A magnetic levitation bogie structure driven by a rotary motor

Abstract

The application discloses a magnetic suspension bogie structure driven by a rotating motor, which comprises a track, a framework, a rotating motor and a permanent magnetic slope, wherein the track is provided with a mounting cavity, the framework is arranged in the mounting cavity through the permanent magnetic slope and vertically suspended on the track; the permanent magnetic slope has an angle with a horizontal plane, one side of the framework is provided with a wheel pair arranged through the side, the wheel pair has only a rotation freedom degree around a vertical shaft relative to the framework; when the framework and the wheel pair slide from a position with high slope to a position with low slope, the framework as a whole slides to a traction surface through side sliding of the slope and natural suspension of the permanent magnet, and the wheel pair is driven to transversely adhere to the traction surface; the rotating motor is arranged on the framework and drives the wheel pair to rotate through a transmission mechanism.

Description

Technical Field

[0001] This invention relates to the field of rail transport vehicle technology, and more specifically to a magnetic levitation bogie structure using a rotating electric motor for traction. Background Technology

[0002] In the following discussion, "vertical" refers to the direction of gravitational acceleration, "longitudinal" is the direction of forward movement, "lateral" refers to the horizontal direction perpendicular to "vertical" and "longitudinal", and "lateral" refers to both sides relative to the longitudinal centerline of the track or bogie.

[0003] In the following discussion, "magnetic track" refers to a permanent magnet track laid along both sides of the "longitudinal direction", and "magnetic wheel" refers to a permanent magnet fixedly installed on the vehicle bogie that achieves natural levitation with the "magnetic track" through the repulsion of like poles of the permanent magnets.

[0004] Magnetic levitation supports objects and transports them along tracks in a non-contact manner, eliminating mechanical friction and not relying on wheels to bear vertical gravity loads. Therefore, all magnetic levitation vehicles use linear motors for traction, and there is currently no research or related technological invention involving the use of rotary motors to traction magnetic levitation vehicles.

[0005] Currently, various types of maglev vehicles inevitably employ rotating wheels as auxiliary machinery. For example, low-speed maglev vehicles using electromagnetic levitation use small rotating wheels as emergency support when the vehicle loses its levitation function, and their traction method uses short-stator linear induction motors. In Japan's low-temperature superconducting high-speed electric maglev vehicles, large rotating wheels are used as the vehicle's running mechanism during low-speed phases when the vehicle cannot levitate electrically or when it is stopped, but their traction method uses long-stator linear synchronous motors. In the field cooling phase before zero-speed start-up of high-temperature superconducting maglev vehicles, small support wheels are needed to support the entire vehicle at the field cooling height until the high-temperature superconducting material cools to the transition temperature in the external magnetic field and generates levitation function before the small wheel support is removed, and its traction method uses long-stator linear synchronous motors. Permanent magnet natural levitation vehicles use more wheels to keep the bogie running along the track beam, but do not bear the vertical weight of the vehicle, and their traction method uses short-stator linear induction motors.

[0006] The advantage of linear motors as vehicle traction motors is that they eliminate the need for rotating parts. However, a drawback is that the vehicle's relative motion to the track is significant, requiring a sufficient gap between the rotor and stator of the linear motor. This results in a larger operating magnetic gap, negatively impacting motor efficiency and power factor, leading to lower overall traction efficiency. In contrast, the rotor and stator of a rotary motor are a single, integrated unit. The magnetic gap between the rotor and stator is much smaller than that of a linear motor, and this gap remains constant. Therefore, rotary motors offer significantly higher efficiency and power factor than linear motors.

[0007] Currently, all maglev vehicle bogies use linear motors instead of rotary motors, thus failing to fully utilize the advantages of rotary motors. Taking a suspended permanent magnet natural levitation bogie with linear motor traction as an example, its basic structure is shown in the attached figure. Figure 1 As shown in the figure, only functional components related to suspension, guidance, and traction are illustrated.

[0008] The bogie consists of a bogie frame and the lateral wheels, linear motor primary coils, and other functional components mounted on it.

[0009] The "permanent magnet levitation surface" is formed by permanent magnets installed on the track and permanent magnets installed on the bogie. It achieves natural levitation of permanent magnets based on the principle of like poles repulsion. The bogie, which is subjected to the lateral slip of the permanent magnet levitation surface, is constrained within the track beam by the "lateral wheels" on the bogie. By supplying power to the "primary linear motor" installed on the frame and controlling its traveling wave magnetic field, the electromagnetic force between the "primary coil of the linear motor" and the "secondary induction plate of the linear motor" installed on the track drives the bogie to run within the track beam.

