WO2024051620A1

WO2024051620A1 - Split-type alternating current winding, magnetic flux pump, and superconducting magnetic flux pump system

Info

Publication number: WO2024051620A1
Application number: PCT/CN2023/116648
Authority: WO
Inventors: 王为; 熊晨凌; 吴成怀; 龙润; 杨超
Original assignee: 四川大学
Priority date: 2022-09-08
Filing date: 2023-09-04
Publication date: 2024-03-14
Also published as: CN116111763A

Abstract

The present invention belongs to the technical field of superconducting magnet excitation systems and relates to a split-type alternating current winding, a magnetic flux pump, and a superconducting magnetic flux pump system. The split-type alternating current winding comprises an alternating current winding main body and magnetically conductive teeth; the alternating current winding main body comprises main body teeth; one end of each magnetically conductive tooth is connected to a main body tooth, and the other ends of the magnetically conductive teeth come together in the direction of extension of the main body teeth. The magnetic flux pump comprises the split-type alternating current winding, a direct current winding, and a magnetic yoke; and an air gap is formed between the magnetic yoke and the magnetically conductive teeth of the split type alternating current winding. In the present invention, a split-type alternating current winding is utilized, the problem of tooth expansion and deformation of the alternating current winding is solved, and the difficulty of coil winding is reduced; by adjusting the width of the main body teeth, the ampere-turns of the alternating current winding is improved, and the output performance of the magnetic flux pump is improved; the magnetically conductive teeth are used to guide and concentrate an alternating magnetic field, an output waveform of the magnetic flux pump is adjusted, and the output performance of the magnetic flux pump system is improved.

Description

A split AC winding, flux pump and superconducting flux pump system

Technical field

The invention belongs to the technical field of superconducting magnet excitation systems. Specifically, it relates to a split AC winding, magnetic flux pump and superconducting magnetic flux pump system.

Background technique

Superconducting magnets are an extremely important part of the field of superconducting power applications. Compared with traditional permanent magnets and ordinary electromagnets, they are light in weight and small in size, can generate stronger magnetic fields, and have extremely low losses. With their superiority, Superconducting magnets are used in many fields such as medical, energy and transportation. Currently, high-temperature superconducting magnets cannot operate in continuous current mode, limiting their further industrial applications. The magnetic flux pump can realize the quasi-continuous current mode operation of high-temperature superconducting magnets through contactless power supply, and at the same time isolate the thermal connection between low-temperature and non-low-temperature environments, thereby effectively promoting the application of high-temperature superconducting magnets.

In the past, during the winding process of the AC winding in the integrated flux pump design, due to the thin iron teeth of the AC winding and insufficient stiffness, it is very easy for the teeth to expand and deform. That is, in order to shorten the output wavelength of the flux pump, it needs to be reduced. The width of the tooth slot greatly increases the difficulty of machining and coil winding.

Since the slot width of the AC winding is small, the number of turns of each slot coil is limited, resulting in insufficient excitation current. In the solution with patent number CN113257519B, in order to increase the number of turns of the winding coil, the length of the iron teeth of the AC winding is increased. The way. However, due to the large length of the AC winding iron teeth, the side stiffness of the AC winding iron teeth is insufficient. The lateral pressure during the coil winding process will cause the iron teeth to expand outward, that is, there is a problem of tooth expansion, which makes the flux pump Performance decline affects the output performance of the flux pump.

In addition, due to the small slot width and the large side height of the AC winding iron teeth, the AC winding must be wound with thinner metal wires, which makes winding more difficult and requires a lot of time and cost. on-line.

Contents of the invention

In order to solve the above technical problems, the present invention provides a split AC winding, flux pump and superconducting flux pump system.

In a first aspect, the present invention provides a split AC winding, including:

The main body of the AC winding and a number of conductive magnet teeth;

The main body of the AC winding includes:

A plurality of body iron teeth, with tooth slots for winding coils between adjacent body iron teeth; and

AC winding;

One end of the conductive magnetic teeth is connected to the main body iron teeth, and the other end of the conductive magnetic teeth is gathered in the extending direction of the main body iron teeth.

In a second aspect, the present invention provides a magnetic flux pump based on a split AC winding, including:

Split AC winding;

DC winding; and

yoke;

The conductive magnetic teeth of the split AC winding extend toward and gather at the magnetic yoke, and there is an air gap between the conductive magnetic teeth and the magnetic yoke;

Wherein, the split AC winding, the DC winding, the magnetic yoke and the conductive magnetic teeth together constitute a magnetic circuit under the working state of the magnetic flux pump.

