Magnetic suspension energy storage flywheel

Abstract

The invention relates to the technical field of magnetic suspension, in particular to a magnetic suspension energy storage flywheel. The magnetic suspension energy storage flywheel comprises a rotor and two stators, the rotor comprises a rotor shaft and a rotor body, the rotor body is located in the middle of the rotor shaft in the axial direction of the rotor, and the rotor body is of a cylindrical structure; the stators are of a circular ring disc-shaped structure, the two stators are arranged on the rotor shaft in a sleeving mode in the axial direction of the rotor and located at the two ends of the rotor body respectively, and gaps are formed between the stators and the rotor body. Each stator comprises a stator iron core, a torque winding and a suspension winding, and the torque winding and the suspension winding are wound on the stator iron core in the shape of an annular disc. By means of the design, the torque winding capable of enabling the rotor to rotate and the suspension winding capable of enabling the rotor to suspend in the axial direction of the rotor share one stator iron core, occupation of the internal space of the magnetic suspension energy storage flywheel is greatly reduced, and the magnetic suspension energy storage flywheel is compact in structure, highly integrated in function and developed towards miniaturization.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension, and in particular to a magnetic suspension energy storage flywheel. Background Art

[0002] Flywheel energy storage technology refers to the use of an electric motor to drive a flywheel to rotate at high speed, converting electrical energy into kinetic energy and storing it. When electricity is needed, the flywheel is used to drive a generator to generate electricity, converting kinetic energy into electrical energy for use. This energy storage method has the advantages of high power density and long service life.

[0003] Energy storage flywheels can be divided into two types: magnetic levitation energy storage flywheels and mechanical energy storage flywheels. Among them, magnetic levitation energy storage flywheels have the advantages of less mechanical wear, high conversion efficiency, low noise, etc. compared with mechanical bearing energy storage flywheels, and have higher energy utilization efficiency, so they are widely used in power generation.

[0004] However, the internal structure of the current magnetic levitation energy storage flywheel is not compact enough, resulting in a waste of internal space, which is not conducive to the miniaturization of the magnetic levitation energy storage flywheel. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present invention provides a magnetic suspension energy storage flywheel, which does not affect the performance while improving the space utilization.

[0006] According to some embodiments, a magnetic levitation energy storage flywheel is provided, comprising: A rotor, wherein the rotor comprises a rotor shaft and a rotor body, wherein the rotor body is located in the middle of the rotor shaft in the axial direction and is a cylindrical structure; Two stators, each of which is in the shape of an annular disk. In the axial direction of the rotor, the two stators are both sleeved on the rotor shaft and are respectively located at the two ends of the rotor body, and there is a gap between the stator and the rotor body; each of the stators includes a stator core, a torque winding and a suspension winding, and the torque winding and the suspension winding are both wound on the stator core in the shape of an annular disk.

[0007] In some embodiments of the present invention, the stator core is provided with a plurality of through holes extending in a radial direction of the stator core, the through holes are not penetrated in an axial direction of the stator core, the torque winding and the suspension winding are passed through the through holes and are wound on the stator core, wherein, in the axial direction of the stator core, the suspension winding is arranged closer to the rotor body than the torque winding.

[0008] In some embodiments of the present invention, the rotor also includes a plurality of permanent magnets, which are fan-shaped structures. The plurality of permanent magnets are evenly embedded on the two end faces of the rotor body along the circumferential direction, and the surface of one side of the permanent magnet close to the stator core is flush with the end face of the rotor body.

[0009] In some embodiments of the present invention, the magnetic levitation energy storage flywheel also includes two protective bearings, both of which are fixedly connected to the shell, and both of which are sleeved on the rotor shaft and are respectively located at both ends of the rotor body in the axial direction.

