Flywheel energy storage device

Abstract

The invention relates to the technical field of energy storage equipment, in particular to a flywheel energy storage device which comprises a flywheel rotor, a first armature winding, a second armature winding, a first permanent magnet and a second permanent magnet, and the first armature winding, the second armature winding, the first permanent magnet and the second permanent magnet are arranged around the axis of the flywheel rotor. The first permanent magnet is arranged on the face, opposite to the radial direction, of the flywheel rotor and extends in the axial direction of the flywheel rotor, the first armature winding is arranged on the outer side of the first permanent magnet in a sleeving mode at intervals, and the second permanent magnet is arranged on the face, opposite to the axial direction, of the flywheel rotor and extends in the radial direction of the flywheel rotor. The second armature winding is arranged along the axial direction of the flywheel rotor at an interval of the second permanent magnet and is arranged corresponding to the second armature winding. In conclusion, the flywheel energy storage device can have high output power so as to meet the use scene of high power and large capacity.

Description

TECHNICAL FIELD

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

[0002] At present, the flywheel energy storage device is a device that converts electrical energy into kinetic energy of a flywheel rotor for storage, and then converts the kinetic energy into electrical energy for output when needed.

[0003] The traditional iron core flywheel energy storage device has core loss in standby state, resulting in large standby loss of the flywheel energy storage system, thereby reducing the energy conversion efficiency of the flywheel energy storage system. The iron core flywheel energy storage device does not have an iron core, which eliminates the core loss and significantly reduces the standby energy consumption, thereby effectively improving the energy conversion efficiency. However, the design without an iron core increases the effective air gap length of the motor, which reduces the air gap flux density, thereby causing the output power of the flywheel energy storage device to be low, making it difficult for the iron core flywheel energy storage device to meet the demand of high-power and large-capacity scenarios. SUMMARY

[0004] The purpose of the present application is to provide a flywheel energy storage device to solve the technical problem that the output power of the iron core flywheel energy storage device is low, making it difficult for the iron core flywheel energy storage device to meet the demand of high-power and large-capacity scenarios.

[0005] In order to achieve the above-mentioned purpose, the present application provides a flywheel energy storage device, comprising a flywheel rotor, a first armature winding, a second armature winding, a first permanent magnet and a second permanent magnet, the first armature winding, the second armature winding, the first permanent magnet and the second permanent magnet are arranged around the axis of the flywheel rotor, the first permanent magnet is arranged on the face of the flywheel rotor relative to its radial direction, the first permanent magnet is arranged along the axial direction of the flywheel rotor, the first armature winding is arranged on the outer side of the first permanent magnet, the second permanent magnet is arranged on the face of the flywheel rotor relative to its axial direction, the second permanent magnet is arranged along the radial direction of the flywheel rotor, and the second armature winding is arranged along the axial direction of the flywheel rotor and corresponds to the second permanent magnet.

[0006] Optionally, the flywheel rotor comprises a first rotor part and a second rotor part connected in sequence, the first permanent magnet is arranged on the outer wall of the first rotor part, and the second permanent magnet is arranged on the end face of the second rotor part.

[0007] Optionally, the diameter of the first rotor part is smaller than the diameter of the second rotor part.

[0008] Optionally, the second permanent magnet is arranged on the end face of the second rotor part close to the first rotor part.

[0009] Optionally, the first permanent magnet is arranged axially apart from the second rotor part along the flywheel rotor, and the second permanent magnet is arranged radially apart from the first rotor part along the flywheel rotor.

[0010] Optionally, a shielding ring is arranged between the first permanent magnet and the second rotor part, and / or a shielding ring is arranged between the second permanent magnet and the first rotor part.

[0011] Optionally, the second rotor part is provided with a receiving groove near the end face of the first rotor part, and the second permanent magnet is arranged in the receiving groove. The second permanent magnet is flush with the end face of the second rotor part near the first rotor part in the axial direction of the flywheel rotor, or the second permanent magnet is completely arranged in the receiving groove.

