Shaftless hybrid magnetic suspension flywheel energy storage system based on surrounding type 8-shaped coil

Abstract

The invention discloses a shaftless hybrid magnetic suspension flywheel energy storage system based on a surrounding type 8-shaped coil, relates to the field of flywheel energy storage, and solves the problems that a traditional system is large in loss and poor in suspension stability. The device comprises a hybrid magnetic levitation device, a surrounding type 8-shaped coil, a vacuum chamber, a shaftless flywheel rotor, an axial magnetic flux motor stator, a motor controller, a rectifying and filtering device and the like. The hybrid magnetic levitation device is arranged at the bottom of the box body, the 8-shaped coil is arranged in the vacuum chamber, and the permanent magnet is arranged on the side face of the flywheel rotor. During energy storage, the stator of the axial flux motor generates a traveling wave magnetic field to drive the flywheel rotor to rotate, the hybrid magnetic suspension device suspends in the low-speed stage, and after the rotating speed reaches a set threshold value, the permanent magnet on the side face of the rotor and the 8-shaped coil are electromagnetically coupled to achieve stable suspension and automatic guiding. During energy supply, flywheel kinetic energy is converted into electric energy through a motor stator and output after being processed. The shaftless structure and the hybrid magnetic levitation 8-shaped coil cooperate, loss is reduced, stability and efficiency are improved, and the hybrid magnetic levitation 8-shaped coil is used for scenes of new energy storage, emergency power supply and the like.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage, and in particular to a shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil. Background Technology

[0002] With the rapid development of the green and low-carbon new energy industry, energy storage technology faces greater demand and challenges. Among these, flywheel energy storage complements other technologies in the energy storage field due to its unique physical characteristics. Flywheel energy storage is a physical energy storage technology based on kinetic energy storage, which converts electrical energy into mechanical energy for storage through a high-speed rotating flywheel. During charging, an electric motor drives the flywheel to accelerate to tens of thousands of revolutions per minute; during discharging, the flywheel decelerates, and a generator converts the mechanical energy back into electrical energy. Its core advantages lie in high power density, fast response, and near-infinite cycle life, making it particularly suitable for fields such as grid frequency regulation, industrial UPS, and new energy smoothing.

[0003] However, in practical applications, flywheel rotors may experience deviation or unstable rotation when rotating at high speeds. In addition, the use of traditional bearings for support will result in some friction, which reduces energy conversion efficiency. Summary of the Invention

[0004] The purpose of this invention is to utilize the levitation and guiding force generated by the figure-eight coil to enable the flywheel to operate in a controllable and stable manner, greatly improving the instability and deviation of rotation. At the same time, the shaftless design improves the energy conversion efficiency of the magnetic levitation flywheel energy storage system.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A shaftless hybrid magnetic levitation flywheel energy storage system based on a ring-shaped figure-eight coil includes: a hybrid magnetic levitation device, a ring-arranged figure-eight coil, a vacuum chamber, a flywheel rotor, an axial flux motor stator, a motor controller, a rectifier and filter device, etc. Initially, a stable and controllable levitation force is provided to the flywheel rotor through a bottom-mounted hybrid magnetic levitation device, allowing the flywheel rotor to float stably in the vacuum chamber above the hybrid magnetic levitation device. The stator of the axial flux motor is energized via a motor controller. The interaction between the permanent magnets on the front of the flywheel rotor and the magnetic field generated by the axial flux motor stator causes the flywheel rotor to rotate at high speed. At this time, the figure-eight coil cuts the magnetic field lines on the side of the flywheel rotor, generating an induced current. Due to the inconsistent change in magnetic flux in the upper and lower loops of the figure-eight coil, the lower loop generates a magnetic field opposite to the magnetic poles of the superconducting coil, while the upper loop generates a magnetic field with the same magnetic field as the superconducting coil. The permanent magnets as a whole are subjected to electromagnetic repulsion. When the electromagnetic force is greater than or equal to the weight of the flywheel rotor, the flywheel rotor will levitate. At this point, the power supply to the hybrid magnetic levitation device is disconnected, allowing the flywheel rotor to remain stably levitated solely by the levitation force generated by the figure-eight coil. When the flywheel deviates due to external factors, the law of magnetic induction applies: the side closer to the center generates a repulsive force, while the side farther away generates an attractive force. The flywheel rotor then experiences a net force towards the farther side, propelling it back to the center position, thus achieving automatic guidance.

