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

Abstract

A disc-shaped permanent magnet eddy current brake device comprises an axle (70), a brake disc (10) attached to the axle (70), and a permanent magnet eddy current brake device located on one side of the brake disc (10), wherein the permanent magnet eddy current brake device comprises an outer ring permanent magnet unit (30) and an inner ring permanent magnet unit (40), the outer ring permanent magnet unit (30) comprises a plurality of sets of outer ring permanent magnet bodies (31) uniformly distributed along the circumferential direction, the S poles and N poles of the outer ring permanent magnet bodies (31) are arranged alternately in sequence, the inner ring permanent magnet unit (40) comprises a plurality of sets of inner ring permanent magnet bodies (41) uniformly distributed along the circumferential direction, the S poles and N poles of the inner ring permanent magnet bodies (41) are arranged alternately in sequence, and the inner ring permanent magnet unit (40) is rotatable relative to the outer ring permanent magnet unit (30) to control the braking force by changing the phase of the inner ring permanent magnet bodies (41). This device generates a magnetic field using permanent magnets to prevent the rotation of the brake disc, and controls the rotation of the stator by a drive motor, thereby generating or stopping eddy currents and braking force, replacing friction brakes and reducing wear on the friction pair.

Description

Technical Field

[0001] This application claims the priority of the invention patent application with the application number 202310849377.3 and the invention title of "Disk-shaped Permanent Magnet Eddy Current Brake Device and Railway Vehicle", which was filed with the China Patent Office on July 11, 2023, and all of its contents are incorporated herein by reference.

[0002] The present invention relates to the technical field of railway vehicles, and in particular, to a disk-shaped permanent magnet eddy current brake device for railway vehicles. The present invention further relates to a railway vehicle provided with the disk-shaped permanent magnet eddy current brake device.

Background Art

[0003] With the improvement of the speed of high-speed trains, the brake device is facing serious challenges. The traditional friction brake is limited by the thermal performance of the friction material. When the running speed is too high, it will cause deterioration of the wear of the brake disc and the brake lining, reduce the friction performance, and further cause phenomena such as thermal cracking of the brake disc or failure of the fasteners. Therefore, the technical combination of non-friction brake and friction brake is a reasonable combination for high-speed trains.

[0004] As non-friction brake technologies, there are mainly resistance brakes, regenerative brakes and eddy current brakes. Resistance brakes and regenerative brakes cannot be used for trailer bogie cars without traction motors, while eddy current brakes are not limited by this.

[0005] Eddy current brakes can be divided into disk brakes and linear eddy current brakes. As the principle of eddy current brakes, in a magnetic field, a conductor cuts magnetic flux lines to generate an induced current. According to Lenz's law, the magnetic force (Ampere's force) received by the induced current in the conductor always resists (or blocks) the movement of the conductor. That is, the magnetic field has the effect of "repelling approach and retaining separation" on the conductor.

[0006] Linear eddy current braking is similar to magnetic rail brakes, where electromagnets are lowered a few millimeters above the rail surface so as not to touch the rail. The braking force generated by the eddy currents induced in the rail by the relative motion of the electromagnets and rails converts the train's kinetic energy into thermal energy, which is then dissipated into the atmosphere via the rails. Linear eddy current brakes have already been applied to high-speed trains of the German ICE3 type; however, the rise in rail temperature directly affects running safety and also impacts the transmission of railway signals.

[0007] Eddy current disc brakes are installed on the axle or the output shaft of the gear housing, with a metal induction disc (brake disc) and a magnetic field generator attached. When braking, the magnetic field induces strong eddy currents from the surface of the rotating induction disc, generating braking force and converting the train's kinetic energy into heat that dissipates into the atmosphere. Eddy current disc brakes are used on Japan's 100 series and 300 series high-speed trains.

[0008] Conventional eddy current disc brakes are mostly excited by electromagnets, and the magnitude of the magnetic field, as well as its generation and deactivation, are adjusted based on the magnitude of the current in the coil, making them easy to control. However, as discovered during actual research and application, electromagnetic eddy current brakes have a significant problem: they require extremely large currents for extremely large excitation coils, and therefore the brake system is very heavy. For example, the mass of one set of eddy current disc brakes applied to Japan's 300 series high-speed trains is approximately 1 ton.