[0010] In some embodiments of the present invention, the magnetic levitation energy storage flywheel also includes two radial magnetic bearings, both of which are sleeved on the rotor shaft and are respectively arranged at both ends of the rotor body in the axial direction of the rotor shaft. In the radial direction of the rotor shaft, the distance between the inner circumferential surface of the radial magnetic bearing and the rotor shaft is greater than the distance between the inner circumferential surface of the protective bearing and the rotor shaft.

[0011] In some embodiments of the present invention, a plurality of recessed structures are provided on the inner circumferential surface of the protective bearing and / or on two annular surfaces perpendicular to the axial direction of the protective bearing.

[0012] In some embodiments of the present invention, the cross-sectional area of ​​the recessed structure is related to the material density of the rotor body, the radius of the rotor body, the height of the rotor body, the angular velocity of rotation of the rotor body, the elastic modulus of the protective bearing, and the deformation of the protective bearing.

[0013] In some embodiments of the present invention, the number of the recessed structures is less than or equal to the ratio of the contact area between the protective bearing and the rotor to the cross-sectional area of ​​the recessed structures.

[0014] In some embodiments of the present invention, the magnetic levitation energy storage flywheel also includes two groups of displacement sensor components, which are respectively arranged at both ends of the rotor shaft along its axial direction, and the displacement sensor components are electrically connected to the controller, and the controller is electrically connected to the suspension winding and the torque winding. The displacement sensor components are used to detect the position change of the rotor, and the controller is used to receive the signals of the displacement sensor components and control the current in the suspension winding and the torque winding.

[0015] In some embodiments of the present invention, each set of displacement sensor assemblies includes a mounting seat, an axial displacement sensor and at least two sets of radial displacement sensors. Wherein, the mounting seat is in a circular ring structure and is sleeved on the rotor shaft, and the axial displacement sensor and the radial displacement sensor are both arranged on the inner circumferential surface of the mounting seat; Each group of the radial displacement sensors includes two radial displacement sensors that are arranged opposite to each other on the mounting seat, and a plurality of the radial displacement sensors are evenly arranged on the inner circumferential surface of the mounting seat.

[0016] The technical solution provided by the embodiments of the present invention may have the following beneficial effects: The present invention provides a magnetic levitation energy storage flywheel, in which a stator is respectively arranged at both ends of a rotor along its axial direction, each stator includes a stator core, a torque winding and a suspension winding, and the torque winding capable of rotating the rotor and the suspension winding capable of suspending the rotor in its axial direction share a stator core, which greatly reduces the occupation of the internal space of the magnetic levitation energy storage flywheel, improves the space utilization rate, makes the internal structure of the magnetic levitation energy storage flywheel compact, and highly integrated in function, which is conducive to the miniaturization of the magnetic levitation energy storage flywheel.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] Figure 1 is a cross-sectional view of a magnetic suspension energy storage flywheel according to an exemplary embodiment; Figure 2 yes Figure 1 Schematic diagram of the structure of the stator core; Figure 3 yes Figure 1 Schematic diagram of the layout of the torque winding; Figure 4 yes Figure 1 Schematic diagram of the layout of the suspended winding; Figure 5 yes Figure 1 Schematic diagram of the structure of the middle rotor; Figure 6 yes Figure 1 Schematic diagram of the structure of the middle protection bearing; Figure 7 yes Figure 1 Schematic diagram of the structure of the displacement sensor component.

[0020] Reference numerals: 100, rotor; 110, rotor shaft; 120, rotor body; 130, permanent magnet; 200, stator; 210, stator core; 2110, through hole; 220, torque winding; 230, suspension winding; 300, protecting the bearing; 310, recessed structure; 400, radial magnetic bearing; 500, displacement sensor assembly; 510, mounting seat; 520, axial displacement sensor; 530, radial displacement sensor; 600, shell; 610, first end cover; 620, second end cover; 630, first flywheel house; 640, second flywheel house; 650, third flywheel house. DETAILED DESCRIPTION

