Flywheel energy storage system

Abstract

The application relates to a flywheel energy storage system, which comprises a shell, an installation cavity is formed in the inside of the shell, a magnetic drive module is arranged on the side wall of the installation cavity, a flywheel rotor is arranged in the installation cavity, the flywheel rotor is driven in cooperation with the magnetic drive module, so that the flywheel rotor can rotate in the installation cavity, a magnetic suspension module is connected between the lower portion of the flywheel rotor and the side wall of the installation cavity, and is used for realizing the suspension installation of the flywheel rotor, and at least two magnetic bearings are arranged on the side wall of the installation cavity in a spaced mode and surround the outer periphery of the flywheel rotor. The flywheel energy storage system has the advantages of simple structural composition, compact and reasonable layout, low processing and manufacturing difficulty and high working reliability.

Description

Technical Field

[0001] This application relates to the technical field of energy storage devices, and in particular to a flywheel energy storage system. Background Technology

[0002] A flywheel energy storage system is an electromechanical energy conversion energy storage device. It stores energy in the form of mechanical kinetic energy through a high-speed rotating flywheel and uses a bidirectional electric / generator reversible motor to achieve the mutual conversion between electrical energy and kinetic energy. Its core working principle is: in the energy storage stage, electrical energy drives the motor to accelerate the rotation of the flywheel, converting electrical energy into kinetic energy for storage; in the energy release stage, the flywheel drives the motor to generate electricity, converting kinetic energy back into electrical energy for output.

[0003] In related technologies, the mechanical bearings used in flywheel energy storage systems suffer from significant mechanical friction losses, reducing the energy conversion efficiency of the system. Furthermore, the friction losses generate substantial heat, shortening the system's lifespan. To address the problems associated with mechanical bearings in existing flywheel energy storage systems, some systems have adopted magnetic levitation bearings. However, existing flywheel energy storage systems using magnetic levitation bearings are mostly structurally complex, require high-precision manufacturing processes, and suffer from low operational reliability. Summary of the Invention

[0004] Therefore, it is necessary to provide a flywheel energy storage system to address the problems of complex structure, high processing and manufacturing requirements, and low operational reliability of traditional technologies.

[0005] This application proposes a flywheel energy storage system, which includes:

[0006] A housing, wherein an installation cavity is formed inside the housing;

[0007] A magnetic drive module, wherein the magnetic drive module is disposed on the side wall of the mounting cavity;

[0008] A flywheel rotor is installed in the mounting cavity and is driven by the magnetic drive module so that the flywheel rotor can rotate in the mounting cavity;

[0009] A magnetic levitation module, connected between the lower part of the flywheel rotor and the side wall of the mounting cavity, is used to achieve levitation mounting of the flywheel rotor; and

[0010] At least two magnetic bearings are installed at intervals on the sidewall of the mounting cavity and surround the outer periphery of the flywheel rotor.

[0011] In this flywheel energy storage system, a magnetic drive module, a flywheel rotor, a magnetic levitation module, and at least two magnetic bearings are respectively installed at designated positions within the mounting cavity of the housing. This allows the magnetic levitation module to generate magnetic levitation force, enabling the flywheel rotor to levitate along the Z-axis within the mounting cavity, and also constrains the flywheel rotor's translational motion along the Z-axis. Furthermore, when the magnetic drive module is energized, it generates a rotating magnetic field that drives the flywheel rotor to rotate at high speed, enabling the flywheel rotor to convert and store electrical energy into mechanical energy. During this process, the at least two magnetic bearings surrounding the flywheel rotor, through reasonable air gap magnetic flux control, not only constrain the flywheel rotor's translational motion in the XY-axis plane but also its rotational motion in the XY-axis plane. This achieves non-contact rotational support for the flywheel rotor, effectively preventing mechanical friction and wear, and ensuring the energy conversion efficiency and service life of the flywheel energy storage system. Compared to existing technologies, this flywheel energy storage system has a simple structure, compact and reasonable layout, low manufacturing difficulty, and high operational reliability.

