A rotor superconducting magnet structure, motor rotor and superconducting synchronous phase-modulated motor

Abstract

The present application provides a rotor superconducting magnet structure, a motor rotor, and a superconducting synchronous phase-modulated motor. The rotor superconducting magnet structure includes: a heat exchange tube, a heat exchange antenna, and a superconducting coil. The heat exchange tube is fixedly mounted on a frame, and a heat exchange refrigerant is contained in the heat exchange tube. The heat exchange antenna includes a plurality of first heat exchange antennas, wherein the first heat absorption ends of the plurality of first heat exchange antennas contact the respective heat-generating parts of the two end surfaces of the superconducting coil, and the first heat release ends of the first heat exchange antennas contact the heat exchange tube. The present application achieves the technical effect of ensuring good heat dissipation while making the installation and fixation of the rotor superconducting heat dissipation structure and the current lead easier, without affecting the transmission of the detection signal. It solves the technical problem that the use of a low-temperature refrigerant to dissipate heat from the rotor superconducting magnet structure causes great difficulties in the installation and fixation of the superconducting magnet, the current lead, and the vacuum seal, and is not conducive to the feedthrough of the detection signal in an extremely low-temperature liquid environment.

Description

Technical Field

[0001] The present application relates to the field of superconducting motors, and in particular to a rotor superconducting magnet structure, a motor rotor, and a superconducting synchronous phase-modulated motor. Background Art

[0002] High-temperature superconducting materials have excellent properties such as high current carrying capacity and no DC resistance. With the increasing maturity of high-temperature superconducting material production technology and the continuous reduction of production costs, the application of high-temperature superconducting materials in the rotor of synchronous phase-modulated motors as superconducting magnet structures can effectively increase the corresponding speed of synchronous phase-modulated motors, improve the rotor insulation aging problem in traditional phase-modulated motors, and extend the service life of synchronous phase-modulated motors.

[0003] When developing superconducting synchronous condensers, technicians in this field generally use a low-temperature refrigerant to completely immerse the rotor superconducting magnet structure in a heat dissipation solution. However, for large rotor superconducting magnet structures, the use of a low-temperature refrigerant to completely immerse the rotor superconducting magnet will cause great difficulties in the installation and fixation of the superconducting magnet, the current lead and the vacuum seal. In addition, it is not conducive to the feedthrough of the detection signal in an extremely low-temperature liquid environment, resulting in poor detection of the superconducting magnet. Summary of the Invention

[0004] The purpose of this application is to provide a rotor superconducting magnet structure, a motor rotor and a superconducting synchronous phase-modulated motor, so as to solve the technical problem that the use of a low-temperature refrigerant to dissipate heat from the rotor superconducting magnet structure will cause great difficulties in the installation and fixation of the superconducting magnet, the current lead and the vacuum sealing, and is not conducive to the feedthrough of the detection signal in an extremely low-temperature liquid environment, resulting in poor detection effect on the superconducting magnet.

[0005] In view of this, the first aspect of the present application provides a rotor superconducting magnet structure, comprising: a heat exchange tube, a heat exchange antenna, a superconducting coil, a skeleton and a protective frame;

[0006] The protection frame is fixedly arranged on the side wall of the outer ring of the superconducting coil, and the skeleton is fixedly connected to the side wall of the inner ring of the superconducting coil;

[0007] The heat exchange tube is fixedly arranged on the frame, and the heat exchange refrigerant is filled in the heat exchange tube;

[0008] The heat exchange antenna includes multiple first heat exchange antennas, each of which is provided with a first heat absorption end and a first heat release end. The first heat absorption ends of the multiple first heat exchange antennas are in conflict with the respective heating parts of the two end surfaces of the superconducting coil, and the first heat release ends of the first heat exchange antennas are in conflict with the heat exchange tube.

[0009] Furthermore, the heat exchange antenna also includes a plurality of second heat exchange antennas;

[0010] The second heat exchange antenna is provided with a second heat absorption end and a second heat release end. The second heat absorption ends of multiple second heat exchange antennas conflict with the various heating parts on the two end surfaces of the skeleton, and the second heat release ends of multiple second heat exchange antennas conflict with the heat exchange tube.

