Short primary linear driving electromagnetic suspension system and application

Abstract

The invention discloses a short primary linear driving electromagnetic suspension system which comprises a suspension frame and a track beam which are oppositely arranged, and a cavity is defined by the suspension frame and the track beam so as to install a magnetic conductive track, a linear motor primary, a linear motor secondary and an electromagnet. The electromagnets are positioned on two sides of the linear motor primary and are positioned on the vehicle body side; the magnetic conductive track and the linear motor secondary are located on the track side together, laid below the track beam and located above the linear motor primary and the electromagnet. In the short primary linear driving electromagnetic suspension system, the primary winding of the linear motor does not need to provide exciting current and is excited by the permanent magnet, the secondary winding does not have eddy current loss of an induction plate, and the motor efficiency is high. The linear motor can generate suspension force, the linear motor and the electromagnet jointly bear the suspension function of the maglev train, the electromagnet only needs to bear part of suspension load, temperature rise is low, and the suspension capacity of the system is high. The system does not need a water cooling device, and is simple in structure, light in weight and low in cost.

Description

Technical Field

[0001] The invention relates to a short primary linear drive electromagnetic suspension system and application thereof, belonging to the technical field of magnetic suspension. Background Art

[0002] The maglev train is a new type of ground transportation system in which the body of the train is suspended in the air, which is different from the traditional wheel-rail train. It has the characteristics of low noise, smooth and comfortable ride, strong climbing ability, small turning radius, less line space and low construction cost. It has important application prospects in the fields of urban rail transit and tourism.

[0003] As the core component of the maglev train, the linear drive electromagnetic suspension system is particularly important in terms of low loss / high efficiency, low cost, light system weight, and strong suspension capability.

[0004] In the prior art, Figure 1 As shown, the short primary linear drive electromagnetic suspension system is composed of a linear motor primary (2'), a linear motor secondary (3'), an electromagnet (5'), a magnetic guide rail (1'), and a water cooling device (4'). The linear motor is a linear induction motor, and the electromagnet is an electromagnetic suspension electromagnet.

[0005] The primary of the linear induction motor is composed of an iron core, windings, and structural parts, and the secondary is a composite secondary composed of copper or aluminum plates and steel plates. The electromagnet is composed of a coil and a yoke, and the magnetic track is made of stacked steel plates.

[0006] The electromagnets are located on both sides of the primary of the linear induction motor and are also located on the vehicle body side; the magnetic track is located on the track side together with the secondary of the linear motor and is located above the primary of the linear motor and the electromagnet; the water cooling device is located between the primary of the linear motor and the electromagnet yoke.

[0007] The magnetic track and the electromagnet form an electromagnetic loop to provide levitation force for the maglev train; the primary of the linear induction motor is energized to generate a traveling wave magnetic field, which interacts with the secondary of the linear motor to provide traction for the maglev train. The water cooling device provides heat dissipation for the linear induction motor and the electromagnet.

[0008] Disadvantages of existing technology: 1) The secondary of the linear induction motor is excited by the primary, the primary excitation loss is large, and there is eddy current loss in the secondary induction plate, the motor efficiency is low and the temperature rises.

[0009] 2) The electromagnet bears a large load, consumes a lot of suspension energy, and increases the temperature.

[0010] 3) Natural air cooling cannot meet the heat dissipation requirements of linear induction motors and electromagnets, and the water cooling device configured in the system will increase costs.

[0011] CN202010347075.2 discloses a magnetic suspension transmission system, including a suspension electromagnet module, a suspension transmission module, a traction controller, a suspension controller, and a linear motor. At least four suspension electromagnets correspond to one suspension transmission module, and the arrangement of the suspension electromagnet modules constitutes a "transmission line". The mounting base of the suspension electromagnet cooperates with the I-shaped structure of the suspension transmission module to ensure that the suspension transmission module will not derail, and the linear motor is arranged in the middle of the transmission line. This technology does not solve the above-mentioned problems.

