A magnetic levitation energy storage flywheel

Abstract

This invention relates to the field of magnetic levitation technology, and more particularly to a magnetic levitation energy storage flywheel. The magnetic levitation energy storage flywheel includes a rotor and two stators. The rotor includes a rotor shaft and a rotor body. In its axial direction, the rotor body is located at the center of the rotor shaft and has a cylindrical structure. The stators have a circular disc-shaped structure. In the axial direction of the rotor, both stators are sleeved on the rotor shaft and located at opposite ends of the rotor body, with a gap between the stators and the rotor body. Each stator includes a stator core, a torque winding, and a levitation winding. Both the torque winding and the levitation winding are wound on the circular disc-shaped stator core. This design allows the torque winding, which enables the rotor to rotate, and the levitation winding, which enables the rotor to levitate in its axial direction, to share a single stator core, significantly reducing the space occupied inside the magnetic levitation energy storage flywheel. This results in a compact structure, highly integrated functions, and a trend towards miniaturization.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation technology, and in particular to a magnetic levitation energy storage flywheel. Background Technology

[0002] Flywheel energy storage technology refers to an energy storage method that uses an electric motor to drive a flywheel to rotate at high speed, converting electrical energy into kinetic energy for storage. When electricity is needed, the flywheel drives a generator to generate electricity, converting the kinetic energy into electrical energy for use. It has advantages such as 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 advantages over mechanical bearing energy storage flywheels, such as less mechanical wear, higher conversion efficiency, and lower noise. They have higher energy utilization efficiency and are therefore widely used in power generation.

[0004] However, the current magnetic levitation energy storage flywheel has an insufficiently compact internal structure, resulting in wasted internal space and hindering its miniaturization. Summary of the Invention

[0005] To overcome the problems existing in related technologies, this invention provides a magnetic levitation energy storage flywheel that improves space utilization without affecting performance.

[0006] According to some embodiments, a magnetically levitated energy storage flywheel is provided, comprising: The rotor includes a rotor shaft and a rotor body. In its axial direction, the rotor body is located in the middle of the rotor shaft and has a cylindrical structure. Two stators, each stator having a circular disc-shaped structure, are mounted on the rotor shaft in the axial direction of the rotor and are located at both ends of the rotor body, with a gap between the stator and the rotor body. Each stator includes a stator core, a torque winding, and a suspension winding, with the torque winding and the suspension winding wound on the circular disc-shaped stator core.

[0007] In some embodiments of the present invention, the stator core is provided with a plurality of through holes extending in the radial direction of the stator core. The through holes do not penetrate in the axial direction of the stator core. The torque winding and the suspension winding pass through the through holes and are wound on the stator core. In the axial direction of the stator core, the suspension winding is positioned closer to the rotor body than the torque winding.

[0008] In some embodiments of the present invention, the rotor further includes multiple permanent magnets, which are fan-shaped structures. The multiple permanent magnets are uniformly embedded on two end faces of the rotor body along the circumferential direction, and the surface of the permanent magnets near 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 further includes two protective bearings, both of which are fixedly connected to the housing and are sleeved on the rotor shaft and 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 further includes two radial magnetic bearings, both of which are sleeved on the rotor shaft and respectively disposed 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, the inner circumferential surface of the protective bearing and / or the two annular surfaces perpendicular to the axial direction of the protective bearing are provided with a plurality of recessed structures.

[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 the rotor body rotation, 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 recessed structures is less than or equal to the ratio of the area of ​​the protective bearing in contact with the rotor to the cross-sectional area of ​​the recessed structure.

[0014] In some embodiments of the present invention, the magnetic levitation energy storage flywheel further includes two sets of displacement sensing components. The two sets of displacement sensing components are respectively disposed at both ends of the rotor shaft along its axial direction. The displacement sensing components are electrically connected to the controller. The controller is electrically connected to both the levitation winding and the torque winding. The displacement sensing components are used to detect changes in the position of the rotor. The controller is used to receive signals from the displacement sensing components and control the current in the levitation winding and the torque winding.

