CN114743750A - Magnetic flux pump system control method and controllable magnetic flux pump system - Google Patents
Magnetic flux pump system control method and controllable magnetic flux pump system Download PDFInfo
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- CN114743750A CN114743750A CN202210342822.2A CN202210342822A CN114743750A CN 114743750 A CN114743750 A CN 114743750A CN 202210342822 A CN202210342822 A CN 202210342822A CN 114743750 A CN114743750 A CN 114743750A
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- 230000004907 flux Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000004323 axial length Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
- H01F6/006—Supplying energising or de-energising current; Flux pumps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/006—Supplying energising or de-energising current; Flux pumps
- H01F6/008—Electric circuit arrangements for energising superconductive electromagnets
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Superconductive Dynamoelectric Machines (AREA)
Abstract
The invention relates to the technical field of superconducting magnets, and provides a control method of a magnetic flux pump system and a controllable magnetic flux pump system, wherein the method is to apply a background magnetic field with continuously adjustable direction and intensity to a superconducting stator; the system applies the method, which comprises a rotary flux pump, a superconducting stator, a superconducting coil and a variable magnetic field generating device; the superconducting stator is connected with the superconducting coil to form a closed loop; the superconducting stator is positioned between the rotary flux pump and the variable magnetic field generating device; the variable background magnetic field generated by the variable magnetic field device exerts influence on the alternating current traveling wave generated by the rotating flux pump, and further the control on the size and the direction of the superconducting current is realized through the change of the intensity and the direction of the background magnetic field; the system can realize the fine control of the superconducting current without contact, changing the rotating direction of the rotary flux pump and changing the structures of the superconducting stator and the like, and has very great application prospect.
Description
Technical Field
The invention relates to the technical field of superconducting magnets, in particular to a magnetic flux pump system control method and a controllable magnetic flux pump system.
Background
The flux pump provides a unique non-contact method for the technology of superconductor excitation, and the method does not need to establish physical connection between low-temperature and normal-temperature environments through a current lead, so that the heat loss of a low-temperature system is greatly reduced, the utilization rate of energy is improved, and the flux pump is an important part in the application field of superconducting power. Because the magnetic field magnetizing device has light weight and small volume, a stronger magnetizing magnetic field can be generated, and the loss is extremely low, so the magnetic field magnetizing device has wide application prospect in various fields such as medical treatment, energy, traffic and the like by virtue of the superiority.
Research based on rotary flux pumps to regulate the magnitude and direction of superconducting currents has attracted much interest in recent years to researchers in this field of research. The adjustment of the direction of the superconducting current is mainly adjusted by changing the rotating direction of the magnetic disk of the rotary magnetic flux pump, and because the permanent magnetic disk has rotating inertia, the method for adjusting the direction of the superconducting current by changing the rotating direction of the magnetic disk of the rotary magnetic flux pump is difficult to realize high-precision control and difficult to control the current; the adjustment of the magnitude of the load current is generally achieved by adjusting the rotating speed, the magnetic flux gap, the geometry of the annular magnetic yoke and the width of the stator wire, wherein the adjustment of the magnetic flux gap, the geometry of the annular magnetic yoke and the width of the stator wire all need to change the magnitude of the load current by changing the structure of the magnetic flux pump, and there is a certain operability in practice.
Disclosure of Invention
The invention aims to provide a magnetic flux pump system control method and a controllable magnetic flux pump system, wherein the method is characterized in that the magnitude and the direction of the direct current output of a magnetic flux pump are regulated and controlled by adopting a background magnetic field, so that the magnitude and the direction of load current can be conveniently and effectively controlled without changing the structure of the magnetic flux pump.
The embodiment of the invention is realized by the following technical scheme:
in a first aspect, a method for controlling a magnetic flux pump system is provided, in which a background magnetic field with continuously adjustable direction and intensity is applied to a superconducting stator, so that the direction of a current is changed by changing the direction of the background magnetic field, and the magnitude of the surface current is changed by changing the intensity of the background magnetic field.
In a second aspect, a controllable flux pump system is provided, comprising a rotary flux pump, a superconducting stator, a superconducting coil, and a variable magnetic field generating device;
the superconducting stator is connected with the superconducting coil to form a closed loop;
the superconducting stator is located between the rotary flux pump and the variable magnetic field generating device.
Preferably, the variable magnetic field generating device comprises a dc coil and an adjustable dc power supply for supplying power to the dc coil.
