Annular Stator Structure and Its Superconducting Motor

Abstract

The present application discloses an annular stator structure and a superconducting motor thereof. The annular stator structure is used to cooperate with superconducting coils on a rotor. The superconducting coils are in a racetrack shape and include two straight segments and two curved segments. The annular stator structure includes a non-magnetic tooth portion segment, a first magnetic segment, a second magnetic segment, a third magnetic segment, and a plurality of windings. The magnetic permeability of the second magnetic segment is greater than that of the first magnetic segment and less than that of the third magnetic segment, and the saturation magnetization intensity of the second magnetic segment is less than that of the first magnetic segment and greater than that of the third magnetic segment. The superconducting motor includes the annular stator structure. Through the above settings, the utilization rate of the curved segments of the superconducting coils can be improved to increase the power of the superconducting motor, and the magnetic leakage of the curved segments can be reduced to improve the operation stability of the superconducting motor.

Description

Technical Field

[0001] This application relates to the technical field of motors, and in particular to an annular stator structure and a superconducting motor thereof. Background Art

[0002] A motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. Among them, a superconducting motor refers to a motor in which the excitation winding is made of superconducting materials and can be wound with wires that can carry high-density currents under strong magnetic fields.

[0003] Superconducting coils are usually arranged in the rotor of a superconducting motor to increase the induced magnetic field in the motor and thus improve the power of the superconducting motor. Superconducting coils in the prior art are usually racetrack-shaped, that is, superconducting coils usually include straight segments extending along a straight line and curved segments extending along an arc. The stator structure in the prior art usually only utilizes the straight segments with a larger magnetic field intensity and does not utilize the magnetic field generated by the curved segments of the superconducting coils, resulting in waste of the superconducting coils. Secondly, the magnetic field generated by the unutilized curved segments of the superconducting coils will cause magnetic leakage of the superconducting coils, and the magnetic force formed by the magnetic leakage will not only exacerbate the vibration of the rotor, but also cause the stator winding to bend, increasing the operation risk of the motor and reducing the service life of the motor.

[0004] Therefore, how to improve the utilization rate of the curved segments of superconducting coils is a technical problem that those skilled in the art continue to solve. Summary of the Invention

[0005] To solve the deficiencies of the prior art, the purpose of this application is to provide an annular stator structure and a superconducting motor thereof with a high utilization rate of the curved segments of superconducting coils.

[0006] To achieve the above purpose, this application adopts the following technical solutions:

[0007] An annular stator structure is used in cooperation with a superconducting coil on a rotor. The superconducting coil is in a racetrack shape and includes two straight segments and two curved segments, with each curved segment connected to the two straight segments at its two ends respectively. The annular stator structure includes a non-magnetic tooth section, a first magnetic section, a second magnetic section, a third magnetic section, and a plurality of windings. The length of the non-magnetic tooth section along the axial direction of the annular stator structure is equal to the length of the straight segment along the axial direction of the annular stator structure, and the non-magnetic tooth section and the straight segment are in the same axial position along the annular stator structure. The first magnetic section is located at at least one end of the non-magnetic tooth section along the axial direction of the annular stator structure, and the first magnetic section at least partially overlaps with the curved segment along the radial direction of the annular stator structure. The second magnetic section is located at the end of the first magnetic section away from the non-magnetic tooth section, and the second magnetic section at least partially overlaps with the curved segment along the radial direction of the annular stator structure. The third magnetic section is located at the end of the second magnetic section away from the first magnetic section, and the third magnetic section at least partially overlaps with the curved segment along the radial direction of the annular stator structure; the magnetic permeability of the second magnetic section is greater than that of the first magnetic section and less than that of the third magnetic section, and the saturation magnetization intensity of the second magnetic section is less than that of the first magnetic section and greater than that of the third magnetic section. Each winding is at least partially threaded along the axial direction of the annular stator structure and installed in the non-magnetic tooth section, the first magnetic section, the second magnetic section, and the third magnetic section.

[0008] Further, there are two first magnetic sections, two second magnetic sections, and two third magnetic sections. The two first magnetic sections are respectively located at the two ends of the non-magnetic tooth section along the axial direction of the annular stator structure. The two first magnetic sections and the non-magnetic tooth section are located between the two second magnetic sections. The two first magnetic sections, the non-magnetic tooth section, and the two second magnetic sections are located between the two third magnetic sections.