[0021] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0022] Flywheel energy storage technology is a way of energy storage and power generation. When the motor is working, the magnetic field generated by the torque winding interacts with the magnetic field generated by the permanent magnet to generate torque, drive the rotor to rotate at high speed, and convert electrical energy into kinetic energy of the rotor for storage; when electricity is needed, the magnetic field of the permanent magnet cuts the torque winding during the rotation of the rotor, generates electromotive force and then generates current, converts kinetic energy into electrical energy for use. Flywheel energy storage technology has the advantages of high power density, high charging and discharging efficiency, long service life and no pollution to the environment. Energy storage flywheels can be divided into two types: magnetic levitation energy storage flywheels and mechanical energy storage flywheels. Among them, the rotor of the magnetic levitation energy storage flywheel does not contact the bearing during the rotation process, so compared with the mechanical bearing energy storage flywheel, it has the advantages of less mechanical wear, high conversion efficiency and low noise, and higher energy utilization efficiency, so it is widely used in the field of power generation. However, the internal structure of the current magnetic levitation energy storage flywheel is not compact enough, resulting in a waste of internal space, which is not conducive to the miniaturization of magnetic levitation energy storage flywheels.

[0023] In order to solve the above technical problems, the present invention provides a magnetic levitation energy storage flywheel, by arranging a stator at both ends of the rotor along its axial direction, each stator includes a stator core, a torque winding and a suspension winding, the torque winding that can make the rotor rotate and the suspension winding that can make the rotor suspend in its axial direction share a stator core, which greatly reduces the occupation of the internal space; based on the pseudo-rigid body theory of the compliant mechanism, the protective bearing is designed to improve its protection effect; in addition, the displacement sensor is integrated, and the above arrangement improves the space utilization rate of the magnetic levitation energy storage flywheel, so that the internal structure of the magnetic levitation energy storage flywheel is compact and the functions are highly integrated, which is conducive to the miniaturization of the magnetic levitation energy storage flywheel.

[0024] A magnetic suspension energy storage flywheel provided according to the present invention is described in detail below in conjunction with the accompanying drawings.

[0025] It should be noted that Figures 1 to 7 The plane direction of the x-axis and y-axis is the radial direction of the rotor 100, and is also the radial direction of the stator 200, the protective bearing 300, and the radial magnetic bearing 400. The z-axis direction is the axial direction of the rotor 100, and is also the axial direction of the stator 200, the protective bearing 300, and the radial magnetic bearing 400.

[0026] The embodiment of the present invention provides a magnetic suspension energy storage flywheel, such as Figure 1 and Figure 5 As shown, the magnetic levitation energy storage flywheel includes a shell 600, a rotor 100 and two stators 200, wherein, in the z-axis direction, the shell 600 includes a first flywheel house 630, a second flywheel house 640 and a third flywheel house 650, which are all cylindrical structures and are arranged in sequence along the axial direction, the first end cover 610 is arranged on the first flywheel house 630, the second end cover 620 is arranged on the third flywheel house 650, the diameters of the first flywheel house 630 and the third flywheel house 650 are smaller than the diameter of the second flywheel house 640, the rotor 100 includes a rotor shaft 110 and a rotor body 120, in the z-axis direction, the rotor body 120 is located in the middle of the rotor shaft 110, the rotor body 120 is arranged in the second flywheel house 640, and the rotor body 120 is a cylindrical structure.

[0027] Two stators 200 are also arranged in the second flywheel house 640. The stators 200 are in a disc-shaped ring structure. The two stators 200 are sleeved on the rotor shaft 110 and are respectively located at two ends of the rotor body 120 in the axial direction of the rotor 100 (i.e., the z-axis direction in the figure). There is a gap between the stator 200 and the rotor body 120, and when the rotor 100 operates normally, there is also a gap between the inner circumferential surface of the stator 200 and the rotor shaft 110; each stator 200 includes a stator core 210, a torque winding 220 and a suspension winding 230, and the torque winding 220 and the suspension winding 230 are both wound on the stator core 210.

