Energy storage flywheel

Abstract

The invention discloses an energy storage flywheel which comprises a shell, a flywheel rotor and a radial magnetic bearing assembly, a center shaft support is connected between a top plate and a bottom plate of the shell, the flywheel rotor is arranged in the shell and is a cylinder, and the radial magnetic bearing rotor is installed on the inner circumferential face of the flywheel rotor and annularly arranged in the circumferential direction of the flywheel rotor. The multiple hydraulic control pieces are evenly spaced in the circumferential direction of the center shaft support, each hydraulic control piece comprises a hydraulic oil cylinder and a piston rod, the hydraulic oil cylinders are installed on the outer circumferential face of the center shaft support, and the radial magnetic bearing stators are installed at the ends, facing the radial magnetic bearing stators, of the piston rods. According to the energy storage flywheel, the hydraulic control piece can be used for flexibly controlling the radial magnetic bearing stator to move in the radial direction, so that when the flywheel rotor rotates at a high speed and generates large deformation, the air gap of the radial magnetic bearing is kept unchanged by moving the radial magnetic bearing stator; and therefore, the bearing capacity, the control precision, the linearity and the like of the magnetic bearing in a high-speed rotating state are not influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular, to an energy storage flywheel. Background Art

[0002] A flywheel energy storage system is an efficient and energy-saving inertial energy storage device. It stores energy by using a flywheel rotating at a super-high speed, and realizes the mutual conversion of mechanical energy and electrical energy through an electromechanical energy conversion device.

[0003] In related technologies, in order to reduce the volume of the flywheel device, the flywheel can adopt the form of a shaftless rotor hub. However, due to the action of centrifugal force, the rotor will generate large radial deformation during high-speed rotation, which will increase the air gap of the radial magnetic bearing. With the change of the air gap, it will affect the bearing capacity, control accuracy, linearity, etc. of the magnetic bearing. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0005] To this end, an embodiment of the present invention provides an energy storage flywheel. By arranging a hydraulic control member for installing a radial magnetic bearing stator on a central axis support, the hydraulic control member can flexibly control the radial movement of the radial magnetic bearing stator, so that when the flywheel rotor generates large deformation during high-speed rotation, the air gap of the radial magnetic bearing can be kept unchanged by moving the radial magnetic bearing stator, thereby ensuring that the bearing capacity, control accuracy, linearity, etc. of the magnetic bearing under the high-speed rotation state are not affected.

[0006] The energy storage flywheel according to an embodiment of the present invention includes: a housing, a central axis support is connected between the top plate and the bottom plate of the housing; a flywheel rotor, which is arranged in the housing and is in a cylindrical shape, and the flywheel rotor surrounds the outer periphery of the central axis support; a radial magnetic bearing assembly, which includes a radial magnetic bearing rotor, a radial magnetic bearing stator and a hydraulic control member. The radial magnetic bearing rotor is installed on the inner peripheral surface of the flywheel rotor and is arranged in a ring shape along the circumferential direction of the flywheel rotor. The hydraulic control members are multiple and are evenly spaced along the circumferential direction of the central axis support. Each hydraulic control member includes a hydraulic cylinder and a piston rod. The hydraulic cylinder is installed on the outer peripheral surface of the central axis support, and the piston rod is installed with the radial magnetic bearing stator at the end facing the radial magnetic bearing stator; an axial magnetic bearing assembly, which includes an axial magnetic bearing stator magnet and an axial magnetic bearing rotor magnet. The axial magnetic bearing stator magnet is arranged on the bottom plate, and the axial magnetic bearing rotor magnet is arranged on the bottom surface of the flywheel rotor and is opposite to the axial magnetic bearing stator magnet.

[0007] The energy storage flywheel of the embodiment of the present invention has a central axis support connected between the top plate and the bottom plate of the housing. The flywheel rotor is arranged in the housing and is in a cylindrical shape. The flywheel rotor surrounds the outer periphery of the central axis support. The radial magnetic bearing rotor is installed on the inner peripheral surface of the flywheel rotor and is arranged in a ring shape along the circumferential direction of the flywheel rotor. The hydraulic control components are multiple and evenly spaced along the circumferential direction of the central axis support. Each hydraulic control component includes a hydraulic cylinder and a piston rod. The hydraulic cylinder is installed on the outer peripheral surface of the central axis support, and the end of the piston rod facing the radial magnetic bearing stator is installed with the radial magnetic bearing stator. Thus, by arranging the hydraulic control components for installing the radial magnetic bearing stator on the central axis support, the hydraulic control components can be used to flexibly control the radial movement of the radial magnetic bearing stator, so that when the flywheel rotor rotates at a high speed and generates large deformation, the air gap of the radial magnetic bearing can be kept unchanged by moving the radial magnetic bearing stator, thereby ensuring that the bearing capacity, control accuracy, linearity, etc. of the magnetic bearing under the high-speed rotation state are not affected.

