Flywheel energy storage motor with electrically charged eddy current braking system

Abstract

The utility model relates to the technical field of flywheel energy storage motor, concretely relates to a flywheel energy storage motor with electric eddy current braking system, including support casing, flywheel rotor and electric eddy current braking mechanism, electric eddy current braking mechanism includes stator ring and a plurality of winding coils, stator ring is with support casing interference fit, stator ring is set up around flywheel rotor, annular air gap is formed between stator ring and flywheel rotor, a plurality of winding coils are set up on stator ring. Can realize the quick safe braking of flywheel rotor after winding coil is passed in direct current, satisfy the requirement that flywheel rotor is braked to safe shutdown in extremely short time, at the same time, convenient and fast installation, no other additional connecting piece, can be adapted to carry out quick assembly application on small size flywheel energy storage motor, can realize the linear regulation of braking torque through the change of excitation current, make the braking process can be graded, accurate control according to rotational speed, no mechanical wear and tear and impact vibration in the braking process, can realize the stable braking process.

Description

Technical Field

[0001] This utility model relates to the field of flywheel energy storage motor technology, specifically to a flywheel energy storage motor with an electric eddy current braking system. Background Technology

[0002] Flywheel energy storage motors need to operate at rated speed throughout their entire lifespan. Since the energy storage capacity is proportional to the square of the rotational speed, increasing the rotational speed can significantly improve the energy storage density. Therefore, flywheel energy storage motors are developing towards higher speeds. Under high-speed, high-energy operating conditions, if any of the systems such as the bearing system, motor control system, temperature, or vacuum malfunctions or other emergencies occur, the flywheel rotor needs to be safely and smoothly braked from the rated speed to a safe speed and then stopped within a very short time. The timeliness, reliability, stability, and safety of the braking system are crucial safety guarantees for the operation of flywheel energy storage motors.

[0003] Existing flywheel energy storage motor braking mainly uses electromagnetic braking. Its working principle is as follows: when braking is required, the flywheel motor is switched to generator mode by the control system and frequency converter, taking advantage of the flywheel motor's reversibility. The flywheel motor generates braking torque through reverse excitation, and the flywheel decelerates and releases kinetic energy, which is converted into electrical energy of the flywheel motor through electromagnetic induction, i.e., the discharge process. The electrical energy is consumed as heat energy through the braking resistor equipped in the flywheel system, realizing the braking function of the flywheel rotor. However, the entire braking time from rated speed to stop is relatively long for electromagnetic braking, which cannot meet the requirements of emergency braking of the flywheel rotor to safe stop. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing flywheel energy storage motors, which have long braking times and cannot bring the flywheel rotor to a safe stop under emergency braking, and to provide a flywheel energy storage motor with an eddy current braking system.

[0005] This utility model provides a flywheel energy storage motor with an eddy current braking system, including a support housing, a flywheel rotor, and an eddy current braking mechanism. The eddy current braking mechanism includes a stator ring and a plurality of winding coils. The stator ring is interference-fitted with the support housing and is arranged around the flywheel rotor. An annular air gap is formed between the stator ring and the flywheel rotor. A plurality of winding coils are arranged on the stator ring.

[0006] Preferably, the flywheel rotor includes a brake disc and a flywheel disc arranged coaxially, the brake disc and the flywheel disc being spaced apart along the axial direction, and the stator ring being correspondingly arranged around the brake disc.

[0007] Preferably, a conductive layer is provided on the outer wall of the brake disc.

[0008] Preferably, a plurality of grooves are distributed on the stator ring, the grooves penetrating both ends of the stator ring along its axial direction and the inner wall, and the winding coils are disposed within the grooves.

[0009] Preferably, a plurality of the slots are evenly distributed around the axis of the stator ring, and a protrusion is formed between adjacent slots, with the winding coils arranged around the protrusions.

[0010] Preferably, the groove partially penetrates the inner wall of the stator ring, forming an edge on the side of the protrusion near the axis.

[0011] Preferably, the flywheel rotor includes a central shaft, and the brake disc and / or the flywheel disc and the central shaft are integral structural components.

[0012] Preferably, a disc motor is coaxially mounted on the side of the brake disc away from the flywheel disc.

[0013] Preferably, the support housing includes an outer shell, an upper cover plate, and a lower cover plate. The upper cover plate and the lower cover plate are positioned and detachably connected. The upper cover plate and the lower cover plate are embedded with bearings that cooperate with the central shaft. The stator ring is interference-fitted with the outer shell.