In a third aspect, the present invention provides a superconducting flux pump system based on split AC windings, including:

Flux pump based on split AC winding;

superconducting stator; and

superconducting load;

The superconducting stator is disposed in the air gap between the magnetic teeth and the magnetic yoke; the superconducting load is connected to the superconducting stator. Connected as a closed loop.

The beneficial effects of the present invention are: the present invention uses an AC winding with a split structure, which effectively overcomes the problem of expansion and deformation of the iron teeth of the AC winding, greatly reduces the difficulty of coil winding, and improves the efficiency of coil winding; at the same time, by increasing The width of the AC winding slot is conducive to increasing the ampere-turns of the AC winding, thereby greatly improving the current output performance of the flux pump; in addition, the magnetic conductive parts are used to guide and gather the alternating current generated by the split AC winding between the main iron teeth and the AC winding. The magnetic field is conducive to enhancing the magnetic field intensity output by the flux pump. The output waveform of the flux pump system can be adjusted by adjusting the width of the main iron teeth in the split AC winding, thereby improving the output performance of the flux pump and the flux pump system.

On the basis of the above technical solution, the present invention can also make the following improvements.

Preferably, the connection between the main body iron teeth and the conductive magnetic teeth is a mortise and tenon connection, laser welding or plug connection.

Preferably, the shape and size of the end surfaces of the conductive magnet teeth and the main body iron teeth connected and assembled are the same.

Preferably, the magnetic conductive teeth have a one-stage structure or a two-stage structure; when the magnetic conductive teeth have a one-stage structure, the cross-sectional area of one end of the magnetic conductive teeth close to the magnetic conductive teeth is the same as the size of the cross-sectional area of the magnetic conductive teeth. The cross-sectional area of the main body iron teeth is the same, and the cross-sectional area of the conductive magnetic teeth gradually decreases from the end of the conductive magnetic teeth close to the main body iron teeth; when the conductive magnetic teeth have a two-stage structure , the conductive magnet teeth include a first section of iron teeth and a second section of iron teeth; the end of the first section of iron teeth close to the main body of the iron teeth has the same cross-sectional area as the end of the main body of the iron teeth; the third section of the iron teeth has the same cross-sectional area; The cross-sectional area of the two sections of iron teeth gradually decreases from an end of the second section of conductive magnet teeth close to the first section of iron teeth.

Preferably, the DC winding is provided at one or both ends of the split AC winding;

When one end of the split AC winding is provided with the DC winding, one end of the yoke is connected to the DC winding, and the other end of the yoke extends to the split AC winding away from the DC winding. One end of the winding;

When the DC winding is provided at both ends of the split AC winding, one end of the yoke is connected to the DC winding located at one end of the split AC winding, and the other end of the yoke is connected to the DC winding located at one end of the split AC winding. The DC winding at the other end of the split AC winding forms a magnetic circuit when the flux pump is working, and the number of the magnetic yokes is consistent with the number of the magnetic circuits; the DC windings at both ends of the split AC winding The number of windings is the same.

Preferably, the superconducting load is a high-temperature superconducting coil or a superconducting closed wire.

Preferably, the superconducting load has a pair of input terminals and an output terminal; the two ends of the stator group are respectively connected to the input terminal and the output terminal to form a closed loop.

Description of the drawings

Figure 1 is a schematic structural diagram of a split AC winding in an embodiment of the present invention;

Figure 2 is a top view of Figure 1;

Figure 3 is a schematic structural diagram of an optional implementation of magnetic teeth in the embodiment of the present invention;

Figure 4 is a top view of Figure 3;

Figure 5 is a schematic structural diagram of an optional implementation of magnetic teeth in the embodiment of the present invention;

Figure 6 is a top view of Figure 5;

Figure 7 is a schematic structural diagram of a flux pump based on a split AC winding and a single-sided DC winding in an embodiment of the present invention;

Figure 8 is a top view of Figure 7;

Figure 9 is a schematic structural diagram of a flux pump based on a split AC winding and a bilateral DC winding in an embodiment of the present invention;

Figure 10 is a top view of Figure 9;

Figure 11 is a schematic structural diagram of a flux pump based on a split AC winding and a bilateral DC winding in an embodiment of the present invention;

Figure 12 is a top view of Figure 11;

