel disc rotor is arranged on the core shaft, the motor rotor is arranged on the core shaft and is located above the flywheel disc rotor; the lower radial magnetic bearing rotor is arranged on the core shaft and is located above the flywheel disc rotor, the lower radial measured ring is arranged on the core shaft and is located below the lower radial magnetic bearing rotor; the lower radial magnetic bearing rotor is arranged on the core shaft and is located below the flywheel disc rotor, the upper radial measured ring is arranged on the core shaft and is located above the upper radial magnetic bearing rotor; the resolver rotor is arranged at the top of the core shaft.

[0014] In some embodiments, the radial magnetic bearing system includes an upper radial magnetic bearing assembly located above the flywheel disc rotor and a lower radial magnetic bearing assembly located below the flywheel disc rotor, and the motor rotor is located between the upper radial magnetic bearing assembly and the flywheel disc rotor.

[0015] In some embodiments, the upper radial magnetic bearing assembly and the lower radial magnetic bearing assembly both include a radial magnetic bearing housing, a radial magnetic bearing coil, a radial magnetic bearing locking piece, a radial magnetic bearing protective bearing, a radial magnetic bearing stator core, a radial magnetic bearing stator fixed base and a radial magnetic bearing stator end cover. The radial magnetic bearing housing is arranged in the outer shell, the radial magnetic bearing stator fixed base is arranged on the radial magnetic bearing housing, the radial magnetic bearing coil is arranged on the radial magnetic bearing stator core, the radial magnetic bearing stator core is fixed on the radial magnetic bearing stator fixed base, the radial magnetic bearing stator end cover is fixed to the radial magnetic bearing housing through the radial magnetic bearing locking piece to limit the axial position of the radial magnetic bearing stator, the radial magnetic bearing protective bearing is arranged at one end of the radial magnetic bearing housing, and the core shaft is passed through the radial magnetic bearing protective bearing.

[0016] In some embodiments, the axial magnetic bearing system includes an upper axial magnetic bearing assembly and a lower axial magnetic bearing assembly, the upper axial magnetic bearing assembly is located above the flywheel disc rotor, the upper radial magnetic bearing assembly is located above the upper axial magnetic bearing assembly, and the motor rotor is located between the upper radial magnetic bearing assembly and the upper axial magnetic bearing assembly; the lower axial magnetic bearing assembly is located below the flywheel disc rotor and above the lower radial magnetic bearing assembly.

[0017] In some embodiments, the upper axial magnetic bearing assembly and the lower axial magnetic bearing assembly both include an axial magnetic bearing mounting seat, an axial magnetic bearing stator, an axial magnetic bearing coil and an axial magnetic bearing fastener. The axial magnetic bearing mounting seat is fixed in the outer shell, the axial magnetic bearing stator is connected to the axial magnetic bearing mounting seat through an axial magnetic bearing fastener, and the axial magnetic bearing coil is arranged on the axial magnetic bearing stator.

[0018] In some embodiments, the outer shell includes an upper shell and a lower shell, the lower end of the upper shell is connected to the upper end of the lower shell, the inner cavities of the upper shell and the lower shell are interconnected, the motor stator and the upper radial magnetic bearing assembly are located in the upper shell; the flywheel disc rotor, the upper axial magnetic bearing assembly, the lower axial magnetic bearing assembly and the lower radial magnetic bearing assembly are located in the lower shell.

[0019] In some embodiments, a flange is provided on the outer periphery of the bottom of the lower shell, a lower hanging ring is provided on the flange, and an upper hanging ring is provided on the top of the upper shell.

[0020] In some embodiments, the vacuum operation system includes a vacuum gauge and a vacuum valve provided on the housing, the vacuum valve is used to connect to a vacuum pump, and the vacuum gauge is used to detect the vacuum degree in the housing.

[0021] In some embodiments, the cooling system includes a circulating water cooling channel provided inside the side wall of the shell.

