Flywheel energy storage device

Abstract

The application relates to a flywheel energy storage device, a mounting shell has a first accommodating cavity, a mounting channel and a second accommodating cavity which are sequentially communicated along a first direction of the mounting shell; a magnetic bearing assembly is arranged in the mounting channel; a rotor comprises a rotating part, a first weight part and a second weight part, the rotating part is located in the mounting channel and rotationally matches with the magnetic bearing assembly, the first weight part is arranged at one end of the rotating part along the first direction, the second weight part is arranged at the other end of the rotating part along the first direction, the first weight part is located in the first accommodating cavity, and the second weight part is located in the second accommodating cavity; a stator module is arranged on a side cavity wall of the first accommodating cavity away from the mounting channel; and a first permanent magnet is arranged on a side of the first weight part away from the rotating part. During rotation of the rotor, the center of mass of the rotor can be closer to a supporting point of the rotor by the magnetic bearing assembly, so that the runout and vibration of the rotor during high-speed rotation are reduced, and the energy conversion efficiency of the flywheel energy storage device during charging and discharging is improved.

Description

Technical Field

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

[0002] In flywheel energy storage devices, the use of mechanical bearings to support the flywheel rotor generates frictional losses, leading to a decrease in the energy conversion efficiency of the flywheel energy storage device. To eliminate frictional losses, traditional technologies typically replace the mechanical bearings in flywheel energy storage devices with magnetic bearings. This eliminates the mechanical frictional losses of the bearings, reduces the standby losses of the flywheel energy storage device, and thus improves the energy conversion efficiency of the flywheel energy storage device.

[0003] Stable and high-speed rotation of the flywheel rotor is the core prerequisite for ensuring energy storage efficiency and device reliability. In traditional flywheel energy storage devices, the internal flywheel rotor is prone to wobbling or vibration during operation, which affects energy conversion efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a flywheel energy storage device to address the problem that the flywheel rotor is prone to wobbling or vibration, which leads to a decrease in energy conversion efficiency in traditional technologies.

[0005] The technical solution is as follows:

[0006] One embodiment provides a flywheel energy storage device, comprising:

[0007] The mounting housing has a first receiving cavity, a mounting channel, and a second receiving cavity that are sequentially connected along its first direction;

[0008] A magnetic bearing assembly disposed in the mounting channel;

[0009] The rotor includes a rotating part, a first weight part, and a second weight part. The rotating part is located in the mounting channel and rotates in cooperation with the magnetic bearing assembly. The first weight part is located at one end of the rotating part along the first direction, and the second weight part is located at the other end of the rotating part along the first direction. The first weight part is located in the first accommodating cavity, and the second weight part is located in the second accommodating cavity.

[0010] Stator module, the stator module being disposed on the side wall of the first accommodating cavity away from the mounting channel; and

[0011] A first permanent magnet is disposed on the side of the first weight portion away from the rotating portion.

[0012] In the aforementioned flywheel energy storage device, the first and second accommodating cavities are respectively located at opposite ends of the mounting channel along the first direction. The stator module is located on the side wall of the first accommodating cavity away from the mounting channel, and the first permanent magnet is located on the side of the first weight portion away from the rotating portion, so that the first permanent magnet can generate a magnetic effect with the stator module. The rotor can rotate under the action of the magnetic bearing assembly, thereby realizing the charging and discharging of the flywheel energy storage device. During the rotation of the rotor, since the first and second weight portions are respectively located at opposite ends of the rotating portion along the first direction, the center of mass of the rotor can be closer to the support point of the magnetic bearing assembly, thereby reducing the yaw and vibration of the rotor during high-speed rotation, and thus improving the energy conversion efficiency of the flywheel energy storage device during charging and discharging.

[0013] In one embodiment, the first weight portion, the second weight portion, and the rotating portion are all columnar, and the diameters of the first weight portion and the second weight portion are both larger than the diameter of the rotating portion.

[0014] In one embodiment, the mounting housing includes a housing and a partition. The housing has a receiving space, and the partition is disposed within the receiving space to divide the receiving space into a first receiving cavity and a second receiving cavity. The mounting channel is formed in the partition so that the first receiving cavity communicates with the second receiving cavity through the mounting channel.