[0008] In some embodiments, an oil passage is provided in the central axis support. One end of the oil passage communicates with an external oil supply device, and the other end communicates with the hydraulic cylinder.

[0009] In some embodiments, the radial magnetic bearing assembly further includes a radial displacement sensor. The radial displacement sensor is arranged on the radial magnetic bearing, and the radial displacement sensor is used to detect the position state between the radial magnetic bearing stator and the radial magnetic bearing rotor.

[0010] In some embodiments, the radial magnetic bearing stator includes a radial magnetic bearing stator iron core and a radial magnetic bearing stator coil wound thereon. The radial magnetic bearing rotor includes a radial magnetic bearing rotor iron core and radial magnetic bearing rotor magnets arranged thereon.

[0011] In some embodiments, a card slot is provided on the outer end surface of the radial magnetic bearing stator iron core. The radial displacement sensor is arranged in the card slot. An annular groove is provided on the inner peripheral surface of the radial magnetic bearing rotor iron core, and a detection component for the position sensor to detect is arranged in the annular groove.

[0012] In some embodiments, the radial magnetic bearing rotor magnets are arranged in the annular groove and are located outside the detection component, and a magnetic isolation layer is laid on the inner peripheral surface of the annular groove. The detection component has magnetic conductivity.

[0013] In some embodiments, a stator protection layer is provided on the outer end surface of the radial magnetic bearing stator iron core, and a rotor protection layer is provided on the inner peripheral surface of the radial magnetic bearing rotor iron core.

[0014] An oil injection device is further provided on the outer peripheral surface of the central axis support, and the oil injection device can spray lubricating oil towards the rotor protection layer.

[0015] In some embodiments, a motor stator is further provided on the outer peripheral surface of the central shaft bracket, and a motor rotor opposite to the motor stator is provided on the inner peripheral surface of the flywheel rotor.

[0016] In some embodiments, the energy storage flywheel further includes a protective bearing, and the protective bearing includes a base, a mechanical bearing and a tray. The base is installed on the bottom plate and surrounds the outer periphery of the central shaft bracket. The tray includes a connecting ring plate and an outer tray. The connecting ring plate is fitted inside the base and the mechanical bearing is arranged between the connecting ring plate and the base. The inner end of the outer tray is connected to the connecting ring plate, and the outer tray is spaced below the flywheel rotor.

[0017] In some embodiments, a support seat protruding upward is further provided on the bottom plate, and the top surface of the support seat is flush with the axial magnetic bearing stator magnet. The outer tray includes a first section and a second section. The first section is located between the axial magnetic bearing stator magnet and the axial magnetic bearing rotor magnet, and the second section is located between the flywheel rotor and the support seat, and the second section is bent downward relative to the first section. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of an energy storage flywheel according to an embodiment of the present invention.

[0019] Reference Signs:

[0020] Housing 1, central shaft bracket 2, motor stator 3, motor rotor 4, hydraulic control member 5, radial magnetic bearing stator 6, radial magnetic bearing rotor 7, radial displacement sensor 8, detection member 9, stator protective layer 10, rotor protective layer 11, axial magnetic bearing stator magnet 12, axial magnetic bearing rotor magnet 13, support seat 14, tray 15, mechanical bearing 16, flywheel rotor 17. Detailed Description of the Embodiments

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0022] As Figure 1 shown, the energy storage flywheel according to an embodiment of the present invention includes a housing 1, a flywheel rotor 17 and a radial magnetic bearing assembly.

[0023] Specifically, a central axis support 2 is connected between the top plate and the bottom plate of the housing 1. The flywheel rotor 17 is arranged inside the housing 1 and is in a cylindrical shape. The flywheel rotor 17 surrounds the outer periphery of the central axis support 2. The radial magnetic bearing assembly includes a radial magnetic bearing rotor 7, a radial magnetic bearing stator 6, and a hydraulic control member 5. The radial magnetic bearing rotor 7 is installed on the inner peripheral surface of the flywheel rotor 17 and is arranged in a ring shape along the circumferential direction of the flywheel rotor 17. The hydraulic control members 5 are multiple and evenly spaced along the circumferential direction of the central axis support 2. Each hydraulic control member 5 includes a hydraulic cylinder and a piston rod. The hydraulic cylinder is installed on the outer peripheral surface of the central axis support 2. The end of the piston rod facing the radial magnetic bearing stator 6 is installed with the radial magnetic bearing stator 6. The axial magnetic bearing assembly includes an axial magnetic bearing stator magnet 12 and an axial magnetic bearing rotor magnet 13. The axial magnetic bearing stator magnet 12 is arranged on the bottom plate, and the axial magnetic bearing rotor magnet 13 is arranged on the bottom surface of the flywheel rotor 17 and is opposite to the axial magnetic bearing stator magnet 12.