[0012] The technical solution of this application will be further described below:

[0013] In one embodiment, a positioning groove is recessed in the side wall of the mounting cavity, the magnetic bearing is installed in the positioning groove, and a portion of the magnetic bearing protrudes outside the opening of the positioning groove, so that the flywheel rotor is in clearance fit with the side wall of the mounting cavity.

[0014] In one embodiment, the magnetic bearing includes a first magnetic component and a second magnetic component, which are arranged at intervals along the width direction of the positioning groove. The first magnetic component is used to constrain the flywheel rotor to translate in the XY-axis plane, and the second magnetic component is used to constrain the flywheel rotor to rotate in the XY-axis plane.

[0015] In one embodiment, both the first magnetic assembly and the second magnetic assembly include a magnetic bearing stator and a magnetic bearing winding, the magnetic bearing winding being wound around the outside of the magnetic bearing stator.

[0016] In one embodiment, the magnetic bearing further includes a permanent magnet disposed in the space between the first magnetic component and the second magnetic component.

[0017] In one embodiment, the flywheel energy storage system includes multiple magnetic bearings, multiple magnetic rings, and multiple positioning slots. The multiple positioning slots are formed at intervals along the circumferential direction on the side wall of the mounting cavity. The magnetic bearings are installed in the positioning slots one by one, and a magnetic ring is connected between two adjacent magnetic bearings.

[0018] In one embodiment, the magnetic levitation module includes an upper magnetic levitation permanent magnet, a lower magnetic levitation permanent magnet, and a fixed ring. The fixed ring is fixedly installed at the bottom of the flywheel rotor. The upper magnetic levitation permanent magnet is installed on the inner ring wall of the fixed ring. The lower magnetic levitation permanent magnet is installed on the side wall of the mounting cavity and is axially spaced relative to the upper magnetic levitation permanent magnet.

[0019] In one embodiment, a first opening and a second opening are respectively provided on opposite sides of the housing, and a first flywheel shaft and a second flywheel shaft protrude from opposite sides of the flywheel rotor along their axial directions.

[0020] The first opening is covered with a first end cap, and the second opening is covered with a second end cap. The magnetic drive module includes a first magnetic drive component and a second magnetic drive component. The first magnetic drive component is disposed inside the first end cap and drives and cooperates with the first flywheel shaft. The second magnetic drive component is disposed inside the second end cap and drives and cooperates with the second flywheel shaft.

[0021] In one embodiment, both the first magnetic drive assembly and the second magnetic drive assembly include a magnetic drive stator, a magnetic drive winding, and a magnetic drive permanent magnet. The magnetic drive permanent magnet is fixedly installed on the first flywheel shaft and the second flywheel shaft. The magnetic drive stator is fixedly disposed on the first end cover and the second end cover. The magnetic drive winding is disposed in the gap between the magnetic drive stator and the first end cover and the second end cover.

[0022] In one embodiment, the magnetically driven permanent magnet is externally wrapped with a carbon fiber sheath. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a structural schematic diagram of the energy storage performance of a magnetic levitation flywheel according to one embodiment.

[0026] Figure 2 for Figure 1 A structural diagram from another perspective.

[0027] Figure 3 This is a partial exploded structural diagram of a flywheel energy storage system.

[0028] Figure 4 This is a schematic diagram of the axial cross-sectional structure of a flywheel energy storage system.

[0029] Figure 5 This is a schematic diagram of the axial cross-sectional structure of a flywheel energy storage system from another perspective.

[0030] Figure 6 This is a schematic diagram of the installation structure of the magnetic bearing and the magnetic ring inside the housing.

[0031] Figure 7 This is a schematic diagram of the assembly structure of the magnetic bearing, magnetic ring, and flywheel rotor.

