Non-contact linear drive device for maglev train

Abstract

The application provides a kind of maglev train non-contact linear drive device, relating to the technical field of suspended train, including rotor, rotor is suitable for rotationally connected with car body, rotor includes permanent magnet;Stator is suitable for fixedly connected with car body, stator is set to the side of rotor away from car body and forms first air gap with rotor, stator includes energized coil, the projection of stator in vertical direction overlaps at least a part of rotor;Conductor plate is laid along the track extension direction and forms second air gap with rotor, the projection of conductor plate in vertical direction overlaps at least another part of rotor.The application realizes force transmission by magnetic field effect, without physical contact, reduces wear and failure rate, and its permanent magnet excitation, compared with linear induction motor, significantly improves the power factor of driving device, reduces energy consumption, compared with linear synchronous motor, it only needs to lay passive conductor plate on the track, reduces the construction cost.

Description

Technical Field

[0001] This invention relates to the field of levitation train technology, and more specifically, to a non-contact linear drive device for maglev trains. Background Technology

[0002] Non-contact linear drive devices are the core components of the traction system of maglev trains, mainly consisting of two types: linear induction motors and linear synchronous motors.

[0003] A linear induction motor is a motor formed by extending a traditional rotary induction motor along a straight line. Its primary section typically consists of three-phase symmetrical windings. When a three-phase alternating current is applied, a traveling wave magnetic field is generated in the air gap. This magnetic field interacts with the secondary conductor plates (usually aluminum or copper plates with an iron backing), inducing eddy currents in the conductors. This generates electromagnetic thrust and normal force, enabling traction and levitation assistance for trains. Linear induction motors have the advantages of simple structure and no need for permanent magnets, but they have a lower power factor, limited efficiency, and require long secondary conductor plates and contact power supply. They are generally suitable for medium- and low-speed maglev transportation.

[0004] Linear synchronous motors are also derived from rotary synchronous motors along a straight line. Their stator is typically laid along the entire length of the track. When three-phase current is applied to the windings, a traveling wave magnetic field is generated in the air gap. This magnetic field synchronizes with the magnetic field of the permanent magnets or electrically excited coils in the rotor, thus generating traction force. Linear synchronous motors have advantages such as high power factor, high efficiency, and high thrust density, making them suitable for high-speed, long-distance operation. However, they require continuous stator windings along the entire line, resulting in high cost and complex structure, which is a major bottleneck limiting the widespread application of high-speed maglev. Summary of the Invention

[0005] The purpose of this invention is to provide a non-contact linear drive device for maglev trains to improve the aforementioned problems. To achieve this objective, the technical solution adopted by this invention is as follows:

[0006] This application provides a non-contact linear drive device for a maglev train, comprising: a rotor adapted to be rotatably connected to a vehicle body, the rotor including a permanent magnet; a stator adapted to be fixedly connected to the vehicle body, the stator being disposed on the side of the rotor away from the vehicle body and forming a first air gap between the stator and the rotor, the stator including an energized coil, the projection of the stator in the vertical direction overlapping at least a portion of the rotor, the stator being adapted to drive the rotor to rotate; and a conductor plate laid along the track extension direction and forming a second air gap between the conductor plate and the rotor, the projection of the conductor plate in the vertical direction overlapping at least another portion of the rotor.

[0007] According to some embodiments of the present invention, the rotor includes a first back iron, which is rotatably connected to the vehicle body. A plurality of permanent magnets are disposed on the first back iron, and the plurality of permanent magnets are distributed at intervals along the circumference of the first back iron.

[0008] According to some embodiments of the present invention, the magnetization direction of the permanent magnet is parallel to the vertical direction, and the magnetization directions of any two adjacent permanent magnets are opposite.

[0009] According to some embodiments of the present invention, the rotor further includes a bearing, the inner ring of which is fixedly connected to the vehicle body, and the outer ring of which is fixedly connected to a first back iron.