[0009] Further, the total length of one first magnetic section, one second magnetic section, and one third magnetic section along the axial direction of the annular stator structure is equal to the length of one curved segment along the axial direction of the annular stator structure.

[0010] Further, the first magnetic section is made of silicon steel sheets, the second magnetic section is made of amorphous materials, and the third magnetic section is made of ferrite materials.

[0011] Further, the annular stator structure includes an Nth magnetic section, where N is an integer greater than 3. The Nth magnetic section is farther from the non-magnetic tooth section than the (N - 1)th magnetic section. The magnetic permeability of the Nth magnetic section is less than that of the (N - 1)th magnetic section, and the saturation magnetization intensity of the Nth magnetic section is greater than that of the (N - 1)th magnetic section.

[0012] Further, the non-magnetic tooth section is an annular body. The annular stator structure includes a stator back iron, a magnetic ring, and a support ring that are annular bodies. The stator back iron is disposed around the magnetic ring and connected to the magnetic ring. The magnetic ring is disposed around the support ring and connected to the support ring. The support ring is disposed around the non-magnetic tooth section and connected to the non-magnetic tooth section. An installation groove is formed in the non-magnetic tooth section, and the notch of the installation groove is located on the side of the non-magnetic tooth section away from the support ring. A metal part is wrapped around the winding, and the magnetic ring adsorbs the metal part so that the winding is fixed in the installation groove. The stator back iron, the magnetic ring, the support ring, and the non-magnetic tooth section have the same length along the axial direction of the annular stator structure.

[0013] Further, the first magnetic section, the second magnetic section, and the third magnetic section are annular bodies. The inner diameters of the first magnetic section, the second magnetic section, and the third magnetic section are equal to the inner diameter of the non-magnetic tooth section, and the outer diameters of the first magnetic section, the second magnetic section, and the third magnetic section are equal to the outer diameter of the stator back iron. Corresponding fixing holes are formed in the first magnetic section, the second magnetic section, the third magnetic section, and the stator back iron. A fastener is passed through and connected to the fixing holes so that the first magnetic section, the second magnetic section, the third magnetic section, and the stator back iron are connected.

[0014] Further, the first magnetic section, the second magnetic section, the third magnetic section, and the non-magnetic tooth section are provided. A fixing groove is formed on the inner diameter surface of the stator back iron. Fixing protrusions are formed on the sides of the first magnetic section, the second magnetic section, the third magnetic section, and the non-magnetic tooth section close to the stator back iron. The fixing protrusions are located in the fixing groove and are snap-connected to the fixing groove. The total length of the first magnetic section, the second magnetic section, the third magnetic section, and the non-magnetic tooth section along the axial direction of the annular stator structure is a preset length, and the length of the stator back iron along the axial direction of the annular stator structure is equal to the preset length.

[0015] Further, the annular stator structure includes a stator back iron that is an annular body. Fixing protrusions are formed on the inner diameter surface of the stator back iron. Fixing grooves are formed on the sides of the first magnetic section, the second magnetic section, the third magnetic section, and the non-magnetic tooth section close to the stator back iron. The fixing protrusions are located in the fixing grooves and are snap-connected to the fixing grooves.

[0016] To achieve the above object, the present application adopts the following technical solutions:

[0017] A superconducting motor includes the above-mentioned annular stator structure.

[0018] Through the first magnetic section, the second magnetic section, and the third magnetic section, the above-mentioned annular stator structure and superconducting motor can utilize the magnetic field generated by the curved section of the superconducting coil, thereby improving the utilization rate of the curved section of the superconducting coil to increase the power of the superconducting motor, and reducing the magnetic leakage of the curved section to improve the operation stability of the superconducting motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the combination of the annular stator structure and the rotor provided by the embodiment of the present application.

[0020] Figure 2 Schematic diagram of the change in magnetic field strength provided by the embodiment of the present application.

[0021] Figure 3 Schematic diagram of the combination of the annular stator structure and the superconducting coil provided by the embodiment of the present application.

[0022] Figure 4 Another schematic diagram of the combination of the annular stator structure and the rotor provided by the embodiment of the present application. Detailed implementation manners

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the specific implementation manners of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the implementation manners of the present application.