[0028] In this embodiment, a stator 200 is provided at each end of the rotor 100 along its axial direction, each stator 200 includes a stator core 210, a torque winding 220 and a suspension winding 230. The torque winding 220 that can rotate the rotor 100 and the suspension winding 230 that can suspend the rotor 100 in its axial direction share a stator core 210, which greatly reduces the occupation of the internal space, improves the space utilization rate of the magnetic levitation energy storage flywheel, and makes the magnetic levitation energy storage flywheel compact in structure, highly integrated in function, and develops towards miniaturization.

[0029] It should be noted that the magnetic field generated by the torque winding 220 is a rotating alternating magnetic field, and the magnetic field generated by the suspension winding 230 is an axial DC magnetic field. When the two windings share a stator core 210, it is only necessary to ensure that the stator core 210 does not have a local magnetic flux saturation phenomenon, and the two magnetic fields will not affect each other. The local magnetic flux saturation phenomenon refers to the phenomenon that the magnetic flux density in a local area of ​​a magnetic material reaches a maximum value under the action of a magnetic field, resulting in a significant decrease in the magnetic permeability of the area. Methods for avoiding the local magnetic flux saturation phenomenon include: designing a magnetic circuit structure with uniform magnetic flux distribution, opening an air gap on the magnetic circuit structure to limit the flow of magnetic flux; selecting a core material with high magnetic permeability and strong anti-saturation ability; reducing the load to avoid local magnetic flux saturation caused by excessive current and load; improving operating conditions, such as setting a heat dissipation structure to reduce the operating temperature.

[0030] In some embodiments, Figure 2 As shown, the stator core 210 is an annular structure, and a plurality of through holes 2110 are opened along the radial direction of the stator core 210. The through holes 2110 are not penetrated in the axial direction of the stator core 210. The torque winding 220 and the suspension winding 230 are both wound on the stator core 210 through the through holes 2110. In the z-axis direction, the suspension winding 230 is arranged closer to the rotor body 120 than the torque winding 220. In another embodiment, in the z-axis direction, the torque winding 220 is arranged closer to the rotor body 120 than the suspension winding 230, both of which are within the protection scope of the present invention.

[0031] By providing a ring-shaped stator core 210 and winding the torque winding 220 and the suspension winding 230 on the stator core 210 in two layers, the internal space occupied by the magnetic suspension energy storage flywheel is further reduced.

[0032] In one embodiment, Figure 3 FIG. 2 shows a schematic diagram of the layout of the torque winding 220. Figure 4 FIG. 2 shows a schematic diagram of the layout of the suspension winding 230. It should be noted that: Figure 3 and Figure 4 It only shows the connection relationship between the torque winding 220 and the suspension winding 230. In order to distinguish the two windings, they are marked as inner and outer rings. When the windings are actually arranged, they are not divided into inner and outer rings for winding, but are divided into upper and lower layers along the axial direction of the stator core 210.

[0033] In one embodiment, if Figure 5As shown, the rotor 100 also includes a plurality of permanent magnets 130, which are arranged on the two end surfaces of the rotor body 120. The permanent magnets 130 are fan-shaped structures, and the radial length from the inner circumferential surface to the outer circumferential surface of the permanent magnet 130 is smaller than the radius of the rotor body 120. The plurality of permanent magnets 130 are evenly embedded on the two end surfaces of the rotor body 120 along the circumferential direction, and the surface of one side of the permanent magnet 130 close to the stator core 210 is flush with the end surface of the rotor body 120.

[0034] By arranging multiple permanent magnets 130 at intervals on the rotor body 120, compared with a whole ring-shaped permanent magnet, the bending stress on the permanent magnet 130 when the rotor 100 rotates at high speed can be reduced, thereby avoiding the permanent magnet 130 from breaking; by embedding the permanent magnet 130 into the rotor body 120, the permanent magnet 130 is avoided from detaching from the rotor body 120 under the action of centrifugal force to cause danger, thereby improving the safety and structural strength of the magnetic levitation energy storage flywheel during operation.

