JP2003340254A - Noncontact rotary apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noncontact rotary apparatus capable of obtaining a pin stopping force the nature of which is capturing a magnetic field and capable of obtaining a stable magnetic levitation even if a big rotary torque is enforced between a high-temperature superconductor and a magnetically levitating magnet. <P>SOLUTION: The noncontact rotary apparatus, consisting of a freezer 11, the high-temperature superconductor 14 which is provided with a pin stopping point 20 and is refrigerated by the freezer 11, the magnetically levitating magnet 16 which is separated from the high-temperature superconductor 14 and is magnetically levitated, a driven magnet 18 which is rotated with the magnetically levitating magnet 16, and a driving magnet 19 which gives rotation by magnetic force and being separated from the driven magnet 18, is provided with a ferromagnetic body 13 which guides a magnetic force from the magnetically levitating magnet 16 to the pin stopping point 20 of the high-temperature superconductor 14 when magnetizing the high-temperature superconductor, and the ferromagnetic body is arranged at an opposite position to the magnetically levitating magnet 16 and at a position sandwiching the high-temperature superconductor 14 between the magnet 16. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact rotating device capable of non-contact rotation or non-contact stirring by utilizing the pinning force of a high temperature superconductor.

[0002]

2. Description of the Related Art As a prior art relating to the present invention, Japanese Patent Laid-Open No.
There is a non-contact rotating device 100 disclosed in Japanese Patent Publication No. 000-12430. Conventional non-contact rotating device 10 of FIG.
0 is a freezing unit 102 in a vacuum chamber 101 that blocks heat transfer.
A magnetic levitation magnet 104, a magnetic levitation magnet 104, and a driven magnet 105 are provided by arranging a high temperature superconductor 103 capable of freezing.
Driven magnet 1 having a stirring blade and a rotating shaft 106 for connecting
And 05 as a non-contact rotary unit 109, and the non-contact rotary unit 1
09 is floated by the pinning force of the high temperature superconductor 103, and the driving magnet 107 is rotated by the driving source 107 to drive the driven magnet 10.
5 is rotated by a magnetic force, and when the non-contact rotating part is displaced due to an environmental change during rotation, the displacement sensor 111,
A signal can be sent from 112 to the displacement control means 113 to control it, and the posture can be maintained.

[0003]

However, in the conventional non-contact rotating device 100, the line of magnetic force from the magnetic levitation magnet 104 has a sufficient pinning point 105 which is a non-superconducting phase in the high temperature superconductor 103 as shown in FIG. There was a problem that could not be captured. If the lines of magnetic force from the magnetic levitation magnet 104 cannot be sufficiently captured at the pinning point 105, the pinning force that is a property of capturing a magnetic field when a large rotational torque acts between the high temperature superconductor 103 and the magnetic levitation magnet 104. Is not sufficiently obtained, and there is a problem that stable ascent cannot be achieved.

According to the present invention, even when a large rotating torque is applied between the high temperature superconductor 103 and the magnetic levitation magnet 104,
Sufficient pinning force, which is the property of capturing the magnetic field, is obtained,
An object of the present invention is to provide a non-contact rotating device capable of stable magnetic levitation.

[0005]

According to the invention of claim 1 for solving the above-mentioned problems, "a cooling means, a high temperature superconductor having pinning points and cooled by the cooling means, and a high temperature superconductor, A magnetic levitation magnet which is separated and magnetically levitated, a driven magnet which rotates integrally with the magnetic levitation magnet, and a drive magnet which is separated from the driven magnet and is rotated by a magnetic force.
In the non-contact rotating device, the magnetic field assisting member for guiding the magnetic force line from the magnetic levitation magnet to the pinning point of the high temperature superconductor at the time of magnetizing the high temperature superconductor, It is arranged at a position facing the levitation magnet and sandwiching the high temperature superconductor. ”

