Energy storage flywheel

Abstract

The application discloses a kind of energy storage flywheel, the energy storage flywheel includes motor module, flywheel module and centering assembly, motor module includes motor shell and drive motor, flywheel module includes flywheel shell and flywheel rotor, the connecting end of flywheel shell with motor module is equipped with annular groove, the connecting end of motor shell with flywheel shell is equipped with annular protrusion, the center axis of groove is collinear with the center axis of flywheel rotor, the center axis of protrusion is collinear with the center axis of the output shaft of drive motor, centering assembly includes first permanent magnet ring and second permanent magnet ring, first permanent magnet ring is located at the end of motor shell towards flywheel shell and extends annularly, second permanent magnet ring is located at the end of flywheel shell towards motor shell and extends annularly, first permanent magnet ring and second permanent magnet ring are equal in diameter and are both Halbach permanent magnet array.The energy storage flywheel of the application can be automatically centered when the motor shell and the flywheel shell are assembled, without manual adjustment, with high assembly efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, in particular to an energy storage flywheel. BACKGROUND

[0002] The flywheel energy storage system is a mechanical energy storage device for electromechanical energy conversion. The basic principle of flywheel energy storage is the conversion between electric energy and kinetic energy of a rotating body. In the energy storage stage, the flywheel is accelerated by a motor to convert electric energy into mechanical energy. In the energy release stage, the motor operates as a generator, and the flywheel motor decelerates to convert mechanical energy into electric energy and output. The flywheel energy storage system is a mechanical energy storage system with broad application prospects, which has the advantages of high energy storage density, strong adaptability, wide application range, high efficiency, long service life, no pollution and low maintenance cost.

[0003] In related technologies, in order to realize the transmission between the motor and the flywheel rotor, one way is to adopt an integrated structure for the flywheel rotor and the motor rotor, and the flywheel rotor and the motor rotor are integrally manufactured or directly mechanically connected to be integrated and arranged in the same high vacuum environment. The heat loss of the motor rotor is transmitted to the entire flywheel rotor, and the heat dissipation is a difficulty, which affects the long-term operation safety of the flywheel energy storage system. Another way is to divide the flywheel into a motor part and a rotor part, and adopt a magnetic coupling for transmission. However, when the motor part and the rotor part are connected and assembled, centering adjustment is needed, which is low in assembly efficiency, especially for hoisting of large flywheels, which greatly increases the workload. SUMMARY

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

[0005] To this end, an embodiment of the present application provides an energy storage flywheel, which can realize preliminary centering by using the protrusions arranged on the motor housing and the grooves arranged on the flywheel housing, and realize precise centering by using the centering adsorption of the first permanent magnet ring arranged on the motor housing and the second permanent magnet ring arranged on the flywheel housing, without manual centering adjustment, thereby improving the assembly efficiency and precision.

[0006] The energy storage flywheel of the embodiment of the application comprises: a motor module and a flywheel module, the motor module comprises a motor shell and a driving motor arranged in the motor shell, the flywheel module comprises a flywheel shell and a flywheel rotor arranged in the flywheel shell, and an annular groove is arranged on the outer surface of the connecting end of the flywheel shell and the motor shell, an annular protrusion is arranged on the connecting end of the flywheel shell and the motor shell and matches with the annular groove, the center axis of the annular groove is collinear with the center axis of the flywheel rotor, and the center axis of the annular protrusion is collinear with the center axis of the output shaft of the driving motor; a centering assembly, the centering assembly comprises a first permanent magnet ring and a second permanent magnet ring, the first permanent magnet ring is arranged on one end of the motor shell facing the flywheel shell and extends in an annular shape along the circumference of the annular protrusion, and the second permanent magnet ring is arranged on one end of the flywheel shell facing the motor shell and extends in an annular shape along the circumference of the annular groove, and the first permanent magnet ring and the second permanent magnet ring are equal in diameter and are both Halbach permanent magnet arrays.