[0035] In some embodiments, Figure 1 and Figure 5 As shown, the rotor body 120 is formed by laminating silicon steel sheets, the stator core 210 is made of soft magnetic composite materials, and the permanent magnet 130 is made of rare earth permanent magnet material. Those skilled in the art can select the materials of the above structure according to actual needs, and no limitation is made here.

[0036] In one embodiment, reference Figure 1 and Figure 6 The magnetic suspension energy storage flywheel also includes two protective bearings 300, which are fixedly connected to the housing 600 and are respectively arranged in the first flywheel house 630 and the third flywheel house 650. The two protective bearings 300 are sleeved on the rotor shaft 110 and are respectively located at both ends of the axial direction of the rotor body 120. The protective bearings 300 are made of high-strength materials such as alloy materials to withstand the impact force of the high-speed rotating rotor 100, and also have good high temperature resistance, corrosion resistance and other characteristics.

[0037] By providing protective bearings 300 at both ends of the rotor shaft 110, when the rotor 100 loses stability, the rotor shaft 110 first contacts the protective bearings 300, and the protective bearings 300 absorb the impact energy of the rotor 100, thereby protecting other structures in the magnetic levitation energy storage flywheel.

[0038] In one embodiment, if Figure 1As shown, the magnetic levitation energy storage flywheel also includes two radial magnetic bearings 400, which are fixedly connected to the shell 600 and are respectively arranged in the first flywheel house 630 and the third flywheel house 650. The two radial magnetic bearings 400 are both sleeved on the rotor shaft 110 and are respectively arranged at both ends of the rotor body 120 in the axial direction of the rotor shaft 110. In the radial direction of the rotor shaft 110, the distance between the inner circumferential surface of the radial magnetic bearing 400 and the rotor shaft 110 is greater than the distance between the inner circumferential surface of the protective bearing 300 and the rotor shaft 110.

[0039] With such a design, the radial magnetic bearing 400 is used to ensure the radial suspension of the rotor, and by setting the distance between the inner circumference of the radial magnetic bearing 400 and the rotor shaft 110 to be greater than the distance between the inner circumference of the protective bearing 300 and the rotor shaft 110, it is ensured that when the rotor 100 loses stability, it will first contact the protective bearing 300, and will not cause damage to the radial magnetic bearing 400.

[0040] In an exemplary embodiment, Figure 6 As shown, a plurality of recessed structures 310 are provided on the inner circumferential surface or the two annular surfaces of the protective bearing 300, or a plurality of recessed structures 310 are provided on the inner circumferential surface and the two annular surfaces, wherein the two annular surfaces of the protective bearing 300 refer to two surfaces perpendicular to the axial direction of the protective bearing 300.

[0041] In this embodiment, by setting the recessed structure 310, the protective bearing 300 will produce greater elastic deformation when impacted, absorb more impact energy, and can quickly realize the storage and transfer of impact energy when the large inertia rotor becomes unstable, thereby achieving a better shock absorption effect.

[0042] In one embodiment, continue to refer to Figure 6 The cross-sectional area of ​​the recessed structure 310 is related to the material density of the rotor body 120, the radius of the rotor body 120, the height of the rotor body 120, the angular velocity of the rotor body 120, the elastic modulus of the protective bearing 300, and the deformation of the protective bearing 300. The cross-sectional area of ​​the recessed structure 310 refers to the area of ​​the cross section located on the surface of the protective bearing 300. For example, Figure 6 The cross-sectional area of ​​the recessed structure 310 opening toward the z-axis direction is the area of ​​the surface of the recessed structure 310 on the x-axis and y-axis planes and flush with the annular surface of the protective bearing 300 perpendicular to the z-axis direction; for another example, Figure 6 The cross-sectional area of ​​the recessed structure 310 opening toward the axial direction of the protective bearing 300 is the area of ​​the surface of the recessed structure 310 flush with the inner annular surface of the protective bearing 300; the cross-section of the recessed structure 310 can be a plane or a curved surface, which is not limited here.