[0015] In some embodiments of the present invention, each set of displacement sensing components includes a mounting base, an axial displacement sensor, and at least two sets of radial displacement sensors. The mounting base has a circular structure and is sleeved on the rotor shaft. The axial displacement sensor and the radial displacement sensor are both disposed on the inner circumferential surface of the mounting base. Each set of radial displacement sensors includes two radial displacement sensors disposed opposite each other on the mounting base, and a plurality of radial displacement sensors are evenly arranged on the inner circumferential surface of the mounting base.

[0016] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects: The present invention provides a magnetic levitation energy storage flywheel, which sets a stator at each end of the rotor along its axial direction. Each stator includes a stator core, a torque winding and a suspension winding. The torque winding that enables the rotor to rotate and the suspension winding that enables the rotor to levitate in its axial direction share a stator core, which greatly reduces the internal space occupied by the magnetic levitation energy storage flywheel, improves the space utilization rate, and makes the internal structure of the magnetic levitation energy storage flywheel compact and highly integrated, which is conducive to the miniaturization of magnetic levitation energy storage flywheels.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form 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 This is a cross-sectional view of a magnetically levitated energy storage flywheel according to an exemplary embodiment; Figure 2 yes Figure 1 Schematic diagram of the middle stator core; Figure 3 yes Figure 1 Schematic diagram of the layout of the medium torque winding; Figure 4 yes Figure 1 Schematic diagram of the layout of the intermediate suspension winding; Figure 5 yes Figure 1 Schematic diagram of the middle rotor; Figure 6 yes Figure 1 Schematic diagram of the structure of the central protective bearing; Figure 7 yes Figure 1 A schematic diagram of the structure of the displacement sensing component.

[0020] Figure label: 100. Rotor; 110. Rotor shaft; 120. Rotor body; 130. Permanent magnet; 200, Stator; 210, Stator core; 2110, Through hole; 220, Torque winding; 230, Floating winding; 300. Protects the bearing; 310. Recessed structure; 400. Radial magnetic bearing; 500 Displacement sensing assembly; 510 Mounting base; 520 Axial displacement sensor; 530 Radial displacement sensor; 600, housing; 610, first end cap; 620, second end cap; 630, first flywheel housing; 640, second flywheel housing; 650, third flywheel housing. Detailed Implementation

[0021] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0022] Flywheel energy storage technology is a method of energy storage and power generation. When the electric motor is running, the magnetic field generated by the torque winding interacts with the magnetic field generated by the permanent magnet to produce torque, driving the rotor to rotate at high speed and converting electrical energy into the rotor's kinetic energy for storage. When electricity is needed, the magnetic field of the permanent magnet cuts the torque winding during the rotor's rotation, generating an electromotive force and thus producing current, converting kinetic energy into electrical energy for use. Flywheel energy storage technology has advantages such as high power density, high charging and discharging efficiency, long service life, and no environmental pollution. 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 bearings during rotation, thus having advantages such as less mechanical wear, higher conversion efficiency, and lower noise compared to mechanical bearing energy storage flywheels. Its energy utilization efficiency is higher, and therefore it is widely used in the power generation field. However, the current internal structure of magnetic levitation energy storage flywheels is not compact enough, resulting in wasted internal space and hindering the miniaturization of magnetic levitation energy storage flywheels.

[0023] To address the aforementioned technical problems, this invention provides a magnetic levitation energy storage flywheel. By setting a stator at each end of the rotor along its axial direction, each stator includes a stator core, a torque winding, and a levitation winding. The torque winding, which enables the rotor to rotate, and the levitation winding, which enables the rotor to levitate axially, share a single stator core, significantly reducing the internal space required. Based on the pseudo-rigid body theory of compliant mechanisms, the protective bearing is designed to improve its protective effect. Furthermore, the displacement sensor is integrated into the design. These features improve the space utilization of the magnetic levitation energy storage flywheel, resulting in a compact internal structure and highly integrated functions, which is beneficial for the miniaturization of magnetic levitation energy storage flywheels.

[0024] The magnetic levitation energy storage flywheel provided according to the present invention will now be described in detail with reference to the accompanying drawings.