[0006] During storage, power is stopped to the stator of the axial flux motor, and the flywheel rotor rotates at high speed in the vacuum chamber, storing energy in the form of mechanical energy. When the magnetic levitation flywheel energy storage system needs to output electrical energy, Faraday's law of electromagnetic induction is used to convert the kinetic energy stored in the magnetic levitation flywheel energy storage system into electrical energy through the interaction between the flywheel rotor and the stator, and output it through the rectifier and filter circuit.

[0007] The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil, as described in this invention, utilizes the characteristics of the figure-eight coil for automatic correction and efficient levitation. It balances efficiency and reliability in high-speed, high-precision scenarios. Furthermore, the flywheel rotor is placed in a vacuum chamber, significantly reducing system wear and maintenance costs. This system is simple in structure and reliable in operation, providing a solution for future flywheel energy storage.

[0008] Preferably, the hybrid magnetic levitation device can be a superconducting magnetic levitation device, which utilizes the Meissner effect of superconductors such as ReBCO high-temperature superconducting tape to generate strong levitation force and achieves position self-stabilization by means of magnetic flux pinning effect; the device does not require active control and continuous power supply in the levitation state, thus having advantages in system energy efficiency and operational stability.

[0009] Preferably, the stator winding of the axial flux motor (or the form of a PCB axial flux motor stator winding) can be a multi-turn superconducting winding, which utilizes the zero resistance characteristic of superconductors to increase the current carrying capacity of the winding and improve the motor efficiency.

[0010] Preferably, the flywheel rotor is made of carbon fiber composite material to meet the structural strength requirements of the flywheel rotor at high speed.

[0011] Preferably, the energy input can be selected from distributed new energy sources such as photovoltaic and wind power for consumption.

[0012] Preferably, the figure-eight coil is made of a material with low resistivity, such as silver, copper, or superconducting materials, thereby reducing heat generation and avoiding excessive energy loss.

[0013] Preferably, the flywheel rotor should be placed at the center of the figure-eight coil in the annular array structure to ensure that the coil can provide a large interaction force, thereby meeting the requirement of high-speed rotation of the flywheel rotor.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil, as described in this invention, utilizes the characteristics of the figure-eight coil for automatic correction and efficient levitation. It balances efficiency and reliability in high-speed, high-precision scenarios. Furthermore, the flywheel rotor is placed in a vacuum chamber, significantly reducing system wear and maintenance costs. This system is simple in structure and reliable in operation, providing a solution for future flywheel energy storage. Attached Figure Description