[0011] Furthermore, the heat exchange antenna further includes a plurality of third heat exchange antennas;

[0012] The third heat exchange antenna is provided with a third heat absorption end and a third heat release end. The third heat absorption ends of multiple third heat exchange antennas conflict with the various heating parts on the two end surfaces of the protection frame, and the third heat release ends of multiple third heat exchange antennas conflict with the heat exchange tube.

[0013] Furthermore, the heat exchange antenna is bent.

[0014] Furthermore, the heat exchange tube is fixedly arranged on the end surface edge of the protection frame.

[0015] Furthermore, the cross-sectional area of the heat exchange antenna is between 0.125 mm and 1 mm.

[0016] Furthermore, low-temperature thermal conductive glue is applied on the contact parts of the heat-absorbing end and the heat-releasing end of the heat exchange antenna.

[0017] Furthermore, the heat exchange refrigerant is liquid nitrogen.

[0018] A second aspect of the present application provides a motor rotor, comprising the above-mentioned rotor superconducting magnet structure, a rotor core and a rotating shaft;

[0019] The rotor superconducting magnet structure is fixedly arranged on the outer side wall of the rotor core;

[0020] The rotor core is fixedly arranged on the rotating shaft.

[0021] A third aspect of the present application provides a superconducting synchronous phase-modulated motor, comprising the motor rotor and stator described above;

[0022] The motor rotor is rotatably arranged in the inner cavity of the stator.

[0023] Compared with the prior art, the advantages of the embodiments of the present application are:

[0024] The present application provides a rotor superconducting magnet structure, comprising: a heat exchange tube, a heat exchange antenna, a superconducting coil, a skeleton and a protective frame; the protective frame is fixedly arranged on the side wall of the outer ring of the superconducting coil, and the skeleton is fixedly connected to the side wall of the inner ring of the superconducting coil; the heat exchange tube is fixedly arranged on the skeleton, and a heat exchange refrigerant is filled in the heat exchange tube; the heat exchange antenna comprises a plurality of first heat exchange antennas, the first heat exchange antenna being provided with a first heat absorption end and a first heat release end, the first heat absorption ends of the plurality of first heat exchange antennas being in conflict with the respective heating parts of the two end surfaces of the superconducting coil, and the first heat release ends of the first heat exchange antenna being in conflict with the heat exchange tube.

[0025] The high-temperature superconducting magnet structure provided in the present application is provided with a heat exchange tube on the protective frame, and a heat exchange refrigerant is transported in the heat exchange tube. The first heat release end of the first heat exchange antenna is in conflict with the heat exchange tube, and the first heat absorption end of the first heat exchange antenna is in conflict with each heating part of the two end surfaces of the superconducting coil, so that the heat generated at each position of the superconducting coil can be conducted to the first heat absorption end through the two end surfaces, and then the first heat absorption end conducts the heat to the first heat release end through the first heat exchange antenna for heat release, and the heat is taken away by the heat exchange tube, replacing the heat dissipation method of completely immersing the rotor superconducting magnet structure in a low-temperature refrigerant, achieving the technical effect of ensuring good heat dissipation function while making the installation and fixation of the rotor superconducting heat dissipation structure and the current lead simpler, without affecting the transmission of the detection signal, and solving the technical problem that the use of a low-temperature refrigerant heat dissipation method to dissipate heat for the rotor superconducting magnet structure will cause great difficulties in the installation and fixation of the superconducting magnet, the current lead and the vacuum sealing, and is not conducive to the feedthrough of the detection signal in an extremely low-temperature liquid environment, resulting in poor detection effect of the superconducting magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A schematic structural diagram of a rotor superconducting magnet structure provided in an embodiment of the present application;

[0028] Among them, the accompanying drawings are marked as: heat exchange tube 1, superconducting coil 2, skeleton 3, protective frame 4, first heat exchange antenna 10, first heat absorption end 11, first heat release end 12, second heat exchange antenna 20, second heat absorption end 21, second heat release end 22, third heat exchange antenna 30, third heat absorption end 31, third heat release end 32. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application.

[0032] Among the existing solutions, the complete immersion of cryogenic refrigerant is subject to many limitations in the installation and fixation of large superconducting magnets, the ultra-low temperature feedthrough of current leads and monitoring signal lines, and vacuum sealing, and cannot well meet the requirements of complex working conditions in actual industrial scenarios.