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

[0026] This invention provides a magnetically levitated energy storage flywheel, such as... Figure 1 and Figure 5 As shown, the magnetic levitation energy storage flywheel includes a housing 600, a rotor 100, and two stators 200. In the z-axis direction, the housing 600 includes a first flywheel chamber 630, a second flywheel chamber 640, and a third flywheel chamber 650, all of which are cylindrical and arranged sequentially along the axial direction. A first end cap 610 is disposed on the first flywheel chamber 630, and a second end cap 620 is disposed on the third flywheel chamber 650. The diameters of the first flywheel chamber 630 and the third flywheel chamber 650 are smaller than the diameter of the second flywheel chamber 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 and is disposed inside the second flywheel chamber 640. The rotor body 120 has a cylindrical structure.

[0027] Two stators 200 are also located in the second flywheel chamber 640. The stators 200 are disc-shaped annular structures. The two stators 200 are sleeved on the rotor shaft 110 and are located at both 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 stators 200 and the rotor body 120. When the rotor 100 is running 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. 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 enables the rotor 100 to rotate and the suspension winding 230 that enables the rotor 100 to levitate in its axial direction share a stator core 210, which greatly reduces the internal space occupied, improves the space utilization rate of the magnetic levitation energy storage flywheel, and makes the magnetic levitation energy storage flywheel compact in structure and highly integrated in function, developing towards miniaturization.

[0029] It should be noted that the magnetic field generated by the torque winding 220 is a rotating alternating magnetic field, while the magnetic field generated by the suspension winding 230 is an axial DC magnetic field. When both windings share a single stator core 210, as long as the stator core 210 does not experience local magnetic flux saturation, the two magnetic fields will not interfere with each other. Local magnetic flux saturation refers to the phenomenon where, under the influence of a magnetic field, the magnetic flux density in a localized area reaches its maximum value, leading to a significant decrease in the permeability of that area. Methods to avoid local magnetic flux saturation include: designing a magnetic circuit structure with uniform magnetic flux distribution; creating air gaps in the magnetic circuit structure to restrict magnetic flux flow; selecting core materials with high permeability and strong anti-saturation capabilities; reducing the load to avoid local magnetic flux saturation caused by excessive current and load; and improving operating conditions, such as by implementing heat dissipation structures to lower the operating temperature.

[0030] In some embodiments, such as Figure 2 As shown, the stator core 210 has an annular structure and multiple through holes 2110 are provided along the radial direction of the stator core 210. The through holes 2110 do not penetrate 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 located closer to the rotor body 120 than the torque winding 220. In another embodiment, in the z-axis direction, the torque winding 220 is located closer to the rotor body 120 than the suspension winding 230. Both are within the protection scope of this invention.

[0031] By setting a circular stator core 210 and winding the torque winding 220 and the suspension winding 230 in two layers on the stator core 210, the space occupied by the magnetic levitation energy storage flywheel is further reduced.

[0032] In one embodiment, Figure 3 The diagram shows the layout of the torque winding 220. Figure 4 The diagram shows the layout of the suspension winding 230. It should be noted that... Figure 3 and Figure 4 This only indicates the connection relationship between the torque winding 220 and the suspension winding 230. They are labeled as inner and outer rings to distinguish the two types of windings. In actual winding arrangement, they are not wound in inner and outer rings, but are wound in two layers along the axial direction of the stator core 210.

[0033] In one embodiment, such as Figure 5As shown, the rotor 100 also includes multiple permanent magnets 130, which are disposed on the two end faces of the rotor body 120. The permanent magnets 130 have a fan-shaped structure, and the radial length from the inner circumferential surface to the outer circumferential surface of the permanent magnets 130 is less than the radius of the rotor body 120. The multiple permanent magnets 130 are uniformly embedded on the two end faces of the rotor body 120 along the circumferential direction. The surface of the permanent magnets 130 near the stator core 210 is flush with the end face of the rotor body 120.

