Levitation and propulsion system for medium-low-speed maglev vehicle, and maglev vehicle

Abstract

A levitation and propulsion system for a medium-low-speed maglev vehicle, and a maglev vehicle. The levitation and propulsion system comprises an M-shaped rail, a U-shaped levitation electromagnet, and a traction electric motor stator (500), wherein the M-shaped rail comprises a body (411) and a traction electric motor secondary induction plate (412) fixed to the middle of a lower surface of the body (411), and an upper surface of the body (411) is fixedly connected to a lower surface of a T-shaped track beam (100). The U-shaped levitation electromagnet is located below the M-shaped rail and mounted to the lower part of a levitation frame support arm (220) of a vehicle body. The U-shaped levitation electromagnet comprises a first core (741) and a second core (742) arranged opposite each other, and a magnetic yoke (710) for connecting the first core (741) and the second core (742). The first core (741) and the second core (742) are each wound with an excitation coil (720), a water cooling plate (730) is laid on an inner wall of a U-shaped accommodating cavity formed by the excitation coil (720) and the magnetic yoke (710), and the traction electric motor stator (500) is fixed to the side of the water cooling plate (730) facing away from the magnetic yoke (710) and corresponds in terms of position to the traction electric motor secondary induction plate (412).

Description

A levitation propulsion system for medium- and low-speed maglev vehicles, and maglev vehicles.

[0001] This application claims priority to Chinese Patent Application No. 202411444075.9, filed on October 16, 2024, entitled "A Suspension Propulsion System for Medium and Low Speed ​​Maglev Vehicles and a Maglev Vehicle", the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent Application No. 202422501116.5, filed on October 16, 2024, entitled "A Suspension Propulsion System for Medium and Low Speed ​​Maglev Vehicles and a Maglev Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of rail transit technology, and in particular to a levitation propulsion system and a maglev vehicle for medium and low speed maglev vehicles. Background Technology

[0004] A maglev train is a rail transit system without wheels or gear transmission mechanisms. The train maintains a constant gap with the track during operation. Maglev vehicles are equipped with levitation electromagnets located below the track, which is made of magnetically conductive material. By energizing the levitation electromagnets with current, a closed main magnetic flux is generated. The magnetic field in the air gap between the levitation electromagnets and the track creates an attractive force between them, thus leviting the vehicle.

[0005] Most current maglev trains use natural air cooling to dissipate heat from the levitation electromagnets and traction motors. However, the operating speed of medium and low speed maglev vehicles is low, so the effect of natural air cooling is not ideal. Moreover, due to the structural space requirements of natural air cooling, the traction motors and levitation electromagnets of medium and low speed maglev vehicles are arranged on the upper and lower sides of the track beam, which has an adverse effect on further improving the vehicle's load-bearing capacity.

[0006] Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a levitation propulsion system for medium and low speed maglev vehicles, which improves the vehicle's load-bearing capacity while avoiding overheating during operation of the levitation propulsion system.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A levitation propulsion system for medium- and low-speed maglev vehicles includes:

[0010] M-shaped rail, the M-shaped rail includes a body and a secondary induction plate of a traction motor fixed to the middle of the lower surface of the body, the upper surface of the body is fixedly connected to the lower surface of the T-shaped rail beam;

[0011] The U-shaped levitation electromagnet is located below the M-shaped rail and installed on the lower part of the suspension frame support arm of the vehicle body. The U-shaped levitation electromagnet includes a first iron core and a second iron core arranged opposite to each other, and a magnetic yoke connecting the first iron core and the second iron core. The first iron core and the second iron core are respectively wound with excitation coils. The inner wall of the concave cavity formed by the excitation coils and the magnetic yoke is covered with a water-cooling plate.

[0012] The stator of the traction motor is fixed to the side of the water-cooled plate facing away from the magnetic yoke and corresponds to the position of the secondary induction plate of the traction motor.