[0014] Preferably, the flywheel disk and the outer casing are in clearance fit.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model provides a flywheel energy storage motor with an eddy current braking system. By embedding an eddy current braking mechanism in the support housing, an annular air gap is formed between the stator ring and the flywheel rotor, achieving uniform air gap space. After DC current is applied to the winding coil, the flywheel rotor can achieve rapid and safe braking, which can meet the requirement of the flywheel rotor to stop safely in an emergency within a very short time. 2. This utility model provides a flywheel energy storage motor with an eddy current braking system. By interfering with the eddy current braking mechanism and the support housing, the installation is convenient and quick, without any other additional connecting parts, and it can be adapted to rapid assembly applications on small-sized flywheel energy storage motors. 3. This utility model provides a flywheel energy storage motor with an eddy current braking system. By changing the excitation current, the braking torque can be linearly adjusted, so that the braking process can be graded and precisely controlled according to the speed. 4. This utility model provides a flywheel energy storage motor with an electric eddy current braking system. During the braking process, there is no mechanical wear or impact vibration, which can achieve a smooth flying wheel rotor braking process and a long service life. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of a flywheel energy storage motor for an eddy current braking system according to Example 1.

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of section AA in the middle.

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the BB cross section.

[0019] Figure 4 for Figure 3 A schematic diagram of the structure of the CC section.

[0020] Figure 5 This is a schematic diagram of the eddy current braking mechanism described in Example 1.

[0021] Figure 6 This is a schematic diagram of the flywheel rotor described in Example 1.

[0022] Marked in the image: 1-Supporting shell, 11-Outer shell, 12-Upper cover plate, 13-Lower cover plate 2-Flywheel rotor, 21-Brake disc, 22-Flywheel disc, 23-Conductive layer, 24-Central shaft 3-Eddy current braking mechanism, 31-Stator ring, 311-Slot, 312-Bump, 313-Edge, 32-Winding coil. 4-Air gap, 5-Disc motor, 6-Bearing. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope 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.

[0024] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0026] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0027] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0028] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0029] Example 1 like Figures 1-6As shown, a flywheel energy storage motor with an eddy current braking system includes a support housing 1, a flywheel rotor 2, and an eddy current braking mechanism 3. The eddy current braking mechanism 3 includes a stator ring 31 and a plurality of winding coils 32. The stator ring 31 is interference-fitted with the support housing 1 and is arranged around the flywheel rotor 2. An annular air gap 4 is formed between the stator ring 31 and the flywheel rotor 2. A plurality of winding coils 32 are arranged on the stator ring 31.

[0030] The support housing 1 is the housing part of the flywheel energy storage motor. The flywheel rotor 2 is rotatably installed inside the support housing 1. The eddy current braking mechanism 3 is installed between the support housing 1 and the flywheel rotor 2. The winding coil 32 is used to generate an electromagnetic field after DC current is applied. In the state of rotation of the flywheel rotor 2, it can generate a braking torque on the flywheel by generating eddy current, thereby realizing the emergency braking of the high-speed rotating flywheel rotor 2.

[0031] In one or more embodiments, the flywheel rotor 2 may include a brake disc 21 and a flywheel disc 22 coaxially arranged, with the brake disc 21 and flywheel disc 22 spaced apart along the axial direction. The stator ring 31 may be an annular structure surrounding the flywheel rotor 2, and the stator ring 31 may be correspondingly arranged around the brake disc 21. This makes the flywheel rotor 2 consist of two parts. The eddy current braking mechanism 3 can cooperate with the brake disc 21 to brake the flywheel disc 22 by applying eddy current braking to the brake disc 21.

[0032] In an optional embodiment, the flywheel rotor 2 includes a central shaft 24. The brake disc 21 and flywheel disc 22 can be integrally machined with the central shaft 24, or they can be machined independently and assembled separately. Alternatively, the brake disc 21 can be integrally machined with the central shaft 24 and the flywheel disc 22 can be assembled with it. The choice can be made according to the actual situation.

[0033] In an optional embodiment, a conductive layer 23 is provided on the outer wall of the brake disc 21. The conductive layer 23 can be a metal layer with good conductivity, such as copper or aluminum, which is superior to the conductivity of the raw material of the brake disc 21. The better the conductivity, the greater the braking torque that can be generated, and the better it can cooperate with the winding coil 32 to achieve a better braking effect.

