High-integration flywheel energy storage system based on strong magnetic stator permanent magnet type axial flux motor

Abstract

The application discloses a high-integration flywheel energy storage system based on a strong magnetic stator permanent magnet type axial flux motor, and relates to the field of flywheel energy storage systems.The system comprises a strong magnetic stator permanent magnet type axial flux flywheel motor, a high-integration hybrid magnetic suspension bearing and an integrated flywheel rotor, etc.The strong magnetic stator permanent magnet type axial flux flywheel motor comprises a stator and a rotor, and the stator is internally provided with a spiral cooling water channel.The high-integration hybrid magnetic suspension bearing comprises a radial magnetic suspension bearing and an axial magnetic suspension shaft, and is divided into a rotating part and a stationary part.The stationary part is integrated with the stator of the strong magnetic stator permanent magnet type axial flux flywheel motor, the rotating part is embedded in the flywheel rotor together with the rotor of the strong magnetic stator permanent magnet type axial flux flywheel motor, and the flywheel rotor is composed of the rotating part and the stationary part.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of flywheel energy storage systems, in particular to a high-integration flywheel energy storage system based on a strong magnetic stator permanent magnet type axial flux motor. BACKGROUND

[0002] With the rapid growth of the number of automobiles, energy shortage and environmental pollution problems are increasingly prominent, and energy saving and emission reduction has become an important demand in the current automobile field. As one of the effective means to reduce environmental pollution and save oil resources, electric vehicles have been regarded as an important way to solve the energy crisis and promote the sustainable development of the automobile industry. However, the endurance problem restricts the further development of electric vehicles, and the flywheel energy storage system breaks through the limitations of chemical batteries, has the advantages of no pollution, high energy conversion efficiency and power density, long cycle life and the like, and can effectively improve the endurance of electric vehicles when applied to the regenerative braking system of electric vehicles. It is an important way to help China achieve the goal of low carbon and energy transformation.

[0003] However, due to the limitation of the internal space of electric vehicles and the demand of the whole vehicle for the energy density and weight of the flywheel energy storage system, the flywheel energy storage for electric vehicles requires compact structure and high energy density index. As the core component of the flywheel energy storage system, the performance of the high-speed flywheel motor directly affects the advantages and disadvantages of the flywheel energy storage system. The axial flux motor has the advantages of compact axial size, high efficiency and large power density, and has broad application prospects in the flywheel energy storage system of electric vehicles.

[0004] However, the permanent magnet of the traditional axial flux motor is installed on the rotor, and when the motor is heated, the rotor is difficult to cool, and faults such as demagnetization of the permanent magnet are prone to occur. Therefore, there are still many problems to be solved in the flywheel energy storage system for electric vehicles at present, which to some extent limits its engineering application. SUMMARY

[0005] The application is to solve the problems that the permanent magnet of the axial flux motor is installed on the rotor in the prior art, the rotor is difficult to cool when the motor is heated, and faults such as demagnetization of the permanent magnet are prone to occur, and the high stability, high integration and high energy density operation requirements of the flywheel energy storage system for electric vehicles. To solve the above technical problems, the application is realized by the following technical scheme:

[0006] Scheme one, the application provides a high-integration flywheel energy storage system based on a strong magnetic stator permanent magnet type axial flux motor, the high-integration flywheel energy storage system comprises a strong magnetic stator permanent magnet type axial flux flywheel motor, a high-integration hybrid magnetic suspension bearing and an integrated flywheel rotor.

[0007] The strong magnetic stator permanent magnet type axial flux flywheel motor comprises two stators and a rotor, and the stator is internally provided with a spiral cooling water channel.

[0008] The high-integration mixed magnetic suspension bearing comprises a radial magnetic suspension bearing and an axial magnetic suspension bearing, and is divided into a rotating part and a static part; the static part is integrated with a stator of a strong magnetic gathering type stator permanent magnet axial flux flywheel motor; the rotating part is integrated with a rotor of the strong magnetic gathering type stator permanent magnet axial flux flywheel motor, and the rotating part and the static part jointly form an integrated flywheel rotor.