[0033] In addition to the solution of complete immersion in low-temperature refrigerant, the solution of using multiple refrigerators for enhanced cooling is also a very common heat dissipation solution. However, the solution of using multiple refrigerators for cooling is limited by the installation space of the rotor superconducting magnet, resulting in a limited number of refrigerators to be installed, and it does not have a good heat dissipation function. On the other hand, the superconducting coils will also have a higher temperature after being absorbed by the skeleton, cover and protective frame of the superconducting magnet, which will lead to uneven temperature of the superconducting coils, resulting in some parts being overcooled and some parts being overheated.

[0034] This application provides a rotor superconducting magnet structure. For ease of understanding, please refer to Figure 1 , Figure 1 A schematic structural diagram of a rotor superconducting magnet structure provided in an embodiment of the present application;

[0035] It includes heat exchange tubes 1, heat exchange antennae, superconducting coils 2, skeletons 3 and protective frames 4;

[0036] The protection frame 4 is fixedly arranged on the side wall of the outer ring of the superconducting coil 2, and the skeleton 3 is fixedly connected to the side wall of the inner ring of the superconducting coil 2;

[0037] The heat exchange tube 1 is fixedly mounted on the frame 3 and is filled with a heat exchange refrigerant;

[0038] The heat exchange antennae include a plurality of first heat exchange antennae 10, each of which is provided with a first heat absorption end 11 and a first heat release end 12. The first heat absorption ends 11 of the plurality of first heat exchange antennae 10 are in contact with the respective heating parts on the two end surfaces of the superconducting coil 2, and the first heat release ends 12 of the first heat exchange antennae 10 are in contact with the heat exchange tube 1.

[0039] It should be noted that the protective frame 4 is fixedly arranged on the side wall of the outer ring of the superconducting coil 2 to protect the outer ring of the superconducting coil 2 from damage. The material used for the protective frame 4 is copper, aluminum and its alloys with good thermal conductivity, which can effectively conduct heat from the side wall of the outer ring of the superconducting coil 2.

[0040] The skeleton 3 is fixedly connected to the side wall of the inner circle of the superconducting coil 2. The skeleton 3 serves as a support frame for the superconducting coil 2. The material used is copper, aluminum and its alloys with good thermal conductivity, which can effectively conduct heat from the inner side wall of the superconducting coil 2.

[0041] Heat exchange tube 1 utilizes a square outer tube structure with a round inner tube, ensuring that the outer portion of heat exchange tube 1 closely contacts the first heat-releasing end 12 of first heat exchange antenna 10, enabling first heat-releasing end 12 to better transfer heat to the wall of heat exchange tube 1. In this embodiment, heat exchange tube 1 can be a separate straight tube or a series of special-shaped tubes. The installation location is selected to have a relatively weak magnetic field to avoid the generation of eddy currents. Heat exchange tube 1 is made of copper, which has excellent thermal conductivity. Of course, in addition to copper, aluminum alloys, stainless steel, and other materials can also be used.

[0042] The material of the first heat exchange antenna 10 is a material with good thermal conductivity, such as copper or aluminum alloy. The first heat absorption ends 11 of multiple first heat exchange antennas 10 are densely distributed on the two end surfaces of the superconducting coil 2. Therefore, the resistance points can be accurately set according to the main heat generating locations on the two end surfaces of the superconducting coil 2, so that the first heat absorption ends 11 absorb the heat of the superconducting coil 2 at the resistance points, achieving precise heat absorption. The first heat exchange antenna 10, the heat exchange tube 1, the superconducting coil 2, the skeleton 3 and the protective frame 4 are integrally cured with epoxy low-temperature resin to ensure the structural strength of the entire rotor superconducting magnet.

