Flywheel energy storage system

Abstract

The invention relates to a flywheel energy storage system, which comprises a shell, a flywheel, an energy storage module and a control module, the magnetic driving module is arranged on the side wall of the mounting cavity; the flywheel rotor is mounted in the mounting cavity, and the flywheel rotor is in driving fit with the magnetic driving module, so that the flywheel rotor can rotate in the mounting cavity; the magnetic suspension module is connected between the lower part of the flywheel rotor and the side wall of the mounting cavity and is used for realizing suspension mounting of the flywheel rotor; and the at least two magnetic bearings are arranged on the side wall of the mounting cavity in a spaced manner and are arranged on the periphery of the flywheel rotor in a surrounding manner. The flywheel energy storage system is simple in structural composition, compact and reasonable in layout, low in machining and manufacturing difficulty and high in working reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, and particularly relates to a flywheel energy storage system. BACKGROUND

[0002] The flywheel energy storage system is a mechanical and electrical energy conversion energy storage device. The flywheel energy storage system stores energy in the form of mechanical kinetic energy through a high-speed rotating flywheel, and realizes mutual conversion between electrical energy and kinetic energy by using a motor / generator bidirectional motor. The core working principle is that in the energy storage stage, the motor is driven by electrical energy to accelerate the rotation of the flywheel, and the electrical energy is converted into kinetic energy for storage; in the energy release stage, the flywheel drives the motor to generate electricity, and the kinetic energy is converted back into electrical energy for output.

[0003] In the related art, the flywheel energy storage system uses mechanical bearings, which have large mechanical friction loss, thereby reducing the energy conversion efficiency of the flywheel energy storage system. In addition, the mechanical bearings generate a large amount of heat due to friction loss, thereby reducing the service life of the flywheel energy storage system. In order to solve the problems of the flywheel energy storage system using mechanical bearings, some flywheel energy storage systems use magnetic suspension bearings. However, the existing flywheel energy storage systems using magnetic suspension bearings have complex structures, high processing and manufacturing requirements, and low working reliability. SUMMARY

[0004] Therefore, it is necessary to provide a flywheel energy storage system to solve the problems of the traditional technology, such as complex structure, high processing and manufacturing requirements, and low working reliability.

[0005] The present application provides a flywheel energy storage system, which comprises:

[0006] A housing, an installation cavity is formed in the interior of the housing;

[0007] A magnetic drive module is arranged on the side wall of the installation cavity;

[0008] A flywheel rotor is arranged in the installation cavity, and the flywheel rotor is driven in cooperation with the magnetic drive module, so that the flywheel rotor can rotate in the installation cavity;

[0009] 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

[0010] At least two magnetic bearings are arranged on the side wall of the installation cavity at intervals, and surround the outer periphery of the flywheel rotor.

[0011] In the flywheel energy storage system of the scheme, the magnetic drive module, the flywheel rotor, the magnetic suspension module and at least two magnetic bearings are respectively installed to the installation cavities of the shell at the set positions, so that on the one hand, the magnetic suspension module generates a magnetic suspension force to enable the flywheel rotor to be suspended and installed in the installation cavity along the Z-axis direction, and the magnetic suspension module can constrain the translation of the flywheel rotor along the Z-axis direction; on the other hand, the magnetic drive module generates a rotating magnetic field after being energized, which can drive the flywheel rotor to rotate at a high speed, realize the conversion of the flywheel rotor from electrical energy to mechanical energy, and store the mechanical energy. In this process, the at least two magnetic bearings installed around the outer periphery of the flywheel rotor can not only constrain the translation of the flywheel rotor in the XY-axis plane, but also constrain the rotation of the flywheel rotor in the XY-axis plane through reasonable air gap magnetic flux regulation, thereby realizing the non-contact rotary support of the flywheel rotor, preventing mechanical friction and wear, and ensuring the energy conversion efficiency and service life of the flywheel energy storage system. Compared with the prior art, the flywheel energy storage system of the scheme has simple structure, compact and reasonable layout, low processing and manufacturing difficulty, and high working reliability.

