Flywheel energy storage permanent magnet device

Abstract

The flywheel energy storage permanent magnet device can solve the problems that in the prior art, the energy storage capacity of a flywheel energy storage system is limited, and no-load standby electromagnetic loss is serious. The flywheel energy storage permanent magnet device comprises a rotating shaft mechanism. The inner stator comprises a stator winding arranged around the rotating shaft mechanism, a memory permanent magnet and a first adjusting coil, and the first adjusting coil is used for changing the magnetic flux of the memory permanent magnet in a power-on state; the outer rotor is arranged around the inner stator, and the outer rotor is rotatably connected with the rotating shaft mechanism; a first permanent magnet ring; a second permanent magnet ring; the second adjusting coil, the first permanent magnet ring, the second permanent magnet ring and the second adjusting coil are arranged on one side of the outer rotor in the extending direction of the axis, and the first permanent magnet ring and the second permanent magnet ring are used for generating combined magnetic field force so that the outer rotor can suspend relative to the inner stator. The second adjusting coil is used for adjusting the combined magnetic field force in a power-on state so that the outer rotor can be kept 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 are widely used in flywheel energy storage systems due to their advantages such as high efficiency, high power density and no excitation copper loss. Due to the strength of the rotor silicon steel sheet of the permanent magnet synchronous motor, the maximum speed of the rotor of the permanent magnet synchronous motor is relatively low. Therefore, in the relevant technology, the flywheel energy storage system using permanent magnet synchronous motors is mostly an outer stator-inner rotor topology.

[0003] However, the aforementioned outer stator-inner rotor topology reduces the rotor's rotational inertia and limits 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 it is 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, the 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 regulating coil, wherein the first regulating coil is used to change the magnetic flux of the memory permanent magnet in a power-on state;

[0008] An outer rotor, which is disposed around the inner stator and is rotatably connected to the rotating shaft mechanism so that the outer rotor can rotate around the axis of the rotating shaft mechanism;

[0009] The first permanent magnet ring;

[0010] The second permanent magnetic 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 in the power-on state so that the outer rotor remains suspended relative to the inner stator.

[0012] In one embodiment, the outer rotor includes at least two sliced ​​cores, and each of the sliced ​​cores is 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 radially limit 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 ​​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 inner 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, 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.

[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 with 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 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 the load state to the 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] FIG1 shows a cross-sectional view of a flywheel energy storage permanent magnet device in one embodiment of the present application.

[0023] FIG2 shows a cross-sectional view of a flywheel energy storage permanent magnet device in another embodiment of the present application.

[0024] FIG3 shows a cross-sectional view of a flywheel energy storage permanent magnet device in another embodiment of the present application.

[0025] FIG4 shows a schematic structural diagram of a sliced ​​iron core of a flywheel energy storage permanent magnet device in an embodiment of the present application.

[0026] FIG5 shows a schematic diagram of the magnetic circuit of the flywheel energy storage permanent magnet device when the second regulating coil is not in effect in one embodiment of the present application.

[0027] FIG6 shows 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.

[0028] FIG. 7 shows a schematic diagram of a memory permanent magnet circuit of a flywheel energy storage permanent magnet device in an embodiment of the present application.

[0029] FIG8 shows a schematic diagram of a memory permanent magnet circuit and an adjustment magnetic circuit when the motor of a flywheel energy storage permanent magnet device is in a demagnetization state in one embodiment of the present application.

[0030] FIG. 9 shows an exploded schematic diagram of the outer rotor of a flywheel energy storage permanent magnet device in one embodiment of the present application.

[0031] FIG. 10 is a schematic diagram showing an assembly of the outer rotor shown in FIG. 9 .

[0032] Description 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] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present 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 the present 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 the present application.

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

[0037] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it 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. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in 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 a central 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 a central element at the same time. 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 implementation method.