[0015] In one embodiment, the magnetic bearing assembly includes a first bearing module and a second bearing module, the first bearing module and the second bearing module being spaced apart along the first direction on the sidewall of the mounting channel, and the rotating part passing through the first bearing module and the second bearing module.

[0016] In one embodiment, the first bearing module includes a first magnetic ring and a first magnetic bearing winding. The outer ring surface of the first magnetic ring is disposed on the side wall of the mounting channel, and the first magnetic bearing winding is disposed on the inner wall of the first magnetic ring. The second bearing module includes a second magnetic ring and a second magnetic bearing winding. The outer ring surface of the second magnetic ring is disposed on the side wall of the mounting channel, and the second magnetic bearing winding is disposed on the inner wall of the second magnetic ring. The magnetic bearing assembly further includes a second permanent magnet disposed between the first magnetic ring and the second magnetic ring.

[0017] In one embodiment, the flywheel energy storage device further includes a third permanent magnet and a fourth permanent magnet. The third permanent magnet is disposed on the side wall of the second accommodating cavity away from the mounting channel, and the fourth permanent magnet is disposed on the side of the second weight part away from the rotating part. The magnetic poles of the side of the third permanent magnet facing the fourth permanent magnet are opposite to the magnetic poles of the side of the fourth permanent magnet facing the third permanent magnet.

[0018] In one embodiment, the flywheel energy storage device further includes a first magnetic shielding element, which is disposed on the side of the second weight portion away from the rotating portion, and the fourth permanent magnet is ring-shaped and sleeved on the outside of the first magnetic shielding element.

[0019] In one embodiment, the second accommodating cavity has a boss on the side wall away from the mounting channel, and the third permanent magnet is annular and sleeved on the boss.

[0020] In one embodiment, the stator module includes a stator support and a stator armature winding, the stator support being disposed on a side wall of the first accommodating cavity away from the mounting channel, and the stator armature winding being disposed on the stator support.

[0021] In one embodiment, the flywheel energy storage device further includes a second magnetic shielding component, which is disposed on the side of the first weight portion away from the rotating portion, and the first permanent magnet is annular and sleeved on the second magnetic shielding component. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the external structure of a flywheel energy storage device in one embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the internal structure of a flywheel energy storage device in one embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the paths of the bias flux and the control flux in one embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the mounting shell structure in one embodiment of this application.

[0027] Figure 5 This is a schematic diagram of the structure of a magnetic bearing assembly in one embodiment of this application.

[0028] Figure 6 This is a schematic diagram of the rotor structure in one embodiment of this application.

[0029] Figure 7 This is a schematic diagram of the stator module in one embodiment of this application.

[0030] Attached image annotations:

[0031] 100. Mounting housing; 110. First accommodating cavity; 120. Second accommodating cavity; 130. Mounting channel; 140. Housing; 141. First end plate; 142. Second end plate; 143. Boss; 150. Separator; 151. Annular groove; 200. Magnetic bearing assembly; 210. First bearing module; 211. First magnetic ring; 212. First magnetic bearing winding; 220. Second bearing module; 221. 1. Second magnetic ring; 222. Second magnetic bearing winding; 230. Second permanent magnet; 300. Rotor; 310. First weight part; 320. Second weight part; 330. Rotating part; 400. Stator module; 410. Stator bracket; 420. Stator armature winding; 500. First permanent magnet; 610. Third permanent magnet; 620. Fourth permanent magnet; 710. First magnetic shielding component; 720. Second magnetic shielding component. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] Please see Figures 1 to 2One embodiment of this application provides a flywheel energy storage device, including a mounting housing 100, a magnetic bearing assembly 200, a rotor 300, a stator module 400, and a first permanent magnet 500. The mounting housing 100 has a first accommodating cavity 110, a mounting channel 130, and a second accommodating cavity 120 that are sequentially connected along a first direction. The magnetic bearing assembly 200 is disposed in the mounting channel 130. The rotor 300 includes a rotating part 330, a first weight part 310, and a second weight part 320. The rotating part 330 is located in the mounting housing 100. The first weight part 310 is disposed at one end of the rotating part 330 along the first direction, and the second weight part 320 is disposed at the other end of the rotating part 330 along the first direction. The first weight part 310 is located in the first accommodating cavity 110, and the second weight part 320 is located in the second accommodating cavity 120. The stator module 400 is disposed on the side wall of the first accommodating cavity 110 away from the mounting channel 130. The first permanent magnet 500 is disposed on the side of the first weight part 310 away from the rotating part 330.