According to the first aspect of the present invention, the magnetic field auxiliary member for guiding the magnetic field lines from the magnetic levitation magnet to the pinning point of the high temperature superconductor at the time of magnetizing the high temperature superconductor faces the magnetic levitation magnet and faces the high temperature superconductor. By arranging the body at a position sandwiching it, most of the magnetic lines of force from the magnetic levitation magnet are captured and stored at the pinning points of the high temperature superconductor. When most of the lines of magnetic force were captured and stored at the pinning points of the high-temperature superconductor, the pinning force between the magnetic levitation magnet and the high-temperature superconductor improved, and a large rotational torque worked between the high-temperature superconductor and the magnetic levitation magnet. In this case, stable magnetic levitation is possible.

A second aspect of the present invention for solving the above problems.
Is characterized in that the magnetic field assisting member is a ferromagnetic material or an electromagnet.

In the invention of claim 2, the magnetic field assisting member is a ferromagnetic material or an electromagnet. Since the ferromagnetic material or electromagnet guides the magnetic field lines from the magnetic levitation magnet to the pinning point of the high temperature superconductor, by arranging the ferromagnetic material or electromagnet at a position facing the magnetic levitation magnet and sandwiching the high temperature superconductor, Stable magnetic levitation is possible.

A third aspect of the present invention for solving the above problems.
The invention of "is characterized in that the ferromagnetic material is a permanent magnet or a soft magnetic material."

In the invention of claim 3, the ferromagnetic material is a permanent magnet or a soft magnetic material. As the permanent magnet, Sm-Co,
Nd-Fe-B and Sm-Fe-N can be used, and as the soft magnetic material, permendur (Fe-50Co-2
V), electromagnetic soft iron (Fe), silicon steel (Fe-3Si),
Iron-aluminum (Fe-3.5Al), sendust (Fe-
9.5Si-5.5Al), Metaglass 2605SC
(Fe-3B-2Si-0.5C), 2605S2 (F
e-3B-5Si) can be used.

A fourth aspect for solving the above problems.
The present invention is characterized in that "the cooling means is a refrigerator, and the refrigerator is provided with a cold head for cooling the high temperature superconductor".

According to the fourth aspect of the invention, a refrigerator provided with a cold head as the refrigerating means is used. Cold head
The magnetic field assisting member is in thermal contact with the high temperature superconductor, and the cold from the cold head is transferred to the high temperature superconductor. As the refrigerator, a GM refrigerator, a pulse tube refrigerator, a Stirling refrigerator or the like capable of cooling a high temperature superconductor to a superconducting transition temperature or lower can be used. By using a refrigerator as the cooling means, it becomes possible to obtain a continuous pinning force.

A fifth aspect for solving the above problems.
The present invention is characterized in that "the magnetic field assisting member, the high temperature superconductor and the cold head are internally provided in a heat insulating container".

According to the invention of claim 5, the magnetic field assisting member, the high temperature superconductor and the cold head are provided in the heat insulating container, whereby the high temperature superconductor can be efficiently cooled to the superconducting transition temperature or lower. When the inside of the heat insulating container is evacuated, heat can be prevented from entering due to heat transfer from the outside to the high temperature superconductor, and the heat insulating container can prevent heat from entering due to radiation to the high temperature superconductor. Preventing heat from entering the high-temperature superconductor can reduce the operating load of the refrigerator.

Further, claim 6 for solving the problem is
"The high temperature superconductor is manufactured by a melting method, the main component is RE-Ba-Cu-O, and RE is Y, La, Nd,
Sm, Eu, Gd, Er, YbDy, Ho is a combination of at least one kind or two kinds or more ”.