[0022] Compared with the existing technology, the above technical solution has at least the following advantages:

[0023] The present invention provides a magnetic levitation flywheel energy storage device, comprising: a housing, a flywheel disc rotor assembly, a permanent magnet synchronous motor assembly, a radial magnetic levitation bearing system, an axial magnetic levitation bearing system, and a vacuum operation system, wherein the permanent magnet synchronous motor assembly comprises a motor stator and a motor rotor, the motor stator is arranged in the housing, and the motor rotor is arranged in the flywheel disc rotor assembly; the radial magnetic levitation bearing system and the axial magnetic levitation bearing system are used to support the flywheel disc rotor assembly; the vacuum operation system is used to evacuate the inner cavity of the housing; and the cooling system is used to cool the motor stator. When the permanent magnet synchronous motor assembly drives the flywheel disc rotor assembly to operate, the flywheel disc rotor assembly is in a suspended state. At the same time, the vacuum environment can be used to further reduce the friction damage of the flywheel disc rotor assembly during operation, which can effectively improve the energy storage efficiency. By cooling the motor stator with high heat generation through the cooling system, its stable operation can be effectively guaranteed, thereby ensuring the reliable operation of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the internal structure of a magnetic levitation flywheel energy storage device provided in a specific embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the external structure of a magnetic levitation flywheel energy storage device provided in a specific embodiment of the present invention;

[0027] Figure 3 for Figure 1 Schematic diagram of the structure of the magnetic levitation flywheel rotor;

[0028] Figure 4 for Figure 3 Schematic diagram of the structure of the flywheel rotor;

[0029] Figure 5 for Figure 2 Schematic diagram of the structure of the upper shell;

[0030] Figure 6 for Figure 2 Schematic diagram of the structure of the lower shell;

[0031] Figure 7 for Figure 1 A schematic structural diagram of the upper radial magnetic bearing assembly;

[0032] Figure 8 for Figure 1 A schematic structural diagram of the lower radial magnetic bearing assembly;

[0033] Figure 9 for Figure 1 Schematic diagram of the structure of the motor stator;

[0034] Figure 10 for Figure 1 A schematic structural diagram of the upper axial magnetic bearing assembly;

[0035] Figure 11 for Figure 1 Schematic diagram of the structure of the lower axial magnetic bearing assembly.

[0036] The reference numerals are as follows:

[0037] 1-rotating transformer, 2-upper protective bearing, 3-upper radial sensor assembly, 4-upper radial magnetic bearing, 5-motor stator, 6-upper axial magnetic bearing assembly, 7-lower axial magnetic bearing assembly, 8-lower radial magnetic bearing assembly, 9-lower radial sensor assembly, 10-lower protective bearing, 11-first axial sensor, 12-second axial sensor, 13-flywheel rotor, 14-base tripod, 15-lower lifting ring, 16-vacuum gauge, 17-vacuum valve, 18-housing, 19-lower radial measured ring, 20-lower radial magnetic bearing rotor, 21-motor rotor, 22-upper radial magnetic bearing rotor, 23-upper radial Measuring ring, 24-resolver rotor, 25-upper rotor support seat, 26-upper shell, 27-lower rotor support seat, 28-lower shell, 29-radial magnetic bearing housing, 30-radial magnetic bearing coil, 31-radial magnetic bearing locking piece, 32-radial magnetic bearing protection bearing, 33-radial magnetic bearing stator core, 34-radial magnetic bearing stator fixed base, 35-radial magnetic bearing stator end cover 36-motor stator coil, 37-motor stator core, 38-motor stator mounting seat, 39-axial magnetic bearing mounting seat, 40-axial magnetic bearing fastener, 41-axial magnetic bearing stator, 42-axial magnetic bearing coil. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Please refer to Figures 1 to 10A magnetic levitation flywheel energy storage device provided in an embodiment of the present invention is a five-degree-of-freedom magnetic levitation flywheel energy storage device that can meet the requirements of large load and high power, wherein the magnetic levitation flywheel energy storage device includes: a shell 18, a flywheel disc rotor assembly, a permanent magnet synchronous motor assembly, a radial magnetic levitation bearing system, an axial magnetic levitation bearing system, a vacuum operation system and a cooling system, wherein the flywheel disc rotor assembly is arranged in the shell 18; the permanent magnet synchronous motor assembly includes a motor stator 5 and a motor rotor 21, the motor stator 5 is arranged in the shell 18, and the motor rotor 21 is arranged in the flywheel disc rotor assembly, and the motor rotor 21 mainly works together with the motor stator 5 to drive the acceleration and deceleration of the flywheel disc rotor assembly, thereby realizing the charging and discharging function of the energy storage device; the radial magnetic levitation bearing system and the axial magnetic levitation bearing system are arranged in the shell 18 for supporting the flywheel disc rotor assembly; the vacuum operation system is used to evacuate the inner cavity of the shell 18 to reduce the friction loss of the flywheel disc rotor assembly; and the cooling system is used to cool the motor stator 5. When the permanent magnet synchronous motor assembly drives the flywheel rotor assembly, it remains suspended. The vacuum environment further reduces frictional damage to the flywheel rotor assembly during operation, effectively improving energy storage efficiency. Cooling the motor stator 5, which generates high heat, through the cooling system ensures stable operation and, consequently, reliable operation of the energy storage device.

