JP3191014B2 - Magnetic coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic coupling.

[0002]

2. Description of the Related Art As a magnetic coupling, a shaft-shaped second coupling member is coaxially inserted into the center of a hollow first coupling member so as to be relatively rotatable, and opposing peripheral surfaces of these two coupling members. Are provided with a plurality of sets of permanent magnets, each of which is opposed to each other, and a rotating force is transmitted by the attraction of the permanent magnets of each set of permanent magnets.

[0003]

However, in the case of the conventional magnetic coupling as described above, the arrangement of the permanent magnets in the permanent magnet device is complicated and expensive.

[0004] Although rotational force can be transmitted, it is difficult to transmit axial driving force.

An object of the present invention is to solve the above problems,
An object of the present invention is to provide a magnetic coupling having a simple structure and capable of transmitting rotational force and axial driving force.

[0006]

SUMMARY OF THE INVENTION A magnetic coupling according to the present invention is provided with a first coupling member having a superconductor capable of penetrating a magnetic flux and trapping the magnetic flux, and a distance between the first coupling member and the superconductor which the magnetic flux can penetrate. Are arranged at equal intervals in the circumferential direction so as to face the superconductor, and each has magnetic poles at both ends in the axial direction.
A second joint member having a plurality of permanent magnets that, Ri Do and a cooling device for cooling the superconductor, the superconductor cooling instrumentation
Permanent magnet by cooling in
Magnetic flux penetrates into the superconductor and traps
A shall have been made so as to motion.

[0007]

The superconductor of the first joint member is cooled by a cooling device.
By maintaining the superconducting state, a plurality of
The magnetic flux of the permanent magnet penetrates and traps inside the superconductor
During operation , most of the magnetic fluxes of the plurality of permanent magnets of the second joint member enter the superconductor of the first joint member and are trapped during operation. Then, the first joint member and the second joint member are mutually held in the axial direction and the radial direction in a state where the first joint member and the second joint member face each other at a predetermined interval due to the restraining action of the magnetic flux trapped by entering the superconductor. A plurality of permanent magnets having magnetic poles at both ends in the axial direction are arranged at equal intervals in the circumferential direction on the second joint member, and the magnetic flux density changes in the circumferential direction, so the magnetic flux trapped in the superconductor Is the relative rotational resistance of the two joint members. Therefore, when one of the joint members is rotated, the other is also rotated, and the rotational force can be transmitted from one to the other. The magnetic flux trapped in the superconductor is 2
When one of the joint members is moved in the axial direction, the other is also moved in the axial direction, so that one of the joint members moves in the axial direction in addition to the rotational force. It is also possible to transmit force.

The first joint member does not require a permanent magnet,
Since the first joint member and the second joint member are held together in the axial direction and the radial direction, a guide mechanism between the two joint members is unnecessary.

[0009] Since the first joint member and the second joint member are held in a spaced state, there is no need to increase their precision so much.

[0010]

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

As shown in FIGS. 1 and 2, the magnetic joint comprises a thick cylindrical first joint member (1) and a cylindrical shaft-shaped second joint member inserted coaxially with a gap at the center thereof. Joint member
And (2).

A cylindrical superconductor (3) is attached to the inner peripheral surface of the first joint member (1), and the first joint member (1) is provided with a cooling member for cooling the superconductor (3). Device (4) is connected. The superconductor (3) is composed of a substrate made of an yttrium-based high-temperature superconductor, for example, YBa ₂ Cu ₃ O _{x, in} which normal conducting particles (Y ₂ Ba ₁ Cu ₁ ) are uniformly mixed in a substrate. It has the property of invading and trapping (restraining) it.

A permanent magnet (5), which is long in the axial direction, is attached to four places which equally divide the outer peripheral surface of the second joint member (2) in the circumferential direction. These permanent magnets (5) have magnetic poles at both ends in the longitudinal direction, and the magnetic poles at the same end have magnetism of the same polarity. That is, the end of the permanent magnet (5) at one end of the second joint member (2) has an N pole, and the end of the permanent magnet (5) at the other end of the second joint member (2) has an S pole. ing. In addition, permanent magnet
(5) is disposed so as to face the superconductor (3) at a distance where the magnetic flux can enter the superconductor (3) of the first joint member (1).

When operating the above magnetic coupling, the superconductor (3) is cooled by the cooling device (4) and is kept in a superconductive state. Therefore, the permanent magnet of the second joint member (2)
Most of the magnetic flux emitted from (5) enters the superconductor (3) of the first joint member (1) and is trapped. Here, since the superconductor (3) has normal conductor particles uniformly mixed therein, the distribution of the magnetic flux penetrating into the superconductor (3) becomes constant, so that it is as if the superconductor
The permanent magnet (5) penetrates the virtual pin set up in (3), and the permanent magnet (5) is restrained by the superconductor (3). Therefore, the two joint members (1) and (2) are mutually supported in the axial direction and the radial direction while being extremely stably levitated from each other.