[0012] Optionally, the flywheel rotor is arranged such that the face where the first permanent magnet is arranged is adjacent to the face where the second permanent magnet is arranged. The first permanent magnet comprises a plurality of first N-pole magnetic blocks and a plurality of first S-pole magnetic blocks, the plurality of first N-pole magnetic blocks and the plurality of first S-pole magnetic blocks are arranged around the axis of the flywheel rotor, and one first S-pole magnetic block is arranged between two adjacent first N-pole magnetic blocks. The second permanent magnet comprises a plurality of second N-pole magnetic blocks and a plurality of second S-pole magnetic blocks, the plurality of second N-pole magnetic blocks and the plurality of second S-pole magnetic blocks are arranged around the axis of the flywheel rotor, and one second S-pole magnetic block is arranged between two adjacent second N-pole magnetic blocks. The number of the first N-pole magnetic blocks, the first S-pole magnetic blocks, the second N-pole magnetic blocks and the second S-pole magnetic blocks is the same, the first N-pole magnetic blocks and the second S-pole magnetic blocks are arranged one by one in correspondence, and the first S-pole magnetic blocks and the second N-pole magnetic blocks are arranged one by one in correspondence.

[0013] Optionally, the adjacent first N-pole magnetic blocks and the first S-pole magnetic blocks are connected, the adjacent second N-pole magnetic blocks and the second S-pole magnetic blocks are connected, and the joint surface between the first N-pole magnetic blocks and the first S-pole magnetic blocks is coplanar with the joint surface between the corresponding second N-pole magnetic blocks and the second S-pole magnetic blocks.

[0014] Optionally, the first stator support and the second stator support are further included, the first stator support is arranged in a sleeved manner on the outside of the first permanent magnet, the first armature winding is fixedly arranged on the first stator support, the second stator support is arranged axially apart from the second permanent magnet along the flywheel rotor, and the second armature winding is fixedly arranged on the second stator support.

[0015] Optionally, the second stator support is arranged in a sleeved manner on the outside of the first stator support.

[0016] Optionally, one face of the first stator support relative to the flywheel rotor is flush with one face of the second stator support relative to the flywheel rotor.

[0017] Optionally, the first stator support comprises an inner sleeve, an outer sleeve and a plurality of first connecting plates, the outer sleeve is spaced and sleeved outside the inner sleeve, a plurality of the first connecting plates are spaced and arranged between the outer sleeve and the inner sleeve and arranged around the first permanent magnet, the first connecting plates are connected to the outer side wall of the inner sleeve and the inner side wall of the outer sleeve, the first armature winding comprises a plurality of first wire groups, the first wire groups are wound on the first connecting plates, and the first wire groups and the first connecting plates correspond one by one.

[0018] Optionally, the second stator support comprises two support plates and a plurality of second connecting plates, the two support plates are spaced and arranged along the flywheel rotor, and the plurality of second connecting plates are spaced and arranged between the two support plates, the second connecting plates are connected to the two support plates, the second armature winding comprises a plurality of second wire groups, the second wire groups are wound on the second connecting plates, and the second wire groups and the second connecting plates correspond one by one.

[0019] Optionally, the first permanent magnet comprises a plurality of first magnetic blocks, the first armature winding comprises a plurality of first wire groups, the number of the first magnetic blocks is the same as that of the first wire groups. The second permanent magnet comprises a plurality of second magnetic blocks, the second armature winding comprises a plurality of second wire groups, and the number of the second magnetic blocks is the same as that of the second wire groups.

[0020] Optionally, it further comprises a shell, a first end cover, a second end cover, a first cover plate and a second cover plate, the shell is internally provided with a containing cavity, the flywheel rotor, the first armature winding, the second armature winding, the first permanent magnet and the second permanent magnet are arranged in the containing cavity, the shell is respectively provided with a first shell hole and a second shell hole penetrating into the containing cavity relative to two side faces of the flywheel rotor, the first end cover is covered on the first shell hole, the second end cover is covered on the second shell hole, the first end cover is provided with a first through hole along the axis of the flywheel rotor, the second end cover is provided with a second through hole along the axis of the flywheel rotor, the first cover plate is covered on the first through hole, the second cover plate is covered on the second through hole, and the two ends of the flywheel rotor are respectively rotationally connected to the first through hole and the second through hole.