[0009] As described above, there is a need to develop an eddy current disc brake system that does not rely on electromagnet excitation, that is, a permanent magnet eddy current disc brake system. [Overview of the project] [Problems that the invention aims to solve]

[0010] The present invention aims to provide a disc-shaped permanent magnet eddy current brake device. This device generates a magnetic field using a permanent magnet (stator) to prevent the rotation of a brake disc (rotor), and controls the rotation of the stator by a drive motor, thereby generating eddy currents and braking force to stop the vehicle. This can replace friction brakes and reduce wear on the friction pair. [Means for solving the problem]

[0011] To achieve the above objective, 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, wherein the permanent magnet eddy current brake device comprises an outer ring permanent magnet unit and an inner ring permanent magnet unit, the outer ring permanent magnet unit comprising a plurality of sets of outer ring permanent magnet bodies uniformly distributed along the circumferential direction, the S poles and N poles of the outer ring permanent magnet bodies being arranged alternately in sequence, the inner ring permanent magnet unit comprising a plurality of sets of inner ring permanent magnet bodies uniformly distributed along the circumferential direction, the S poles and N poles of the inner ring permanent magnet bodies being arranged alternately in sequence, and the inner ring permanent magnet unit is rotatable relative to the outer ring permanent magnet unit to control the braking force by changing the phase of the inner ring permanent magnet bodies.

[0012] Preferably, the magnetic poles of both the outer ring permanent magnet and the inner ring permanent magnet are perpendicular to the disc surface of the brake disc.

[0013] Preferably, a magnetic yoke is provided at one end of the outer ring permanent magnet body and the inner ring permanent magnet body that faces the brake disc.

[0014] Preferably, the system further includes electrode plates corresponding to the outer ring permanent magnet and the inner ring permanent magnet, wherein the phases of the electrode plates and the outer ring permanent magnet are the same.

[0015] Preferably, a spring is provided at one end of the outer ring permanent magnet and the inner ring permanent magnet that is away from the brake disc, thereby maintaining sufficient contact between the outer ring permanent magnet and the inner ring permanent magnet and the corresponding magnetic yoke and electrode plate through elasticity.

[0016] Preferably, the outer ring permanent magnet unit and the inner ring permanent magnet unit are mounted within a support casing, the support casing is connected to a frame by a connecting rod and is rotatably engaged with the axle by a bearing.

[0017] Preferably, the outer ring permanent magnet unit and the inner ring permanent magnet unit are mounted inside the support casing by two parallel mounting discs, the mounting discs are provided with several outer ring fixing bases, the outer ring permanent magnet body and magnetic yoke are located inside the outer ring fixing bases, the inner ring permanent magnet body and magnetic yoke are located in slots of the inner ring rotating disc, and the inner ring rotating disc is rotatable relative to the mounting disc.

[0018] Preferably, the electrode plate is fixed to the side of the support casing adjacent to the brake disc.

[0019] Preferably, a drive motor is provided inside the support casing, a ring gear is provided on the inner ring rotating disk, and the drive motor drives the inner ring rotating disk to rotate by meshing with the ring gear via a gear and transmitting power.

[0020] To achieve the other objectives described above, the present invention provides a railway vehicle comprising a body, a frame, and a braking system, wherein the braking system is a disc-shaped permanent magnet eddy current brake system described in any one of the above-described technical proposals. [Effects of the Invention]

[0021] The disk-shaped permanent magnet eddy current brake device provided by the present invention uses permanent magnet technology, solves the problem that the stator coil of the eddy current disk brake device is too heavy, and better meets the actual application requirements. Since it belongs to non-friction brake technology, it does not cause wear of the friction pair, dust caused by braking, and noise pollution. Also, when a magnetic field is generated by a permanent magnet, it does not require an external excitation power source and excitation winding, greatly reducing the power consumption and copper usage of the brake, reducing the weight of the eddy current brake device, achieving the lightweight and miniaturization of the eddy current brake device, maintaining the stability and sustainability of the braking force, avoiding the risk of brake failure during a power outage, having higher reliability, and for an air brake, the application of the braking force is more linear, reducing the longitudinal impact when the train brakes and improving the riding comfort.