[0039] In the aforementioned flywheel energy storage device, the first accommodating cavity 110 and the second accommodating cavity 120 are respectively located at opposite ends of the mounting channel 130 along the first direction. The stator module 400 is located on the side wall of the first accommodating cavity 110 away from the mounting channel 130. The first permanent magnet 500 is located on the side of the first weight part 310 away from the rotating part 330, so that the first permanent magnet 500 can generate a magnetic effect with the stator module 400. The rotor 300 can rotate under the action of the magnetic bearing assembly 200, thereby realizing the charging and discharging of the flywheel energy storage device. During the rotation of the rotor 300, since the first weight part 310 and the second weight part 320 are respectively located at opposite ends of the rotating part 330 along the first direction, the center of mass of the rotor 300 can be closer to the support point of the magnetic bearing assembly 200 on the rotor 300, thereby reducing the yaw and vibration of the rotor 300 during high-speed rotation, and thus improving the energy conversion efficiency of the flywheel energy storage device during charging and discharging.

[0040] As an explanation, in conventional technology, magnetic bearings are usually located at the ends of rotor 300. From the perspective of mechanical balance and leverage effect, their effect is not ideal. Because the rotational radii of the various particles on rotor 300 are different, an "unbalanced centrifugal force" is generated during rotation. The higher the rotational speed of rotor 300, the greater this force, continuously pushing rotor 300 away from the center of rotation, causing rotor 300 to wobble or vibrate. In this embodiment, the magnetic bearing assembly 200 is positioned between the first weight portion 310 and the second weight portion 320. Under the action of the first weight portion 310 and the second weight portion 320, the center of mass of rotor 300 is closer to or coincides with the magnetic bearing assembly 200, making the mass of rotor 300 symmetrically distributed with respect to the location of the magnetic bearing assembly 200. Ideally, the centrifugal forces of each particle on rotor 300 are equal in magnitude and opposite in direction, thus canceling each other out, resulting in a net force of zero. Without continuous external force pushing, rotor 300 achieves stable rotation.

[0041] In some embodiments, the mass of the first weight portion 310 and the mass of the second weight portion 320 are equal, and the magnetic bearing assembly 200 is disposed at the center of the rotor 300 so that the rotor 300 can achieve stable rotation.

[0042] As further explained, the first permanent magnet 500 located on the first weight part 310 can rotate synchronously with the rotor 300. The first permanent magnet 500 is used to generate an air gap magnetic field so that the first permanent magnet 500 and the stator module 400 constitute a motor component, through which the charging and discharging of the flywheel energy storage device is realized.

[0043] In some embodiments, the mounting housing 100 is a sealed housing. Sealing the mounting housing 100 can provide a vacuum environment for the rotor 300 located inside the mounting housing 100, thereby reducing the air resistance of the rotor 300 during rotation and reducing energy loss.

[0044] Understandably, the first direction in the above embodiment is the height direction of the mounting housing 100, that is... Figure 2 The direction A in the diagram will not be elaborated upon here.

[0045] Please see Figure 2 and Figure 6 In one embodiment, the first weight portion 310, the second weight portion 320, and the rotating portion 330 are all columnar, and the diameter of the first weight portion 310 and the diameter of the second weight portion 320 are both larger than the diameter of the rotating portion 330.

[0046] Setting the rotating part 330 as a column with a relatively small diameter ensures the smoothness of its rotational engagement with the magnetic bearing assembly 200. Setting the first weight part 310 and the second weight part 320 as columns with relatively large diameters not only improves the rotational stability of the rotor 300, but also maximizes the overall mass of the rotor 300, allowing it to store more kinetic energy. A larger mass rotor 300 can also reduce the impact of external disturbances on the rotation of the rotor 300.