[0021] Compared with the prior art, the flywheel energy storage device provided by the embodiment of the application has the following beneficial effects: The first permanent magnet and the second permanent magnet arranged on the flywheel rotor and around the axis of the flywheel rotor respectively extend along the axial direction and the radial direction of the flywheel rotor, and the first armature winding and the second armature winding are arranged correspondingly to the first permanent magnet and the second permanent magnet, so that the first armature winding can adapt to and utilize the radial magnetic flux and cut the radial magnetic flux, and the second armature winding can adapt to and utilize the axial magnetic flux and cut the axial magnetic flux, so as to realize electromagnetic conversion in two directions, and the extension length of the armature winding in the flywheel energy storage device can be effectively increased, the utilization rate of the flywheel energy storage device on the magnetic field energy and the output power of the flywheel energy storage device are effectively improved, in addition, during normal operation, the two armature windings work cooperatively, when one of the two armature windings fails, the other one can work temporarily alone, so that the system can avoid complete paralysis, and the system reliability and fault tolerance are relatively high, and the flywheel energy storage device can have relatively high output power to meet the use scene of high power and large capacity. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the flywheel energy storage device.

[0023] Figure 2 It is a structural schematic diagram of the flywheel energy storage device cut off one fourth.

[0024] Figure 3 It is an explosion view of the flywheel energy storage device.

[0025] Figure 4 It is a front view of the flywheel energy storage device.

[0026] Figure 5 It is Figure 4 the sectional view of A-A.

[0027] Figure 6 It is Figure 5 the local enlarged view of B part.

[0028] Figure 7 It is a sectional view of the flywheel energy storage device ignoring the flywheel rotor, the armature winding, the permanent magnet and the stator support.

[0029] Figure 8 It is a structural schematic diagram of the flywheel energy storage device ignoring the shell, the end cover and the cover plate.

[0030] Figure 9 It is a structural schematic diagram of the flywheel rotor provided with the first permanent magnet and the second permanent magnet.

[0031] Figure 10 It is a structural schematic diagram of the flywheel rotor provided with the first permanent magnet and the second permanent magnet.

[0032] Reference numerals: 1. Flywheel rotor; 11. First rotor section; 12. Second rotor section; 121. Receiving slot; 2. First armature winding; 21. First wire group; 3. Second armature winding; 31. Second wire group; 4. First permanent magnet; 41. First N pole magnet; 42. First S pole magnet; 5. Second permanent magnet; 51. Second N pole magnet; 52. Second S pole magnet; 6. Shielding ring; 7. First stator support; 71. Inner sleeve; 72. Outer sleeve; 73. First connecting plate; 8. Second stator support; 81. Frame plate; 82. Second connecting plate; 9. Housing; 91. First housing hole; 92. Second housing hole; 93. Receiving cavity; 10. First end cover; 101. First through hole; 20. Second end cover; 201. Second through hole; 30. First cover plate; 40. Second cover plate. Detailed Implementation

[0033] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0034] In the description of this invention, it should be understood that the terms "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention 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 invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] like Figures 1 to 10As shown, a flywheel energy storage device of the present invention includes a flywheel rotor 1, a first armature winding 2, a second armature winding 3, a first permanent magnet 4, and a second permanent magnet 5. The first armature winding 2, the second armature winding 3, the first permanent magnet 4, and the second permanent magnet 5 are arranged around the axis of the flywheel rotor 1. The first permanent magnet 4 is disposed on the surface of the flywheel rotor 1 relative to its radial direction and extends along the axial direction of the flywheel rotor 1. The first armature winding 2 is spaced and sleeved on the outside of the first permanent magnet 4. The second permanent magnet 5 is disposed on the surface of the flywheel rotor 1 relative to its axial direction and extends along the radial direction of the flywheel rotor 1. The second armature winding 3 is spaced apart from the second permanent magnet 5 along the axial direction of the flywheel rotor 1 and is arranged corresponding to the second armature winding 3.

[0037] In the above technical solution, the first permanent magnet 4 and the second permanent magnet 5, which are disposed on the flywheel rotor 1 and arranged around the axis of the flywheel rotor 1, extend along the axial and radial directions of the flywheel rotor 1, respectively. The first armature winding 2 and the second armature winding 3 are respectively disposed corresponding to the first permanent magnet 4 and the second permanent magnet 5, so that the first armature winding 2 can adapt to and utilize the radial magnetic flux and cut the radial magnetic flux, and the second armature winding 3 can adapt to and utilize the axial magnetic flux and cut the axial magnetic flux, so as to realize electromagnetic conversion in two directions. It can also effectively increase the extension length of the armature winding in the flywheel energy storage device, effectively improve the utilization rate of magnetic field energy and the output power of the flywheel energy storage device. In addition, during normal operation, the two armature windings work together. When one of the two armature windings fails, the other can work temporarily independently to avoid complete system paralysis, so as to make the system highly reliable and fault-tolerant. In summary, the flywheel energy storage device of the present invention can have high output power to meet the application scenarios of high power and large capacity.