[0024] It should be noted that the "first", "second" and similar terms used in the specification and claims of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the similar terms such as "a" or "one" do not indicate a quantity limitation, but indicate that there is at least one. "Multiple" or "several" means at least two. Unless otherwise indicated, the similar terms such as "front", "rear", "left", "right", "lower" and / or "upper" are only for convenience of description and are not limited to a position or a spatial orientation. The terms "including" or "comprising" and similar terms are intended to mean that the elements or objects appearing before "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0025] The singular forms of "a", "the" and "said" used in the specification and appended claims of the present application are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0026] Such as Figure 1As shown in the figure, the present application provides an annular stator structure 100, which is used to cooperate with the superconducting coil 200 on the rotor 300. The superconducting coil 200 can generate a strong magnetic field to improve the motor power. Among them, the superconducting coil 200 includes two straight segments 21 and two curved segments 22, and both ends of each curved segment 22 are respectively connected to the two straight segments 21, so that the superconducting coil 200 is in a racetrack shape.

[0027] Specifically, the annular stator structure 100 includes a non-magnetic tooth section 11, a first magnetic section 12, a second magnetic section 13, a third magnetic section 14 and a plurality of windings 15. Among them, when observing from the radial direction of the annular stator structure 100, the non-magnetic tooth section 11 is arranged around the straight segment 21 of the superconducting coil 200, so that the non-magnetic tooth section 11 can utilize the magnetic field generated by the straight segment 21 of the superconducting coil 200. The first magnetic section 12, the second magnetic section 13 and the third magnetic section 14 surround the curved segment 22 of the superconducting coil 200, so that the first magnetic section 12, the second magnetic section 13 and the third magnetic section 14 can utilize the magnetic field generated by the curved segment 22. Each winding 15 at least partially penetrates axially through the annular stator structure 100 and is installed in the non-magnetic tooth section 11, the first magnetic section 12, the second magnetic section 13 and the third magnetic section 14. The winding 15 is used to generate an induced magnetic field to cooperate with the magnetic field generated by the superconducting coil 200 to drive the motor to operate. With such an arrangement, the annular stator structure 100 can utilize the uniform magnetic field generated by the straight segment 21 through the non-magnetic tooth section 11, and the magnetic field generated by the curved segment 22 through the first magnetic section 12, the second magnetic section 13 and the third magnetic section 14, so as to improve the utilization rate of the superconducting coil 200 and improve the motor power.

[0028] Moreover, by utilizing the magnetic field generated by the curved segment 22 of the superconducting coil 200 by the first magnetic section 12, the second magnetic section 13 and the third magnetic section 14, the situation of magnetic leakage in the curved segment 22 can be avoided, so as to improve the utilization rate of the magnetic field energy generated by the superconducting coil 200, and the generation of eddy currents caused by magnetic leakage in the curved segment 22 can be avoided, thereby reducing the motor heating and improving the service life of the annular stator structure 100 and the superconducting coil 200.

[0029] Secondly, it can also avoid the magnetic field force generated by the magnetic leakage in the curved segment 22 from reducing the magnetic field uniformity in the annular stator structure 100, thereby avoiding the magnetic field non-uniform magnetic field force from exacerbating the vibration of the rotor 300, reducing the noise generated during the operation of the motor, and improving the operation stability of the motor.

[0030] In addition, it can also avoid the deformation of the winding 15 caused by the magnetic field force generated by the magnetic leakage in the curved segment 22, which is beneficial to improving the operation stability of the winding 15 and the service life of the motor.

