Magnetic-levitation train traction suspension combined type induction rail and traction suspension system electromagnetic structure

Abstract

The invention relates to the technical field of magnetic suspension, and aims to solve the problems that the layout mode that a suspension electromagnet and a linear induction motor of a traditional magnetic-levitation train are independent of each other occupies a large space, and normal force of the linear induction motor has a negative effect on suspension force. The invention provides a magnetic-levitation train traction suspension combined type induction rail and a traction suspension system electromagnetic structure. The traction suspension combined type induction rail comprises an electromagnet induction rail body, the electromagnet induction rail body is arranged below a track beam in the line direction, protrusions are downwards formed on the two sides of the electromagnet induction rail body, the end faces of the protrusions are the pole faces of the electromagnet induction rail body, and an installation cavity is formed between the protrusions on the two sides. A mounting rail is arranged in the mounting cavity, and the mounting rail is connected with the electromagnet induction rail; a plane is formed at the bottom of the mounting rail and is a secondary mounting surface of the linear induction motor; according to the invention, the occupied space can be reduced, and the suspension performance of the vehicle can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic levitation, and in particular to a traction suspension composite induction rail for a magnetic levitation train and an electromagnetic structure of a traction suspension system. Background Art

[0002] Maglev vehicles represent the forefront of modern rail transportation technology. By applying advanced electromagnetic theory, they achieve a contactless operation between the vehicle body and the track. The core of this technology is to use electromagnetic force to overcome the earth's gravity, so that the train can be suspended on the track, thereby greatly reducing the inevitable friction loss in the traditional wheel-rail system. Maglev trains can not only reach extremely high operating speeds, but also because there is no direct physical contact, the noise and vibration generated during operation are much lower than traditional railway transportation vehicles.

[0003] Among them, the suspension electromagnet and traction linear motor are the key components for the maglev vehicle to achieve suspension and propulsion. They each play a different role and together ensure the efficient operation of the maglev train.

[0004] In common maglev vehicle designs, the electromagnet is installed at the bottom of the vehicle, and the electromagnet induction rail is usually set under the track beam. Because its shape resembles the letter F, it is also called the F rail (see Figure 1 ). When the electromagnet is energized, it will generate a magnetic field. The interaction between this magnetic field and the induction rail can generate an upward force to make the train levitate.

[0005] The traction linear motor is the power source of the maglev train. It is divided into two types: linear synchronous motor and linear induction motor. At present, linear induction motor is more common in medium and low speed maglev transportation. The primary of this type of linear motor consists of an iron core and a winding, which is installed at the bottom of the train; the secondary is a thin metal plate laid along the top of the track beam, also called a reaction plate (see Figure 1 ). When the primary is powered, a magnetic field is generated along the direction of the track, which interacts with the induced magnetic field in the reaction plate to generate thrust, pushing the train forward.

[0006] like Figure 1 As shown in the figure, the suspension electromagnet induction rail and the linear induction motor secondary (reaction plate) of the traditional maglev train are arranged on the upper and lower surfaces of the track beam respectively. The working magnetic field of the suspension electromagnet and the magnetic field of the traction linear motor are independent of each other. Figure 1In the figure, reference numeral 101 is the primary of the linear induction motor, reference numeral 102 is the secondary of the linear induction motor, reference numeral 103 is the F rail, reference numeral 104 is the electromagnet yoke, reference numeral 105 is the electromagnet coil, and reference numeral 106 is the track beam. This solution not only takes up a large space, but also because the direction of the normal force of the motor is opposite to the direction of the electromagnet suction force, the traction motor will have an adverse effect on the suspension of the train when it is working, and increase the working current and control difficulty of the electromagnet. Summary of the invention

[0007] The present invention aims to provide a composite induction rail for traction suspension of a maglev train and an electromagnetic structure of a traction suspension system, so as to solve the problem that the independent layout of the suspension electromagnet and the linear induction motor of a traditional maglev train occupies a large space and the normal force of the linear induction motor has a negative effect on the suspension force.