Figure 13 is a schematic structural diagram of a superconducting flux pump system with a single-sided DC winding in an embodiment of the present invention;

Figure 14 is a schematic structural diagram of a superconducting flux pump system with bilateral DC windings in an embodiment of the present invention;

Figure 15 is a schematic diagram of the system structure of a double-side superconducting stator excited by a double-sided DC winding superconducting flux pump in an embodiment of the present invention;

Figure 16 is a schematic structural diagram of the installation method of the superconducting stator in the embodiment of the present invention;

Icon: 1-split AC winding; 101-main body iron teeth; 102-AC winding; 103-cogging; 104-conductive magnet teeth; 2, 201, 202, 203, 204-DC winding; 3, 301, 302- Magnetic yoke; 4, 401, 402 - superconducting stator; 5 - superconducting load; L - cuboid structure; P - conductive magnet piece; S, S1, S2 - air gap.

Detailed ways

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Example 1

As shown in Figure 1, a split AC winding includes:

The main body of the AC winding and a number of conductive magnetic teeth 104;

The main body of the AC winding includes:

A plurality of main body iron teeth 101, with tooth slots 103 for winding coils between the main body iron teeth 101; and

AC winding 102;

One end of the conductive magnetic teeth 104 is connected to the main body iron teeth 101 , and the other end of the conductive magnetic teeth 104 is gathered in the extending direction of the main body iron teeth 101 . Figure 2 is a top view of a split AC winding.

As an optional implementation, the connection method between the main body iron teeth 101 and the conductive magnet teeth 104 is a mortise and tenon connection, laser welding, or plug connection.

As an optional implementation, after one end of the conductive magnet teeth 104 is gathered in the extension direction of the main body iron teeth 101, the end of the conductive magnet teeth 104 is close to the magnetic yoke 3, and the spacing between adjacent conductive magnet teeth 104 is equal. .

As an optional embodiment, the shape and size of the joint surface of the connecting assembly of the conductive magnetic teeth and the main body iron teeth are the same. As shown in the structural schematic diagrams of the conductive magnet teeth shown in Figures 3, 4, 5 and 6, the conductive magnet teeth are extended toward the magnetic yoke, the cross-sectional size is reduced, and the spacing between the conductive magnet teeth is reduced. As shown in Figure 3 and Figure 4, as a possible In the selected embodiment, the conductive magnet teeth include two structures. The first section is a rectangular parallelepiped structure L that is jointed with the iron body teeth 101. The joint surface of the cuboid structure L and the iron body iron teeth 101 has the same size. The other section of the conductive magnet teeth is The plurality of magnetic conductive sheets P are aggregated toward the middle magnetic conductive sheet P, and one end of the plurality of magnetic conductive sheets P close to the yoke 3 is on the same plane. Figure 4 is a top view of Figure 3. As shown in Figure 5, as another optional embodiment, the magnetically conductive teeth include a segment structure, that is, they only include a plurality of magnetically conductive sheets P. The cross-section of one end of the magnetically conductive sheets P is the same as the cross-section of the main body iron teeth 101. The plurality of magnetizing pieces P of the magnet teeth are aggregated toward the middle magnetizing piece P, and the ends of the plurality of magnetizing pieces P close to the yoke are on the same plane. Figure 6 is a top view of Figure 5 .

In actual application, by increasing the width of the slot 103, the number of turns of the excitation coil in each slot 103 can be increased to ensure the excitation ampere-turns; avoiding the traditional AC winding 102 designed to ensure the excitation ampere-turns. The excessive height causes the problem of tooth expansion of the iron teeth 101, thereby enhancing the lateral stiffness of the AC winding iron teeth 101. The width of the main body iron teeth 101 and the height of the AC winding can be standardized and designed according to the size of the excitation ampere turns.

Example 2

A flux pump based on split AC winding, including:

Split AC winding;

DC winding; and

yoke;

The conductive magnet teeth of the split AC winding extend towards the magnetic yoke and gather together, and there is an air gap between the conductive magnetic teeth and the magnetic yoke;

Among them, the split AC winding, DC winding, magnetic yoke and conductive magnet teeth together form the magnetic circuit under the working state of the flux pump.