[0047] Furthermore, the first weight portion 310 and the second weight portion 320 have the same shape and mass.

[0048] exist Figure 2 and Figure 6 In the embodiment shown, the rotor 300 is a dumbbell-shaped rotor 300 that is thick at both ends and thin in the middle. The rotor 300 is in the shape of an "I" and is made of high-strength structural steel. The middle position of the rotating part 330 is rotated and engaged with the magnetic bearing assembly 200.

[0049] Please see Figure 2 In one embodiment, the mounting housing 100 includes a housing 140 and a partition 150. The housing 140 has a receiving space, and the partition 150 is disposed within the receiving space to divide the receiving space into a first receiving cavity 110 and a second receiving cavity 120. A mounting channel 130 is formed in the partition 150 so that the first receiving cavity 110 communicates with the second receiving cavity 120 through the mounting channel 130.

[0050] The separator 150 has an installation channel 130 and divides the accommodating space into a first accommodating cavity 110 and a second accommodating cavity 120, thereby making the shape of the accommodating space in the housing 140 a dumbbell-shaped space that matches the rotor 300. The larger first accommodating cavity 110 and the second accommodating cavity 120 are used to accommodate the first weight part 310 and the second weight part 320, respectively, while the relatively smaller installation channel 130 is used to accommodate the rotating part 330 and the magnetic bearing assembly 200, so that the space distribution in the housing 140 is more reasonable and the compactness of the flywheel energy storage device can be improved.

[0051] Further, please refer to Figure 1 and Figure 2 The housing 140 includes an outer sleeve, a first end plate 141 and a second end plate 142. The first end plate 141 and the second end plate 142 are respectively disposed at opposite ends of the outer sleeve to form an accommodating space. A separator 150 is disposed on the inner wall of the outer sleeve to divide the accommodating space to form a first accommodating cavity 110 and a second accommodating cavity 120.

[0052] In one embodiment, the outer sleeve, the first end plate 141, and the second end plate 142 are all made of stainless steel.

[0053] In one embodiment, the separator 150 is integrally formed with the outer sleeve.

[0054] Furthermore, the inner wall of the mounting channel 130 of the separator 150 is provided with an annular groove 151, and the magnetic bearing assembly 200 is disposed in the annular groove 151 for mounting and positioning the magnetic bearing assembly 200.

[0055] Please see Figure 2 , Figure 3 and Figure 5 In one embodiment, the magnetic bearing assembly 200 includes a first bearing module 210 and a second bearing module 220, which are spaced apart along a first direction on the sidewall of the mounting channel 130, and the rotating part 330 passes through the first bearing module 210 and the second bearing module 220.

[0056] The first bearing module 210 and the second bearing module 220, which are spaced apart along the first direction on the side wall of the mounting channel 130, can provide more stable support for the rotating part 330 and prevent the rotating part 330 from tilting in the mounting channel 130, which would cause the rotor 300 to wobble or vibrate.

[0057] For explanation, the rotating part 330 is cylindrical, and the first bearing module 210 and the second bearing module 220 are spaced apart along the axial direction of the cylindrical rotating part 330 in the mounting channel 130 to support and limit the cylindrical rotating part 330 at different positions along its own axial direction, so as to prevent the rotating part 330 from tilting within the mounting channel 130.

[0058] Please see Figure 2 , Figure 3 and Figure 5 In one embodiment, the first bearing module 210 includes a first magnetic ring 211 and a first magnetic bearing winding 212. The outer ring surface of the first magnetic ring 211 is disposed on the side wall of the mounting channel 130, and the first magnetic bearing winding 212 is disposed on the inner wall of the first magnetic ring 211. The second bearing module 220 includes a second magnetic ring 221 and a second magnetic bearing winding 222. The outer ring surface of the second magnetic ring 221 is disposed on the side wall of the mounting channel 130, and the second magnetic bearing winding 222 is disposed on the inner wall of the second magnetic ring 221. The magnetic bearing assembly 200 also includes a second permanent magnet 230, which is disposed between the first magnetic ring 211 and the second magnetic ring 221.

