JP2003274507A - Inductive collector coil device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an inductive collector coil device light in weight, and to provide the inductive collector coil device that improves the overall rigidity of a superconductive magnet, by firmly fixing the coil to the outer case surface of the superconductive magnet. <P>SOLUTION: In the inductive collector coil device 6 that is mounted on the outer surface 3 of a low-temperature case for the superconductive magnet for a magnetic-levitation car, a highly elastic material having insulation properties is used for the structural material 3 of the inductive collector coil 5 to make the coil 5 light in weight. This coil 5 and the surface of the outer case 1 of the superconductive coil are fixed firmly. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil device for induction current collection mounted on the surface of an outer tank of a superconducting magnet cryogenic container of a magnetic levitation vehicle.

[0002]

2. Description of the Related Art Conventionally, as a technique in such a field,
There was something like the following.

FIG. 12 is a basic configuration diagram of such a conventional induction current collector, and FIG. 12 (a) is a schematic cross-sectional view thereof.
FIG. 12B is an enlarged view of part A of FIG.

In these figures, 101 is a vehicle and 10 is a vehicle.
2 is a dolly, 103 is a superconducting magnet low temperature container outer tank provided on the dolly 102, 104 is a superconducting coil arranged in the superconducting magnet low temperature container outer tank 103, and 105 is provided on the surface of the superconducting magnet low temperature container outer tank 103. An induction current collecting coil, 106 is a converter for power factor improvement and power control, 107 is a storage battery, 108 is an in-vehicle load, 110 is a track, and 111 is a levitation coil arranged on the track 110.

Here, as shown in FIG. 12B, the moving magnetic field (thick line) generated by the superconducting coil 104 acts on the levitation coil 111 to levitate the vehicle 101. Also,
Harmonic magnetic field (fine wire) generated by the levitation coil 111
Generates velocity electromotive force in the induction current collecting coil 105,
This speed electromotive force causes a current to be generated in the induction current collecting coil 105, but the power control converter 106 controls the power factor and amplitude of the current in the induction current collecting coil 105,
Electric power is supplied to the vehicle interior load 108 and the storage battery 107.

[0006]

However, in the above-described conventional induction current collector, when the induction current collection coil is provided on the surface of the outer tank of the superconducting magnet cryogenic container, the induction current collection coil is provided with a structural material. It was configured to use glass fiber reinforced plastic (GFRP).

Therefore, the induction current collector using GFRP as a structural material has a problem that the weight thereof becomes heavy and the mechanical rigidity of the superconducting magnet cryogenic container outer tank is weakened accordingly.

In view of the above situation, the present invention aims to reduce the weight of the induction current collecting coil and to firmly fix the induction current collecting coil and the surface of the outer tub of the superconducting magnet to thereby improve the overall rigidity of the superconducting magnet. It is an object of the present invention to provide an induction current collecting coil device capable of improving the above.

[0009]

In order to achieve the above object, the present invention provides: [1] a coil device for induction current collection mounted on the surface of an outer tank of a superconducting magnet cryogenic container of a magnetic levitation vehicle. When using a highly elastic material with insulating properties for the structural material of the electricity collecting coil to reduce the weight of the induction collecting coil and to fix it to the induction collecting coil and the superconducting magnet outer tank surface The superconducting magnet has high rigidity.

[2] In the coil device for induction current collection according to the above [1], the structural material of the induction current collection coil is a composite of carbon fiber reinforced plastics having unidirectional fibers. To do.

[3] The induction current collecting coil device according to the above [1], wherein the structural material of the induction current collecting coil is composed of a composite of carbon fiber reinforced plastics sandwiching an insulating sheet. .

[4] In the coil device for induction current collection as described in [3] above, the carbon fiber reinforced plastic is composed of unidirectional fibers.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

Since the iron core cannot be used in the superconducting equipment which generates a high magnetic field, the leakage magnetic flux interlinks with the surrounding metal to cause an eddy current loss. CFRP (Carbon
Fiber Reinforced Plastic)
Has a conductive property in the reinforcing fiber, and when used as a structural material, eddy current may be generated like metal. Efficiency as an electrical device depends on how to reduce loss,
It is important to prevent the generation of eddy current and prevent eddy current loss from increasing by making the structure of carbon reinforced fiber anisotropic or by interposing an insulator.