[0013] Optionally, the above-mentioned levitation propulsion system includes an electromagnet back box that carries the U-shaped levitation electromagnet, and the electromagnet back box is connected to the lower part of the suspension frame support arm through a series of elastic devices.

[0014] Optionally, the above-mentioned levitation propulsion system includes a levitation sensor disposed on the back box of the electromagnet. The levitation sensor is used to collect target information and feed it back to the levitation controller. The target information includes at least the gap between the U-shaped levitation electromagnet and the M-shaped rail.

[0015] Optionally, in the above-described levitation propulsion system, the electromagnet back box is made of aluminum profile.

[0016] Optionally, in the above-mentioned levitation propulsion system, the water-cooled plate includes a first water-cooled plate and a second water-cooled plate disposed opposite to each other, and a third water-cooled plate located between the first water-cooled plate and the second water-cooled plate;

[0017] The first water-cooled plate is in contact with the excitation coil on the first iron core, the second water-cooled plate is in contact with the excitation coil on the second iron core, and the third water-cooled plate is in contact with the magnetic yoke.

[0018] Optionally, in the above-mentioned levitation propulsion system, a plurality of first iron cores are arranged on the first side of the upper surface of the magnetic yoke, and each first iron core is wound with an excitation coil.

[0019] The second side of the upper surface of the magnetic yoke is provided with a plurality of second iron cores, each of which is wound with an excitation coil.

[0020] Optionally, in the above-described levitation propulsion system, the first iron core and the second iron core are fixedly connected to the magnetic yoke by bolts.

[0021] Optionally, in the above-mentioned levitation propulsion system, the body of the M-shaped rail includes a first folded edge and a second folded edge located on both sides. The lower surface of the first folded edge and the upper surface of the first iron core are opposite each other and have the same width. The lower surface of the second folded edge and the upper surface of the second iron core are opposite each other and have the same width.

[0022] Optionally, in the above-mentioned levitation propulsion system, the magnetic yoke is provided with multiple weight-reduction holes.

[0023] A maglev vehicle includes a levitation propulsion system for medium- and low-speed maglev vehicles as disclosed in any of the foregoing claims.

[0024] As can be seen from the above technical solution, in the levitation propulsion system for medium- and low-speed maglev vehicles provided by this invention, the U-shaped levitation electromagnet is located below the M-shaped rail, which is fixed to the lower surface of the T-shaped track beam. The U-shaped levitation electromagnet is equipped with a water-cooling plate for active heat dissipation, improving the heat dissipation capacity of the levitation propulsion system. Furthermore, based on this high heat dissipation capacity, both the traction motor and the U-shaped levitation electromagnet are arranged on the lower side of the T-shaped track beam. The normal force generated when the traction motor stator is energized is in the same direction as the electromagnetic attraction force that provides levitation, thus sharing some of the load, thereby improving the vehicle's load-bearing capacity and reducing the levitation energy consumption of the U-shaped levitation electromagnet. In summary, this invention improves the load-bearing capacity of medium- and low-speed maglev vehicles while enhancing the heat dissipation capacity of the levitation propulsion system, effectively preventing overheating during operation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 is a partial cross-sectional schematic diagram of the maglev vehicle provided in an embodiment of the present invention;

[0027] Figure 2 is a three-dimensional schematic diagram of the suspension propulsion system for medium- and low-speed maglev vehicles provided in an embodiment of the present invention;

[0028] Figure 3 is a cross-sectional schematic diagram of the suspension propulsion system shown in Figure 2.

