CN111261360B - High-temperature superconducting coil shielding current eliminating device - Google Patents

High-temperature superconducting coil shielding current eliminating device Download PDF

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Publication number
CN111261360B
CN111261360B CN202010059535.1A CN202010059535A CN111261360B CN 111261360 B CN111261360 B CN 111261360B CN 202010059535 A CN202010059535 A CN 202010059535A CN 111261360 B CN111261360 B CN 111261360B
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temperature superconducting
binding post
strip
stainless steel
wound
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CN111261360A (en
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王磊
王秋良
刘建华
秦朗
王康帅
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H01F6/065—Feed-through bushings, terminals and joints
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F2006/001—Constructive details of inductive current limiters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

A high-temperature superconducting coil shielding current eliminating device comprises a framework, a cold head, a high-temperature superconducting strip, a stainless steel strip, a binding post, an alternating current power supply and a direct current power supply. The surfaces of the high-temperature superconducting strip and the stainless steel strip are not wrapped by insulating materials and are wound on the framework in parallel. The inner side of the framework is provided with a groove for mounting the binding post, and the outer side of the framework is provided with a round hole for mounting the binding post and the cold head respectively. The inner sides of the high-temperature superconducting strip and the stainless steel strip share the binding post, the outer sides of the high-temperature superconducting strip and the stainless steel strip are respectively connected with the independent binding post, the high-temperature superconducting strip is connected with the direct-current power supply to generate a static magnetic field in the central area of the coil, the stainless steel strip is connected with the alternating-current power supply to provide current flowing between the high-temperature superconducting strip and the stainless steel strip to cause interlayer resistance heating, so that critical current in the high-temperature superconducting coil is reduced, and the influence of shielding current is further eliminated.