[0038] Among them, the flywheel rotor 1 is rotatable along its axis, the first permanent magnet 4 and the second permanent magnet 5 are fixed on the flywheel rotor 1 and rotate together with the flywheel rotor 1, while the first armature winding 2 and the second armature winding 3 are fixed.

[0039] As an example of this embodiment, the flywheel rotor 1 includes a first rotor section 11 and a second rotor section 12 connected in sequence. The first permanent magnet 4 is disposed on the outer side wall of the first rotor section 11, and the second permanent magnet 5 is disposed on the end face of the second rotor section 12.

[0040] The first rotor section 11 and the second rotor section 12 give the flywheel rotor 1 a stepped structure, and the first permanent magnet 4 and the second permanent magnet 5 are respectively disposed on two components with different diameters, so as to optimize the size distribution of the flywheel rotor 1 and improve the rationality of the layout of permanent magnets and armature windings.

[0041] As an example of this embodiment, the diameter of the first rotor section 11 is smaller than the diameter of the second rotor section 12, so that the first permanent magnet 4 and the first armature winding 2 are disposed at positions corresponding to the axial direction of the flywheel rotor 1 on the outer periphery of the second rotor section 12, so as to reduce the space (radial space of the flywheel rotor 1) required by the first permanent magnet 4 and the first armature winding 2, thereby improving the compactness of the flywheel energy storage device.

[0042] As an example of this embodiment, the second permanent magnet 5 is disposed on the end face of the second rotor portion 12 near the first rotor portion 11, such that the second permanent magnet 5 and the second armature winding 3 are disposed on the outside of the first rotor portion 11, so as to reduce the space occupied by the second permanent magnet 5 and the second armature winding 3 (the space along the axial direction of the flywheel rotor 1), thereby improving the compactness of the flywheel energy storage device.

[0043] As an example of this embodiment, the first permanent magnet 4 is disposed axially at a distance from the second rotor portion 12 along the flywheel rotor 1, and the second permanent magnet 5 is disposed radially at a distance from the first rotor portion 11 along the flywheel rotor 1.

[0044] The interval setting ensures that the magnetic flux in the two directions is distributed in a preset direction, reducing magnetic flux shunting loss.

[0045] As an example of this embodiment, a shielding ring 6 is provided between the first permanent magnet 4 and the second rotor portion 12, and / or, a shielding ring 6 is provided between the second permanent magnet 5 and the first rotor portion 11.

[0046] When the shielding ring 6 is made of a non-magnetic or low-magnetic-permeability material (such as aluminum or copper), it can block the cross magnetic flux between the first permanent magnet 4 and the second permanent magnet 5, preventing the radial and axial magnetic flux from interfering with and canceling each other out, ensuring the independence of the two magnetic fluxes, and improving the cutting efficiency of their respective armature windings. When the shielding ring 6 is made of a conductive material, it can utilize the eddy current effect to absorb stray magnetic fields, reducing the induced losses of ineffective magnetic flux on the rotor metal components.

[0047] As an example of this embodiment, the second rotor portion 12 is provided with a receiving groove 121 on the end face near the first rotor portion 11, and the second permanent magnet 5 is disposed in the receiving groove 121; The second permanent magnet 5 is flush with the end face of the second rotor portion 12 near the first rotor portion 11 on the axial side relative to the flywheel rotor 1, or the second permanent magnet 5 is completely located within the receiving groove 121.

[0048] The second permanent magnet 5 can be stably and reliably fixed in the receiving groove 121, preventing the second permanent magnet 5 from shifting due to centrifugal force during high-speed rotation. Furthermore, this concealed design can protect the second permanent magnet 5 from external collisions and extend its service life. In addition, the second permanent magnet 5 being flush with or concealed on the end face can reduce the air resistance encountered by the rotor during rotation, reduce mechanical losses, and indirectly improve overall efficiency.

