High-dynamic high-reliability low-loss superconducting motor suitable for moon-based casting

Abstract

The invention relates to the technical field of electromagnetic propulsion, and discloses a high-dynamic high-reliability low-loss superconducting motor suitable for lunar-based casting. The superconducting motor is an axial magnetic flux motor and comprises a motor rotor, a motor stator, an outer Dewar bottom plate, an outer Dewar side plate, an outer Dewar cover plate and a mounting base, the outer Dewar bottom plate, the outer Dewar side plate and the outer Dewar cover plate integrally form a circular-ring-shaped closed cavity, the circular-ring-shaped closed cavity is arranged on the base, and the outer Dewar cover plate is arranged on the mounting base. The motor stators are arranged in the annular closed cavity, the motor rotors are arranged below the two ends of the rotary arm, the cantilever is connected with the bearing, a return device is arranged above one end of the cantilever, and the bearing is arranged at the circle center position of the annular closed cavity.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic propulsion technology, and in particular to a high-dynamic, high-reliability, low-loss superconducting motor suitable for moon-based ejection. Background Art

[0002] The development and utilization of lunar resources has become a current research hotspot. In order to transport lunar resources back to Earth in a repeatable, low-cost, and high-frequency manner, a highly reliable ejection solution needs to be designed. The magnetic levitation rotary propulsion device mainly uses a rotary motor device and an electric suspension device to provide ultra-high-speed propulsion and stable suspension functions for the transportation of lunar resources.

[0003] A rotary ejection scheme based on a conventional rotary motor is proposed in the prior art. The motor corresponding to this scheme is a normal conduction radial flux motor, and the rotary arm is driven to rotate by the motor acceleration, and finally the electromagnetic torque is transmitted to the return device.

[0004] However, the existing rotary projectile scheme has the following main disadvantages: the rotary projectile based on the conventional rotary motor is essentially an indirect drive, that is, the electromagnetic torque of the motor is transmitted to the swing arm through the bearing and then to the return device. When the return device reaches the projectile speed, the stress concentration of the mechanical interface between the bearing and the swing arm can easily cause serious structural deformation or even damage, resulting in projectile failure. Summary of the invention

[0005] The present invention provides a high-dynamic, high-reliability, low-loss superconducting motor suitable for moon-based ejection, which can solve the technical problems in the prior art.

[0006] The present invention provides a high-dynamic, high-reliability, low-loss superconducting motor suitable for lunar-based ejection, wherein the superconducting motor is an axial flux motor, comprising a motor mover, a motor stator, an outer dewar bottom plate, an outer dewar side plate, an outer dewar cover plate and a mounting base, wherein the outer dewar bottom plate, the outer dewar side plate and the outer dewar cover plate form a circular annular closed cavity as a whole, the circular annular closed cavity is arranged on the base, the motor stator is arranged in the circular annular closed cavity, the motor mover is arranged below the two ends of the rotary arm, the cantilever is connected to the bearing and a return device is arranged above one end of the cantilever, and the bearing is arranged at the center of the circular annular closed cavity.

[0007] Preferably, the motor mover comprises a base plate, a magnetic steel array and a cover plate, and the magnetic steel array is arranged between the base plate and the cover plate.

[0008] Preferably, the magnetic steel array is in the form of a Halbach array, and the base plate and the cover plate are made of non-magnetic low-conductivity material.

[0009] Preferably, the motor mover is fixed below both ends of the swing arm by means of bolt assemblies.

[0010] Preferably, the material of the outer Dewar bottom plate, the outer Dewar side plate and the outer Dewar cover plate is epoxy resin.

[0011] Preferably, the motor stator comprises a superconducting coil and a superconducting frame, and the superconducting coil is formed by winding a high-temperature superconducting tape spiral bundled cable on the superconducting frame.

[0012] Preferably, the annular closed cavity is a vacuum environment.

[0013] Preferably, a vacuum nozzle, a motor terminal and a refrigerator are provided on the outer Dewar bottom plate.

[0014] Through the above technical solution, the corresponding return device is directly connected to the motor rotor, and the shaft only acts as a constraint device for rotational motion, rather than a force transmission device for electromagnetic torque; and the use of axial flux motors has higher torque density and is more suitable for the "disc-shaped" structure corresponding to the rotating projection. In addition, superconducting tapes increase the conductor current density and reduce electromagnetic losses, which will further improve the motor efficiency and power density, and have the advantages of high dynamics, high reliability and low loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of the outer structure of a high-dynamic, high-reliability, low-loss superconducting motor suitable for moon-based ejection according to an embodiment of the present invention is shown;

[0017] Figure 2 A schematic diagram of the bottom structure of a superconducting motor according to an embodiment of the present invention is shown;

[0018] Figure 3 An exploded view of the coils, structures and refrigeration components corresponding to the stator module of a superconducting motor according to an embodiment of the present invention is shown;

[0019] Figure 4 A partial schematic diagram of a superconducting coil cooling path according to an embodiment of the present invention is shown.