[0012] Therefore, a new structure of a high-efficiency short-primary linear drive electromagnetic suspension system is proposed and applied in different scenarios, which has great practical significance and economic value for actual production. Summary of the invention

[0013] In view of the deficiencies in the above-mentioned prior art, the present invention discloses a short primary linear drive electromagnetic suspension system, which solves the problems of low motor efficiency and increased temperature caused by large primary excitation loss of the linear induction motor and large eddy current loss of the secondary induction plate through structural design; solves the problems of large load borne by the electromagnet, large suspension energy consumption and increased temperature; solves the problem that natural air cooling cannot meet the heat dissipation requirements of the linear induction motor and the electromagnet, and the water cooling device configured in the system will increase the cost.

[0014] In order to achieve the above object, the technical solution adopted by the present invention is: Disclosed is a short primary linear drive electromagnetic suspension system, comprising a suspension frame and a track beam which are arranged opposite to each other, wherein the suspension frame and the track beam enclose a cavity for installing a magnetic track, a linear motor primary, a linear motor secondary and an electromagnet; the electromagnet is located on both sides of the linear motor primary and on a vehicle body side; the magnetic track and the linear motor secondary are located on the track side, laid under the track beam, and above the linear motor primary and the electromagnet.

[0015] The short primary linear drive electromagnetic suspension system of the present invention is a new structure. The system adopts a flux switching linear motor instead of a linear induction motor. It can not only solve the problems of high loss and low efficiency of the existing short primary linear drive electromagnetic suspension system, but also utilize the suspension force between the primary and secondary of the linear motor to reduce the suspension loss and energy consumption of the electromagnet; the water cooling device is eliminated, which effectively reduces the total weight of the system and reduces the system cost.

[0016] Furthermore, the magnetic track is a structure with a concave middle and convex edges; the concave part of the magnetic track is installed with a secondary of a linear motor. The magnetic track and the electromagnet form an electromagnetic loop to provide partial suspension force for the maglev train; the primary of the linear motor is energized to generate a traveling wave magnetic field, which interacts with the secondary of the linear motor to provide traction and partial suspension force for the maglev train; the electromagnet and the linear motor together assume the suspension function.

[0017] Furthermore, an electromagnet yoke is laid on one side of the suspension frame close to the track beam, and a primary of a linear motor and an electromagnet are arranged on the electromagnet yoke.

[0018] Furthermore, the primary of the linear motor is arranged opposite to the secondary of the linear motor. When the primary of the linear motor is energized, a traveling wave magnetic field is generated, which interacts with the secondary of the linear motor to provide traction and partial suspension force for the maglev train.

[0019] Furthermore, the primary of the linear motor includes a U-shaped iron core, windings, and permanent magnets; the secondary of the linear motor is a salient pole structure magnetic secondary. The linear motor can generate a suspension force and jointly undertake the suspension function of the maglev train with the electromagnet. The electromagnet only needs to bear part of the suspension load, the temperature rise is low, and the system has a strong suspension ability.

[0020] Furthermore, the U-shaped iron core, the winding is a concentrated winding, and the polarities of adjacent permanent magnets are opposite.

[0021] Furthermore, the secondary of the linear motor is close to one side of the U-shaped iron core, and a separation groove is arranged at intervals, and an inverted conical boss is arranged on both sides of the separation groove; the inverted conical boss is arranged opposite to the permanent magnet gap. In the high-efficiency short-primary linear drive electromagnetic suspension system proposed by the present invention, the primary winding of the linear motor does not need to provide excitation current, and is excited by the permanent magnet, and the secondary has no eddy current loss of the induction plate, and the motor efficiency is high.

