Rotary conduction cooling mechanism and solid powder superconducting motor

Abstract

The invention discloses a rotary conduction cooling mechanism and a solid powder superconducting motor, and belongs to the technical field of superconducting motors, the rotary conduction cooling mechanism comprises a rotary magnetic conductive yoke, rotary magnetic conductive teeth, a rotary permanent magnet, a static magnetic conductive yoke and a heat-conducting medium; the rotary permanent magnets are arranged on the inner surface of the rotary magnetic conductive yoke at intervals; the rotary magnetic conductive teeth are arranged between the adjacent rotary magnetic conductive yokes; the static magnetic conductive yoke is arranged in the center of the rotary magnetic conductive yoke in the axial direction of the rotary magnetic conductive yoke, and a gap is formed between the static magnetic conductive yoke and the rotary magnetic conductive teeth. And the heat-conducting medium is suspended in the gap, is in contact with the rotary magnetic conductive teeth and the static magnetic conductive yoke, and is used for conducting heat generated by the rotary magnetic conductive teeth to the static magnetic conductive yoke. According to the rotating conduction cooling mechanism, the heat conduction work of the rotating part and the static part is realized, the use of a low-temperature fluid medium is avoided, the use of a rotating sealing structure is also avoided, and the technical difficulty of heat conduction of the superconducting motor rotor magnet is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of superconducting motors, and more specifically, relates to a rotating conduction cooling mechanism and a solid powder superconducting motor. Background Art

[0002] A superconducting motor is a motor that uses superconducting materials to make stator or rotor magnets. It uses the zero resistance characteristics of superconducting materials to enable superconducting magnets made of superconducting materials to pass currents far greater than conventional copper windings. This technology can significantly improve the power density and torque density of the motor, and significantly reduce the weight and size of the motor.

[0003] Based on the above advantages, superconducting motors are often used in wind power generation, ship propulsion, aircraft engines and other fields. Superconducting motors can be divided into two categories: semi-superconducting motors and full superconducting motors. In semi-superconducting motors, superconducting magnets are often used to form the motor rotor; in full superconducting motors, superconducting magnets are often used to form the rotor, and superconducting tapes are used as stator armature windings.

[0004] In a motor with a rotor formed by a superconducting magnet, the superconducting magnet on the rotor needs to be cooled by the outside world. Because the magnet needs to rotate, a liquid or gas medium is often used to cool the rotor, and a rotary joint is used to connect the rotating part and the stationary part of the medium pipeline. The development cost of the rotary joint is high, and it needs to be used to seal the cryogenic fluid medium, which is very technically difficult. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a rotating conduction cooling mechanism and a solid powder superconducting motor, thereby solving the technical problem of difficulty in conduction cooling of the rotor of a traditional superconducting motor.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided a rotary conduction cooling mechanism, comprising a rotary magnetic conductive yoke, a rotary magnetic conductive tooth, a rotary permanent magnet, a stationary magnetic conductive yoke and a heat conductive medium;

[0007] The rotating permanent magnets are arranged at intervals on the inner surface of the rotating magnetic yoke; the rotating magnetic teeth are arranged between adjacent rotating magnetic yokes;

[0008] The stationary magnetic yoke is arranged at the center of the rotating magnetic yoke along the axial direction of the rotating magnetic yoke, and a gap is provided between the stationary magnetic yoke and the rotating magnetic teeth;

[0009] The heat-conducting medium is suspended in the gap and is in contact with the rotating magnetically conductive teeth and the stationary magnetically conductive yoke respectively. The heat-conducting medium is used for conducting the heat generated by the rotating magnetically conductive teeth to the stationary magnetically conductive yoke.

[0010] Preferably, the heat-conducting medium is formed by a plurality of heat-conducting particles.

[0011] Preferably, the thermally conductive particles are copper-coated iron powder particles.

[0012] Preferably, the copper-clad iron powder particles are composed of an outer layer of copper-clad iron, and the size of the copper-clad iron powder particles is 48 μm to 150 μm.

[0013] Preferably, the thickness of the copper outer layer is 2 μm to 5 μm.

[0014] Preferably, one end of the stationary magnetic yoke is connected to a refrigerator; the stationary magnetic yoke is used to conduct the heat generated by the rotating magnetic teeth to the refrigerator via the heat-conducting medium, or to conduct the cold generated by the refrigerator to the rotating magnetic teeth via the heat-conducting medium.