[0010] Since maglev vehicles lack sufficiently large and uniformly stable rotating wheels with good adhesion, they cannot use rotary motors and must use linear motors. When linear motors are used on maglev vehicles, the primary and secondary windings of the linear motor are installed on the vehicle and the track, respectively. There is macroscopic relative motion between the two in the direction perpendicular to the traction surface of the linear motor. Therefore, there must be sufficient clearance between the rotor and stator of the linear motor, resulting in a larger working magnetic gap of the motor. This has a negative impact on the motor efficiency and power factor, and the overall traction efficiency is lower than that of rotary motors. Summary of the Invention

[0011] The purpose of this invention is to provide a magnetic levitation bogie structure using a rotating electric motor for traction, in order to solve the technical problems in the background art.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] A magnetic levitation bogie structure using a rotary motor for traction includes: a track, a frame, a rotary motor, and a permanent magnet ramp. The track has a mounting cavity, and the frame is mounted in the mounting cavity via the permanent magnet ramp and is vertically suspended from the track. The permanent magnet ramp forms an angle with the horizontal plane, and a through-type wheel pair is provided on one side of the frame. The wheel pair has only rotational freedom about the vertical axis relative to the frame. When the frame and wheel pair slide from a high slope position to a low slope position, the frame slides towards the traction surface through the slope and the lateral sliding of the permanent magnet ramp, causing the wheel pair to laterally contact the traction surface. The rotary motor is mounted on the frame and drives the wheel pair to rotate through a transmission mechanism.

[0014] In some embodiments, the permanent magnet slope is composed of inclined magnetic wheels and magnetic rails. The magnetic wheels are installed on the left and right sides of the frame, and the magnetic rails are installed on the left and right sides of the track. The magnetic wheels and magnetic rails on the left and right sides are respectively arranged opposite to each other, and the permanent magnet slope composed of the magnetic wheels and magnetic rails has an angle with the horizontal plane.

[0015] In some embodiments, the left and right side walls of the mounting cavity are respectively provided with track support seats arranged in opposite directions. The left track support seat is used to install the left magnetic rail, and the right track support seat is used to install the right magnetic rail. The inclination angle of the support surface of the left track support seat and the right track support seat is equal to the angle between the permanent magnet slope and the horizontal plane.

[0016] In some embodiments, the frame has an upper top surface and a lower bottom surface, which are respectively disposed on the upper and lower sides of the track support. The left magnetic wheel is disposed on the left side of the lower part of the upper top surface, and the right magnetic wheel is disposed on the right side of the lower part of the upper top surface. The inclination angles of the lower mounting surfaces of the left and right upper top surfaces are equal to the angle between the permanent magnet slope and the horizontal plane.

[0017] In some embodiments, the wheelset includes an upper lateral wheel, a lower lateral wheel, and a pivot, the pivot being mounted on a frame and having only rotational freedom about a vertical axis relative to the frame; the upper lateral wheel and the lower lateral wheel are mounted on the pivot; the upper lateral wheel, the lower lateral wheel, and the pivot all have identical rotational freedom about a vertical axis relative to the frame; a permanent magnet slope is located between the upper lateral wheel and the lower lateral wheel.

[0018] In some embodiments, the transmission mechanism includes: a coupling and an axle gearbox. The coupling is mounted on the output end of the rotary motor, and the axle gearbox is mounted on a rotating shaft. The rotary motor and the input shaft of the axle gearbox are connected by the coupling to transmit torque from the rotary motor to the axle gearbox.

[0019] The beneficial effects of this invention compared to the prior art are:

[0020] This invention features a pre-designed inclined permanent magnet levitation surface in the bogie frame, forming a "permanent magnet slope." Utilizing this slope and the lateral slip characteristics of natural permanent magnet levitation, the entire bogie slides to one side. A tire-type lateral wheel is installed on this side, creating a rotating wheel with sufficiently large, uniform, and stable adhesion. This lateral wheel is then driven by a rotary motor mounted on the bogie frame. Since the adhesion force of the lateral wheel is only the lateral component of gravity, its magnitude is related to the slope of the levitation surface. The slope only needs to be sufficient to generate the adhesion force required for traction or emergency braking deceleration. This invention solves the problem of current technologies lacking rotating tires that meet traction requirements. By replacing linear motors with rotary motors, it significantly improves the overall traction efficiency and motor power factor of the system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a bogie in the prior art;

[0022] Figure 2 This is a schematic diagram of the magnetic levitation bogie structure using a rotating electric motor for traction, as described in this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0028] The following will combine Figure 2This application provides a detailed description of a magnetic levitation bogie structure using a rotating electric motor for traction, as described in the embodiments of this application. It is worth noting that the following embodiments are merely illustrative of this application and do not constitute a limitation thereof.

