JPH0478316A - Superconducting bearing - Google Patents

Abstract

PURPOSE:To simplify a manufacture design by allowing the intrusionn of the magnetic flux of a permanent magnet, and locating a superconducting bearing at a separated position where a predetermined quantity of the magnetic flux of the permanent magnet intrudes and the distribution of the intruded magnetic flux is evened independently from the rotation of a rotating member. CONSTITUTION:When a rotating shaft 2 is pressed to a superconducting member 1 side to come close to a position with a predetermined distance, most of the magnetic flux generated from the rotating shaft 2 intrude inside of the superconducting member 1. At this stage, since superconducting particles exist evenly inside of the superconducting member 1, the distribution of the magnetic flux intruded inside of the superconducting member 1 becomes constant, and as if the rotating shaft 2 is stuck by a virtual pin stood in the superconducting member 1, and the rotating shaft 2 is restricted against the superconducting member 1. The rotating shaft 2 is therefore supported under the extremely stable floated condition. Under the condition that the magnetic flux of the rotating shaft 2 intrudes the superconducting member 1, the rotating shaft 2 is stably rotated for support with the centrifugal work.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a superconducting bearing using a superconductor that allows magnetic flux penetration.

<Prior art> As a superconducting bearing, for example, Japanese Patent Application Laid-Open No. 63-243523
There is something like the one shown in the publication.

The superconducting bearing disclosed in this publication uses a type 1 superconductor, that is, a superconductor that completely blocks magnetic flux penetration, and utilizes the perfect diamagnetic phenomenon of the superconductor. In this superconducting bearing, both ends of a rotating shaft made of a superconductor are placed in recesses of a pair of supporting members made of a magnetic material with one magnetic pole, respectively, and the rotating shaft is moved in the axial and radial directions without contact. It is configured to support.

<Problems to be Solved by the Invention> By the way, as mentioned above, in the conventional superconducting bearing, since the non-contact support is performed using the property of complete diamagnetic property, the direction perpendicular to the direction of repulsion is unstable. Therefore, it is necessary to process the support member that supports both ends of the rotating shaft into a shape that wraps around both ends of the rotating shaft, and also to process the parts that face each other in the axial and radial directions between both ends of the rotating shaft and the supporting member. It was necessary to magnetize the material, making the manufacturing design complicated.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a superconducting bearing that has a simple configuration and can stably support rotation.

<Means for Solving the Problems> In order to achieve the above object, the present invention has the following configuration.

The superconducting bearing of the present invention includes a permanent magnet provided in a rotating body and a superconductor disposed opposite to the permanent magnet, wherein the permanent magnet has a magnetic flux distribution with respect to the rotational axis of the rotating body. The superconductor is one that allows the magnetic flux of the permanent magnet to enter, and is located at a spaced apart position where a predetermined amount of the magnetic flux of the permanent magnet enters, and that the superconductor is constantly uniform around the rotational axis. It is characterized in that it is placed at a position where the distribution of penetrating magnetic flux is uniform regardless of the magnetic flux.

<Function> According to the above configuration, the permanent magnet and the superconductor are held in a state where they face each other with a predetermined spacing due to the restraining effect of the magnetic flux of the permanent magnet that has entered the superconductor. In this state, it is possible to rotate the rotating body including the permanent magnet around its axis. At this time, the magnetic flux that has entered the superconductor does not become a resistance that impedes rotation as long as the magnetic flux distribution is uniform and unchanged with respect to the rotation axis.

In other words, according to the configuration of the present invention, by simply arranging the permanent magnets included in the rotating body at predetermined positions relative to the superconductor, it is possible to support the rotating body in a non-contact manner in the axial and radial directions. There is no need to provide a recess in the supporting superconductor to wrap around the end of the rotating body.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a first embodiment of the present invention. In the figure, ■ is a flat superconductor, and 2 is a rotating shaft made of a cylindrical permanent magnet.

Superconductor I is a yttrium-based high-temperature superconductor, such as Y
It is made of a substrate made of B az Cuz OX with normal conductive particles (Yz Ba+ Cut OX) evenly mixed inside it, and has the property of restraining the intrusion of magnetic flux emitted from a permanent magnet.

The rotating shaft 2 has one magnetic pole (N pole or S pole) magnetized at the negative shaft end and the other magnetic pole (S pole or N pole) magnetized at the other shaft end, and has a rotating body and a permanent magnet. It is a combination of

Then, the rotating shaft 2 is opposed above the upper surface of the superconductor 1 placed in a horizontal position so that its central axis is parallel to the longitudinal direction of the superconductor 1. Note that if the rotating shaft 2 is simply placed on the superconductor 1, the magnetic flux of the rotating shaft 2 will only slightly penetrate into the superconductor 1.
The support state is unstable, as it only floats up due to the repulsive force caused by the Meissner effect.