[0040] Considering that most existing flywheel energy storage systems use permanent magnet synchronous motors with an outer stator-inner 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 it is running at high speed, this will cause serious electromagnetic losses in no-load standby mode, increase the self-discharge rate of the system, and reduce the energy conversion efficiency of the system. The present application provides a flywheel energy storage permanent magnet device, which not only helps to increase the energy storage capacity, but also can reduce the electromagnetic losses in no-load standby mode, which is convenient for application and promotion.

[0041] Specifically, please refer to Figure 1. An 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] As shown in FIG. 1 , FIG. 3 and FIG. 4 , 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; or, as shown in FIG. 9 and FIG. 10 , the outer rotor may include but is not limited to a rotor mechanism 4-2-1 and a sleeve 4-2-2, and the sleeve 4-2-2 is sleeved on the outer rotor mechanism 4-2-1 along the axis 1-4. The outer rotors in the aforementioned embodiments are all arranged around the inner stator, and the outer rotor is rotatably connected to the shaft mechanism, so that the outer rotor can rotate around the axis 1-4 of the shaft mechanism. The first regulating coil 3-4 is used to change the magnetic flux of the memory permanent magnet 3-3 when powered on. The first permanent magnet ring 2-1, the second permanent magnet ring 4-1 and the second adjustment coil 2-2 are all arranged on one side of the outer rotor along the extension direction of 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 so that the outer rotor is suspended relative to the inner stator, and the second adjustment coil 2-2 is used to adjust the combined magnetic field force when powered on so that the outer rotor remains suspended relative to the inner stator.

[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. As shown in Figure 7, when a short-time pulse current is passed into the first regulating coil 3-4, the memory permanent magnet 3-3 can be in a fully magnetized state, and a memory permanent magnetic circuit 9-1 is generated as the working magnetic field of the flywheel energy storage permanent magnet device to meet the output power requirements of the flywheel energy storage permanent magnet device in the rated state. At this time, the magnetic field inside the air gap of the flywheel energy storage permanent magnet device presents a unipolar characteristic.

[0044] As shown in FIG8, when the flywheel energy storage permanent magnet device is in the process of changing from a load state to a no-load 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, so as to achieve the purpose of regulating the memory permanent magnet magnetic circuit 9-1. In other words, in conjunction with FIG8, in the transition state where the flywheel energy storage permanent magnet device changes from a load state to a no-load state, the memory permanent magnet magnetic circuit 9-1 is in the opposite direction to the regulating magnetic circuit 9-2, so that the memory permanent magnet 3-3 does not show magnetism to the outside, thereby realizing that the flywheel energy storage permanent magnet device has no excitation copper loss under the rated load state and no standby electromagnetic loss under the no-load state.

[0045] The above-mentioned flywheel energy storage permanent magnet device, through the outer rotor being arranged around the inner stator to realize the form of inner stator-outer rotor topology, 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 the load state to the 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, as shown in FIG. 1 , 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 in sequence from top to bottom along the axis 1 - 4 .

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

[0048] Optionally, in combination with Figures 1 and 2, the sliced ​​iron core 4-2 has a first flange and a second flange at both ends along the axis 1-4, respectively, and 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 radially limit 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, referring to FIG. 9 again, in the aforementioned embodiment where the outer rotor may include, but is not limited to, a rotor mechanism 4-2-1 and a sleeve 4-2-2, and the sleeve 4-2-2 is sleeved on the outer rotor mechanism 4-2-1 along the axis 1-4, the rotor mechanism 4-2-1 and the sleeve 4-2-2 are sleeved together, which helps to improve the structural integrity and the rotational stability of the outer rotor. Specifically, in this embodiment, the rotor mechanism 4-2-1 and the sleeve 4-2-2 can be provided with a through hole respectively, and after being sleeved, they can be penetrated through the through hole and limited on the rotating 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 the two have the same axial sleeve length, which helps to reduce the difficulty of sleeve installation.

[0052] Optionally, in combination with Figures 4 and 9, when the outer rotor is configured to include at least two sliced ​​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 satisfying the arrangement requirements of the rotor teeth in the actual operation of the outer rotor.

[0053] It is worth noting that, in combination with FIG. 5 , 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 unity.