[0029] Example 1:

[0030] like Figure 2 As shown, a magnetic levitation bogie structure using a rotary motor for traction includes: a track 1, a frame 5, a rotary motor, and a permanent magnet ramp 9. The track has a mounting cavity, and the frame is mounted within the mounting cavity via the permanent magnet ramp and is vertically suspended from the track. The permanent magnet ramp forms an angle with the horizontal plane, and a wheelset is provided through one side of the frame. The wheelset has only rotational freedom about its vertical axis relative to the frame. The permanent magnet ramp is located at the middle of the wheelset vertically, so that the clamping force on the upper and lower lateral wheels of the wheelset is theoretically equal. When the frame and wheelset slide from a high-slope position to a low-slope position, the wheelset first contacts the inner wall of the track mounting cavity. Through the slope and the lateral sliding of the permanent magnet's natural levitation, the entire frame slides towards the traction surface, causing the wheelset to laterally contact the traction surface 10. The rotary motor is mounted on the frame and drives the wheelset to rotate through a transmission mechanism. The magnitude of the clamping force between the wheelset and the traction surface depends on the slope of the permanent magnet ramp, and the clamping force should meet the deceleration requirements during emergency braking.

[0031] The transmission mechanism includes: a coupling 7 and an axle gearbox 8. The coupling is installed at the output end of the rotary motor, and the axle gearbox is installed on the rotating shaft. The rotary motor and the input shaft of the axle gearbox are connected by the coupling to transmit torque from the rotary motor to the axle gearbox.

[0032] The rotary motor consists of a rotary motor stator 3 and a rotary motor rotor 4. The rotary motor rotor is connected to the input shaft of the axle gearbox via a coupling, which transmits torque from the motor to the gearbox.

[0033] See Figure 2 The permanent magnet ramp is composed of magnetic wheels 11 and magnetic rails 12. The magnetic wheels are installed on the left and right sides of the frame, and the magnetic rails are installed on the left and right sides of the track. The magnetic wheels and magnetic rails on the left and right sides are respectively arranged opposite each other, and the magnetic wheels and magnetic rails have an angle with the horizontal plane. This angle is artificially set to be a ramp with a certain horizontal inclination in the same direction. By utilizing the side-slip characteristics of permanent magnet levitation, the entire bogie slides to one side, and at the same time, the lateral movement of the bogie is constrained on that side by mechanical wheels or other means such as electromagnets. In principle, the nominal balance position of the bogie is constructed. This position is independent of external interference, that is, it will not change under external interference.

[0034] The mounting cavity has opposing track support seats 6 on its left and right side walls. The left track support seat is used to install the left magnetic rail, and the right track support seat is used to install the right magnetic rail. The inclination angle of the support surface of both the left and right track support seats is equal to the angle between the permanent magnet slope and the horizontal plane. The track support seats can be integrally formed with the track, and the inclination angle of the support surface on the track support seats only needs to be present at the location where the magnetic rail is installed.

[0035] See also Figure 2 The wheelset includes an upper lateral wheel 2, a lower lateral wheel 13, and a pivot 14. The pivot is mounted on the frame and has only rotational freedom about the vertical axis relative to the frame. The upper and lower lateral wheels are mounted on the pivot 14. The three are fixedly connected to form a rigid body that can be called a "wheelset," and the three have identical rotational freedom about the vertical axis relative to the frame.

[0036] Sideslip characteristics are a major disadvantage of permanent magnet natural suspension. Existing technologies all use left-right mirror symmetrical guide structures. Theoretically, there is no describable, clear geometric trajectory on the track, which makes the bogie always tend to the geometric trajectory during operation.

[0037] Because the permanent magnet slope is at a certain angle to the horizontal, the lateral sliding characteristic of permanent magnet levitation makes the frame inevitably have a tendency to slide laterally from a position with a high slope to a position with a low slope.