[0029] The diagram is marked as follows:

[0030] 100. T-shaped track beam; 210. Suspension frame; 220. Suspension frame support arm; 300. Electromagnet back box; 411. Body; 412. Traction motor secondary induction plate; 500. Traction motor stator; 600. Suspension sensor; 710. Magnetic yoke; 711. Weight reduction hole; 720. Excitation coil; 730. Water-cooled plate; 731. First water-cooled plate; 732. Second water-cooled plate; 733. Third water-cooled plate; 740. Iron core; 741. First iron core; 742. Second iron core. Detailed Implementation

[0031] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Referring to Figures 1-3, this embodiment of the invention provides a levitation propulsion system for medium- and low-speed maglev vehicles, including an M-shaped rail, a U-shaped levitation electromagnet, and a traction motor stator 500. The M-shaped rail includes a body 411 and a secondary induction plate 412 of the traction motor fixed to the middle of the lower surface of the body 411. The upper surface of the body 411 is fixedly connected to the lower surface of the T-shaped track beam 100. The U-shaped levitation electromagnet is located below the M-shaped rail and is installed on the lower part of the suspension frame support arm 220 of the vehicle body. The U-shaped levitation electromagnet includes a first iron core 741 and a second iron core 742 arranged opposite to each other, and a magnetic yoke 710 connecting the first iron core 741 and the second iron core 742. The first iron core 741 and the second iron core 742 are respectively wound with excitation coils 720. The inner wall of the U-shaped receiving cavity formed by the excitation coils 720 and the magnetic yoke 710 is covered with a water-cooling plate 730. The traction motor stator 500 is fixed to the side of the water-cooling plate 730 facing away from the magnetic yoke 710 and corresponds to the position of the secondary induction plate 412 of the traction motor.

[0033] The M-shaped rail is fixed to the lower surface of the T-shaped track beam 100, meaning the M-shaped rail is located on the opposite side of the supporting rail of the T-shaped track beam 100. The supporting rail of the T-shaped track beam 100 is the rail surface that provides upward support force when the vehicle is stationary and is in contact with the suspension frame 210. In the cross-sectional schematic diagram, such as Figures 1 and 3, the T-shaped track beam 100 is T-shaped, the body 411 of the M-shaped rail and the secondary induction plate 412 of the traction motor are generally M-shaped, and the yoke 710 and iron core 740 of the U-shaped suspension electromagnet are generally U-shaped. The first iron core 741 and the second iron core 742 of the U-shaped suspension electromagnet are opposite to the folded edges on both sides of the body 411 of the M-shaped rail. When the excitation coil 720 of the U-shaped suspension electromagnet is energized, an attractive force is generated between the iron core 740 and the body 411 of the M-shaped rail, thereby suspending the vehicle.

[0034] The U-shaped levitation electromagnet is equipped with a water-cooling plate 730 for active heat dissipation, improving the heat dissipation capacity of the levitation propulsion system. Furthermore, based on this high heat dissipation capacity, both the traction motor and the U-shaped levitation electromagnet are positioned under the T-shaped track beam 100, as shown in Figure 1. The traction motor stator 500 is located in the middle of the U-shaped levitation electromagnet, and the traction motor secondary induction plate 412 is located in the middle of the main body 411. When the traction motor stator 500 is energized, it interacts with the traction motor secondary induction plate 412 to generate electromagnetic thrust, propelling the vehicle. Since the traction motor stator 500 and the traction motor secondary induction plate 412 are located on the same side under the track, the normal force generated when the traction motor stator 500 is energized is in the same direction as the electromagnetic attraction force that provides levitation. This reduces the levitation energy consumption of the U-shaped levitation electromagnet. Moreover, the normal force generated when the traction motor stator 500 is energized further increases the levitation force, helping the U-shaped levitation electromagnet further improve the vehicle's load-bearing capacity. In summary, this invention improves the load-bearing capacity of medium- and low-speed maglev vehicles while enhancing the heat dissipation capacity of the levitation propulsion system, effectively preventing overheating during operation.

[0035] In some embodiments, the levitation propulsion system may include an electromagnet back box 300 supporting a U-shaped levitation electromagnet. The electromagnet back box 300 is connected to the lower part of the suspension frame support arm 220 via a series of elastic devices (not shown). As shown in FIG1, the U-shaped levitation electromagnet is mounted on the electromagnet back box 300, and the electromagnet back box 300 is elastically connected to the lower part of the suspension frame support arm 220. This improves the safety of the U-shaped levitation electromagnet and allows it to move relative to the suspension frame support arm 220 within a certain range of motion.