[0043] In one embodiment, continue to refer to Figure 6 , the number of the recessed structures 310 is less than or equal to the ratio of the contact area between the protective bearing 300 and the rotor 100 to the cross-sectional area of ​​the recessed structures 310 .

[0044] The derivation process of the parameter setting of the recessed structure 310 is as follows: The energy W possessed by the rotor 100 during operation f The calculation method is as follows:

[0045] Wherein: ρ is the material density of the rotor body 120 , r is the radius of the rotor body 120 , h is the height of the rotor body 120 , and ω is the rotational angular velocity of the rotor body 120 .

[0046] Protect bearing 300 deformation can absorb energy W s The calculation method is as follows:

[0047] Wherein: k is the elastic coefficient of the protective bearing 300, and s is the deformation of the protective bearing 300.

[0048] When the energy of the rotor 100 is equal to the energy that can be absorbed by the deformation of the protective bearing 300 material, the protective bearing 300 is designed to be qualified. At this time, the elastic coefficient k of the protective bearing 300 is:

[0049] The minimum number N of the recessed structures 310 calculated according to the relationship between the elastic modulus E of the protective bearing 300 and the elastic coefficient k of the protective bearing 300 is:

[0050] To ensure the protective effect of the bearing 300, the number M of the recessed structures 310 should satisfy:

[0051] The cross-sectional area A of the recessed structure 310 should satisfy:

[0052] In some embodiments, the cross section of the recessed structure 310 is designed to be circular. The recessed structure 310 with a circular cross section can ensure isotropy, evenly disperse the impact load of the rotor 100 when the protective bearing 300 is impacted by the rotor 100, avoid excessive concentration of local load on the protective bearing 300, and further improve the protective effect of the protective bearing 300.

[0053] In one embodiment, if Figure 1 and Figure 7As shown, the magnetic suspension energy storage flywheel also includes two groups of displacement sensor components 500, both of which are fixedly connected to the shell 600 and are respectively arranged in the first flywheel room 630 and the third flywheel room 650, and the two groups of displacement sensor components 500 are respectively arranged at both ends of the rotor shaft 110 along its axial direction, and the displacement sensor components 500, the suspension winding 230, the torque winding 220 and the radial magnetic bearing 400 are all electrically connected to the controller (not shown in the figure), and the displacement sensor components 500 are used to detect the position changes of the rotor 100 in the radial and axial directions and send signals to the controller, and the controller adjusts the operating state of the magnetic suspension energy storage flywheel according to the signal.

[0054] Specifically, the working process of the displacement sensor assembly 500 in this embodiment to achieve stable suspension of the rotor 100 is as follows: When the rotor 100 becomes unstable and moves along the z-axis, the air gap between the rotor body 120 and the two stators 200 will change. After the displacement sensor component 500 detects this movement, it sends a signal to the controller. The controller will adjust the current size and direction of the suspension winding 230 and the torque winding 220 according to the signal of the displacement sensor, and then adjust the suspension magnetic field synthesized by the magnetic field of the suspension winding 230 and the magnetic field of the permanent magnet 130 and the force of the magnetic field of the torque winding 220 on the rotor 100, thereby achieving stable suspension of the rotor 100 in the z-axis direction.

[0055] When the rotor 100 becomes unstable and moves in the axial direction, the air gap between the rotor body 120 and the two radial magnetic bearings 400 will change. After the displacement sensor assembly 500 detects this movement, it sends a signal to the controller. The controller adjusts the current size and direction of the radial magnetic bearings 400 and the torque winding 220 according to the signal of the displacement sensor, and then adjusts the force of the radial magnetic bearings 400 and the torque winding 220 on the rotor 100, thereby achieving stable suspension of the rotor 100 in the axial direction.