[0032] Figure 8 This is a schematic diagram of the assembly structure of multiple magnetic bearings and multiple magnetic rings.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Flywheel energy storage system; 10. Housing; 11. Mounting cavity; 12. Positioning slot; 20. Magnetic drive module; 21. First magnetic drive assembly; 22. Second magnetic drive assembly; 20a. Magnetic drive stator; 20b. Magnetic drive winding; 20c. Magnetic drive permanent magnet; 30. Flywheel rotor; 31. First flywheel shaft; 32. Second flywheel shaft; 40. Magnetic levitation module; 41. Upper magnetic levitation permanent magnet; 42. Lower magnetic levitation permanent magnet; 43. Fixing ring; 50. Magnetic bearing; 51. First magnetic assembly; 52. Second magnetic assembly; 50a. Magnetic bearing stator; 50b. Magnetic bearing winding; 50c. Magnetic bearing permanent magnet; 60. Magnetic guide ring; 70. First end cap; 80. Second end cap; 90. Carbon fiber sheath. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] See Figures 1 to 8 This application illustrates a flywheel energy storage system 100 according to an embodiment, which includes a housing 10, a magnetic drive module 20, a flywheel rotor 30, a magnetic levitation module 40, and at least two magnetic bearings 50. The housing 10 is the main component of the flywheel energy storage system 100, serving to house and integrate the magnetic drive module 20, the flywheel rotor 30, the magnetic levitation module 40, and the at least two magnetic bearings 50.

[0042] For example, in this application, the shell 10 is made of stainless steel and has a flat cylindrical structure, which is easy to manufacture, has high strength, and good durability.

[0043] Please continue reading. Figure 4 The housing 10 has an internal mounting cavity 11; a magnetic drive module 20 is mounted on the side wall of the mounting cavity 11; a flywheel rotor 30 is mounted in the mounting cavity 11 and drives the flywheel rotor 30 in conjunction with the magnetic drive module 20 so that the flywheel rotor 30 can rotate in the mounting cavity 11; a magnetic levitation module 40 is connected between the lower part of the flywheel rotor 30 and the side wall of the mounting cavity 11 to achieve the levitation mounting of the flywheel rotor 30; at least two magnetic bearings 50 are mounted on the side wall of the mounting cavity 11 at intervals and are arranged around the outer periphery of the flywheel rotor 30.

[0044] In summary, implementing the technical solution of this embodiment will achieve the following beneficial effects: In the flywheel energy storage system 100 of this solution, the magnetic drive module 20, the flywheel rotor 30, the magnetic levitation module 40, and at least two magnetic bearings 50 are respectively installed in the mounting cavity 11 of the housing 10 at predetermined positions. This allows the magnetic levitation module 40 to generate magnetic levitation force, enabling the flywheel rotor 30 to be suspended and installed in the mounting cavity 11 along the Z-axis direction, and the magnetic levitation module 40 to constrain the translational motion of the flywheel rotor 30 along the Z-axis direction. On the other hand, the magnetic drive module 20 generates a rotating magnetic field after being energized, which can drive the flywheel rotor 30 to rotate at high speed, realizing the flywheel rotation... The flywheel rotor 30 converts and stores electrical energy into mechanical energy. During this process, at least two magnetic bearings 50 installed around the outer periphery of the flywheel rotor 30, through reasonable air gap magnetic flux control, can not only constrain the flywheel rotor 30 to produce translational motion in the XY-axis plane, but also constrain the flywheel rotor 30 to produce rotation in the XY-axis plane. This achieves non-contact rotational support for the flywheel rotor 30, which can effectively prevent mechanical friction and wear, and ensure the energy conversion efficiency and service life of the flywheel energy storage system. Moreover, compared with the prior art, the flywheel energy storage system 100 of this solution has a simple structure, compact and reasonable layout, low processing and manufacturing difficulty, and high operational reliability.

[0045] Based on the above embodiments, in one embodiment, the side wall of the mounting cavity 11 is recessed to form a positioning groove 12, the magnetic bearing 50 is installed in the positioning groove 12, and part of the magnetic bearing 50 protrudes outside the groove opening of the positioning groove 12 so that the flywheel rotor 30 is clearance-fitted with the side wall of the mounting cavity 11.

