JPH0132750B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to an electromagnet and an armature of a linear induction machine (hereinafter abbreviated as LIM) provided on a vehicle,
Vehicles are supported without contact by electromagnetic attractive force and electromagnetic propulsive force that act between the magnetic rail installed on the track and the secondary conductor and secondary core of the linear induction machine.
This invention relates to a magnetic levitation propulsion device for guiding and propelling an attraction type magnetic levitation railway.

[Prior art and its problems]

FIG. 1 is a sectional view showing an example of the configuration of this type of magnetic levitation railway. In the figure, a vehicle body 1 is attached to a bogie 3 via a spring device 2, and the bogie 3 is provided with a LIM armature 4 for vehicle propulsion, an electromagnet 5 for supporting the vehicle, and an electromagnet 6 for guiding. . A secondary iron core 8a and a secondary conductor 8b of the LIM are attached to both sides of the track 9 facing the LIM armature 4, and magnetic rails 7 that also serve as support and guide are attached to the lower end surfaces of both sides of the track 9. The support electromagnet 5 and the side surface are provided so as to face the guide electromagnet 6. Therefore, by adjusting the excitation current of the supporting electromagnet 5 and the guiding electromagnet 6 of the vehicle and controlling the attractive force acting between the magnetic rail 7 and the supporting electromagnet 5 and the guiding electromagnet 6, the bogie 3 The electromagnetic element 4 and the secondary conductor 8b of the LIM are levitated relative to the track 9 and guided in the left and right direction, and the current of the LIM armature is controlled.
The vehicle is propelled toward the trajectory 9 by the electromagnetic force acting between the vehicle and the vehicle.

This type of levitation propulsion device is compact, lightweight, consumes little power, has sufficient electromagnetic force and electromagnetic spring constant to prevent contact with the track while traveling, and has good ability to follow irregularities in the track. It is desirable that the operating cost be low. Therefore, it is desired that the magnetic rail has less eddy current loss caused by the magnetic flux of the supporting and guiding electromagnets when the vehicle is running, and has low construction and maintenance costs. The system in which the supporting and guiding electromagnets are arranged in convex poles with north and south poles arranged alternately along the traveling direction, as shown in Fig. 1, has a small inductance because the leakage magnetic flux of the electromagnets can be reduced.
This method satisfies the above requirements in that the electromagnet is light in weight and therefore has excellent trajectory followability.

Generally, when this type of magnetically levitated vehicle travels while being magnetically levitated, the magnetic field generated by the supporting electromagnet 5 or the guiding electromagnet 6 causes eddy current loss in the magnetic rail, resulting in magnetic drag. In particular, when using convex pole electromagnets, the pole pitch is generally not large, so in order to reduce this eddy current loss, the magnetic rail is constructed by laminating ferromagnetic plates, or ferromagnetic wires are integrated. It is common to configure it as a

Figure 2 shows an example of a conventional levitation device, in which supporting magnetic dust rails 7 are
a and guide magnetic rail 7b are each constructed by laminating ferromagnetic plates so that the end faces of the ferromagnetic plates face the magnetic poles, and combine them to form a magnetic rail that also serves as support and guide. .

FIG. 3 is an example of a magnetic rail devised by the inventors and currently under application procedure, in which the magnetic rail 7 for supporting and guiding is constructed by integrating ferromagnetic wire rods 7c in a mutually insulated state. This is intended to reduce the eddy current loss generated in the magnetic rail 7 for both the magnetic field generated by the supporting electromagnet 5 and the magnetic field generated by the guiding electromagnet 6.

However, when the magnetic rail 7 has a laminated structure,
The method shown in FIG. 2 requires two types of magnetic rails, one for floating and one for guiding, each with a different stacking direction, and therefore has the disadvantage that the manufacturing cost of the magnetic rail 7 is high. Alternatively, in the configuration shown in Figure 3, in which the wires are integrated, high quality control is required because the wires are entirely dependent on adhesion to integrate them, and insulation is required between the ferromagnetic wires. Since it is necessary, the magnetic resistance in the cross-sectional direction increases,
Therefore, it became necessary to increase the excitation current of the electromagnet, resulting in a drawback that power consumption for levitation increased.