[0015] According to another aspect of the present invention, there is provided a solid powder superconducting motor, comprising the above-mentioned rotary conduction cooling mechanism, and further comprising a motor stator, a motor vacuum dewar, a motor rotor and a motor shaft arranged inside the motor housing;

[0016] The motor stator is sleeved on the outside of the motor vacuum dewar;

[0017] The motor vacuum dewar is arranged outside the motor rotor;

[0018] The rotary conduction cooling mechanism is arranged in the motor rotor, and a motor shaft is arranged at one end of the rotary conduction cooling mechanism.

[0019] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0020] 1. The rotary conduction cooling mechanism and the solid powder superconducting motor proposed in the present invention are characterized in that a suspended heat-conducting medium is arranged in the gap between the stationary magnetic yoke and the rotating magnetic teeth, and the heat-conducting medium is in contact with the rotating magnetic teeth and the stationary magnetic yoke respectively. This structure realizes the heat conduction work between the rotating part and the stationary part, avoids the use of low-temperature fluid medium, and also avoids the use of a rotary sealing structure, thereby reducing the technical difficulty of heat conduction of the rotor magnet of the superconducting motor.

[0021] 2. The rotary conduction cooling mechanism and solid powder superconducting motor proposed by the present invention, wherein the heat conducting medium is copper-coated iron powder particles, the copper-coated iron powder particles can effectively connect the rotating and stationary parts, and the copper material can effectively complete the heat conduction. During the production process, the copper outer layer of the copper-coated iron powder particles can effectively protect the iron powder from being oxidized, and the copper-coated iron powder particles can effectively reduce the relative speed between the particles, effectively reducing frictional heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of a solid-state powder superconducting motor with a rotary conduction cooling mechanism of the present invention;

[0023] Figure 2 It is a structural cross-sectional view of a solid-state powder superconducting motor with a rotary conduction cooling mechanism of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the rotary conduction cooling mechanism of the present invention.

[0025] In all the drawings, the same reference numerals are used to represent the same elements or structures, among which: 21-rotating magnetic yoke; 22-rotating magnetic teeth; 23-rotating permanent magnet; 24-stationary magnetic yoke; 3-heat transfer medium; 4-refrigerator; 51-motor housing; 52-motor stator; 53-motor vacuum dewar; 54-motor rotor; 55-motor shaft. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1-3 As shown, the present invention proposes a rotary conduction cooling mechanism and a solid powder superconducting motor, which includes a motor housing 51, a motor stator 52, a motor vacuum dewar 53, a motor rotor 54, a motor shaft 55 and a rotary conduction cooling mechanism, wherein the motor stator 52, the motor vacuum dewar 53, the motor rotor 54 and the motor shaft 55 are all arranged inside the motor housing 51.

[0028] Specifically, the motor stator 52 is coaxially sleeved on the outside of the motor vacuum dewar 53, the motor vacuum dewar 53 is coaxially sleeved on the outside of the motor rotor 54, the rotary conduction cooling mechanism is arranged inside the motor rotor 54, and a motor shaft 55 is provided at one end of the motor rotor 54.

[0029] To further illustrate, the rotary conduction cooling mechanism described in the present invention includes a stationary part, a rotating part, a heat-conducting medium and a bearing. The stationary part includes a refrigerator interface, a refrigerator interface, a stationary cooling part, a permanent magnet and a magnetic yoke; the rotating part is mainly a rotating cooling part; between the rotating and stationary parts, there are bearings and a heat-conducting medium. The bearing is used to connect the rotating and stationary parts, and the heat-conducting medium is used to conduct heat from the rotating part to the stationary part.

[0030] Specifically, the rotating conduction cooling mechanism includes a rotating magnetic yoke 21, a rotating magnetic teeth 22, a rotating permanent magnet 23, a stationary magnetic yoke 24 and a heat-conducting medium 3; the rotating permanent magnet 23 is arranged at intervals on the inner surface of the rotating magnetic yoke 21; the rotating magnetic teeth 22 are arranged between adjacent rotating magnetic yokes 21; the stationary magnetic yoke 24 is arranged at the center of the rotating magnetic yoke 21 along the axial direction of the rotating magnetic yoke 21, and a gap is provided between the stationary magnetic yoke 24 and the rotating magnetic teeth 22.

