An electrically powered levitation device

Abstract

The application discloses an electric suspension device, which is characterized by adding a passive magnetic damping structure made of metal material in the electric suspension device. When the suspension air gap vibrates, the magnetic damping structure utilizes the air gap magnetic field change caused by the suspension air gap change to generate induced eddy current and damping force, which is beneficial to realize the rapid attenuation of the suspension air gap amplitude and achieve the purpose of suppressing the suspension air gap vibration. The electric suspension device mainly comprises a field source magnet and a reaction plate, and the field source magnet and the reaction plate can move at high speed relative to each other. The magnetic damping structure and the magnet of the electric suspension device are fixed together and move together with the magnet. The magnetic damping structure is mainly made of a non-magnetic and high-conductivity material. The magnetic damping structure can adopt a plate type structure or a coil type structure. The magnetic damping structure can significantly improve the damping coefficient of the electric suspension device for suppressing the air gap vibration and is beneficial to improve the stability of the electric suspension device in operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electrodynamic magnetic suspension, and particularly relates to an electrodynamic suspension device for improving suspension performance by improving vertical vibration damping. BACKGROUND

[0002] An electrodynamic suspension (EDS) device is mainly composed of a field source magnet and a metal reaction plate. When the field source magnet and the metal reaction plate move relative to each other, the field source magnet generates an alternating magnetic field on the metal reaction plate, the metal reaction plate induces eddy currents under the action of the alternating magnetic field, and the field source magnet and the metal reaction plate induce eddy currents that interact to generate electromagnetic repulsion. The electromagnetic repulsion is used to achieve the suspension of the field source magnet.

[0003] The field source magnet of the electrodynamic suspension device can generally be composed of a permanent magnet array arranged according to a certain rule and magnetized, or can be composed of a powered superconducting coil. The metal reaction plate can be a plate structure made of a good conductor material, or can be a coil structure wound according to a certain rule. The electrodynamic suspension device does not need to apply additional control when running. When the relative speed between the field source magnet and the reaction plate reaches a certain value, it can automatically take off. The running mode is simple, and it is particularly suitable for high-speed and super-high-speed ground propulsion fields. It has been successfully applied in the fields of rocket sleds and high-speed magnetic levitation trains. The electrodynamic suspension device has a small damping coefficient for air gap disturbance and poor damping effect for air gap disturbance, and belongs to a non-damped or under-damped system, which is not conducive to the stable operation of the electrodynamic suspension device.

[0004] Chinese invention patent CN201610563045.9 discloses a coil type permanent magnet electrodynamic suspension device for a magnetic levitation train. The field source magnet of the device adopts a double-sided Halbach permanent magnet array, and zero flux coils are arranged between the double-sided magnet arrays along the direction of the train running track. The suspension device uses the differential suspension force generated by the interaction of the double-sided permanent magnet array and the zero flux coils to improve the suspension stiffness of the suspension system and improve the suppression effect on the suspension gap vibration during train operation. However, the use of a coil type structure instead of a flat plate type reaction plate improves the suspension stiffness, but sacrifices the absolute value of the suspension force, reduces the float-to-weight ratio of the suspension system, and also increases the manufacturing cost and installation difficulty of the entire suspension track.

[0005] The Chinese invention patent CN202110677546.0 discloses a permanent magnet electric repulsion suspension system based on passive damping magnets. The suspension system is arranged with multiple groups of Halbach magnet arrays in the suspension direction and the guide direction of the vehicle body, respectively used to generate the required suspension force, guide force, suspension damping and guide damping. The suspension magnets and the suspension damping magnets are arranged vertically to each other in space, and the guide magnets and the guide damping magnets are arranged vertically to each other in space. The suspension system actually provides damping effect by using the magnetic resistance of the Halbach magnets when moving through the vertical arrangement of multiple groups of magnets. However, this method undoubtedly increases the weight of the suspension system and improves the complexity of the system. In addition, the setting method of multiple suspension and guide gaps also increases the difficulty of assembling the suspension system.

[0006] The Chinese utility model patent CN202023335247.9 discloses a damper and damping equipment for a superconducting electric suspension system. The device is additionally provided with a source damping coil, a control assembly and an inverter circuit on the suspended vehicle body. The current of the damping coil is actively controlled according to the change of the suspension gap, thereby actively suppressing the vibration of the suspension gap. However, this method of improving the damping performance of the suspension device needs to add additional control assembly and inverter circuit, and needs to collect the change of the suspension gap in real time with high precision, which increases the cost and complexity of the suspension system and reduces the reliability of the suspension system under high-speed conditions. SUMMARY

[0007] To solve the above problems, the present application provides an electric suspension device. The present application adds a passive magnetic damping structure made of non-magnetic metal material to the traditional electric suspension device. When the suspension air gap vibrates, eddy currents are induced by the change of the magnetic field caused by the change of the suspension air gap, thereby generating magnetic damping effect to suppress the vibration of the suspension air gap.

