Flywheel energy storage permanent magnet device

Abstract

The present application relates to a flywheel energy storage permanent magnet device, which can solve the problems of limited energy storage capacity and severe electromagnetic loss in no-load standby in flywheel energy storage systems in the prior art. The flywheel energy storage permanent magnet device includes a rotating shaft mechanism; an inner stator, the inner stator including a stator winding arranged around the rotating shaft mechanism, a memory permanent magnet, and a first adjustment coil, the first adjustment coil being used to change the magnetic flux of the memory permanent magnet when powered; an outer rotor, the outer rotor being arranged around the inner stator and rotatably connected to the rotating shaft mechanism; a first permanent magnet ring; a second permanent magnet ring; and a second adjustment coil, the first permanent magnet ring, the second permanent magnet ring, and the second adjustment coil being all arranged on one side of the outer rotor along the extension direction of the axis, the first permanent magnet ring and the second permanent magnet ring being used to generate a combined magnetic field force to cause the outer rotor to levitate relative to the inner stator, and the second adjustment coil being used to adjust the combined magnetic field force when powered to cause the outer rotor to remain suspended relative to the inner stator.

Description

Technical Field

[0001] The present application relates to the technical field of flywheel energy storage, and in particular to a flywheel energy storage permanent magnet device. Background Art

[0002] Permanent magnet synchronous motors (PMSMs) are widely used in flywheel energy storage systems due to their high efficiency, high power density, and low non-excitation copper loss. However, due to the strength of their rotor silicon steel laminations, the maximum speed of their rotors is relatively low. Therefore, in related art, flywheel energy storage systems using PMSMs often employ an outer stator-inner rotor topology.

[0003] However, the aforementioned outer stator-inner rotor topology reduces the rotor's rotational inertia, limiting the energy storage capacity of the flywheel energy storage system. At the same time, the permanent magnet magnetic field of the permanent magnet synchronous motor cannot be adjusted when running at high speed, which will cause serious no-load standby electromagnetic losses, increase the system's self-discharge rate, and reduce the system's energy conversion efficiency. Summary of the Invention

[0004] Based on this, it is necessary to provide a flywheel energy storage permanent magnet device to address the problems of limited energy storage capacity and serious no-load standby electromagnetic loss in the flywheel energy storage system in the related technology.

[0005] A flywheel energy storage permanent magnet device, comprising:

[0006] Rotating shaft mechanism;

[0007] an inner stator, the inner stator comprising a stator winding arranged around the rotating shaft mechanism, a memory permanent magnet, and a first adjustment coil, the first adjustment coil being used to change the magnetic flux of the memory permanent magnet when powered;

[0008] an outer rotor, the outer rotor being disposed around the inner stator and rotatably connected to the rotating shaft mechanism so as to be able to rotate around the axis of the rotating shaft mechanism;

[0009] a first permanent magnet ring;

[0010] Second permanent magnet ring;

[0011] The second regulating coil, the first permanent magnet ring, the second permanent magnet ring and the second regulating coil are all arranged on one side of the outer rotor along the extension direction of the axis, the first permanent magnet ring and the second permanent magnet ring are used to generate a combined magnetic field force so that the outer rotor is suspended relative to the inner stator, and the second regulating coil is used to adjust the combined magnetic field force when powered on so that the outer rotor remains suspended relative to the inner stator.

[0012] In one embodiment, the outer rotor includes at least two sliced ​​iron cores, and the sliced ​​iron cores are evenly spaced around the inner stator.

[0013] In one embodiment, the sliced ​​iron core has a first flange and a second flange at both ends along the axial direction, respectively, and the flywheel energy storage permanent magnet device also includes a first fastening ring and a second fastening ring, the first fastening ring is used to be sleeved on the first flange of each of the sliced ​​iron cores, and the second fastening ring is used to be sleeved on the second flange of each of the sliced ​​iron cores to limit the radial position of each of the sliced ​​iron cores relative to the rotating shaft mechanism.

[0014] In one embodiment, the outer rotor includes a rotor mechanism and a sleeve, and the sleeve is sleeved on the outer rotor mechanism along the axial direction.

[0015] In one embodiment, when the outer rotor is configured to include at least two sliced ​​iron cores, or when the outer rotor is configured to include a rotor mechanism and a sleeve, the outer rotor is provided with first rotor teeth and second rotor teeth arranged at intervals along the circumferential direction, and adjacent first rotor teeth and second rotor teeth are cyclically staggered along the extension direction of the axis.