[0009] Further, a preferred embodiment is provided, wherein the stator comprises a winding, an excitation permanent magnet, a magnet-enhancing permanent magnet, a stator core and a cooling water channel, and the excitation permanent magnet and the magnet-enhancing permanent magnet transfer heat in the cooling water channel through the stator core.

[0010] Further, a preferred embodiment is provided, wherein the excitation permanent magnet is embedded in a stator tooth of the stator core.

[0011] Further, a preferred embodiment is provided, wherein the magnet-enhancing permanent magnet is attached to a stator tooth pole shoe of the stator core.

[0012] Further, a preferred embodiment is provided, wherein the magnetization directions of two adjacent excitation permanent magnets are opposite to each other.

[0013] Further, a preferred embodiment is provided, wherein the magnetization directions of two adjacent magnet-enhancing permanent magnets are opposite to each other.

[0014] Further, a preferred embodiment is provided, wherein the magnet-enhancing permanent magnet generates a magnetic field in the same direction as that generated by the excitation permanent magnet at a gap.

[0015] Further, a preferred embodiment is provided, wherein a spiral cooling water channel is arranged in the stator core of the stator.

[0016] Further, a preferred embodiment is provided, wherein a non-magnetic and non-conductive cooling liquid is filled in the cooling water channel.

[0017] Further, a preferred embodiment is provided, wherein the rotor is free of permanent magnets and windings.

[0018] The present application has the following advantages:

[0019] The strong magnetic gathering type stator permanent magnet axial flux flywheel motor rotor of the high-integration flywheel energy storage system based on the strong magnetic gathering type stator permanent magnet axial flux motor is free of permanent magnets and windings, which increases the heat resistance of the motor while ensuring the mechanical strength.

[0020] The strong magnetic type stator permanent magnet type axial flux flywheel motor described in the application is equipped with spiral water channels in the stator part, improves the heat dissipation capacity of the system, and solves the problem of excessive temperature rise caused by the concentration of heat sources in the stator part and the difficulty of heat dissipation in the vacuum operation environment.

[0021] The strong magnetic type stator permanent magnet type axial flux flywheel motor described in the application is equipped with magnetic enhancement permanent magnets at the stator tooth pole shoe, enhances the magnetic aggregation effect, and improves the air gap magnetic flux density and power density of the motor.

[0022] The mixed magnetic suspension bearing described in the application integrates the radial magnetic suspension bearing and the axial magnetic suspension bearing, reduces the volume of the magnetic suspension bearing, and improves the integration degree.

[0023] The stator part of the mixed magnetic suspension bearing described in the application is integrated with the strong magnetic type stator permanent magnet type axial flux flywheel motor stator part, improving the system integration degree.

[0024] The rotating part of the mixed magnetic suspension bearing described in the application is integrated with the strong magnetic type stator permanent magnet type axial flux flywheel motor rotor part and the high-speed flywheel rotor, improving the system integration degree and increasing the space utilization rate.

[0025] The application is also suitable for the field of flywheel energy storage systems for electric vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The three-dimensional structure split schematic diagram of the high-integration flywheel energy storage system based on the strong magnetic type stator permanent magnet type axial flux motor according to the first embodiment.

[0027] Figure 2 The three-dimensional structure schematic diagram of the strong magnetic type stator permanent magnet type axial flux flywheel motor according to the first embodiment.

[0028] Figure 3 The stator structure schematic diagram of the strong magnetic type stator permanent magnet type axial flux flywheel motor according to the first embodiment.

[0029] Figure 4 The magnetization method schematic diagram according to the eleventh embodiment.

[0030] Figure 5 The magnetic enhancement principle schematic diagram according to the eleventh embodiment.

[0031] Figure 5 In the figure, (a) is a magnetic force line trend diagram of the excitation permanent magnet, and (b) is a magnetic force line trend diagram of the magnetic enhancement permanent magnet.

[0032] Figure 6 The cooling water channel schematic diagram of the strong magnetic type stator permanent magnet type axial flux flywheel motor according to the eleventh embodiment.