[0010] According to some embodiments of the present invention, the stator includes a second back iron, the second back iron is fixedly connected to the vehicle body, and the energized coil is disposed on the second back iron.

[0011] According to some embodiments of the present invention, a plurality of permanent magnets are disposed on the side of the first back iron away from the vehicle body, and the energized coil is disposed on the side of the second back iron facing the first back iron.

[0012] According to some embodiments of the present invention, the conductor plate is disposed on the side of the rotor away from the vehicle body.

[0013] According to some embodiments of the present invention, the energized coil is constructed as a three-phase coil winding.

[0014] According to some embodiments of the present invention, the first back iron and / or the second back iron are made of a good magnetic material, and the conductor plate is made of a good conductor material.

[0015] According to some embodiments of the present invention, the rotor is constructed as two rotors, which are arranged vertically at intervals and are rotatably connected to the vehicle body respectively. The conductor plate and the stator are both disposed between the two rotors. The stator includes two energized coils, which correspond to the two rotors respectively.

[0016] The beneficial effects of this invention are as follows:

[0017] The non-contact linear drive device for maglev trains of the present invention transmits force through the action of a magnetic field, eliminating the need for physical contact, reducing wear and failure rate, and improving the reliability and lifespan of the system. Moreover, the use of permanent magnet excitation significantly improves the power factor of the drive device and reduces energy consumption compared to linear induction motors. Compared to linear synchronous motors, this solution only requires laying passive conductor plates on the track, reducing construction costs.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the non-contact linear drive device for maglev trains according to the present invention.

[0021] Figure 2 This is a side view of the non-contact linear drive device for maglev trains according to the present invention;

[0022] Figure 3 This is a schematic diagram of the rotor structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the stator structure of the present invention;

[0024] Figure 5 A schematic diagram of a non-contact linear drive device for maglev trains according to the present invention, which has two rotors;

[0025] Figure 6 This is a cross-sectional view of the conductor plate, stator, and two rotors of the present invention.

[0026] Figure 7 This is a schematic diagram showing two energized coils configured in the stator of the present invention.

[0027] Marked in the image:

[0028] 10. Rotor; 11. Permanent magnet; 12. First back iron; 13. Bearing; 20. Stator; 21. Energized coil; 22. Second back iron; 30. Conductor plate. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] like Figures 1-7 As shown, this embodiment provides a non-contact linear drive device for a maglev train, including: a rotor 10, a stator 20, and a conductor plate 30. The rotor 10 is adapted to be rotatably connected to the vehicle body and includes a permanent magnet 11. The stator 20 is adapted to be fixedly connected to the vehicle body and is disposed on the side of the rotor 10 away from the vehicle body, forming a first air gap with the rotor 10. The stator 20 includes an energized coil 21. The projection of the stator 20 in the vertical direction overlaps with at least a portion of the rotor 10. The stator 20 is adapted to drive the rotor 10 to rotate. The conductor plate 30 is laid along the track extension direction and forms a second air gap with the rotor 10. The projection of the conductor plate 30 in the vertical direction overlaps with at least another portion of the rotor 10.

[0032] In some embodiments, the rotor 10 is rotatably connected to the vehicle body. The rotor 10 includes a permanent magnet 11 adapted to provide a constant magnetic field. The stator 20 is fixedly connected to the vehicle body to ensure that the stator 20 remains stationary during driving. The stator 20 is disposed on the side of the rotor 10 away from the vehicle body and a first air gap is formed between the stator 20 and the rotor 10. The stator 20 includes an energized coil 21. When current is passed through the energized coil 21, a traveling wave magnetic field is generated. The projection of the stator 20 in the vertical direction overlaps with at least a portion of the rotor 10 to ensure that the traveling wave magnetic field can effectively act on the permanent magnet 11 on the rotor 10, thereby driving the rotor 10 to rotate. The conductor plate 30 is laid along the track extension direction. The projection of the conductor plate 30 in the vertical direction overlaps with at least another portion of the rotor 10 so that the rotating magnetic field generated when the rotor 10 rotates can effectively act on the conductor plate 30. A second air gap is formed between the conductor plate 30 and the rotor 10.