[0049] As an example of this embodiment, the flywheel rotor 1 has the surface where the first permanent magnet 4 is disposed adjacent to the surface where the second permanent magnet 5 is disposed. The first permanent magnet 4 includes a plurality of first N-pole magnetic blocks 41 and a plurality of first S-pole magnetic blocks 42, which are arranged around the axis of the flywheel rotor 1, with a first S-pole magnetic block 42 between two adjacent first N-pole magnetic blocks 41. The second permanent magnet 5 includes a plurality of second N-pole magnetic blocks 51 and a plurality of second S-pole magnetic blocks 52, which are arranged around the axis of the flywheel rotor 1, with a second S-pole magnetic block 52 between two adjacent second N-pole magnetic blocks 51. The number of first N-pole magnetic blocks 41, first S-pole magnetic blocks 42, second N-pole magnetic blocks 51, and second S-pole magnetic blocks 52 are the same, with the first N-pole magnetic blocks 41 and second S-pole magnetic blocks 52 arranged in a one-to-one correspondence, and the first S-pole magnetic blocks 42 and second N-pole magnetic blocks 51 arranged in a one-to-one correspondence.

[0050] In this configuration, the outward-facing side of the first N-pole magnetic block 41 is the N-pole, the outward-facing side of the first S-pole magnetic block 42 is the S-pole, the side of the second N-pole magnetic block 51 facing away from the second rotor section 12 is the N-pole, and the side of the second S-pole magnetic block 52 facing away from the second rotor section 12 is the S-pole. Furthermore, the corresponding arrangement of the first N-pole magnetic block 41 and the second S-pole magnetic block 52 can mean that a radial direction of the flywheel rotor points to the first N-pole magnetic block 41 and also points to the corresponding second S-pole magnetic block 52. The corresponding arrangement of the first S-pole magnetic block 42 and the second N-pole magnetic block 51 is similar. This allows the magnetic blocks to have at least two magnetic flux paths, which can effectively reduce magnetic field resistance and increase magnetic field density. Specifically, taking the magnetic flux path of any first N-pole magnetic block 41 as an example, one magnetic flux path returns through the adjacent first S-pole magnetic block 42, and the other magnetic flux path returns through the corresponding second S-pole magnetic block 52.

[0051] As an example of this embodiment, in order to obtain the minimum magnetic field resistance and the maximum magnetic field density, the adjacent first N-pole magnetic blocks 41 and the first S-pole magnetic blocks 42 are connected to form a ring-shaped first permanent magnet 4, and the adjacent second N-pole magnetic blocks 51 and the second S-pole magnetic blocks 52 are connected to form a ring-shaped second permanent magnet 5. The contact surface between the first N-pole magnetic blocks 41 and the first S-pole magnetic blocks 42 is coplanar with the contact surface between the second N-pole magnetic blocks 51 and the second S-pole magnetic blocks 52, and the axis of the flywheel rotor 1 is located on each contact surface.

[0052] As an example of this embodiment, it also includes a first stator support 7 and a second stator support 8. The first stator support 7 is spaced apart and sleeved on the outside of the first permanent magnet 4. The first armature winding 2 is fixedly disposed on the first stator support 7. The second stator support 8 is disposed along the axial direction of the flywheel rotor 1 at intervals from the second permanent magnet 5. The second armature winding 3 is fixedly disposed on the second stator support 8.

[0053] The first stator support 7 and the second stator support 8 replace the iron core to support and fix the first armature winding 2 and the second armature winding 3. Furthermore, the first stator support 7 and the second stator support 8 are made of insulating material to avoid short circuits.

[0054] As an example of this embodiment, the second stator support 8 is sleeved on the outside of the first stator support 7 to achieve a coaxial nested layout of the two armature windings, thereby reducing the overall volume of the device and improving the compactness of the device.

[0055] As an example of this embodiment, the first stator support 7 and the second stator support 8 are flush with one surface of the flywheel rotor 1 relative to the axial direction of the flywheel rotor 1, so as to reduce axial redundant space and further improve the structural compactness.

[0056] As an example of this embodiment, the first stator support 7 includes an inner sleeve 71, an outer sleeve 72, and a plurality of first connecting plates 73. The outer sleeve 72 is spaced out on the outer side of the inner sleeve 71. The plurality of first connecting plates 73 are spaced out between the outer sleeve 72 and the inner sleeve 71 and are arranged around the first permanent magnet 4. The first connecting plates 73 are connected to the outer side wall of the inner sleeve 71 and the inner side wall of the outer sleeve 72. The first armature winding 2 includes a plurality of first wire groups 21. The first wire groups 21 are wound on the first connecting plates 73, and the first wire groups 21 and the first connecting plates 73 correspond one-to-one.