[0008] The present invention is achieved by adopting the following technical solutions:

[0009] The present invention provides a maglev train traction suspension composite induction rail, comprising an electromagnet induction rail, the electromagnet induction rail is arranged below a track beam along a line direction, protrusions are formed downward on both sides of the electromagnet induction rail, the end faces of the protrusions are the pole faces of the electromagnet induction rail, and an installation cavity is formed between the protrusions on both sides;

[0010] A mounting rail is provided in the mounting cavity, and the mounting rail is connected to the electromagnet induction rail;

[0011] A plane is formed at the bottom of the mounting rail, and the plane is the mounting surface of the secondary of the linear induction motor.

[0012] Since the maglev train traction suspension composite induction rail of the present invention has protrusions formed downward on both sides, and an installation cavity is formed between the protrusions on both sides, the installation cavity is installed with the installation rail, and the bottom of the installation rail is used to install the secondary of the linear induction motor, therefore, the above structure is adopted to realize that the electromagnet induction rail and the secondary of the linear induction motor are both arranged below the track beam, instead of the traditional method of independently arranging the two on the upper and lower sides of the track beam. After the secondary of the linear induction motor is arranged below the track beam, in order to ensure the coordination between the primary of the linear induction motor and the secondary of the linear induction motor, the primary of the linear induction motor will also be arranged below the track beam. Compared with the traditional arrangement method, the present invention can reduce the volume occupied above the track beam, and the secondary of the linear induction motor can be arranged in the installation cavity of the electromagnet induction rail, and the primary of the linear induction motor can correspond thereto, and the overall structure occupies less space.

[0013] Moreover, when the primary of the linear induction motor and the secondary of the linear induction motor are arranged above the track beam, the normal force direction of the linear induction motor is downward, while the electromagnetic attraction direction between the electromagnet induction rail and the electromagnet is upward, and the direction of the electromagnetic attraction direction is opposite to the normal force direction of the linear induction motor, resulting in an adverse effect on the suspension of the train when the traction motor is working, increasing the working current and control difficulty of the electromagnet; after the secondary of the linear induction motor and the primary of the linear induction motor are arranged below the track beam in the present invention, the primary of the linear induction motor will be located below the secondary of the linear induction motor, and the normal force direction of the linear induction motor is upward, which is the same as the direction of the electromagnetic attraction direction between the electromagnet induction rail and the electromagnet, and the normal force of the linear induction motor can be used to provide partial suspension force for the maglev train. Therefore, the maglev train using the traction suspension composite induction rail of the present invention has stronger suspension performance, while also avoiding adverse effects on the suspension of the train, and can reduce the working current and control difficulty of the electromagnet.

[0014] The composite induction rail for traction suspension of a maglev train of the present invention breaks the conventional design concept. By changing the shape of the electromagnet induction rail and the arrangement position of the secondary of the linear induction motor, the direction of the normal force of the linear induction motor is changed. On the one hand, it reduces the space occupation, and on the other hand, it can improve the suspension performance of the vehicle.

[0015] As the preferred technical solution:

[0016] The electromagnet induction rail is fixedly connected to the track beam.

[0017] As the preferred technical solution:

[0018] The mounting rail is fixedly connected to the electromagnet induction rail.

[0019] As the preferred technical solution:

[0020] The electromagnet induction rail adopts an inverted U-shaped structure.

[0021] As the preferred technical solution:

[0022] The mounting rail is arranged at a middle position of the electromagnet induction rail.

[0023] As the preferred technical solution:

[0024] The plane is parallel to the lower surface of the electromagnet induction rail and the lower surface of the track beam.

[0025] As the preferred technical solution:

[0026] The electromagnet induction rail adopts a single-layer structure or a multi-layer stacked structure;

[0027] When the electromagnet induction rail adopts a multi-layer stacked structure, each electromagnet induction rail has the same shape but different sizes, and the electromagnet induction rail is installed in the installation cavity of another electromagnet induction rail, and the two electromagnet induction rails are adapted and fitted.

[0028] As the preferred technical solution:

[0029] A solid structure or a hollow structure is adopted between the mounting rail and the electromagnet induction rail.

[0030] The present invention further provides an electromagnetic structure of a traction suspension system, comprising the above-mentioned maglev train traction suspension composite induction rail, a suspension electromagnet and a linear induction motor;

[0031] The linear induction motor comprises a linear induction motor primary and a linear induction motor secondary, wherein the linear induction motor secondary is laid on the bottom surface of the mounting rail of the maglev train traction suspension composite induction rail, and the linear induction motor primary is arranged below the linear induction motor secondary and is arranged opposite to the linear induction motor secondary;

[0032] The suspension electromagnet is arranged below the maglev train traction suspension composite induction rail, and the two poles of the suspension electromagnet are respectively arranged opposite to the two pole surfaces of the electromagnet induction rail.