[0046] By mounting the magnetic bearing 50 in the positioning groove 12, it is not only convenient to install and arrange the magnetic bearing 50, but also the magnetic bearing 50 can be installed more stably. At the same time, the magnetic bearing 50 only extends into the mounting cavity 11. On the one hand, it avoids occupying too much space in the mounting cavity 11 and increasing the difficulty of arranging the flywheel rotor 30. On the other hand, the magnetic bearing 50 can limit the position of the flywheel rotor 30 in the XY plane in the mounting cavity 11, so that the flywheel rotor 30 can be arranged with a gap with the side wall of the mounting cavity 11, avoiding contact friction wear when the flywheel rotor 30 rotates, which would affect the rotation efficiency and service life of the flywheel rotor 30.

[0047] Optionally, the magnetic bearing 50 can be fixed in the positioning groove 12 by any of the following methods: interference fit, bonding, snap-fit, etc. The specific method can be flexibly selected according to actual needs, and no specific limitation is made here.

[0048] More specifically, in an optional embodiment, the magnetic bearing 50 includes a first magnetic component 51 and a second magnetic component 52, which are arranged at intervals along the width direction of the positioning groove 12. The first magnetic component 51 is used to constrain the flywheel rotor 30 to translate in the XY axis plane, and the second magnetic component 52 is used to constrain the flywheel rotor 30 to rotate in the XY axis plane.

[0049] In other words, the magnetic bearing 50 of this application is actually a hybrid magnetic bearing 50. During operation, by controlling the air gap magnetic flux of the first magnetic component 51, the flywheel rotor 30 can be constrained to translate in the XY axis plane; by controlling the air gap magnetic flux of the second magnetic component 52, the flywheel rotor 30 can be constrained to rotate in the XY axis plane, thereby achieving a good non-contact support and positioning effect of the magnetic bearing 50 for the flywheel rotor 30.

[0050] Please continue reading. Figure 4 , Figure 7 and Figure 8 Specifically, based on the above embodiments, both the first magnetic component 51 and the second magnetic component 52 include a magnetic bearing stator 50a and a magnetic bearing winding 50b, with the magnetic bearing winding 50b wound around the outside of the magnetic bearing stator 50a.

[0051] The magnetic bearing stator 50a serves as the fixed part of the magnetic bearing 50. By means of the wound magnetic bearing winding 50b, a controllable magnetic field force can be generated to directly apply magnetic attraction or repulsion to the flywheel rotor 30, thereby maintaining the flywheel rotor 30 suspended in a predetermined position. The magnetic bearing stator 50a also forms an air gap with the flywheel rotor 30 to ensure no mechanical contact.

[0052] Furthermore, based on the above embodiments, the magnetic bearing 50 also includes a permanent magnet 50c, which is disposed in the gap between the first magnetic assembly 51 and the second magnetic assembly 52. ​​The permanent magnet 50c is mainly used to provide a static bias magnetic field to bear most of the weight or initial magnetic force requirements of the flywheel rotor 30. This significantly reduces the power consumption of the electromagnetic coil and the ampere-turns of the electromagnet, thereby optimizing system efficiency and size. Specifically, in the hybrid magnetic bearing 50, the permanent magnet 50c works in conjunction with the magnetic bearing winding 50b (i.e., the electromagnetic coil). The permanent magnet establishes the basic magnetic field, while the magnetic bearing winding 50b achieves dynamic balance by rapidly adjusting the current, improving levitation stability and response speed.

[0053] Please continue reading. Figures 6 to 8Optionally, in one embodiment of this application, the flywheel energy storage system 100 includes a plurality of magnetic bearings 50, a plurality of magnetic rings 60 and a plurality of positioning grooves 12. The plurality of positioning grooves 12 are formed at intervals along the circumferential direction on the side wall of the mounting cavity 11. The magnetic bearings 50 are installed in the positioning grooves 12 one by one, and a magnetic ring 60 is connected between two adjacent magnetic bearings 50.