Optionally, the magnet teeth have a one-stage structure or a two-stage structure; when the magnet teeth have a one-stage structure, the cross-sectional area of the end of the magnet teeth close to the magnet teeth is the same as the cross-sectional area of the main iron teeth. , the cross-sectional area of the magnet teeth gradually decreases from the end of the magnet teeth close to the iron teeth of the main body; when the magnet teeth have a two-stage structure, the magnet teeth include the first section of iron teeth and the second section of iron teeth; The cross-sectional area of the end of the first section of iron teeth close to the main body of the iron teeth is the same as the end of the main body of the iron teeth; the cross-sectional area of the second section of iron teeth starts from the end of the second section of conductive magnet teeth close to the first section of iron teeth. decrease.

Optionally, the DC winding is provided at one or both ends of the split AC winding; when one end of the split AC winding is provided with a DC winding, one end of the yoke is connected to the DC winding, and the other end of the yoke extends to the split AC winding. The winding is away from one end of the DC winding; when there are DC windings at both ends of the split AC winding, one end of the yoke is connected to the DC winding at one end of the split AC winding, and the other end of the yoke is connected to the other end of the split AC winding The DC winding forms a magnetic circuit when the flux pump is working. The number of yokes is the same as the number of magnetic circuits; the number of DC windings at both ends of the split AC winding is the same.

As an optional implementation, as shown in Figure 7, the magnetic flux pump includes: a split AC winding 1, a DC winding 2 and a yoke 3; wherein one end of the split AC winding 1 passes through the DC winding 2 is connected to a yoke 3. Figure 8 is a top view of the main body of the magnetic flux pump. There is an air gap S between the magnetic teeth 104 and the magnetic yoke 3.

As an optional implementation, as shown in Figure 9, the magnetic flux pump includes: a split AC winding 1, two DC windings 201, 202 and a yoke 3; wherein, one end of the split AC winding 1 The DC winding 201 is connected to one end of the yoke 3 , and the other end of the split AC winding 1 is connected to the other end of the yoke 3 through the DC winding 202 . FIG. 10 is a top view of the magnetic flux pump. There is an air gap S between the magnetic teeth 104 and the magnetic yoke 3 . .

As an optional implementation, as shown in Figure 11, the magnetic flux pump includes: one split AC winding 1, four DC windings 201, 202, 203, 204 and two magnetic yokes 301, 302; wherein, One end of the split AC winding 1 is connected to one end of the DC winding 201 and one end of the DC winding 202; the other end of the split AC winding 1 is connected to one end of the DC winding 203 and one end of the DC winding 204; the other end of the DC winding 201 passes through The yoke 301 is connected to the other end of the DC winding 204; the other end of the DC winding 202 is connected to the other end of the DC winding 203 through the yoke 302. Figure 12 is a top view of the magnetic flux pump. There is an air gap S1 between the magnetic teeth and the magnetic yoke 301, and there is an air gap S2 between the magnetic teeth and the magnetic yoke 302.

In the actual application process, this split high-temperature superconducting flux pump uses a split AC winding 1, which has the advantages of Embodiment 1. The number of DC windings 2 and the number of yokes 3 are determined according to the actual application scenario. The current output size needs to be set. For example, in a scenario that requires a large current output, select a flux pump with more DC windings 2. In a scenario with a small current output, select a flux pump with less DC windings 2.

In the actual application process, by changing the number and/or size of the split AC winding 1, the DC winding 2 and the conductive magnetic teeth 104, the output waveform of the magnetic flux pump in the working state is adjusted. Specifically, the split AC winding 1 includes a main body of iron teeth 101 and an AC coil wound around the main body of iron teeth 101 . During the manufacturing process, by widening the width of each slot 103 on the split AC winding 1, it is beneficial to reduce the height of the coil winding, greatly reduce the winding difficulty of the split AC winding 1, and improve the coil winding The efficiency can avoid the problem of tooth expansion and deformation during the winding process of AC winding 102, and greatly improve the probability of successful winding. The greater the number of conductive magnet teeth, the longer the traveling wave interval of the air gap S. Therefore, the magnetic flux pump can be used in application scenarios with different current requirements. For example: in application scenarios that require large current output, the number of tooth slots needs to be increased, thus Multiple superconducting loads are connected in parallel to achieve large current output. The invention can be applied not only to the linear motor type flux pump, but also to the rotating permanent magnet type flux pump.

In order to better use this implementation, the number of the conductive magnet teeth 104 is the same as the number of the main body iron teeth 101, and the cross-sectional area of the end of the conductive magnet teeth 104 connected to the main body iron teeth 101 is larger than the cross-sectional area of the end of the conductive magnet teeth 104 close to the magnetic yoke. 3The cross-sectional area of one end. Each conductive magnet tooth 104 is connected to the corresponding main body iron tooth 101. Each conductive magnet tooth 104 is gathered at the magnetic yoke 3 to form a complete magnetic circuit in the working state and improve the current output characteristics of the flux pump.