[0033] As the preferred technical solution:

[0034] The suspension electromagnet comprises a yoke and a coil, the yoke adopts a U-shaped structure, and the yoke is arranged opposite to the electromagnet induction rail;

[0035] The coils are respectively mounted on the left and right arms of the magnetic yoke, and the primary of the linear induction motor is arranged in the middle of the magnetic yoke, located in the U-shaped space of the magnetic yoke.

[0036] As the preferred technical solution:

[0037] A heat dissipation medium is filled between the primary of the linear induction motor and the upper surface of the yoke.

[0038] As the preferred technical solution:

[0039] The heat dissipation medium is thermally conductive silicone grease or a water-cooled plate. The heat dissipation medium is not limited to thermally conductive silicone grease and a water-cooled plate, and other structural members that can achieve heat dissipation effects may also be used.

[0040] As the preferred technical solution:

[0041] The magnetic yoke adopts an integral structure or a split structure;

[0042] The yoke comprises a main body located in the middle and arms located at both sides of the main body respectively;

[0043] When the yoke adopts an integral structure, the main body and the left and right arms are connected to form a whole;

[0044] When the magnetic yoke adopts a split structure, the main body is separated from the left and right arms, and the left and right arms of the magnetic yoke are respectively arranged on both sides of the main body.

[0045] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0046] 1. Since the maglev train traction suspension composite induction rail of the present invention has protrusions formed downward on both sides, and an installation cavity is formed between the protrusions on both sides, the installation cavity is installed with a mounting rail, and the bottom of the mounting rail is used to install the secondary of the linear induction motor, therefore, the above structure is adopted to realize that the electromagnet induction rail and the secondary of the linear induction motor are both arranged below the track beam, instead of the traditional method of independently arranging the two on the upper and lower sides of the track beam. After the secondary of the linear induction motor is arranged below the track beam, in order to ensure the coordination between the primary of the linear induction motor and the secondary of the linear induction motor, the primary of the linear induction motor will also be arranged below the track beam. Compared with the traditional arrangement method, the present invention can reduce the volume occupied above the track beam, and the secondary of the linear induction motor can be arranged in the installation cavity of the electromagnet induction rail, and the primary of the linear induction motor can correspond thereto, and the overall structure occupies less space.

[0047] 2. After the secondary and primary of the linear induction motor are arranged below the track beam, the primary of the linear induction motor will be located below the secondary of the linear induction motor. The normal force of the linear induction motor is directed upward, which is the same as the direction of the electromagnetic attraction between the electromagnet induction rail and the electromagnet. The normal force of the linear induction motor can be used to provide partial suspension force for the maglev train. Therefore, the maglev train using the traction suspension composite induction rail of the present invention has stronger suspension performance, while also avoiding adverse effects on the suspension of the train, and reducing the working current and control difficulty of the electromagnet.

[0048] 3. The composite induction rail for traction suspension of the maglev train of the present invention breaks the conventional design concept. By changing the shape of the electromagnet induction rail and the layout position of the secondary of the linear induction motor, the direction of the normal force of the linear induction motor is changed. On the one hand, it reduces the space occupation, and on the other hand, it can improve the suspension performance of the vehicle.

[0049] 4. The electromagnetic structure of the traction suspension system of the present invention adjusts the position of the primary of the linear induction motor to the middle of the suspension electromagnet, and adjusts the position of the coil of the suspension electromagnet from the middle of the magnetic yoke to the left and right arms of the magnetic yoke, so that the overall structure is compact and the space utilization rate is high. Not only the working air gaps of the two electromagnetic systems of the suspension electromagnet and the linear induction motor are combined into one, and the working air gaps of the suspension electromagnet and the linear induction motor are located in the same horizontal plane, which greatly reduces the space occupation, but also the normal force of the linear induction motor is consistent with the direction of the electromagnetic suction force, and the normal force can be used to provide part of the suspension force for the maglev train, thereby playing a role in assisting the suspension of the vehicle. Compared with the maglev train using the traditional independent arrangement of the suspension system and the traction system, the maglev train using the electromagnetic structure of the traction suspension system has a stronger suspension performance, and because the space required at the bottom of the train is reduced, the cross-sectional area of ​​the maglev train can be optimized, the weight of the vehicle can be reduced, and the further development of the maglev vehicle can be promoted.