[0059] The bias magnetic flux path generated by the second permanent magnet 230 is: second permanent magnet 230 → first magnetic ring 211 → rotating part 330 → second magnetic ring 221 → second permanent magnet 230. The first magnetic bearing winding 212 can generate a control magnetic flux. The combined magnetic flux through the teeth of the first magnetic ring 211 is the superposition of the bias magnetic flux and the control magnetic flux. By controlling the current of the first magnetic bearing winding 212, the control magnetic flux is adjusted, thereby changing the combined magnetic flux and thus adjusting the electromagnetic force of the first bearing module 210. Similarly, by controlling the current of the second magnetic bearing winding 222, the control magnetic flux is adjusted, thereby changing the combined magnetic flux and thus adjusting the electromagnetic force of the second bearing module 220 to achieve magnetic levitation of the rotor 300.

[0060] Understandably, controlling the magnetic flux and biasing the magnetic flux, such as Figure 3 As shown, the dashed line represents the control flux path, and the solid line represents the bias flux path.

[0061] Furthermore, the first magnetic bearing winding 212 is placed in the tooth portion of the first magnetic ring 211, and the second magnetic bearing winding 222 is placed in the tooth portion of the second magnetic ring 221.

[0062] For explanation, please refer to Figure 3 By controlling the current of the first magnetic bearing winding 212, the control flux is adjusted, thereby affecting the combined magnetic flux of the teeth of the first magnetic ring 211 in the x and y directions. This achieves control over the translational motion of one part of the rotating part 330 in the x and y directions. At this time, the rotating part 330 may tilt. By controlling the current of the second magnetic bearing winding 222, the control flux of the second bearing module 220 is adjusted, thereby affecting the combined magnetic flux of the teeth of the second magnetic ring 221 in the x and y directions. This achieves control over the translational motion of another part of the rotating part 330 in the x and y directions. By controlling the translational motion of two parts of the rotating part 330, the tilting of the rotating part 330 within the mounting channel 130 is prevented, thereby effectively avoiding swaying or vibration of the rotor 300.

[0063] For further explanation, please refer to Figure 3 In the above embodiment, the x-direction and y-direction are two directions perpendicular to the first direction, and the x-direction is perpendicular to the y-direction. For further understanding, the x-direction and y-direction can be understood as two coordinate axes of a planar coordinate system, the plane of which is parallel to the ground.

[0064] Please see Figure 2In one embodiment, the flywheel energy storage device further includes a third permanent magnet 610 and a fourth permanent magnet 620. The third permanent magnet 610 is disposed on the side wall of the second accommodating cavity 120 away from the mounting channel 130, and the fourth permanent magnet 620 is disposed on the side of the second weight part 320 away from the rotating part 330. The magnetic poles of the side of the third permanent magnet 610 facing the fourth permanent magnet 620 are opposite to the magnetic poles of the side of the fourth permanent magnet 620 facing the third permanent magnet 610.

[0065] The third permanent magnet 610 and the fourth permanent magnet 620 are arranged opposite to each other, and the magnetic poles of the side of the third permanent magnet 610 facing the fourth permanent magnet 620 are opposite to the magnetic poles of the side of the fourth permanent magnet 620 facing the fourth permanent magnet 620, so as to generate an upward repulsive force on the rotor 300, provide axial force for the rotor 300 and counteract the gravitational load, thereby realizing the levitation of the flywheel rotor 300.

[0066] Furthermore, the third permanent magnet 610 is disposed on the second end plate 142, the straight line where the rotor 300's axis of rotation is located is perpendicular to the ground, and the fourth permanent magnet 620 is disposed on the side of the second weight part 320 facing the ground, so as to be disposed opposite to the third permanent magnet 610. The repulsive force generated between the fourth permanent magnet 620 and the third permanent magnet 610 can counteract the gravity of the rotor 300, thereby realizing the levitation of the rotor 300.

[0067] Please see Figure 2 In one embodiment, the flywheel energy storage device further includes a first magnetic shielding element 710, which is disposed on the side of the second weight part 320 away from the rotating part 330, and a fourth permanent magnet 620 is annular and sleeved on the outside of the first magnetic shielding element 710.