In the present invention, the CF which prevents the occurrence of eddy current loss
By using RP as a structural material, it is proposed that the rigidity of the superconducting magnet is increased and the induction current collecting capability is not deteriorated.

[Study of AC loss of CFRP material] CFRP fiber constituent CFRP is used as a structural material that requires high rigidity because it is highly elastic and lightweight. It is also applied to electronic parts. When an AC magnetic flux links with such a conductor, eddy current loss (AC loss) occurs. Therefore, when the CFRP is used in a superconducting device, it is necessary to devise it so that the eddy current is reduced.

In order to suppress the eddy current generated, the resistivity of the material itself may be increased or the flow path of the eddy current may be blocked.

From such a viewpoint, a CFRP in which the direction of carbon fibers is changed or an insulating sheet (thin glass sheet) is interposed is proposed.

FIG. 1 schematically shows the structure of CFRP. 1 (a) is an isotropic laminated structure of CFRP, and FIG. 1 (b) is CF.
RP unidirectional laminated structure, FIG. 1C shows a CFRP isotropically arranged laminated composite structure with an insulating sheet sandwiched therebetween, and FIG. 1D shows a CFRP unidirectionally arranged laminated composite structure with an insulating sheet sandwiched therebetween. .

Examination of resistivity A difference in resistance of several hundreds of times occurs in the fiber direction and the fiber orthogonal direction (1) [Kawada et al .: "Latest composite materials and technology overview", Industrial Technology Service Center, pp. 400,
1990].

Examination of eddy current loss As a result of measuring how much the eddy current loss of CFRP is, it was found that the following should be considered.

(1) In isotropic CFRP [FIG. 1 (a)],
An eddy current path is formed because of the contact of carbon fibers between the stacks.

(2) In the unidirectional CFRP [FIG. 1 (b)], the number of contacts between the fibers is large, so that the resistivity is large and the eddy current does not easily flow.

(3) Even if it is isotropic, since an insulating material is sandwiched between the laminated layers, the carbon fibers do not come into contact with each other between the laminated layers and the eddy current does not flow.

Thus, even in CFRP using conductive reinforcing fibers, it is possible to prevent the generation of eddy currents by providing anisotropy in the fiber direction or by interposing an insulator. Therefore, it is possible to manufacture a CFRP with a small eddy current loss by devising a fiber structure.

[When CFRP is applied to the induction current collector] Based on the above results, the induction current collection capability of the superconducting magnetic levitation type railway current collector and the performance of the superconducting magnet were examined.

Structure of Induction Current Collector and Necessity of CFRP As shown in FIG. 2, the induction current collector has a coil device C for current collection mounted on the surface of a superconducting magnet B installed on each trolley A of the vehicle to drive the vehicle. The electric power is obtained from the induced voltage of the current collecting coil due to the harmonic magnetic field from the levitation coil which is generated with the above. The harmonic magnetic field is generated because the levitation coil is concentratedly wound around the traveling path. For example, in a current superconducting magnetic levitation vehicle, the harmonic magnetic field has a frequency that is 6 times the synchronous frequency. If 50
When the vehicle travels at 0 km / h, the frequency reaches about 300 Hz, and therefore the increase in the AC resistance (eddy current loss) of the current collecting coil is larger than that at the commercial frequency. For this reason, in the current collecting coil, in order to suppress an increase in AC resistance as much as possible, measures are taken such as subdividing the wires.

Further, in order to prevent the reduction of the induced voltage due to the AC magnetic shielding effect of the superconducting magnet outer tank, a device such as providing a gap between the superconducting magnet outer tank and the current collecting coil or making them vertically asymmetrical has been made. . In FIG. 2, D is P
It is a WM converter.