[0050] 5. The electromagnetic structure of the traction suspension system of the present invention is filled with a heat dissipation medium between the primary of the linear induction motor and the upper surface of the yoke, which can dissipate heat for the linear induction motor and the suspension electromagnet at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the layout of the traction motor and suspension electromagnet of a traditional maglev train.

[0052] Figure 1 The bid numbers are: 101 - primary of linear induction motor, 102 - secondary of linear induction motor, 103 - F rail, 104 - electromagnet yoke, 105 - electromagnet coil, 106 - track beam.

[0053] Figure 2 The present invention is a schematic structural diagram of the composite induction rail for traction suspension of a maglev train.

[0054] Figure 3 The three-dimensional structure schematic diagram of the maglev train traction suspension composite induction rail described in the present invention.

[0055] Figure 4 It is a schematic diagram of the structure of the electromagnetic structure of the traction suspension system described in the present invention.

[0056] Figure 2-Figure 4 Middle icons: 1-electromagnet induction rail, 2-track beam, 3-mounting rail, 4-linear induction motor secondary, 5-linear induction motor primary, 6-yoke, 7-coil, 8-heat dissipation medium, 9-protrusion, 10-mounting cavity. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Example 1

[0059] like Figure 2 and Figure 3 As shown, this embodiment proposes a maglev train traction suspension composite induction rail, including an electromagnet induction rail 1, which is arranged below a track beam 2 along the line direction, and the electromagnet induction rail 1 is fixedly connected to the track beam 2.

[0060] Protrusions 9 are formed downwardly on both sides of the electromagnet induction rail 1 , and the end faces of the protrusions 9 are the pole faces of the electromagnet induction rail 1 . An installation cavity 10 is formed between the protrusions 9 on both sides.

[0061] In this embodiment, the electromagnetic induction rail 1 adopts an inverted U-shaped structure, that is, the cross section of the electromagnetic induction rail 1 is approximately inverted U-shaped, and the electromagnetic induction rail 1 of the inverted U-shaped structure has the installation cavity 10 .

[0062] A mounting rail 3 is disposed in the mounting cavity 10 , and the mounting rail 3 is fixedly connected to the electromagnet induction rail 1 .

[0063] In this embodiment, the mounting rail 3 is arranged at the middle position of the electromagnet induction rail 1 .

[0064] The bottom of the mounting rail 3 is formed with a plane, which is parallel to the lower surface of the electromagnet induction rail 1 and the lower surface of the track beam 2. The plane is the mounting surface of the linear induction motor secondary 4 (reaction plate).

[0065] The thickness of the mounting rail 3 can be adjusted up and down according to the requirements of the working air gap of the linear induction motor.

[0066] A solid structure (such as Figure 2 as shown in the right) or hollow structures (such as Figure 2 As shown on the left side of the figure, when a solid structure is adopted between the mounting rail 3 and the electromagnet sensing rail 1, the mounting rail 3 uses more materials, but has high structural strength, rigidity and stability; when a hollow structure is adopted between the mounting rail 3 and the electromagnet sensing rail 1, a lightweight design can be performed to reduce weight and save materials.

[0067] Wherein, the electromagnet induction rail 1 can adopt a single-layer structure (such as Figure 2 The electromagnetic induction rail 1 on the right side of the middle figure shows that a multi-layer stacked structure can also be used (such as Figure 2 As shown in the electromagnet induction rail 1 on the left in the middle, when a multi-layer stacked structure is adopted, each electromagnet induction rail 1 has the same shape and a certain difference in size. The electromagnet induction rail 1 is installed in the installation cavity 10 of another electromagnet induction rail 1, and the two electromagnet induction rails 1 are adapted to each other and fit tightly together.