[0016] In one embodiment, the stator winding includes a first winding and a second winding spaced apart along the extension direction of the axis, the memory permanent magnet and the first adjustment coil are both sandwiched between the first winding and the second winding, and the first adjustment coil is arranged around the memory permanent magnet.

[0017] In one embodiment, the inner stator includes an armature winding, the first winding includes a first stator core and a first magnetic yoke, the first stator core is arranged around the first magnetic yoke, the second winding includes a second stator core and a second magnetic yoke, the second stator core is arranged around the second magnetic yoke, and the armature winding is wound around the first stator core and the second stator core.

[0018] In one embodiment, along the radial direction of the rotating shaft mechanism, the first permanent magnet ring, the second permanent magnet ring and the second adjustment coil are arranged at intervals, the second adjustment coil is arranged between the first permanent magnet ring and the second permanent magnet ring, and the radial spacing between the first permanent magnet ring and the second adjustment coil is greater than the radial spacing between the second permanent magnet ring and the second adjustment coil.

[0019] In one embodiment, the flywheel energy storage permanent magnet device includes a bearing seat, which surrounds and is fixed to the rotating shaft mechanism. The bearing seat is provided with a first groove and a second groove in the radial direction, the first groove is used to install the first permanent magnet ring, and the second groove is used to install the second adjustment coil. The second permanent magnet ring is arranged on the outer rotor.

[0020] In one embodiment, the flywheel energy storage permanent magnet device further includes a composite flywheel, which surrounds and is fixedly connected to the outer rotor.

[0021] The above-mentioned flywheel energy storage permanent magnet device is arranged by the outer rotor surrounding the inner stator to realize the inner stator-outer rotor topology, which helps to increase the rotational inertia of the outer rotor, thereby increasing the energy storage capacity of the flywheel energy storage permanent magnet device; in addition, the memory permanent magnet can change the setting of the magnetic flux under the adjustment action of the first adjustment coil, so that in the transition state when the flywheel energy storage permanent magnet device changes from a loaded state to a no-load state, the memory permanent magnet does not show magnetism to the outside, which helps to eliminate the no-load standby electromagnetic loss, reduce the system self-discharge rate, and improve the system energy conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of a flywheel energy storage permanent magnet device in one embodiment of the present application is shown.

[0023] Figure 2 A cross-sectional view of a flywheel energy storage permanent magnet device in another embodiment of the present application is shown.

[0024] Figure 3 A cross-sectional view of a flywheel energy storage permanent magnet device in another embodiment of the present application is shown.

[0025] Figure 4 A schematic structural diagram of a sliced ​​iron core of a flywheel energy storage permanent magnet device in one embodiment of the present application is shown.

[0026] Figure 5 A schematic diagram of the magnetic circuit of the flywheel energy storage permanent magnet device in one embodiment of the present application is shown when the second regulating coil is not in effect.

[0027] Figure 6 A schematic diagram of the magnetic circuit of the flywheel energy storage permanent magnet device when the second regulating coil is in effect in one embodiment of the present application is shown.

[0028] Figure 7 A schematic diagram of a memory permanent magnet circuit of a flywheel energy storage permanent magnet device in one embodiment of the present application is shown.

[0029] Figure 8 A schematic diagram of a memory permanent magnet circuit and an adjustment magnetic circuit is shown when the motor of a flywheel energy storage permanent magnet device in one embodiment of the present application is in a demagnetization state.

[0030] Figure 9 An exploded schematic diagram of the outer rotor of a flywheel energy storage permanent magnet device in one embodiment of the present application is shown.

[0031] Figure 10 Shown Figure 9 Schematic diagram of the outer rotor assembly shown.

[0032] Explanation of Figure Numbers

[0033] 1-1, first support shaft; 1-2, second support shaft; 1-3, third support shaft; 1-4, axis; 2-1, first permanent magnet ring; 2-2, second adjustment coil; 2-3, bearing seat; 3-1-1, first magnetic yoke; 3-1-2, second magnetic yoke; 3-2-1, first stator core; 3-2-2, second stator core; 3-3, memory permanent magnet; 3-4, first adjustment coil; 3-5, armature winding; 4-1, second permanent magnet ring; 4-2, sliced ​​core; 4-2-1 , rotor mechanism; 4-2-2, sleeve; 4-2-11, first rotor tooth; 4-2-21, second rotor tooth; 4-3-1, first fastening ring; 4-3-2, second fastening ring; 4-4, composite flywheel; 5-1, first auxiliary mechanical bearing; 5-2, second auxiliary mechanical bearing; 6-1, first sealing end cover; 6-2, second sealing end cover; 6-3, sealing barrel; 8-1, second permanent magnetic circuit; 8-2, first permanent magnetic circuit; 9-1, memory permanent magnetic circuit; 9-2, adjustment magnetic circuit. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0036] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0037] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, 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 embodiment.