[0022] The railway vehicle provided by the present invention is provided with the disk-shaped permanent magnet eddy current brake device. Since the disk-shaped permanent magnet eddy current brake device has the above technical effects, the railway vehicle provided with the disk-shaped permanent magnet eddy current brake device also has corresponding technical effects.

Brief Description of the Drawings

[0023] [Figure 1] It is a principle diagram of the brake of the disk-shaped permanent magnet eddy current brake device provided by an embodiment of the present invention. [Figure 2] It is a schematic diagram of generating eddy currents from the brake disk in FIG. 1. [Figure 3] It is a local schematic diagram where the magnetic poles of the inner ring permanent magnet body and the outer ring permanent magnet body of the same phase are opposite when there is no braking force. [Figure 4] It is a longitudinal sectional view of FIG. 3. [Figure 5] It is a local schematic diagram where the magnetic poles of the inner ring permanent magnet body and the outer ring permanent magnet body of the same phase coincide when there is a braking force. [Figure 6] It is a longitudinal sectional view of FIG. 5. [[ID=2**]] [Figure 7] It is a structural schematic diagram of the disk-shaped permanent magnet eddy current brake device provided by an embodiment of the present invention. [Figure 8] FIG. 7 is a schematic diagram of the magnetic pole distribution when the disk-shaped permanent magnet eddy current brake device is in the braking state. [Figure 9] FIG. 7 is a schematic diagram of the magnetic pole distribution when the disk-shaped permanent magnet eddy current brake device is in the moving state.

Embodiments for Carrying out the Invention

[0024] In order for those skilled in the art to better understand the solution of the present invention, the present invention will be described in more detail below by combining the drawings and specific embodiments.

[0025] In this specification, terms such as "upper, lower, inner, outer" are established based on the positional relationship in the drawings, and depending on different drawings, the corresponding positional relationship may also change. Therefore, it is not an absolute limitation on the protection scope. Also, relational terms such as "first" and "second" are merely used to distinguish members having the same name, and it is not necessarily required or implied that there is such an actual relationship or order between these members.

[0026] Referring to FIGS. 1 and 2, FIG. 1 is a brake principle diagram of the disk-shaped permanent magnet eddy current brake device provided by an embodiment of the present invention, and FIG. 2 is a schematic diagram of generating eddy currents from the brake disk of FIG. 1.

[0027] The brake principle of the disk-shaped permanent magnet eddy current brake device provided by the present invention is as follows: On one side of the brake disc, permanent magnets are arranged alternately in the order of S pole, N pole (or N pole, S pole) along the direction of rotation. When the magnets are brought close to the brake disc 10, eddy currents 20 are generated on the surface of the brake disc 10. These eddy currents 20 generate a magnetic field, causing a Lorentz force to act in a direction that opposes the rotation of the brake disc 10, which in the case of a brake disc 10 is a braking force. Because the resistance of the brake disc 10 is small, the strength of the generated eddy currents 20 is large, and a strong current in a magnetic field cuts magnetic field lines, resulting in a strong Lorentz force. Therefore, a large braking force can be obtained by using a rotating permanent magnet eddy current brake device.

[0028] Referring to Figures 3 to 6, Figure 3 is a local schematic diagram where the magnetic poles of the inner and outer permanent magnets are opposite when there is no braking force, Figure 4 is a vertical cross-sectional view of Figure 3, Figure 5 is a local schematic diagram where the magnetic poles of the inner and outer permanent magnets are the same when there is a braking force, and Figure 6 is a vertical cross-sectional view of Figure 5.

[0029] In the disc-shaped permanent magnet eddy current brake device provided by the present invention, the permanent magnets are arranged in two sets, including an outer ring permanent magnet unit 30 and an inner ring permanent magnet unit 40. The outer ring permanent magnet unit 30 comprises multiple sets of outer ring permanent magnet bodies 31 uniformly distributed along the circumferential direction, with the S poles and N poles of the outer ring permanent magnet bodies 31 arranged alternately in sequence. The inner ring permanent magnet unit 40 comprises multiple sets of inner ring permanent magnet bodies 41 uniformly distributed along the circumferential direction, with the S poles and N poles of the inner ring permanent magnet bodies 41 arranged alternately in sequence. The outer ring permanent magnet unit 30 is fixed, and the inner ring permanent magnet unit 40 can rotate (along the circumferential direction) by a distance of at least one pair of magnetic poles relative to the outer ring permanent magnet unit 30. This changes the correspondence between the magnetic poles of the inner ring permanent magnet bodies 41 and the outer ring permanent magnet bodies 31, causing the magnetic poles of the in-phase inner ring permanent magnet bodies 41 and outer ring permanent magnet bodies 31 to coincide or be opposite, and to transition between these two states of coincidence or opposition.

