A suspended train driven by a linear motor and with hybrid electromagnetic weight reduction

Abstract

The invention discloses a suspended train driven by a linear motor and with hybrid electromagnetic weight reduction, comprising a carriage and two or more bogies mounted inside the carriage, wherein two adjacent bogies are respectively connected to a connecting plate through a rotating shaft; a linear motor secondary aluminum plate is arranged below the carriage top plate, and a linear motor primary is arranged above the connecting plate; a hybrid weight reduction electromagnet and a hybrid weight reduction electromagnet air gap sensor are arranged above each bogie; an axle is arranged below each bogie, and wheels are respectively mounted at both ends of the axle; a car body is also suspended below each bogie through a connecting rod; and a hybrid weight reduction electromagnet controller and a linear motor controller are also arranged inside the bogie. The invention has the beneficial effect that it can effectively reduce the energy consumption of the system, reduce the operating cost of the system, and effectively improve the performance of the suspended train.

Description

Technical Field

[0001] The present invention relates to the field of rail transit technology, and in particular to a suspended train driven by a linear motor and with hybrid electromagnetic weight reduction. Background Art

[0002] The suspended floating weight-reducing train is a new type of rail transit tool. As a kind of urban rail transit, it is a good supplement to the existing urban transportation system. It has low construction cost, small building area, and can be used in a short time. Based on the above advantages, in urban transportation, the current three-dimensional transportation is mostly elevated interchanges, and the suspended floating train has a significant effect on three-dimensional transportation. The suspended train method meets such requirements and can serve urban transportation well.

[0003] At present, since suspended trains belong to the ranks of urban transportation, noise reduction will be carried out, so most of them use rubber wheels to travel. In actual operation, the only contact between the wheel and the track will bear the entire load of the train. The traction is achieved by the friction between the wheel circumference and the ground. The greater the gravity, the greater the friction of the wheel, the more serious the wear of the wheel will be, and the maintenance and operation costs will increase. Its traction method adopts the electric transmission traction method. The traditional traction method provides traction through the friction between the wheel circumference and the track, which has a maximum adhesion limit. Summary of the invention

[0004] The object of the present invention is to provide a suspended train driven by a linear motor and with hybrid electromagnetic weight reduction.

[0005] The technical solution for achieving the purpose of the present invention is:

[0006] A suspended train with linear motor drive and hybrid electromagnetic weight reduction, comprising a car body and two or more bogies mounted inside the car body, wherein two adjacent bogies are respectively connected to a connecting plate via a rotating shaft; a linear motor secondary aluminum plate is arranged below the car body top plate, and a linear motor primary is arranged above the connecting plate; a hybrid weight reduction electromagnet and a hybrid weight reduction electromagnet air gap sensor are arranged above each bogie; an axle is arranged below each bogie, and wheels are respectively mounted at both ends of the axle; a car body is also suspended below each bogie via a connecting rod; and also includes a hybrid weight reduction electromagnet controller and a linear motor controller arranged inside the bogie.

[0007] Furthermore, the left and right sides of the bogie or the connecting plate are respectively provided with guide electromagnets and guide electromagnet gap sensors, and also include a guide electromagnet controller arranged inside the bogie.

[0008] The beneficial effects of the present invention are that it can effectively reduce the energy consumption of the system, reduce the operating cost of the system, and effectively improve the performance of the suspended train. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a side view of the overall structure of the system.

[0010] Figure 2 It is a front view of the overall structure of the system.

[0011] Figure 3 It is a cross-sectional schematic diagram of a hybrid weight-reducing electromagnet.

[0012] Figure 4 It is a schematic diagram of bogie connection.

[0013] Figure 5 It is a schematic diagram of a linear motor.

[0014] Figure 6 It is a schematic diagram of the guide electromagnet.

[0015] Marked in the figure are: hybrid weight-reducing electromagnet 100, hybrid weight-reducing electromagnet controller 101, hybrid weight-reducing electromagnet air gap sensor 102, hybrid weight-reducing electromagnet permanent magnet 103, hybrid weight-reducing electromagnet pole 104, hybrid weight-reducing electromagnet enameled wire package 105, linear motor primary 200, linear motor secondary aluminum plate 201, linear motor controller 202, linear motor primary winding 203, linear motor primary core 204, guide electromagnet 300, guide electromagnet controller 301, guide electromagnet gap sensor 302, guide electromagnet pole 303, guide electromagnet enameled wire package 304, track surface 3, car body 4, bogie 5, wheel 6, car body 7, rotating shaft 8 and connecting plate 9. DETAILED DESCRIPTION

[0016] In magnetic levitation transportation, zero contact between the train and the track is achieved through magnetic levitation. The present invention draws on magnetic levitation to reduce the positive pressure between the rubber wheel and the track through suspension weight reduction, thereby reducing the mechanical impact and friction resistance on the rubber wheel and increasing the service life of the rubber wheel. It is suitable for low-speed transportation. The present invention also adopts a linear motor drive method.

