Energy storage flywheel

Abstract

The energy storage flywheel comprises a motor module, a flywheel module and a centering assembly, the motor module comprises a motor shell and a driving motor, the flywheel module comprises a flywheel shell and a flywheel rotor, and an annular groove is formed in the connecting end of the flywheel shell and the motor module; the connecting end of the motor shell and the flywheel shell is provided with an annular protrusion, the central axis of the groove and the central axis of the flywheel rotor are collinear, the central axis of the protrusion and the central axis of the output shaft of the driving motor are collinear, and the centering assembly comprises a first permanent magnet ring and a second permanent magnet ring. The first permanent magnet ring is arranged at the end, facing the flywheel shell, of the motor shell and annularly extends, the second permanent magnet ring is arranged at the end, facing the motor shell, of the flywheel shell and annularly extends, and the first permanent magnet ring and the second permanent magnet ring are equal in diameter and are both Halbach permanent magnet arrays. According to the energy storage flywheel, automatic centering can be achieved when the motor shell and the flywheel shell are assembled, manual adjustment is not needed, and the assembling efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment technology, and more specifically, to an energy storage flywheel. Background Technology

[0002] Flywheel energy storage systems are electromechanical energy conversion devices. The basic principle of flywheel energy storage is the conversion between electrical energy and the kinetic energy of a rotating body: during the energy storage phase, an electric motor drives the flywheel to accelerate, converting electrical energy into mechanical energy; during the energy release phase, the electric motor operates as a generator, while the flywheel motor decelerates, converting mechanical energy back into electrical energy for output. Flywheel energy storage systems are mechanical energy storage systems with broad application prospects, possessing advantages such as high energy density, strong adaptability, wide application range, high efficiency, long lifespan, no pollution, and low maintenance costs.

[0003] In related technologies, to achieve transmission between the motor and the flywheel rotor, one approach is to adopt an integrated structure for the flywheel rotor and motor rotor. These are either manufactured as a single unit or directly mechanically connected and housed in the same high-vacuum environment. However, the heat loss from the motor rotor is transferred to the entire flywheel rotor, making heat dissipation a challenge and affecting the long-term operational safety of the flywheel energy storage system. Another approach is to divide the flywheel into a motor section and a rotor section, using a magnetic coupling for transmission. However, assembling the motor and rotor sections requires alignment adjustments, resulting in low assembly efficiency, especially for the hoisting of large flywheels, significantly increasing the workload. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose an energy storage flywheel that can achieve initial alignment by using protrusions on the motor housing and grooves on the flywheel housing, and achieve precise alignment by using the alignment and adsorption of a first permanent magnet ring on the motor housing and a second permanent magnet ring on the flywheel housing, without the need for manual alignment adjustment, thereby improving assembly efficiency and accuracy.

[0006] The energy storage flywheel of this invention includes: a motor module and a flywheel module. The motor module includes a motor housing and a drive motor disposed within the motor housing. The flywheel module includes a flywheel housing and a flywheel rotor disposed within the flywheel housing. An annular groove is provided on the outer surface of the connection end between the flywheel housing and the motor housing. An annular protrusion is provided at the connection end between the motor housing and the flywheel housing, which is in clearance fit with the annular groove. The central axis of the annular groove is collinear with the central axis of the flywheel rotor, and the central axis of the annular protrusion is collinear with the central axis of the output shaft of the drive motor. A centering assembly includes a first permanent magnet ring and a second permanent magnet ring. The first permanent magnet ring is disposed at one end of the motor housing facing the flywheel housing and extends annularly along the circumference of the annular protrusion. The second permanent magnet ring is disposed at one end of the flywheel housing facing the motor housing and extends annularly along the circumference of the annular groove. The first permanent magnet ring and the second permanent magnet ring have the same diameter and are both Halbach permanent magnet arrays.