[0030] When the train is running normally, the magnetic poles of the outer ring permanent magnet 31 and the inner ring permanent magnet 41 are in opposite phases, and the magnetic field passes through the pole plates 60 to form a closed circuit. As a result, the magnetic field does not pass through the brake disc 10, no eddy currents are generated within the brake disc 10, and furthermore, no braking force is generated in the brake disc 10.

[0031] During the braking process, the power drive unit (e.g., motor) rotates the inner ring permanent magnet body 41, causing the magnetic poles of the outer ring permanent magnet body 31 and the inner ring permanent magnet body 31 to align in phase. The magnetic field passes through the electrode plates 60, forming a closed circuit within the brake disc 10. At this time, a magnetic field exists within the brake disc 10, and as the brake disc 10 rotates, eddy currents are generated, further producing a braking force, which is 100%.

[0032] In the states shown in Figures 3 and 4, the braking force is 0%, and in the states shown in Figures 5 and 6, the braking force is 100%. The inner ring permanent magnet body 41 rotates continuously, and theoretically, the braking force can be continuously increased or decreased, achieving stepless adjustment, that is, the brake can be adjusted within the range of 0% to 100%.

[0033] Referring again to Figure 7, Figure 7 is a schematic diagram of the structure of a disc-shaped permanent magnet eddy current brake device provided by an embodiment of the present invention.

[0034] In a specific embodiment, the disc-shaped permanent magnet eddy current brake device provided by the present invention mainly consists of parts such as a brake disc 10, an axle 70, and the permanent magnet eddy current brake device itself. The brake disc 10 is attached to the axle 70, the permanent magnet eddy current brake device is located on one side of the brake disc 10, and the permanent magnet eddy current brake device is provided with an outer ring permanent magnet unit 30 and an inner ring permanent magnet unit 40.

[0035] The outer ring permanent magnet unit 30 and the inner ring permanent magnet unit 40 are mounted inside the support casing 80, which is connected to the frame by a connecting rod and rotatably engaged with the axle 70 by a bearing 90, thereby keeping the support casing 80 relatively stationary when the vehicle is in motion.

[0036] Specifically, the outer ring permanent magnet unit 30 and the inner ring permanent magnet unit 40 are mounted inside the support casing 80 by two parallel first mounting disks 110 and second mounting disks 120, with outer ring fixing bases 32 provided on the first mounting disks 110 and second mounting disks 120, the outer ring permanent magnet body 31 and outer ring magnetic yoke 33 of the outer ring permanent magnet unit 30 being located inside the outer ring fixing bases 32, the inner ring permanent magnet body 41 and inner ring magnetic yoke 43 of the inner ring permanent magnet unit 40 being located in the slots of the inner ring rotating disk 42, and the inner ring rotating disk 42 being rotatable relative to the first mounting disks 110 and second mounting disks 120.

[0037] The inner ring rotating disk 42 has a cross-sectional shape similar to that of the outer ring fixing base 32, but the difference is that the outer ring fixing base 32 consists of several individual parts distributed in the circumferential direction, whereas the inner ring rotating disk 42 is a single, integrated part that can rotate in the circumferential direction.

[0038] The magnetic poles of both the outer ring permanent magnet 31 and the inner ring permanent magnet 41 are perpendicular to the disc surface of the brake disc 10. Rare earth permanent magnets such as Nd-Fe-B, which have high magnetic energy product and high magnetic coercivity, may be selected, and a strong magnetic field can be continuously generated without electric current excitation.

[0039] An outer ring magnetic yoke 33 and an inner ring magnetic yoke 43 are provided at one end of the outer ring permanent magnet body 31 and the inner ring permanent magnet body 41 that face the brake disc, respectively. The outer ring magnetic yoke 33 and the inner ring magnetic yoke 43 do not generate a magnetic field themselves, but simply act as a transmission and constraint of magnetic field lines in the magnetic circuit, preventing magnetic field lines from leaking to the outside, concentrating the magnetic field lines, and improving the efficiency of the mechanism.