Preferably, rotation type flux pump includes disk, connecting rod and motor, the pivot of motor with the connecting rod is connected and both are coaxial, the fixed cover of disk is located the connecting rod, the disk center inlays and is equipped with the fixing base, the fixing base is coaxial with the disk, the axial length of fixing base is greater than the axial length of disk, the fixing base is not equipped with fixed via hole in the part that contacts with the disk, fixed via hole runs through the fixing base.
Preferably, a plurality of grooves are uniformly formed in the peripheral surface of the magnetic disk, and permanent magnets are embedded in the grooves.
Preferably, the rotary flux pump further comprises a frequency converter for controlling the motor.
Preferably, the superconducting coil is a single-wire double-pancake superconducting coil, the single-wire double-pancake superconducting coil is provided with two wire ends, and the wire ends are used as an inlet or an outlet of current; the superconducting stator and the superconducting coil are both ReBCO strips, and two ends of the superconducting stator are respectively connected with the wire ends.
Preferably, the superconducting stator includes a first surface and a second surface opposite to the first surface, the first surface is in contact with a surface of one end of the dc coil, and the second surface has a gap with the magnetic disk.
Preferably, the first surface and the direct current coil are arranged in front of the hall element.
Preferably, both ends of the superconducting stator are provided with bending parts.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
the device has reasonable design and simple structure, and is particularly provided with a variable magnetic field generating device which can generate a constant direct current magnetic field with continuously adjustable direction and intensity, so that the size and the direction of alternating current traveling waves generated by the rotary flux pump can be controlled and adjusted through the constant direct current magnetic field, namely the size and the direction of current in the superconductor can be accurately and conveniently adjusted without contact.
Drawings
FIG. 1 is a schematic diagram of a horizontal layout of a controllable magnetic flux pump system according to the present invention;
FIG. 2 is a schematic diagram of a vertical layout of a controllable magnetic flux pump system according to the present invention;
fig. 3 is a schematic diagram of a dark turning structure of the dc coil and the stator provided by the present invention;
FIG. 4 is a front and top view of a disk-superconducting stator-DC coil configuration provided by the present invention;
FIG. 5 is a schematic structural diagram of a horizontal layout of superconducting coils-superconducting stator-DC coils provided by the present invention;
FIG. 6 is a schematic diagram of the structure of the motor-connecting rod-magnetic disk provided by the present invention;
icon: 1-superconducting stator, 2-superconducting coil, 3-direct current coil, 4-magnetic disc, 5-connecting rod, 6-motor, 7-fixing seat, 8-permanent magnet and 9-fixing through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The superconducting technology has wide application prospect, and how to realize the control and adjustment of superconducting current is a popular research direction in recent years; the control and regulation aiming at the superconducting current mainly comprises the control of the magnitude and the direction of the current; current control means include: the direction of the current is adjusted by changing the rotating direction of the rotating magnetic flux pump disk 4, but because the permanent magnetic disk 4 has rotating inertia, the method of adjusting the direction of the superconducting current by changing the rotating direction of the rotating magnetic flux pump disk 4 is difficult to realize high-precision control; the superconducting current is adjusted by adjusting the rotating speed, the magnetic flux gap, the geometric shape of the annular magnetic yoke, the width of the stator wire and the like, but the load current is changed by changing the structure by adjusting the magnetic flux gap, the geometric shape of the annular magnetic yoke and the width of the stator wire, so that certain operability exists in practical application.
Therefore, how to realize the control of the direction and the size of the superconducting current on the premise of not changing the structure has important significance for the application and the popularization of the superconducting technology. Based on this, the present invention provides a concept to solve the above-mentioned problems.
Firstly, the invention provides a control method of a magnetic flux pump system, in the method, a constant background magnetic field with continuously adjustable direction and intensity is required to be applied to a superconducting stator 1, a direct current magnetic field is generally selected as the background magnetic field, and then the magnitude and the direction of alternating current traveling waves generated by the rotating magnetic flux pump are influenced by the constant direct current magnetic field. Correspondingly, the direction of the alternating current wave is changed by changing the magnetic field direction of the constant direct current magnetic field, so that the direction of the pumping current is changed; the intensity of the constant direct current magnetic field is changed to change the size of the alternating current traveling wave, and further the size of the pumping current is changed. By the method, the change of the pumping current can be realized without contact and without changing the structure of the magnetic flux pump system, and the superconducting system can be applied to more scenes.