[0007] In this embodiment of the energy storage flywheel, the outer surface of the connection end between the flywheel housing and the motor module is provided with an annular groove, and the connection end between the motor housing and the flywheel housing is provided with an annular protrusion that fits with the groove with a clearance. The central axis of the annular groove is collinear with the central axis of the flywheel rotor, and the central axis of the annular protrusion is collinear with the central axis of the output shaft of the drive motor. The centering assembly includes a first permanent magnet ring and a second permanent magnet ring. The first permanent magnet ring is disposed at the end of the motor housing facing the flywheel housing and extends annularly along the circumference of the annular protrusion. The second permanent magnet ring is located at the end of the flywheel housing facing the motor housing and extends circumferentially along the annular groove. The first permanent magnet ring and the second permanent magnet ring have the same diameter and are both Halbach permanent magnet arrays. Thus, the annular protrusion on the motor housing and the annular groove on the flywheel housing can achieve initial alignment during assembly, and precise alignment can be achieved by the alignment and adsorption of the first permanent magnet ring on the motor housing and the second permanent magnet ring on the flywheel housing, without the need for manual alignment adjustment, thereby improving assembly efficiency and accuracy.

[0008] In some embodiments, the first permanent magnet is disposed on the annular protrusion, and the second permanent magnet is disposed on the bottom wall of the annular groove.

[0009] In some embodiments, the inner circumferential surface of the annular protrusion is provided with a first slot extending circumferentially thereon, and the bottom wall of the annular groove is provided with a second slot extending circumferentially thereon. The first permanent magnet is disposed in the first slot, and the second permanent magnet is disposed in the second slot.

[0010] In some embodiments, the first slot is formed on the end face of the annular protrusion facing the annular groove.

[0011] In some embodiments, the motor housing has a first connecting hole at one end facing the flywheel housing, and the flywheel housing has a second connecting hole opposite to the first connecting hole on its end face facing the motor housing. The first connecting hole and the second connecting hole are connected by a self-locking bolt. The motor housing has a plurality of outwardly horizontally extending connecting lugs at one end facing the flywheel housing. The plurality of connecting lugs are arranged at intervals along the circumference of the motor housing, and each connecting lug has at least one of the first connecting holes.

[0012] In some embodiments, the annular groove is provided with a shape memory alloy inner sleeve extending circumferentially within it, and at room temperature, the inner diameter of the shape memory alloy inner sleeve is larger than the outer diameter of the annular protrusion, and the outer diameter of the shape memory alloy inner sleeve is equal to the radial dimension of the annular groove.

[0013] In some embodiments, at room temperature, the gap between the shape memory alloy inner sleeve and the annular protrusion is s, and the height of the protrusion during the phase transformation of the shape memory alloy inner sleeve is h, then 1.2≤h / s≤1.5 is satisfied.

[0014] In some embodiments, the shape memory alloy inner sleeve is made of Ti-Ni based high-temperature shape memory alloy; and / or the height dimension d of the annular protrusion is less than the depth L of the groove.

[0015] In some embodiments, a vision sensor is provided on the motor housing and / or the flywheel housing, and the vision sensor has a built-in wireless signal transmission module.

[0016] In some embodiments, the upper surface of the flywheel housing is provided with a plurality of locking members arranged circumferentially. Each locking member includes an electromagnetic drive, a locking pin, a support, and a return spring. The support is connected to the flywheel housing. The locking pin passes through the support and is movable radially along the flywheel rotor. The electromagnetic drive is disposed on the flywheel housing and arranged at intervals on the outer side of the locking pin. The return spring is connected between the locking pin and the support. The locking pin is made of ferromagnetic material, and the plurality of locking members are opposite to the plurality of connecting lugs radially on the flywheel rotor. After the flywheel housing and the motor housing are assembled, the connecting lugs are clamped between the locking pin and the upper surface of the motor housing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the energy storage flywheel according to an embodiment of the present invention.

[0018] Figure 2This is a bottom view of the motor housing of the energy storage flywheel according to an embodiment of the present invention.

[0019] Figure 3 This is a partial enlarged view of the energy storage flywheel according to an embodiment of the present invention.