[0034] In an optional embodiment, a plurality of slots 311 are distributed on the stator ring 31, the slots 311 penetrating both ends of the stator ring 31 axially and the inner wall, and the winding coils 32 are disposed within the slots 311. The slots 311 provide mounting positions for the winding coils 32, achieving a stable placement of the winding coils 32 on the inner wall side of the stator ring 31, making the stator ring 31 and the plurality of winding coils 32 form a whole, facilitating installation and use, and enabling the winding coils 32 to be evenly distributed around the flywheel rotor 2 through the arrangement of the slots 311.

[0035] In an optional embodiment, the number of slots 311 can be designed according to braking power, braking torque, etc., and can be an even number such as 16, 18, or 20, so as to achieve uniform distribution of slots 311 around the stator ring 31, realize uniform and effective braking torque, and realize rapid braking of the flywheel energy storage motor.

[0036] In an optional embodiment, a plurality of slots 311 are evenly distributed around the axis of the stator ring 31, and protrusions 312 are formed between adjacent slots 311. The winding coil 32 is arranged around the protrusions 312. The protrusions 312 provide support for the arrangement of the winding coil 32, making the winding coil 32 stable on the stator ring 31 and less likely to fall off or shift during use, which helps to ensure the braking effect.

[0037] In an optional embodiment, the winding coil 32 can be formed by winding the protrusion 312 with a wire along the axial direction of the flywheel rotor 2. Each winding coil 32 is then connected to the outside of the flywheel energy storage motor for power supply through a wire. The winding coil 32 is arranged along the axial direction of the flywheel rotor 2, which can realize the uniform distribution of multiple winding coils 32 on the stator ring 31, realize the integration of the winding coil 32 and the stator ring 31, and form an eddy current braking mechanism 3 in the shape of a complete circular ring.

[0038] In an optional embodiment, the slot 311 partially penetrates the inner wall of the stator ring 31, forming an edge 313 on the side of the protrusion 312 near the axis. The edge 313 can provide barrier protection for the winding coil 32, further ensuring that the winding coil 32 is stably installed on the stator ring 31, and can maintain a uniform annular air gap 4 with the flywheel rotor 2 through the edge 313.

[0039] In an optional embodiment, the length of the groove 311 along the arc length direction of the stator ring 31 can be set to be greater than the width along the radial direction of the stator ring 31, so as to facilitate the winding of the winding coil 32 on the protrusion 312. At the same time, it is also convenient to make partial penetration in the radial direction of the stator ring 31 through the groove 311 to form the edge 313.

[0040] In an optional embodiment, the protrusion 312 and the edge 313 are combined to form an arc-shaped surface on the side near the flywheel rotor 2, so that a uniform annular air gap 4 is formed between the flywheel rotor 2 and the eddy current braking mechanism 3.

[0041] In an optional embodiment, a disc motor 5 is coaxially mounted on the side of the brake disc 21 away from the flywheel disc 22. This can optimize the size of the flywheel energy storage motor, allowing it to maintain a better structural size after integrating the eddy current braking mechanism 3.

[0042] In an optional embodiment, the support housing 1 includes an outer shell 11, an upper cover plate 12, and a lower cover plate 13. The upper cover plate 12 and the lower cover plate 13 are positioned and detachably connected. The upper cover plate 12 and the lower cover plate 13 are embedded with bearings 6 that cooperate with the central shaft 24. The stator ring 31 is interference-fitted with the outer shell 11. Through the cooperation of the bearings 6, the central shaft 24, the upper cover plate 12, and the lower cover plate 13, the bearings 6 can be concentrically assembled, achieving stable braking of the flywheel rotor 2. Through the interference fit between the outer wall of the stator ring 31 and the outer shell 11, the eddy current braking mechanism 3 can be quickly and stably installed in the support housing 1, reducing the use of connecting parts and making the flywheel energy storage motor structure simpler. It can form a uniform and stable air gap around the flywheel rotor 2. By reasonably setting the axial distance between the disc motor 5 and the brake disc 21, and the axial distance between the brake disc 21 and the lower cover plate 13, the winding coil 32 can be stably integrated on the stator ring 31, maintaining normal operation.

[0043] In an optional embodiment, the interference between the outer wall of the stator ring 31 and the outer shell 11 can be designed according to the braking torque. The interference can be positively correlated with the braking torque to ensure that the stator ring 31 will not move relative to the outer shell 11 during braking and thus affect the braking effect.