In the sixth aspect of the invention, it is preferable that the high-temperature superconductor is an RE-Ba-Cu-O-based superconductor produced by a melting method. The RE-Ba-Cu-O-based superconductor synthesized by the melting method in which the material is once heated to a temperature equal to or higher than the melting point and then melted and solidified again has coarse crystal grains, and the insulating phase is finely dispersed in the matrix that becomes superconducting. Have an organization. Since this insulating phase acts as a pinning point, a superconductor having a strong pinning force is obtained, and the performance as a non-contact rotating device is improved.

Further, claim 7 for solving the problem is
"The high-temperature superconductor contains Ag, Au, Pt,
It includes at least one or more types of Ce ”.

In the invention of claim 7, the high temperature superconductor is A
It is preferable to contain at least one kind of g, Au, Pt, and Ce. Ag and Au precipitate in the superconducting matrix without reacting with the superconducting phase, and improve the mechanical strength of the ceramic superconductor without impairing the superconducting properties such as the superconducting transition temperature. Therefore, the reliability of the non-contact rotating device is improved. In the superconductor containing Pt and Ce, the insulating phase is finely dispersed in the superconducting phase which is the mother phase,
It shows stronger pinning force. Therefore, the performance as a non-contact rotating device is improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a non-contact rotating device of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 shows a non-contact rotating device of the present invention, which is a refrigerator 11 as a refrigerating means, a cold head 12 provided in the refrigerator 11 for generating cold, a cold head 12 and heat. Ferromagnetic material 13 which is a magnetic field assisting member in contact, and high temperature superconductor 14 in thermal contact with ferromagnetic material 13.
A heat insulating container 15 in which a cold head 12, a ferromagnetic material 13 and a high temperature superconductor 14 are installed, a magnetic levitation magnet 16 which is magnetically levitated apart from the high temperature superconductor 14, and the magnetic levitation magnet 16 rotates integrally. The rotary shaft 17, a driven magnet 18 which rotates integrally with the rotary shaft 17, a drive magnet 19 which is separated from the driven magnet 18 and is rotated by a magnetic force, and a magnetic levitation magnet 16 which is fixedly installed in the container 21. Stirring blade 22 for stirring the liquid of
And consists of.

Although the GM refrigerator having the cold head 12 is used as the refrigerator 11, even a high temperature superconductor capable of cooling to below the superconducting transition temperature, for example, a pulse tube refrigerator or a Stirling refrigerator is used. Good.

The size of the ferromagnetic body 13 is φ30 × t15.
(Mm) soft magnetic material, permendur (Fe-50
Co-2V) was used. Other soft magnetic materials include silicon steel (Fe-3Si) and iron-aluminum (Fe-3.5).
Al), sendust (Fe-9.5Si-5.5A)
l), Metaglass 2605SC (Fe-3B-2Si-
0.5C), 2605S2 (Fe-3B-5Si) can be used, and as permanent magnets, Sm-Co, Nd-
Fe-B and Sm-Fe-N can be used.

The high temperature superconductor 14 contains 15% by weight of Ag2.
It is an Sm-Ba-Cu-O system prepared by a melting method by adding O (silver oxide) and 0.5 wt% Pt (platinum). The size is φ36 × t15 (mm).

The heat insulating container 15 is made of SUS304,
Ferromagnetic material 13, high temperature superconductor 14 and cold head 12
Is installed internally. The inside of the heat insulating container 15 is in a vacuum state in order to prevent heat from entering from the outside as much as possible.

The magnetic levitation magnet 16 is arranged above the high temperature superconductor 14 outside the heat insulating container 15 and inside the container 22 so that the distance to the high temperature superconductor 14 is constant. The material is Nd-Fe-B, and the size is φ40 × t15 (mm).

FIG. 2 shows the state of magnetic force lines of the non-contact rotating device of the first embodiment. The high temperature superconductor 14 has a pinning point 20 which is a non-superconducting phase inside. The ferromagnetic body 13 is arranged so as to face the magnetic levitation magnet 16 and sandwich the high-temperature superconductor 14. It should be noted that the configuration is upside down from the magnetic levitation state of the conventional non-contact rotating device of FIG.