The magnetic circuit may be made of iron, or magnetically conductive metals such as cobalt, nickel, silicon steel, etc. Of course, it may also be magnetically conductive alloys. In this embodiment, iron is used.

In the embodiment of the present invention, by arranging conductive magnetic teeth 104 on the main body of the magnetic flux pump, there is no need to increase the height of the split AC winding 102. Under the condition that the size of the magnetic flux pump is certain, the main body iron teeth 101 are connected to the conductive magnetic teeth 104. By adjusting the size of the tooth slot 103 and the size of the conductive magnet teeth, the maximum ampere-turn number of the split AC winding 1 can be adjusted. In actual application, the main part of the magnetic flux pump can be designed in a standardized manner, and magnetic teeth of different specifications can be independently designed according to the different requirements for traveling waves in different application scenarios.

Example 3

A flux pump system based on split AC windings, including:

Flux pump based on split AC winding;

superconducting stator; and

superconducting load;

The superconducting stator is arranged in the air gap between the magnetic teeth and the magnetic yoke; the superconducting load and the superconducting stator are connected in a closed loop.

In the actual application process, this is a split high-temperature superconducting flux pump system, in which the main body of the flux pump has the advantages of the split AC winding in Embodiment 1, and the flux pump has the permeable magnet teeth in Embodiment 2. advantage.

Therefore, on the basis of Embodiment 1 and Embodiment 2, the split high-temperature superconducting flux pump system is further provided with a superconducting stator and a superconducting load. The superconducting stator is arranged in the air gap, and the superconducting load and the superconducting stator are connected as a closed loop. In actual application, the flux pump of the split high-temperature superconducting flux pump system also has the optional implementation mode in Embodiment 2.

As an optional embodiment, the superconducting load is a high-temperature superconducting coil or a superconducting closed wire.

As an optional embodiment, the superconducting stator uses a high-temperature superconducting strip, specifically a ReBCO strip, which is composed of a Hastelloy layer, a ReBCO layer and a buffer layer of a substrate stacked from bottom to top. It needs to work at a temperature below 90K, where Re is a rare earth element.

As an optional implementation, in the single-sided DC coil system, the magnetic flux pump body shown in Figure 7 is used, in which the superconducting stator 4 is installed at the center of one end of the conductive magnet teeth 104 close to the magnetic yoke 3 , as shown in Figure 13, the other end of the conductive magnet teeth 104 is connected and fixed with the main body iron teeth 101; there is an air gap S between the conductive magnet teeth 104 and the magnetic yoke 3.

As an optional implementation, in a bilateral DC system, a magnetic flux pump as shown in Figure 9 is used, in which the superconducting stator 4 is installed at the center of one end of the conductive magnet teeth 104 close to the magnetic yoke 3, as shown in the appendix As shown in Figure 14, the other end of the conductive magnet teeth 104 is connected and fixed to the main body iron teeth 101; there is an air gap S between the conductive magnet teeth 104 and the magnetic yoke 3.

As an optional implementation, in the bilateral DC system, the magnetic flux pump shown in Figure 11 is used. As shown in Figure 15, a superconducting stator 401 is installed on the permeable magnet teeth 104 close to the magnetic yoke. At the center of one end of 301, the other end of the conductive magnetic teeth 104 is connected and fixed to one side of the main body iron teeth 101; there is an air gap S1 between the conductive magnetic teeth 104 and the magnetic yoke 3, and the superconducting stator 401 is arranged in the air gap S1 , the superconducting load 501 and the superconducting stator 401 are connected as a closed loop. Another superconducting stator 402 is installed at the center of one end of another conductive magnet tooth 104 close to the magnetic yoke 302. One end of the conductive magnet tooth 104 is connected and fixed with the other side of the main body iron tooth 101; the conductive magnet tooth 104 is connected to the magnetic Yoke 3 There is an air gap S2 between them, and the superconducting stator is disposed in the air gap S2. The superconducting load 502 and the superconducting stator 402 are connected as a closed loop.

Optionally, the superconducting load has a pair of input terminals and output terminals; the two ends of the superconducting stator are respectively connected to the input terminals and the output terminals to form a closed loop.