Further, as one index showing the performance of the superconducting magnet, there is the heat generation amount of the inner tank. The increase in the amount of heat generated in the inner tank increases the amount of evaporation of liquid helium, which is the refrigerant of the superconducting coil, and becomes a burden on the refrigerator. Therefore, the lower the calorific value of the inner tank, the better. One of the causes of heat generation in the inner tank is that electromagnetic force generated in the outer tank of the superconducting magnet causes vibration of the outer tank, and the vibration of the outer tank serves as an exciting force to cause a twisting motion in the inner tank. This torsional movement of the inner tank causes local friction on the support member and the like, which causes heat generation.

The electromagnetic force is generated by the eddy current generated in the outer tank and the magnetic field from the superconducting coil. In order to suppress the vibration due to this electromagnetic force, it is effective to increase the rigidity of the outer tank.

Since the current collecting coil is firmly fixed to the superconducting magnet outer tank, the current collecting coil is considered to be a structural member of the outer tank. By using CFRP as a current collecting coil structure material, which is lighter and more rigid than GFRP,
It is considered that the rigidity of the current collecting coil is increased and the rigidity of the outer tank can be increased.

Stiffness Evaluation in Structural Analysis Structural calculation was performed on the rigidity of the superconducting magnet outer tank when CFRP was used as the structural material of the current collecting coil. The finite element method was used for the analysis, and each element was approximated by a shell element. Taking the symmetry into consideration, a 1/2 model was used.

FIG. 3 shows the analytical model and Table 1 shows the analytical specifications.

[0034]

[Table 1]

To determine the rigidity of the outer tank, the displacement when a certain load is applied may be compared. Normally, loads are applied in the twisting, vertical and horizontal directions, but here, the electromagnetic force acting on the outer tub when the induction current collector operates in the horizontal direction (Y direction in the figure) is applied as a distributed load as shown in Fig. 3. It was

Eddy currents due to the levitation coil magnetic field and the collecting coil magnetic field are generated in the superconducting magnet outer tank. These eddy currents and the main magnetic flux of the superconducting magnet act on the outer tank with electromagnetic force. However, the electromagnetic force due to the coil eddy current for current collection is
Since it is canceled by the electromagnetic force due to the current collecting current, only the electromagnetic force due to the levitation coil remains, causing vibration in the outer tank.

Since the displacement of the outer tank due to this vibration is related to the evaporation amount, it is possible to compare the changes in the vibration force of the outer tank by giving the actual load distribution. As a result, the displacement at the time of vibration can be known and the increase / decrease of the evaporation amount can be determined.

Therefore, by analysis, C by the electromagnetic force applied to the outer tank (normalized by the maximum electromagnetic force and used as the load condition)
FIG. 4 shows the difference in deformation between the coil using FRP [FIG. 4 (b)] and the coil using GFRP [FIG. 4 (a)]. It can be seen that the applied electromagnetic force causes torsional deformation of the superconducting coil. Comparing the maximum displacement of this torsional deformation, the coil structure material for induction current collection is GFR
In the case of P and the case of CFRP, the rigidity is higher in the case of about 20% CFRP.

Since the current collecting coil is firmly fixed to the surface of the superconducting magnet outer tank, it can be considered as a part of the structural member of the outer tank. Therefore, if the current-collecting coil is highly elastic, the rigidity of the entire outer tank will increase, and if the current-collecting coil can be made highly elastic without lowering the current-collecting capability, the mechanical heat generation of the superconducting magnet will be reduced. Can be realized.

FIG. 5 shows the results of studying the current collection power when CFRP is applied to the coil structure material for induction power collection in each CFRP. In FIG. 5, the horizontal axis represents speed (km / h) and the vertical axis represents output (k / h).
w).

In the calculation, the output per cart is calculated and P
This is a case where the efficiency of the WM converter is 90% and the power factor of 1 is controlled.

As is clear from FIG. 5, the CFRP (curve a) provided with countermeasures against eddy currents has a current collecting capability equivalent to that of the current GFRP, and the required power is generated from about 300 km / h. However, with CFRP (curve b) without countermeasures against eddy currents, the required power cannot be obtained unless the speed is 350 km / h or higher. In this way, CF is high speed
It can be seen that eddy current countermeasures are indispensable because the loss due to RP increases.