[0040] In some embodiments, as Figure 1 、 Figure 3 and Figure 4As shown, the flywheel disc rotor assembly includes a core shaft, a flywheel disc rotor 13, a lower radial measured ring 19, a lower radial magnetic bearing rotor 20, an upper radial magnetic bearing rotor 22, an upper radial measured ring 23 and a resolver rotor 24. The flywheel disc rotor 13 is arranged on the core shaft. The two can be made into an integrated integral structure. The material can be selected from 25Cr2Ni4MoV material. The motor rotor 21 is arranged on the core shaft and is located above the flywheel disc rotor 13; the lower radial magnetic bearing rotor 20 is arranged on the core shaft and is located above the flywheel disc rotor 13. The lower radial measured ring 19 is arranged on the core shaft and is located below the lower radial magnetic bearing rotor 20. The radial position of the lower radial measured ring 19 can be detected by the lower radial sensor assembly 9. The lower radial magnetic bearing rotor 20 is arranged on the core shaft and is located below the flywheel disc rotor 13. The upper radial measured ring 23 is arranged on the core shaft and is located above the upper radial magnetic bearing rotor 22. The radial position of the upper radial measured ring 23 can be detected by the upper radial sensor assembly 3. Therefore, the radial position of the flywheel disc rotor assembly can be detected by the upper radial sensor assembly 3 and the lower radial sensor assembly 9, providing a basis for controlling the radial magnetic bearing assembly. The rotary transformer 1's rotary rotor 24 is arranged at the top of the core shaft. The rotary transformer 24 can rotate synchronously with the core shaft. The rotating stator of the rotary transformer 1 is fixed to the inner top of the housing 18. The rotary transformer 1 can detect the speed of the flywheel disc rotor assembly. Furthermore, an upper protective bearing 2 is provided on the outer periphery of the upper end of the core shaft, and a lower protective bearing 10 is provided on the outer periphery of the lower end of the core shaft.

[0041] In some embodiments, as Figure 1 As shown, the radial magnetic bearing system includes an upper radial magnetic bearing assembly located above the flywheel rotor 13 and a lower radial magnetic bearing assembly 8 located below the flywheel rotor 13. The rotors of the upper and lower radial magnetic bearing assemblies 8 are primarily iron cores formed by laminating silicon steel sheets. When a stator with a magnetic pole in a certain direction is energized to become an electromagnet, it attracts the rotor core to move in a directional direction toward that pole. By dynamically adjusting the stator current in the four directions of the radial magnetic bearing assembly, the rotor can be dynamically and stably suspended near a preset axial position. The motor rotor 21 is located between the upper radial magnetic bearing assembly and the flywheel rotor 13. By arranging the motor rotor 21 between the upper and lower radial magnetic bearing assemblies 8, the operational stability of the flywheel rotor assembly can be effectively ensured.