[0033] It is understandable that when a three-phase alternating current is applied to the energized coil 21 in the stator 20, a traveling wave magnetic field is generated. The traveling wave magnetic field acts on the permanent magnet 11 on the rotor 10 through the first air gap to drive the rotor 10 to rotate. When the rotor 10 rotates, the permanent magnet 11 on the rotor 10 generates a rotating magnetic field. The rotating magnetic field acts on the conductor plate 30 through the second air gap. The conductor plate 30 generates eddy currents under the action of the rotating magnetic field. The eddy currents interact with the rotating magnetic field to generate a driving force, realizing the non-contact transmission of force, thereby driving the maglev train forward.

[0034] It is worth mentioning that when there is slippage between the conductor plate 30 and the rotor 10 during braking, the rotor 10 will rotate under the action of the conductor plate 30 (the slippage causes the rotor 10 to rotate under the action of the eddy current generated by the conductor plate 30). The rotating rotor 10 generates a rotating magnetic field that cuts the energized coil 21 to generate induced electromotive force and induced current. After transformation and control, the induced current can realize energy recovery or braking consumption, thereby completing the regenerative braking function.

[0035] It should be noted that in the event of electrical equipment failure or emergency, the rotation of rotor 10 can be restricted by mechanical limit device, so that relative motion is formed between rotor 10 and conductor plate 30, generating eddy current braking, which enhances the safety of the system.

[0036] Compared with linear induction motors, the advantages of the non-contact linear drive device for maglev trains in this application are:

[0037] 1. Linear induction motors require energized coils for excitation, resulting in a low power factor. In contrast, the non-contact linear drive device for maglev trains in this application employs permanent magnet excitation technology, significantly improving the power factor of the drive device.

[0038] 2. Linear induction motors have difficulty achieving regenerative braking. However, this invention can achieve regenerative braking without current excitation, which can significantly improve the overall driving efficiency of maglev trains.

[0039] 3. Linear induction motors cannot achieve emergency braking in the event of electrical equipment failure. This invention, in the event of electrical equipment failure or emergency, can restrict the rotation of the rotor 10 through a mechanical limiting device, causing relative motion between the rotor 10 and the conductor plate 30, thus generating eddy current braking.

[0040] Compared with linear synchronous motors, the advantages of the non-contact linear drive device for maglev trains in this application are:

[0041] 1. Linear synchronous motors require the installation of three-phase coils on the track and the deployment of corresponding substations, resulting in high construction costs. This application only requires the installation of an uninsulated conductor plate 30 on the track, significantly reducing costs.

[0042] 2. Linear synchronous motors cannot achieve emergency braking in the event of electrical equipment failure. This invention, in the event of electrical equipment failure or emergency, can restrict the rotation of the rotor 10 through a mechanical limiting device, causing relative motion between the rotor 10 and the conductor plate 30, thus generating eddy current braking.

[0043] It is worth mentioning that the rotor 10 and the conductor plate 30 of this application are spaced apart from each other in the thickness direction, and the projection of the conductor plate 30 in the vertical direction overlaps with at least another part of the rotor 10. As a result, the cutting coupling area of ​​the magnetic field of the conductor plate 30 and the permanent magnet 11 on the rotor 10 is large, which improves the magnetic field utilization rate of the permanent magnet 11 on the rotor 10, thereby improving the driving force density and thus making the driving performance of the train better.

[0044] Furthermore, in this application, the rotor 10 and stator 20 are respectively connected to the vehicle body, and the rotor 10 is directly driven to rotate through the stator 20. This simplifies the structure and reduces the space occupied by the non-contact linear drive device for maglev trains, thereby reducing the size of the device, facilitating its installation on the vehicle body, and improving the train's integration. Of course, the rotor 10 is directly driven to rotate through the stator 20, and its rotation directly engages with the conductor plate 30 to drive the train. This eliminates the intermediate drive structure, shortens the transmission chain, improves drive efficiency, and further enhances the train's driving performance.