[0007] The energy storage flywheel of the embodiment of the application, an annular groove is arranged on the outer surface of the connecting end of the flywheel shell and the motor module, an annular protrusion is arranged on the connecting end of the flywheel shell and the motor shell and matches with the groove, the center axis of the annular groove is collinear with the center axis of the flywheel rotor, the center axis of the annular protrusion is collinear with the center axis of the output shaft of the driving motor, the centering assembly comprises a first permanent magnet ring and a second permanent magnet ring, the first permanent magnet ring is arranged on one end of the motor shell facing the flywheel shell and extends in an annular shape along the circumference of the annular protrusion, and the second permanent magnet ring is arranged on one end of the flywheel shell facing the motor shell and extends in an annular shape along the circumference of the annular groove, and the first permanent magnet ring and the second permanent magnet ring are equal in diameter and are both Halbach permanent magnet arrays, so that the annular protrusion arranged on the motor shell and the annular groove arranged on the flywheel shell can realize preliminary centering during assembly, and precise centering is realized by the centering adsorption of the first permanent magnet ring arranged on the motor shell and the second permanent magnet ring arranged on the flywheel shell, without manual centering adjustment, thereby improving the assembly efficiency and precision.

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

[0009] In some embodiments, a first clamping groove extending along the circumference of the annular protrusion is arranged on the inner circumferential surface of the annular protrusion, a second clamping groove extending along the circumference of the annular groove is arranged on the bottom wall of the annular groove, the first permanent magnet ring is arranged in the first clamping groove, and the second permanent magnet ring is arranged in the second clamping groove.

[0010] In some embodiments, the first clamping groove is formed on an end surface of the annular protrusion facing the annular groove.

[0011] In some embodiments, the motor housing is provided with a first connecting hole at one end facing the flywheel housing, the flywheel housing is provided with a second connecting hole opposite to the first connecting hole on an end surface facing the motor housing, and the first connecting hole and the second connecting hole are connected by a self-locking bolt; the motor housing is provided with 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 is provided with at least one first connecting hole.

[0012] In some embodiments, the annular groove is provided with a memory alloy inner sleeve extending in a ring shape along the circumference thereof, and in a normal temperature state, the inner diameter of the memory alloy inner sleeve is greater than the outer diameter of the annular protrusion, and the outer diameter of the memory alloy inner sleeve is equal to the radial dimension of the annular groove.

[0013] In some embodiments, in a normal temperature state, the gap between the memory alloy inner sleeve and the annular protrusion is s, and the protruding height of the memory alloy inner sleeve when phase changing is h, and 1.2≤h / s≤1.5 is satisfied.

[0014] In some embodiments, the memory alloy inner sleeve adopts a 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, the motor housing and / or the flywheel housing is provided with a visual sensor, and the visual sensor is internally provided with a wireless signal transmission module.

[0016] In some embodiments, the upper end surface of the flywheel housing is provided with a plurality of locking members arranged at intervals along the circumference thereof, the locking member comprises an electromagnetic driving member, a locking column, a support and a return spring, the support is connected with the flywheel housing, the locking column is arranged on the support and is movable along the radial direction of the flywheel rotor, the electromagnetic driving member is arranged on the flywheel housing and is arranged at intervals on the outer side of the locking column, the return spring is connected between the locking column and the support, the locking column is made of ferromagnetic material, and a plurality of the locking members are opposite to a plurality of the connecting lugs in the radial direction of the flywheel rotor, and the connecting lugs are clamped between the locking column and the upper end surface of the motor housing after the flywheel housing and the motor housing are assembled. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

[0020] Reference signs:

[0021] motor housing 1, annular protrusion 2, drive motor 3, flywheel housing 4, flywheel rotor 5, annular groove 6, first permanent magnet ring 7, second permanent magnet ring 8, self-locking bolt 9, connecting lug 10, memory alloy inner sleeve 11, visual sensor 12. DETAILED DESCRIPTION

[0022] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary and are intended to be illustrative of the present application and are not to be construed as limiting the present application.

[0023] As shown in Figures 1-3 , the energy storage flywheel according to an embodiment of the present application comprises a motor module, a flywheel module and a centering assembly.