[0031] In this embodiment, the length of the non-magnetic tooth portion segment 11 along the axial direction of the annular stator structure 100 is equal to the length of the straight segment 21 along the axial direction of the annular stator structure 100, and the positions of the non-magnetic tooth portion segment 11 and the straight segment 21 along the axial direction of the annular stator structure 100 are the same. With such a setting, when observing from the radial direction of the annular stator structure 100, the non-magnetic tooth portion segment 11 and the straight segment 21 are overlapped, so that the annular stator structure 100 can utilize the magnetic field generated by the straight segment 21. Secondly, it is possible to avoid the insufficient utilization rate of the straight segment 21 caused by the length of the non-magnetic tooth portion segment 11 along the axial direction of the annular stator structure 100 being shorter than the length of the straight segment 21 along the axial direction of the annular stator structure 100, which is beneficial to improving the motor power. In addition, it is also possible to avoid the waste of materials of the non-magnetic tooth portion segment 11 caused by the length of the non-magnetic tooth portion segment 11 along the axial direction of the annular stator structure 100 being greater than or equal to the length of the straight segment 21 along the axial direction of the annular stator structure 100, so as to reduce the production cost of the annular stator structure 100. Moreover, it is possible to avoid the non-magnetic tooth portion segment 11 interfering with the utilization of the curved segment 22 by the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14, so as to improve the utilization rate of the curved segment 22 by the annular stator structure 100.

[0032] Specifically, the first magnetic segment 12 is located at at least one end of the non-magnetic tooth portion segment 11 along the axial direction of the annular stator structure 100, and the first magnetic segment 12 and the curved segment 22 overlap at least partially along the radial direction of the annular stator structure 100. The second magnetic segment 13 is located at one end of the first magnetic segment 12 far from the non-magnetic tooth portion segment 11, and the second magnetic segment 13 and the curved segment 22 overlap at least partially along the radial direction of the annular stator structure 100. The third magnetic segment 14 is located at one end of the second magnetic segment 13 far from the first magnetic segment 12, and the third magnetic segment 14 and the curved segment 22 overlap at least partially along the radial direction of the annular stator structure 100. With such a setting, when observing from the radial direction of the annular stator structure 100, by overlapping the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14 with the curved segment 22, the annular stator structure 100 can utilize the magnetic field generated by the curved segment 22, thereby improving the utilization rate of the superconducting coil 200 and improving the motor power.

[0033] In this embodiment, the magnetic permeability of the second magnetic segment 13 is greater than that of the first magnetic segment 12 and less than that of the third magnetic segment 14. It should be noted that along the axial direction of the annular stator structure 100, the intensity of the magnetic field generated by the curved segment 22 of the superconducting coil 200 is stronger closer to the straight segment 21 and weaker farther away from the straight segment 21. Therefore, by increasing the magnetic permeability of the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 in sequence, the first magnetic segment 12 with a smaller magnetic permeability can be located in the region with a stronger magnetic field of the curved segment 22, and the third magnetic segment 14 with a larger magnetic permeability can be located in the region with a weaker magnetic field of the curved segment 22. The third magnetic segment 14 with a larger magnetic permeability can improve the guiding and concentrating effect on the magnetic field, thereby increasing the magnetic field intensity in the region with a weaker magnetic field of the curved segment 22 to improve the magnetic field uniformity at the curved segment 22. Therefore, in this application, the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 with different magnetic permeabilities can be selected according to the different magnetic field intensities generated by the curved segment 22, so as to increase the overall magnetic field intensity of the curved segment 22 to improve the magnetic field uniformity at the curved segment 22, and further increase the magnetic field power density generated by the cooperation of the curved segment 22 and the annular stator structure 100 to improve the power of the motor. And through the above settings, on the premise that the overall volume of the annular stator structure 100 increases due to the addition of the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 to utilize the magnetic field at the curved segment 22, by improving the power of the motor, the motor power density per unit volume of the annular stator structure 100 can be increased, thereby improving the motor performance.

[0034] In addition, in this embodiment, the saturation magnetization intensity of the second magnetic segment 13 is less than that of the first magnetic segment 12 and greater than that of the third magnetic segment 14. With such a setting, the first magnetic segment 12 with a larger saturation magnetization intensity can be located in the region with a stronger magnetic field of the curved segment 22, and the third magnetic segment 14 with a smaller saturation magnetization intensity can be located in the region with a weaker magnetic field of the curved segment 22, so as to avoid insufficient utilization of the magnetic field by the first magnetic segment 12 due to too small saturation magnetization intensity in the region with a stronger magnetic field, thereby improving the motor power. It can also avoid waste of materials due to too large saturation magnetization intensity of the third magnetic segment 14 in the region with a weaker magnetic field, so that the material utilization rate of the above magnetic segments can be improved, and the production cost of the annular stator structure 100 can be reduced.