[0036] Furthermore, by providing an electromagnet back box 300, it is convenient to install other components on the electromagnet back box 300. For example, in some embodiments, the levitation propulsion system may include a levitation sensor 600 disposed on the electromagnet back box 300. The levitation sensor 600 is used to collect target information and feed it back to the levitation controller (not shown). The target information includes at least the gap between the U-shaped levitation electromagnet and the M-shaped rail. The levitation controller may be disposed on the levitation frame 210 and electrically connected to the levitation sensor 600 located on the electromagnet back box 300 via cables arranged along the levitation frame support arm 220. In addition to the gap between the U-shaped levitation electromagnet and the M-shaped rail, the target information collected by the levitation sensor 600 may also include information such as the acceleration of the U-shaped levitation electromagnet. The levitation controller controls the current and voltage output to the excitation coil 720 based on the target information fed back by the levitation sensor 600, so that the train levitates near the rated gap.

[0037] In some embodiments, the electromagnet back box 300 can be made of aluminum profile, which is lightweight and high-strength, thus helping to reduce the overall weight of the levitation propulsion system. Similarly, the suspension frame support arm 220 can be made of cast aluminum, which also helps to reduce weight. As shown in Figure 2, to further reduce weight, the magnetic yoke 710 can be provided with multiple weight-reducing holes 711, which also facilitate heat dissipation and further improve heat dissipation capacity.

[0038] In some embodiments, the water-cooled plate 730 may include a first water-cooled plate 731 and a second water-cooled plate 732 disposed opposite to each other, and a third water-cooled plate 733 located between the first water-cooled plate 731 and the second water-cooled plate 732. The first water-cooled plate 731 is in contact with the excitation coil 720 on the first iron core 741, the second water-cooled plate 732 is in contact with the excitation coil 720 on the second iron core 742, and the third water-cooled plate 733 is in contact with the magnetic yoke 710. As shown in FIG3, the first water-cooled plate 731, the second water-cooled plate 732, and the third water-cooled plate 733 are independent of each other. The first water-cooled plate 731 is mainly responsible for heat dissipation of the excitation coil 720 on the first iron core 741, the second water-cooled plate 732 is mainly responsible for heat dissipation of the excitation coil 720 on the second iron core 742, and the third water-cooled plate 733 is mainly responsible for heat dissipation of the traction motor stator 500 and the magnetic yoke 710. To improve heat dissipation, the third water-cooled plate 733 is in contact with the first water-cooled plate 731 and the second water-cooled plate 732 on both sides, respectively. In other embodiments, the first water-cooled plate 731, the second water-cooled plate 732 and the third water-cooled plate 733 can be configured as a single unit, or either the first water-cooled plate 731 and the second water-cooled plate 732 can be configured as a single unit with the third water-cooled plate 733.

[0039] In some embodiments, a plurality of first iron cores 741 may be arranged along the first side of the upper surface of the magnetic yoke 710, each first iron core 741 being wound with an excitation coil 720, and a plurality of second iron cores 742 may be arranged along the second side of the upper surface of the magnetic yoke 710, each second iron core 742 being wound with an excitation coil 720. As shown in Figures 1 to 3, the iron core 740 of the U-shaped levitation electromagnet includes a plurality of first iron cores 741 and a plurality of second iron cores 742, which facilitates the manufacture of U-shaped levitation electromagnets and allows for flexible selection of a suitable length of magnetic yoke 710 as needed, thereby manufacturing U-shaped levitation electromagnets of different specifications. The connection method between the iron cores 740 and the magnetic yoke 710 can be varied. For example, the first iron cores 741 and the second iron cores 742 can be fixedly connected to the magnetic yoke 710 by bolts, or the first iron cores 741 and the second iron cores 742 can be integrated with the magnetic yoke 710 into a single structure.

