Disc-shaped permanent magnet eddy current braking device and railway vehicle

Abstract

A disc-shaped permanent magnet eddy current braking device, comprising an axle (70), a brake disc (10) mounted on the axle (70), and a permanent magnet eddy current braking device located on a side of the brake disc (10). The permanent magnet eddy current braking device comprises an outer race permanent magnet assembly (30) and an inner race permanent magnet assembly (40). The outer race permanent magnet assembly (30) comprises a plurality of outer race permanent magnets (31) which are uniformly distributed in the circumferential direction, S poles and N poles of the outer race permanent magnets (31) being successively and alternately arranged. The inner race permanent magnet assembly (40) comprises a plurality of inner race permanent magnets (41) which are uniformly distributed in the circumferential direction, S poles and N poles of the inner race permanent magnets (41) being successively and alternately arranged. The inner race permanent magnet assembly (40) can rotate with respect to the outer race permanent magnet assembly (30), so as to control a braking force by changing the phases of the inner race permanent magnets (41). The device uses the permanent magnets to generate a magnetic field to prevent the brake disc from rotating, and uses a drive motor to control a stator to rotate so as to activate and deactivate an eddy current and the braking force, thereby replacing friction braking, and reducing the abrasion of friction pairs.

Description

Disc-shaped permanent magnet eddy current braking device and rail vehicle

[0001] This application claims priority to the invention patent application filed with the China Patent Office on July 11, 2023, with application number 202310849377.3 and invention name “Disc-shaped permanent magnet eddy current braking device and rail vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of rail vehicles, and in particular to a disc-shaped permanent magnet eddy current brake device for rail vehicles. The present invention also relates to a rail vehicle provided with the disc-shaped permanent magnet eddy current brake device. Background Art

[0003] As EMU speeds increase, braking systems face significant challenges. Traditional friction braking is limited by the thermal properties of friction materials. Excessively high operating speeds can lead to increased wear of the brake discs and pads, reduced friction performance, and even thermal cracking of the discs or failure of fasteners. Therefore, combining non-friction braking with friction braking technology is a rational choice for high-speed EMUs.

[0004] Non-friction braking technologies mainly include resistance braking, regenerative braking, and eddy current braking. Resistance braking and regenerative braking cannot be used on trailer bogies without traction motors, while eddy current braking is not subject to this limitation.

[0005] Eddy current brakes are divided into disc brakes and linear brakes. The principle of eddy current brakes is that a conductor in a magnetic field cuts through magnetic flux lines, generating an induced current. According to Lenz's law, the magnetic force (Ampere's force) on the induced current in the conductor always resists (or hinders) the motion of the conductor. In other words, the magnetic field has the effect of "rejecting incoming current and retaining outgoing current" on the conductor.

[0006] Linear eddy current braking is similar to magnetic rail braking. It involves lowering an electromagnet a few millimeters above the rail surface, preventing it from contacting the rail. The relative motion of the electromagnet and rail induces eddy currents in the rail. The resulting braking force converts the train's kinetic energy into heat, which is dissipated into the atmosphere through the rail. Linear eddy current braking has been used on Germany's ICE3 EMUs, but track temperature rise has a direct impact on operational safety and can interfere with track signal transmission.

[0007] Disc eddy current braking involves installing a metal induction disc (brake disc) and a magnetic field generator on the axle or gearbox output shaft. During braking, the magnetic field induces strong eddy currents on the rotating disc's surface, generating braking force and converting the train's kinetic energy into heat that is dissipated into the atmosphere. Disc eddy current braking is used on Japan's 100-series and 300-series EMUs.

[0008] Most existing disc brakes use electromagnet excitation. The magnetic field strength and on / off switching are adjusted by the coil current, making control easy. However, actual research and application have revealed a serious problem with electromagnetic eddy current braking: the extremely large excitation coils require a significant current, resulting in a heavy braking system. For example, a set of eddy current disc brakes used in Japan's 300-series EMUs weighs approximately one ton.

[0009] In summary, it is necessary to develop a disc-shaped eddy current brake device that does not rely on electromagnet excitation, that is, a permanent disc-shaped eddy current brake device.