[0020] Figure 5 A global schematic diagram of a superconducting coil cooling path according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. 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 are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] Figure 1 A schematic diagram of the outer structure of a high-dynamic, high-reliability, low-loss superconducting motor suitable for moon-based ejection according to an embodiment of the present invention is shown.

[0025] like Figure 1As shown, an embodiment of the present invention provides a high-dynamic, high-reliability, low-loss superconducting motor suitable for lunar-based ejection, wherein the superconducting motor is an axial flux motor, including a motor mover 1, a motor stator, an outer dewar bottom plate, an outer dewar side plate 2, an outer dewar cover plate 3 and a mounting base 4, wherein the outer dewar bottom plate, the outer dewar side plate 2 and the outer dewar cover plate 3 form a circular annular closed cavity as a whole, the circular annular closed cavity is arranged on the base 4, the motor stator is arranged in the circular annular closed cavity, the motor mover 1 is arranged below the two ends of the swing arm 7, the cantilever 7 is connected to the bearing 8 and a return device 5 is arranged above one end of the cantilever 7, and the bearing 8 is arranged at the center of the circular annular closed cavity.

[0026] The bearing may be a magnetic bearing or a mechanical bearing.

[0027] Through the above technical solution, the corresponding return device can be directly connected to the motor rotor, and the shaft only acts as a constraint device for rotational motion, rather than a force transmission device for electromagnetic torque; and the use of axial flux motors has higher torque density and is more suitable for the "disc-shaped" structure corresponding to rotating projection. In addition, superconducting tapes increase the conductor current density and reduce electromagnetic losses, which will further improve motor efficiency and power density, and have the advantages of high dynamics, high reliability and low loss.

[0028] According to an embodiment of the present invention, the motor mover 1 includes a base plate, a magnetic steel array and a cover plate, and the magnetic steel array is arranged between the base plate and the cover plate.

[0029] According to one embodiment of the present invention, the magnetic steel array is in the form of a Halbach array, and the base plate and the cover plate are made of non-magnetic low-conductivity material.

[0030] According to an embodiment of the present invention, the motor mover 1 is fixed below the two ends of the swing arm 7 by means of bolt assemblies 6 .

[0031] According to an embodiment of the present invention, the material of the outer Dewar bottom plate, the outer Dewar side plate 2 and the outer Dewar cover plate 3 is epoxy resin.

[0032] As a result, the eddy current loss of the motor stator can be reduced when the stator coil of the superconducting motor is subjected to AC excitation.

[0033] According to an embodiment of the present invention, the motor stator comprises a superconducting coil and a superconducting frame, and the superconducting coil is formed by winding a high-temperature superconducting tape spiral bundled cable on the superconducting frame.

[0034] According to an embodiment of the present invention, the annular sealed cavity is a vacuum environment.

[0035] Specifically, by evacuating the annular closed cavity to obtain a vacuum environment, the superconducting motor suitable for moon-based ejection described in the present invention can be used in the surface environment.

[0036] According to an embodiment of the present invention, Figure 2 As shown, a vacuum nozzle 10, a motor terminal 11 and a refrigerator 12 are arranged on the outer Dewar bottom plate 9.

[0037] Thus, vacuuming can be performed through a vacuum nozzle when necessary. The refrigerator can be used to cool the superconducting coil through the cooling path. The motor terminal is mainly used to connect with the converter to generate electromagnetic torque to drive the motor rotor to rotate.

[0038] In order to meet the different needs of lunar-based ejection, the superconducting motor stator can adopt a modular design. The coil, structure and refrigeration component explosion diagram corresponding to the superconducting motor stator module are shown in the figure below. Figure 3 As shown. Among them, the superconducting coil 23 can be formed by winding a high-temperature superconducting tape spiral bundled cable (referred to as "CORC cable") through a coil skeleton 22, and is positioned and fixed by a coil substrate 27 and a coil cover plate 21, and the superconducting coil 23 has a coil lead 24. The support 28 is used to ensure the support and fixation of the outer Dewar cavity, and the inner ring connecting block 34 and the outer ring connecting block 35 can be used for mechanical and electrical connections between adjacent superconducting motor stator modules. In order to ensure effective cooling of the superconducting coil under AC excitation and reduce eddy current losses, the superconducting coil 22 is connected to the secondary cold head 33 of the refrigeration compressor 31 through a cooling path formed by a cooling adapter column 25 made of high thermal conductivity material, a slotted cooling belt 26 and an integrated cooling belt 29, and the cold shield 30 is connected to the primary cold head 32 of the refrigeration compressor 31. A partial schematic diagram of the superconducting coil cooling path is shown in Figure 4 As shown, the global schematic diagram of the superconducting coil cooling path is as follows Figure 5 shown.