[0056] In this embodiment, a displacement sensor assembly 500 is provided to detect the displacement of the rotor 100 in the axial direction and the radial direction. When the displacement is detected, a signal is sent to the controller to adjust the current size or direction of the winding, thereby adjusting the magnetic field, thereby achieving timely adjustment of the position of the rotor 100.

[0057] In some embodiments, Figure 7As shown, each displacement sensor assembly 500 includes a mounting seat 510, an axial displacement sensor 520 and at least two groups of radial displacement sensors 530. The mounting seat 510 is provided with a plurality of hollow structures to reduce the weight of the mounting seat 510. In this embodiment, the radial displacement sensors 530 are arranged along the x-axis direction and the y-axis direction, and there are two groups in total. In order to more accurately detect the movement of the position of the rotor 100 in the radial direction, the radial displacement sensors 530 can also be arranged in three groups or four groups, which are all within the protection scope of the present application and will not be described in detail here.

[0058] Among them, the mounting seat 510 is in a circular ring structure and is sleeved on the rotor shaft 110. The axial displacement sensor 520 and the radial displacement sensor 530 are both arranged on the inner circumferential surface of the mounting seat 510. Each group of radial displacement sensors 530 includes two radial displacement sensors 530 arranged opposite to each other on the mounting seat 510. The multiple radial displacement sensors 530 are evenly arranged on the inner circumferential surface of the mounting seat 510. For example, when two groups of radial displacement sensors 530 are provided, two adjacent radial displacement sensors 530 are spaced 90° apart. When three groups of radial displacement sensors 530 are provided, two adjacent radial displacement sensors 530 are spaced 60° apart.

[0059] By integrating the radial displacement sensor 530 and the axial displacement sensor 520 on one mounting base, not only is installation and maintenance facilitated, but the internal space occupied by the magnetic suspension energy storage flywheel is further reduced.

[0060] The magnetic levitation energy storage flywheel provided in this embodiment greatly reduces the occupation of the internal space of the magnetic levitation energy storage flywheel without affecting the operation effect by winding the torque winding 220 that can rotate the rotor 100 and the suspension winding 230 that can suspend the rotor 100 in its axial direction on a stator core 210; based on the pseudo-rigid body theory of the compliant mechanism, a recessed structure 310 is provided on the protective bearing 300 to improve its protection effect and ensure the safety of the magnetic levitation energy storage flywheel during operation; in addition, the displacement sensor is integrated, and the above-mentioned arrangement improves the space utilization rate of the magnetic levitation energy storage flywheel, making the magnetic levitation energy storage flywheel compact in structure and highly integrated in function, which is conducive to the miniaturization of the magnetic levitation energy storage flywheel, and also reduces the possibility of damage and saves maintenance costs.

[0061] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention is indicated by the claims.

[0065] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed by the present invention. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention is indicated by the following claims.

[0066] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A magnetically suspended energy storage flywheel, characterized in that: The magnetic suspension energy storage flywheel comprises: A rotor (100), the rotor (100) comprising a rotor shaft (110) and a rotor body (120), wherein in the axial direction, the rotor body (120) is located in the middle of the rotor shaft (110), and the rotor body (120) is a cylindrical structure; Two stators (200) are provided, wherein the stators (200) are in a circular disk-shaped structure. In the axial direction of the rotor (100), the two stators (200) are both sleeved on the rotor shaft (110) and are respectively located at two ends of the rotor body (120), and a gap is provided between the stators (200) and the rotor body (120); each of the stators (200) comprises a stator core (210), a torque winding (220) and a suspension winding (230), and the torque winding (220) and the suspension winding (230) are both wound on the stator core (210) in a circular disk shape.