Description

High-temperature superconducting coil shielding current eliminating device
Technical Field
The invention relates to a shielding current eliminating device, in particular to a shielding current eliminating device for a high-temperature superconducting coil.
Background
In recent years, superconducting magnets are widely used in various fields such as national economy and scientific research. Compared with the traditional low-temperature superconducting wire, the high-temperature superconducting tape, such as commercial Bi-2223 and REBCO tape, has higher critical temperature, critical magnetic field and mechanical strength, and is paid high attention by researchers from birth, and the working characteristics of the high-temperature superconducting tape are continuously improved. Due to the excellent current-carrying performance and the higher operation temperature range, the high-temperature superconducting magnet has the irreplaceable function of a low-temperature superconducting magnet in various fields, such as the fields of space high-intensity magnetic field application, a high-field superconducting magnetic resonance spectrometer, conduction cooling magnetic resonance imaging equipment, superconducting power transmission, superconducting radio frequency application and the like.
Meanwhile, the electromagnetic property of the high-temperature superconducting tape has strong anisotropy, the section of the high-temperature superconducting tape is of a unique rectangular structure, and shielding current can be induced in the high-temperature superconducting tape when the high-temperature superconducting tape is subjected to the action of a vertical magnetic field. The generation of the shielding current causes the uneven distribution of the conduction current in the high-temperature superconducting strip, which seriously affects the distribution of the magnetic field in the uniform area of the high-temperature superconducting magnet and deteriorates the uniformity of the magnetic field. Due to the influence of the magnetic flux peristaltic action, the shielding current slowly changes along with the time, so that the magnetic field drifts, the stability of the magnetic field of the high-temperature superconducting magnet is directly influenced, and the application of the high-temperature superconducting magnet in high-precision NMR and MRI equipment is challenged.
Disclosure of Invention
The invention aims to effectively eliminate the influence of shielding current in a high-temperature superconducting coil, and provides a high-temperature superconducting coil shielding current eliminating device to ensure the application of a high-temperature superconducting magnet in the field of magnets such as ultra-high field NMR (nuclear magnetic resonance) or MRI (magnetic resonance imaging).
The structure of the invention is as follows:
the high-temperature superconducting coil shielding current eliminating device is composed of a framework, a high-temperature superconducting strip, a stainless steel strip, a first binding post, a second binding post, a third binding post, a cold head, an alternating current power supply and a direct current power supply.
The framework is positioned at the bottommost part of the whole device, the surfaces of the high-temperature superconducting strip and the stainless steel strip are not wrapped by insulating materials and are wound on the framework in parallel, the stainless steel strip is positioned on the outer side, and the high-temperature superconducting strip is positioned on the inner side. The inner side of the framework is provided with a groove, and a third binding post is arranged in the groove. And the outer side of the framework is provided with a round hole which is respectively provided with a first binding post, a second binding post and a cold head. The inner sides of the high-temperature superconducting strips and the stainless steel strips share a third binding post, the outer sides of the high-temperature superconducting strips are connected with the first binding post, the outer sides of the stainless steel strips are connected with the second binding post, coils wound by the high-temperature superconducting strips are powered by a direct-current power supply, and coils wound by the stainless steel strips are powered by an alternating-current power supply.
The framework, the first binding post, the second binding post and the third binding post are processed by red copper materials, and polyimide films are adopted for insulation between the framework and the first binding post, between the framework and the second binding post and between the framework and the third binding post.
The coil inductance wound by the high-temperature superconducting strip is L1, the first hoop resistance is R1, the coil inductance wound by the stainless steel strip is L2, the second hoop resistance is R2, the high-temperature superconducting strip is in direct contact with metal on the surface of the stainless steel strip, and the radial contact resistance is R3; the coil inductor L1 wound by the high-temperature superconducting strip is connected with the first circumferential resistor R1 in series, the coil inductor L2 wound by the stainless steel strip is connected with the second circumferential resistor R2 in series, and the direct-current power supply, the alternating-current power supply, the coil inductor L1 wound by the high-temperature superconducting strip, the first circumferential resistor R1, the coil inductor L2 wound by the stainless steel strip, the second circumferential resistor R2 and the radial contact resistor R3 form a parallel circuit.
The working process of the high-temperature superconducting coil shielding current eliminating device is as follows: firstly, a framework, a high-temperature superconducting strip, a stainless steel strip, a first binding post, a second binding post and a third binding post are placed in a vacuum heat insulation device, the framework, the high-temperature superconducting strip, the stainless steel strip, the first binding post, the second binding post and the third binding post are cooled to be below 95K through a cold head, the circumferential resistance R1 of the high-temperature superconducting strip is reduced to 0, a direct-current power supply supplies power to an integral circuit, the current is I1, and a stable magnetic field in a central area is generated. And then an alternating current power supply is switched on to generate an alternating current I2, and due to the limitation of a coil inductor L1 wound by the high-temperature superconducting strip and a coil inductor L2 wound by the stainless steel strip, the alternating current I2 passes through a radial contact resistor R3 completely, the heating power is P, the temperature of the high-temperature superconducting strip is increased in a short time, the critical current of the high-temperature superconducting strip is reduced, the flowing space of a shielding current is reduced, and the influence of the shielding current on a uniform magnetic field is further eliminated.
Drawings
FIG. 1 is a three-dimensional view of a high temperature superconducting coil shield current eliminating apparatus of the present invention;
FIG. 2 is a circuit diagram of a high temperature superconducting coil shielding current eliminating apparatus according to the present invention;
FIG. 3 is a three-dimensional view of a bobbin in the high-temperature superconducting coil current-shielding elimination apparatus of the present invention;
FIG. 4 is a three-dimensional view of a first terminal of the high-temperature superconducting coil current elimination device according to the present invention;
FIG. 5 is a three-dimensional view of a third terminal of the high-temperature superconducting coil current-shielding elimination apparatus according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1 to 5, the embodiment of the present invention is composed of a former 1, a high temperature superconducting tape 3, a stainless steel tape 5, a first terminal 2, a second terminal 4, a third terminal 6, a cold head 7, an ac power supply 8 and a dc power supply 9.
The framework 1 is positioned at the bottommost part of the whole device, the surfaces of the high-temperature superconducting strip 3 and the stainless steel strip 5 are not wrapped by insulating materials and are wound on the framework 1 in parallel, the stainless steel strip is positioned at the outer side, and the high-temperature superconducting strip is positioned at the inner side. The inner side of the framework 1 is provided with a groove for mounting a third binding post 6. The outer side of the framework 1 is provided with a round hole, and the first binding post 2, the second binding post 4 and the cold head 7 are respectively arranged.
The inner sides of the high-temperature superconducting strips 3 and the stainless steel strips 5 share a third binding post 6, the outer sides of the high-temperature superconducting strips 3 are connected with the first binding post 2, the outer sides of the stainless steel strips 5 are connected with the second binding post 4, coils wound by the high-temperature superconducting strips 3 are supplied with power by a direct-current power supply 9, and coils wound by the stainless steel strips 5 are supplied with power by an alternating-current power supply 8.
Skeleton 1, first terminal 2, second terminal 4 and third terminal 6 by red copper material processing, between skeleton 1 and first terminal 2, between skeleton 1 and the second terminal 4, adopt the polyimide film to insulate between skeleton 1 and the third terminal 6.
The coil inductance wound by the high-temperature superconducting strip 3 is L1, the first hoop resistance is R1, the coil inductance wound by the stainless steel strip 5 is L2, the second hoop resistance is R2, the high-temperature superconducting strip 3 is in direct contact with the surface metal of the stainless steel strip 5, and the radial contact resistance is R3; the coil inductor L1 wound by the high-temperature superconducting strip is connected with the first circumferential resistor R1 in series, the coil inductor L2 wound by the stainless steel strip 5 is connected with the second circumferential resistor R2 in series, and the direct-current power supply 9, the alternating-current power supply 8, the coil inductor L1 wound by the high-temperature superconducting strip, the first circumferential resistor R1, the coil inductor L2 wound by the stainless steel strip, the second circumferential resistor R2 and the radial contact resistor R3 form a parallel circuit.
The working principle and the working process of the high-temperature superconducting coil shielding current eliminating device are that the framework 1, the high-temperature superconducting strip 3, the stainless steel strip 5, the first binding post 2, the second binding post 4 and the third binding post 6 are placed in a vacuum heat insulation device, the framework 1, the high-temperature superconducting strip 3, the stainless steel strip 5, the first binding post 2, the second binding post 4 and the third binding post 6 are cooled to be below 95K by the cold head 7, and the annular resistance R1 of the high-temperature superconducting strip 3 is reduced to be 0. The whole circuit is powered by a direct current power supply 9, the current is I1, and a stable magnetic field in the central area is generated. Then, an alternating current source 8 is turned on to generate an alternating current I2, and due to the limitation of a coil inductance L1 wound by the high-temperature superconducting strip 3 and a coil inductance L2 wound by the stainless steel strip, the alternating current I2 passes through a radial contact resistor R3, the heating power is P, the temperature of the high-temperature superconducting strip 3 is raised in a short time, the critical current of the high-temperature superconducting strip 3 is reduced, the flowing space of the shielding current is reduced, and the influence of the shielding current on the uniform magnetic field is further eliminated.