[0039] The following describes a high-dynamic, high-reliability, low-loss superconducting motor suitable for moon-based ejection according to the present invention with reference to examples. Specifically:

[0040] 1) The motor mover consisting of a magnetic steel array, a base plate and a cover plate is installed and fixed to both ends of the swing arm through a bolt assembly, and the rotation center of the swing arm is mechanically connected to the bearing.

[0041] 2) For the superconducting motor stator module: ① Complete the installation of the refrigerator and the integrated cooling belt with the outer dewar bottom plate, the outer dewar side plate and the support. ② Embed the slotted cooling belt and the cooling adapter column in the slotted area of ​​the coil substrate cooling device, and install and fix them through the support. ③ The CORC cable completes the winding of all superconducting coils based on the coil skeleton, and completes the connection of the coil leads between adjacent coils after embedding the coil substrate equipped with the slotted cooling belt and the cooling adapter column, and then uses the potting glue for potting and casting, and covers the coil cover plate for curing.

[0042] 3) The stator modules that make up all the superconducting motors are electrically and mechanically connected through the outer ring connecting blocks and the inner ring connecting blocks, and are finally sealed through the outer Dewar cover.

[0043] 4) For the fully assembled superconducting motor stator, ① determine whether to evacuate the motor through the vacuum nozzle according to the ground / lunar environment. ② Turn on the refrigerator and cool the superconducting coil to the temperature range required for the superconducting state through the cooling path. ③ Apply the specified AC current / voltage excitation to the motor wiring circle, and the superconducting motor stator coil generates an axially rotating traveling wave magnetic field, which interacts with the magnetic field generated by the magnetic steel array of the motor rotor to generate electromagnetic torque, driving the return device installed at the end of the arm and the arm to perform rotational acceleration / uniform motion.

[0044] It can be seen from the above embodiments that the high-dynamic, high-reliability, low-loss superconducting motor suitable for moon-based ejection according to the present invention has at least the following advantages:

[0045] (1) The use of "axial magnetic flux form" + "CORC superconducting cable superconducting tape" not only achieves a significant increase in the torque density of the ejection propulsion device, but also can directly transmit the electromagnetic torque to the return device carrying lunar resources.

[0046] (2) The outer Dewar cover is made of epoxy resin material with good sealing properties, which completely eliminates the eddy current loss caused by the conductive characteristics of the outer Dewar cover, can meet the high-speed normal operation of the superconducting motor under the action of high-frequency current, and improves the efficiency of the motor.

[0047] (3) The integrated cooling belt, slotted cooling belt and cooling adapter column serve as the cooling path between the secondary cold head and the superconducting coil of the superconducting motor. Without affecting the cooling effect of the superconducting motor, the eddy current loss of the superconducting motor stator cooling path is greatly reduced, contributing a large temperature margin to the superconducting motor stator coil.

[0048] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-dynamic, high-reliability, low-loss superconducting motor suitable for lunar-based ejection, characterized in that: The superconducting motor is an axial flux motor, comprising a motor mover (1), a motor stator, an outer dewar bottom plate, an outer dewar side plate (2), an outer dewar cover plate (3) and a mounting base (4), wherein the outer dewar bottom plate, the outer dewar side plate (2) and the outer dewar cover plate (3) form a circular annular closed cavity as a whole, the circular annular closed cavity is arranged on the base (4), the motor stator is arranged in the circular annular closed cavity, the motor mover (1) is arranged below the two ends of a rotary arm (7), the cantilever (7) is connected to a bearing (8) and a return device (5) is arranged above one end of the cantilever (7), and the bearing (8) is arranged at the center of the circular annular closed cavity.

2. The superconducting motor according to claim 1, characterized in that: The motor mover (1) comprises a base plate, a magnetic steel array and a cover plate, wherein the magnetic steel array is arranged between the base plate and the cover plate.

3. The superconducting motor according to claim 2, characterized in that: The magnetic steel array is in the form of a Halbach array, and the bottom plate and the cover plate are made of non-magnetic and low-conductivity materials.

4. The superconducting motor according to claim 3, characterized in that: The motor mover (1) is fixed below the two ends of the swing arm (7) via bolt assemblies (6).

5. The superconducting motor according to claim 4, characterized in that: The material of the outer Dewar bottom plate, the outer Dewar side plate (2) and the outer Dewar cover plate (3) is epoxy resin.

6. The superconducting motor according to claim 5, characterized in that: The motor stator comprises a superconducting coil and a superconducting frame. The superconducting coil is formed by winding a high-temperature superconducting tape spiral bundled cable on the superconducting frame.

7. The superconducting motor according to claim 1, characterized in that: The annular closed cavity is a vacuum environment.

8. The superconducting motor according to claim 6, characterized in that: The outer Dewar bottom plate is provided with a vacuum nozzle, a motor connection terminal and a refrigerator.

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