[0057] The inner sleeve 71, the outer sleeve 72, and the connecting plate form a sleeve-like frame structure to give the first stator support 7 high rigidity, enabling it to withstand magnetic field forces and vibrations during high-speed rotation and ensuring long-term operational reliability.

[0058] As an example of this embodiment, the second stator support 8 includes two frame plates 81 and a plurality of second connecting plates 82. The two frame plates 81 are spaced apart along the axial direction of the flywheel rotor 1, and the plurality of second connecting plates 82 are spaced apart between the two frame plates 81. The second connecting plates 82 are connected to the two frame plates 81. The second armature winding 3 includes a plurality of second wire groups 31. The second wire groups 31 are wound on the second connecting plates 82, and the second wire groups 31 and the second connecting plates 82 correspond one-to-one.

[0059] The two frame plates 81 form a ring-shaped frame structure with a sandwich layer, so that the second stator support 8 has high rigidity, so as to avoid displacement of the second armature winding 3 during operation, which would lead to a large change in the air gap.

[0060] As an example of this embodiment, the first permanent magnet 4 includes a plurality of first magnetic blocks, the first armature winding 2 includes a plurality of first wire groups 21, and the number of first magnetic blocks and first wire groups 21 is the same; the second permanent magnet 5 includes a plurality of second magnetic blocks, the second armature winding 3 includes a plurality of second wire groups 31, and the number of second magnetic blocks and second wire groups 31 is the same.

[0061] The first magnetic block and the first wire group 21 are in one-to-one correspondence, and the second magnetic block and the second wire group 31 are in one-to-one correspondence, so as to realize a one-to-one magnetic flux cutting relationship. The magnetic field generated by each magnetic block can be fully utilized by the corresponding wire group (avoiding uneven magnetic flux distribution caused by multiple wire groups sharing a magnetic block), so as to improve the magnetic field energy utilization rate; in addition, the matching of quantities can also simplify the control logic.

[0062] In addition, the first N-pole magnetic block 41 and the first S-pole magnetic block 42 belong to the first magnetic block, and the second N-pole magnetic block 51 and the second S-pole magnetic block 52 belong to the second magnetic block.

[0063] As an example of this embodiment, it also includes a housing 9, a first end cap 10, a second end cap 20, a first cover plate 30, and a second cover plate 40. The housing 9 has a receiving cavity 93. The flywheel rotor 1, the first armature winding 2, the second armature winding 3, the first permanent magnet 4, and the second permanent magnet 5 are disposed in the receiving cavity 93. The housing 9 has a first shell hole 91 and a second shell hole 92 that penetrate into the receiving cavity 93 on two sides relative to the flywheel rotor 1, respectively. The first end cap 10 is disposed on the first shell hole 91, and the second end cap 20 is disposed on the second shell hole 92. The first end cap 10 has a first through hole 101 along the axis of the flywheel rotor 1, and the second end cap 20 has a second through hole 201 along the axis of the flywheel rotor 1. The first cover plate 30 is disposed on the first through hole 101, and the second cover plate 40 is disposed on the second through hole 201. The two ends of the flywheel rotor 1 are rotatably connected to the first through hole 101 and the second through hole 201, respectively.

[0064] The housing 9 forms a closed space that can be evacuated (to reduce air resistance and flywheel wear) or filled with inert gas (for heat dissipation) to meet the requirements of high-speed operation. The end caps and cover plates protect the internal components and improve safety. Furthermore, the through holes of the end caps provide stable rotational support for the flywheel rotor 1 (which can be a bearing or magnetic levitation structure), ensuring the coaxiality of the rotor when it rotates at high speed and reducing vibration and loss caused by eccentricity.

[0065] As an example of this embodiment, fixed setting and fixed connection refer to the fixed relative positional relationship of two components, including but not limited to fixing by connectors, fixing by welding, fixing by adhesive, fixing by integral molding, and fixing by snap-fit ​​connection.

[0066] As an example of this embodiment, a rotatable connection or rotatable setting refers to the fact that two connected components can rotate, including but not limited to connections through bearings or connections through clearance fits.

[0067] As an example of this embodiment, the connectors include, but are not limited to, fasteners, straps, ropes, pneumatic connectors, hydraulic connectors, flanges, Velcro, and buttons.