According to the method, the invention also provides a corresponding device for controlling the superconducting current, which is characterized in that a variable background magnetic field generated by a variable magnetic field device exerts influence on the alternating traveling wave generated by the gyromagnetic flux pump, and the control on the magnitude and direction of the superconducting current is realized through the change of the intensity and direction of the background magnetic field.
In this embodiment, the superconducting stator 1 is connected to the superconducting coil 2 to form a closed loop; in this embodiment, the superconducting coil 2 is a single-wire double-pancake superconducting coil, and this embodiment only shows a case where there is one single-wire double-pancake superconducting coil, and related parameters and the number of the single-wire double-pancake superconducting coils can be adjusted according to an actual situation, and thus, description thereof is omitted.
At present, the materials of the superconducting stator 1 and the superconducting coil 2 are selected more, the application preferably adopts a ReBCO tape, the superconducting coil 2 obtained by winding the ReBCO tape is provided with two tape thread ends, one tape thread end is used as an inlet of current, the other tape thread end is used as an outlet of the current, two ends of the superconducting stator 1 are respectively connected with the tape thread ends, so that the superconducting stator 1 and the superconducting coil 2 form a closed loop, when a magnetic flux pump generates a travelling wave magnetic field on the surface of the superconducting stator 1, the travelling wave magnetic field can be coupled with magnetic flux quanta in the superconducting stator 1, and when the travelling wave magnetic field moves along one direction, direct current voltage can be generated at two ends of the superconducting stator 1, and further direct current is generated in the closed loop.
The superconducting stator 1 is positioned between the rotary flux pump and the variable magnetic field generating device; the variable magnetic field generating device comprises a direct current coil 3 and an adjustable direct current power supply for supplying power to the direct current coil 3; the superconducting stator 1 is made of ReBCO strips, so that the superconducting stator 1 is in a strip shape, in the embodiment, the width of the superconducting stator is 12mm, and the thickness of the superconducting stator is 220 um; neglecting the thickness, using one of the two surfaces of the superconducting stator 1 as the first surface, and the other surface as the second surface; as shown in fig. 3, the first surface is in contact with a surface of one end of the dc coil 3; it should be noted that the outer shape of the dc coil 3 is generally a cylinder, but as shown in the present embodiment, it is needless to say that the outer shape of the dc coil 3 may be effective even in a racetrack shape under the idea of the present invention. There is a gap of about 1mm between the second surface and the disk 4, although in practice the size of this gap can be adjusted according to the actual situation.
As shown in fig. 4 and 5, the optimal arrangement positions of the magnetic disk 4, the superconducting stator 1 and the dc coil 3 are shown, the superconducting stator 1 passes through the center of the dc coil 3, and both ends of the superconducting stator 1 are symmetrical with respect to the magnetic disk 4.
Because the superconducting coil 2 and the superconducting stator 1 in this embodiment are horizontally arranged, in this embodiment, both ends of the superconducting stator 1 have bent portions, so that the superconducting coil 2 is parallel to the surface of the superconducting stator 1, as shown in fig. 1, this way enables the controllable magnetic flux pump system to be divided into three layers, namely a magnetic flux pump, a superconducting coil 2-the superconducting stator 1, and a dc coil 3.
Next, as shown in fig. 1, 2, and 6, the rotary flux pump in this embodiment includes a magnetic disk 4, a connecting rod 5, and a motor 6, a rotating shaft of the motor 6 is connected to the connecting rod 5 and is coaxial with the connecting rod 5, the magnetic disk 4 is fixedly sleeved on the connecting rod 5, a fixing seat 7 is embedded in the center of the magnetic disk 4, the fixing seat 7 is coaxial with the magnetic disk 4, the axial length of the fixing seat 7 is greater than the axial length of the magnetic disk 4, a fixing through hole 9 is provided in a portion of the fixing seat 7 not in contact with the magnetic disk 4, and the fixing through hole 9 penetrates through the fixing seat 7.
In addition, a plurality of grooves are uniformly formed in the peripheral surface of the magnetic disk 4, preferably, 8 grooves are formed in the peripheral surface of the magnetic disk 4, permanent magnets 8 are embedded in each groove, and then the magnetic disk 4 can continuously generate a traveling wave magnetic field when rotating.