[0045] According to some embodiments of the present invention, the rotor 10 includes a first back iron 12, which is rotatably connected to the vehicle body. A plurality of permanent magnets 11 are disposed on the first back iron 12, and the plurality of permanent magnets 11 are distributed at intervals along the circumference of the first back iron 12.

[0046] In some embodiments, the first back iron 12 is rotatably connected to the vehicle body, and a plurality of permanent magnets 11 are provided on the first back iron 12. The arrangement of the plurality of permanent magnets 11 can enhance the magnetic field strength generated by the rotor 10 and improve the performance of the drive device. Moreover, the plurality of permanent magnets 11 are distributed circumferentially along the first back iron 12, so that the magnetic field generated by the permanent magnets 11 forms a relatively uniform and orderly magnetic field distribution around the rotor 10, which is conducive to effective interaction with the traveling wave magnetic field generated by the stator 20, thereby achieving more efficient drive of the rotor 10, while also ensuring the stability and reliability of the drive process.

[0047] It is understandable that multiple permanent magnets 11 on the first back iron 12 are distributed circumferentially, and each permanent magnet 11 has its own magnetic field. When multiple permanent magnets 11 are arranged in a specific way, the magnetic fields generated by the multiple permanent magnets 11 are superimposed on each other, forming a composite magnetic field with a certain intensity and direction around the rotor 10. The composite magnetic field is suitable for interacting with the magnetic field of the stator 20 to drive the rotor 10 to rotate.

[0048] Specifically, after the three-phase alternating current is applied to the energized coil 21 in the stator 20, a traveling wave magnetic field is generated. The traveling wave magnetic field acts on the composite magnetic field generated by the permanent magnet 11 on the rotor 10 through the first air gap. Due to the interaction force between the magnetic fields, the traveling wave magnetic field will try to drive the composite magnetic field of the rotor 10 to move together, thereby driving the rotor 10 to rotate around the rotation connection point with the vehicle body. During the rotation of the rotor 10, the permanent magnet 11 on it continuously generates a rotating magnetic field. The rotating magnetic field acts on the conductor plate 30 through the second air gap, causing the conductor plate 30 to generate eddy currents. The eddy currents and the rotating magnetic field interact to generate a driving force to drive the maglev train forward.

[0049] According to some embodiments of the present invention, the magnetization direction of the permanent magnet 11 is parallel to the vertical direction, and the magnetization directions of any two adjacent permanent magnets 11 are opposite.

[0050] In some embodiments, the vertical direction is parallel to the height direction of the vehicle body, and the magnetization directions of any two adjacent permanent magnets 11 are opposite. That is, if the magnetization direction of one permanent magnet 11 is vertically upward, then the magnetization direction of the adjacent permanent magnet 11 is vertically downward, and vice versa.

[0051] It is understandable that when multiple permanent magnets 11 are arranged on the first back iron 12 with their magnetization direction parallel to the vertical direction and adjacent magnetization directions opposite, each permanent magnet 11 will generate a vertical magnetic field. Since adjacent permanent magnets 11 have opposite magnetization directions, the magnetic fields they generate will superimpose and influence each other in space. Around the rotor 10, this superposition will form a periodically changing magnetic field distribution.

[0052] When a three-phase alternating current is passed through the energized coil 21 in the stator 20, a traveling wave magnetic field is generated. The periodically changing magnetic field formed by the permanent magnet 11 on the rotor 10 will interact with the traveling wave magnetic field of the stator 20. According to the basic principle of magnetic field interaction, when the direction and intensity of the magnetic field lines of the two magnetic fields meet certain conditions, a force will be generated. This force will try to make the magnetic field of the rotor 10 move together with the traveling wave magnetic field of the stator 20, thereby driving the rotor 10 to rotate around the rotational connection point with the vehicle body.