[0024] Specifically, as Figure 1 shown, a set of radial magnetic bearing assemblies are provided at the top and bottom of the central axis support 2 respectively, for controlling the balance of both ends of the flywheel rotor 17 respectively.

[0025] It can be understood that when the flywheel rotor 17 generates large radial deformation during high-speed rotation, resulting in an increase in the radial magnetic bearing air gap, the hydraulic control member 5 can be used to control the piston rod to extend outwards, thereby driving the radial magnetic bearing stator 6 to move outwards to compensate for the increase in the air gap caused by the large deformation, so that the radial magnetic bearing gap always remains unchanged, ensuring that the bearing capacity, control accuracy, linearity, etc. of the magnetic bearing under the high-speed rotation state are not affected.

[0026] For the energy storage flywheel according to the embodiment of the present invention, a central axis support 2 is connected between the top plate and the bottom plate of the housing 1. The flywheel rotor 17 is arranged inside the housing 1 and is in a cylindrical shape. The flywheel rotor 17 surrounds the outer periphery of the central axis support 2. The radial magnetic bearing rotor 7 is installed on the inner peripheral surface of the flywheel rotor 17 and is arranged in a ring shape along the circumferential direction of the flywheel rotor 17. The hydraulic control members 5 are multiple and evenly spaced along the circumferential direction of the central axis support 2. Each hydraulic control member 5 includes a hydraulic cylinder and a piston rod. The hydraulic cylinder is installed on the outer peripheral surface of the central axis support 2. The end of the piston rod facing the radial magnetic bearing stator 6 is installed with the radial magnetic bearing stator 6. Thus, by providing the hydraulic control member 5 for installing the radial magnetic bearing stator 6 on the central axis support 2, the hydraulic control member 5 can be used to flexibly control the radial movement of the radial magnetic bearing stator 6, so that when the flywheel rotor 17 generates large deformation during high-speed rotation, the air gap of the radial magnetic bearing can be kept unchanged by moving the radial magnetic bearing stator 6, thereby ensuring that the bearing capacity, control accuracy, linearity, etc. of the magnetic bearing under the high-speed rotation state are not affected.

[0027] In addition, the flywheel rotor 17 of the present application adopts a shaftless structure, which can improve the energy storage density, reduce the processing and forging costs of the rotor, improve the utilization rate of materials, and increase the volume density and energy storage density.

[0028] Furthermore, the most ideal state of magnetic bearing control is to make the rotor rotate along its inertial axis. However, affected by dynamic imbalance, the inertial axis does not coincide with the geometric axis, resulting in uneven rotation air gaps of the magnetic bearings. As a result, the control force of the magnetic bearings is relatively large and the loss is significant. There is a risk of instability at the smaller areas with uneven air gaps. By adjusting the hydraulic control component 5, the air gaps can be kept uniform and the control force can be minimized.

[0029] In addition, the flywheel rotor 17 also has the problem of non-concentricity caused by assembly errors. Since the hydraulic control components 5 are arranged at intervals in the circumferential direction of the middle shaft bracket 2, according to the offset direction of the flywheel rotor 17, the radial magnetic bearing gaps at the corresponding positions can be adjusted, thereby achieving concentric adjustment.

[0030] In some embodiments, an oil passage is provided in the middle shaft bracket 2. One end of the oil passage communicates with an external oil supply device, and the other end communicates with the hydraulic cylinder. Thus, the hydraulic oil of the hydraulic cylinder can be supplied through the oil passage in the middle shaft bracket 2, eliminating the need to set up an oil injection pipeline, which is beneficial to optimizing the overall structure of the energy storage flywheel.

[0031] Furthermore, as Figure 1 shown, the radial magnetic bearing assembly further includes a radial displacement sensor 8. The radial displacement sensor 8 is arranged on the radial magnetic bearing and is used to detect the position state between the radial magnetic bearing stator 6 and the radial magnetic bearing rotor 7. Thus, when the flywheel rotor 17 undergoes large deformation during high-speed rotation, the radial displacement sensor can timely detect the change in the gap between the radial magnetic bearing stator 6 and the radial magnetic bearing rotor 7. The hydraulic control component 5 can change the oil injection amount according to the change in the gap, and then move the radial magnetic bearing stator 6 to compensate for the change in the gap, ensuring that the gap remains constant.