2. The magnetic suspension energy storage flywheel according to claim 1, characterized in that: The stator core (210) is provided with a plurality of through holes (2110) extending in the radial direction of the stator core (210); the through holes (2110) are not penetrated in the axial direction of the stator core (210); the torque winding (220) and the suspension winding (230) are wound on the stator core (210) through the through holes (2110); wherein, in the axial direction of the stator core (210), the suspension winding (230) is arranged closer to the rotor body (120) than the torque winding (220).

3. The magnetic suspension energy storage flywheel according to claim 1, characterized in that: The rotor (100) further comprises a plurality of permanent magnets (130), the permanent magnets (130) being of a fan-shaped structure, the plurality of permanent magnets (130) being evenly embedded on two end faces of the rotor body (120) along a circumferential direction, and a surface of one side of the permanent magnet (130) close to the stator core (210) being flush with the end face of the rotor body (120).

4. The magnetic suspension energy storage flywheel according to claim 1, characterized in that: The magnetic suspension energy storage flywheel further comprises two protective bearings (300), both of which are fixedly connected to the housing (600), and both of which are sleeved on the rotor shaft (110) and respectively located at two ends of the rotor body (120) in the axial direction.

5. The magnetic suspension energy storage flywheel according to claim 4, characterized in that: The magnetic suspension energy storage flywheel further comprises two radial magnetic bearings (400), both of which are sleeved on the rotor shaft (110) and are respectively arranged at two ends of the rotor body (120) in the axial direction of the rotor shaft (110); in the radial direction of the rotor shaft (110), the distance between the inner circumferential surface of the radial magnetic bearing (400) and the rotor shaft (110) is greater than the distance between the inner circumferential surface of the protective bearing (300) and the rotor shaft (110).

6. The magnetic suspension energy storage flywheel according to claim 4, characterized in that: A plurality of recessed structures (310) are provided on the inner circumferential surface of the protective bearing (300) and / or on two annular surfaces perpendicular to the axial direction of the protective bearing (300).

7. The magnetic suspension energy storage flywheel according to claim 6, characterized in that: The cross-sectional area of ​​the recessed structure (310) is related to the material density of the rotor body (120), the radius of the rotor body (120), the height of the rotor body (120), the angular velocity of rotation of the rotor body (120), the elastic modulus of the protective bearing (300), and the deformation amount of the protective bearing (300).

8. The magnetic suspension energy storage flywheel according to claim 7, characterized in that: The number of the recessed structures (310) is less than or equal to the ratio of the contact area between the protective bearing (300) and the rotor (100) to the cross-sectional area of ​​the recessed structures (310).

9. The magnetic suspension energy storage flywheel according to any one of claims 1 to 8, characterized in that: The magnetic suspension energy storage flywheel further comprises two groups of displacement sensor assemblies (500), the two groups of displacement sensor assemblies (500) being respectively arranged at two ends of the rotor shaft (110) along its axial direction, the displacement sensor assemblies (500) being electrically connected to a controller, the controller being electrically connected to both the suspension winding (230) and the torque winding (220), the displacement sensor assemblies (500) being used to detect position changes of the rotor (100), and the controller being used to receive signals from the displacement sensor assemblies (500) and to control currents in the suspension winding (230) and the torque winding (220).

10. The magnetic suspension energy storage flywheel according to claim 9, characterized in that: Each set of the displacement sensor assembly (500) comprises a mounting seat (510), an axial displacement sensor (520), and at least two sets of radial displacement sensors (530). The mounting seat (510) is in a circular ring structure and is sleeved on the rotor shaft (110); the axial displacement sensor (520) and the radial displacement sensor (530) are both arranged on the inner circumferential surface of the mounting seat (510); Each group of the radial displacement sensors (530) comprises two radial displacement sensors (530) arranged opposite to each other on the mounting seat (510), and a plurality of the radial displacement sensors (530) are evenly arranged on the inner circumferential surface of the mounting seat (510).

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