[0015] The foregoing and hereinafter detailed description of the present invention will become clearer when read in conjunction with the following accompanying drawings, which are as follows: Figure 1 This is a schematic diagram of the structure of a shaftless hybrid magnetic levitation flywheel energy storage system based on a surrounding figure-eight coil, as described in this invention. Figure 2 This is a cross-sectional view of the vacuum chamber of a shaftless hybrid magnetic levitation flywheel energy storage system based on a wrapped figure-eight coil, as described in this invention. Figure 3 This is a schematic diagram of the flywheel rotor structure of a shaftless hybrid magnetic levitation flywheel energy storage system based on a surrounding figure-eight coil, as described in this invention. Figure 4 This is a schematic diagram of the surrounding figure-eight coil structure of a shaftless hybrid magnetic levitation flywheel energy storage system based on a surrounding figure-eight coil, as described in this invention. Figure 5 This is a schematic diagram of the stator structure of an axial flux motor for a shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil, as described in this invention. The diagram is labeled as follows: 1-Hybrid maglev device, 2-Vacuum chamber, 3-Motor controller, 4-Rectifier and filter device, 5-Crossbeam, 6-Screw, 7-Box, 21-Support, 22-Hybrid maglev device, 23-Flywheel rotor, 24-Wrapped figure-eight coil, 25-Bracket, 26-Sealing cover, 27-Motor stator, 231-Permanent magnet, 241-Figure-eight coil, 272-Coil winding, etc. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0017] Example: Figure 1 As shown and Figure 2 As shown, the present invention discloses a shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil, comprising: a hybrid magnetic levitation device 1, a vacuum chamber 2, a motor controller 3, a rectifier and filter device 4, a crossbeam 5, a screw 6, and a housing 7. The hybrid magnetic levitation device 1 is placed at the bottom of the housing 7 to provide the necessary levitation force for the flywheel rotor 23, enabling the flywheel rotor 23 to float stably in the vacuum chamber 2. The axial flux motor stator 27 is fixed at an appropriate gap above the flywheel rotor 23, utilizing the permanent magnet on the front of the flywheel rotor 23 and the energized axial flux motor stator... The interaction of the traveling wave magnetic field generated by 27 allows the flywheel rotor 23 to rotate at high speed. A permanent magnet 231 is embedded in the side of the flywheel rotor 23. The figure-eight coil cuts its magnetic field lines and generates an induced current. Due to the inconsistent change in magnetic flux in the upper and lower loops of the figure-eight coil, the permanent magnet as a whole is subjected to electromagnetic repulsion. When the electromagnetic force is greater than or equal to the weight of the flywheel rotor 23, the flywheel rotor 23 will levitate. When the flywheel rotor 23 deviates, the law of magnetic induction is used to generate a repulsive force on the side that is closer and an attractive force on the side that is farther away, so that the flywheel rotor 23 returns to the center position.

[0018] like Figure 2 As shown, a support 21 is provided at the bottom of the vacuum chamber to support the flywheel rotor 23 when not in operation; a figure-eight coil 24 is arranged around the flywheel rotor 23; the axial flux motor stator 27 is placed directly above the flywheel rotor 23 and is supported by a bracket 25 to ensure its stability, and the distance between the stator and the rotor can be adjusted by the bracket; a sealing cover 26 ensures the airtightness of the vacuum chamber; the rotating magnetic field generated by the energized axial flux motor stator 27 interacts with the permanent magnet 231 on the front of the flywheel rotor 23 to make the flywheel rotor 23 rotate at high speed; a circular hole is opened at the top of the vacuum chamber 2 to connect the input and output circuits, and a sealing treatment is performed to ensure the airtightness of the vacuum chamber.

[0019] like Figure 3As shown, the flywheel rotor body is made of carbon fiber composite material to meet the structural strength requirements of the flywheel rotor 23 at high speed. Permanent magnets 231 are embedded on its front and sides and are arranged in an alternating manner. At the same time, a hybrid magnetic levitation device is integrated at the bottom to ensure that the flywheel rotor can be stably suspended.

[0020] like Figure 4 As shown, the symmetrical figure-eight coils 24 are arranged in a ring structure, and the opposite figure-eight coils are connected by wires to form a closed current loop. At the same time, the flywheel rotor 23 is placed at the center of the ring-arranged figure-eight coils to ensure effective use of the characteristics of the figure-eight coils, so that the flywheel rotor 23 can be stably suspended while achieving automatic correction.

[0021] like Figure 5 As shown, the stator 27 of the axial flux motor has 12 coil windings 271 evenly distributed on the front side, which are connected together through the center point to form a star three-phase connection. When storing energy, the stator 27 of the axial flux motor is energized to drive the flywheel rotor 23 to run at high speed. When energy output is required, the stored kinetic energy is converted into electrical energy output by using Faraday's law of electromagnetic induction.