[0033] Figure 7 This is a schematic diagram of the highly integrated hybrid magnetic levitation bearing structure described in Embodiment Eleven.

[0034] Figure 8 This is a schematic diagram showing the integration of the stationary part of the hybrid magnetic levitation bearing and the stator part of the strong magnetically concentrated stator permanent magnet axial flux flywheel motor as described in Embodiment Eleven.

[0035] Figure 9 This is a schematic diagram of the integrated flywheel rotor structure described in Embodiment Eleven.

[0036] In the figure, there is a high-intensity magnetic stator permanent magnet axial flux flywheel motor 1, a highly integrated hybrid magnetic levitation bearing 2, an integrated flywheel rotor 3, a vacuum chamber 4, a protective bearing 5, a stator 11, a rotor 12, a winding 111, an excitation permanent magnet 112, a magnetizing permanent magnet 113, an iron core 114, a cooling water channel 115, a radial magnetic levitation bearing 21, an axial magnetic levitation bearing 22, a stationary part 23, and a rotating part 24. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0038] Implementation Method 1: This implementation method provides a highly integrated flywheel energy storage system based on a strong magnetic field stator permanent magnet axial flux motor. The highly integrated flywheel energy storage system includes a strong magnetic field stator permanent magnet axial flux flywheel motor 1, a highly integrated hybrid magnetic levitation bearing 2, and an integrated flywheel rotor 3.

[0039] The strong magnetic field type stator permanent magnet axial flux flywheel motor 1 includes two stators 11 and one rotor 12. The stators 11 are provided with a spiral cooling water channel 115.

[0040] The highly integrated hybrid magnetic levitation bearing 2 includes a radial magnetic levitation bearing 21 and an axial magnetic levitation shaft 22, and is divided into a rotating part 23 and a stationary part 24. The stationary part 24 is integrated with the stator 11 of the strong magnetic condensation stator permanent magnet axial flux flywheel motor, and the rotating part 23 is integrated with the rotor 12 of the strong magnetic condensation stator permanent magnet axial flux flywheel motor 1, and together they form an integrated flywheel rotor 3.

[0041] Embodiment two, the embodiment is described in the first embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit the stator 11 includes winding 111, excitation permanent magnet 112, magnetic permanent magnet 113, stator core 114 and cooling water channel 115, the excitation permanent magnet 112 and magnetic permanent magnet 113 pass through the stator core 114 and transfer the heat in the cooling water channel 115.

[0042] Embodiment three, the embodiment is described in the second embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit, the excitation permanent magnet 112 is embedded in the stator tooth of the core 114.

[0043] Embodiment four, the embodiment is described in the second embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit, magnetic permanent magnet 113 is pasted at the stator tooth pole shoe of core 114.

[0044] Embodiment five, the embodiment is described in the second embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit, the magnetization mode of two adjacent excitation permanent magnets 112 is the tangential magnetization mode with opposite magnetization directions.

[0045] Embodiment six, the embodiment is described in the second embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit, the magnetization mode of two adjacent magnetic permanent magnets 113 is the radial magnetization mode with opposite magnetization directions.

[0046] Embodiment seven, the embodiment is described in the third or fourth embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit, the magnetic field direction generated by the magnetic permanent magnet 113 is the same as the magnetic field direction generated by the excitation permanent magnet 112 at the air gap.

[0047] Embodiment eight, the embodiment is described in the second embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit, the spiral cooling water channel 115 is arranged in the stator core 114 inside the stator 11.

[0048] Embodiment nine, the embodiment is described in the eighth embodiment of the high integration flywheel energy storage system based on strong magnetic type stator permanent magnet axial flux motor further limit, the spiral cooling water channel 115 is arranged in the stator core 114 inside the stator 11.

[0049] Embodiment ten, this embodiment is a further limitation of the high-integration flywheel energy storage system based on the strong magnetic type stator permanent magnet axial flux motor of embodiment one, the rotor 12 has no permanent magnet and no winding.