[0042] In some embodiments, as Figure 7 and Figure 8As shown, the upper radial magnetic bearing assembly and the lower radial magnetic bearing assembly 8 both include a radial magnetic bearing housing 29, a radial magnetic bearing coil 30, a radial magnetic bearing locking piece 31, a radial magnetic bearing protective bearing 32, a radial magnetic bearing stator core 33, a radial magnetic bearing stator fixed base 34 and a radial magnetic bearing stator end cover 35. The radial magnetic bearing housing 29 is arranged in the outer shell 18, the radial magnetic bearing stator fixed base 34 is arranged on the radial magnetic bearing housing 29, the radial magnetic bearing coil 30 is arranged on the radial magnetic bearing stator core 33, the radial magnetic bearing stator core 33 is fixed on the radial magnetic bearing stator fixed base 34, the radial magnetic bearing stator end cover 35 is fixed to the radial magnetic bearing housing 29 by a radial magnetic bearing locking piece 31 to limit the axial position of the radial magnetic bearing stator. The radial magnetic bearing locking piece 31 is preferably a screw. The radial magnetic bearing protective bearing 32 is arranged at one end of the radial magnetic bearing housing 29, and the core shaft is passed through the radial magnetic bearing protective bearing 32. The motor rotor 21 is arranged on the core shaft and is located between the upper radial magnetic bearing assembly and the flywheel rotor 13. The electronic stator assembly is arranged in the housing 18. Figure 9 As shown, the motor stator 5 assembly includes a motor stator coil 36, a motor stator core 37 and a motor stator mounting base 38. The motor stator mounting base 38 is installed in the housing 18, the motor stator core 37 is installed on the motor stator mounting base 38, and the motor stator coil 36 is provided on the motor stator core 37.

[0043] In some embodiments, as Figure 1 As shown, the flywheel rotor 13 has a vertical structure. The axial magnetic bearing system includes an upper axial magnetic bearing assembly 6 and a lower axial magnetic bearing assembly 7. The upper axial magnetic bearing assembly 6 is located above the flywheel rotor 13, and the upper radial magnetic bearing assembly is located above the upper axial magnetic bearing assembly 6. The motor rotor 21 is located between the upper radial magnetic bearing assembly and the upper axial magnetic bearing assembly 6. The lower axial magnetic bearing assembly 7 is located below the flywheel rotor 13 and above the lower radial magnetic bearing assembly 8. The upper axial magnetic bearing assembly 6 and the lower axial magnetic bearing assembly 7 are located above and below the flywheel rotor, respectively. Because the flywheel rotor 13 is relatively heavy, the magnetic bearings need to provide a large force to resist the gravity of the flywheel rotor 13. By adopting a vertical layout and utilizing the large cross-section of the flywheel rotor 13 as a thrust disk, a smaller current can be used to provide a greater suction force to resist the gravity of the flywheel rotor 13.

[0044] In some embodiments, as Figure 10 and Figure 11As shown, the upper axial magnetic bearing assembly 6 and the lower axial magnetic bearing assembly 7 each include an axial magnetic bearing mounting seat 39, an axial magnetic bearing stator 41, an axial magnetic bearing coil 42, and an axial magnetic bearing fastener 40. The axial magnetic bearing fastener 40 is preferably a screw. The axial magnetic bearing mounting seat 39 is fixed in the housing 18. The axial magnetic bearing stator 41 is connected to the axial magnetic bearing mounting seat 39 via the axial magnetic bearing fastener 40. The axial magnetic bearing coil 42 is provided on the axial magnetic bearing stator 41. The radial magnetic bearing system and the axial magnetic bearing system in the above embodiments are described using active magnetic suspension as an example. Passive magnetic suspension can also be used, for example, by using permanent magnets instead.

[0045] In some embodiments, as Figure 2 、 Figure 5 and Figure 6 As shown, the inner cavity of the housing 18 is a closed cavity. The housing 18 includes an upper shell 26 and a lower shell 28. The lower end of the upper shell 26 is connected to the upper end of the lower shell 28, for example, by a flange. The connection between the two is sealed by a sealing gasket. The inner cavities of the upper shell 26 and the lower shell 28 are connected to each other. The motor stator 5 and the upper radial magnetic bearing assembly are located in the upper shell 26. Figure 5 As shown, an upper rotor support seat 25 is provided in the upper shell 26 for mounting an upper radial magnetic bearing assembly; the flywheel rotor 13, the upper axial magnetic bearing assembly 6, the lower axial magnetic bearing assembly 7 and the lower radial magnetic bearing assembly 8 are located in the lower shell 28, as shown in FIG. Figure 6 As shown, a lower rotor support 27 is provided within the lower housing 28 for mounting the upper axial magnetic bearing assembly 6 and the lower axial magnetic bearing assembly 7. The upper housing 26 has a top cover at the top, and the lower housing 28 has a bottom plate at the bottom, upon which the retaining ring of the lower protective bearing 10 can be mounted. A first axial sensor 11 can be provided on the bottom plate at a position corresponding to the lower end of the core shaft, and a second axial sensor 12 is provided within the lower housing 28 below the flywheel rotor 13. These first and second axial sensors 11, 12 can accurately detect the axial position of the core shaft and the flywheel rotor 13.