[0008] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0009] An electric suspension device, comprising a reaction plate, a magnet sleeve, a field source magnet and a magnetic damping structure. The magnet sleeve is made of non-magnetic metal material or non-metal material, and an open slot is formed in the magnet sleeve. The field source magnet is embedded and fixed in the open slot of the magnet sleeve and moves with the magnet sleeve. The magnetic damping structure is fixed on one side of the magnet sleeve facing the reaction plate and moves with the magnet sleeve and the field source magnet. The reaction plate is made of a plate structure or a coil structure of non-magnetic good conductor material. The field source magnet is composed of a permanent magnet array or an energized superconducting coil arranged in a certain way. The magnetic damping structure is made of non-magnetic, high electrical conductivity metal material. The magnet sleeve maintains a non-contact state with the reaction plate during movement.

[0010] Further, the magnetic damping structure is composed of a whole non-magnetic and high-conductivity metal plate, forming a flat plate type magnetic damping structure.

[0011] Further, the flat plate type magnetic damping structure is sprayed with high-conductivity metal powder outside the metal plate, forming a composite flat plate type magnetic damping structure.

[0012] Further, the flat plate type magnetic damping structure is composed of multiple non-magnetic and high-conductivity metal thin plates, each of which is made of the same metal material or different metal materials, forming a multi-layer composite flat plate type magnetic damping structure.

[0013] Further, the flat plate type magnetic damping structure is provided with rectangular air slots in a certain manner on the metal plate, forming a grid type magnetic damping structure.

[0014] Further, the flat plate type magnetic damping structure is provided with rectangular air slots in a certain manner on the metal plate, and non-magnetic and high-conductivity block materials are embedded in the slots, forming a composite grid type magnetic damping structure.

[0015] Beneficial effects:

[0016] The magnetic damping structure can significantly improve the vertical vibration damping of the electric suspension device to suppress the change of air gap, and is beneficial to improve the stability of the electric suspension device. The application uses the inherent electromagnetic effect of passive and non-magnetic metal structure to increase the vibration damping coefficient of the electric suspension device, and has the advantages of simple structure and reliable operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of the electric suspension device based on permanent magnet array;

[0018] Figure 2 Schematic diagram of the electric suspension device with silver-coated magnetic damping structure;

[0019] Figure 3 Schematic diagram of the electric suspension device with copper flat plate type magnetic damping structure;

[0020] Figure 4 Schematic diagram of the grid flat plate type magnetic damping structure;

[0021] Figure 5 Schematic diagram of the composite grid flat plate type magnetic damping structure;

[0022] Figure 6 Comparison results of three kinds of magnetic damping effects.

[0023] 1, reaction plate, 2, magnet sleeve, 3, field source magnet, 4, integrated magnetic damping structure, 5, silver-coated layer, 6, flat plate type magnetic damping structure, 7, grid type magnetic damping structure, 8, block material. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely in combination with specific examples. Limited by the length, the examples described below are only a part of the examples of the present application, but not all the examples. Based on the technical solutions in the examples of the present application, as long as there is no conflict, various combinations can be made. On this basis, all other examples obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0025] As shown in Figure 1 , the electric suspension device comprises a reaction plate 1, a magnet sleeve 2, a field source magnet 3 and a magnetic damping structure. The magnet sleeve 2 can be made of non-magnetic metal material or non-metal material, and an open slot is formed in the magnet sleeve 2. The field source magnet 3 is embedded and fixed in the open slot of the magnet sleeve 2 and moves together with the magnet sleeve 2. The magnetic damping structure is fixed on the side of the magnet sleeve 2 facing the reaction plate and moves together with the magnet sleeve 2 and the field source magnet 3. The reaction plate 1 is made of a plate structure or a coil structure of a non-magnetic good conductor material. The field source magnet 3 is composed of a permanent magnet array arranged in a certain way or an energized superconducting coil. The magnetic damping structure is made of a non-magnetic metal material with high electrical conductivity. The magnet sleeve 2 maintains a non-contact state with the reaction plate during movement. The magnetic damping structure is an integrated magnetic damping structure 4 which is designed in an integrated manner with the magnet sleeve 2. When the suspension air gap vibrates, eddy current will be induced on the integrated magnetic damping structure 4 of the magnet sleeve 2 moving together with the field source magnet 3, and damping force will be generated to rapidly attenuate the vibration amplitude of the suspension air gap.