[0068] The maglev train traction suspension composite induction rail described in this embodiment has protrusions 9 formed downward on both sides, and an installation cavity 10 is formed between the protrusions 9 on both sides. The installation cavity 10 is installed with a mounting rail 3, and the bottom of the mounting rail 3 is used to install the linear induction motor secondary 4. Therefore, the above structure is adopted to realize that the electromagnet induction rail 1 and the linear induction motor secondary 4 are both arranged below the track beam 2, instead of the traditional method of arranging the two independently on the upper and lower sides of the track beam 2. After the linear induction motor secondary 4 is arranged below the track beam 2, in order to ensure the coordination of the linear induction motor primary 5 and the linear induction motor secondary 4, the linear induction motor primary 5 will also be arranged below the track beam 2. Compared with the traditional arrangement method, the present invention can reduce the occupation of the volume above the track beam 2, and the linear induction motor secondary 4 can be arranged in the installation cavity 10 of the electromagnet induction rail 1, and the linear induction motor primary 5 can correspond thereto, and the overall structure occupies less space. The structure of the electromagnet induction rail 1 of the present invention can also optimize the magnetic field distribution of the electromagnet and provide lateral guiding force.

[0069] Moreover, when the linear induction motor primary 5 and the linear induction motor secondary 4 are arranged above the track beam 2, the normal force of the linear induction motor is directed downward, while the electromagnetic attraction between the electromagnet induction rail 1 and the electromagnet is directed upward, and the direction of the electromagnetic attraction is opposite to the normal force of the linear induction motor, resulting in an adverse effect on the suspension of the train when the traction motor is working, increasing the working current and control difficulty of the electromagnet; in this embodiment, after the linear induction motor secondary 4 and the linear induction motor primary 5 are arranged below the track beam 2, the linear induction motor primary 5 will be located below the linear induction motor secondary 4, and the normal force of the linear induction motor is directed upward, which is the same as the direction of the electromagnetic attraction between the electromagnet induction rail 1 and the suspension electromagnet, and the normal force of the linear induction motor can be used to provide partial suspension force for the maglev train. Therefore, compared with the traditional maglev train, the maglev train using the traction suspension composite induction rail of the present invention has a stronger suspension performance, while also avoiding adverse effects on the suspension of the train, and can reduce the working current and control difficulty of the electromagnet.

[0070] Example 2

[0071] like Figure 4As shown, this embodiment proposes an electromagnetic structure of a traction suspension system, including the maglev train traction suspension composite induction rail, a suspension electromagnet and a linear induction motor as described in Example 1, wherein the linear induction motor includes a linear induction motor primary 5 and a linear induction motor secondary 4, wherein the linear induction motor secondary 4 is laid on the bottom surface of the mounting rail 3 of the maglev train traction suspension composite induction rail, and the linear induction motor primary 5 is arranged directly below the linear induction motor secondary 4 and is arranged opposite to the linear induction motor secondary 4.

[0072] The suspension electromagnet is arranged directly below the maglev train traction suspension composite induction rail, and the two poles of the suspension electromagnet are respectively arranged opposite to the two pole surfaces of the electromagnet induction rail 1 .

[0073] The suspension electromagnet includes a yoke 6 and a coil 7. In the present embodiment, the yoke 6 has a U-shaped structure, that is, the cross section of the yoke 6 is approximately U-shaped. The yoke 6 is arranged opposite to the electromagnet induction rail 1.

[0074] The coil 7 is installed on the left and right arms of the yoke 6 respectively. The primary 5 of the linear induction motor is arranged in the middle of the yoke 6, located in the U-shaped space of the yoke 6, and installed close to the upper surface of the middle of the yoke 6, forming a layout in which the suspended electromagnet surrounds the linear induction motor, with a compact structure and high space utilization.

[0075] Furthermore, in order to enhance the heat dissipation effect of the linear induction motor and the suspension electromagnet, a heat dissipation medium 8 is filled between the primary 5 of the linear induction motor and the upper surface of the yoke 6. The heat dissipation medium 8 can be made of thermal grease, a water cooling plate, etc., which can dissipate heat for the linear induction motor and the suspension electromagnet at the same time.