[0017] The specific embodiments are as follows:

[0018] like Figure 1As shown, the system includes a hybrid weight reduction electromagnet 100, a hybrid weight reduction electromagnet air gap sensor 102 and a hybrid weight reduction electromagnet controller 101. Among them, the hybrid weight reduction electromagnet 100 is fixed on the upper part of the bogie 5 of the suspension train, and has a certain gap with the top and side of the car body 4, and the distance of the side should be selected to be an appropriate distance to prevent magnetic leakage on the side, and to apply magnetic attraction to the top of the car body 4 as much as possible to offset gravity. The hybrid weight reduction electromagnet air gap sensor 102 is installed at a position flush with the electromagnet magnetic pole to detect the distance between the magnetic pole and the upper part of the car body. The primary 200 of the linear motor is installed on the upper part of the connecting plate 9 between the two bogies 5, and the secondary aluminum plate 201 of the linear motor is installed on the car body at a position directly above the primary. The guide electromagnet 300 is located on the side of the bogie 5 or the connecting plate 9, and the guide electromagnet gap sensor 302 is also located here. The hybrid weight reduction electromagnet controller 101, the linear motor controller 202 and the guide electromagnet controller 301 are in the controller compartment.

[0019] Above the primary 200 of the linear motor is the secondary aluminum plate 201 of the linear motor, and the width of the secondary aluminum plate should be greater than that of the primary. The linear motor and the hybrid weight-reducing electromagnet 100 should be distributed alternately. While meeting the weight reduction requirement, the stator should be as long as possible to reduce the end effect of the motor. The guide electromagnet 300 is installed on the side of the bogie 5 or the connecting plate 9, and takes effect when the bogie 5 touches the car body 4. At the same time, in order to avoid the collision between the hybrid weight-reducing electromagnet and the car body 4, a hybrid weight-reducing electromagnet air gap sensor 102 is installed at the position where the magnetic poles of the hybrid weight-reducing electromagnet 100 are flush.

[0020] The front view of the train is as follows Figure 2 As shown, the hybrid weight-reducing electromagnet 100 and the linear motor are located in the same direction and are distributed alternately.

[0021] The composition of the hybrid weight-reducing electromagnet 100 is as follows: Figure 3 As shown. The hybrid weight-reducing electromagnet 100 consists of three parts, including a permanent magnet, a magnetic pole, and a wire package composed of enameled copper wire. The magnetic pole is in a "mountain shape", and the permanent magnet is located in the center of the mountain shape. The magnetic pole in the center of the mountain shape is shorter than the magnetic poles at both ends, which is due to the influence of the secondary aluminum plate 201 of the linear motor. The permanent magnet can provide suction all the time and reduce the electromagnetic suction. However, the volume of the permanent magnet should be calculated according to the weight of the vehicle body.

[0022] The significance of the hybrid weight-reducing electromagnet is to reduce the pressure of the car body and the entire train structure on the track surface. It is specifically divided into two ways. One is the fixed weight-reduction method. Since the structure of the present invention adopts a hybrid weight-reduction method, the permanent magnet structure will provide a part of the fixed suction force. In the same way, a fixed current is passed through the electromagnetic structure, which will produce a fixed suction force. The advantage of this is that the control method is simple and relatively stable, and is not affected by external factors such as speed. Specifically, under a fixed current, the hybrid weight-reducing electromagnet generates a fixed electromagnetic suction force, which is coupled with the car body to generate a pulling force of the car body on the hybrid weight-reducing electromagnet. The car body is connected to the ground through a mechanical structure, and the electromagnet is located on the bogie of the train, and the bogie is connected to the train. Thereby reducing the pressure of the car body on the track surface. Secondly, the controller of the hybrid electromagnet incorporates the speed factor. At different speeds, through simulation with the traction curve, different currents are passed at different speeds to provide electromagnetic suction.

[0023] The traditional electric traction method generates traction through the friction between the wheel circumference and the ground, which is subject to adhesion limitations. The drive method using a linear motor will get rid of the limitation, and the drive method is simpler. Specifically, the structure of the present invention adopts a short stator induction linear motor. The movement mode of the induction linear motor is to change the rotational motion of the traditional asynchronous motor into a linear motion. In order to reduce the influence of the end effect of the linear motor, a longer linear motor stator structure is used as much as possible. The stator of the linear motor is located on the connecting plate between the bogies, and its length is equivalent to the connecting plate. The secondary of the linear motor is fixedly installed with an aluminum plate at a position above the car body parallel to the primary of the linear motor. The fixing device of the linear motor adopts a mechanical decoupling method, and its specific implementation method is as follows. Figure 4 As shown, the connecting plate 9 is located between the bogies 5 to connect the two bogies, and the rotating shaft 8 realizes mechanical decoupling, which is beneficial to the turning of the train. That is, when encountering a route with a certain curvature, the linear motor cannot be deformed due to its own structure, and mechanical decoupling is realized through the mechanical structure between the bogies. The traction structure of the traditional electric traction train is complicated, and the structure of the linear motor is conducive to simplifying the traction structure.