[0040] Considering that most existing flywheel energy storage systems use permanent magnet synchronous motors with an external stator and internal rotor topology, which limits the energy storage capacity of the flywheel energy storage system, and the permanent magnet magnetic field of the permanent magnet synchronous motor cannot be adjusted when running at high speed, this will cause serious electromagnetic losses during no-load standby, increase the system's self-discharge rate, and reduce the system's energy conversion efficiency. This application provides a flywheel energy storage permanent magnet device that not only helps to increase the energy storage capacity but also reduces electromagnetic losses during no-load standby, facilitating its application and promotion.

[0041] Specifically, please refer to Figure 1 One embodiment of the present application provides a flywheel energy storage permanent magnet device, which may include a rotating shaft mechanism, an inner stator, an outer rotor, a first permanent magnet ring 2-1, a second permanent magnet ring 4-1, and a second regulating coil 2-2. The rotating shaft mechanism may include a first support shaft 1-1, a second support shaft 1-2, and a third support shaft 1-3. The inner stator includes a stator winding arranged around the rotating shaft mechanism, a memory permanent magnet 3-3, and a first regulating coil 3-4.

[0042] Combine Figure 1 、 Figure 3 and Figure 4 As shown, the outer rotor may include, but is not limited to, at least two sliced ​​iron cores 4-2, each sliced ​​iron core 4-2 being evenly spaced around the inner stator; or, in combination with Figure 9 and Figure 10 As shown, the outer rotor may include, but is not limited to, a rotor mechanism 4-2-1 and a sleeve 4-2-2. The sleeve 4-2-2 is sleeved around the outer rotor mechanism 4-2-1 along the axis 1-4. In each of the aforementioned embodiments, the outer rotor is disposed around the inner stator and is rotatably connected to the shaft mechanism, enabling the outer rotor to rotate about the shaft mechanism's axis 1-4. The first adjustment coil 3-4 is used to change the magnetic flux of the memory permanent magnet 3-3 when energized. The first permanent magnet ring 2-1, the second permanent magnet ring 4-1, and the second adjustment coil 2-2 are all disposed on one side of the outer rotor along the axis 1-4. The first permanent magnet ring 2-1 and the second permanent magnet ring 4-1 are used to generate a combined magnetic field force to levitate the outer rotor relative to the inner stator. The second adjustment coil 2-2 is used to adjust the combined magnetic field force to maintain the outer rotor levitated relative to the inner stator when energized.

[0043] It is worth noting that the memory permanent magnet 3-3 can change the magnetic flux under the regulation of the first regulating coil 3-4. Figure 7 As shown, when a short-time pulse current is passed through the first regulating coil 3-4, the memory permanent magnet 3-3 is fully magnetized and generates a memory permanent magnetic circuit 9-1, which serves as the operating magnetic field of the flywheel energy storage permanent magnet device, thereby meeting the rated output power requirement of the flywheel energy storage permanent magnet device. At this time, the magnetic field inside the air gap of the flywheel energy storage permanent magnet device exhibits a unipolar characteristic.

[0044] like Figure 8 As shown, when the flywheel energy storage permanent magnet device is in the process of transitioning from a loaded state to an unloaded state, the first regulating coil 3-4 can provide a DC pulse magnetic field in the opposite direction to the magnetic field generated by the memory permanent magnet 3-3, thereby achieving the purpose of regulating the memory permanent magnet circuit 9-1. In other words, combined with Figure 8 As shown, in the transition state when the flywheel energy storage permanent magnet device changes from a loaded state to a no-load state, the memory permanent magnet circuit 9-1 and the regulating magnetic circuit 9-2 are in opposite directions, so that the memory permanent magnet 3-3 does not show magnetism to the outside, thereby achieving no excitation copper loss in the flywheel energy storage permanent magnet device under rated load and no standby electromagnetic loss in the no-load state.