[0020] Figure label: 1. Motor housing; 2. Annular protrusion; 3. Drive motor; 4. Flywheel housing; 5. Flywheel rotor; 6. Annular groove; 7. First permanent magnet ring; 8. Second permanent magnet ring; 9. Self-locking bolt; 10. Connecting lug; 11. Memory alloy inner sleeve; 12. Vision sensor. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] like Figures 1-3 As shown, the energy storage flywheel according to an embodiment of the present invention includes a motor module, a flywheel module, and a centering component.

[0023] Specifically, the motor module includes a motor housing 1 and a drive motor 3 disposed within the motor housing 1. The flywheel module includes a flywheel housing 4 and a flywheel rotor 5 disposed within the flywheel housing 4. The outer surface of the connection end between the flywheel housing 4 and the motor housing 1 is provided with an annular groove 6. The connection end between the motor housing 1 and the flywheel housing 4 is provided with an annular protrusion 2 that is clearance-fitted with the annular groove 6. The central axis of the annular groove 6 is collinear with the central axis of the flywheel rotor 5. The central axis of the annular protrusion 2 is collinear with the central axis of the output shaft of the drive motor 3. The centering assembly includes a first permanent magnet ring 7 and a second permanent magnet ring 8. The first permanent magnet ring 7 is disposed at the end of the motor housing 1 facing the flywheel housing 4 and extends annularly along the circumference of the annular protrusion 2. The second permanent magnet ring 8 is disposed at the end of the flywheel housing 4 facing the motor housing 1 and extends annularly along the circumference of the annular groove 6. The first permanent magnet ring 7 and the second permanent magnet ring 8 have the same diameter and are both Halbach permanent magnet arrays.

[0024] In this regard, when assembling the flywheel assembly, the annular protrusion 2 of the motor housing 1 can be initially positioned and roughly aligned with the annular groove 6. Considering the feasibility of assembly, a certain gap is left between the annular protrusion 2 and the annular groove 6. Therefore, there is a certain amount of error in the alignment of the motor housing 1 and the flywheel housing 4. The adsorption alignment of the first permanent magnet ring 7 and the second permanent magnet ring 8 can further and accurately adjust the alignment of the motor housing 1 and the flywheel housing 4. Thus, precise alignment can be achieved under the condition that the annular protrusion 2 and the annular groove 6 have been initially aligned, without the need for manual alignment adjustment, thereby improving assembly efficiency and assembly accuracy.

[0025] In this embodiment of the invention, the energy storage flywheel has an annular groove 6 on the outer surface of the connection end between the flywheel housing 4 and the motor module. The ends of the motor housing 1 and the flywheel housing 4 have annular protrusions 2 that fit with the annular groove 6 with a clearance. The central axis of the annular groove 6 is collinear with the central axis of the flywheel rotor 5, and the central axis of the annular protrusion 2 is collinear with the central axis of the output shaft of the drive motor 3. The centering assembly includes a first permanent magnet ring 7 and a second permanent magnet ring 8. The first permanent magnet ring 7 is located at the end of the motor housing 1 facing the flywheel housing 4 and extends annularly along the circumference of the annular protrusion 2. The second permanent magnet ring... The first permanent magnet ring 7 and the second permanent magnet ring 8 are located at the end of the flywheel housing 4 facing the motor housing 1 and extend in a ring along the circumference of the annular groove 6. The diameters of the first permanent magnet ring 7 and the second permanent magnet ring 8 are equal and both are Halbach permanent magnet arrays. Thus, the annular protrusion 2 provided on the motor housing 1 and the annular groove 6 provided on the flywheel housing 4 can achieve preliminary alignment during assembly. The first permanent magnet ring 7 provided on the motor housing 1 and the second permanent magnet ring 8 provided on the flywheel housing 4 are used to achieve precise alignment by adsorption, eliminating the need for manual alignment adjustment and thus improving assembly efficiency and accuracy.