[0010] Summary of the Invention

[0011] The present invention aims to provide a disc-shaped permanent magnet eddy current brake device. This device uses a permanent magnet (stator) to generate a magnetic field to prevent the rotation of the brake disc (rotor). A motor controls the rotation of the stator to activate and deactivate the eddy current and braking force. This device can replace friction braking and reduce wear on the friction pair.

[0012] To achieve the above objectives, the present invention provides a disc-shaped permanent magnet eddy current brake device, comprising an axle, a brake disc mounted on the axle, and a permanent magnet eddy current brake device located on one side of the brake disc; the permanent magnet eddy current brake device comprises an outer ring permanent magnet assembly and an inner ring permanent magnet assembly, the outer ring permanent magnet assembly comprises a plurality of groups of outer ring permanent magnets uniformly distributed in the circumferential direction, the S poles and N poles of the outer ring permanent magnets being arranged alternately in sequence; the inner ring permanent magnet assembly comprises a plurality of groups of inner ring permanent magnets uniformly distributed in the circumferential direction, the S poles and N poles of the inner ring permanent magnets being arranged alternately in sequence; the inner ring permanent magnet assembly is capable of rotating relative to the outer ring permanent magnet assembly to control the braking force by changing the phase of the inner ring permanent magnets.

[0013] Optionally, the magnetic poles of the outer ring permanent magnet and the inner ring permanent magnet are both perpendicular to the disc surface of the brake disc.

[0014] Optionally, a magnetic yoke is provided on one end of the outer ring permanent magnet and the inner ring permanent magnet facing the brake disc respectively.

[0015] Optionally, it further includes pole pieces corresponding to the outer ring permanent magnets and the inner ring permanent magnets, and the pole pieces have the same phase as the outer ring permanent magnets.

[0016] Optionally, a spring is provided at one end of the outer ring permanent magnet and the inner ring permanent magnet away from the brake disc, so as to keep the outer ring permanent magnet and the inner ring permanent magnet in full contact with the corresponding magnetic yoke and pole piece through elastic force.

[0017] Optionally, the outer ring permanent magnet assembly and the inner ring permanent magnet assembly are installed in a support box, the support box is connected to the frame through a connecting rod, and is rotatably matched with the axle through a bearing.

[0018] Optionally, the outer ring permanent magnet assembly and the inner ring permanent magnet assembly are installed inside the support box through two parallel mounting disks, and a plurality of outer ring fixing seats are provided on the mounting disks. The outer ring permanent magnet and the yoke are located inside the outer ring fixing seats, and the inner ring permanent magnet and the yoke are located in the slots of the inner ring turntable, and the inner ring turntable can rotate relative to the mounting disks.

[0019] Optionally, the pole piece is fixed to a side of the support box adjacent to the brake disc.

[0020] Optionally, a driving motor is provided inside the supporting box, and the inner ring turntable is provided with a gear ring. The driving motor is engaged with the gear ring through gears to drive the inner ring turntable to rotate.

[0021] To achieve the above-mentioned other object, the present invention provides a rail vehicle, comprising a vehicle body, a frame and a braking device, characterized in that the braking device is a disc-shaped permanent magnet eddy current braking device as described in any of the above-mentioned technical solutions.

[0022] The disc-shaped permanent magnet eddy current brake device provided by the present invention uses permanent magnet technology to solve the problem of excessive weight of the stator coil of the disc-shaped eddy current brake device, and can better meet the requirements of practical applications. Because it is a non-friction braking technology, it does not generate friction pair wear, brake dust and noise pollution. Moreover, the use of permanent magnets to generate a magnetic field does not require an external excitation power supply and excitation winding, which can greatly save braking electricity and copper, reduce the weight of the eddy current brake device, and achieve lightweight and miniaturization of the eddy current brake device. It can maintain the stability and durability of the braking force, avoid the risk of brake failure during power outages, and has higher reliability. Compared with air brakes, the braking force is applied more linearly, which can reduce the longitudinal impact during train braking and improve ride comfort.