[0035] As Figure 2 shown, as an embodiment, the magnitude of the magnetic field intensity generated by the superconducting coil 200 is measured. Among them, the abscissa is the length of the superconducting coil 200 along the axial direction of the annular stator structure 100, and the ordinate is the magnitude of the magnetic field intensity. It should be noted that Figure 2The blue line in the figure is the schematic line of the magnetic field intensity distribution of the superconducting coil 200 after using the three - segment end - tooth structure, that is, the annular stator structure 100 of the present application. Figure 2 The green line in the figure is the schematic line of the magnetic field intensity distribution of the superconducting coil 200 after using the traditional method, that is, the stator structure of the prior art. Figure 2 The red line in the figure is the schematic diagram of the magnetic field intensity distribution of the superconducting coil 200 after using the annular stator structure 100 with the stator back iron extended, that is, extending the non - magnetic tooth section 11. Figure 2 In the superconducting coil 200, the axial length from 0 mm to 150 mm is the straight - line section 21 area of the superconducting coil 200, and the axial length of the superconducting coil 200 greater than 150 mm is the curved - line section 22 area of the superconducting coil 200. According to Figure 2 It can be seen that the magnetic field intensity of the curved - line section 22 area of the superconducting coil 200 after using the annular stator structure 100 of the present application is greater than that of the superconducting coil 200 after using the annular stator structure 100 with the non - magnetic tooth section 11 extended. The magnetic field intensity of the superconducting coil 200 after using the annular stator structure 100 with the non - magnetic tooth section 11 extended is greater than that of the curved - line section 22 area of the superconducting coil 200 after using the stator structure of the prior art. The magnetic field uniformity of the curved - line section 22 area of the superconducting coil 200 after using the annular stator structure 100 of the present application is higher than the magnetic field intensity of the superconducting coil 200 after using the annular stator structure 100 with the non - magnetic tooth section 11 extended. The magnetic field intensity of the superconducting coil 200 after using the annular stator structure 100 with the non - magnetic tooth section 11 extended is higher than the magnetic field uniformity of the curved - line section 22 area of the superconducting coil 200 after using the stator structure of the prior art. Therefore, the annular stator structure 100 of the present application can not only utilize the magnetic field generated by the curved - line section 22 of the superconducting coil 200, but also improve the magnetic field intensity and magnetic field uniformity of the curved - line section 22, thereby improving the motor power.

[0036] It should be noted that the above - mentioned annular stator structure 100 with the non - magnetic tooth section 11 extended is another embodiment of the present application. When observing the annular stator structure 100 along the radial direction, the extended non - magnetic tooth section 11 can surround the straight - line section 21 and the curved - line section 22 of the superconducting coil 200, so that the non - magnetic tooth section 11 can utilize the magnetic fields generated by both the straight - line section 21 and the curved - line section 22 at the same time, thereby improving the utilization rate of the annular stator structure 100 for the superconducting coil 200, further improving the motor power, and avoiding magnetic flux leakage in the curved - line section 22 to improve the operation stability of the motor.

[0037] As an implementation manner, there are two first magnetic segments 12, two second magnetic segments 13, and two third magnetic segments 14. The two first magnetic segments 12 are respectively located at both ends of the non-magnetic tooth portion segment 11 along the axial direction of the annular stator structure 100. The two first magnetic segments 12 and the non-magnetic tooth portion segment 11 are located between the two second magnetic segments 13. The two first magnetic segments 12, the non-magnetic tooth portion segment 11, and the two second magnetic segments 13 are located between the two third magnetic segments 14. With such an arrangement, the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 can be symmetrically arranged at both ends of the non-magnetic tooth portion segment 11 along the axial direction of the annular stator structure 100, so that the annular stator structure 100 can utilize the two curved segments 22 of the superconducting coil 200, further improving the utilization rate of the superconducting coil 200.