[0026] In some embodiments, the first permanent magnet ring 7 is disposed on the annular protrusion 2, and the second permanent magnet ring 8 is disposed on the bottom wall of the annular groove 6. Thus, after the flywheel housing 4 and the motor housing 1 are assembled, both the first permanent magnet ring 7 and the second permanent magnet ring 8 are located inside the annular groove 6 and are not exposed to the outside, thus playing a hidden and protective role.

[0027] In some embodiments, the inner circumferential surface of the annular protrusion 2 is provided with a first groove extending circumferentially therefrom, and the bottom wall of the annular groove 6 is provided with a second groove extending circumferentially therefrom. The first permanent magnet ring 7 is disposed in the first groove, and the second permanent magnet ring 8 is disposed in the second groove. Thus, on the one hand, using the grooves to embed the permanent magnet ring can improve the assembly firmness, and on the other hand, it can make the installation of the permanent magnet ring not occupy external space, thus optimizing the spatial layout of the device.

[0028] Optionally, the first slot is formed on the end face of the annular protrusion 2 facing the annular groove 6. For example... Figure 1 As shown, a first slot with an upward-facing annular groove 6 is provided on the lower end surface of the annular protrusion 2, so that the first permanent magnet ring 7 can be directly embedded into the first slot from bottom to top, which facilitates the assembly and disassembly of the first permanent magnet ring 7.

[0029] In other embodiments, the first slot is located at a certain distance from the bottom surface of the annular protrusion 2, that is, the first slot only has a radial opening, so the first permanent magnet ring 7 can be inserted into the first slot from the inside, and the lower side of the first slot can support the first permanent magnet ring 7 to achieve the anti-detachment effect.

[0030] Alternatively, the second slot can also be formed at a certain distance below the annular groove 6, that is, the second slot only has a radial opening, and the second permanent magnet ring 8 can be inserted into the second slot from the inside. The upper and lower sides of the second slot can clamp the second permanent magnet ring to achieve the anti-detachment effect.

[0031] In some embodiments, the motor housing 1 has a first connecting hole at one end facing the flywheel housing 4, and the flywheel housing 4 has a second connecting hole opposite to the first connecting hole on its end face facing the motor housing 1. The first connecting hole and the second connecting hole are connected by a self-locking bolt 9. It is understood that the self-locking bolt 9 can automatically lock after the first connecting hole and the second connecting hole are aligned, eliminating manual operation and further improving assembly efficiency.

[0032] In some embodiments, such as Figure 2 As shown, the motor housing 1 has multiple outwardly extending horizontal connecting lugs 10 at the end facing the flywheel housing 4. The multiple connecting lugs 10 are arranged at intervals along the circumference of the motor housing 1, and each connecting lug 10 has at least one first connecting hole. Thus, the multiple connecting lugs 10 can form multiple connection points between the motor housing 1 and the flywheel housing 4, thereby improving the reliability of their assembly.

[0033] In some embodiments, a shape memory alloy inner sleeve 11 extending circumferentially within the annular groove 6 is provided. At room temperature, the inner diameter of the shape memory alloy inner sleeve 11 is larger than the outer diameter of the annular protrusion 2, and the outer diameter of the shape memory alloy inner sleeve 11 is equal to the radial dimension of the annular groove 6. It should be noted that the shape memory alloy inner sleeve 11 has the characteristic of deforming with temperature changes. Specifically, when the temperature rises to the phase transition critical point, the shape memory alloy inner sleeve 11 will bulge inward, thereby wrapping around and clamping the annular protrusion 2 of the motor housing 1 to achieve further locking.

[0034] In addition, the shape memory alloy inner sleeve 11 of this application can also serve as an auxiliary structure for centering adjustment. Specifically, after the motor housing 1 and the flywheel housing 4 are aligned and assembled, the shape memory alloy inner sleeve 11 can be heated by an external heat source. When the temperature reaches the critical point, the shape memory alloy inner sleeve 11 bulges inward and wraps around the annular protrusion 2 from its entire circumference. Since the deformation of the shape memory alloy inner sleeve 11 is consistent at each position, its deformation can push the annular protrusion 2 toward the center position, thereby achieving centering adjustment.