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

[0056] Optionally, as shown in FIG. 2 , the inner stator winding includes a first winding and a second winding arranged at intervals 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. Wherein, 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, and the first stator core 3-2-1 is 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, the second stator core 3-2-2 is arranged around the second magnetic yoke 3-1-2, and 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 above-mentioned setting 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 compactness of the structure. Therefore, the above-mentioned setting can help to achieve efficient driving 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 exactly the same 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 exactly the same structural parameters and are both made of silicon steel sheets stacked along the axial direction. In addition, optionally, the first stator core 3-2-1 and the second stator core 3-2-2 can also be a toothless structure or a toothed structure.

[0059] Furthermore, when the first stator core 3-2-1 and the second stator core 3-2-2 are of a tooth-free 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 toothed structure, the armature winding 3-5 is directly embedded in the aforementioned toothed 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, in combination with what is shown in FIG1 , 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, in combination with Figure 1, when the first permanent magnet ring 2-1 is arranged on the radially outer side and the second permanent magnet ring 4-1 is arranged on the radially inner side, as shown in the perspective of Figure 5, the first permanent magnet ring 2-1 will generate a first permanent magnet magnetic circuit 8-2 on its right side. It can be understood that the second permanent magnet magnetic circuit 8-1 will generate a second permanent magnet magnetic circuit 8-1 on its left side. The first permanent magnet magnetic circuit 8-2 and the second permanent magnet magnetic circuit 8-1 have the same magnetizing direction, and the magnetic circuits generated by the two are in parallel. In this way, a combined magnetic field force can be jointly generated 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 can be avoided by mechanical protection bearings, the mechanical friction loss of the bearings is eliminated, the risk of failure of the supporting 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 size of the combined magnetic field force generated by the axial hybrid magnetic bearing, thereby overcoming the problem in the prior art that the permanent magnetic field is not adjustable, causing the rotor to shift and increase friction.

[0065] For example, 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, the magnetic field generated by the second regulating coil 2-2 demagnetizes the second permanent magnetic ring 4-1. At this time, the magnetic circuit corresponding to the axial hybrid magnetic bearing is the first permanent magnetic circuit 8-2 shown in Figure 6. In this way, the total magnetic flux generated by the axial hybrid magnetic bearing becomes smaller, which directly leads to a decrease in the corresponding combined magnetic field force, thereby achieving flexible and adjustable combined magnetic field force. It should be noted that the aforementioned axial hybrid magnetic bearing refers to the combined structure of the first permanent magnetic ring 2-1, the second permanent magnetic ring 4-1 and the second regulating coil 2-2.

[0066] Optionally, in combination with what is shown in FIG1 , the flywheel energy storage permanent magnet device may include a bearing seat 2-3, the bearing seat 2-3 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 for installing the first permanent magnet ring 2-1, the second groove is used for installing the second regulating coil 2-2, and 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 regulating 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, in combination with what is shown in FIG1 , the flywheel energy storage permanent magnet device may include a composite flywheel 4-4, which surrounds and is fixedly connected to an 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 by interference fit.

[0071] Optionally, in combination with what is shown in FIG1 , 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 for bearing support at 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, as shown in Figure 1, 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 surround 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 and connected 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-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached 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 regulating coil, wherein the first regulating coil is used to change the magnetic flux of the memory permanent magnet in a power-on state; An outer rotor, which is disposed around the inner stator and is rotatably connected to the rotating shaft mechanism so that the outer rotor can rotate around the axis of the rotating shaft mechanism; The first permanent magnet ring; The second permanent magnetic ring; 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 in the power-on state so that the outer rotor remains suspended relative to the inner stator.

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 each of the sliced ​​iron cores is 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 comprises 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 ​​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 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.

7. The flywheel energy storage permanent magnet device according to claim 6, 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.

8. The flywheel energy storage permanent magnet device according to claim 1, characterized in that: In 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.

9. The flywheel energy storage permanent magnet device according to claim 8, characterized in that: 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, 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.

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

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