[0038] As an implementation manner, the total length L1 of one first magnetic segment 12, one second magnetic segment 13, and one third magnetic segment 14 along the axial direction of the annular stator structure 100 is equal to the length L2 of one curved segment 22 along the axial direction of the annular stator structure 100. With such an arrangement, it is possible to avoid the situation where the total length L1 is less than the length L2 of one curved segment 22 along the axial direction of the annular stator structure 100, which may lead to insufficient utilization rate of the superconducting coil 200 by the annular stator structure 100 and magnetic leakage of the curved segment 22. This is beneficial to improving the utilization rate of the superconducting coil 200, increasing the motor power, and improving the running stability of the motor. In addition, it is also possible to avoid the situation where the total length L1 is greater than the length L2 of one curved segment 22 along the axial direction of the annular stator structure 100, which may result in waste of materials of the annular stator structure 100. At the same time, it is also possible to avoid the situation where the total length L1 is too large, resulting in an excessive volume of the annular stator structure 100, thereby avoiding a reduction in the motor power density per unit volume and further improving the motor performance.

[0039] As an alternative implementation, the first magnetic segment 12 is made of silicon steel sheets, the second magnetic segment 13 is made of amorphous material, and the third magnetic segment 14 is made of ferrite material. With such an arrangement, the silicon steel sheets have the characteristics of high saturation magnetization intensity and low magnetic permeability, so as to be adapted to the region with strong magnetic field of the curve segment 22 itself. Secondly, the silicon steel sheets have high structural strength, so that the first magnetic segment 12 can provide high supporting force for the annular stator structure 100 to improve the structural strength of the annular stator structure 100. The amorphous material has higher magnetic permeability and lower saturation magnetization intensity compared with the silicon steel sheets, so that the second magnetic segment 13 can be adapted to the region with weak magnetic field of the curve segment 22 itself, thereby improving the distribution uniformity of the magnetic flux density in this region and further improving the magnetic field intensity in this region. The ferrite material has higher magnetic permeability and lower saturation magnetization intensity compared with the amorphous material, so that the third magnetic segment 14 can be adapted to the region with weaker magnetic field of the curve segment 22 itself to further increase the magnetic field intensity in the region of the curve segment 22, thereby increasing the motor power, and can also avoid magnetic leakage in the curve segment 22 to improve the operation stability of the motor.

[0040] It should be noted that the present application does not limit the manufacturing materials of the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14, and only needs to meet the requirements of the magnetic permeability and saturation magnetization intensity between the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14.

[0041] As an implementation, the annular stator structure 100 includes an Nth magnetic segment, where N is an integer greater than 3. The Nth magnetic segment is farther away from the non-magnetic tooth segment 11 than the (N - 1)th magnetic segment. The magnetic permeability of the Nth magnetic segment is less than that of the (N - 1)th magnetic segment, and the saturation magnetization intensity of the Nth magnetic segment is greater than that of the (N - 1)th magnetic segment. With such an arrangement, by increasing the number of magnetic segments, the difference in magnetic permeability and saturation magnetization intensity between adjacent magnetic segments can be reduced, thereby improving the adaptability of the annular stator structure 100 to the magnetic field generated by the curve segment 22 and further improving the utilization rate of the magnetic field of the curve segment 22. In addition, by providing at least the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14 in the annular stator structure 100, it is possible to avoid too large a difference in magnetic permeability and saturation magnetization intensity between adjacent magnetic segments due to too few magnetic segments, thereby avoiding a too large difference resulting in a reduction in the utilization rate of the magnetic field generated by the curve segment 22 and further increasing the motor power.

[0042] It should be noted that the present application does not limit the number of magnetic segments, and the present application takes the example of providing the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14 for illustration.

[0043] Such as Figure 1 and Figure 3As shown, as an embodiment, the non-magnetic tooth section 11 is an annular body so that the non-magnetic tooth section 11 can surround the straight section 21 of the superconducting coil 200.

[0044] In this embodiment, the annular stator structure 100 includes a stator back iron 16 which is an annular body, a magnetic ring 17, and a support ring 18. The stator back iron 16 is the basic framework of the annular stator structure 100 and is used to support the magnetic ring 17, the support ring 18, and the first magnetic section 12, the second magnetic section 13, and the third magnetic section 14. The magnetic ring 17 is used to adsorb and fix the winding 15, and the support ring 18 cooperates with the stator back iron 16 to fix the magnetic ring 17.

[0045] Specifically, the stator back iron 16 is arranged around the magnetic ring 17 and connected to the magnetic ring 17. The magnetic ring 17 is arranged around the support ring 18 and connected to the support ring 18. The support ring 18 is arranged around the non-magnetic tooth section 11 and connected to the non-magnetic tooth section 11. Exemplarily, the stator back iron 16 and the magnetic ring 17 are bonded by fixing glue, the magnetic ring 17 and the support ring 18 are bonded by fixing glue, and the support ring 18 and the non-magnetic tooth section 11 are bonded by fixing glue.