[0068] The first magnetic shielding member 710, located on the side of the second weight part 320 away from the rotating part 330, can not only reduce the demagnetization of the third permanent magnet 610, but also provide a positioning effect for the fourth permanent magnet 620.

[0069] Furthermore, the first magnetic shielding element 710 is in the shape of a disc. The disc-shaped first magnetic shielding element 710 is used to accommodate the annular fourth permanent magnet 620 to prevent the fourth permanent magnet 620 from moving and affecting the alignment accuracy with the third permanent magnet 610, thus avoiding affecting the levitation effect of the rotor 300.

[0070] Please see Figure 2 In one embodiment, the second accommodating cavity 120 has a boss 143 on the side wall away from the mounting channel 130, and the third permanent magnet 610 is annular and sleeved on the boss 143.

[0071] The boss 143 prevents the third permanent magnet 610 from moving and affecting the alignment accuracy between the third permanent magnet 610 and the fourth permanent magnet 620, thereby improving the suspension stability of the rotor 300.

[0072] Furthermore, the boss 143 is provided on the second end plate 142, and the position of the boss 143 is opposite to the position of the first magnetic shield 710, so that the positions of the third permanent magnet 610 and the fourth permanent magnet 620 are opposite, thereby enabling the rotor 300 to be stably suspended.

[0073] Furthermore, the magnetization direction of the third permanent magnet 610 and the fourth permanent magnet 620 is axial.

[0074] In one embodiment, the faces of the third permanent magnet 610 and the fourth permanent magnet 620 with opposite polarities are aligned with each other, and the third permanent magnet 610 and the fourth permanent magnet 620 are the same size and shape.

[0075] Please see Figure 2 and Figure 7 In one embodiment, the stator module 400 includes a stator support 410 and a stator armature winding 420. The stator support 410 is disposed on a side wall of the first accommodating cavity 110 away from the mounting channel 130, and the stator armature winding 420 is disposed on the stator support 410.

[0076] The stator armature winding 420 is disposed on the side wall of the first accommodating cavity 110 away from the mounting channel 130 via the stator bracket 410, so as to form a motor component with the first permanent magnet 500 disposed on the side of the first weight part 310 away from the rotating part 330, and the charging and discharging of the flywheel energy storage device is realized through the motor component.

[0077] Furthermore, the stator armature winding 420 is placed in the stator slot of the stator support 410 in a concentrated winding distribution manner.

[0078] Please see Figure 2 In one embodiment, the flywheel energy storage device further includes a second magnetic shielding element 720, which is disposed on the side of the first weight part 310 away from the rotating part 330, and the first permanent magnet 500 is annular and sleeved on the second magnetic shielding element 720.

[0079] The second magnetic shielding member 720, located on the side of the first weight part 310 away from the rotating part 330, can not only reduce the demagnetization of the first permanent magnet 500, but also provide a positioning effect for the first permanent magnet 500.

[0080] Furthermore, the second magnetic shielding component 720 is disc-shaped. The disc-shaped second magnetic shielding component 720 is used to accommodate the annular first permanent magnet 500 to prevent the first permanent magnet 500 from moving and affecting the alignment accuracy with the stator module 400, thereby avoiding affecting the charging and discharging effect of the flywheel energy storage device.

[0081] In one embodiment, the sum of the masses of the first weight part 310, the second magnetic shielding member 720, and the first permanent magnet 500 is equal to the sum of the masses of the second weight part 320, the first magnetic shielding member 710, and the fourth permanent magnet 620. The magnetic bearing assembly 200 is located at the center of the rotating part 330 so that the mass distribution at both ends of the rotor 300 is uniform, and the rotor 300 is prevented from swaying or vibrating during rotation.

[0082] In one embodiment, both the first magnetic shielding element 710 and the second magnetic shielding element 720 are magnetic shielding rings.