[0034] By arranging multiple permanent magnets 130 at intervals on the rotor body 120, compared to a single circular permanent magnet, the bending stress on the permanent magnets 130 during high-speed rotation of the rotor 100 can be reduced, thus preventing the permanent magnets 130 from breaking. By embedding the permanent magnets 130 inside the rotor body 120, the permanent magnets 130 are prevented from detaching from the rotor body 120 under centrifugal force, thus improving the safety and structural strength of the magnetic levitation energy storage flywheel during operation.

[0035] In some embodiments, such as Figure 1 and Figure 5 As shown, the rotor body 120 is formed by stacking silicon steel sheets, the stator core 210 is made of soft magnetic composite material, 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 levitation energy storage flywheel also includes two protective bearings 300. Both protective bearings 300 are fixedly connected to the housing 600 and are respectively disposed in the first flywheel chamber 630 and the third flywheel chamber 650. Both protective bearings 300 are sleeved on the rotor shaft 110 and are located at both ends of the rotor body 120 in the axial direction. 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 possess good high-temperature resistance and corrosion resistance.

[0037] By setting protective bearings 300 at both ends of the rotor shaft 110, when the rotor 100 becomes unstable, the rotor shaft 110 first contacts the protective bearings 300, and the protective bearings 300 absorb the impact energy of the rotor 100, thus protecting the other structures inside the magnetic levitation energy storage flywheel.

[0038] In one embodiment, such as Figure 1As shown, the magnetic levitation energy storage flywheel also includes two radial magnetic bearings 400. The two radial magnetic bearings 400 are fixedly connected to the housing 600 and are respectively disposed in the first flywheel chamber 630 and the third flywheel chamber 650. The two radial magnetic bearings 400 are both sleeved on the rotor shaft 110 and are respectively disposed 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 this design, the radial magnetic bearing 400 is used to ensure the rotor's radial levitation. Furthermore, by setting the distance between the inner circumferential surface of the radial magnetic bearing 400 and the rotor shaft 110 to be greater than the distance between the inner circumferential surface of the protective bearing 300 and the rotor shaft 110, it is ensured that when the rotor 100 becomes unstable, it will first contact the protective bearing 300 and will not cause damage to the radial magnetic bearing 400.

[0040] In one exemplary embodiment, such as Figure 6 As shown, the inner circumferential surface or the two annular surfaces of the protective bearing 300 are provided with multiple recessed structures 310, or multiple recessed structures 310 are provided on both the inner circumferential surface and the two annular surfaces. The two annular surfaces of the protective bearing 300 refer to the two surfaces that are perpendicular to the axial direction of the protective bearing 300.

[0041] In this embodiment, by setting the recessed structure 310, the bearing 300 is protected from greater elastic deformation when it is impacted, and more impact energy is absorbed. This enables the storage and transfer of impact energy when a large inertia rotor becomes unstable, thus 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 that opens towards the z-axis is the area of ​​the surface of the recessed structure 310 in the x-axis and y-axis planes, which is flush with the annular surface of the protective bearing 300 perpendicular to the z-axis direction; for example... Figure 6 The cross-sectional area of ​​the recessed structure 310 that opens in the axial direction of the protective bearing 300 is the area of ​​the surface of the recessed structure 310 that is 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, and there is no limitation here.

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

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

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

[0046] Protects bearings with 300 mm deformation and can absorb energy (W). s The calculation method is as follows:

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

[0048] When the energy possessed by 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 considered to be of acceptable design. At this point, the elastic modulus k of the protective bearing 300 is:

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

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

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

[0052] In some embodiments, the recessed structure 310 has a circular cross-section. The circular cross-section of the recessed structure 310 ensures isotropy, uniformly dispersing the impact load of the rotor 100 when the protective bearing 300 receives the impact of the rotor 100, avoiding excessive local load concentration on the protective bearing 300, and further improving the protective effect of the protective bearing 300.