Figure 4 is an example of a levitation device related to the invention of the inventors, which is currently in the application process.
By forming the laminated end faces in the longitudinal direction to be at right angles, one of the end faces faces downward and faces the supporting electromagnet 5, and the other faces sideways and faces the guiding electromagnet 6. magnetic rail 17
It is used for both support and guidance. but
The LIM secondary conductors 8 are installed separately from the magnetic rails 17 on both sides of the track so that the surfaces facing the LIM are perpendicular, and there is room for further improvement in terms of installation costs during construction and maintenance costs. left behind. In addition, the electromagnetic force of LIM has a propulsive force and a vertical force, and in normal operating conditions, the vertical force becomes an attractive force because slippage is small.However, the LIM's attractive force is not used effectively. There was room.

[Purpose of the invention]

This invention was made in view of the above-mentioned situation, and has a simpler structure, less magnetic drag, and an inexpensive support without increasing the magnetic resistance of the magnetic rail.
The purpose of the present invention is to provide a composite magnetic rail that can be used for both guidance and propulsion, and to provide a levitation propulsion device that consumes less energy for support by using the attraction force of the LIM as supporting force.

[Key points of the invention]

In the magnetic levitation propulsion device of the present invention, the magnetic rail section (hereinafter referred to as the dual-purpose magnetic rail section) that serves both as support and guide is a stacked iron core with a trapezoidal cross section whose hypotenuses are orthogonal to each other, and the secondary iron core of the linear induction machine and the secondary The propulsion magnetic rail section is made of a laminated body of conductors, and the secondary core is layered so that it is in close contact with the bottom of the narrow side of the magnetic rail section, creating a composite magnetic rail that serves as an integrated support, guide, and propulsion device. By fixing the trapezoid of this composite magnetic rail to the engaging part formed at the downward corner of the track so that one slope faces downward and the other slope faces sideways, a dual-purpose magnetic The end surfaces of the ferromagnetic plates constituting the rail section are positioned one on the bottom side and the other on the side side to face the magnetic pole surfaces of the supporting electromagnet and the guide electromagnet, respectively, to improve magnetic properties, and to improve the magnetic properties. The LIM armature is placed opposite the surface of the secondary conductor.
The above objective is achieved by configuring the LIM to use its suction force for support.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 5 is a structural diagram of a magnetic levitation propulsion device showing an embodiment of the present invention. In the figure, a dual-purpose magnetic rail section 27 consisting of a stacked iron core with a trapezoidal cross section and a propulsion magnetic rail section 28 consisting of a laminate of a secondary conductor and a secondary iron core are fixed so as to be in close contact with each other.
Composite magnetic rail 20 integrated into a nearly trapezoidal shape
is formed, and is fixed to engaging portions 29a formed on both sides of the track 29 so as to be inclined downward by mounting members such as bolts. In the case of the figure, the cross-sectional shape of the composite magnetic rail 20 is an isosceles trapezoid in which the angle formed by the pair of hypotenuses is a right angle, and the engaging portion 29a is inclined at 45 degrees.As a result, the magnetic rail The lower surface side is horizontal and the side surface side is vertical, and the end surfaces of the ferromagnetic plate of the dual-purpose magnetic rail section 27 are located on the horizontal lower surface side and the vertical side surface, respectively.Therefore, the lower surface side is used for support. If the electromagnets 5 and the guide electromagnets 6 are arranged on the truck 23 so as to face each other, the magnetic flux generated by both electromagnets will enter the magnetic rail from the end face of the ferromagnetic plate and will flow along the laminated surface of the vehicle. Since the magnetic flux circulates between the north and south poles arranged in the direction of travel, the magnetic flux component penetrating the laminated surface is reduced.
It is possible to construct a magnetic rail section that serves both as support and guide with low magnetic resistance and eddy current loss. Furthermore, since the surface of the propulsion magnetic rail section 28 is inclined downward at 45 degrees, if the armature 4 of the LIM is fixed to the inclined engagement section 23a of the pedestal 23 so as to face this surface,
Since the LIM's magnetic attraction force can be used for support, energy consumption for support can be reduced. Note that the cross-sectional shape of the composite magnetic rail 20 does not necessarily have to be an isosceles trapezoid;
The structure may be configured so that a horizontal lower surface and vertical side surfaces can be obtained, including the setting of the inclination angle of a.