[0046] In some embodiments, the outer periphery of the bottom of the lower shell 28 is provided with a flange, the flange is provided with a lower hanging ring 15, and the top of the upper shell 26 is provided with an upper hanging ring. Figure 2As shown, multiple lower lifting rings 15 can be provided on the upper surface of the flange, distributed along the circumference. An upper lifting ring is provided on each side of the top of the upper cover. The upper and lower lifting rings 15 enhance the transport stability of the magnetic levitation flywheel energy storage device. Furthermore, a base support 14 can be provided below the lower shell 28 to level the device and ensure smooth operation. Furthermore, holes for anchor bolts are provided on the flange.

[0047] In some embodiments, the vacuum operation system includes a vacuum gauge 16 and a vacuum valve 17 provided on a housing 18, such as Figure 2 As shown, the vacuum gauge 16 and the vacuum valve 17 are respectively arranged on both sides of the lower shell 28. The vacuum valve 17 is used to connect to the vacuum pump. The vacuum pump is preferably an oil pump vacuum pump with an ultimate pressure less than 10Pa. The vacuum gauge 16 is used to detect the vacuum degree in the shell 18, so as to facilitate real-time monitoring of the vacuum degree in the shell 18.

[0048] In some embodiments, the cooling system includes circulating water cooling channels within the sidewalls of the housing 18, i.e., the sidewalls of the housing 18 are formed into a sandwich structure. Since the inner cavity of the housing 18 is evacuated, heat is not easily dissipated. Therefore, the circulating water cooling channels within the sidewalls of the housing 18 can be used to dissipate heat. The circulating water cooling channels can be provided in the section of the housing 18 corresponding to the motor stator 5. The rotor is constructed from alloy steel, which has good thermal conductivity and can promptly transfer heat generated by the magnets to other parts of the rotor, preventing demagnetization caused by localized overheating of the magnets. Due to the rotor's large mass, its heat capacity is also large, and its large surface area facilitates radiative heat dissipation, allowing the rotor to reach thermal equilibrium at relatively low temperatures. Circulating water cooling channels can also be provided at other locations within the sidewalls of the housing 18. Furthermore, the outer wall of the housing 18 is provided with a water inlet and outlet connector, which can be connected to a circulating pump to circulate water within the sandwich structure of the housing 18.

[0049] It should be noted that, in the above embodiment, the flywheel rotor 13 is described as a vertical type, and can also be designed to be placed horizontally, and the specific selection can be made according to actual needs.

[0050] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] The above is a detailed introduction to a magnetic levitation flywheel energy storage device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A magnetic levitation flywheel energy storage device, characterized in that: include: shell; a flywheel disc rotor assembly, disposed within the housing; A permanent magnet synchronous motor assembly, comprising a motor stator and a motor rotor, wherein the motor stator is arranged in the housing, and the motor rotor is arranged in the flywheel disc rotor assembly; a radial magnetic bearing system and an axial magnetic bearing system for supporting the flywheel disc rotor assembly; a vacuum operation system for evacuating the inner cavity of the housing; A cooling system is used to cool the motor stator.

2. The magnetic levitation flywheel energy storage device according to claim 1, characterized in that: The flywheel disc rotor assembly includes a core shaft, a flywheel disc rotor, a lower radial measured ring, a lower radial magnetic bearing rotor, an upper radial magnetic bearing rotor, an upper radial measured ring and a resolver rotor. The flywheel disc rotor is arranged on the core shaft, and the motor rotor is arranged on the core shaft and located above the flywheel disc rotor; the lower radial magnetic bearing rotor is arranged on the core shaft and located above the flywheel disc rotor, and the lower radial measured ring is arranged on the core shaft and located below the lower radial magnetic bearing rotor; the lower radial magnetic bearing rotor is arranged on the core shaft and located below the flywheel disc rotor, and the upper radial measured ring is arranged on the core shaft and located above the upper radial magnetic bearing rotor; the resolver rotor is arranged at the top of the core shaft.