[0024] Specifically, the motor module comprises a motor housing 1 and a drive motor 3 arranged in the motor housing 1, the flywheel module comprises a flywheel housing 4 and a flywheel rotor 5 arranged in the flywheel housing 4, and the flywheel housing 4 is provided with an annular groove 6 on the outer surface of the connecting end of the motor housing 1, the connecting end of the motor housing 1 is provided with an annular protrusion 2 which is in clearance fit with the annular groove 6, the center axis of the annular groove 6 is collinear with the center axis of the flywheel rotor 5, the center axis of the annular protrusion 2 is collinear with the center axis of the output shaft of the drive motor 3, the centering assembly comprises a first permanent magnet ring 7 and a second permanent magnet ring 8, the first permanent magnet ring 7 is arranged at one 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 arranged at one 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 are equal in diameter and are both Halbach permanent magnet arrays.

[0025] With this, when assembling the flywheel device, the annular protrusion 2 of the motor housing 1 can be preliminarily assembled, positioned and generally centered with the annular groove 6, considering the feasibility of assembly, there is a certain gap between the annular protrusion 2 and the annular groove 6, so that there is a certain error amount in the centering assembly of the motor housing 1 and the flywheel housing 4, and the adsorption centering of the first permanent magnet ring 7 and the second permanent magnet ring 8 can further accurately adjust the centering degree of the motor housing 1 and the flywheel housing 4, thereby being able to realize accurate centering under the condition that the annular protrusion 2 and the annular groove 6 have been preliminarily centered, without the need for manual centering adjustment, thereby being able to improve the assembly efficiency and assembly precision.

[0026] The energy storage flywheel of the embodiment of the application is provided with an annular groove 6 on the outer surface of the connecting end of the flywheel shell 4 and the motor module, the end of the motor shell 1 and the flywheel shell 4 is provided with an annular protrusion 2 which is in clearance fit 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 driving 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 arranged at the end of the motor shell 1 facing the flywheel shell 4 and extends in an annular shape along the circumference of the annular protrusion 2, the second permanent magnet ring 8 is arranged at the end of the flywheel shell 4 facing the motor shell 1 and extends in an annular shape along the circumference of the annular groove 6, the first permanent magnet ring 7 and the second permanent magnet ring 8 are equal in diameter and are both Halbach permanent magnet arrays, thus, the annular protrusion 2 arranged on the motor shell 1 and the annular groove 6 arranged on the flywheel shell 4 can realize preliminary centering when assembled, and precise centering is realized by the centering adsorption of the first permanent magnet ring 7 arranged on the motor shell 1 and the second permanent magnet ring 8 arranged on the flywheel shell 4, without manual centering adjustment, thereby improving the assembly efficiency and precision.

[0027] In some embodiments, the first permanent magnet ring 7 is arranged on the annular protrusion 2, and the second permanent magnet ring 8 is arranged on the bottom wall of the annular groove 6. Thus, after the flywheel shell 4 and the motor shell 1 are assembled, the first permanent magnet ring 7 and the second permanent magnet ring 8 are both located inside the annular groove 6 and will not be exposed, thereby playing a hidden protection role.

[0028] In some embodiments, the inner circumferential surface of the annular protrusion 2 is provided with a first clamping groove extending along the circumference thereof, the bottom wall of the annular groove 6 is provided with a second clamping groove extending along the circumference thereof, the first permanent magnet ring 7 is arranged in the first clamping groove, and the second permanent magnet ring 8 is arranged in the second clamping groove. Thus, on the one hand, the clamping groove can improve the firmness of the assembly by embedding the permanent magnet ring, and on the other hand, the installation of the permanent magnet ring does not occupy external space, thereby optimizing the spatial layout of the device.

[0029] Optionally, the first clamping groove is formed on the end face of the annular protrusion 2 facing the annular groove 6. As shown in FIG. 5, the first clamping groove of the annular protrusion 2 is arranged on the lower end face and faces upwardly to the annular groove 6, so that the first permanent magnet ring 7 can be directly embedded in the first clamping groove from the lower side to the upper side, thereby facilitating the disassembly and assembly of the first permanent magnet ring 7. Figure 1

[0030] In addition, in other embodiments, the first clamping groove is arranged at a distance from the bottom surface of the annular protrusion 2, that is, the first clamping groove only has a radial opening, and the first permanent magnet ring 7 can be embedded in the first clamping groove from the inside, and the lower side of the first clamping groove can support the first permanent magnet ring 7, thereby achieving the effect of preventing the first permanent magnet ring 7 from falling off.