In the case of GFRP (measured value ◯ mark), the constant electric power operation is performed when the converter can obtain the required electric power.
A constant output is obtained at 00 km / h or more.

As described above, according to the present invention, CFRPs having different fiber configurations are manufactured, and the AC resistance of the primary coil is measured.
It was confirmed that the same result as the analysis was obtained. From this measurement and analysis, it was found that a material without an increase in eddy current loss can be manufactured by using anisotropic CFRP or CFRP laminated with an insulator.

Based on the above results, the case of using CFRP in the superconducting magnetic levitation railway induction current collector was examined. It has been found that by adopting CFRP as the structural material, the rigidity of the outer tank is higher than that in the case where the current collecting coil having the conventional GFRP as the structural material is used. further,
The electrical characteristics of the inductive current collector were calculated and it was found that the performance of the current collector did not deteriorate. Further, since the weight can be reduced by 30% or more as compared with GFRP, it is considered to be useful for a mobile body such as this system.

[Embodiment] FIG. 6 is a block diagram of an induction current collecting coil device showing a first embodiment of the present invention. FIG. 6A is an exploded sectional view of the induction current collecting coil device. 6 (b) is a cross-sectional view showing a mounted state of the induction current collecting coil device, and FIG. 7 is a configuration diagram of a structural material of the induction current collecting coil showing the first embodiment of the present invention.

As shown in these figures, the surface of the superconducting magnet cryogenic container outer tank 1 in which the superconducting coil 2 is provided is made of the structural material 3 of the present invention, which is a highly elastic material having insulation properties. An induction current collecting coil device 6 is configured. Reference numeral 31 is a ground coil.

In this embodiment, as shown in FIG. 7, a unidirectional carbon fiber reinforced plastic (anisotropic carbon fiber reinforced plastic) 4 is used as the structural material 3. Such an anisotropic carbon fiber reinforced plastic 4 can be integrated with the induction current collecting coil 5 by an adhesive (not shown) to obtain the induction current collecting coil device 6.

FIG. 8 is a block diagram of an induction current collecting coil device showing a second embodiment of the present invention. FIG. 8 (a) is an exploded sectional view of the induction current collecting coil device, and FIG. 8 (b). Is a cross-sectional view showing a mounted state of the induction current collecting coil device, and FIG. 9 is a configuration diagram of a structural material of the induction current collecting coil showing a second embodiment of the present invention.

As shown in these figures, the superconducting magnet cryogenic container outer tank 1 in which the superconducting coil 2 is provided is used for induction current collection by using the structural material 11 which is a highly elastic material having an insulating property. The coil device 15 is configured. Reference numeral 31 is a ground coil.

Therefore, in this embodiment, as shown in FIG. 9, as the structural material 11, here, a composite CFRP composite in which carbon fiber reinforced plastics 12 having different directions are sandwiched between insulating sheets 13 is used. The composite CFRP composite as described above can be integrated with the induction current collecting coil 14 by an adhesive (not shown) to obtain the induction current collecting coil device 15.

FIG. 10 is a block diagram of an induction current collecting coil device showing a third embodiment of the present invention. FIG. 10 (a) is an exploded sectional view of the induction current collecting coil device, and FIG. 10 (b). 11 is a cross-sectional view showing the mounted state of the induction current collecting coil device, FIG.
FIG. 7 is a structural diagram of a structural material of an induction current collecting coil showing a third embodiment of the present invention.

In this embodiment, as shown in these figures, a carbon fiber reinforced plastic composite (anisotropic carbon fiber reinforced plastic) 17 having unidirectionality was sandwiched between insulating sheets 18 as a structural material 16. The CFRP complex is used. Such a composite CFRP composite can be integrated with the induction current collecting coil 19 by an adhesive (not shown) to obtain the induction current collecting coil device 20.

According to the third embodiment, it is possible to improve the eddy current resistance characteristics as compared with the structural material of the second embodiment.