The mechanism by which the high-temperature superconductor 14 captures a magnetic field will be described. When a magnetic field is applied to the high-temperature superconductor 14 from the outside by a magnetizing device (not shown), the high-temperature superconductor 14 is cooled to a temperature below the superconducting transition temperature and magnetized. Magnetic field becomes a unit of one magnetic force line (quantized magnetic flux) and penetrates into the high temperature superconductor 14 in the form of many magnetic force lines. The lines of magnetic force are captured by the pinning points 20 dispersed inside the high-temperature superconductor 14, and even if the external magnetic field disappears, the magnetic field is high-temperature superconductor 1.
4 It is stored and remains inside. The force (pinning force) by which the pinning points 20 of the high-temperature superconductor 14 capture the magnetic lines of force is a characteristic peculiar to the material of the high-temperature superconductor 14, and generally becomes stronger as the temperature becomes lower. Therefore, if the superconductor is cooled to a low temperature, the pinning force is improved and the magnetic field that can be captured by the high temperature superconductor 14 is increased. In the present invention, the high temperature superconductor 1
4, the ferromagnetic body 13 is arranged below the magnetic levitation magnet 16 (a position where the ferromagnetic body 13 faces the magnetic levitation magnet 16 and sandwiches the high temperature superconductor 14). Therefore, most of the magnetic field lines from the magnetic levitation magnet 16 are high temperature superconducting materials. It is captured and stored in the pinning point 20 inside the body 14.

In the present invention, although the high-temperature superconductor 14 is positioned so as to face the magnetic levitation magnet 16 and sandwich the high-temperature superconductor 14 even after the high-temperature superconductor 14 is magnetized.
It is also possible to remove the ferromagnetic material 13 after the magnetization.
Even in this case, most of the magnetic force lines from the magnetic levitation magnet 16 are captured and stored in the pinning points 20 inside the high temperature superconductor 14.

In the first embodiment of the present invention, the ferromagnetic body 13 for guiding the magnetic force lines from the magnetic levitation magnet 16 to the pinning points 20 of the high temperature superconductor 14 when the high temperature superconductor 14 is magnetized.
Is arranged at a position sandwiching the high-temperature superconductor 14 so as to face the magnetic levitation magnet 16, most of the magnetic lines of force from the magnetic levitation magnet 16 are captured and stored in the pinning points 20 of the high-temperature superconductor 14. When most of the lines of magnetic force are captured and stored in the pinning points 20 of the high temperature superconductor 14, the magnetic levitation magnet 1
6 and the pinning force of the high temperature superconductor 14 are improved, and stable magnetic levitation is possible even when a large rotational torque acts between the high temperature superconductor 14 and the magnetic levitation magnet 16.

Further, by using the refrigerator 11 having the cold head 12 as the refrigerating means, it becomes possible to obtain a continuous pinning force.

Further, by providing the ferromagnetic body 13, the high temperature superconductor 14 and the cold head 12 in the heat insulating container 15,
It becomes possible to efficiently cool the high-temperature superconductor 14 to the superconducting transition temperature or lower. When the inside of the heat insulating container 15 is evacuated, heat can be prevented from entering due to heat transfer from the outside to the high temperature superconductor 14, and the heat insulating container 15 prevents the high temperature superconductor 1
It is possible to prevent heat from entering the 4 due to radiation. When heat can be prevented from entering the high-temperature superconductor 14, the operating load of the refrigerator 11 can be reduced.

In the first embodiment of the present invention, in the conventional non-contact rotating device, when the container 21 was filled with 1 liter or more of water, it was difficult to stably stir by the stirring blades 22. In the invention, even if 20 liters or more of water is filled, stable floating stirring can be achieved.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention, and the description of the portions common to the first embodiment will be omitted. The main difference from the first embodiment is that the electromagnet 23 is used as the magnetic field assisting member in the second embodiment and that the heat insulating container is not used. The electromagnet 23 is composed of a coil 24 and a soft magnetic body 25. Other configurations are the same as those in the first embodiment.