[0054] Specifically, four magnetic bearings 50 and four magnetic rings 60 are provided, and the four magnetic bearings 50 and four magnetic rings 60 are alternately connected to form a closed ring structure; that is, the four magnetic bearings 50 and four magnetic rings 60 are arranged in a cross shape, which can be adapted to the cross shape structure of the flywheel rotor 30, thereby giving full play to the magnetic levitation support of the four magnetic bearings 50, ensuring that the flywheel rotor 30 is subjected to balanced circumferential force, and thus ensuring that the flywheel rotor 30 has a stable posture when rotating at high speed and avoiding contact friction with the housing 10.

[0055] The magnetic ring 60 placed between two adjacent magnetic bearings 50 can create a more stable magnetic field circuit, allowing the magnetic lines of force to be concentrated efficiently, thereby generating sufficient levitation force. At the same time, it can also shield external magnetic field interference, ensuring the stable operation of the magnetic bearing 50.

[0056] Please continue reading. Figure 4 In another embodiment, the magnetic levitation module 40 includes an upper magnetic levitation permanent magnet 41, a lower magnetic levitation permanent magnet 42, and a fixing ring 43. The fixing ring 43 is fixedly installed on the bottom of the flywheel rotor 30. The upper magnetic levitation permanent magnet 41 is installed on the inner ring wall of the fixing ring 43. The lower magnetic levitation permanent magnet 42 is installed on the side wall of the mounting cavity 11 and is axially spaced relative to the upper magnetic levitation permanent magnet 41.

[0057] During operation, the interaction between the upper magnetic levitation permanent magnet 41 and the lower magnetic levitation permanent magnet 42 generates a repulsive force to overcome the gravity of the flywheel rotor 30, thereby enabling the flywheel rotor 30 to be suspended within the mounting cavity 11. Furthermore, the upper magnetic levitation permanent magnet 41 and the lower magnetic levitation permanent magnet 42 provide a stable magnetic field, and the electromagnetic force is dynamically adjusted by a control system (such as a PID algorithm) to ensure that the levitation body remains in balance.

[0058] In one embodiment, the housing 10 has a first opening and a second opening on opposite sides, and the flywheel rotor 30 has a first flywheel shaft 31 and a second flywheel shaft 32 protruding from opposite sides along its axial direction.

[0059] Please continue reading. Figure 4The outer cover of the first opening is fitted with a first end cap 70, and the outer cover of the second opening is fitted with a second end cap 80. The magnetic drive module 20 includes a first magnetic drive component 21 and a second magnetic drive component 22. The first magnetic drive component 21 is disposed inside the first end cap 70 and drives and cooperates with the first flywheel shaft 31. The second magnetic drive component 22 is disposed inside the second end cap 80 and drives and cooperates with the second flywheel shaft 32.

[0060] Therefore, when the first magnetic drive component 21 and the second magnetic drive component 22 are energized during operation, a rotating magnetic field can be generated to drive the first flywheel shaft 31 and the second flywheel shaft 32 to rotate, thereby driving the flywheel rotor 30 to rotate at high speed, so as to convert electrical energy into mechanical energy for storage.

[0061] Specifically, both the first magnetic drive assembly 21 and the second magnetic drive assembly 22 include a magnetic drive stator 20a, a magnetic drive winding 20b, and a magnetic drive permanent magnet 20c. The magnetic drive permanent magnet 20c is fixedly installed on the first flywheel shaft 31 and the second flywheel shaft 32. The magnetic drive stator 20a is fixedly disposed on the first end cover 70 and the second end cover 80. The magnetic drive winding 20b is disposed in the gap between the magnetic drive stator 20a and the first end cover 70 and the second end cover 80.

[0062] When in operation, the magnetic drive winding 20b generates a controllable rotating magnetic field after being energized. The rotating magnetic field interacts with the magnetic field of the permanent magnet to generate a driving torque, which in turn drives the flywheel rotor 30 to rotate faster, converting electrical energy into mechanical energy for storage.