Since it is necessary to control the speed at which the magnetic disk 4 rotates, the rotary flux pump in this embodiment further includes a frequency converter for controlling the motor 6; if the motor 6 is a three-phase motor 6, the frequency converter is a three-phase frequency converter.
In embodiment 1, since the closed loop formed by the superconducting stator 1 and the superconducting coil 2 needs to be kept in a low temperature state to realize a superconducting state, the closed loop formed by the superconducting stator 1 and the superconducting coil 2 needs to be placed in a low temperature environment, which includes realizing the low temperature environment by adopting liquid nitrogen soaking, refrigerating by a refrigerator, liquid helium or helium cooling, and the like. For example, when the horizontal layout is adopted, the superconducting coil 2, the dc coil 3 and the superconducting stator 1 are all immersed in a liquid nitrogen environment of 77K during operation, and the rotary magnetic flux pump composed of the motor 6, the connecting rod 5 and the magnetic disk 4 is placed in the air.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for controlling a magnetic flux pump system is characterized in that a background magnetic field with continuously adjustable direction and intensity is applied to a superconducting stator (1).
2. A controllable magnetic flux pump system, characterized in that, the control method of the magnetic flux pump system according to claim 1 is applied, comprising a rotary magnetic flux pump, a superconducting stator (1), a superconducting coil (2) and a variable magnetic field generating device;
the superconducting stator (1) is connected with the superconducting coil (2) to form a closed loop;
the superconducting stator (1) is located between the rotary flux pump and the variable magnetic field generating device.
3. A controllable magnetic flux pump system according to claim 2, characterized in that the variable magnetic field generating means comprise a dc coil (3) and an adjustable dc power supply for powering the dc coil (3).
4. The controllable magnetic flux pump system according to claim 2, wherein the rotary magnetic flux pump comprises a magnetic disk (4), a connecting rod (5) and a motor (6), a rotating shaft of the motor (6) is connected with the connecting rod (5) and is coaxial with the connecting rod, the magnetic disk (4) is fixedly sleeved on the connecting rod (5), a fixing seat (7) is embedded in the center of the magnetic disk (4), the fixing seat (7) is coaxial with the magnetic disk (4), the axial length of the fixing seat (7) is greater than that of the magnetic disk (4), a fixing through hole (9) is formed in a part of the fixing seat (7) which is not in contact with the magnetic disk (4), and the fixing through hole (9) penetrates through the fixing seat (7).
5. The controllable magnetic flux pump system according to claim 4, wherein the magnetic disk (4) has a plurality of grooves uniformly formed on its outer circumferential surface, and the permanent magnets (8) are embedded in the grooves.
6. A controllable magnetic flux pump system according to claim 4 or 5, characterized in that the rotary magnetic flux pump further comprises a frequency converter for controlling the electric motor (6).
7. Controllable magnetic flux pump system according to claim 2, characterized in that the superconducting coil (2) is a single-wire double-pancake superconducting coil (2), the single-wire double-pancake superconducting coil (2) having two wire ends, the wire ends being an inlet or an outlet for electrical current; the superconducting stator (1) and the superconducting coil (2) are both ReBCO strips, and two ends of the superconducting stator (1) are respectively connected with the wire ends.
8. A controllable magnetic flux pump system according to claim 3, characterized in that the superconducting stator (1) comprises a first surface in contact with a surface of one end of the dc coil (3) and a second surface opposite to the first surface with a gap to the disk (4).
9. The controllable magnetic flux pump system according to claim 8, characterized in that the first surface and the dc coil (3) are arranged in front of a hall element.
10. Controllable magnetic flux pump system according to claim 2, characterized in that both ends of the superconducting stator (1) have a bend.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210342822.2A CN114743750B (en) | 2022-04-02 | 2022-04-02 | Magnetic flux pump system control method and controllable magnetic flux pump system |
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| CN202210342822.2A CN114743750B (en) | 2022-04-02 | 2022-04-02 | Magnetic flux pump system control method and controllable magnetic flux pump system |
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| CN114743750A true CN114743750A (en) | 2022-07-12 |
| CN114743750B CN114743750B (en) | 2023-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115662722A (en) * | 2022-10-11 | 2023-01-31 | 四川大学 | Dewar isolation wall excitation structure and method and magnetic conduction intermediate piece |
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| CN115662722B (en) * | 2022-10-11 | 2023-09-08 | 四川大学 | Magnetic isolation Du Wabi excitation structure, method and magnetic conduction intermediate piece |
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