In the second embodiment of the present invention, as in the first embodiment, the magnetic levitation magnet 16 is used when the high temperature superconductor 14 is magnetized.
The magnetic field from the magnetic levitation magnet 16 is arranged by arranging the electromagnet 23 for guiding the magnetic field line from the magnetic levitation magnet 16 to the pinning point 20 of the high temperature superconductor 14 at a position facing the magnetic levitation magnet 16 and sandwiching the high temperature superconductor 14. Many are captured and stored at pinning points 20 on the high temperature superconductor 14. When most of the lines of magnetic force are captured and stored in the pinning points 20 of the high-temperature superconductor 14, the pinning force between the magnetic levitation magnet 16 and the high-temperature superconductor 14 is improved, and the magnetic levitation magnet 16 and the magnetic levitation magnet 16 are separated from each other. Stable magnetic levitation is possible even when a large rotational torque is applied.

[0035]

According to the present invention, even when a large rotating torque is applied between the high-temperature superconductor and the magnetic levitation magnet, a sufficient pinning force, which is a property of capturing a magnetic field, is obtained, and stable magnetic levitation is possible. It is possible to provide a non-contact rotating device.

[Brief description of drawings]

FIG. 1 is a non-contact rotating device according to a first embodiment of the present invention.

FIG. 2 shows a state of magnetic force lines of the non-contact rotating device of the first embodiment.

FIG. 3 is a non-contact rotating device according to a second embodiment of the present invention.

FIG. 4 is a conventional non-contact rotating device.

FIG. 5 shows a state of magnetic force lines of a conventional non-contact rotating device.

[Explanation of symbols]

11 Refrigerator (freezing means) 13 Ferromagnetic material (magnetic field auxiliary member) 14 High temperature superconductor 16 Magnetic levitation magnet 18 Driven magnet 19 Drive magnet 20 pinning points

Claims (7)

[Claims] 1. A cooling means, a high-temperature superconductor that is provided with a pinning point and is cooled by the cooling means, a magnetic levitation magnet that is magnetically levitated apart from the high-temperature superconductor, and the magnetic levitation magnet rotates integrally with the magnetic levitation magnet. In a non-contact rotating device including a driven magnet for rotating the driven magnet and a drive magnet that is separated from the driven magnet to rotate by a magnetic force, the magnetic flux from the magnetic levitation magnet is applied to the high temperature superconductor when the high temperature superconductor is magnetized. A non-contact type magnetic head, comprising: a magnetic field assisting member for guiding the pinning point of the superconductor, wherein the magnetic field assisting member is disposed at a position facing the magnetic levitation magnet and sandwiching the high temperature superconductor. Rotating device. 2. The non-contact rotating device according to claim 1, wherein the magnetic field assisting member is a ferromagnetic material or an electromagnet. 3. The non-contact rotating device according to claim 2, wherein the ferromagnetic material is a permanent magnet or a soft magnetic material. 4. The non-contact rotation according to claim 1, wherein the cooling means is a refrigerator, and the refrigerator includes a cold head for cooling the high temperature superconductor. apparatus. 5. The non-contact rotating device according to claim 4, wherein the magnetic field assisting member, the high-temperature superconductor, and the cold head are provided inside a heat insulating container. 6. The high-temperature superconductor is manufactured by a melting method, the main component of which is RE-Ba-Cu-O, and RE is Y,
La, Nd, Sm, Eu, Gd, Er, YbDy, Ho
6. The non-contact rotating device according to claim 1, wherein the non-contact rotating device is at least one kind or a combination of two or more kinds. 7. The high temperature superconductor comprises Ag as an additive,
Contain at least one kind of Au, Pt, and Ce,
The non-contact rotating device according to claim 6.