In the above optional embodiment, as shown in FIG. 16 , there is an air gap S between the magnetic teeth 104 and the magnetic yoke 3 , and the superconducting stator 4 is disposed in the air gap S. The beneficial effects of the present invention are: the present invention adopts an AC winding with a split structure, which effectively overcomes the problem of expansion and deformation of the iron teeth of the AC winding, greatly reduces the difficulty of coil winding, and improves the efficiency of coil winding; at the same time, by increasing The width of the AC winding slot is conducive to increasing the ampere-turns of the AC winding, thereby greatly improving the current output performance of the flux pump; in addition, the magnetic conductive parts are used to guide and gather the alternating current generated by the split AC winding between the main iron teeth and the AC winding. The magnetic field is conducive to enhancing the magnetic field intensity output by the flux pump. The ampere-turns of the AC winding of the flux pump system can be adjusted by adjusting the width of the main iron teeth in the split AC winding, thereby improving the output performance of the flux pump and the flux pump system.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

A split AC winding, which is characterized by including:

AC winding main body and several conductive magnet teeth;

The main body of the AC winding includes:

A plurality of main body iron teeth, with slots for winding coils between adjacent main body iron teeth; and an AC winding;

One end of the conductive magnetic teeth is connected to the main body iron teeth, and the other end of the conductive magnetic teeth is gathered in the extending direction of the main body iron teeth.
A split AC winding according to claim 1, characterized in that the main body iron teeth and the conductive magnet teeth are connected by a mortise and tenon connection, laser welding or plug connection.
A magnetic flux pump based on a split AC winding according to claim 1, characterized in that the shape and size of the end surfaces of the conductive magnetic teeth and the main body iron teeth are the same.
A split-type AC winding according to claim 1, characterized in that the magnetic conductive teeth have a one-stage structure or a two-stage structure; when the magnetic conductive teeth have a one-stage structure, the conductive magnetic teeth have The cross-sectional area of one end of the conductive teeth is the same as the cross-sectional area of the main body iron teeth. The cross-sectional area of the conductive teeth gradually decreases from the end of the conductive teeth close to the main body iron teeth. Small; when the magnet-conducting teeth have a two-stage structure, the magnet-conducting teeth include a first section of iron teeth and a second section of iron teeth; one end of the first section of iron teeth close to the main body of the iron teeth and the The cross-sectional area of one end of the main body's iron teeth is the same; the cross-sectional area of the second section of the iron teeth gradually decreases from the end of the second section of the conductive magnet teeth close to the first section of the iron teeth.
A magnetic flux pump based on split AC winding, which is characterized by including:

A split AC winding according to any one of claims 1-4;

DC winding; and

yoke;

The conductive magnetic teeth of the split AC winding extend toward and gather at the magnetic yoke, and there is an air gap between the conductive magnetic teeth and the magnetic yoke;

Wherein, the split AC winding, the DC winding, the magnetic yoke and the conductive magnetic teeth together constitute a magnetic circuit under the working state of the magnetic flux pump.
A magnetic flux pump based on split AC winding according to claim 5, characterized in that: The DC winding is provided at one or both ends of the split AC winding;

When one end of the split AC winding is provided with the DC winding, one end of the yoke is connected to the DC winding, and the other end of the yoke extends to the split AC winding away from the DC winding. One end of the winding;

When the DC winding is provided at both ends of the split AC winding, one end of the yoke is connected to the DC winding located at one end of the split AC winding, and the other end of the yoke is connected to the DC winding located at one end of the split AC winding. The DC winding at the other end of the split AC winding forms a magnetic circuit in the working state of the flux pump, and the number of the magnetic yokes is the same as the number of the magnetic circuits; the DC windings at both ends of the split AC winding The number of windings is the same.
A superconducting flux pump system based on split AC windings, which is characterized by including:

Flux pump based on split AC winding;

superconducting stator; and

superconducting load;

The superconducting stator is disposed in the air gap between the magnetic teeth and the magnetic yoke; the superconducting load is connected to the superconducting stator as a closed loop.
A superconducting flux pump system based on split AC winding according to claim 7, characterized in that the superconducting load is a high-temperature superconducting coil or a superconducting closed wire.
A superconducting flux pump system based on split AC winding according to claim 7, characterized in that the superconducting load has a pair of input terminals and an output terminal; both ends of the stator group are connected to the input terminals respectively. The line end and outlet end are connected to form a closed loop.