[0038] Due to the constraints of the upper and lower lateral wheels, the aforementioned lateral sliding is on the vertical surface of the corresponding side of the track and has a certain clamping force. The magnitude of the clamping force depends on the slope setting of the suspension surface.

[0039] When the bogie is running on the track, it always maintains the above-mentioned sliding and force-bearing tendencies, so that the bogie always runs along the guide surface of the track.

[0040] This application utilizes the slope of the permanent magnet ramp and sets the permanent magnet ramp in the middle of the wheelset in the vertical direction, so that the entire frame slides to one side, thereby driving the lateral wheelset to be stably pressed against the traction surface, so that the upper lateral wheels and the lower lateral wheels bear uniform and stable adhesion force.

[0041] Based on the conditions described above, magnetic levitation vehicles can use a rotating motor drive wheel pair consisting of a rotating motor stator and a rotating motor rotor to achieve traction by utilizing the adhesion of the tires and the friction of the track traction surface.

[0042] Due to the effect of the "permanent magnet slope", most of the vehicle's weight is borne by permanent magnet levitation, and the lateral component of gravity only needs to meet the traction requirements, accounting for only a small part of the vehicle's weight.

[0043] The physical effects achieved by this invention enable magnetic levitation vehicles to also use rotating motors for traction, thereby fundamentally changing the problems of large variation range of magnetic gap between motor rotor and stator, low traction efficiency, and low power factor that exist when magnetic levitation vehicles use linear motors.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic levitation bogie structure using a rotating electric motor for traction, characterized in that, include: The system comprises a track, a frame, a rotary motor, and a permanent magnet ramp. The track has a mounting cavity, and the frame is mounted within the mounting cavity via the permanent magnet ramp and is vertically suspended from the track. The permanent magnet ramp forms an angle with the horizontal plane. One side of the frame has a through-type wheel pair, which has only rotational freedom about its vertical axis relative to the frame. When the frame and wheel pair slide from a high-slope position to a low-slope position, the frame slides towards the traction surface through the lateral sliding of the permanent magnet ramp and the natural suspension of the permanent magnet, causing the wheel pair to laterally contact the traction surface. The rotary motor is mounted on the frame and drives the wheel pair to rotate through a transmission mechanism. The permanent magnet ramp consists of inclined magnetic wheels and magnetic rails. The magnetic wheels are mounted on the left and right sides of the frame, and the magnetic rails are mounted on the left and right sides of the track, with the magnetic wheels and magnetic rails on the left and right sides respectively arranged opposite each other. The permanent magnet ramp formed by the magnetic wheels and magnetic rails forms an angle with the horizontal plane.

2. The magnetic levitation bogie structure using a rotating electric motor for traction according to claim 1, characterized in that, The mounting cavity has two opposing track support seats on its left and right side walls. The left track support seat is used to install the left magnetic track, and the right track support seat is used to install the right magnetic track. The inclination angle of the support surface of the left and right track support seats is equal to the angle between the permanent magnet slope and the horizontal plane.

3. A magnetic levitation bogie structure using a rotating electric motor for traction according to claim 2, characterized in that, The frame has an upper top surface and a lower bottom surface, which are respectively located on the upper and lower sides of the track support. The left magnetic wheel is located on the lower left side of the upper top surface, and the right magnetic wheel is located on the lower right side of the upper top surface. The inclination angles of the lower mounting surfaces of the left and right upper top surfaces are equal to the angle between the permanent magnet slope and the horizontal plane.

4. A magnetic levitation bogie structure using a rotating electric motor for traction according to claim 3, characterized in that, The wheelset includes an upper lateral wheel, a lower lateral wheel, and a pivot. The pivot is mounted on the frame and has only rotational freedom about the vertical axis relative to the frame. The upper lateral wheel and the lower lateral wheel are mounted on the pivot. The upper lateral wheel, the lower lateral wheel, and the pivot all rotate about the vertical axis relative to the frame in the same way. The permanent magnet slope is located between the upper lateral wheel and the lower lateral wheel.

5. A magnetic levitation bogie structure using a rotating electric motor for traction according to claim 4, characterized in that, The transmission mechanism includes: a coupling and an axle gearbox. The coupling is installed at the output end of the rotary motor, and the axle gearbox is installed on the rotating shaft. The rotary motor and the input shaft of the axle gearbox are connected by the coupling to transmit torque from the rotary motor to the axle gearbox.

Images