[0040] As shown in Figure 3, the body 411 of the M-shaped rail includes a first flange and a second flange located on both sides. In some embodiments, the lower surface of the first flange and the upper surface of the first iron core 741 are opposite each other and have the same width, and the lower surface of the second flange and the upper surface of the second iron core 742 are opposite each other and have the same width. By setting the lower surface of the flange of the M-shaped rail to have the same width as the upper surface of the iron core 740, it is beneficial to more accurately control the gap between the U-shaped levitation electromagnet and the M-shaped rail when the excitation coil 720 is energized.

[0041] The present invention also provides a maglev vehicle, which includes the levitation propulsion system for medium- and low-speed maglev vehicles disclosed in the above embodiments. Since the levitation propulsion system disclosed in the above embodiments has the aforementioned technical effects, the maglev vehicle having this levitation propulsion system also has the aforementioned technical effects, and will not be described again here.

[0042] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A levitation propulsion system for a medium-low speed maglev vehicle, characterized in that, include: M-shaped rail, the M-shaped rail includes a body and a secondary induction plate of a traction motor fixed to the middle of the lower surface of the body, the upper surface of the body is fixedly connected to the lower surface of the T-shaped rail beam; The U-shaped levitation electromagnet is located below the M-shaped rail and installed on the lower part of the suspension frame support arm of the vehicle body. The U-shaped levitation electromagnet includes a first iron core and a second iron core arranged opposite to each other, and a magnetic yoke connecting the first iron core and the second iron core. The first iron core and the second iron core are respectively wound with excitation coils. The inner wall of the concave cavity formed by the excitation coil and the magnetic yoke is covered with a water-cooling plate. The stator of the traction motor is fixed to the side of the water-cooled plate facing away from the magnetic yoke and corresponds to the position of the secondary induction plate of the traction motor.

2. The levitation propulsion system of claim 1, wherein, It includes an electromagnet back box that supports the U-shaped levitation electromagnet, and the electromagnet back box is connected to the lower part of the suspension frame support arm through a series of elastic devices.

3. The levitation propulsion system of claim 2, wherein, It includes a levitation sensor disposed on the back box of the electromagnet, the levitation sensor being used to collect target information and feed it back to the levitation controller, the target information including at least the gap between the U-shaped levitation electromagnet and the M-shaped rail.

4. The levitation propulsion system of claim 2, wherein, The electromagnet back box is made of aluminum profile.

5. The levitation propulsion system of claim 1, wherein, The water-cooled plate includes a first water-cooled plate and a second water-cooled plate disposed opposite to each other, and a third water-cooled plate located between the first water-cooled plate and the second water-cooled plate; The first water-cooled plate is in contact with the excitation coil on the first iron core, the second water-cooled plate is in contact with the excitation coil on the second iron core, and the third water-cooled plate is in contact with the magnetic yoke.

6. The levitation propulsion system of claim 1, wherein, The first side of the upper surface of the magnetic yoke is provided with a plurality of first iron cores arranged thereon, and each first iron core is wound with an excitation coil. The second side of the upper surface of the magnetic yoke is provided with a plurality of second iron cores, each of which is wound with an excitation coil.

7. The levitation propulsion system of claim 6, wherein, The first iron core and the second iron core are fixedly connected to the magnetic yoke by bolts.

8. The levitation propulsion system according to any one of claims 1 to 7, wherein The body of the M-shaped rail includes a first folded edge and a second folded edge located on both sides. The lower surface of the first folded edge and the upper surface of the first iron core are opposite each other and have the same width. The lower surface of the second folded edge and the upper surface of the second iron core are opposite each other and have the same width.

9. The levitation propulsion system of claim 8, wherein, The magnetic yoke is provided with multiple weight-reducing holes.

10. A maglev vehicle, characterized by Includes the levitation propulsion system for medium- and low-speed maglev vehicles as described in any one of claims 1 to 9.

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