[0046] More specifically, the non-magnetic tooth section 11 is provided with an installation groove 111, and the notch of the installation groove 111 is located on the side of the non-magnetic tooth section 11 away from the support ring 18. With such a setting, it is beneficial for the winding 15 to be installed in the non-magnetic tooth section 11 through the installation groove 111. More specifically, a metal part 151 is wrapped on the winding 15, and the magnetic ring 17 adsorbs the metal part 151 so that the winding 15 is fixed in the installation groove 111. With such a setting, the installation structure of the winding 15 in the annular stator structure 100 can be simplified, and the assembly efficiency of the winding 15 can be improved.

[0047] In this embodiment, the stator back iron 16, the magnetic ring 17, the support ring 18, and the non-magnetic tooth section 11 have the same length along the axial direction of the annular stator structure 100. With such a setting, it is possible to avoid waste of materials caused by the stator back iron 16, the magnetic ring 17, and the support ring 18 being too long, so as to reduce the production cost of the annular stator structure 100. In addition, it is also possible to avoid insufficient support force for the non-magnetic tooth section 11 and insufficient adsorption force for the winding 15 caused by the stator back iron 16, the magnetic ring 17, and the support ring 18 being too short, thereby improving the structural stability of the annular stator structure 100.

[0048] As an alternative implementation, the first magnetic section 12, the second magnetic section 13, and the third magnetic section 14 are annular bodies. With such a setting, it is possible to make the first magnetic section 12, the second magnetic section 13, and the third magnetic section 14 surround the curved section 22.

[0049] Specifically, the inner diameters of the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 are equal to the inner diameter of the non-magnetic tooth segment 11, and the outer diameters of the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 are equal to the outer diameter of the stator back iron 16. With such a setting, the annular stator structure 100 can be substantially in a cylindrical structure, so as to improve the convenience of use of the annular stator structure 100.

[0050] In this embodiment, fixing holes 161 are provided on the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14, and the stator back iron 16 in one-to-one correspondence. A fastener 162 is passed through the fixing holes 161 and connected to the fixing holes 161, so as to connect the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14, and the stator back iron 16. Exemplarily, the fastener 162 can be a rivet. By using the rivet to fixedly connect the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14, and the stator back iron 16, it is beneficial to simplify the assembly process between the above-mentioned components and improve the assembly efficiency of the annular stator structure 100.

[0051] As Figure 4 shown, as another embodiment, the stator back iron 16 surrounds the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14, and the non-magnetic tooth segment 11. Specifically, a fixing groove (not shown in the figure) is provided on the inner diameter surface of the stator back iron 16. Fixing protrusions (not shown in the figure) are formed on one side of the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14, and the non-magnetic tooth segment 11 close to the stator back iron 16. The fixing protrusions are located in the fixing groove and are clamped with the fixing groove. Exemplarily, the fixing groove can be a dovetail groove, and the fixing protrusion can be a dovetail protrusion. By the clamping of the dovetail groove and the dovetail protrusion, the connection stability between the stator back iron 16 and the above-mentioned magnetic segments can be improved.

[0052] In this embodiment, the total length L3 of the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14, and the non-magnetic tooth segment 11 in the axial direction of the annular stator structure 100 is a preset length, and the length L4 of the stator back iron 16 in the axial direction of the annular stator structure 100 is equal to the preset length. With such a setting, the utilization rate of the curve segment 22 can be improved through the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14, and the increase in the length of the stator back iron 16 in the axial direction of the annular stator structure 100 can be avoided. Without increasing the volume of the annular stator structure 100, the overall power density of the motor can be improved, and the magnetic leakage of the curve segment 22 can be reduced, thereby improving the operation stability of the motor.

[0053] As another implementation manner, fixing protrusions (not shown in the figures) are formed on the inner diameter surface of the stator back iron 16, and fixing grooves (not shown in the figures) are formed on one side of the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14 and the non-magnetic tooth segment 11 close to the stator back iron 16. The fixing protrusions are located in the fixing grooves and are snap-connected with the fixing grooves. Therefore, the present application does not limit the setting forms of the fixing protrusions and the fixing grooves on the stator back iron 16 or the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14, and only needs to satisfy that the stator back iron 16 can be connected with the above magnetic segments.