[0024] The spatial structure of the linear motor primary and the hybrid electromagnet in the direction of train operation adopts a phase distribution method, that is, after meeting the weight reduction requirements of the train, the spatial length of the stator is maintained as much as possible. After the hybrid electromagnet is reduced in weight, the positive pressure of the train on the track surface is reduced, and the friction resistance will be reduced. When the linear motor is driven, the work done to overcome the resistance is reduced.

[0025] The characteristics of the present invention are that it can effectively reduce the burden on the rubber wheel, extend the service life of the rubber wheel, reduce the maintenance workload, and improve the driving mode, changing the previous traditional electric transmission traction mode to a linear motor drive mode, no longer restricted by the adhesion of traditional electric traction, and is more convenient in operation.

[0026] The above description has explained the composition of each system of the present invention and the spatial position of its placement. The working mode of the system is described in detail below. First, the hybrid weight reduction electromagnet 100 outputs a fixed current at the startup stage. Such a current is determined by the weight reduction electromagnet air gap sensor 102 and the weight reduction mass, that is, the weight reduction mass is determined by the control plus the feedforward control. Secondly, the force point of the train is kept on the track surface according to the result of the mechanical installation, and real-time air gap feedback is added. The two are combined into one, and the weight reduction electromagnet controller 101 completes the above work. When the system weight reduction is completed, the drive system of the train is changed to the linear motor primary 200 and the linear motor secondary 201. The linear motor current is completed by the linear motor controller 202 according to the required speed. When turning, it is completed by the steering electromagnet 300 system. The steering electromagnet air gap sensor 302 detects the distance between the train and the side wall of the car body to control the train turning. At the same time, due to the special situation of the installation of the linear motor of this structure, mechanical decoupling will be performed when turning.

[0027] like Figure 3 , the parameters of the hybrid weight-reducing electromagnet are 650mm long, 200 wide, 50mm magnetic poles on both sides, and 100mm long for the middle permanent magnet. The length of the magnetic poles on both sides is 200mm, the cross-sectional size of the copper wire filled in the electromagnet wire package is 100mm*100mm, and the filling rate of the copper wire in the electromagnet is 60%. The air gap is 8mm, and the current passing through per square millimeter is 0A, 0.4A, 0.6A, 0.8A, 1A, 1.2A, and 1.4A respectively. . The parameters of the linear motor are: the core width of the asynchronous short stator linear motor is 220mm, the pole pitch is 216mm, the number of motor poles is 8, the motor length is 11604mm, the number of slots per pole per phase is 3, the total number of slots is 80, the air gap magnetic density is 0.18T, the equivalent air gap is 19.28mm, the winding material is copper, and the core is made of silicon steel sheet. The cross-sectional dimensions of the guide electromagnet are 150mm*150mm, the pole plate thickness is 15mm, the length is 600mm, the material is Q235, the wire package material is copper, the filling rate is 0.6, and the working air gap is 6mm. Through finite element simulation analysis, it is found that under these weight reduction currents, the electromagnetic attraction between the weight reduction electromagnet and the weight reduction rail is shown in the table below.

[0028]

[0029] Assuming the linear motor parameters and guide electromagnetic parameters, the finite element simulation results are as follows:

[0030] Asynchronous short stator linear motor 30825N thrust.

[0031] The guiding force of the guiding electromagnet is 15344N.

[0032] From the parameters in the above table, we can know that permanent magnet can provide a force of 1029.49Kg. The use of hybrid electromagnets can save energy reasonably. By giving the electromagnets a fixed current, a fixed force can be obtained. A linear motor can be used as a drive during operation.

[0033] In summary, the present invention can effectively reduce the energy consumption of the system, reduce the operating cost of the system, and effectively improve the performance of the suspended train.

Claims

1. A suspended train driven by a linear motor and hybrid electromagnetic weight reduction, characterized in that: The invention comprises a car body (4) and two or more bogies (5) mounted inside the car body (4), wherein two adjacent bogies (5) are connected to a connecting plate (9) via a rotating shaft (8); a linear motor secondary aluminum plate (201) is arranged below the top plate of the car body (4), and a linear motor primary (200) is arranged above the connecting plate (9); a hybrid weight reduction electromagnet (100) and a hybrid weight reduction electromagnet air gap sensor (102) are arranged above each bogie (5); a wheel axle is arranged below each bogie (5), and wheels (6) are mounted at both ends of the wheel axle; a car body (7) is also suspended below each bogie (5) via a connecting rod; and the invention also comprises a hybrid weight reduction electromagnet controller (101) and a linear motor controller (202) arranged inside the bogie (5).

2. A linear motor driven and hybrid electromagnetic weight reduction suspended train as claimed in claim 1, characterized in that: A guide electromagnet (300) and a guide electromagnet gap sensor (302) are respectively arranged on the left and right sides of the bogie (5) or the connecting plate (9), and also includes a guide electromagnet controller (301) arranged inside the bogie (5).

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