[0083] In one embodiment, the sum of the masses of the first weight portion 310, the second magnetic shielding component 720, and the first permanent magnet 500 is equal to the sum of the masses of the second weight portion 320, the first magnetic shielding component 710, and the second permanent magnet 230.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A flywheel energy storage device, characterized in that, include: The mounting housing has a first receiving cavity, a mounting channel, and a second receiving cavity that are sequentially connected along its first direction; A magnetic bearing assembly disposed in the mounting channel; The rotor includes a rotating part, a first weight part, and a second weight part. The rotating part is located within the mounting channel and rotatably engages with the magnetic bearing assembly. The first weight part is located at one end of the rotating part along the first direction, and the second weight part is located at the other end of the rotating part along the first direction. The first weight part is located in the first accommodating cavity, and the second weight part is located in the second accommodating cavity. The mass of the first weight part and the mass of the second weight part are equal. The magnetic bearing assembly is located at the center of the rotating part. A stator module, wherein the stator module is disposed on the side wall of the first accommodating cavity away from the mounting channel; A first permanent magnet is disposed on the side of the first weight portion away from the rotating portion; A third permanent magnet and a fourth permanent magnet, wherein the third permanent magnet is disposed on the side wall of the second accommodating cavity away from the mounting channel, and the fourth permanent magnet is disposed on the side of the second weight part away from the rotating part, wherein the magnetic poles of the side of the third permanent magnet facing the fourth permanent magnet are opposite to the magnetic poles of the side of the fourth permanent magnet facing the third permanent magnet; as well as The first magnetic shielding component is located on the side of the second weight portion away from the rotating portion, and the fourth permanent magnet is ring-shaped and sleeved on the outside of the first magnetic shielding component.

2. The flywheel energy storage device according to claim 1, characterized in that, The first weight portion, the second weight portion, and the rotating portion are all cylindrical, and the diameters of the first weight portion and the second weight portion are both larger than the diameter of the rotating portion.

3. The flywheel energy storage device according to claim 1, characterized in that, The mounting housing includes a housing and a partition. The housing has a receiving space, and the partition is disposed within the receiving space to divide the receiving space into a first receiving cavity and a second receiving cavity. The mounting channel is opened in the partition so that the first receiving cavity communicates with the second receiving cavity through the mounting channel.

4. The flywheel energy storage device according to claim 1, characterized in that, The magnetic bearing assembly includes a first bearing module and a second bearing module, which are spaced apart along the first direction on the side wall of the mounting channel, and the rotating part passes through the first bearing module and the second bearing module.

5. The flywheel energy storage device according to claim 4, characterized in that, The first bearing module includes a first magnetic ring and a first magnetic bearing winding. The outer ring surface of the first magnetic ring is disposed on the side wall of the mounting channel, and the first magnetic bearing winding is disposed on the inner wall of the first magnetic ring. The second bearing module includes a second magnetic ring and a second magnetic bearing winding. The outer ring surface of the second magnetic ring is disposed on the side wall of the mounting channel, and the second magnetic bearing winding is disposed on the inner wall of the second magnetic ring. The magnetic bearing assembly further includes a second permanent magnet, which is disposed between the first magnetic ring and the second magnetic ring.

6. The flywheel energy storage device according to claim 5, characterized in that, The first magnetic bearing winding is placed in the toothed portion of the first magnetic ring, and the second magnetic bearing winding is placed in the toothed portion of the second magnetic ring.

7. The flywheel energy storage device according to claim 1, characterized in that, The inner wall of the installation channel is provided with an annular groove, and the magnetic bearing assembly is disposed in the annular groove.

8. The flywheel energy storage device according to claim 1, characterized in that, The second accommodating cavity has a boss on the side wall away from the mounting channel, and the third permanent magnet is ring-shaped and sleeved on the boss.

9. The flywheel energy storage device according to claim 1, characterized in that, The stator module includes a stator support and a stator armature winding. The stator support is located on the side wall of the first accommodating cavity away from the mounting channel, and the stator armature winding is located on the stator support.

10. The flywheel energy storage device according to claim 1, characterized in that, The flywheel energy storage device further includes a second magnetic shielding component, which is located on the side of the first weight portion away from the rotating portion, and the first permanent magnet is ring-shaped and sleeved on the outside of the second magnetic shielding component.

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