[0022] The short primary linear drive electromagnetic suspension system proposed in the present invention can be applied to a variety of long-stroke track structure scenarios, and has the characteristics of traction and suspension integration. (1) Vehicle body wrapped track structure scenario; (2) Track wrapped vehicle body structure scenario; (3) Pipeline structure scenario. The application field is wide.

[0023] Another object of the present invention is to disclose the application of the above-mentioned short primary linear drive electromagnetic suspension system, which is applied to a car body track-wrapped structure, including a track beam with a T-shaped cross-section installed at the bottom of the train body, the track beam with a T-shaped cross-section including a transverse frame and a vertical frame perpendicular to the transverse frame; the suspension frame is an inverted trapezoidal structure, half-enclosed by the outer edge of the track beam; a cavity is enclosed between the bottom of the suspension frame and the track beam to install a magnetic track, a linear motor primary, a linear motor secondary and an electromagnet.

[0024] Another object of the present invention is to disclose the application of the above-mentioned short primary linear drive electromagnetic suspension system, which is applied to a track-wrapped car body structure, including a suspension frame with a variable cross-section installed at the bottom of the train body, the suspension frame including a transverse frame 2 and a vertical frame 2 connected to the transverse frame 2, the vertical frame 2 being a convex structure; the track beam is a rectangular structure, half-surrounded by the outer edge of the suspension frame; a cavity is enclosed between the track beam and the suspension frame to install a magnetic track, a linear motor primary, a linear motor secondary and an electromagnet.

[0025] Another object of the present invention is to disclose the application of the above-mentioned short primary linear drive electromagnetic suspension system, which is applied to a pipeline structure, including a pipeline and a train body arranged inside the pipeline, wherein the bottom of the train body is provided with support wheels, and a cavity is enclosed between the top of the train body and the inner wall of the pipeline to install a magnetic track, a linear motor primary, a linear motor secondary and an electromagnet.

[0026] Compared with the prior art, the present invention has the following beneficial effects: The short primary linear drive electromagnetic suspension system disclosed in the present invention uses a linear motor that is excited by a primary permanent magnet, has low excitation loss, has no secondary induction plate, has no induction plate eddy current loss, has high motor efficiency and low temperature rise; In the short primary linear drive electromagnetic suspension system disclosed by the present invention, the linear motor shares the load of the electromagnet, the energy consumption of the electromagnet suspension is reduced, the temperature rise is low, and the suspension capacity is increased.

[0027] The short primary linear drive electromagnetic suspension system disclosed by the present invention can meet the heat dissipation requirements of the linear motor and the electromagnet by natural air cooling, does not require a water cooling device, and reduces the system weight and cost.

[0028] The short primary linear drive electromagnetic suspension system disclosed by the present invention has a linear motor secondary that is a magnetic secondary of a salient pole core, has a simple structure, and has a low long stroke arrangement cost.

[0029] The short primary linear drive electromagnetic suspension system disclosed by the present invention has small influence of the longitudinal end effect of the linear motor and high speed.

[0030] In the short primary linear drive electromagnetic suspension system disclosed by the present invention, the inverted conical boss of the secondary of the linear motor can be used as a speed sensor speed measurement reference without the need for additional installation, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the linear drive electromagnetic suspension system of an embedded maglev train in the prior art.

[0032] Figure 2 It is a schematic structural diagram of the short primary linear drive electromagnetic suspension system described in the present invention.

[0033] Figure 3 This is a schematic diagram of the linear motor structure of the short primary linear drive electromagnetic suspension system described in the present invention.

[0034] Figure 4 This is a schematic diagram of the track-wrapped structure of the short primary linear drive electromagnetic system described in Example 2.

[0035] Figure 5 This is a schematic diagram of the track-enclosed vehicle structure of the short primary linear drive electromagnetic system described in Example 3.

[0036] Figure 6 This is a schematic diagram of the pipeline structure of the short primary linear drive electromagnetic system described in Example 4.