[0053] It should be noted that the arrangement of adjacent permanent magnets 11 with opposite magnetization directions makes the magnetic field changes around the rotor 10 more varied and regular. This magnetic field distribution can better couple with the traveling wave magnetic field generated by the stator 20, improving the interaction efficiency between the magnetic fields. Compared with other magnetization methods, this arrangement allows the rotor 10 to generate a larger rotational torque under the action of a smaller stator 20 magnetic field, thereby enhancing the driving force of the drive device.

[0054] Moreover, the magnetic fields of adjacent permanent magnets 11 complement and balance each other, reducing vibration and impact caused by uneven magnetic fields. This helps the maglev train maintain stability during operation, improves passenger comfort, and also reduces wear and malfunctions of the drive unit caused by vibration, extending the service life of the drive unit.

[0055] According to some embodiments of the present invention, the rotor 10 further includes a bearing 13, the inner ring of which is fixedly connected to the vehicle body, and the outer ring of which is fixedly connected to the first back iron 12. It is understood that rolling elements (such as balls or rollers) exist inside the bearing 13. These rolling elements roll between the inner and outer rings, transforming the original sliding friction into rolling friction. The resistance of rolling friction is much smaller than that of sliding friction, reducing the frictional force when the rotor 10 rotates, allowing the rotor 10 to rotate more easily, reducing energy loss, and improving the efficiency of the drive device.

[0056] According to some embodiments of the present invention, the stator 20 includes a second back iron 22, which is fixedly connected to the vehicle body, and an energized coil 21 is provided on the second back iron 22.

[0057] Understandably, when three-phase alternating current is applied to the energized coil 21 located on the second back iron 22, according to Ampere's law (right-hand screw law), each coil will generate a magnetic field in a specific direction around it. Since it is three-phase alternating current, the magnetic fields generated by the three coils will superimpose and influence each other, eventually forming a traveling wave magnetic field around the stator 20. The second back iron 22 is made of a high permeability material and has good magnetic permeability. The second back iron 22 can effectively conduct and concentrate the magnetic field generated by the energized coil 21, so that the magnetic field forms a more concentrated and orderly distribution around the stator 20. This concentrated and orderly magnetic field distribution can improve the interaction efficiency between the magnetic field and the magnetic field of the permanent magnet 11 of the rotor 10 and enhance the driving force of the drive device.

[0058] The traveling wave magnetic field generated by the stator 20 acts on the magnetic field of the permanent magnet 11 on the rotor 10 through the first air gap. Since the magnetization directions of adjacent permanent magnets 11 are opposite, a periodically changing magnetic field is formed around the rotor 10. When the traveling wave magnetic field of the stator 20 meets the periodic magnetic field of the rotor 10, a tangential force is generated according to the basic principle of magnetic field interaction. This force causes the magnetic field of the rotor 10 to move together with the traveling wave magnetic field of the stator 20, thereby driving the rotor 10 to rotate around the bearing 13.

[0059] According to some embodiments of the present invention, a plurality of permanent magnets 11 are disposed on the side of the first back iron 12 away from the vehicle body, and an energized coil 21 is disposed on the side of the second back iron 22 facing the first back iron 12.

[0060] Understandably, the permanent magnet 11 is positioned on the side of the first back iron 12 away from the vehicle body, and the energized coil 21 is positioned on the side of the second back iron 22 facing the first back iron 12. This minimizes the distance between the two magnetic field sources (the magnetic field of the permanent magnet 11 and the magnetic field generated by the energized coil 21) and maximizes their facing area. This makes the interaction between the magnetic fields more direct and efficient, allowing more magnetic field energy to be converted into mechanical energy. It also reduces energy loss during transmission and conversion, thereby improving the efficiency of the drive device and enabling the maglev train to obtain greater driving force with less energy consumption.

[0061] According to some embodiments of the present invention, the conductor plate 30 is disposed on the side of the rotor 10 away from the vehicle body, which can make fuller use of the traveling wave magnetic field generated by the stator 20. The Lorentz force generated by the induced current in the conductor plate 30 can provide an additional driving force, which works in conjunction with the driving force on the rotor 10, thereby enhancing the driving capability of the drive device, enabling the maglev train to obtain greater acceleration and traction, and improving the train's operating performance.