With the above construction, it is possible to obtain an induction current collecting coil device having a structural member made of a highly elastic material which is lightweight, has an insulating property, and has a high mechanical strength.

Furthermore, it is possible to obtain an induction current collecting coil device having improved eddy current resistance.

The present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, which are not excluded from the scope of the present invention.

[0058]

As described in detail above, according to the present invention, the following effects can be achieved.

(A) By using a highly elastic material having an insulating property for the structural material of the induction current collecting coil of the distributed induction current collecting apparatus, the weight of the induction current collecting coil can be reduced, and
By firmly fixing the induction current collecting coil to the superconducting magnet outer tank, it is possible to improve the overall rigidity of the superconducting magnet.

(B) Further, it is possible to suppress the reduction of the induction current collecting ability.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the structure of CFRP used for analysis and testing.

FIG. 2 is a schematic diagram of a distributed induction current collector.

FIG. 3 is a diagram showing a structural analysis model.

FIG. 4 is a diagram showing an analysis result of outer tank rigidity.

FIG. 5 is a current collection power characteristic diagram when CFRP is applied to a coil structure material for induction current collection.

FIG. 6 is a configuration diagram of an induction current collecting coil device according to the first embodiment of the present invention.

FIG. 7 is a structural diagram of a structural member of an induction current collecting coil according to the first embodiment of the present invention.

FIG. 8 is a configuration diagram of an induction current collecting coil device showing a second embodiment of the present invention.

FIG. 9 is a structural diagram of a structural material of an induction current collecting coil showing a second embodiment of the present invention.

FIG. 10 is a configuration diagram of an induction current collecting coil device showing a third embodiment of the present invention.

FIG. 11 is a structural diagram of a structural material of an induction current collecting coil showing a third embodiment of the present invention.

FIG. 12 is a basic configuration diagram of a conventional induction current collector.

[Explanation of symbols]

1 Superconducting Magnet Cryocontainer Outer Tank 2 Superconducting Coil 3,11,16 Structural Material 4,17 which is a highly elastic material with insulating properties Unidirectional CFRP (anisotropic carbon fiber reinforced plastic) RP) 5,14,19 Induction current collecting coil 6,15,20 Induction current collecting coil device 12 Carbon fiber reinforced plastic (CFRP) 13,18 Insulation sheet 31 Ground coil A Cart B Superconducting magnet C Current collecting coil device D PWM converter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiaki Murai             38-8, Hikarimachi, Kokubunji, Tokyo 38 Foundation             Corporate Railway Technical Research Institute (72) Inventor Hitoshi Matsue             38-8, Hikarimachi, Kokubunji, Tokyo 38 Foundation             Corporate Railway Technical Research Institute (72) Inventor Toshihiro Fukagawa             No. 1 state town in Sakaide City, Kagawa Prefecture Mitsubishi Chemical             Sakaide factory (72) Inventor Akihiko Ashiya             1-8-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi             Within Gakusanshi Co., Ltd. F-term (reference) 5H105 AA14 BA01 BB03 CC05 DD10                       EE14                 5H113 BB03 CC04 DA05 DB03 DB14                       DC03 DC14 DD02 EE03

Claims (4)

[Claims] 1. A superconducting magnet for a magnetic levitation vehicle, comprising: a superconducting magnet, which is mounted on the surface of an outer vessel of a cryogenic container, and uses a highly elastic material having an insulating property as a structural material of the induction collecting coil. In addition to reducing the weight of the induction current collecting coil, the superconducting magnet has high rigidity when the induction current collecting coil is fixed to the surface of the outer tank of the superconducting magnet. apparatus. 2. The induction current collecting coil device according to claim 1, wherein the structural material of the induction current collecting coil is a composite of carbon fiber reinforced plastic having unidirectional fibers. Coil device for current collection. 3. The induction current collecting coil device according to claim 1, wherein the structural material of the induction current collecting coil is a composite of carbon fiber reinforced plastics sandwiching an insulating sheet. Electric coil device. 4. The induction current collecting coil device according to claim 3, wherein the carbon fiber reinforced plastic is composed of unidirectional fibers.