[0037] Among them, 1-linear motor secondary, 11-partition groove, 12-inverted conical boss, 2-track beam, 21-transverse frame one, 22-vertical frame one, 3-magnetic track, 4-electromagnet, 5-linear motor primary, 52-permanent magnet, 53-winding, 54-U-shaped iron core, 6-electromagnet yoke, 7-suspension frame, 71-vertical frame two, 72-transverse frame two, 100-pipeline, 200-train body, 300-support wheel. DETAILED DESCRIPTION

[0038] For the convenience of explaining and understanding the present invention, the following Figure 1-6 The embodiments of the present invention are described in detail. Example 1

[0039] like Figure 2-Figure 3 As shown, the short primary linear drive electromagnetic suspension system of this embodiment includes a suspension frame 7 and a track beam 2 arranged relatively to each other, and the suspension frame 7 and the track beam 2 enclose a cavity to install the magnetic track 3, the linear motor primary 5, the linear motor secondary 1 and the electromagnet 4; the electromagnet 4 is located on both sides of the linear motor primary 5 and is located together on the vehicle body side; the magnetic track 3 and the linear motor secondary 1 are located on the track side together, laid under the track beam 2, and are located above the linear motor primary 5 and the electromagnet 4. The magnetic track 3 in this embodiment is a structure with a concave middle and a convex edge; this embodiment is preferably a rectangular groove, and the linear motor secondary 1 is installed in the center of the rectangular groove. At the same time, an electromagnet yoke 6 is laid on the side of the suspension frame 7 close to the track beam 2, and the linear motor primary 5 and the electromagnet 4 are arranged on the electromagnet yoke 6. The linear motor primary 5 and the linear motor secondary 1 are arranged with a relative gap, and the linear motor primary 5 is energized to generate a traveling wave magnetic field, which interacts with the linear motor secondary 1 to provide traction and partial suspension force for the maglev train. The electromagnet 4 is arranged opposite to the magnetic track 3, and a gap is reserved between the electromagnet 4 and the magnetic track 3. Preferably, the gap between the linear motor secondary 1 and the linear motor primary 5 is equal to the gap between the electromagnet 4 and the magnetic track 3.

[0040] The primary 5 of the linear motor includes a U-shaped iron core 54, a winding 53, and a permanent magnet 52; the secondary 1 of the linear motor is a salient pole structure magnetic secondary. In this embodiment, the primary of the linear motor is composed of a U-shaped iron core (stacked sheets), a winding (concentrated winding), a permanent magnet (adjacent permanent magnets have opposite polarities), and a structural member, and the secondary is a salient pole structure magnetic secondary. The electromagnet is composed of a coil, a yoke, or a coil, a yoke, and a permanent magnet, and the magnetic track is formed by stacking steel plates. The secondary 1 of the linear motor is close to one side of the U-shaped iron core 54, and a separation groove 11 is arranged at intervals, and an inverted conical boss 12 is arranged on both sides of the separation groove 11; the inverted conical boss 12 is arranged relative to the gap between the permanent magnet 52. The inverted conical boss 12 of the secondary of the linear motor can be used as a speed sensor speed measurement reference without the need for additional installation, thereby reducing costs.

[0041] The magnetic track 3 and the electromagnet 4 form an electromagnetic circuit, providing partial suspension force for the maglev train; the primary of the linear motor 5 is energized to generate a traveling wave magnetic field, which interacts with the secondary of the linear motor 1 to provide traction and partial suspension force for the maglev train; the electromagnet and the linear motor jointly assume the suspension function.