[0045] The above-mentioned flywheel energy storage permanent magnet device is arranged by the outer rotor surrounding the inner stator to realize the inner stator-outer rotor topology, which helps to increase the rotational inertia of the outer rotor, and then increases the energy storage capacity of the flywheel energy storage permanent magnet device; in addition, the memory permanent magnet 3-3 can change the setting of the magnetic flux under the adjustment action of the first adjustment coil 3-4, so that in the transition state when the flywheel energy storage permanent magnet device changes from a loaded state to a no-load state, the memory permanent magnet 3-3 does not show magnetism to the outside, which helps to eliminate the no-load standby electromagnetic loss, reduce the system self-discharge rate, and improve the system energy conversion efficiency.

[0046] Optionally, combined Figure 1 As shown, the first support shaft 1-1, the second support shaft 1-2 and the third support shaft 1-3 are all made of non-magnetic high-strength metal materials, and are coaxially arranged from top to bottom along the axis 1-4.

[0047] It is worth noting that in the aforementioned embodiment, the outer rotor may include, but is not limited to, at least two sliced ​​cores 4-2, each sliced ​​core 4-2 being evenly spaced around the inner stator. This helps to improve the ease of assembly and maintenance of the outer rotor. Specifically, adjacent sliced ​​cores 4-2 are identical or have a mirror-symmetric relationship along their contact surfaces.

[0048] Optionally, combined Figure 1 and Figure 2 As shown, the sliced ​​iron core 4-2 has a first flange and a second flange at both ends along the axis 1-4, respectively. The flywheel energy storage permanent magnet device also includes a first fastening ring 4-3-1 and a second fastening ring 4-3-2. The first fastening ring 4-3-1 is used to be sleeved on the first flange of each sliced ​​iron core 4-2, and the second fastening ring 4-3-2 is used to be sleeved on the second flange of each sliced ​​iron core 4-2 to limit the radial position of each sliced ​​iron core 4-2 relative to the rotating shaft mechanism, which helps to improve the installation stability of each sliced ​​iron core 4-2.

[0049] It is worth noting that re-referring Figure 9 In the aforementioned embodiment, the outer rotor may include, but is not limited to, a rotor mechanism 4-2-1 and a sleeve 4-2-2. Sleeve 4-2-2 is sleeved over outer rotor mechanism 4-2-1 along axis 1-4. The sleeve 4-2-2 is sleeved over outer rotor mechanism 4-2-1. This sleeved arrangement of rotor mechanism 4-2-1 and sleeve 4-2-2 helps improve structural integrity and, consequently, the rotational stability of the outer rotor. Specifically, in this embodiment, rotor mechanism 4-2-1 and sleeve 4-2-2 can each be provided with a perforation, and after sleeved arrangement, can be passed through the perforations and restrained on the shaft mechanism.

[0050] Optionally, the rotor mechanism 4-2-1 and the sleeve 4-2-2 are interference fit, which helps to ensure that the contact surfaces of the rotor mechanism 4-2-1 and the sleeve 4-2-2 do not slip relative to each other, thereby improving the stability of the rotor mechanism 4-2-1 and the sleeve 4-2-2 being mutually sleeved.

[0051] Optionally, the rotor mechanism 4-2-1 and the sleeve 4-2-2 are both made of high-strength metal materials with good magnetic conductivity through forging, and both have the same axial sleeve length, which helps to reduce the difficulty of sleeve installation.

[0052] Optionally, combined Figure 4 and Figure 9 As shown, when the outer rotor is configured to include at least two sliced ​​iron cores 4-2, or when the outer rotor is configured to include a rotor mechanism 4-2-1 and a sleeve 4-2-2, the outer rotor is provided with first rotor teeth 4-2-11 and second rotor teeth 4-2-21 arranged at intervals along the circumferential direction, and adjacent first rotor teeth 4-2-11 and second rotor teeth 4-2-21 are cyclically staggered along the extension direction of the axis 1-4, thereby meeting the arrangement requirements of the rotor teeth in the actual operation of the outer rotor.

[0053] It is worth noting that, combined with Figure 5 As shown, when the outer rotor is configured to include at least two sliced ​​cores 4-2, the first rotor teeth 4-2-11 and the second rotor teeth 4-2-21 can be combined with each other to form the aforementioned cyclic staggered arrangement effect.

[0054] Optionally, the first rotor tooth 4-2-11 and the second rotor tooth 4-2-21 have exactly the same size parameters, which helps to improve structural uniformity.