[0068] In summary, the embodiments of the present invention provide a flywheel energy storage device, the technical effects of which are as follows: In the flywheel energy storage device of the present invention, a first permanent magnet 4 and a second permanent magnet 5, disposed on the flywheel rotor 1 and arranged around the axis of the flywheel rotor 1, extend along the axial and radial directions of the flywheel rotor 1, respectively. A first armature winding 2 and a second armature winding 3 are respectively disposed corresponding to the first permanent magnet 4 and the second permanent magnet 5, enabling the first armature winding 2 to adapt to and utilize radial magnetic flux and cut radial magnetic flux, and the second armature winding 3 to adapt to and utilize axial magnetic flux and cut axial magnetic flux, thereby achieving electromagnetic conversion in both directions. This effectively increases the extension length of the armature windings within the flywheel energy storage device, effectively improving the utilization rate of magnetic field energy and the output power of the flywheel energy storage device. Furthermore, during normal operation, the two armature windings work collaboratively; when one armature winding fails, the other can temporarily operate independently, preventing complete system failure and resulting in high system reliability and fault tolerance. In summary, the flywheel energy storage device of the present invention can possess high output power to meet the application scenarios of high power and large capacity.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A flywheel energy storage device, characterized in that, The device includes a flywheel rotor (1), a first armature winding (2), a second armature winding (3), a first permanent magnet (4), and a second permanent magnet (5). The first armature winding (2), the second armature winding (3), the first permanent magnet (4), and the second permanent magnet (5) are arranged around the axis of the flywheel rotor (1). The first permanent magnet (4) is located on the radial surface of the flywheel rotor (1) and extends along the axial direction of the flywheel rotor (1). The first armature winding (2) is spaced and sleeved on the outside of the first permanent magnet (4). The second permanent magnet (5) is located on the axial surface of the flywheel rotor (1) and extends along the radial direction of the flywheel rotor (1). The second armature winding (3) is spaced from the second permanent magnet (5) along the axial direction of the flywheel rotor (1) and is arranged corresponding to the second armature winding (3).

2. The apparatus according to claim 1, characterized in that, The flywheel rotor (1) includes a first rotor section (11) and a second rotor section (12) connected in sequence. The first permanent magnet (4) is disposed on the outer side wall of the first rotor section (11), and the second permanent magnet (5) is disposed on the end face of the second rotor section (12).

3. The apparatus according to claim 2, characterized in that, The diameter of the first rotor section (11) is smaller than the diameter of the second rotor section (12).

4. The apparatus according to claim 2, characterized in that, The second permanent magnet (5) is disposed on the end face of the second rotor part (12) near the first rotor part (11).

5. The apparatus according to claim 4, characterized in that, The first permanent magnet (4) is disposed axially at a distance from the second rotor portion (12) along the flywheel rotor (1), and the second permanent magnet (5) is disposed radially at a distance from the first rotor portion (11) along the flywheel rotor (1).

6. The apparatus according to claim 5, characterized in that, A shielding ring (6) is provided between the first permanent magnet (4) and the second rotor (12), and / or, a shielding ring (6) is provided between the second permanent magnet (5) and the first rotor (11).

7. The apparatus according to claim 4, characterized in that, The second rotor section (12) has a receiving groove (121) on its end face near the first rotor section (11), and the second permanent magnet (5) is disposed in the receiving groove (121); The second permanent magnet (5) is flush with the axial surface of the flywheel rotor (1) with the end face of the second rotor part (12) near the first rotor part (11), or the second permanent magnet (5) is completely located in the receiving groove (121).

8. The apparatus according to claim 1 or 4, characterized in that, The flywheel rotor (1) has the surface on which the first permanent magnet (4) is disposed adjacent to the surface on which the second permanent magnet (5) is disposed; The first permanent magnet (4) includes a plurality of first N pole magnetic blocks (41) and a plurality of first S pole magnetic blocks (42). The plurality of first N pole magnetic blocks (41) and the plurality of first S pole magnetic blocks (42) are arranged around the axis of the flywheel rotor (1), and a first S pole magnetic block (42) is provided between two adjacent first N pole magnetic blocks (41). The second permanent magnet (5) includes a plurality of second N-pole magnetic blocks (51) and a plurality of second S-pole magnetic blocks (52). The plurality of second N-pole magnetic blocks (51) and the plurality of second S-pole magnetic blocks (52) are arranged around the axis of the flywheel rotor (1), and a second S-pole magnetic block (52) is provided between two adjacent second N-pole magnetic blocks (51). The number of the first N-pole magnetic block (41), the first S-pole magnetic block (42), the second N-pole magnetic block (51), and the second S-pole magnetic block (52) are the same. The first N-pole magnetic block (41) and the second S-pole magnetic block (52) are set in a one-to-one correspondence. The first S-pole magnetic block (42) and the second N-pole magnetic block (51) are set in a one-to-one correspondence.