[0063] Furthermore, the magnetically driven permanent magnet 20c is externally wrapped with a carbon fiber sheath 90. The lightweight and high-strength properties of the carbon fiber sheath 90 protect the magnetically driven permanent magnet 20c from high-speed centrifugal force, high temperature, and damage from the external environment, while simultaneously improving the working efficiency of the first magnetic drive assembly 21 and the second magnetic drive assembly 22.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A flywheel energy storage system, characterized in that, include: A housing, wherein an installation cavity is formed inside the housing; A magnetic drive module, wherein the magnetic drive module is disposed on the side wall of the mounting cavity; A flywheel rotor is installed in the mounting cavity and is driven by the magnetic drive module so that the flywheel rotor can rotate in the mounting cavity; A magnetic levitation module is connected between the lower part of the flywheel rotor and the side wall of the mounting cavity to achieve levitation mounting of the flywheel rotor; as well as At least two magnetic bearings are installed at intervals on the side wall of the mounting cavity and are arranged around the outer periphery of the flywheel rotor; The side wall of the mounting cavity is recessed to form a positioning groove, the magnetic bearing is installed in the positioning groove, and part of the magnetic bearing protrudes outside the groove opening of the positioning groove so that the flywheel rotor is in clearance fit with the side wall of the mounting cavity. The magnetic bearing includes a first magnetic component and a second magnetic component, which are arranged at intervals along the width direction of the positioning groove. The first magnetic component is used to constrain the translational motion of the flywheel rotor in the XY-axis plane, and the second magnetic component is used to constrain the rotational motion of the flywheel rotor in the XY-axis plane. The flywheel energy storage system includes multiple magnetic bearings, multiple magnetic rings, and multiple positioning slots. The multiple positioning slots are formed at intervals along the circumferential direction on the side wall of the mounting cavity. The magnetic bearings are installed in the positioning slots one by one, and a magnetic ring is connected between two adjacent magnetic bearings.

2. The flywheel energy storage system according to claim 1, characterized in that, Both the first magnetic assembly and the second magnetic assembly include a magnetic bearing stator and a magnetic bearing winding, wherein the magnetic bearing winding is wound around the outside of the magnetic bearing stator.

3. The flywheel energy storage system according to claim 1, characterized in that, The magnetic bearing further includes a permanent magnet, which is disposed in the gap between the first magnetic component and the second magnetic component.

4. The flywheel energy storage system according to claim 1, characterized in that, The magnetic levitation module includes an upper magnetic levitation permanent magnet, a lower magnetic levitation permanent magnet, and a fixed ring. The fixed ring is fixedly installed at the bottom of the flywheel rotor. The upper magnetic levitation permanent magnet is installed on the inner ring wall of the fixed ring. The lower magnetic levitation permanent magnet is installed on the side wall of the mounting cavity and is axially spaced relative to the upper magnetic levitation permanent magnet.

5. The flywheel energy storage system according to claim 1, characterized in that, The housing has a first opening and a second opening on opposite sides, and the flywheel rotor has a first flywheel shaft and a second flywheel shaft protruding from opposite sides along its axial direction. The first opening is covered with a first end cap, and the second opening is covered with a second end cap. The magnetic drive module includes a first magnetic drive component and a second magnetic drive component. The first magnetic drive component is disposed inside the first end cap and drives and cooperates with the first flywheel shaft. The second magnetic drive component is disposed inside the second end cap and drives and cooperates with the second flywheel shaft.

6. The flywheel energy storage system according to claim 5, characterized in that, Both the first magnetic drive assembly and the second magnetic drive assembly include a magnetic drive stator, a magnetic drive winding, and a magnetic drive permanent magnet. The magnetic drive permanent magnet is fixedly installed on the first flywheel shaft and the second flywheel shaft. The magnetic drive stator is fixedly disposed on the first end cover and the second end cover. The magnetic drive winding is disposed in the gap between the magnetic drive stator and the first end cover and the second end cover.

7. The flywheel energy storage system according to claim 6, characterized in that, The magnetically driven permanent magnet is externally wrapped with a carbon fiber sheath.

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