[0055] Optionally, the sliced ​​core 4 - 2 is forged from high-strength alloy steel with good magnetic conductivity.

[0056] Optionally, combined Figure 2As shown, the stator winding includes a first winding and a second winding spaced apart along the extension direction of the axis 1-4. The memory permanent magnet 3-3 and the first adjustment coil 3-4 are both sandwiched between the first winding and the second winding, and the first adjustment coil 3-4 is arranged around the memory permanent magnet 3-3. The inner stator may include an armature winding 3-5. The first winding may include a first stator core 3-2-1 and a first magnetic yoke 3-1-1, with the first stator core 3-2-1 arranged around the first magnetic yoke 3-1-1. The second winding may include a second stator core 3-2-2 and a second magnetic yoke 3-1-2, with the second stator core 3-2-2 arranged around the second magnetic yoke 3-1-2. The armature winding 3-5 is wound around the first stator core 3-2-1 and the second stator core 3-2-2.

[0057] Specifically, the aforementioned arrangement of two windings, the first winding and the second winding, helps to improve the operating efficiency and performance of the flywheel energy storage permanent magnet device. In addition, the memory permanent magnet 3-3 and the first adjustment coil 3-4 are both sandwiched between the first winding and the second winding, which helps to optimize the structural layout and improve the structural compactness. Therefore, the aforementioned arrangement can help achieve efficient drive while effectively taking into account the size of the flywheel energy storage permanent magnet device, thereby improving the applicability of multiple application scenarios.

[0058] Optionally, the first magnetic yoke 3-1-1 and the second magnetic yoke 3-1-2 have identical structural parameters and are both made of materials with good magnetic conductivity. Optionally, the first stator core 3-2-1 and the second stator core 3-2-2 have identical structural parameters and are both made of axially laminated silicon steel sheets. Furthermore, the first stator core 3-2-1 and the second stator core 3-2-2 can optionally have a slotless or slotted structure.

[0059] Furthermore, when the first stator core 3-2-1 and the second stator core 3-2-2 are of a slotless structure, the armature winding 3-5 is physically connected to the first stator core 3-2-1 and the second stator core 3-2-2 by pouring epoxy resin; when the first stator core 3-2-1 and the second stator core 3-2-2 are of a slotted structure, the armature winding 3-5 is directly embedded in the aforementioned slot structure.

[0060] Optionally, the first magnetic yoke 3-1-1 and the first stator core 3-2-1 have the same axial length.

[0061] Optionally, the armature windings 3 - 5 are multi-phase symmetrical windings.

[0062] Optionally, combined Figure 1As shown, along the radial direction of the rotating shaft mechanism, the first permanent magnet ring 2-1, the second permanent magnet ring 4-1 and the second regulating coil 2-2 are arranged at intervals, the second regulating coil 2-2 is arranged between the first permanent magnet ring 2-1 and the second permanent magnet ring 4-1, and the radial spacing between the first permanent magnet ring 2-1 and the second regulating coil 2-2 is greater than the radial spacing between the second permanent magnet ring 4-1 and the second regulating coil 2-2, so that the second regulating coil 2-2 can adjust the combined magnetic field force generated by the first permanent magnet ring 2-1 and the second permanent magnet ring 4-1.

[0063] Specifically, combined Figure 1 As shown, when the first permanent magnet ring 2-1 is arranged on the outside in the radial direction and the second permanent magnet ring 4-1 is arranged on the inside in the radial direction, as shown in FIG. Figure 5 From the perspective shown, the first permanent magnet ring 2-1 will generate a first permanent magnet circuit 8-2 on its right side. It can be understood that the second permanent magnet circuit 8-1 will generate a second permanent magnet circuit 8-1 on its left side. The first permanent magnet circuit 8-2 and the second permanent magnet circuit 8-1 have the same magnetizing direction, and the magnetic circuits generated by the two are in a parallel relationship. In this way, they can jointly generate a combined magnetic field force to achieve axial unloading of the outer rotor, so that the outer rotor is suspended relative to the inner stator. In this way, the support of the outer rotor by mechanical protection bearings can be avoided, the mechanical friction loss of the bearings is eliminated, the risk of failure of the support bearings is reduced, and the reliability of the flywheel energy storage device is increased.