[0032] Furthermore, the radial magnetic bearing assembly further includes a controller. The controller can control the oil injection amount of the hydraulic control component 5 according to the detection information of the radial displacement sensor 8, realizing the automatic movement of the radial magnetic bearing stator 6 and ensuring that the magnetic bearing gap always remains unchanged.

[0033] In some embodiments, the radial magnetic bearing stator 6 includes a radial magnetic bearing stator 6 iron core and a radial magnetic bearing stator 6 coil wound thereon. The radial magnetic bearing rotor 7 includes a radial magnetic bearing rotor 7 iron core and a radial magnetic bearing rotor 7 permanent magnet arranged thereon. In other words, the magnetic force of the radial magnetic bearing stator 6 can be actively controlled, facilitating the active adjustment of the magnetic force size according to the changes in rotational speed and centrifugal force, which is beneficial to maintaining the rotational stability of the flywheel rotor 17 under different working conditions.

[0034] Furthermore, a clamping groove is provided on the outer end face of the core of the radial magnetic bearing stator 6, the radial displacement sensor 8 is arranged in the clamping groove, an annular groove is provided on the inner peripheral surface of the core of the radial magnetic bearing rotor 7, and a detection component 9 for detection by the sensor is arranged in the annular groove. Thus, the core of the radial magnetic bearing stator 6 can be used as an assembly part to install the radial displacement sensor 8 inside, without occupying the assembly space inside the housing 1, and the core of the radial magnetic bearing rotor 7 can install the detection component 9 inside.

[0035] Furthermore, as Figure 1 shown, the magnetic steel of the radial magnetic bearing rotor 7 is arranged in the annular groove and is located outside the detection component 9, and a magnetic isolation layer is laid on the inner peripheral surface of the annular groove, and the detection component 9 has magnetic permeability.

[0036] In some embodiments, a stator protection layer 10 is provided on the outer end face of the core of the radial magnetic bearing stator 6, and a rotor protection layer 11 is provided on the inner peripheral surface of the core of the radial magnetic bearing rotor 7. Thus, when axial instability occurs during the rotation of the flywheel, the stator protection layer 10 and the rotor protection layer 11 can achieve contact protection to avoid collision and wear between the core of the radial magnetic bearing stator 6 and the core of the radial magnetic bearing rotor 7.

[0037] Preferably, the stator protection layer 10 and the rotor protection layer 11 are nano - coatings.

[0038] Furthermore, an oil injection device is further provided on the outer peripheral surface of the central shaft bracket 2, and the oil injection device can spray lubricating oil towards the rotor protection layer 11. Thus, when axial instability occurs in the flywheel rotor 17, the oil injection device can spray oil onto the protection layer in advance, and use lubricity to reduce contact wear.

[0039] In some embodiments, a motor stator 3 is further provided on the outer peripheral surface of the central shaft bracket 2, and a motor rotor 4 opposite to the motor stator 3 is provided on the inner peripheral surface of the flywheel rotor 17. In other words, the drive motor of the flywheel device is also integrated inside the housing 1. Cooperating with the radial magnetic bearing integrated on the flywheel, it can reduce external components and improve the compactness and reliability of the overall system.

[0040] Further, as Figure 1 shown, the energy - storage flywheel further includes a protection bearing, and the protection bearing includes a base, a mechanical bearing 16 and a tray 15. The base is installed on the bottom plate and surrounds the outer periphery of the central shaft bracket 2. The tray includes a connecting ring plate and an outer tray. The connecting ring plate is fitted inside the base and a mechanical bearing 16 is arranged between the connecting ring plate and the base. The inner end of the outer tray is connected to the connecting ring plate, and the outer tray is spaced below the flywheel rotor 17.

[0041] Thus, when the flywheel rotor 17 gets out of control, the flywheel rotor 17 sinks and can be supported by the tray 15, and then the tray 15 rotates around the mechanical bearing 16 under the drive of inertia, so as to maintain the rotation of the flywheel rotor 17 and avoid safety accidents.