Claims (2)

1. A high-temperature superconducting coil shielding current eliminating device is characterized in that: the high-temperature superconducting coil shielding current eliminating device consists of a framework (1), a high-temperature superconducting strip (3), a stainless steel strip (5), a first binding post (2), a second binding post (4), a third binding post (6), a cold head (7), an alternating current power supply (8) and a direct current power supply (9); the framework (1) is positioned at the bottommost part of the high-temperature superconducting coil shielding current eliminating device, the surfaces of the high-temperature superconducting strip (3) and the stainless steel strip (5) are not wrapped by insulating materials and are wound on the framework (1) in parallel, the stainless steel strip (5) is positioned at the outer side, and the high-temperature superconducting strip (3) is positioned at the inner side; a groove is formed in the inner side of the framework (1), a third binding post (6) is installed, a round hole is formed in the outer side of the framework (1), and a first binding post (2), a second binding post (4) and a cold head (7) are installed respectively; the inner sides of the high-temperature superconducting strips (3) and the stainless steel strips (5) share a third binding post (6), the outer side of the high-temperature superconducting strips (3) is connected with a first binding post (2), the outer side of the stainless steel strips (5) is connected with a second binding post (4), coils wound by the high-temperature superconducting strips (3) are powered by a direct current power supply (9), and coils wound by the stainless steel strips (5) are powered by an alternating current power supply (8);
the coil inductance wound by the high-temperature superconducting tape (3) is L1, the first hoop resistance is R1, the coil inductance wound by the stainless steel tape (5) is L2, the second hoop resistance is R2, the high-temperature superconducting tape (3) is in direct contact with metal on the surface of the stainless steel tape (5), and the radial contact resistance is R3; a coil inductor L1 wound by the high-temperature superconducting strip is connected with a first circumferential resistor R1 in series, a coil inductor L2 wound by the stainless steel strip (5) is connected with a second circumferential resistor R2 in series, and a direct-current power supply (9), an alternating-current power supply (8), a coil inductor L1 wound by the high-temperature superconducting strip (3), a first circumferential resistor R1, a coil inductor L2 wound by the stainless steel strip (5), a second circumferential resistor R2 and a radial contact resistor R3 form a parallel circuit;
placing a framework (1), a high-temperature superconducting strip (3), a stainless steel strip (5), a first binding post (2), a second binding post (4) and a third binding post (6) in a vacuum heat insulation device, cooling the framework (1), the high-temperature superconducting strip (3), the stainless steel strip (5), the first binding post (2), the second binding post (4) and the third binding post (6) to be below 95K by a cold head (7), reducing the circumferential resistance R1 of the high-temperature superconducting strip (3) to 0, supplying power to an integral circuit by a direct current power supply (9), wherein the current is I1, and generating a stable magnetic field in a central region; and then an alternating current source (8) is switched on to generate an alternating current I2, and due to the limitation of a coil inductance L1 wound by the high-temperature superconducting strip (3) and a coil inductance L2 wound by the stainless steel strip (5), the alternating current I2 passes through a radial contact resistor R3 completely, the heating power is P, the temperature of the high-temperature superconducting strip (3) is increased, the critical current of the high-temperature superconducting strip (3) is reduced, the flowing space of the shielding current is reduced, and the influence of the shielding current on a uniform magnetic field is further eliminated.
2. The apparatus for eliminating shielding current of high temperature superconducting coil of claim 1, wherein: skeleton (1), first terminal (2), second terminal (4) and third terminal (6) are processed by red copper material, between skeleton (1) and first terminal (2), between skeleton (1) and second terminal (4), adopt the polyimide film to insulate between skeleton (1) and third terminal (6).
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US4971947A (en) * 1988-06-20 1990-11-20 University Of Colorado Foundation, Inc. Superconductor magnetic reading and writing heads

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US4971947A (en) * 1988-06-20 1990-11-20 University Of Colorado Foundation, Inc. Superconductor magnetic reading and writing heads

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