[0031] As a preferred embodiment of the present invention, the heat-conducting medium 3 is formed by a plurality of heat-conducting particles, and the heat-conducting particles are copper-coated iron powder particles.

[0032] Furthermore, the copper-clad iron powder particle structure is a tiny particle of iron wrapped in copper, with a size of 100 mesh to 300 mesh, namely 48um to 150um, a copper content of 15 to 20%, and a copper thickness of 2 to 5um.

[0033] In the present invention, the stationary magnetic yoke 24 of the stationary part and the rotating magnetic teeth 22 of the rotating part form a magnetic circuit, and the magnetic circuit passes through the gap. Copper-coated iron powder particles are arranged in the gap, wherein the iron component in the copper-coated iron powder particles will cause the copper-coated iron powder particles to be suspended in the gap under the action of the magnetic field, and connect the rotating part and the stationary part. The copper-coated iron powder particles are mainly used to conduct heat, play a role of lubrication during movement, and protect the iron component to prevent the iron powder from being naturally. The rotating conduction cooling mechanism realizes the heat conduction work of the rotating part and the stationary part, avoids the use of low-temperature fluid medium, and also avoids the use of a rotating sealing structure, reducing the technical difficulty of heat conduction of the superconducting motor rotor magnet.

[0034] Further explanation, such as Figure 1 and Figure 2 As shown, the stationary magnetic yoke 24 of the stationary part of the present invention is connected to the refrigerator 4, and the heat of the magnets on the superconducting motor rotor is finally transferred to the refrigerator 4 through the copper-clad iron powder particles suspended in the gap, or the cold energy of the stationary refrigerator 4 is conducted to the superconducting motor rotor through the copper-clad iron powder particles.

[0035] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary conduction cooling mechanism, characterized in that: It comprises a rotating magnetic yoke (21), a rotating magnetic tooth (22), a rotating permanent magnet (23), a stationary magnetic yoke (24) and a heat-conducting medium (3); The rotating permanent magnets (23) are arranged at intervals on the inner surface of the rotating magnetic yoke (21); the rotating magnetic teeth (22) are arranged between adjacent rotating magnetic yokes (21); The stationary magnetic yoke (24) is arranged at the center of the rotating magnetic yoke (21) along the axial direction of the rotating magnetic yoke (21), and a gap is provided between the stationary magnetic yoke (24) and the rotating magnetic teeth (22); The heat-conducting medium (3) is suspended in the gap and is in contact with the rotating magnetic teeth (22) and the stationary magnetic yoke (24) respectively. The heat-conducting medium (3) is used to conduct heat generated by the rotating magnetic teeth (22) to the stationary magnetic yoke (24).

2. A rotary conduction cooling mechanism according to claim 1, characterized in that: The heat-conducting medium (3) is formed by the aggregation of a plurality of heat-conducting particles.

3. A rotary conduction cooling mechanism according to claim 2, characterized in that: The thermally conductive particles are copper-coated iron powder particles.

4. A rotary conduction cooling mechanism according to claim 3, characterized in that: The copper-clad iron powder particles consist of an outer layer of copper wrapped around iron, and the size of the copper-clad iron powder particles is 48 μm to 150 μm.

5. A rotary conduction cooling mechanism according to claim 4, characterized in that: The thickness of the copper outer layer is 2 μm to 5 μm.

6. A rotary conduction cooling mechanism according to claim 5, characterized in that: One end of the stationary magnetic yoke (24) is connected to a refrigerator (4); the stationary magnetic yoke (24) is used to transfer the heat generated by the rotating magnetic teeth (22) to the refrigerator (4) via the heat-conducting medium (3), or to transfer the cold generated by the refrigerator (4) to the rotating magnetic teeth (22) via the heat-conducting medium (3).

7. A solid powder superconducting motor, characterized in that: A rotary conduction cooling mechanism comprising any one of claims 1 to 6, further comprising a motor stator (52), a motor vacuum dewar (53), a motor rotor (54) and a motor shaft (55) arranged inside a motor housing (51); The motor stator (52) is sleeved on the outside of the motor vacuum dewar (53); The motor vacuum dewar (53) is arranged outside the motor rotor (54); The motor rotor (54) is provided with the rotary conduction cooling mechanism, and one end of the rotary conduction cooling mechanism is provided with a motor shaft (55).

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