A plurality of permanent magnets (5) surround the second joint member (2).
Are arranged at equal intervals in the
Magnetic flux trapped in the superconductor (3)
Is the relative rotational resistance of the two joint members (1) and (2).
You. This magnetic flux is applied to the axis of the two joint members (1) and (2).
It also becomes a resistance to relative movement in the direction. For this reason, for example, when the first joint member (1) is on the driving side and the second joint member (2) is on the driven side, the first joint member (1) is rotated by appropriate means, so that the second joint member (1) is rotated. (2) also rotates and moves the first joint member (1) in the axial direction, so that the second joint member (2) also moves in the axial direction.

Conversely, when the second joint member (2) is on the drive side and the first joint member (1) is on the driven side, the second joint member (2) is rotated by appropriate means to thereby provide the first joint member (2). The member (1) also rotates, and the first joint member (1) also moves in the axial direction by moving the second joint member (2) in the axial direction.

In the above embodiment, the superconductor (3) on the inner peripheral surface of the first joint member (1) and the second conductor inserted into the first joint member (1) are used.
The permanent magnet (5) on the outer peripheral surface of the joint member (2) is opposed in the radial direction, but as shown in FIGS.
The end surface of the joint member (1) and the end surface of the second joint member (2) face each other, a superconductor (3) is provided on the end surface of the first joint member (1), and the end surface of the second joint member (2) is provided. Second joint member (2) on the end face
A plurality of permanent magnets (5) having magnetic poles at both ends in the axial direction are provided so that the magnetic poles at the same end are alternately reversed, and the superconductor (3) and the permanent magnet (5) are axially moved. You may make it oppose.

In the embodiment shown in FIGS. 3 and 4, especially when used in a clean environment or in a vacuum, taking into consideration the generation of dust from the driving portion and the support portion of the coupling member, for example, FIG. As shown, the second joint member (2) can be installed and used in the chamber (6).

In this case, the superconductor (3) of the first joint member (1) is cooled in liquid nitrogen (7) in advance, and the permanent magnet (5) of the second joint member (2) shown in FIG. The magnet is magnetized at a distance x with the same material as above to trap magnetic flux. Meanwhile, the chamber
In (6), the superconductor (3) of the first joint member (1) is opposed to the permanent magnet (5) of the second joint member (2) temporarily placed on the support base (8). 1 Horizontal drive mechanism for the joint member (1)
When approaching the second joint member (2) in (A), the permanent magnet (5) is attracted by the magnetic flux trapped in the superconductor (3), and the distance x between them is automatically maintained. When the first joint member (1) is rotationally driven by the motor (D) or the like, the rotational driving force is transmitted to the second joint member (2), as in the above embodiment, to rotate. Also, by appropriately driving the vertical drive mechanism (B), the axial position of the second joint member (2) in the chamber (6) can be arbitrarily adjusted.

[0020]

According to the magnetic joint of the present invention, as described above, the driving force in the axial direction in addition to the rotational force is generated by the restraining action of the magnetic flux that has entered the superconductor of the first joint member and is trapped. It can be transmitted reliably .

Further, the first joint member does not require a permanent magnet, does not require a guide mechanism between the two joint members, and does not require high accuracy for the two joint members. It is simple, simple and inexpensive.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a magnetic coupling according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a longitudinal sectional view of a magnetic coupling according to another embodiment of the present invention.

FIG. 4 is a view taken along line IV-IV in FIG. 3;

FIG. 5 is a longitudinal sectional view of a magnetic coupling device showing still another embodiment of the present invention.

[Explanation of symbols]

 (1) First joint member (2) Second joint member (3) Superconductor (5) Permanent magnet

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-231954 (JP, A) JP-A 64-26025 (JP, A) JP-A 64-32488 (JP, U)

Claims (1)

(57) [Claims] 1. A first joint member having a superconductor capable of penetrating a magnetic flux and trapping the same, and a first joint member circumferentially opposed to the superconductor at a distance such that the magnetic flux can penetrate the superconductor. The magnets are placed at equal intervals on both ends in the axial direction.
A second joint member having a plurality of permanent magnets having poles, Ri Do and a cooling device for cooling the superconductors, superconductors
Is cooled by a cooling device to maintain the superconducting state.
The magnetic flux of the permanent magnet penetrates and traps inside the superconductor
Magnetic coupling that has been adapted to actuate the after.