[0022] When the alternating current of the axial flux motor stator is disconnected during storage, the flywheel rotor 23 rotates at high speed in the vacuum chamber 2, and the energy is stored in the form of mechanical energy. When the magnetic levitation flywheel energy storage system needs to output electrical energy, the flywheel rotor 23 and the axial flux motor stator 27 interact to convert the kinetic energy stored in the magnetic levitation flywheel energy storage system into electrical energy, which is then output through the rectifier and filter circuit connected to the axial flux motor stator 27.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A shaftless hybrid magnetic levitation flywheel energy storage system based on a spiral figure-eight coil, characterized in that, include: Hybrid maglev device (1), vacuum chamber (2), motor controller (3), rectifier and filter device (4), crossbeam (5), screw (6), housing (7), etc.; Hybrid maglev device (1) is located at the bottom of the whole system, providing the necessary levitation force. Vacuum chamber (2) is connected to the top crossbeam (5) through screw (6) and fixed to an appropriate gap above hybrid maglev device (1). The wraparound figure-eight coil is arranged in vacuum chamber (2). Flywheel rotor and axial flux motor stator are placed in the vacuum chamber at the center of wraparound figure-eight coil, and axial flux motor stator is fixed to an appropriate gap above flywheel rotor. Motor controller (2) and rectifier and filter device (4) realize bidirectional energy conversion.

2. The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil according to claim 1, characterized in that, The flywheel rotor body is made of carbon fiber composite material; its side and top surfaces are inlaid with several permanent magnets, and the entire rotor is covered with a layer of carbon fiber composite material.

3. The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil according to claim 1, characterized in that, The stator of the axial flux motor is formed by stamping and stacking silicon steel sheets. Multiple sets of coils are embedded on its surface facing the air gap. The ends of each set of coils converge at a point to form a star-shaped electrical connection.

4. The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil according to claim 1, characterized in that, The system includes a ring-shaped figure-eight coil array, which consists of multiple figure-eight coil units made of a high-conductivity conductive material.

5. The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil according to claim 1, characterized in that, The magnetic levitation method of the hybrid magnetic levitation device (1) installed at the bottom includes, but is not limited to, any one or any combination of superconducting magnetic levitation, electromagnetic levitation, permanent magnet levitation, etc.

6. The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil according to claim 1, characterized in that, To achieve stable placement and precise relative position control of the vacuum chamber (2) above the hybrid magnetic levitation device (1), an adjustable support structure is designed. The core of this structure includes: a load-bearing crossbeam (5) installed on the top of the box, a docking flange fixed to the vacuum chamber, and several screws (6) connecting the two. By rotating the screws (6), the vertical height of the vacuum chamber can be precisely controlled, thereby ensuring that the working gap between it and the hybrid magnetic levitation device below meets the design requirements.

7. The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil according to claim 1, characterized in that, The circularly arranged figure-eight coil array and the permanent magnet embedded on the side of the flywheel rotor together constitute the levitation force generating unit. When the flywheel rotor rotates, the figure-eight coil cuts the magnetic field lines of the permanent magnet to generate an induced current. This current then forms a magnetic flux difference in the upper and lower loops of the coil, thereby generating a net electromagnetic repulsion force in the permanent magnet pointing upward. When the flywheel rotor reaches a specific speed, the net electromagnetic repulsion force is at least balanced with the gravity of the flywheel rotor, thereby achieving its non-contact stable levitation.

8. The shaftless hybrid magnetic levitation flywheel energy storage system based on a wraparound figure-eight coil according to claim 1, characterized in that, The circularly arranged figure-eight coil array and the permanent magnet on the side of the flywheel rotor form a radial self-stabilizing structure. In equilibrium, the flywheel rotor rotates in the center with equal spacing between it and the coils on the left and right sides, and the resultant lateral force it experiences is zero. When the flywheel rotor deviates radially from the center position, the spacing between it and the coils on both sides changes, causing a change in the electromagnetic force exerted by the coils on both sides on the permanent magnet, thereby generating a resultant force that pushes the flywheel rotor back to the center position, achieving automatic correction and stabilization during operation.

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