[0064] Furthermore, when the combined magnetic field force generated by the joint action of the first permanent magnetic ring 2-1 and the second permanent magnetic ring 4-1 is too large or too small, since the radial spacing between the first permanent magnetic ring 2-1 and the second regulating coil 2-2 is greater than the radial spacing between the second permanent magnetic ring 4-1 and the second regulating coil 2-2, the magnetic circuit generated by the second regulating coil 2-2 can be in parallel with the first permanent magnetic circuit 8-2, while the magnetic circuit generated by the second regulating coil 2-2 can be in series with the second permanent magnetic circuit 8-1. Then, the magnetic field generated by the second regulating coil 2-2 can be used to magnetize and demagnetize the second permanent magnetic ring 4-1 in series, thereby achieving the purpose of flexibly adjusting the magnitude of the combined magnetic field force generated by the axial hybrid magnetic bearing, overcoming the problem in the prior art that the permanent magnetic field cannot be adjusted, causing the rotor to shift and resulting in increased friction.

[0065] For example, when the combined magnetic force generated by the first permanent magnet ring 2-1 and the second permanent magnet ring 4-1 is too large, the magnetic field generated by the second regulating coil 2-2 demagnetizes the second permanent magnet ring 4-1. At this time, the magnetic circuit corresponding to the axial hybrid magnetic bearing is Figure 6The first permanent magnet circuit 8-2 shown in FIG. 1 reduces the total magnetic flux generated by the axial hybrid magnetic bearing, directly resulting in a reduction in the corresponding resultant magnetic field force, thereby achieving flexible adjustment of the resultant magnetic field force. It should be noted that the aforementioned axial hybrid magnetic bearing refers to the combined structure of the first permanent magnet ring 2-1, the second permanent magnet ring 4-1, and the second adjustment coil 2-2.

[0066] Optionally, combined Figure 1 As shown, the flywheel energy storage permanent magnet device may include a bearing seat 2-3, which surrounds and is fixed to the rotating shaft mechanism. The bearing seat 2-3 is provided with a first groove and a second groove in the radial direction, the first groove is used to install the first permanent magnet ring 2-1, and the second groove is used to install the second adjustment coil 2-2. The second permanent magnet ring 4-1 is arranged on the outer rotor, so that the relative positions of the first permanent magnet ring 2-1, the second permanent magnet ring 4-1 and the second adjustment coil 2-2 can be reasonably arranged.

[0067] Optionally, the bearing seat 2-3 is coaxially assembled with the first support shaft 1-1 and tightly connected by bolts.

[0068] Optionally, combined Figure 1 As shown, the flywheel energy storage permanent magnet device may include a composite flywheel 4-4, which surrounds and is fixedly connected to the outer rotor, thereby realizing an integrated structure of the composite flywheel 4-4 and the outer rotor, which helps to improve the structural compactness of the flywheel energy storage permanent magnet device and reduce the volume of the flywheel energy storage permanent magnet device.

[0069] Optionally, the composite flywheel 4 - 4 is made of high-strength composite material.

[0070] Optionally, the composite flywheel 4 - 4 and the outer rotor are assembled using an interference fit.

[0071] Optionally, combined Figure 1 As shown, the flywheel energy storage permanent magnet device may include a first auxiliary mechanical bearing 5-1 and a second auxiliary mechanical bearing 5-2, and the first auxiliary mechanical bearing 5-1 and the second auxiliary mechanical bearing 5-2 are respectively arranged at the two ends of the inner stator along the axis 1-4 direction, and the first auxiliary mechanical bearing 5-1 and the second auxiliary mechanical bearing 5-2 are respectively used to provide bearing support for the two ends of the outer flywheel, and the first auxiliary mechanical bearing 5-1 and the second auxiliary mechanical bearing 5-2 both have the ability to withstand axial loads and radial loads, which helps to improve the structural reliability of the flywheel energy storage permanent magnet device and the structural protection of the flywheel energy storage permanent magnet device.

[0072] Optionally, the first auxiliary mechanical bearing 5 - 1 and the second auxiliary mechanical bearing 5 - 2 may be angular contact ball bearings.

[0073] Optionally, combined Figure 1As shown, the outer side of the outer rotor is a sealing cylinder, which includes a first sealing end cover 6-1, a second sealing end cover 6-2 and a sealing barrel 6-3, and the three are coaxially assembled. The sealing cylinder is used to enclose the outer rotor, the inner stator, the axial hybrid magnetic bearing and the rotating shaft mechanism inside, thereby maintaining the vacuum environment inside the flywheel energy storage permanent magnet device, reducing the impact of the external environment and improving the energy conversion efficiency.