[0050] Embodiment eleven, this embodiment proposes an example for explaining embodiments one to eight, which is specifically:

[0051] Referring to Figures 1 to 9 This embodiment explains that the application proposes a new topology of high-integration flywheel energy storage system based on the strong magnetic type stator permanent magnet axial flux motor, mainly including a strong magnetic type stator permanent magnet axial flux flywheel motor, a high-integration hybrid magnetic suspension bearing, an integrated flywheel rotor, a protection bearing and a vacuum chamber. The strong magnetic type stator permanent magnet axial flux flywheel motor is composed of two stators and a rotor, and the inside of the stator is equipped with a spiral water channel. The high-integration hybrid magnetic suspension bearing is composed of a radial magnetic suspension bearing and an axial magnetic suspension shaft, mainly including a stationary part and a rotating part. The stationary part is integrated with the stator part of the strong magnetic type stator permanent magnet axial flux flywheel motor, and the rotating part is integrated with the rotor part of the strong magnetic type stator permanent magnet axial flux flywheel motor and the high-speed flywheel rotor, together forming an integrated flywheel rotor structure.

[0052] By introducing the magnet-enhanced permanent magnet, the magnetic effect is enhanced, the air gap magnetic flux density and power density of the system are improved. And it is deeply integrated with the high-integration hybrid magnetic suspension bearing and the integrated flywheel rotor, improves the energy density of the system, and increases the space utilization. By equipping the spiral cooling water channel 115 in the core 114 of the strong magnetic type stator permanent magnet axial flux flywheel motor 1, the heat dissipation performance of the system is improved, the system is prevented from overheating, and the safe and reliable operation of the system is ensured.

[0053] Referring to Figure 1 As shown in the figure, the high-integration flywheel energy storage system based on the strong magnetic type stator permanent magnet axial flux motor in the application includes a strong magnetic type stator permanent magnet axial flux flywheel motor 1, a high-integration hybrid magnetic suspension bearing 2, an integrated flywheel rotor 3, a protection bearing 4 and a vacuum chamber 5.

[0054] Referring to Figures 2 to 6As shown, the strong magnetic type stator permanent magnet axial flux flywheel motor 1 in the application is composed of two stators 11 and a rotor 12. The stator 11 mainly comprises a winding 111, an excitation permanent magnet 112, a magnetic enhancement permanent magnet 113, an iron core 114 and a cooling water channel 115. The excitation permanent magnet 112 is embedded in the stator tooth of the iron core 114, and the magnetic enhancement permanent magnet is attached to the stator tooth pole of the iron core 114. The two adjacent excitation permanent magnets 112 adopt the tangential magnetization method with opposite magnetization directions, and the two adjacent magnetic enhancement permanent magnets 113 adopt the radial magnetization method with opposite magnetization directions. The excitation permanent magnet 112 and the magnetic enhancement permanent magnet 113 are used in cooperation, so that the magnetic field direction generated by the magnetic enhancement permanent magnet 113 is the same as the magnetic field direction generated by the excitation permanent magnet 112 at the air gap, the magnetic fields of the two are superposed, and the air gap magnetic field is increased, so that the power density of the motor can be effectively improved. The cooling water channel 115 is embedded in the stator iron core 114, and the non-magnetic and non-conductive cooling liquid is introduced into the inside. The heat generated by the stator iron core 114, the winding 111, the excitation permanent magnet 112 and the magnetic enhancement permanent magnet 113 is directly transmitted to the cooling water channel 115 through the circulation of the cooling liquid in the cooling water channel 115, so as to achieve the purpose of cooling, and effectively solve the problem of high temperature rise of the system caused by the concentrated heat source of the strong magnetic type stator permanent magnet axial flux flywheel motor and the difficulty of heat dissipation in the vacuum environment. The rotor 12 has no permanent magnet and winding, which effectively improves the mechanical strength of the motor and ensures the safe and stable operation of the motor.