[0040] In this embodiment, there are a total of 12 sets of outer ring permanent magnets 31 and outer ring magnetic yokes 33, which are arranged within 12 outer ring fixing bases 32 and uniformly aligned at 30° intervals along the circumferential direction. The outer ring fixing bases 32 are fixed inside the support casing 80 by first mounting disks 110 and second mounting disks 120. There are a total of 12 sets of inner ring permanent magnets 41 and inner ring magnetic yokes 43, which are arranged within 12 slots of the inner ring rotating disk 42 and uniformly aligned at 30° intervals along the circumferential direction.

[0041] Of course, the inner ring permanent magnet body 41 and the inner ring magnetic yoke 42 may be mounted inside the support casing 80 by a third mounting disk and a fourth mounting disk, which are arranged separately.

[0042] The electrode plates 60 correspond to the outer ring permanent magnet body 31 and the inner ring permanent magnet body 41, and their phase is the same as that of the outer ring permanent magnet body 31. There are a total of 12 sets, uniformly arranged at 30° intervals along the circumference. The electrode plates 60 are fixed to the side of the support casing 80 adjacent to the brake disc 10, maintaining a small gap with the brake disc 10. The electrode plates 60 are manufactured from a material with good magnetic conductivity, thereby effectively transmitting magnetic field lines.

[0043] A pre-compressed spring 50 is provided at one end of the outer ring permanent magnet body 31 and the inner ring permanent magnet body 41 that is away from the brake disc 10. This spring maintains sufficient contact between the outer ring permanent magnet body 31 and the inner ring permanent magnet body 41 and the corresponding magnetic yoke and pole plate 60 through elasticity. After secure mounting, the outer ring magnetic yoke 33 and the outer ring fixing base 32 are positioned by a positioning pin 150, fixing the position of the outer ring magnetic yoke 33.

[0044] A drive motor 130 is provided inside the support casing 80, and a ring gear is provided on the inner ring rotating disc 42. The drive motor engages with the ring gear via a gear 140 and transmits power, driving the inner ring rotating disc 42 to rotate, thereby changing the phase of the inner ring permanent magnet body 41 and achieving control of the braking force.

[0045] Referring to Figures 8 and 9, Figure 8 is a schematic diagram of the magnetic pole distribution when the disc-shaped permanent magnet eddy current brake device shown in Figure 7 is in the braking state, and Figure 9 is a schematic diagram of the magnetic pole distribution when the disc-shaped permanent magnet eddy current brake device shown in Figure 7 is in the motion state.

[0046] In the braking state, the motor 130 drives the inner ring rotating disc 42 to rotate, and when the magnetic poles of the inner ring permanent magnet body 41 and the outer ring permanent magnet body 31, which are in the same phase, coincide, the magnetic field passes through the electrode plate 60 and forms a closed circuit inside the brake disc 10, thereby generating a magnetic field. As the brake disc 10 rotates, eddy currents are generated inside the brake disc 10, further generating a braking force.

[0047] Under normal driving conditions, the motor 130 is driven again to rotate the inner ring rotating disc 42, reversing the magnetic poles of the in-phase inner ring permanent magnet body 41 and the outer ring permanent magnet body 31. The magnetic field also passes through the electrode plate 60 to form a closed circuit, the magnetic field does not pass through the brake disc 10, and the braking force is reduced to zero.

[0048] The above embodiments are merely preferred solutions of the present invention and are not limited thereto. Based on these, different embodiments can be obtained by appropriately adjusting them according to actual needs. For example, the outer ring permanent magnet unit 30 and the inner ring permanent magnet unit 40 may be mounted inside the support casing 80 in other forms, or they may be driven to rotate the inner ring rotating disk 42 in other forms. There are many possible realizations, so they are not described individually here.

[0049] This disc-shaped permanent magnet eddy current brake device generates and transmits a magnetic field through a combination of permanent magnets, magnetic yokes, and electrode plates. The outer permanent magnet body 31 is fixed, while the inner permanent magnet body 41 rotates driven by the motor 130. Furthermore, it controls the generation and stopping of braking force. The permanent magnets generate a magnetic field, eliminating the need for excitation coils, resulting in a lighter and more compact brake device. Moreover, as a rotary eddy current brake system, it avoids the impact on the railway that linear eddy current brakes have, and unlike air brakes, it does not have a longitudinal impact.