From this state, when the rotating shaft 2 is pushed toward the superconductor 1 and brought closer to a predetermined distance, most of the magnetic flux emitted from the rotating shaft 2 will enter the inside of the superconductor 1 (
trap phenomenon). Here, since normal conductive particles are uniformly mixed inside the superconductor 1, the distribution of the magnetic flux entering the inside of the superconductor 1 is constant, and therefore, it is as if the superconductor 1 were placed vertically. The rotating shaft 2 appears to be penetrated by the virtual pin, and the rotating shaft 2 is restrained with respect to the superconductor 1. Therefore, the rotating shaft 2 is supported in an extremely stable floating state.

In this non-contact supported state, when the rotating shaft 2 is rotated around its axis, the magnetic flux penetrating the superconductor 1 does not cause rotational resistance, and there is no frictional resistance as in sliding bearings or rolling bearings. Although it is supposed to continue rotating forever, it will eventually stop due to the effects of air resistance and geomagnetism. However, these rotational resistances are very small for bearings and can be almost ignored.

By the way, when the rotating shaft 2 is lightly pushed in one direction in the above-mentioned non-contact supported state, the rotating shaft 2 is once displaced in the pushed direction, but then displaced from that position to the original position.
After repeating this pendulum movement for a while, it returns to its original position and stops. However, if the rotating shaft 2 is strongly pushed in one direction, the rotating shaft 2 moves from the initial position to the pushed position and stops. In other words, when the magnetic flux of the rotating shaft 2 enters the inside of the superconductor 1 and the distribution of the penetrating magnetic flux becomes constant, the relative position between the superconductor 1 and the rotating shaft 2 is determined, and they are restrained at that position. will be done. Such a phenomenon is caused by the so-called pinning force peculiar to the superconductor 1 having the above structure.

As explained above, if the magnetic flux of the rotating shaft 2 is allowed to penetrate into the superconductor 1, the rotating shaft 2 will always be stably rotationally supported with a centripetal action.

FIG. 2 shows a second embodiment of the invention. In this embodiment, an example is given in which the rotating shaft 2 is parallel to the vertical direction so that its axis is perpendicular to the longitudinal direction of the superconductor 1.

In this embodiment as well, the rotating shaft 2 is supported floating above the superconductor 1, similar to the first embodiment.

In each of the above embodiments, the superconductor 1 and the rotating shaft 2 are arranged upside down, that is, the rotating shaft 2 is arranged below the bottom surface of the superconductor 1, and the rotating shaft 2 is If the rotating shaft 2 is brought closer to the 1 side, the rotating shaft 2 is held in a floating state as if suspended. Furthermore, if the superconductor 1 is placed in an oblique position and the rotary shaft 2 is opposed to each other with a predetermined distance in the same manner as described above, the rotary shaft 2 is also supported in an oblique position in a floating manner.

<Effects of the Invention> As explained above, according to the superconducting bearing of the present invention, there is no need for extra processing on the superconductor or permanent magnet in order to provide non-contact support in the axial and radial directions as in the conventional bearing. This simplifies the manufacturing design, as it eliminates the need for Moreover, the posture of the rotating body to be supported without contact is not particularly limited, and it can be installed in a narrow space, making it possible to use it in ways that would be unimaginable for bearings used in boats, especially for equipment in space. It is effective for use in bearings for linear motor cars and linear motor cars.

[Brief explanation of the drawing]

FIG. 1 is a side view of a superconducting bearing according to a first embodiment of the present invention, and FIG. 2 is a side view of a superconducting bearing according to a second embodiment of the present invention.

Claims (1)

[Claims] (1) A superconducting bearing consisting of a permanent magnet provided in a rotating body and a superconductor disposed opposite to the permanent magnet, wherein the permanent magnet has a magnetic flux distribution with respect to the rotation axis of the rotating body such that the magnetic flux distribution is centered on the rotation axis. The superconductor allows the magnetic flux of the permanent magnet to enter the superconductor, and the superconductor allows the magnetic flux of the permanent magnet to enter at a spaced position where a predetermined amount of the magnetic flux of the permanent magnet enters, regardless of the rotation of the rotating body. A superconducting bearing characterized in that it is arranged at a position where the distribution of penetrating magnetic flux is uniform.