[0042] The linear motor of this embodiment is excited by a primary permanent magnet, with low excitation loss, no secondary induction plate, no eddy current loss of the induction plate, high motor efficiency and low temperature rise; the linear motor shares the electromagnet load, the electromagnet suspension energy consumption is reduced, the temperature rise is low, and the suspension capacity is increased. Natural air cooling can meet the heat dissipation requirements of the linear motor and the electromagnet, and no water cooling device is required, which reduces the weight of the system and the cost. It solves the problem that natural air cooling cannot meet the heat dissipation requirements of the linear induction motor and the electromagnet, and the water cooling device configured in the system will increase the cost. Example 2

[0043] like Figure 4 As shown, the application of the short primary linear drive electromagnetic suspension system of this embodiment is applied to the body-wrapped track structure of medium and low speed maglev, including a track beam 2 with a T-shaped cross section installed at the bottom of the train body, and the track beam 2 with a T-shaped cross section includes a transverse frame 21 and a vertical frame 22 perpendicular to the transverse frame 21; the suspension frame 7 is an inverted trapezoidal structure, half surrounded by the outer edge of the track beam 2; a cavity is enclosed between the bottom of the suspension frame 7 and the track beam 2 to install the magnetic track 3, the linear motor primary 5, the linear motor secondary 1 and the electromagnet 4.

[0044] The T-shaped cross-section suspension frame 7 in this embodiment is an inverted trapezoidal structure with an open bottom. The bottom surface of the inverted T-shaped structure overlaps with a portion of the transverse frame 21 to form an installation position for installing a short primary linear drive electromagnetic suspension system. The spacing of the overlapping parts is adjusted according to the gap between the linear motor secondary 1 and the linear motor primary 5 and the gap between the electromagnet 4 and the magnetic track 3. Example 3

[0045] like Figure 5As shown, the short primary linear drive electromagnetic suspension system of this embodiment is applied to the embedded track-wrapped vehicle body structure, including a suspension frame 7 with a variable cross-section installed at the bottom of the train body, the suspension frame 7 includes a transverse frame 72 and a vertical frame 71 connected to the transverse frame 72, and the vertical frame 71 is a convex structure; the track beam 2 is a rectangular structure, half surrounded by the outer edge of the suspension frame 7; a cavity is enclosed between the track beam 2 and the suspension frame 7 to install the magnetic track 3, the linear motor primary 5, the linear motor secondary 1 and the electromagnet 4.

[0046] The track beam 2 of this embodiment is a rectangular frame structure with an open top, and its open end extends in the direction of the vertical frame 71, and overlaps with the longitudinal part of the horizontal frame 72. The spacing of the overlapping parts is adjusted according to the gap between the linear motor secondary 1 and the linear motor primary 5 and the gap between the electromagnet 4 and the magnetic track 3.

[0047] The vertical frame 2 71 is a convex structure, and the train body is suspended above the track beam 2. A short primary linear drive electromagnetic suspension system is used to improve efficiency. The primary winding of the linear motor does not need to provide excitation current, and is excited by permanent magnets. The secondary has no eddy current loss of the induction plate, and the motor efficiency is high. Example 4

[0048] like Figure 6 As shown, the short primary linear drive electromagnetic suspension system of this embodiment is applied to a pipeline structure, including a pipeline 100 and a train body 200 arranged inside the pipeline 100, a support wheel 300 is arranged at the bottom of the train body 200, and a cavity is enclosed between the top of the train body 200 and the inner wall of the pipeline 100 to install a magnetic track 3, a linear motor primary 5, a linear motor secondary 1 and an electromagnet 4.

[0049] This system uses a flux switching linear motor instead of a linear induction motor, which not only solves the problems of high loss and low efficiency of the existing short primary linear drive electromagnetic suspension system, but also utilizes the suspension force between the primary and secondary of the linear motor to reduce the suspension loss and energy consumption of the electromagnet; the water cooling device is eliminated, effectively reducing the total weight of the system and reducing the system cost.