[0035] Furthermore, when the shape memory alloy inner sleeve 11 functions as a locking structure, there is no need for external heating. Specifically, after the flywheel assembly is completed and put into operation, the flywheel will automatically dissipate heat and heat the shape memory alloy inner sleeve 11, and the shape memory alloy inner sleeve 11 will automatically deform and lock the motor housing 1.

[0036] In some embodiments, at room temperature, the gap between the shape memory alloy inner sleeve 11 and the annular protrusion 2 is s, and the height of the annular protrusion 2 during the phase change of the shape memory alloy inner sleeve 11 is h, then 1.2 ≤ h / s ≤ 1.5 is satisfied. It should be noted that the protrusion height of the shape memory alloy inner sleeve 11 and the reserved initial gap need to be reasonably set. For example, when the ratio of the protrusion height to the initial gap is too small, there may be a risk that the shape memory alloy inner sleeve 11 will not deform sufficiently, resulting in poor locking effect or failure of the centering adjustment function. When the ratio of the protrusion height to the initial gap is too large, there may be a risk that the shape memory alloy inner sleeve 11 will not deform sufficiently, resulting in deformation interference at various positions. The inventors of this application have found through experiments that when the ratio of the protrusion height to the initial gap during the deformation of the shape memory alloy inner sleeve 11 is between 1.2 and 1.5, its locking and centering effect is good, and there is no deformation interference problem.

[0037] Preferably, the shape memory alloy inner sleeve 11 is made of Ti-Ni-based high-temperature shape memory alloy. It should be noted that Ti-Ni-based high-temperature shape memory alloy has the advantages of ultra-high elasticity, high temperature resistance, and corrosion resistance, and has long-term reliability.

[0038] In some embodiments, the height dimension d of the annular protrusion 2 is less than the depth L of the annular groove 6. Therefore, when the motor housing 1 and the flywheel housing 4 are assembled, direct collision between the annular protrusion 2 and the bottom wall of the annular groove 6 can be avoided, thereby avoiding direct collision between the first permanent magnet ring 7 and the second permanent magnet ring 8, and preventing damage to the structural components.

[0039] In some embodiments, a vision sensor 12 is provided on the motor housing 1 and / or the flywheel housing 4, and the vision sensor 12 has a built-in wireless signal transmission module. Thus, during the assembly process, the vision sensor 12 can monitor in real time whether each connection point is properly assembled, and realize signal transmission and remote control through the built-in wireless signal transmission module, further improving the reliability and efficiency of flywheel assembly.

[0040] In some embodiments, the upper surface of the flywheel housing 4 is provided with a plurality of locking members arranged circumferentially. The locking members include an electromagnetic drive, a locking pin, a support, and a return spring. The support is connected to the flywheel housing 4. The locking pin passes through the support and is movable radially along the flywheel rotor 5. The electromagnetic drive is provided on the flywheel housing 4 and is arranged at intervals on the outside of the locking pin. The return spring is connected between the locking pin and the support. The locking pin is made of ferromagnetic material. The plurality of locking members are opposite to the plurality of connecting lugs 10 in the radial direction of the flywheel rotor. After the flywheel housing 4 and the motor housing 1 are assembled, the connecting lugs 10 are clamped between the locking pin and the upper surface of the motor housing 1.

[0041] Understandably, before assembling the flywheel housing 4 and the motor housing 1, the electromagnetic drive can be energized to generate magnetic force. The magnetic force can attract the locking pin to move outward, making room for the connecting lug 10. During the movement of the locking pin, the return spring will be compressed. After the motor housing 1 is installed in place, the electromagnetic drive is de-energized, and the return spring rebounds, which can drive the locking pin to return to its original position and lock it above the connecting lug 10. At this time, the locking pin and the connecting lug 10 can form a stop and lock, further improving the stability of the assembly of the flywheel housing 4 and the motor housing 1.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a connection that allows communication between them; 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of 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. "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.