[0026] As shown in Figure 2 , the magnet sleeve 2 is made of aluminum alloy material, and a silver-plated coating 5 constituting a magnetic damping structure is arranged on the lower part of the magnet sleeve 2 facing the reaction plate 1. Since the electrical conductivity of silver is higher than that of copper, aluminum and other conventional non-magnetic metal materials, the required coating thickness is smaller under the condition of achieving the same damping performance, which is conducive to reducing the electromagnetic suspension gap and improving the suspension performance.

[0027] As shown in Figure 3 , the magnet sleeve 2 adopts an open slot structure, and a copper flat plate constituting a flat plate magnetic damping structure 6 is arranged at the open slot of the magnet sleeve 2. The copper flat plate and the magnet sleeve 2 can be fixed together by means of gluing, welding or bolt connection. The magnet sleeve 2 and the flat plate magnetic damping structure 6 can be made of different metal materials, which is flexible in material selection and is conducive to the design and optimization of the magnetic damping structure and the sleeve under different requirements. Further, high-conductivity metal powder is sprayed on the outside of the copper flat plate to form a composite flat plate magnetic damping structure.

[0028] As Figure 4 shown, the damping structure is a grid format magnetic damping structure 7, which is composed of copper plate, and a series of rectangular slots are opened on the copper plate along the movement direction of field source magnet 3. The installation method of the grid format magnetic damping structure 7 is similar to that of the flat plate type magnetic damping structure 6, and is located on the side of the magnet sleeve 2 facing the reaction plate 1.

[0029] As Figure 5 shown, the composite grid format magnetic damping structure is composed of the grid format magnetic damping structure 7 and the silver block material 8, and the silver block material 8 is filled in the rectangular slots of the grid format magnetic damping structure 7. The installation method of the grid format magnetic damping structure 7 is similar to that of the flat plate type magnetic damping structure 6, and is located on the side of the magnet sleeve 2 facing the reaction plate 1. The grid format magnetic damping structure 7 and the block material 8 of the composite grid format magnetic damping structure can be selected from different metal materials, and the material selection is flexible, which is conducive to the design and optimization of the magnetic damping structure under the condition of meeting different requirements.

[0030] As Figure 6 shown, under the condition of using the same permanent magnetic field source magnet and reaction plate and the same vertical initial speed, Figure 1 , Figure 2 and Figure 5 shown, the magnetic damping effect comparison of the three kinds of magnetic damping structures, from the change of the vertical speed in the figure, it can be seen that by increasing the magnetic damping structure proposed in the application, the vertical damping effect of the electric suspension device is significantly improved.

[0031] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electrically powered levitation device, characterized in that: The system includes a reaction plate, a magnetic sleeve, a source magnet, and a magnetic damping structure. The magnetic sleeve is made of a non-magnetic metallic or non-metallic material and has an opening slot. The source magnet is embedded and fixed in the opening slot and moves with the magnetic sleeve. The magnetic damping structure is fixed on the side of the magnetic sleeve facing the reaction plate and moves with both the magnetic sleeve and the source magnet. The reaction plate is a plate structure or a coil structure made of a non-magnetic, highly conductive material. The source magnet consists of a permanent magnet array or an energized superconducting coil arranged in a specific manner. The magnetic damping structure is made of a non-magnetic, high-conductivity metallic material. The magnetic sleeve remains in non-contact with the reaction plate during movement. The magnetic damping structure is composed of a single non-magnetic, high-conductivity metal plate, forming a plate-type magnetic damping structure. The aforementioned planar magnetic damping structure is formed by spraying high-conductivity metal powder onto the outside of a metal plate to create a composite planar magnetic damping structure.

2. The electric levitation device according to claim 1, characterized in that: The aforementioned planar magnetic damping structure is composed of multiple non-magnetic, high-conductivity thin metal plates. Each thin metal plate is made of the same metal material or different metal materials, forming a multi-layer composite planar magnetic damping structure.

3. The electric levitation device according to claim 1, characterized in that: The metal plate of the aforementioned flat magnetic damping structure has rectangular slots opened in a certain way to form a grid-type magnetic damping structure.

4. The electric levitation device according to claim 1, characterized in that: The metal plate of the aforementioned planar magnetic damping structure has rectangular slots opened in a certain way, and non-magnetic, high-conductivity block material is embedded in the slots to form a composite grid-type magnetic damping structure.

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