[0053] In one embodiment, such as Figure 1 and Figure 7As shown, the magnetic levitation energy storage flywheel also includes two sets of displacement sensing components 500. Both sets of displacement sensing components 500 are fixedly connected to the housing 600 and are respectively disposed in the first flywheel chamber 630 and the third flywheel chamber 650. The two sets of displacement sensing components 500 are respectively disposed at both ends of the rotor shaft 110 along its axial direction. The displacement sensing 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). The displacement sensing components 500 are used to detect the position changes of the rotor 100 in the radial and axial directions and send the signals to the controller. The controller adjusts the operating state of the magnetic levitation energy storage flywheel according to the signals.

[0054] Specifically, the displacement sensing component 500 in this embodiment achieves stable levitation of the rotor 100 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 changes. After the displacement sensing component 500 detects this movement, it sends a signal to the controller. The controller adjusts the magnitude and direction of the current in the suspension winding 230 and the torque winding 220 according to the signal from the displacement sensor. This adjusts the force exerted on the rotor 100 by the combined magnetic field of the suspension winding 230 and the magnetic field of the permanent magnet 130, as well as the magnetic field of the torque winding 220, thereby achieving stable suspension of the rotor 100 in the z-axis direction.

[0055] When the rotor 100 becomes unstable and moves along the axial direction, the air gap between the rotor body 120 and the two radial magnetic bearings 400 will change. After the displacement sensing component 500 detects this movement, it sends a signal to the controller. The controller will adjust the magnitude and direction of the current in the radial magnetic bearings 400 and the torque winding 220 according to the signal from the displacement sensor, thereby adjusting the force exerted by the radial magnetic bearings 400 and the torque winding 220 on the rotor 100, thus achieving stable levitation of the rotor 100 in the axial direction.

[0056] In this embodiment, a displacement sensing component 500 is set to detect the displacement of the rotor 100 in the axial and radial directions. When the displacement is detected, a signal is sent to the controller to adjust the magnitude or direction of the winding current, thereby adjusting the magnetic field and realizing timely adjustment of the rotor 100 position.

[0057] In some embodiments, such as Figure 7As shown, each displacement sensing assembly 500 includes a mounting base 510, an axial displacement sensor 520, and at least two sets of radial displacement sensors 530. The mounting base 510 has multiple hollow structures to reduce its weight. In this embodiment, the radial displacement sensors 530 are arranged along the x-axis and y-axis directions, with a total of two sets. To more accurately detect the movement of the rotor 100 in the radial direction, the radial displacement sensors 530 can also be set to three or four sets, all of which are within the protection scope of this application and will not be elaborated here.

[0058] The mounting base 510 has a circular structure and is sleeved on the rotor shaft 110. The axial displacement sensor 520 and the radial displacement sensor 530 are both set on the inner circumferential surface of the mounting base 510. Each set of radial displacement sensors 530 includes two radial displacement sensors 530 arranged opposite each other on the mounting base 510. Multiple radial displacement sensors 530 are evenly arranged on the inner circumferential surface of the mounting base 510. For example, when there are two sets of radial displacement sensors 530, the two adjacent radial displacement sensors 530 are spaced 90° apart. When there are three sets of radial displacement sensors 530, the two adjacent radial displacement sensors 530 are spaced 60° apart.

[0059] By integrating the radial displacement sensor 530 and the axial displacement sensor 520 onto a single mounting base, installation and maintenance are not only facilitated, but the space occupied by the magnetic levitation energy storage flywheel is further reduced.

[0060] The magnetic levitation energy storage flywheel provided in this embodiment significantly reduces the space occupied by the internal space of the magnetic levitation energy storage flywheel without affecting the operation performance by winding the torque winding 220 that enables the rotor 100 to rotate and the suspension winding 230 that enables the rotor 100 to levitate in its axial direction on a stator core 210. Based on the pseudo-rigid body theory of compliant mechanism, a recessed structure 310 is set on the protective bearing 300 to improve its protective effect and ensure the safety of the magnetic levitation energy storage flywheel during operation. In addition, the displacement sensor is integrated. The above settings improve the space utilization of the magnetic levitation energy storage flywheel, making 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, 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 construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0062] 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 or an electrical connection; 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.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present 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.