[0062] According to some embodiments of the present invention, the energized coil 21 is constructed as a three-phase coil winding.

[0063] In some embodiments, when three-phase alternating current is applied to the three-phase coil windings, due to the 120° phase difference in time between the three-phase currents, according to Ampere's law (right-hand screw law), each winding will generate a pulsating magnetic field around itself. The three pulsating magnetic fields are superimposed in space to form a rotating magnetic field that rotates along the inner circumference of the stator 20. The permanent magnet 11 on the rotor 10 generates a fixed magnetic field. When the rotating magnetic field of the stator 20 meets the magnetic field of the permanent magnet 11 of the rotor 10, a tangential force is generated according to the basic principle of magnetic field interaction. This tangential force causes the magnetic field of the rotor 10 to rotate along with the rotating magnetic field of the stator 20, thereby driving the rotor 10 to rotate.

[0064] According to some embodiments of the present invention, the first back iron 12 and / or the second back iron 22 are made of a good magnetic material, and the conductor plate 30 is made of a good conductor material.

[0065] In some embodiments, the first back iron 12 may be made of a good magnetic material; the second back iron 22 may be made of a good magnetic material; or the first back iron 12 may be made of a good magnetic material and the second back iron 22 may be made of a good magnetic material, without limitation.

[0066] Understandably, in the non-contact linear drive device of the maglev train, the permanent magnet 11 generates a magnetic field, and the energized coil 21 also generates a magnetic field after being energized. The first back iron 12 and the second back iron 22, made of a good magnetic conductive material, can provide a low magnetic resistance path for these magnetic fields, making it easier for the magnetic fields to be conducted and concentrated in the first back iron 12 and the second back iron 22. In addition, the first back iron 12 and the second back iron 22, made of a good magnetic conductive material, will reduce the large amount of leakage of the magnetic field in the surrounding space.

[0067] Therefore, by concentrating and guiding the magnetic field and reducing magnetic leakage, more magnetic field energy can be applied to the interaction area between the rotor 10 and the stator 20, thereby increasing the electromagnetic force, improving the driving capability of the drive device, and enabling the maglev train to obtain greater traction and acceleration.

[0068] In other embodiments, the conductor plate 30, made of a good conductor material, can generate a large induced current and be subjected to a strong Lorentz force, thereby more effectively converting magnetic field energy into mechanical energy, improving the efficiency of energy conversion, and enabling the maglev train to obtain a larger mechanical energy output with less electrical energy input.

[0069] In some other embodiments, the three-phase coil windings are made of a good conductor material. It is understood that a good conductor material has low resistivity and can more effectively generate an alternating magnetic field when an alternating current is passed through the three-phase coil windings. In the non-contact linear drive device of a maglev train, this enhanced magnetic field interacts with the magnetic field of the permanent magnet 11 on the rotor 10 to generate a greater electromagnetic force, thereby increasing the driving force of the drive device.

[0070] According to some embodiments of the present invention, there are two rotors 10, which are arranged at intervals in the vertical direction and are rotatably connected to the vehicle body respectively. The conductor plate 30 and the stator 20 are both arranged between the two rotors 10. The stator 20 includes two energized coils 21, which correspond to the two rotors 10 respectively.

[0071] In some embodiments, two rotors 10 are arranged vertically at intervals and are rotatably connected to the vehicle body. When the energized coils 21 of the stator 20 generate electromagnetic forces acting on the rotors 10, the electromagnetic forces acting on the two rotors 10 can be balanced in the vertical direction. For example, if one rotor 10 is subjected to an upward electromagnetic force, the other rotor 10 may be subjected to a downward electromagnetic force (depending on the current direction and magnetic field distribution). This balance helps maintain the vertical stability of the vehicle body and reduces vehicle body sway. Thus, the mechanical balance effect of the dual-rotor-dual-coil structure in the vertical direction, as well as the precise control of electromagnetic forces in the horizontal direction, makes the forces acting on the train more uniform and stable during operation, effectively reducing train vibration and bumps, and improving the smoothness of train operation and passenger comfort.