9. The apparatus according to claim 8, characterized in that, The adjacent first N-pole magnetic block (41) and the first S-pole magnetic block (42) are connected, and the adjacent second N-pole magnetic block (51) and the second S-pole magnetic block (52) are connected. The contact surface between the first N-pole magnetic block (41) and the first S-pole magnetic block (42) is coplanar with the contact surface between the corresponding second N-pole magnetic block (51) and the second S-pole magnetic block (52).

10. The apparatus according to claim 1, characterized in that, It also includes a first stator support (7) and a second stator support (8). The first stator support (7) is spaced out on the outside of the first permanent magnet (4). The first armature winding (2) is fixedly mounted on the first stator support (7). The second stator support (8) is spaced out from the second permanent magnet (5) along the axial direction of the flywheel rotor (1). The second armature winding (3) is fixedly mounted on the second stator support (8).

11. The apparatus according to claim 10, characterized in that, The second stator support (8) is sleeved on the outside of the first stator support (7).

12. The apparatus according to claim 11, characterized in that, The first stator support (7) is flush with one side of the flywheel rotor (1) in the axial direction and the second stator support (8) is flush with one side of the flywheel rotor (1) in the axial direction.

13. The apparatus according to claim 10, characterized in that, The first stator support (7) includes an inner sleeve (71), an outer sleeve (72) and a plurality of first connecting plates (73). The outer sleeve (72) is spaced out on the outside of the inner sleeve (71). The plurality of first connecting plates (73) are spaced out between the outer sleeve (72) and the inner sleeve (71) and are arranged around the first permanent magnet (4). The first connecting plates (73) are connected to the outer side wall of the inner sleeve (71) and the inner side wall of the outer sleeve (72). The first armature winding (2) includes a plurality of first wire groups (21). The first wire groups (21) are wound on the first connecting plates (73). The first wire groups (21) and the first connecting plates (73) correspond one-to-one.

14. The apparatus according to claim 10, characterized in that, The second stator support (8) includes two frame plates (81) and multiple second connecting plates (82). The two frame plates (81) are spaced apart along the axial direction of the flywheel rotor (1). The multiple second connecting plates (82) are spaced apart between the two frame plates (81). The second connecting plates (82) are connected to the two frame plates (81). The second armature winding (3) includes multiple second wire groups (31). The second wire groups (31) are wound on the second connecting plates (82). The second wire groups (31) and the second connecting plates (82) correspond one-to-one.

15. The apparatus according to claim 1, characterized in that, The first permanent magnet (4) includes a plurality of first magnetic blocks, and the first armature winding (2) includes a plurality of first wire groups (21), the number of first magnetic blocks and the number of first wire groups (21) are the same; The second permanent magnet (5) includes a plurality of second magnetic blocks, and the second armature winding (3) includes a plurality of second wire groups (31), the number of the second magnetic blocks and the number of the second wire groups (31) are the same.

16. The apparatus according to claim 1, characterized in that, It also includes a housing (9), a first end cap (10), a second end cap (20), a first cover plate (30), and a second cover plate (40). The housing (9) has a receiving cavity (93). The flywheel rotor (1), the first armature winding (2), the second armature winding (3), the first permanent magnet (4), and the second permanent magnet (5) are disposed in the receiving cavity (93). The housing (9) has a first shell hole (91) and a second shell hole (92) on two sides relative to the flywheel rotor (1), respectively, which penetrate into the receiving cavity (93). The first end cap (10) The first end cap (10) is provided with a first through hole (101) along the axis of the flywheel rotor (1), and the second end cap (20) is provided with a second through hole (201) along the axis of the flywheel rotor (1). The first cover plate (30) is provided with the first through hole (101), and the second cover plate (40) is provided with the second through hole (201). The two ends of the flywheel rotor (1) are respectively rotatably connected to the first through hole (101) and the second through hole (201).

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