[0012] The technical scheme of the present application is further described below:

[0013] In one of the embodiments, the side wall of the installation cavity is concavely formed with a positioning groove, the magnetic bearing is arranged in the positioning groove, and part of the magnetic bearing protrudes outside the slot opening of the positioning groove to gap fit the flywheel rotor and the side wall of the installation cavity.

[0014] In one of the embodiments, the magnetic bearing comprises a first magnetic assembly and a second magnetic assembly, the first magnetic assembly and the second magnetic assembly are arranged in the width direction of the positioning groove, the first magnetic assembly is used to constrain the translation of the flywheel rotor in the XY-axis plane, and the second magnetic assembly is used to constrain the rotation of the flywheel rotor in the XY-axis plane.

[0015] In one of the embodiments, the first magnetic assembly and the second magnetic assembly each comprise a magnetic bearing stator and a magnetic bearing winding, and the magnetic bearing winding is wound on the outside of the magnetic bearing stator.

[0016] In one of the embodiments, the magnetic bearing further comprises a magnetic bearing permanent magnet, and the magnetic bearing permanent magnet is arranged in the interval between the first magnetic assembly and the second magnetic assembly.

[0017] In one of the embodiments, the flywheel energy storage system comprises a plurality of magnetic bearings, a plurality of magnetic conductive rings and a plurality of positioning grooves, the plurality of positioning grooves are formed on the side wall of the installation cavity in the circumferential direction, the magnetic bearings are arranged in the positioning grooves one by one, and one magnetic conductive ring is connected between two adjacent magnetic bearings.

[0018] In one of the embodiments, the magnetic suspension module comprises an upper magnetic suspension permanent magnet, a lower magnetic suspension permanent magnet and a fixed ring, the fixed ring is fixedly installed at the bottom of the flywheel rotor, the upper magnetic suspension permanent magnet is installed on the inner ring wall of the fixed ring, and the lower magnetic suspension permanent magnet is installed on the side wall of the installation cavity and arranged in axial spacing opposite to the upper magnetic suspension permanent magnet.

[0019] In one of the embodiments, first and second openings are respectively formed on opposite sides of the shell, and first and second flywheel shafts are respectively protruded on axially opposite sides of the flywheel rotor.

[0020] A first end cover is installed on the outside of the first opening, a second end cover is installed on the outside of the second opening, the magnetic drive module comprises first and second magnetic drive assemblies, the first magnetic drive assembly is arranged in the first end cover and drivingly cooperates with the first flywheel shaft, and the second magnetic drive assembly is arranged in the second end cover and drivingly cooperates with the second flywheel shaft.

[0021] In one of the embodiments, the first and second magnetic drive assemblies each comprise 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 and second flywheel shafts, the magnetic drive stator is fixedly installed on the first and second end covers, and the magnetic drive winding is arranged in the interval between the magnetic drive stator and the first and second end covers.

[0022] In one of the embodiments, the magnetic drive permanent magnet is wrapped with a carbon fiber sheath. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve the purpose of explaining the present application. The accompanying drawings should not be construed as an inappropriate limitation to the present application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 The structural schematic diagram of the magnetic suspension flywheel energy storage performance of an embodiment.

[0026] Figure 2 For Figure 1 The structural schematic diagram from another perspective.

[0027] Figure 3 Exploded view of flywheel energy storage system.

[0028] Figure 4 Axial sectional view of flywheel energy storage system.

[0029] Figure 5 Axial sectional view of flywheel energy storage system from another perspective.

[0030] Figure 6 Mounting structure of magnetic bearing and magnetic conductive ring in housing.

[0031] Figure 7 Assembly structure of magnetic bearing, magnetic conductive ring and flywheel rotor.