[0055] Reference Figures 7 to 9 As shown, the high-integration mixed magnetic suspension bearing 2 is composed of a radial magnetic suspension bearing 21 and an axial magnetic suspension bearing 22, which can be divided into a rotating part 23 and a stationary part 24. The stationary part 24 is integrated with the stator part 11 of the strong magnetic type stator permanent magnet axial flux flywheel motor, and the rotating part 23 is embedded in the flywheel rotor with the rotor 12 of the strong magnetic type stator permanent magnet axial flux flywheel motor, and forms an integrated flywheel rotor structure with the flywheel rotor. The embedded part of the magnetic bearing not only can provide energy as part of the flywheel, but also can provide bearing capacity as part of the magnetic bearing. Therefore, the volume of the system is reduced, and the integration of the system is improved.

[0056] Those skilled in the art can understand that the above description is only a preferred embodiment of the present application, and the features described in each embodiment and / or claim of the present disclosure can be combined or combined, even if such combination or combination is not explicitly described in the present disclosure. It is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacement of part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0057] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the foregoing description. It is therefore intended that the appended claims shall cover all such modifications and changes as fall within the true spirit and scope of the application. It is further understood that the application can be used in a variety of applications and that the application is not limited to the applications described above. Accordingly, many modifications and variations of the application are possible in light of the above teachings without departing from the spirit and scope of the application. It is therefore intended that the application be covered all such modifications and variations provided they come within the scope of the claims and their equivalents.

Claims

1. A high-integration flywheel energy storage system based on strong magnetic stator permanent magnet type axial flux motor, characterized in that, The high-integration flywheel energy storage system comprises a strong magnetic gathering stator permanent magnet type axial flux flywheel motor (1), a high-integration hybrid magnetic suspension bearing (2) and an integrated flywheel rotor (3). The strong magnetic gathering stator permanent magnet type axial flux flywheel motor (1) comprises two stators (11) and a rotor (12), and the stator (11) is internally provided with a spiral cooling water channel (115). The high-integration hybrid magnetic suspension bearing (2) comprises a radial magnetic suspension bearing (21) and an axial magnetic suspension bearing (22), and is divided into a rotating part (23) and a stationary part (24), the stationary part (24) is integrated with the stator (11) of the strong magnetic gathering stator permanent magnet type axial flux flywheel motor, the rotating part (23) is integrated with the rotor (12) of the strong magnetic gathering stator permanent magnet type axial flux flywheel motor (1), and the rotating part (23) and the stationary part (24) together constitute the integrated flywheel rotor (3).

2. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 1, wherein, The stator (11) comprises a winding (111), an excitation permanent magnet (112), a magnetic enhancement permanent magnet (113), a stator core (114) and a spiral cooling water channel (115), the excitation permanent magnet (112) and the magnetic enhancement permanent magnet (113) transfer heat in the spiral cooling water channel (115) through the stator core (114).

3. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 2, wherein, The excitation permanent magnet (112) is embedded in the stator teeth of the core (114).

4. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 2, wherein, The magnetic enhancement permanent magnet (113) is attached to the stator tooth pole shoe of the core (114).

5. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 2, wherein, The magnetization modes of the two adjacent excitation permanent magnets (112) are tangential magnetization modes with opposite magnetization directions.

6. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 2, wherein, The magnetization modes of the two adjacent magnetic enhancement permanent magnets (113) are radial magnetization modes with opposite magnetization directions.

7. The highly integrated flywheel energy storage system based on a strong-focusing stator permanent magnet axial flux motor according to claim 3 or 4, characterized in that, The magnetic field direction generated by the magnetic enhancement permanent magnet (113) is the same as the magnetic field direction generated by the excitation permanent magnet (112) at the air gap.

8. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 2, wherein, The spiral cooling water channel (115) is arranged in the stator core (114) of the stator (11).

9. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 8, wherein, The spiral cooling water channel (115) is internally connected with non-magnetic and non-conductive cooling liquid.

10. The high-integration flywheel energy storage system based on the high- aggregation magnetic stator permanent-magnet type axial flux motor of claim 1, wherein, The rotor (12) is internally provided with no permanent magnet and no winding.

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