FIG. 6 is a structural diagram showing a modification of the embodiment shown in FIG. 5. The difference from FIG. This can be easily handled by changing the arrangement of the left and right equipment in Figure 5.

FIG. 7 is a sectional view of the composite magnetic rail in the embodiment of FIGS. 5 and 6. FIG. In the figure,
The dual-purpose magnetic rail section 27 is a so-called adhesive core in which a laminated core made of a ferromagnetic plate such as a silicon steel plate or a thin iron plate is fixed with resin impregnation or adhesive.
It is formed into a trapezoidal shape so that the lower surface facing the supporting electromagnet 5 and the side surface facing the guiding electromagnet are at right angles to each other, and a ferromagnetic plate such as a thick iron plate is closely attached to one surface in the stacking direction. LIM consisting of
A propulsion magnetic rail section 28 is provided, which is composed of a laminate of a secondary iron core 28a and a LIM secondary conductor 28b made of, for example, an aluminum plate. It is fixed to the formed engaging portion 29a by, for example, a mounting bolt 30. The mounting bolts 30 are preferably coated with an insulating coating to prevent the formation of short circuits. Position the mounting bolt 30 as shown in the diagram.
By placing it outside the surface facing the LIM armature 4, the protruding portion of the bolt can be prevented from affecting the gap length between the armature 4 and the secondary conductor 28b. The dual-purpose magnetic rail section 27 may be manufactured, for example, by cutting a prefabricated laminate into a trapezoidal shape, or by laminating ferromagnetic plates of different widths to form a trapezoidal shape. By configuring the magnetic levitation propulsion device as described above, it is possible to obtain a dual-purpose magnetic rail section 20 that has less magnetic resistance and eddy current loss, and therefore consumes less energy.
The magnetic flux generated in the LIM armature 4 is transferred to the secondary conductor 28b
The flow passes through the secondary core 28a in the traveling direction and circulates back to the armature, generating thrust and supporting force between the magnetic rail 20 and the armature 4, so LIM attraction, which has not been used in the past, is achieved. The force can be effectively used to support the vehicle. In addition, by constructing the secondary core 28a of the LIM with a ferromagnetic plate with high mechanical strength such as a thick iron plate, and fixing it to the track with a mounting member such as a bolt passing through the composite magnetic rail 20, Since the secondary core 28a has the function of a mechanical reinforcing plate, higher reliability can be obtained compared to conventional structures that rely on adhesives for mechanical strength.

FIG. 8 is a sectional view of a composite magnetic rail showing a different embodiment of the present invention, and the differences from FIG. 7 are as follows.
The part of the secondary core 38 of the LIM that faces the armature 4 of the LIM is a stacked core part 38a with good magnetic properties, and the thick iron plate parts 3 with high mechanical strength are on both sides of the stacked core part 38a.
8b, and is configured to reduce eddy current loss in the secondary iron core. The stacked iron core portion 38a is
Ferromagnetic plates such as silicon steel or thin iron plates are stacked in a direction perpendicular to the stacking direction of the dual-purpose magnetic rail 27, and the ferromagnetic plates are fixed to each other with impregnated resin, adhesive, or the like. With this configuration, the armature 4
The magnetic flux generated passes through the secondary conductor 28b and flows in the secondary iron core in the traveling direction along the laminated surface, so
Since the eddy current loss can be expected to be reduced due to the lamination effect, and the iron plate portion 38b has a function as a reinforcing member, a composite magnetic rail with high mechanical reliability can be obtained.