[0023] The rail vehicle provided by the present invention is provided with the disc-shaped permanent magnet eddy current brake device. Since the disc-shaped permanent magnet eddy current brake device has the above-mentioned technical effects, the rail vehicle provided with the disc-shaped permanent magnet eddy current brake device should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a braking principle diagram of a disc-shaped permanent magnet eddy current braking device provided by an embodiment of the present invention;

[0025] FIG2 is a schematic diagram of eddy currents generated by the brake disc shown in FIG1 ;

[0026] FIG3 is a partial schematic diagram of the inner ring permanent magnet and the outer ring permanent magnet with the same phase and opposite magnetic poles when there is no braking force;

[0027] FIG4 is a longitudinal sectional view of FIG3;

[0028] FIG5 is a partial schematic diagram showing that the magnetic poles of the inner ring permanent magnet and the outer ring permanent magnet are aligned with each other when a braking force is applied;

[0029] FIG6 is a longitudinal sectional view of FIG5;

[0030] FIG7 is a schematic structural diagram of a disc-shaped permanent magnet eddy current brake device provided by an embodiment of the present invention;

[0031] FIG8 is a schematic diagram of the magnetic pole distribution of the disc-shaped permanent magnet eddy current brake device shown in FIG7 when it is in a braking state;

[0032] FIG9 is a schematic diagram of the magnetic pole distribution of the disk-shaped permanent magnet eddy current brake device shown in FIG7 when it is in motion.

[0033] In the picture:

[0034] 10. Brake disc 20. Eddy current 30. Outer ring permanent magnet assembly 31. Outer ring permanent magnet 32. Outer ring fixed seat 33. Outer ring yoke 40. Inner ring permanent magnet assembly 41. Inner ring permanent magnet 42. Inner ring turntable 43. Inner ring yoke 50. Spring 60. Pole piece 70. Axle 80. Support box 90. Bearing 110. First mounting plate 120. Second mounting plate 130. Drive motor 140. Gear 150. Locating pin DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] In this article, terms such as "upper, lower, inside, outside" are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" are only used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0037] Please refer to Figures 1 and 2. Figure 1 is a braking principle diagram of a disc-shaped permanent magnet eddy current brake device provided by an embodiment of the present invention; Figure 2 is a schematic diagram of eddy current generated by the brake disc shown in Figure 1.

[0038] The disc-shaped permanent magnet eddy current brake device provided by the present invention has the following braking principle:

[0039] On one side of the brake disc, permanent magnets are arranged alternately in the order of south pole, north pole (or north pole, south pole) along the direction of rotation. When these magnets are brought close to the brake disc 10, eddy currents 20 are generated on the surface of the disc 10. These eddy currents 20 generate a magnetic field, which exerts a Lorentz force that resists the rotation of the disc 10, manifesting as a braking force on the disc 10. Because the resistance of the disc 10 is very low, the generated eddy currents 20 are very strong. The strong current cutting through the magnetic lines of force in the magnetic field also generates a strong Lorentz force. Therefore, using a rotating permanent magnet eddy current brake device can achieve a significant braking force.

[0040] Please refer to Figures 3 to 6. Figure 3 is a partial schematic diagram of the inner ring permanent magnet and the outer ring permanent magnet with the same phase and opposite magnetic poles when there is no braking force; Figure 4 is a longitudinal cross-sectional view of Figure 3; Figure 5 is a partial schematic diagram of the inner ring permanent magnet and the outer ring permanent magnet with the same phase and consistent magnetic poles when there is braking force; Figure 6 is a longitudinal cross-sectional view of Figure 5.

[0041] The disc-shaped permanent magnet eddy current brake device provided by the present invention has permanent magnets arranged in two groups: an outer ring permanent magnet assembly 30 and an inner ring permanent magnet assembly 40. The outer ring permanent magnet assembly 30 has multiple groups of outer ring permanent magnets 31 evenly distributed along the circumferential direction, and the S poles and N poles of the outer ring permanent magnets 31 are arranged alternately in sequence. The inner ring permanent magnet assembly 40 has multiple groups of inner ring permanent magnets 41 evenly distributed along the circumferential direction, and the S poles and N poles of the inner ring permanent magnets 41 are arranged alternately in sequence. The outer ring permanent magnet assembly 30 is fixed, and the inner ring permanent magnet assembly 40 can rotate (along the circumferential direction) relative to the outer ring permanent magnet assembly 30 by the distance between at least one pair of magnetic poles to change the corresponding relationship between the magnetic poles of the inner ring permanent magnet 41 and the outer ring permanent magnet 31, so that the magnetic poles of the inner ring permanent magnet 41 and the outer ring permanent magnet 31 with the same phase are consistent or opposite, and can transform and transition between the two consistent or opposite states.