[0043] The high-temperature superconducting magnet structure provided in the present application has a heat exchange tube 1 provided on the protective frame 4, in which a heat exchange refrigerant is transferred, and the first heat release end 12 of the first heat exchange antenna 10 conflicts with the heat exchange tube 1, and the first heat absorption end 11 of the first heat exchange antenna 10 conflicts with each heating part of the two end surfaces of the superconducting coil 2, so that the heat generated at each position of the superconducting coil 2 can be conducted to the first heat absorption end 11 through the two end surfaces, and then the first heat absorption end 11 conducts the heat through the first heat exchange antenna 10 to the first heat release end 12 for heat release, and the heat is released through the heat exchange tube 1. The heat is taken away, replacing the heat dissipation method of completely immersing the rotor superconducting magnet structure in a low-temperature refrigerant, achieving the technical effect of ensuring good heat dissipation function while making the installation and fixation of the rotor superconducting heat dissipation structure and the current lead simpler, without affecting the transmission of the detection signal. It solves the technical problem that the use of a low-temperature refrigerant to dissipate heat from the rotor superconducting magnet structure will cause great difficulties in the installation and fixation of the superconducting magnet, the current lead and the vacuum sealing, and is not conducive to the feedthrough of the detection signal in an extremely low-temperature liquid environment, resulting in poor detection effect on the superconducting magnet.

[0044] As a further improvement, the heat exchange antenna provided in the embodiment of the present application further includes a plurality of second heat exchange antennas 20;

[0045] The second heat exchange antenna 20 is provided with a second heat absorption end 21 and a second heat release end 22. The second heat absorption ends 21 of the multiple second heat exchange antennas 20 conflict with the various heating parts of the two end surfaces of the skeleton 3, and the second heat release ends 22 of the multiple second heat exchange antennas 20 conflict with the heat exchange tube 1.

[0046] Specifically, the second heat-absorbing end 21 and the second heat-releasing end 22 of the second heat-exchange tentacle 20 are respectively connected to the skeleton 3 and the heat-exchange tube 1. Since the skeleton 3 itself absorbs the heat on the side wall of the inner ring of the superconducting coil 2, the skeleton 3 has a higher temperature. Therefore, the second heat-exchange tentacle 20 can make the second heat-absorbing end 21 precisely contact the hot spot according to the end face of the skeleton 3, thereby realizing precise heat dissipation of the skeleton 3 and avoiding local overheating of the skeleton 3.

[0047] As a further improvement, the heat exchange antenna provided in the embodiment of the present application further includes a plurality of third heat exchange antennas 30;

[0048] The third heat exchange antenna 30 is provided with a third heat absorption end 31 and a third heat release end 32. The third heat absorption ends 31 of multiple third heat exchange antennas 30 conflict with the various heating parts on the two end surfaces of the protection frame 4, and the third heat release ends 32 of multiple third heat exchange antennas 30 conflict with the heat exchange tube 1.

[0049] Specifically, the third heat-absorbing end 31 and the third heat-releasing end 32 of the third heat-exchange antenna 30 are respectively connected to the protective frame 4 and the heat-exchange tube 1. Since the protective frame 4 itself absorbs the heat on the side wall of the outer ring of the superconducting coil 2, the protective frame 4 has a higher temperature. Therefore, the third heat-exchange antenna 30 can make the third heat-absorbing end 31 precisely contact the heating point according to the heating end on the end face of the protective frame 4, thereby realizing precise heat dissipation of the protective frame 4 and avoiding local overheating of the protective frame 4.

[0050] As a further improvement, the heat exchange tentacles provided in the embodiment of the present application are bent, and the bending angle is 90°. The bending points on different heat exchange tentacles are different, so that the heat exchange tentacles are staggered in their length and height, which is conducive to avoiding the generation of eddy currents.

[0051] As a further improvement, the heat exchange tubes 1 of the rotor superconducting magnet structure provided in the present embodiment are fixedly mounted on the end edges of the protective frame 4, specifically on two opposing edges of the large end face of the protective frame, parallel to the end face edges. This maximizes space for the heat exchange antennae. Furthermore, the end edges of the large end face of the protective frame 4 are located where the magnetic field is weak, effectively preventing the generation of eddy currents.

[0052] As a further improvement, the cross-sectional area of the heat exchange antenna of the rotor superconducting magnet structure provided in the embodiment of the present application is between 0.125 mm and 0.1 mm. The use of an extremely small cross-street area is conducive to limiting the eddy currents generated by the influence of the motor magnetic field on the heat exchange antenna to an extremely small range, effectively suppressing the influence of the eddy currents and reducing energy loss.