3. The magnetic levitation flywheel energy storage device according to claim 2, characterized in that: The radial magnetic bearing system includes an upper radial magnetic bearing assembly located above the flywheel rotor and a lower radial magnetic bearing assembly located below the flywheel rotor, and the motor rotor is located between the upper radial magnetic bearing assembly and the flywheel rotor.

4. The magnetic levitation flywheel energy storage device according to claim 3, characterized in that: The upper radial magnetic bearing assembly and the lower radial magnetic bearing assembly both include a radial magnetic bearing housing, a radial magnetic bearing coil, a radial magnetic bearing locking piece, a radial magnetic bearing protection bearing, a radial magnetic bearing stator core, a radial magnetic bearing stator fixed base and a radial magnetic bearing stator end cover. The radial magnetic bearing housing is arranged in the outer shell, the radial magnetic bearing stator fixed base is arranged on the radial magnetic bearing housing, the radial magnetic bearing coil is arranged on the radial magnetic bearing stator core, the radial magnetic bearing stator core is fixed on the radial magnetic bearing stator fixed base, the radial magnetic bearing stator end cover is fixed to the radial magnetic bearing housing by the radial magnetic bearing locking piece to limit the axial position of the radial magnetic bearing stator, the radial magnetic bearing protection bearing is arranged at one end of the radial magnetic bearing housing, and the core shaft is passed through the radial magnetic bearing protection bearing.

5. The magnetic levitation flywheel energy storage device according to claim 3, characterized in that: The axial magnetic bearing system includes an upper axial magnetic bearing assembly and a lower axial magnetic bearing assembly. The upper axial magnetic bearing assembly is located above the flywheel disc rotor, the upper radial magnetic bearing assembly is located above the upper axial magnetic bearing assembly, and the motor rotor is located between the upper radial magnetic bearing assembly and the upper axial magnetic bearing assembly; the lower axial magnetic bearing assembly is located below the flywheel disc rotor and above the lower radial magnetic bearing assembly.

6. The magnetic levitation flywheel energy storage device according to claim 5, characterized in that: The upper axial magnetic bearing assembly and the lower axial magnetic bearing assembly both include an axial magnetic bearing mounting seat, an axial magnetic bearing stator, an axial magnetic bearing coil and an axial magnetic bearing fastener. The axial magnetic bearing mounting seat is fixed in the outer shell, the axial magnetic bearing stator is connected to the axial magnetic bearing mounting seat through an axial magnetic bearing fastener, and the axial magnetic bearing coil is arranged on the axial magnetic bearing stator.

7. The magnetic levitation flywheel energy storage device according to claim 6, characterized in that: The outer shell includes an upper shell and a lower shell, the lower end of the upper shell is connected to the upper end of the lower shell, the inner cavities of the upper shell and the lower shell are connected to each other, the motor stator and the upper radial magnetic bearing assembly are located in the upper shell; the flywheel rotor, the upper axial magnetic bearing assembly, the lower axial magnetic bearing assembly and the lower radial magnetic bearing assembly are located in the lower shell.

8. The magnetic levitation flywheel energy storage device according to claim 7, characterized in that: A flange is provided on the outer periphery of the bottom of the lower shell, a lower hanging ring is provided on the flange, and an upper hanging ring is provided on the top of the upper shell.

9. The magnetic levitation flywheel energy storage device according to any one of claims 1 to 8, characterized in that: The vacuum operation system includes a vacuum gauge and a vacuum valve provided on the housing. The vacuum valve is used to be connected to a vacuum pump, and the vacuum gauge is used to detect the vacuum degree in the housing.

10. The magnetic levitation flywheel energy storage device according to any one of claims 1 to 8, characterized in that: The cooling system includes a circulating water cooling channel arranged inside the side wall of the shell.

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