[0044] In an optional embodiment, the flywheel disk 22 is clearance-fitted with the outer casing 11. This allows the diameter of the flywheel disk 22 to be larger than the diameter of the brake disk 21, providing an installation position for the eddy current braking mechanism 3 around the brake disk 21. This facilitates the rapid installation and integration of the eddy current braking mechanism 3 onto the flywheel energy storage motor, thereby achieving eddy current braking of the flywheel energy storage motor.

[0045] This embodiment of a flywheel energy storage motor with an eddy current braking system embeds an eddy current braking mechanism 3 within a support housing 1, forming an annular air gap 4 between the stator ring 31 and the flywheel rotor 2. This ensures uniformity of the air gap 4 space. When direct current is applied to the winding coil 32, a constant electromagnetic field is generated between the flywheel rotor 2 and the eddy current braking mechanism 3. This causes the high-speed rotating flywheel rotor 2 to continuously cut the magnetic field lines generated by the winding coil 32, forming a braking torque that opposes the rotation of the flywheel rotor 2. This achieves rapid and safe braking of the flywheel rotor 2, meeting the requirement of emergency braking to a safe stop in a very short time. Furthermore, by using an interference fit between the eddy current braking mechanism 3 and the support housing 1, installation is convenient and quick, requiring no additional connecting parts. This allows for rapid assembly and application on small-sized flywheel energy storage motors. Additionally, the braking torque can be linearly adjusted by changing the excitation current, enabling graded and precise control of the braking process according to the rotational speed. There is no mechanical wear or impact vibration during braking, resulting in a smooth braking process for the flywheel rotor 2 and a long service life.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flywheel energy storage motor with an eddy current braking system, characterized in that, The device includes a support housing (1), a flywheel rotor (2), and an eddy current braking mechanism (3). The eddy current braking mechanism (3) includes a stator ring (31) and a plurality of winding coils (32). The stator ring (31) is interference-fitted with the support housing (1). The stator ring (31) is arranged around the flywheel rotor (2). An annular air gap (4) is formed between the stator ring (31) and the flywheel rotor (2). A plurality of winding coils (32) are arranged on the stator ring (31).

2. The flywheel energy storage motor of the eddy current braking system according to claim 1, characterized in that, The flywheel rotor (2) includes a brake disc (21) and a flywheel disc (22) arranged coaxially. The brake disc (21) and the flywheel disc (22) are spaced apart along the axial direction, and the stator ring (31) is correspondingly arranged around the brake disc (21).

3. The flywheel energy storage motor of the eddy current braking system according to claim 2, characterized in that, A conductive layer (23) is provided on the outer wall of the brake disc (21).

4. The flywheel energy storage motor of the eddy current braking system according to claim 3, characterized in that, A plurality of grooves (311) are distributed on the stator ring (31), the grooves (311) penetrate the axial ends and inner wall of the stator ring (31), and the winding coil (32) is disposed in the grooves (311).

5. The flywheel energy storage motor of the eddy current braking system according to claim 4, characterized in that, A plurality of the grooves (311) are evenly distributed around the axis of the stator ring (31), and a protrusion (312) is formed between adjacent grooves (311), and the winding coil (32) is arranged around the protrusion (312).

6. The flywheel energy storage motor of the eddy current braking system according to claim 5, characterized in that, The groove (311) partially penetrates the inner wall of the stator ring (31) and forms an edge (313) on the side of the protrusion (312) near the axis.

7. A flywheel energy storage motor for an eddy current braking system according to any one of claims 4-6, characterized in that, The flywheel rotor (2) includes a central shaft (24), and the brake disc (21) and / or the flywheel disc (22) are integral structural components with the central shaft (24).

8. The flywheel energy storage motor of the eddy current braking system according to claim 7, characterized in that, The brake disc (21) is coaxially mounted with a disc motor (5) on the side away from the flywheel disc (22).

9. A flywheel energy storage motor for an eddy current braking system according to claim 7, characterized in that, The supporting housing (1) includes an outer shell (11), an upper cover plate (12) and a lower cover plate (13). The upper cover plate (12) and the lower cover plate (13) are positioned and detachably connected. The upper cover plate (12) and the lower cover plate (13) are embedded with bearings (6) that cooperate with the central shaft (24). The stator ring (31) is interference-fitted with the outer shell (11).

10. A flywheel energy storage motor for an eddy current braking system according to claim 9, characterized in that, The flywheel (22) is fitted with the outer casing (11) with a clearance.

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