[0050] The above are only embodiments of the present invention. The invention is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the content of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A short primary linear drive electromagnetic suspension system, characterized in that: The invention comprises a suspension frame (7) and a track beam (2) which are arranged opposite to each other, wherein the suspension frame (7) and the track beam (2) enclose a cavity for mounting a magnetic track (3), a linear motor primary (5), a linear motor secondary (1) and an electromagnet (4); the electromagnet (4) is located on both sides of the linear motor primary (5) and together with the vehicle body; the magnetic track (3) and the linear motor secondary (1) are located together with the track side, laid below the track beam (2) and above the linear motor primary (5) and the electromagnet (4).

2. The short primary linear drive electromagnetic suspension system according to claim 1, characterized in that: The magnetic conductive track (3) is a structure with a concave middle portion and convex edges; a linear motor secondary (1) is installed in the concave portion of the magnetic conductive track (3).

3. The short primary linear drive electromagnetic suspension system according to claim 2, characterized in that: An electromagnet yoke (6) is laid on one side of the suspension frame (7) close to the track beam (2), and a linear motor primary (5) and an electromagnet (4) are arranged on the electromagnet yoke (6).

4. The short primary linear drive electromagnetic suspension system according to claim 3, characterized in that: The linear motor primary (5) and the linear motor secondary (1) are arranged opposite to each other. When the linear motor primary (5) is energized, a traveling wave magnetic field is generated, which interacts with the linear motor secondary (1) to provide traction and part of the suspension force for the magnetic levitation train.

5. The short primary linear drive electromagnetic suspension system according to claim 4, characterized in that: The primary of the linear motor (5) comprises a U-shaped iron core (54), a winding (53), and a permanent magnet (52); the secondary of the linear motor (1) is a salient pole structure magnetic secondary.

6. The short primary linear drive electromagnetic suspension system according to claim 5, characterized in that: The winding (53) is a concentrated winding, and the polarities of adjacent permanent magnets (52) are opposite.

7. The short primary linear drive electromagnetic suspension system according to claim 6, characterized in that: A separation groove (11) is arranged at intervals on one side of the linear motor secondary (1) close to the U-shaped iron core (54), and an inverted cone-shaped boss (12) is arranged on both sides of the separation groove (11); the inverted cone-shaped boss (12) and the permanent magnet (52) are arranged opposite to each other with a gap therebetween.

8. An application of the short primary linear drive electromagnetic suspension system according to any one of claims 1 to 7, characterized in that: The invention is applied to a vehicle body track-wrapped structure, comprising a track beam (2) with a T-shaped cross section installed at the bottom of a train body, wherein the track beam (2) with a T-shaped cross section comprises a transverse frame (21) and a vertical frame (22) perpendicular to the transverse frame (21); the suspension frame (7) is an inverted trapezoidal structure, half-enclosing the outer edge of the track beam (2); a cavity is enclosed between the bottom of the suspension frame (7) and the track beam (2) to install a magnetic track (3), a linear motor primary (5), a linear motor secondary (1) and an electromagnet (4).

9. A short primary linear drive electromagnetic suspension system according to any one of claims 1 to 7, characterized in that: The invention is applied to a rail-wrapped vehicle body structure, comprising a suspension frame (7) installed at the bottom of a train body, the suspension frame (7) comprising a second transverse frame (72) and a second vertical frame (71) connected to the second transverse frame (72), the second vertical frame (71) being a convex structure; the track beam (2) being a rectangular structure, half-enclosed by the outer edge of the suspension frame (7); a cavity is enclosed between the track beam (2) and the suspension frame (7) for installing a magnetic track (3), a linear motor primary (5), a linear motor secondary (1) and an electromagnet (4).

10. A short primary linear drive electromagnetic suspension system according to any one of claims 1 to 7, characterized in that: The invention is applied to a pipeline structure, comprising a pipeline (100) and a train body (200) arranged inside the pipeline (100), wherein a support wheel (300) is arranged at the bottom of the train body (200), and a cavity is enclosed between the top of the train body (200) and the inner wall of the pipeline (100) for installing a magnetic track (3), a linear motor primary (5), a linear motor secondary (1) and an electromagnet (4).

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