[0046] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled 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: The motor module includes a motor housing and a drive motor disposed within the motor housing. The flywheel module includes a flywheel housing and a flywheel rotor disposed within the flywheel housing. The outer surface of the connection end between the flywheel housing and the motor housing is provided with an annular groove. The connection end between the motor housing and the flywheel housing is provided with an annular protrusion that fits with the groove with a clearance. The central axis of the annular groove is collinear with the central axis of the flywheel rotor, and the central axis of the annular protrusion is collinear with the central axis of the output shaft of the drive motor. The centering assembly includes a first permanent magnet ring and a second permanent magnet ring. The first permanent magnet ring is disposed at one end of the motor housing facing the flywheel housing and extends circumferentially along the annular protrusion. The second permanent magnet ring is disposed at one end of the flywheel housing facing the motor housing and extends circumferentially along the annular groove. The first permanent magnet ring and the second permanent magnet ring have the same diameter and are both Halbach permanent magnet arrays.

2. The energy storage flywheel according to claim 1, characterized in that, The first permanent magnet is disposed on the annular protrusion, and the second permanent magnet is disposed on the bottom wall of the annular groove.

3. The energy storage flywheel according to claim 2, characterized in that, The inner circumferential surface of the annular protrusion is provided with a first slot extending circumferentially thereon, and the bottom wall of the annular groove is provided with a second slot extending circumferentially thereon. The first permanent magnet is arranged in the first slot, and the second permanent magnet is arranged in the second slot.

4. The energy storage flywheel according to claim 3, characterized in that, The first slot is formed on the end face of the annular protrusion facing the annular groove.

5. The energy storage flywheel according to claim 1, characterized in that, The motor housing has a first connecting hole at one end facing the flywheel housing, and the flywheel housing has a second connecting hole opposite to the first connecting hole on the end face facing the motor housing. The first connecting hole and the second connecting hole are connected by a self-locking bolt. The motor housing has a plurality of outwardly extending horizontal connecting lugs at one end facing the flywheel housing. The plurality of connecting lugs are arranged at intervals along the circumference of the motor housing, and each connecting lug has at least one first connecting hole.

6. The energy storage flywheel according to any one of claims 1-5, characterized in that, The annular groove is provided with a shape memory alloy inner sleeve that extends circumferentially within it. At room temperature, the inner diameter of the shape memory alloy inner sleeve is larger than the outer diameter of the annular protrusion, and the outer diameter of the shape memory alloy inner sleeve is equal to the radial dimension of the annular groove.

7. The energy storage flywheel according to claim 6, characterized in that, At room temperature, the gap between the shape memory alloy inner sleeve and the annular protrusion is s, and the height of the protrusion during the phase transformation of the shape memory alloy inner sleeve is h, then 1.2≤h / s≤1.5 is satisfied.

8. The energy storage flywheel according to claim 6, characterized in that, The shape memory alloy inner sleeve is made of Ti-Ni based high-temperature shape memory alloy; and / or the height dimension d of the annular protrusion is less than the depth L of the groove.

9. The energy storage flywheel according to claim 1, characterized in that, A vision sensor is provided on the motor housing and / or the flywheel housing, and the vision sensor has a built-in wireless signal transmission module.

10. The energy storage flywheel according to claim 5, characterized in that, The upper surface of the flywheel housing is provided with a plurality of locking members arranged circumferentially. Each locking member includes an electromagnetic drive, a locking pin, a support, and a return spring. The support is connected to the flywheel housing. The locking pin passes through the support and is movable radially along the flywheel rotor. The electromagnetic drive is disposed on the flywheel housing and is arranged at intervals on the outside of the locking pin. The return spring is connected between the locking pin and the support. The locking pin is made of ferromagnetic material. The plurality of locking members are opposite to the plurality of connecting lugs radially on the flywheel rotor. After the flywheel housing and the motor housing are assembled, the connecting lugs are clamped between the locking pin and the upper surface of the motor housing.

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