[0053] As a further improvement, the contact parts of the heat absorbing end and the heat releasing end of the heat exchange tentacles of the rotor superconducting magnet structure provided in the embodiment of the present application are coated with low-temperature thermal conductive glue, thereby ensuring good thermal contact between the heat absorbing end and the superconducting coil 2 and between the heat releasing end and the heat exchange tube 1. Of course, in addition to using low-temperature thermal conductive glue, gold plating and other methods can also be used to achieve good thermal contact effects.

[0054] As a further improvement, the heat exchange refrigerant of the rotor superconducting magnet structure provided in the embodiment of the present application is liquid nitrogen. Liquid nitrogen has good heat absorption effect and easy vaporization, can instantly absorb a large amount of heat, and ensure the smoothness of heat transfer. Of course, in addition to liquid nitrogen, liquid helium, liquid neon, low-temperature helium, etc. can also be used as a heat exchange refrigerant.

[0055] A second aspect of the present application provides a motor rotor, comprising the rotor superconducting magnet structure, a rotor core, and a rotating shaft in the above embodiment;

[0056] The rotor superconducting magnet structure is fixedly arranged on the outer side wall of the rotor core;

[0057] The rotor core is fixed on the rotating shaft.

[0058] The motor rotor provided in the present application has a superconducting magnet structure, which improves the rotor response speed while having good heat dissipation performance, increases the life of the motor rotor, and has a more compact structure.

[0059] A third aspect of the present application provides a superconducting synchronous condenser, comprising the motor rotor and stator described above;

[0060] The motor shaft is rotatably arranged in the inner cavity of the stator.

[0061] The synchronous phase-modulated motor provided in the present application has good response speed and high cooling efficiency, which increases the service life of the synchronous phase-modulated motor while reducing the cooling cost.

[0062] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotor superconducting magnet structure, characterized in that: include: Heat exchange tubes, heat exchange antennae, superconducting coils, skeletons and protective frames; The protection frame is fixedly arranged on the side wall of the outer ring of the superconducting coil, and the skeleton is fixedly connected to the side wall of the inner ring of the superconducting coil; The heat exchange tube is fixedly arranged on the frame, and the heat exchange refrigerant is filled in the heat exchange tube; The heat exchange antenna comprises a plurality of first heat exchange antennas, each of which is provided with a first heat absorbing end and a first heat releasing end. The first heat absorbing ends of the plurality of first heat exchange antennas are in contact with the respective heat generating portions of the two end surfaces of the superconducting coil, and the first heat releasing ends of the first heat exchange antennas are in contact with the heat exchange tube. The heat exchange antenna also includes a plurality of second heat exchange antennae; The second heat exchange antenna is provided with a second heat absorbing end and a second heat releasing end. The second heat absorbing ends of the plurality of second heat exchange antennas are in conflict with the respective heat generating parts of the two end surfaces of the frame, and the second heat releasing ends of the plurality of second heat exchange antennas are in conflict with the heat exchange tube. The heat exchange antennae further include a plurality of third heat exchange antennae; The third heat exchange antenna is provided with a third heat absorbing end and a third heat releasing end. The third heat absorbing ends of the plurality of third heat exchange antennas conflict with the respective heat generating parts of the two end surfaces of the protection frame, and the third heat releasing ends of the plurality of third heat exchange antennas conflict with the heat exchange tube. The heat exchange tube is fixedly arranged on the end surface edge of the protection frame.

2. The rotor superconducting magnet structure according to claim 1, characterized in that: The heat exchange antenna is bent.

3. The rotor superconducting magnet structure according to claim 1, characterized in that: The cross-sectional area of the heat exchange antenna is between 0.125 mm and 1 mm.

4. The rotor superconducting magnet structure according to claim 1, characterized in that: The contact parts of the heat absorbing end and the heat releasing end of the heat exchange antenna are both coated with low-temperature thermal conductive glue.

5. The rotor superconducting magnet structure according to claim 1, characterized in that: The heat exchange refrigerant is liquid nitrogen.

6. A motor rotor, characterized in that: The invention comprises the rotor superconducting magnet structure, the rotor core and the rotating shaft according to any one of claims 1 to 5; The rotor superconducting magnet structure is fixedly arranged on the outer side wall of the rotor core; The rotor core is fixedly arranged on the rotating shaft.

7. A superconducting synchronous phase-modulated motor, characterized in that: The motor rotor and stator according to claim 6; The motor rotor is rotatably arranged in the inner cavity of the stator.

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