JPH0677542A - Superconducting switch - Google Patents

Abstract

PURPOSE:To realize almost infinite resistance with a small-sized device, by constituting the contact of an electrode formed of superconductor so as to be mechanically shut and opened. CONSTITUTION:When the title switch is used as a superconducting switch for forming a permanent current circuit, a superconducting electrode 1 for transferring is pushed against the contact of a superconducting electrode 2 for fixing, and a current is made to flow in the superconducting state of zero resistance. When the switch is used as almost infinite resistance, the superconducting electrode 1 for transferring is pulled up and the switch is used in the state that the contact is opened. Since the contact of the electrode is mechanically shut and opened, almost infinite resistace can be obtained with a small-sized device. When super-conducting powder is provided between the contacts, the critical current of the switch is improved, and characteristics are enhanced so that the dimension of a superconducting switch can be made smaller.

Description

Detailed Description of the Invention

[0001]

This invention relates to a superconducting switch, that is, a superconducting coil connected in parallel to
The present invention relates to a superconducting switch forming a permanent current circuit.

[0002]

2. Description of the Prior Art FIG. 5 shows, for example, Japanese Patent Publication No. 51-47599.
FIG. 6 is a cross-sectional view showing a conventional superconducting switch disclosed in Japanese Patent Publication No. In the figure, 11 is a superconducting wire, 12 is an excerpt, 13
Is a heating element, 14 is a heat insulating layer, 15 is a metal layer, and 16 is an insulating layer.

The conventional superconducting switch is constructed as described above, and its operation will be described below. Both ends of the superconducting wire 11 are connected in parallel to the superconducting coil, and the superconducting wire 1
By heating the temperature of 1 by the heating element 13, the temperature is raised to the critical temperature or higher to cause superconducting breakdown to generate resistance. Next, the superconducting coil is excited by a direct current power source connected in parallel to the superconducting coil, and then the temperature of the superconducting wire 11 is set to a critical temperature or lower, thereby bringing the switch into the superconducting state. Next, the current of the DC power supply is reduced to zero, and the circuit is made into a permanent current by the superconducting coil and the superconducting switch.

[0004]

The conventional superconducting switch is constructed as described above. However, in a superconducting switch used for high-speed excitation, etc., it has a larger resistance in the normal conducting state above the critical temperature. Desired. Therefore, metals such as copper and aluminum that are integrated with the superconducting wire for stabilization have to be peeled off because of their low electrical resistance. Moreover, in order to obtain a high resistance value, a very long superconducting wire 11 is required. Must be used, thermal insulation layer 1
When combined with 4 and the excerpt 12, it becomes a considerably large superconducting switch. Furthermore, since there is no stabilizing metal, the stability is poor, and it has been quite difficult to obtain a high resistance superconducting switch.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a superconducting switch having a small size and a high resistance.

[0006]

A superconducting switch according to the present invention is constructed so that the contacts of electrodes formed of a superconductor can be mechanically opened and closed.

Further, a powder superconductor is arranged between the contacts.

[0008]

The contact of the electrode according to the present invention is mechanically opened and closed, so that it is possible to obtain a small size and a resistance almost infinite.

Further, if a powder superconductor is provided between the contacts, the critical current of the switch is improved and the characteristics are improved, so that the size of the superconducting switch can be made smaller.

[0010]

EXAMPLES Example 1. FIG. 1 is a sectional view showing an embodiment of the present invention. In FIG. 1, 1 is a moving superconductor electrode, 2 is a fixing superconductor electrode, and 3 is an insulator.

Next, the operation will be described. When used as a superconducting switch when making a permanent current circuit, the moving superconducting electrode 1 is pressed against the contact point of the fixed superconducting electrode 2 so that the resistance is zero and a current flows. When it is used as an almost infinite resistance, the moving superconductor electrode 1 is pulled up and the contact is opened for use.

Example 2. As shown in FIGS. 2A and 2B in vertical and horizontal sectional views, respectively, it is assumed that the moving electrode 4 and the fixed electrode 5 are composed of a superconducting wire 6 and a metal 7 other than the superconductor. Good. Example 2 shown in FIG.
Then, when the metal 7 other than the superconductor of the moving electrode 4 and the fixed electrode 5 is made of a metal as a stabilizing material, for example, copper, the electrodes work stably even in a magnetic field and are less likely to be broken by superconducting. Therefore, the characteristics as a switch are improved.

Embodiment 3. Further, as shown in FIG. 3, superconductor powder 8 may be put between the contact points of the moving electrode 4 and the fixing electrode 5. In Example 3 shown in FIG. 3, the contact area of the contact is not so much influenced by the roughness of the contact surface of the electrode due to the effect of the powder 8 of the superconductor between the contacts, so that the true contact area can be increased. Therefore, the value of the magnetic field current that can be passed through the electrodes can be increased, so that the characteristics of the switch are improved.

Example 4. The electrodes may be formed into a tape-shaped superconductor 10 as shown in FIG. With such a configuration, the entire switch can be downsized. And the structure becomes simpler.

[0015]

As described above, according to the present invention, the contact of the electrode formed of the superconductor is mechanically opened and closed, so that a small-sized and high-resistance superconducting switch can be obtained.

Further, if a powder superconductor is arranged between the contacts, the critical current of the switch is improved and the characteristics are improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a superconducting switch according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a superconducting switch according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a superconducting switch according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing a superconducting switch according to Embodiment 4 of the present invention.

FIG. 5 is a sectional view showing a conventional superconducting switch.

[Explanation of symbols]

 1 superconducting electrode for moving 2 superconducting electrode for fixing 4 moving electrode 5 fixing electrode 6 superconducting wire 7 metal other than superconductor 8 superconductor powder 10 tape-shaped superconductor

Claims (2)

[Claims] 1. A superconducting switch configured to mechanically open and close a contact of an electrode formed of a superconductor. 2. The superconducting switch according to claim 1, wherein a powder superconductor is arranged between the contacts.