〔Effect of the invention〕

As described above, this invention has a magnetic rail part that serves both as a support and a guide in a laminated structure, and is made of a laminated body of a secondary iron core and a secondary conductor of a linear induction machine in close proximity to one side in the laminated direction. The propulsion magnetic rail sections are stacked and arranged to form a trapezoidal composite magnetic rail for support, guidance, and propulsion whose overall cross section is a trapezoid in which the angle formed by the pair of hypotenuses is at right angles, and one of the pair of hypotenuses is directed downward. It is configured to be attached to engaging portions provided at an angle on both sides of the track so that one side is horizontal and the other side is vertical. As a result, it is possible to provide a composite magnetic rail that is integrated with support, guidance, and propulsion, and it is possible to reduce costs for track construction, magnetic rail installation, maintenance, etc. In addition, in the magnetic rail section that serves both as support and guide, the bottom side facing the support electromagnet and the side side facing the guide electromagnet are both end faces of a common ferromagnetic plate, so the magnetic flux generated by both electromagnets is common. The magnetic flux component that passes through the magnetic rail section along the laminated surface of the ferromagnetic plate and interlinks with the laminated surface is reduced compared to the conventional structure, reducing eddy current loss and magnetic resistance, making it easier for support and guidance. can reduce the power consumed. Furthermore, by arranging the armature of the linear induction machine opposite the downwardly inclined propulsion magnetic rail, the suction force of the linear induction machine, which has not been used in the past, can be used to support the vehicle. By reducing the excitation power of the electromagnet and configuring the linear induction machine's secondary core with a thick iron plate, the secondary core can be expected to play a role as a reinforcing member for the composite magnetic rail, so the strength of the bonded part is expected to increase. It is possible to provide a more reliable magnetic rail than the conventional structure.

[Brief explanation of drawings]

Figure 1 is a structural diagram of a conventional magnetic levitation propulsion system, Figures 2 and 3 are cross-sectional views of a conventional magnetic rail that serves both as support and guide, and Figure 4 is a structural diagram of an improved magnetic levitation propulsion system. 5 is a structural diagram of a magnetic levitation propulsion device showing an embodiment of the present invention, FIG. 6 is a structural diagram showing a modification of the embodiment of FIG. 5, and FIG. 7 is an embodiment of the embodiment of FIGS. 5 and 6. FIG. 8 is a sectional view of a composite magnetic rail showing a different embodiment of the present invention. In the figure, 1...vehicle body, 3, 23, 33...
Cart, 4... Armature of linear induction machine, 5... Support electromagnet, 6... Guide electromagnet, 8a, 28a,
38...Secondary core of linear induction machine, 8b, 28b
... Secondary conductor, 9, 29, 39 ... Orbit, 7, 1
7...Magnetic rail for supporting and guiding, 20...Composite magnetic rail, 27...Magnetic rail section for supporting and guiding, 28...Magnetic rail for propulsion, 29a...
Engaging portion 30 is a bolt.

Claims (1)

[Claims] 1. A support formed by laminating and fixing ferromagnetic plates in the height direction of a trapezoid so that the cross section in the direction perpendicular to the direction of travel of the vehicle has a trapezoid shape in which the angle formed by a pair of hypotenuses is a right angle. A composite consisting of a magnetic rail part that also serves as a guide, and a magnetic rail part for propulsion that is made up of a secondary iron core and a secondary conductor of a linear induction machine, which are laminated and fixed in close contact with the narrow bottom side of this magnetic rail part. A shaped magnetic rail is fixed along the traveling direction of the vehicle to an engaging portion formed at an inclined downward corner of the track so that one oblique side of the trapezoidal cross section is substantially horizontal, and A supporting electromagnet is attached to the lower side of the rail, a guiding electromagnet is attached to the side side of the rail, and a linear induction machine armature is attached to the secondary conductor side of the rail so that they face each other with a predetermined gap between them. A magnetic levitation propulsion device for an attraction-type magnetic levitation railway. 2. In the device according to claim 1,
The propulsion magnetic rail section is composed of a laminate of a secondary core made of a single ferromagnetic plate and a secondary conductor made of a non-magnetic conductor plate, and the secondary iron core is attached to the magnetic rail section that serves both as support and guide. A magnetic levitation propulsion device for an attraction-type magnetic levitation railway, characterized in that a composite magnetic rail is fixed to an engaging portion of a track by bolts penetrating the trapezoid in the height direction so as to be in close contact with each other. 3 In what is stated in claim 2,
Magnetic levitation propulsion of an attraction type magnetic levitation type railway characterized in that the secondary core includes a stacked core portion in which ferromagnetic plates are laminated and fixed in a direction substantially perpendicular to the laminated surface of a magnetic rail portion that serves both as support and guide. Device.