[0032] Figure 8 Assembly structure of multiple magnetic bearings and multiple magnetic conductive rings.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 100, flywheel energy storage system; 10, housing; 11, mounting cavity; 12, positioning groove; 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 suspension module; 41, upper magnetic suspension permanent magnet; 42, lower magnetic suspension permanent magnet; 43, fixed 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 conductive ring; 70, first end cover; 80, second end cover; 90, carbon fiber sleeve. DETAILED DESCRIPTION

[0035] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore intended that the present application not be limited to the embodiments presented herein. Instead, the scope of the present application covers all modifications and variations of this application that fall within the scope of the appended claims.

[0036] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0037] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element, or intervening elements can be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms are used for explanation only and are not intended to be limiting.

[0041] Referring to Figures 1 to 8 A flywheel energy storage system 100 according to an embodiment of the present application comprises a housing 10, a magnetic drive module 20, a flywheel rotor 30, a magnetic suspension module 40, and at least two magnetic bearings 50. The housing 10 is the main component of the flywheel energy storage system 100, and serves to load the magnetic drive module 20, the flywheel rotor 30, the magnetic suspension module 40, and the at least two magnetic bearings 50.

[0042] For example, the housing 10 is made of stainless steel and has a flat cylindrical structure, which is convenient to manufacture, has high strength, and is durable.

[0043] Please continue to refer to Figure 4 The housing 10 has an installation cavity 11 formed inside. The magnetic drive module 20 is arranged on the side wall of the installation cavity 11. The flywheel rotor 30 is arranged in the installation cavity 11 and is drivingly connected to the magnetic drive module 20, so that the flywheel rotor 30 can rotate in the installation cavity 11. The magnetic suspension module 40 is connected between the lower part of the flywheel rotor 30 and the side wall of the installation cavity 11, and serves to achieve the suspension installation of the flywheel rotor 30. The at least two magnetic bearings 50 are arranged on the side wall of the installation cavity 11 in a spaced apart manner, and surround the outer periphery of the flywheel rotor 30.

[0044] In summary, the flywheel energy storage system 100 of the present embodiment has the following advantages: the magnetic drive module 20, the flywheel rotor 30, the magnetic suspension module 40 and the at least two magnetic bearings 50 are respectively installed at the predetermined positions in the mounting cavity 11 of the housing 10, so that on the one hand, the magnetic suspension module 40 generates a magnetic suspension force to enable the flywheel rotor 30 to be suspended and installed in the mounting cavity 11 along the Z-axis direction, and the magnetic suspension module 40 can constrain the translation 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 a high speed, realize the conversion of electrical energy into mechanical energy by the flywheel rotor 30, and in this process, the at least two magnetic bearings 50 surrounding the outer periphery of the flywheel rotor 30 can constrain the translation and rotation of the flywheel rotor 30 in the XY-axis plane by reasonable air gap magnetic flux regulation, thereby realizing the non-contact rotary support of the flywheel rotor 30, preventing mechanical friction and wear, and ensuring the energy conversion efficiency and service life of the flywheel energy storage system; and compared with the prior art, the flywheel energy storage system 100 has a simple structure, a compact and reasonable layout, low processing and manufacturing difficulty, and high working reliability.

[0045] On the basis of the above-mentioned embodiments, in an embodiment, the side wall of the mounting cavity 11 is recessed to form a positioning groove 12, and the magnetic bearing 50 is arranged in the positioning groove 12, and part of the magnetic bearing 50 protrudes outside the slot of the positioning groove 12, so that the flywheel rotor 30 is gap-fitted with the side wall of the mounting cavity 11.

[0046] By arranging the magnetic bearing 50 in the positioning groove 12, the magnetic bearing 50 can be arranged more stably, and the magnetic bearing 50 only partially extends into the mounting cavity 11, which on the one hand avoids occupying too much space in the mounting cavity 11 and increasing the arrangement difficulty of the flywheel rotor 30, and on the other hand, the position of the flywheel rotor 30 in the XY plane in the mounting cavity 11 can be limited by the magnetic bearing 50, so that the flywheel rotor 30 can be gap-fitted with the side wall of the mounting cavity 11, avoiding contact friction and wear during rotation of the flywheel rotor 30, and affecting the rotation efficiency and service life of the flywheel rotor 30.