[0031] ​Optionally, a second clamping groove can also be formed at a distance below the annular groove 6, that is, the second clamping groove only has a radial opening, and the second permanent magnet ring 8 can be embedded in the second clamping groove from the inside, and the upper and lower sides of the second clamping groove can clamp the second permanent magnet ring, thereby achieving the anti-disengagement effect.

[0032] In some embodiments, the motor housing 1 is provided with a first connecting hole at one end facing the flywheel housing 4, and the flywheel housing 4 is provided with a second connecting hole opposite to the first connecting hole on the end surface facing the motor housing 1, and the first connecting hole and the second connecting hole are connected by a self-locking bolt 9. It can be understood that the self-locking bolt 9 can be automatically locked after the first connecting hole and the second connecting hole are aligned, which saves manual operation and further improves the assembly efficiency.

[0033] In some embodiments, as shown in Figure 2 the motor housing 1 is provided with a plurality of outwardly horizontally extending connecting lugs 10 at one end facing the flywheel housing 4, and the plurality of connecting lugs 10 are arranged along the circumference of the motor housing 1, and each connecting lug 10 is provided with at least one first connecting hole. Thus, the plurality of connecting lugs 10 can form multiple connection points between the motor housing 1 and the flywheel housing 4, thereby improving the reliability of the assembly of the two.

[0034] In some embodiments, the annular groove 6 is provided with a memory alloy inner sleeve 11 extending in a ring shape along the circumference thereof, and in a normal temperature state, the inner diameter of the memory alloy inner sleeve 11 is greater than the outer diameter of the annular protrusion 2, and the outer diameter of the memory alloy inner sleeve 11 is equal to the radial dimension of the annular groove 6. It should be noted that the memory alloy inner sleeve 11 has the characteristic of deforming with temperature change, specifically, when the temperature rises to the critical point of phase change, the memory alloy inner sleeve 11 will protrude inward, thereby wrapping and clamping the annular protrusion 2 of the motor housing 1 to achieve further locking.

[0035] In addition, the memory alloy inner sleeve 11 of the present application can also serve as an auxiliary structure for centering adjustment, specifically, after the motor housing 1 and the flywheel housing 4 are assembled in the centering state, the memory alloy inner sleeve 11 can be heated by an external heat source, and when the temperature reaches the critical point, the memory alloy inner sleeve 11 protrudes inward and wraps the annular protrusion 2 from the entire circumference of the annular protrusion 2. Since the deformation amount of each position of the memory alloy inner sleeve 11 is consistent, the deformation can drive the annular protrusion 2 to move towards the central position, thereby achieving centering adjustment.

[0036] Further, when the memory alloy inner sleeve 11 functions as a locking structure, it does not need to be heated by an external heat source, specifically, after the flywheel device is assembled and put into operation, the flywheel operation will automatically heat and heat the memory alloy inner sleeve 11, and the memory alloy inner sleeve 11 will automatically deform to lock the motor housing 1.

[0037] In some embodiments, in the normal temperature state, the gap between the memory alloy inner sleeve 11 and the annular protrusion 2 is s, and the height of the annular protrusion 2 when the memory alloy inner sleeve 11 is transformed is h, then 1.2≤h / s≤1.5 is satisfied. It should be noted that the protrusion height of the memory alloy inner sleeve 11 and the initial gap reserved need to be reasonably set. For example, when the ratio of the protrusion height to the initial gap is too small, there is a risk that the transformation amount of the memory alloy inner sleeve 11 is insufficient, 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 is a risk that the transformation space of the memory alloy inner sleeve 11 is insufficient, resulting in transformation interference at each position. The inventors of the present application have found through experiments that when the ratio of the protrusion height of the memory alloy inner sleeve 11 to the initial gap is between 1.2-1.5, the locking and centering effect is good, and there is no transformation interference problem.

[0038] Preferably, the memory alloy inner sleeve 11 is made of Ti-Ni based high-temperature shape memory alloy. It should be noted that the Ti-Ni based high-temperature shape memory alloy has the advantages of super-elasticity, high-temperature resistance, and corrosion resistance, and has long-term reliability.