[0076] The present invention adjusts the position of the primary 5 of the linear induction motor to the middle of the suspension electromagnet, and adjusts the position of the coil 7 of the suspension electromagnet from the middle of the yoke 6 to the left and right arms of the yoke 6, so that the overall structure is compact and the space utilization rate is high. Not only the working air gaps of the two electromagnetic systems of the suspension electromagnet and the linear induction motor are combined into one, and the working air gaps of the suspension electromagnet and the linear induction motor are located in the same horizontal plane, which greatly reduces the space occupation, but also the normal force of the linear induction motor is consistent with the direction of the electromagnetic suction force, and the normal force can be used to provide part of the suspension force for the maglev train, thereby playing a role in assisting the suspension of the vehicle.

[0077] Compared with maglev trains that use traditional independently arranged suspension systems and traction systems, maglev trains that use the electromagnetic structure of the traction suspension system have stronger suspension performance. In addition, since the space required at the bottom of the train is reduced, the cross-sectional area of ​​the maglev train can be optimized, the weight of the vehicle can be reduced, and the further development of maglev vehicles can be promoted.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite induction rail for traction suspension of a maglev train, characterized in that: It includes an electromagnet induction rail, which is arranged below the track beam along the line direction, with protrusions formed downward on both sides of the electromagnet induction rail, the end faces of the protrusions are the pole faces of the electromagnet induction rail, and a mounting cavity is formed between the protrusions on both sides; A mounting rail is provided in the mounting cavity, and the mounting rail is connected to the electromagnet induction rail; A plane is formed at the bottom of the mounting rail, and the plane is the mounting surface of the secondary of the linear induction motor.

2. The traction suspension composite induction rail for a maglev train according to claim 1 is characterized in that: The electromagnet induction rail adopts an inverted U-shaped structure.

3. The maglev train traction suspension composite induction rail according to claim 1, characterized in that: The mounting rail is arranged at a middle position of the electromagnet induction rail.

4. The maglev train traction suspension composite induction rail according to claim 1, characterized in that: The plane is parallel to the lower surface of the electromagnet induction rail and the lower surface of the track beam.

5. The maglev train traction suspension composite induction rail according to claim 1, characterized in that: The electromagnet induction rail adopts a single-layer structure or a multi-layer stacked structure; When the electromagnet induction rail adopts a multi-layer stacked structure, each electromagnet induction rail has the same shape but different sizes, and the electromagnet induction rail is installed in the installation cavity of another electromagnet induction rail, and the two electromagnet induction rails are adapted and fitted.

6. The maglev train traction suspension composite induction rail according to claim 1, characterized in that: A solid structure or a hollow structure is adopted between the mounting rail and the electromagnet induction rail.

7. An electromagnetic structure of a traction suspension system, characterized in that: It comprises the maglev train traction suspension composite induction rail, suspension electromagnet and linear induction motor as described in any one of claims 1 to 6; The linear induction motor comprises a linear induction motor primary and a linear induction motor secondary, wherein the linear induction motor secondary is laid on the bottom surface of the mounting rail of the maglev train traction suspension composite induction rail, and the linear induction motor primary is arranged below the linear induction motor secondary and is arranged opposite to the linear induction motor secondary; The suspension electromagnet is arranged below the maglev train traction suspension composite induction rail, and the two poles of the suspension electromagnet are respectively arranged opposite to the two pole surfaces of the electromagnet induction rail.

8. The electromagnetic structure of the traction suspension system according to claim 7, characterized in that: The suspension electromagnet comprises a yoke and a coil, the yoke adopts a U-shaped structure, and the yoke is arranged opposite to the electromagnet induction rail; The coils are respectively mounted on the left and right arms of the magnetic yoke, and the primary of the linear induction motor is arranged in the middle of the magnetic yoke, located in the U-shaped space of the magnetic yoke.

9. The electromagnetic structure of the traction suspension system according to claim 8, characterized in that: A heat dissipation medium is filled between the primary of the linear induction motor and the upper surface of the yoke.

10. The electromagnetic structure of the traction suspension system according to claim 8, characterized in that: The magnetic yoke adopts an integral structure or a split structure; The yoke comprises a main body located in the middle and arms located at both sides of the main body respectively; When the yoke adopts an integral structure, the main body and the left and right arms are connected to form a whole; When the magnetic yoke adopts a split structure, the main body is separated from the left and right arms, and the left and right arms of the magnetic yoke are respectively arranged on both sides of the main body.

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