[0047] Alternatively, the magnetic bearing 50 can be fixed in the positioning groove 12 by any one of interference fit, adhesion, clamping and the like, which can be flexibly selected according to actual needs, and is not limited here.

[0048] More specifically, in one alternative embodiment, the magnetic bearing 50 comprises a first magnetic assembly 51 and a second magnetic assembly 52, the first magnetic assembly 51 and the second magnetic assembly 52 are arranged in a spaced-apart manner along the slot width direction of the positioning slot 12, the first magnetic assembly 51 is used to constrain the flywheel rotor 30 to produce translation in the XY axial plane, and the second magnetic assembly 52 is used to constrain the flywheel rotor 30 to produce rotation in the XY axial plane.

[0049] That is, the magnetic bearing 50 of the present application is actually a hybrid magnetic bearing 50. In operation, by controlling the air gap magnetic flux of the first magnetic assembly 51, the flywheel rotor 30 can be constrained to produce translation in the XY axial plane; by controlling the air gap magnetic flux of the second magnetic assembly 52, the flywheel rotor 30 can be constrained to produce rotation in the XY axial plane, thereby achieving a good non-contact support and positioning effect of the magnetic bearing 50 on the flywheel rotor 30.

[0050] Please continue to refer to Figure 4 , Figure 7 and Figure 8 , and in particular, on the basis of the above-mentioned embodiments, the first magnetic assembly 51 and the second magnetic assembly 52 each comprise a magnetic bearing stator 50a and a magnetic bearing winding 50b, the magnetic bearing winding 50b is wound on the outside of the magnetic bearing stator 50a.

[0051] The magnetic bearing stator 50a serves as a fixed part of the magnetic bearing 50, and by means of the wound magnetic bearing winding 50b, a controllable magnetic field force can be generated to directly exert a magnetic attractive force or repulsive force on the flywheel rotor 30 to maintain the flywheel rotor 30 suspended at a predetermined position. The magnetic bearing stator 50a is also used to form an air gap with the flywheel rotor 30 to ensure no mechanical contact.

[0052] Further, on the basis of the above-mentioned embodiments, the magnetic bearing 50 further comprises a magnetic bearing permanent magnet 50c, which is arranged in the space between the first magnetic assembly 51 and the second magnetic assembly 52. The magnetic bearing permanent magnet 50c is mainly used to provide a static bias magnetic field to bear most of the weight of the flywheel rotor 30 or the initial magnetic force requirement, which can significantly reduce the power consumption of the electromagnetic coil and reduce the ampere-turns of the electromagnet, thereby optimizing the system efficiency and volume. In particular, in the hybrid magnetic bearing 50, the magnetic bearing permanent magnet 50c works in conjunction with the magnetic bearing winding 50b (i.e. the electromagnetic coil), the permanent magnet establishes a basic magnetic field, and the magnetic bearing winding 50b achieves dynamic balance by quickly adjusting the current, thereby improving the suspension stability and response speed.

[0053] Please continue to refer to Figures 6 to 8Optionally, in one embodiment of the present application, the flywheel energy storage system 100 comprises a plurality of magnetic bearings 50, a plurality of magnetic conductive rings 60, and a plurality of positioning grooves 12 formed on the side wall of the mounting cavity 11 along the circumferential direction, one-to-one correspondence of the magnetic bearing 50 is installed in the positioning groove 12, and one magnetic conductive ring 60 is connected between the adjacent two magnetic bearings 50.

[0054] Specifically, the magnetic bearing 50 and the magnetic conductive ring 60 are provided with four, and the four magnetic bearings 50 and the four magnetic conductive rings 60 are alternately connected as a closed ring structure; that is, the four magnetic bearings 50 and the four magnetic conductive rings 60 are arranged in a cross-shaped structure, which can be matched with the cross-shaped structure of the flywheel rotor 30, thereby fully exerting the magnetic suspension support of the four magnetic bearings 50, ensuring the balanced circumferential stress of the flywheel rotor 30, and further ensuring the stable posture of the flywheel rotor 30 when rotating at high speed to avoid contact and friction with the shell 10.

