JPS6053521B2 - Cooling device for induction coil for non-contact current collection in superconducting magnetic levitation vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for an induction coil for non-contact current collection in a superconducting magnetic levitation vehicle.

Referring to the attached drawing, Figure 1, which shows the relative arrangement of superconducting magnets, induction coils, ground coils, etc. of a general superconducting magnetic levitation vehicle, the relationship and function of these components will be explained. Reference numeral 1 indicates the vehicle body, and 2 indicates the superconducting electromagnet. 3 is a ground coil for levitation, 4 is a ground coil for propulsion guidance, 5 is a damping sheet, 6 is an induction coil, 7 is a non-contact current collector, and the vehicle body 1 is installed along the running route. By applying a propulsion current to the ground coil 4 for propulsion guidance, an electromagnetic force acts between it and the superconducting electromagnet housed in the cryostat 2, and this causes propulsion.
In addition, when the vehicle runs on the levitation ground coil 3 laid along the running route, the levitation ground coil 3
It is suspended and supported by the electromagnetic force acting between the current induced in the superconducting electromagnet and the superconducting electromagnet.

Further, a plurality of induction coils 6 are provided on the lower surface of the vehicle body 1, facing the levitation ground coil 3, in the longitudinal direction of the vehicle body 1, for example.
Although it varies depending on the vehicle specifications, about 30 to 60@I are arranged on one side, and a voltage is induced by harmonic components of the magnetic field caused by the induced current of the levitation ground coil 3. The non-contact current collector 7 is composed of, for example, a rectifier, a battery, an inverter, etc., and uses the induced voltage of the induction coil 6 to generate electric power, for example, for driving a compressor for an on-vehicle refrigerator, a light, etc. (not shown). Provides power to the load. The damping sheet 5 is provided to perform a passive damping function on the vehicle body 1, and is made of a non-magnetic conductive plate such as aluminum. It also has the effect of shielding harmonic components of the magnetic field acting on the superconducting electromagnet from the guiding ground coil 4. A superconducting magnetically levitated vehicle has the general structure and functions as described above, but in the case of a practical-scale vehicle, the power obtained by non-contact current collection is normally about 100 kfR/h at a vehicle speed of 500 kfR/h. , 100-200K
W, and the induction coil 6 for this purpose cannot be made too large due to restrictions such as installation space and weight. Therefore, the current density of the induction coil 6 is, for example, 2 to
I have no choice but to choose 4A/i, which is quite high. On the other hand, when the induction coil 6 is made of aluminum wire, which is advantageous in terms of weight, the current density at which dry self-cooling is possible is generally determined from experience to be no more than Ha/ml.

Therefore, in the case of the induction coil 6 for non-contact current collection, it is necessary to provide forced cooling means such as oil cooling or air cooling. However, considering that as many as 1011 induction coils 6 are arranged in the longitudinal direction of the lower surface of the vehicle body 1 as described above, it is difficult to provide such a forced cooling means.
It is very difficult to install and maintain, and
The drawbacks were that the effective air gap between the lower surface of the vehicle body and the upper surface of the levitation ground coil decreased and the weight of the vehicle increased.

An object of the present invention is to obtain a cooling device for an induction coil for non-contact current collection that eliminates such drawbacks, and for this purpose, the induction coil is thermally reduced to the lowest possible thermal resistance using a damping sheet. The damping sheet is characterized by being attached in contact with each other in a small size, and by using the damping sheet as a heat dissipation fin for the heat generated by the induction coil, it is possible to eliminate the need for special forced cooling means. , the induction coil can be cooled.

Hereinafter, the present invention will be explained based on the attached drawing, FIG. 2, which shows one embodiment of the present invention.

In the figure, reference numeral 10 denotes a damping sheet, which surrounds the cryostat 2 as in the conventional device, and one end of which is extended to the inside of the induction coil 6, and is installed by being sandwiched between the induction coil 6 and the vehicle body 1. It is being

In this case, in order to prevent a gap from forming between the damping sheet 10 and the induction coil 6 and increasing the transmission resistance,
The heat conduction between the induction coil and the damping sheet is made as good as possible by inserting a filling material with a low heat transfer resistance or by bringing them into close contact with each other so as to have a small heat transfer resistance. Note that the parts other than the above are the same as the conventional device.

Since the present invention is configured in this way, the induction coil 6
The heat generated in the damping sheet 10 is quickly transferred to the damping sheet 10 due to the filling or contact surface with low heat transfer resistance.
Furthermore, this damping sheet 10 is attached to cover the bottom surface of the cryostat 2 facing the levitation ground coil 3 and the side surface facing the propulsion guide ground coil 4, and has an extremely large surface area. Since this has the function of a heat dissipation area, heat dissipation is large, and therefore the heat generated in the induction coil can be sufficiently dissipated into the air. ,
Since the induction coil 6 is attached to the side opposite to the superconducting electromagnet with respect to the damping sheet 10 so that the damping sheet shields the superconducting electromagnet, the influence of the AC magnetic field of the induction coil on the superconducting electromagnet, e.g.
It has the effect of reducing adverse effects such as loss, and in particular, it has the effect of sufficiently cooling the induction coil without using forced cooling means.

Although the above embodiment describes the case where a damping sheet is used to cool the induction coil, it is possible to quickly dissipate the heat of the induction coil by bringing the induction coil into thermal contact with the cryostat itself instead of using the damping sheet. Even if the heat is transferred to the cryostat and dissipated by its wide area, the effect is no different from the above embodiment.

Further, in the above embodiment, a case was explained in which the harmonic magnetic field of the ground coil for levitation was used, but the present invention is similar to the case where the harmonic magnetic field of the ground coil for propulsion guidance is used. The effect is also equivalent to the effect of the present invention.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a plane perpendicular to the direction of travel of the vehicle, showing the arrangement relationship between a general magnetic levitation vehicle and its ground coil;
The figure is a cross-sectional view taken along a plane perpendicular to the traveling direction of a vehicle according to an embodiment of the present invention. 1... Vehicle body, 2... Cryostat containing a superconducting electromagnet, 3... Ground coil for levitation, 4... Ground coil for propulsion guide, 5, 10... Damping sheet,
6... Induction coil, 7... Non-contact current collector.

Claims (1)

[Scope of Claims] 1. A cryostat containing a superconducting electromagnet or the cryostat with a damping sheet attached to the outer surface, a non-contact current collector, and its induction coil are provided on the vehicle, and the vehicle is equipped with a cryostat on the vehicle's running path. In a superconducting magnetic levitation vehicle that is levitation supported and propelled and guided by electromagnetic force acting between a levitation ground coil and a propulsion guide ground coil laid along the vehicle and a superconducting electromagnet on the vehicle, the induction coil is
A cooling device for an induction coil for non-contact current collection in a superconducting magnetic levitation vehicle, characterized in that it is attached in contact with the cryostat or damping sheet to reduce heat transfer resistance, and the surface of the cryostat or damping sheet also serves as a heat radiation surface. . 2. Claim 1, in which the induction coil is arranged so that the alternating current magnetic field generated by the induction coil itself is shielded from the superconducting electromagnet by the damping sheet.
A cooling device for an induction coil for non-contact current collection in a superconducting magnetic levitation vehicle as described in 2.