[0039] In some embodiments, the height size d of the annular protrusion 2 is smaller than the depth L of the annular groove 6. In this way, when the motor shell 1 and the flywheel shell 4 are assembled, the annular protrusion 2 and the bottom wall of the annular groove 6 can be avoided from directly colliding, thereby avoiding the first permanent magnet ring 7 and the second permanent magnet ring 8 from directly colliding, and avoiding the structural member from being damaged.

[0040] In some embodiments, a visual sensor 12 is arranged on the motor shell 1 and / or the flywheel shell 4, and the visual sensor 12 is internally provided with a wireless signal transmission module. In this way, during the assembly process, the visual sensor 12 can monitor whether each connection is assembled in place in real time, and signal transmission and remote control can be realized through the internally provided wireless signal transmission module, thereby further improving the reliability and assembly efficiency of the flywheel assembly.

[0041] In some embodiments, a plurality of locking members are arranged on the upper end surface of the flywheel shell 4 and spaced apart in the circumferential direction thereof. The locking member includes an electromagnetic driving member, a locking column, a support, and a return spring. The support is connected to the flywheel shell 4, the locking column is movably arranged on the support in the radial direction of the flywheel rotor 5, the electromagnetic driving member is arranged on the flywheel shell 4 and spaced apart from the outside of the locking column, and the return spring is connected between the locking column and the support. The locking column is made of ferromagnetic material, and 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 shell 4 and the motor shell 1 are assembled, the connecting lug 10 is clamped between the locking column and the upper end surface of the motor shell 1.

[0042] It can be understood that before the flywheel shell 4 and the motor shell 1 are assembled, the electromagnetic drive can be powered to generate a magnetic force, the magnetic force can attract the lock post to move outward to leave a mounting space for the connecting lug 10, and the reset spring is compressed during the movement of the lock post, after the motor shell 1 is installed in place, the electromagnetic drive is powered off, the reset spring rebounds to drive the lock post to reset and be clamped above the connecting lug 10, at this time, the lock post and the connecting lug 10 can constitute a stop locking, further improving the stability of the flywheel shell 4 and the motor shell 1.

[0043] In the description of the present application, it should be understood that the 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 indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0045] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, 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 or in communication with each other; 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 the present application can be understood according to the specific circumstances.

[0046] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0047] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. In the specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the described specific features, structures, materials or characteristics can be combined in any suitable manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0048] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An energy storage flywheel, characterized by, 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 in a ring along the circumferential direction of the annular protrusion. The second permanent magnet ring is disposed at one end of the flywheel housing facing the motor housing and extends in a ring along the circumferential direction 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. The annular groove is provided with a shape memory alloy inner sleeve extending 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. When the temperature reaches a critical point, the shape memory alloy inner sleeve protrudes inward and wraps around the entire circumference of the annular protrusion. Since the deformation of the shape memory alloy inner sleeve is consistent at all positions, the deformation of the shape memory alloy inner sleeve pushes the annular protrusion toward the center position, thereby achieving centering adjustment.

2. The energy storage flywheel of claim 1, wherein, 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 of claim 2, wherein, 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 of claim 3, wherein, The first slot is formed on the end face of the annular protrusion facing the annular groove.

5. The energy storage flywheel of claim 1, wherein, 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 of any one of claims 1-5, wherein, 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.

7. The energy storage flywheel of any of claims 1-5, wherein, 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.

8. The energy storage flywheel of claim 1, wherein, 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.

9. The energy storage flywheel of claim 5, wherein, The upper end face of the flywheel housing is provided with a plurality of locking members arranged at intervals along the circumference thereof, the locking member comprising an electromagnetic drive member, a locking post, a support and a return spring, the support being connected with the flywheel housing, the locking post being arranged through the support and being movable along the radial direction of the flywheel rotor, the electromagnetic drive member being arranged on the flywheel housing and being arranged at intervals on the outside of the locking post, the return spring being connected between the locking post and the support, the locking post being a ferromagnetic material member, and a plurality of the locking members being opposite to a plurality of the connecting lugs in the radial direction of the flywheel rotor, the connecting lug being clamped between the locking post and the upper end face of the motor housing after the flywheel housing and the motor housing are assembled.

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