[0055] The magnetic conductive ring 60 arranged between the adjacent two magnetic bearings 50 can construct a more stable magnetic field loop, efficiently concentrate the magnetic lines, thereby generating sufficient suspension force, and also shield external magnetic field interference to ensure stable work of the magnetic bearing 50.

[0056] Please continue to refer to Figure 4 In another embodiment, the magnetic suspension module 40 comprises an upper magnetic suspension permanent magnet 41, a lower magnetic suspension permanent magnet 42, and a fixed ring 43, the fixed ring 43 is fixedly installed on the bottom of the flywheel rotor 30, the upper magnetic suspension permanent magnet 41 is installed on the inner ring wall of the fixed ring 43, and the lower magnetic suspension permanent magnet 42 is installed on the side wall of the mounting cavity 11 and arranged in axial spaced relation with the upper magnetic suspension permanent magnet 41.

[0057] When working, the repulsive force is generated by the interaction between the upper magnetic suspension permanent magnet 41 and the lower magnetic suspension permanent magnet 42 to overcome the gravity of the flywheel rotor 30, thereby realizing the suspension of the flywheel rotor 30 in the mounting cavity 11. Further, the stable magnetic field is provided by the upper magnetic suspension permanent magnet 41 and the lower magnetic suspension permanent magnet 42, and the electromagnetic force is dynamically adjusted by combining the control system (such as PID algorithm) to ensure that the suspended body keeps balance.

[0058] In one embodiment, the shell 10 is provided with a first opening and a second opening on opposite sides, and the flywheel rotor 30 is provided with a first flywheel shaft 31 and a second flywheel shaft 32 on the axially opposite sides.

[0059] Please continue to refer to Figure 4The first opening is externally provided with a first end cover 70, the second opening is externally provided with a second end cover 80, the magnetic drive module 20 comprises a first magnetic drive assembly 21 and a second magnetic drive assembly 22, the first magnetic drive assembly 21 is arranged in the first end cover 70 and is in driving cooperation with the first flywheel shaft 31, and the second magnetic drive assembly 22 is arranged in the second end cover 80 and is in driving cooperation with the second flywheel shaft 32.

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

[0061] Specifically, the first magnetic drive assembly 21 and the second magnetic drive assembly 22 each comprise 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 arranged on the first end cover 70 and the second end cover 80, and the magnetic drive winding 20b is arranged in a space between the magnetic drive stator 20a and the first end cover 70 and the second end cover 80.

[0062] When the magnetic drive winding 20b is powered, a controllable rotating magnetic field can be generated, the rotating magnetic field interacts with the magnetic field of the permanent magnet to generate a driving torque, and then the flywheel rotor 30 can be driven to rotate at a high speed to convert electrical energy into mechanical energy for storage.

[0063] Further, the magnetic drive permanent magnet 20c is wrapped with a carbon fiber sleeve 90. By virtue of the light weight and high strength characteristics of the carbon fiber sleeve 90, the magnetic drive permanent magnet 20c is protected from high-speed centrifugal force, high temperature and external environment damage, and the working efficiency of the first magnetic drive assembly 21 and the second magnetic drive assembly 22 is improved.

[0064] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0065] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A flywheel energy storage system, characterized in that, include: A housing, the interior of which is formed a mounting cavity; 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 sidewall of the mounting cavity and surround the outer periphery of the flywheel rotor.

2. The flywheel energy storage system according to claim 1, characterized in that, 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.

3. The flywheel energy storage system according to claim 2, characterized in that, 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 produce translation in the XY axis plane, and the second magnetic component is used to constrain the flywheel rotor to produce rotation in the XY axis plane.

4. The flywheel energy storage system according to claim 3, 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.

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

6. The flywheel energy storage system according to any one of claims 2 to 5, characterized in that, 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.

7. 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.

8. 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.

9. The flywheel energy storage system according to claim 8, 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.

10. The flywheel energy storage system according to claim 9, characterized in that, The magnetically driven permanent magnet is externally wrapped with a carbon fiber sheath.

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