[0042] When the train is operating normally, the outer ring permanent magnets 31 and the inner ring permanent magnets 41 with the same phase have opposite magnetic poles, and the magnetic field forms a closed loop through the pole piece 60. The magnetic field does not pass through the brake disc 10, so no eddy current is generated in the brake disc 10, and thus no braking force is generated on the brake disc 10.

[0043] During the train braking process, a power drive device (such as a motor) is used to rotate the inner ring permanent magnet 41 so that the magnetic poles of the outer ring permanent magnet 31 and the inner ring permanent magnet 31 with the same phase are consistent. The magnetic field passes through the pole piece 60 to form a closed loop in the brake disc 10. At this time, there is a magnetic field in the brake disc 10. As the brake disc 10 rotates, eddy currents are generated, thereby generating braking force, that is, the braking force at this time is 100%.

[0044] In the state shown in Figures 3 and 4, the braking force is 0%, and in the state shown in Figures 5 and 6, the braking force is 100%. The inner ring permanent magnet 41 rotates continuously. In theory, the braking force can be continuously increased or decreased to achieve stepless adjustment, that is, the braking force can be adjusted from 0% to 100%.

[0045] Please continue to refer to FIG. 7 , which is a schematic structural diagram of a disc-shaped permanent magnet eddy current braking device provided by an embodiment of the present invention.

[0046] In a specific embodiment, the disc-shaped permanent magnet eddy current brake device provided by the present invention is mainly composed of a brake disc 10, an axle 70, and a permanent magnet eddy current brake device. The brake disc 10 is installed on the axle 70, and the permanent magnet eddy current brake device is located on one side of the brake disc 10, wherein the permanent magnet eddy current brake device is provided with an outer ring permanent magnet component 30 and an inner ring permanent magnet component 40.

[0047] The outer ring permanent magnet assembly 30 and the inner ring permanent magnet assembly 40 are installed in the support box 80. The support box 80 is connected to the frame through a connecting rod and rotates with the axle 70 through the bearing 90, so that the support box 80 remains relatively stationary when the vehicle is running.

[0048] Specifically, the outer ring permanent magnet assembly 30 and the inner ring permanent magnet assembly 40 are installed inside the support box 80 through two parallel first mounting plates 110 and second mounting plates 120. The first mounting plates 110 and the second mounting plates 120 are provided with outer ring fixing seats 32. The outer ring permanent magnet 31 and the outer ring yoke 33 of the outer ring permanent magnet assembly 30 are placed inside the outer ring fixing seat 32. The inner ring permanent magnet 41 and the inner ring yoke 43 of the inner ring permanent magnet assembly 40 are located in the slot of the inner ring turntable 42. The inner ring turntable 42 can rotate relative to the first mounting plate 110 and the second mounting plate 120.

[0049] The inner ring turntable 42 has a cross-sectional shape similar to that of the outer ring fixing seat 32 , except that the outer ring fixing seat 32 is composed of several circumferentially distributed individual units, while the inner ring turntable 42 can be a circumferentially rotating integral component.

[0050] The magnetic poles of the outer ring permanent magnet 31 and the inner ring permanent magnet 41 are perpendicular to the disk surface of the brake disk 10. Nd-Fe-B rare earth permanent magnets with high magnetic energy product, high coercive force and other characteristics can be selected, which can continuously generate a strong magnetic field without current excitation.

[0051] The outer ring permanent magnet 31 and the inner ring permanent magnet 41 are respectively provided with an outer ring magnetic yoke 33 and an inner ring magnetic yoke 43 at one end facing the brake disc. The outer ring magnetic yoke 33 and the inner ring magnetic yoke 43 themselves do not generate a magnetic field. They only play the role of transmitting and restraining magnetic lines of force in the magnetic circuit, preventing the magnetic lines of force from dispersing outward and concentrating the magnetic line bundle to improve the efficiency of the mechanism.