[0064] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0065] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0066] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A magnetically levitated energy storage flywheel, characterized in that, The magnetically levitated energy storage flywheel includes: The rotor (100) includes a rotor shaft (110) and a rotor body (120). In its 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 arranged in a circular disc shape. In the axial direction of the rotor (100), the two stators (200) are sleeved on the rotor shaft (110) and located at both ends of the rotor body (120), and there is a gap between the stator (200) and the rotor body (120). Each stator (200) includes a stator core (210), a torque winding (220) and a suspension winding (230). The torque winding (220) and the suspension winding (230) are wound on the circular disc-shaped stator core (210). In the axial direction of the stator core (210), the suspension winding (230) is disposed closer to the rotor body (120) than the torque winding (220), and the torque winding (220) is disposed closer to the housing (600) than the suspension winding (230). The rotor (100) also includes multiple permanent magnets (130), which are fan-shaped structures. The multiple permanent magnets (130) are uniformly embedded on the two end faces of the rotor body (120) along the circumferential direction. The side surface of the permanent magnet (130) near the stator core (210) is flush with the end face of the rotor body (120). The permanent magnet (130) is used to cooperate with the suspension winding (230) to generate a suspension magnetic field, and the permanent magnet (130) is used to cooperate with the torque winding (220) to generate torque.

2. The magnetically levitated energy storage flywheel according to claim 1, characterized in that, The stator core (210) has a plurality of through holes (2110) extending in the radial direction of the stator core (210). The through holes (2110) do not penetrate the stator core (210) in the axial direction. The torque winding (220) and the suspension winding (230) pass through the through holes (2110) and are wound on the stator core (210).

3. The magnetically levitated energy storage flywheel according to claim 1, characterized in that, The magnetic levitation energy storage flywheel also includes two protective bearings (300), both of which are fixedly connected to the housing (600). Both of the protective bearings (300) are sleeved on the rotor shaft (110) and are located at both ends of the rotor body (120) in the axial direction.

4. The magnetically levitated energy storage flywheel according to claim 3, characterized in that, The magnetic levitation energy storage flywheel also includes two radial magnetic bearings (400). The two radial magnetic bearings (400) are both sleeved on the rotor shaft (110) and are respectively disposed 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).

5. The magnetically levitated energy storage flywheel according to claim 3, characterized in that, The inner circumferential surface of the protective bearing (300) and / or the two annular surfaces perpendicular to the axial direction of the protective bearing (300) are provided with a plurality of recessed structures (310).

6. The magnetically levitated energy storage flywheel according to claim 5, 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 the rotor body (120) rotation, the elastic modulus of the protective bearing (300), and the deformation of the protective bearing (300).

7. The magnetically levitated energy storage flywheel according to claim 6, characterized in that, The number of recessed structures (310) is less than or equal to the ratio of the area of ​​the protective bearing (300) in contact with the rotor (100) to the cross-sectional area of ​​the recessed structure (310).

8. The magnetically levitated energy storage flywheel according to any one of claims 1-7, characterized in that, The magnetic levitation energy storage flywheel also includes two sets of displacement sensing components (500). The two sets of displacement sensing components (500) are respectively disposed at both ends of the rotor shaft (110) along its axial direction. The displacement sensing components (500) are electrically connected to the controller. The controller is electrically connected to the suspension winding (230) and the torque winding (220). The displacement sensing components (500) are used to detect the position change of the rotor (100). The controller is used to receive the signal from the displacement sensing components (500) and control the current in the suspension winding (230) and the torque winding (220).

9. The magnetically levitated energy storage flywheel according to claim 8, characterized in that, Each of the displacement sensing components (500) includes a mounting base (510), an axial displacement sensor (520), and at least two sets of radial displacement sensors (530). The mounting base (510) has a circular structure and is sleeved on the rotor shaft (110). The axial displacement sensor (520) and the radial displacement sensor (530) are both disposed on the inner circumferential surface of the mounting base (510). Each set of radial displacement sensors (530) includes two radial displacement sensors (530) disposed opposite each other on the mounting base (510), and a plurality of radial displacement sensors (530) are evenly arranged on the inner circumferential surface of the mounting base (510).

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