[0050] In addition to the disc-shaped permanent magnet eddy current brake device described above, the present invention further provides a railway vehicle comprising a body, frame, and brake device, wherein the brake device is the disc-shaped permanent magnet eddy current brake device described above, and other structures of the railway vehicle can be described by prior art and are not elaborated upon herein.

[0051] The above describes in detail the disc-shaped permanent magnet eddy current brake device provided by the present invention. The principles and embodiments of the present invention will be explained using specific examples in this specification, and the above description of embodiments is used solely for the purpose of understanding the spirit of the present invention. Hereinafter, those skilled in the art may make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. [Explanation of Symbols]

[0052] 10. Brake discs; 20...eddy current; 30 ···Outer ring permanent magnet unit; 31 ···Outer ring permanent magnet body; 32 ···Outer ring mounting base; 33. Outer ring magnetic yoke; 40 ···Inner ring permanent magnet unit; 41...Inner ring permanent magnet body; 42 ···Inner ring rotating disc; 43. Inner ring magnetic yoke; 50...spring; 60...Pole plate; 70... axle; 80 ···Support casing; 90 ···bearing; 110 ···First mounting disc; 120 ···Second mounting disc; 130 ···Drive motor; 140...gear; 150...Positioning pins.

Claims

1. A disc-shaped permanent magnet eddy current brake device comprising an axle (70), a brake disc (10) attached to the axle (70), and a permanent magnet eddy current brake device located on one side of the brake disc (10), wherein the permanent magnet eddy current brake device comprises an outer ring permanent magnet unit (30) and an inner ring permanent magnet unit (40), the outer ring permanent magnet unit (30) comprises a plurality of sets of outer ring permanent magnet bodies (31) uniformly distributed along the circumferential direction, the S poles and N poles of the outer ring permanent magnet bodies (31) are arranged alternately in sequence, the inner ring permanent magnet unit (40) comprises a plurality of sets of inner ring permanent magnet bodies (41) uniformly distributed along the circumferential direction, the S poles and N poles of the inner ring permanent magnet bodies (41) are arranged alternately in sequence, and the inner ring permanent magnet unit (40) is rotatable relative to the outer ring permanent magnet unit (30) to control the braking force by changing the phase of the inner ring permanent magnet bodies (41).

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

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

4. The disc-shaped permanent magnet eddy current brake device according to claim 3, further comprising electrode plates (60) corresponding to the outer ring permanent magnet body (31) and the inner ring permanent magnet body (41), wherein the phases of the electrode plates (60) and the outer ring permanent magnet body (31) are the same.

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 body (31) and the inner ring permanent magnet body (41) away from the brake disc (10), thereby maintaining sufficient contact between the outer ring permanent magnet body (31) and the inner ring permanent magnet body (41) and the corresponding magnetic yoke and electrode plate (60) by elasticity.

6. The disc-shaped permanent magnet eddy current brake device according to claim 5, characterized in that the outer ring permanent magnet unit (30) and the inner ring permanent magnet unit (40) are mounted inside a support casing (80), the support casing (80) is connected to a frame by a connecting rod and is rotatably engaged with the axle (70) by 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 unit (30) and the inner ring permanent magnet unit (40) are mounted inside the support casing (80) by two parallel mounting discs, the mounting discs are provided with several outer ring fixing bases (32), the outer ring permanent magnet body (31) and magnetic yoke are located inside the outer ring fixing bases (32), the inner ring permanent magnet body (41) and magnetic yoke are located in slots of the inner ring rotating disc (42), and the inner ring rotating disc (42) is rotatable relative to the mounting discs.

8. The disc-shaped permanent magnet eddy current brake device according to claim 7, characterized in that the electrode plate (60) is fixed to the support casing (80) on the side 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 drive motor (130) is provided inside the support casing (80), a ring gear is provided on the inner ring rotating disc (42), and the drive motor (130) drives the inner ring rotating disc (42) to rotate by meshing with the ring gear via a gear (140) and transmitting power.

10. A railway vehicle comprising a body, a frame, and a braking system, wherein the braking system is a disc-shaped permanent magnet eddy current brake system as described in any one of claims 1 to 9 above.

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