[0042] Furthermore, a support base 14 protruding upward is provided on the bottom plate. The top surface of the support base 14 is flush with the stator magnet 12 of the axial magnetic bearing. The outer support plate includes a first section and a second section. The first section is located between the stator magnet 12 of the axial magnetic bearing and the rotor magnet 13 of the axial magnetic bearing. The second section is located between the flywheel rotor 17 and the support base 14, and the second section is bent downward relative to the first section. In other words, the first section protrudes upward relative to the second section. When the flywheel rotor 17 is out of control and presses tightly on the outer support plate, the second section will come into contact with the support base 14 first, thereby preventing the bearing magnetic bearing rotor and the stator of the axial magnetic bearing from contacting the outer support plate and avoiding wear.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0045] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly defined or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0047] In the present invention, the terms "an embodiment", "some embodiments", "an example", "a specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0048] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An energy storage flywheel, characterized in that: include: Shell, wherein a central axis bracket is connected between the top plate and the bottom plate of the shell: A flywheel rotor, which is disposed in the housing and is in the form of a cylinder, and surrounds the outer circumference of the central axis support; A radial magnetic bearing assembly, the radial magnetic bearing assembly comprising a radial magnetic bearing rotor, a radial magnetic bearing stator and a hydraulic control member, the radial magnetic bearing rotor being mounted on the inner circumferential surface of the flywheel rotor and being arranged in an annular manner along the circumference of the flywheel rotor, the hydraulic control member being a plurality of members evenly spaced along the circumference of the central axis support, each of the hydraulic control members comprising a hydraulic cylinder and a piston rod, the hydraulic cylinder being mounted on the outer circumferential surface of the central axis support, the radial magnetic bearing stator being mounted on the end of the piston rod facing the radial magnetic bearing stator; An axial magnetic bearing assembly, the axial magnetic bearing assembly includes an axial magnetic bearing stator magnet and an axial magnetic bearing rotor magnet. The axial magnetic bearing stator magnet is arranged on the base plate, and the axial magnetic bearing rotor magnet is arranged on the bottom surface of the flywheel rotor and is opposite to the axial magnetic bearing stator magnet.

2. The energy storage flywheel according to claim 1, characterized in that: An oil passage is provided in the central axis support, one end of the oil passage is connected to an external oil supply device, and the other end is connected to the hydraulic cylinder.

3. The energy storage flywheel according to claim 1, characterized in that: The radial magnetic bearing assembly further includes a radial displacement sensor, which is disposed on the radial magnetic bearing and is used to detect a position state between the radial magnetic bearing stator and the radial magnetic bearing rotor.

4. The energy storage flywheel according to claim 3, characterized in that: The radial magnetic bearing stator comprises a radial magnetic bearing stator iron core and a radial magnetic bearing stator coil wound thereon, and the radial magnetic bearing rotor comprises a radial magnetic bearing rotor iron core and a radial magnetic bearing rotor magnetic steel arranged thereon.

5. The energy storage flywheel according to claim 4, characterized in that: The outer end surface of the radial magnetic bearing stator core is provided with a slot, the radial displacement sensor is arranged in the slot, the inner circumferential surface of the radial magnetic bearing rotor core is provided with an annular groove, and a detection component for the sensor to detect is arranged in the annular groove.

6. The energy storage flywheel according to claim 5, characterized in that: The radial magnetic bearing rotor magnetic steel is arranged in the annular groove and located outside the detection component, and a magnetic isolation layer is laid on the inner circumferential surface of the annular groove. The detection component has magnetic conductivity.

7. The energy storage flywheel according to claim 4, characterized in that: A stator protective layer is provided on the outer end surface of the radial magnetic bearing stator core, and a rotor protective layer is provided on the inner circumferential surface of the radial magnetic bearing rotor core; An oil spray device is also provided on the outer peripheral surface of the middle shaft support, and the oil spray device can spray lubricating oil toward the rotor protective layer.

8. The energy storage flywheel according to claim 1, characterized in that: A motor stator is also provided on the outer circumferential surface of the central axis support, and a motor rotor opposite to the motor stator is provided on the inner circumferential surface of the flywheel rotor.

9. The energy storage flywheel according to claim 1, characterized in that: It also includes a protective bearing, which includes a base, a mechanical bearing and a tray. The base is installed on the bottom plate and surrounds the outer circumference of the central axis bracket. The support plate includes a connecting ring plate and an outer support plate. The connecting ring plate is matched with the inner side of the base and the mechanical bearing is arranged between the base. The inner end of the outer support plate is connected to the connecting ring plate, and the outer support plate is arranged below the flywheel rotor.

10. The energy storage flywheel according to claim 9, characterized in that: The bottom plate is also provided with an upwardly protruding support seat, the top surface of the support seat is flush with the stator magnet of the axial magnetic bearing, the outer support plate includes a first section and a second section, the first section is located between the stator magnet of the axial magnetic bearing and the rotor magnet of the axial magnetic bearing, the second section is located between the flywheel rotor and the support seat, and the second section is bent downward relative to the first section.

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