[0072] In other embodiments, a structure with two rotors 10 and two energized coils 21 is used, which is equivalent to adding a "power source" to the drive unit. Each rotor-coil pair can generate a certain electromagnetic force, and the combined action of the two rotor-coil pairs can provide a greater total driving force, enabling the maglev train to obtain stronger acceleration and traction capabilities.

[0073] Of course, placing the conductor plate 30 and stator 20 between the two rotors 10 makes the entire drive unit more compact, reduces its size, and facilitates installation and layout on maglev trains. Furthermore, because there are two independent rotor-coil pairs, if one energized coil 21 or rotor 10 fails, the other rotor-coil pair can still operate, providing a certain driving force to the train, enabling it to continue running or stop safely. This improves the reliability and safety of the drive unit and reduces the risk of train downtime due to single-point failures.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A non-contact linear drive device for maglev trains, characterized in that, include: Rotor (10), the rotor (10) being adapted to be rotatably connected to the vehicle body, the rotor (10) including permanent magnet (11). A stator (20) is adapted to be fixedly connected to the vehicle body. The stator (20) is disposed on the side of the rotor (10) away from the vehicle body and forms a first air gap with the rotor (10). The stator (20) includes an energized coil (21). The projection of the stator (20) in the vertical direction overlaps with at least a portion of the rotor (10). The stator (20) is adapted to drive the rotor (10) to rotate. Conductor plate (30), which is laid along the track extension direction and forms a second air gap with the rotor (10), the projection of the conductor plate (30) in the vertical direction overlaps with at least another part of the rotor (10); The rotor (10) is constructed as two, and the two rotors (10) are arranged at intervals in the vertical direction and are rotatably connected to the vehicle body respectively. The conductor plate (30) and the stator (20) are both arranged between the two rotors (10). The stator (20) includes two energized coils (21), and the two energized coils (21) correspond to the two rotors (10) respectively. The permanent magnets (11) are configured as a plurality of them spaced apart in the circumferential direction. The magnetization direction of the permanent magnets (11) is parallel to the vertical direction, and the magnetization directions of any two adjacent permanent magnets (11) are opposite.

2. The non-contact linear drive device for maglev trains according to claim 1, characterized in that, The rotor (10) includes a first back iron (12), which is rotatably connected to the vehicle body. A plurality of permanent magnets (11) are provided on the first back iron (12), and the plurality of permanent magnets (11) are distributed circumferentially along the first back iron (12).

3. The non-contact linear drive device for maglev trains according to claim 2, characterized in that, The rotor (10) also includes a bearing (13), the inner ring of which is fixedly connected to the vehicle body, and the outer ring of which is fixedly connected to the first back iron (12).

4. The non-contact linear drive device for maglev trains according to claim 2, characterized in that, The stator (20) includes a second back iron (22), which is fixedly connected to the vehicle body, and the energized coil (21) is provided on the second back iron (22).

5. The non-contact linear drive device for maglev trains according to claim 4, characterized in that, Multiple permanent magnets (11) are disposed on the side of the first back iron (12) away from the vehicle body, and the energized coil (21) is disposed on the side of the second back iron (22) facing the first back iron (12).

6. The non-contact linear drive device for maglev trains according to claim 5, characterized in that, The conductor plate (30) is disposed on the side of the rotor (10) away from the vehicle body.

7. The non-contact linear drive device for maglev trains according to claim 4, characterized in that, The energized coil (21) is constructed as a three-phase coil winding.

8. The non-contact linear drive device for maglev trains according to claim 4, characterized in that, The first back iron (12) and / or the second back iron (22) are made of a good magnetic material, and the conductor plate (30) is made of a good conductor material.

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