[0052] In this embodiment, twelve sets of outer ring permanent magnets 31 and outer ring yokes 33 are placed in twelve outer ring fixing seats 32 and are evenly spaced every 30° along the circumference. The outer ring fixing seats 32 are fixed to the interior of the support box 80 via first and second mounting plates 110 and 120. Twelve sets of inner ring permanent magnets 41 and inner ring yokes 43 are placed in twelve slots of the inner ring rotating disk 42 and are evenly spaced every 30° along the circumference.

[0053] Of course, the inner ring permanent magnet 41 and the inner ring magnetic yoke 42 can also be installed inside the support box 80 through a third mounting plate and a fourth mounting plate that are separately provided.

[0054] The pole pieces 60 correspond to the outer ring permanent magnets 31 and the inner ring permanent magnets 41, and their phases are the same as those of the outer ring permanent magnets 31. There are twelve groups in total, which are evenly arranged every 30° along the circumferential direction. The pole pieces 60 are fixed to the side of the support box 80 adjacent to the brake disc 10, and a small gap is maintained between the pole pieces 60 and the brake disc 10. The pole pieces 60 can be made of materials with good magnetic conductivity to better transmit magnetic lines of force.

[0055] The outer ring permanent magnet 31 and the inner ring permanent magnet 41 are respectively provided with a pre-compressed spring 50 at the end away from the brake disc 10, so that the outer ring permanent magnet 31 and the inner ring permanent magnet 41 maintain full contact with the corresponding magnetic yoke and pole piece 60 through elastic force. After installation, the outer ring magnetic yoke 33 and the outer ring fixing seat 32 are positioned by the positioning pin 150 to keep the position of the outer ring magnetic yoke 33 fixed.

[0056] A drive motor 130 is provided inside the support box 80, and the inner ring turntable 42 is provided with a ring gear. The drive motor is engaged with the ring gear through the gear 140 to drive the inner ring turntable 42 to rotate, thereby changing the phase of the inner ring permanent magnet 41 to achieve the purpose of controlling the braking force.

[0057] Please refer to Figures 8 and 9 together. Figure 8 is a schematic diagram of the magnetic pole distribution of the disc-shaped permanent magnet eddy current brake device shown in Figure 7 when it is in a braking state; Figure 9 is a schematic diagram of the magnetic pole distribution of the disc-shaped permanent magnet eddy current brake device shown in Figure 7 when it is in a moving state.

[0058] In the braking state, the motor 130 drives the inner ring turntable 42 to rotate. When the magnetic poles of the inner ring permanent magnet 41 and the outer ring permanent magnet 31 with the same phase are aligned, the magnetic field passes through the pole piece 60 to form a closed loop inside the brake disc 10 to generate a magnetic field. As the brake disc 10 rotates, eddy currents are generated inside the brake disc 10, thereby generating braking force.

[0059] Under normal operating conditions, the motor 130 drives the inner ring turntable 42 to rotate again, so that the magnetic poles of the inner ring permanent magnet 41 and the outer ring permanent magnet 31 with the same phase are opposite, and the magnetic field passes through the pole piece 60 to form a closed loop. The magnetic field does not pass through the brake disc 10, and the braking force is reduced to zero.

[0060] The above embodiment is merely a preferred solution of the present invention and is not intended to be limiting. Based on this, targeted adjustments can be made based on actual needs to achieve different implementations. For example, the outer ring permanent magnet assembly 30 and the inner ring permanent magnet assembly 40 can be mounted within the support box 80 using other methods, or the inner ring rotary disk 42 can be driven to rotate using other methods. Due to the numerous possible implementations, we will not provide a detailed description of each of these methods here.

[0061] The disc-shaped permanent magnet eddy current brake device uses a combination of permanent magnets, magnetic yokes and pole pieces to generate and transmit magnetic fields. The outer ring permanent magnet 31 is fixed, and the inner ring permanent magnet 41 is driven to rotate by the motor 130, thereby controlling the opening and closing of the braking force. The permanent magnet generates a magnetic field, which can avoid the use of excitation coils, thereby achieving lightweight and miniaturization of the brake device. Moreover, the use of a rotary eddy current braking method avoids the impact of linear eddy current braking on the track. Compared with air braking, no longitudinal impact is generated.