[0074] Optionally, the first sealing end cover 6-1, the first support shaft 1-1, the sealing barrel 6-3, the second sealing end cover 6-2 and the third support shaft 1-3 are sealed to each other, so that each connection has good sealing to ensure that the inside of the flywheel energy storage permanent magnet device is in a vacuum-sealed environment.

[0075] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0076] The above-described embodiments merely represent several implementation methods of the present application. 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 a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A flywheel energy storage permanent magnet device, characterized in that: The flywheel energy storage permanent magnet device comprises: Rotating shaft mechanism; an inner stator, the inner stator comprising a stator winding arranged around the rotating shaft mechanism, a memory permanent magnet, and a first adjustment coil, the first adjustment coil being used to change the magnetic flux of the memory permanent magnet when powered; an outer rotor, the outer rotor being disposed around the inner stator and rotatably connected to the rotating shaft mechanism so as to be able to rotate around the axis of the rotating shaft mechanism; a first permanent magnet ring; Second permanent magnet ring; a second regulating coil, wherein the first permanent magnet ring, the second permanent magnet ring, and the second regulating coil are all arranged on one side of the outer rotor along the extension direction of the axis, the first permanent magnet ring and the second permanent magnet ring are used to generate a combined magnetic field force to suspend the outer rotor relative to the inner stator, and the second regulating coil is used to adjust the combined magnetic field force to keep the outer rotor suspended relative to the inner stator in a power-on state; The stator winding includes a first winding and a second winding spaced apart along the extending direction of the axis, the memory permanent magnet and the first adjustment coil are both sandwiched between the first winding and the second winding, and the first adjustment coil is arranged around the memory permanent magnet; In a radial direction of the rotating shaft mechanism, the first permanent magnetic ring, the second permanent magnetic ring, and the second regulating coil are spaced apart, the second regulating coil is disposed between the first permanent magnetic ring and the second permanent magnetic ring, and the radial spacing between the first permanent magnetic ring and the second regulating coil is greater than the radial spacing between the second permanent magnetic ring and the second regulating coil; The flywheel energy storage permanent magnet device also includes a bearing seat, which surrounds and is fixed to the rotating shaft mechanism. The bearing seat is provided with a first groove and a second groove in the radial direction, respectively. The first groove is used to install the first permanent magnet ring, and the second groove is used to install the second adjustment coil. The second permanent magnet ring is arranged on the outer rotor.

2. The flywheel energy storage permanent magnet device according to claim 1, characterized in that: The outer rotor includes at least two sliced ​​iron cores, and the sliced ​​iron cores are evenly spaced around the inner stator.

3. The flywheel energy storage permanent magnet device according to claim 2, characterized in that: The sliced ​​iron core has a first flange and a second flange at both ends along the axial direction, respectively. The flywheel energy storage permanent magnet device also includes a first fastening ring and a second fastening ring. The first fastening ring is used to be sleeved on the first flange of each of the sliced ​​iron cores, and the second fastening ring is used to be sleeved on the second flange of each of the sliced ​​iron cores to limit the radial position of each of the sliced ​​iron cores relative to the rotating shaft mechanism.

4. The flywheel energy storage permanent magnet device according to claim 1, characterized in that: The outer rotor includes a rotor mechanism and a sleeve, and the sleeve is sleeved on the outer rotor mechanism along the axial direction.

5. The flywheel energy storage permanent magnet device according to any one of claims 2 to 4, characterized in that: When the outer rotor is configured to include at least two sliced ​​iron cores, or when the outer rotor is configured to include a rotor mechanism and a sleeve, the outer rotor is provided with first rotor teeth and second rotor teeth arranged at intervals along the circumferential direction, and adjacent first rotor teeth and second rotor teeth are cyclically staggered along the extension direction of the axis.

6. The flywheel energy storage permanent magnet device according to claim 1, characterized in that: The inner stator includes an armature winding, the first winding includes a first stator core and a first magnetic yoke, the first stator core is arranged around the first magnetic yoke, the second winding includes a second stator core and a second magnetic yoke, the second stator core is arranged around the second magnetic yoke, and the armature winding is wound around the first stator core and the second stator core.

7. The flywheel energy storage permanent magnet device according to claim 1, characterized in that: The flywheel energy storage permanent magnet device further includes a composite flywheel, which surrounds and is fixedly connected to the outer rotor.

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