[0062] In addition to the above-mentioned disc-shaped permanent magnet eddy current brake device, the present invention also provides a rail vehicle having a vehicle body, a frame and a brake device, wherein the brake device is the disc-shaped permanent magnet eddy current brake device described above. Regarding the remaining structure of the rail vehicle, please refer to the prior art and will not be repeated in this article.

[0063] The above is a detailed introduction to the disc-shaped permanent magnet eddy current brake device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the core concept of the present invention. It should be noted that for those skilled in the art, various improvements and modifications can be made to the present invention without departing from the principles of the present invention. Such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A disc-shaped permanent magnet eddy current brake device, characterized in that: The invention comprises an axle (70), a brake disc (10) mounted on the axle (70), and a permanent magnet eddy current brake device located on one side of the brake disc (10); the permanent magnet eddy current brake device comprises an outer ring permanent magnet assembly (30) and an inner ring permanent magnet assembly (40); the outer ring permanent magnet assembly (30) comprises a plurality of groups of outer ring permanent magnets (31) uniformly distributed in a circumferential direction, the S poles and N poles of the outer ring permanent magnets (31) are arranged alternately in sequence; the inner ring permanent magnet assembly (40) comprises a plurality of groups of inner ring permanent magnets (41) uniformly distributed in a circumferential direction, the S poles and N poles of the inner ring permanent magnets (41) are arranged alternately in sequence; the inner ring permanent magnet assembly (40) can rotate relative to the outer ring permanent magnet assembly (30) to control the braking force by changing the phase of the inner ring permanent magnet (41).

2. The disc-shaped permanent magnet eddy current brake device according to claim 1, characterized in that: The magnetic poles of the outer ring permanent magnet (31) and the inner ring permanent magnet (41) are both perpendicular to the disk surface of the brake disk (10).

3. The disc-shaped permanent magnet eddy current brake device according to claim 2, characterized in that: A magnetic yoke is provided on one end of the outer ring permanent magnet (31) and the inner ring permanent magnet (41) facing the brake disc (10).

4. The disc-shaped permanent magnet eddy current brake device according to claim 3, characterized in that: It further comprises pole pieces (60) corresponding to the outer ring permanent magnets (31) and the inner ring permanent magnets (41), wherein the pole pieces (60) have the same phase as the outer ring permanent magnets (31).

5. The disc-shaped permanent magnet eddy current brake device according to claim 4, characterized in that: A spring (50) is provided at one end of the outer ring permanent magnet (31) and the inner ring permanent magnet (41) away from the brake disc (10), so as to keep the outer ring permanent magnet (31) and the inner ring permanent magnet (41) in full contact with the corresponding magnetic yoke and pole piece (60) through elastic force.

6. The disc-shaped permanent magnet eddy current brake device according to claim 5, characterized in that: The outer ring permanent magnet assembly (30) and the inner ring permanent magnet assembly (40) are installed inside a support box (80). The support box (80) is connected to the frame through a connecting rod and is rotatably matched with the axle (70) through a bearing (90).

7. The disc-shaped permanent magnet eddy current brake device according to claim 6, characterized in that: The outer ring permanent magnet assembly (30) and the inner ring permanent magnet assembly (40) are installed inside the support box (80) through two parallel mounting disks, and a plurality of outer ring fixing seats (32) are provided on the mounting disk. The outer ring permanent magnet (31) and the yoke are located inside the outer ring fixing seat (32), and the inner ring permanent magnet (41) and the yoke are located in the slot of the inner ring turntable (42), and the inner ring turntable (42) can rotate relative to the mounting disk.

8. The disc-shaped permanent magnet eddy current brake device according to claim 7, characterized in that: The pole piece (60) is fixed on a side of the support box (80) adjacent to the brake disc (10).

9. The disc-shaped permanent magnet eddy current brake device according to claim 7 or 8, characterized in that: A driving motor (130) is provided inside the supporting box (80), and the inner ring rotating disk (42) is provided with a gear ring. The driving motor (130) is meshed with the gear ring through a gear (140) to drive the inner ring rotating disk (42) to rotate.

10. A rail vehicle comprising a vehicle body, a frame and a braking device, characterized in that: The braking device is a disc-shaped permanent magnet eddy current braking device as described in any one of claims 1 to 9.

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