[0054] It should be noted that the stator back iron 16 can also be bonded to the above magnetic segments by fixing glue. Therefore, the present application does not limit the connection manner between the stator back iron 16 and the above magnetic segments.

[0055] As an implementation manner, the present application also provides a superconducting motor (not shown in the figures). The superconducting motor includes the above annular stator structure 100, and the superconducting motor further includes a rotor 300, and a racetrack-shaped superconducting coil 200 is arranged inside the rotor 300. The utilization rate of the superconducting coil 200 by the annular stator structure 100 can be improved, thereby improving the power of the superconducting motor and the power density per unit volume of the superconducting motor. In addition, the magnetic leakage of the curved segment 22 of the superconducting coil 200 can also be reduced, thereby improving the operation stability and service life of the superconducting motor.

[0056] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present application.

Claims

1. A ring-shaped stator structure, used for cooperating with a superconducting coil on a rotor, wherein the superconducting coil is in a racetrack shape and comprises two straight segments and two curved segments, and the two ends of each curved segment are respectively connected to the two straight segments, characterized in that: The annular stator structure comprises: a non-magnetic tooth segment, wherein the length of the non-magnetic tooth segment along the axial direction of the annular stator structure is equal to the length of the straight line segment along the axial direction of the annular stator structure, and the non-magnetic tooth segment and the straight line segment are located at the same position along the axial direction of the annular stator structure; a first magnetic segment, the first magnetic segment being located at at least one end of the non-magnetic tooth segment along the axial direction of the annular stator structure, and the first magnetic segment at least partially overlaps with the curved segment along the radial direction of the annular stator structure; a second magnetic segment, the second magnetic segment being located at an end of the first magnetic segment away from the non-magnetic tooth segment, the second magnetic segment at least partially overlapping the curved segment in the radial direction of the annular stator structure; a third magnetic segment, the third magnetic segment being located at an end of the second magnetic segment away from the first magnetic segment, the third magnetic segment at least partially overlapping with the curved segment in the radial direction of the annular stator structure; the magnetic permeability of the second magnetic segment being greater than the magnetic permeability of the first magnetic segment and less than the magnetic permeability of the third magnetic segment, the saturation magnetization intensity of the second magnetic segment being less than the saturation magnetization intensity of the first magnetic segment and greater than the saturation magnetization intensity of the third magnetic segment; and A plurality of windings, each of which is at least partially axially arranged along the annular stator structure and installed in the non-magnetic tooth segment, the first magnetic segment, the second magnetic segment and the third magnetic segment.

2. The annular stator structure according to claim 1, characterized in that: There are two of each of the first magnetic segment, the second magnetic segment and the third magnetic segment. The two first magnetic segments are respectively located at the two ends of the non-magnetic tooth segment along the axial direction of the annular stator structure, the two first magnetic segments and the non-magnetic tooth segment are located between the two second magnetic segments, and the two first magnetic segments, the non-magnetic tooth segment and the two second magnetic segments are located between the two third magnetic segments.

3. The annular stator structure according to claim 1 or 2, characterized in that: The total length of one of the first magnetic segment, one of the second magnetic segment, and one of the third magnetic segment along the axial direction of the annular stator structure is equal to the length of one of the curved segments along the axial direction of the annular stator structure.

4. The annular stator structure according to claim 3, characterized in that: The first magnetic segment is made of silicon steel sheet, the second magnetic segment is made of amorphous material, and the third magnetic segment is made of ferrite material.

5. The annular stator structure according to claim 1 or 2, characterized in that: The annular stator structure includes an Nth magnetic segment, N is an integer greater than 3, wherein the Nth magnetic segment is farther away from the non-magnetic tooth segment than the N-1th magnetic segment, the magnetic permeability of the Nth magnetic segment is smaller than the magnetic permeability of the N-1th magnetic segment, and the saturation magnetization intensity of the Nth magnetic segment is greater than the saturation magnetization intensity of the N-1th magnetic segment.

6. The annular stator structure according to claim 1 or 2, characterized in that: The non-magnetic tooth segment is an annular body, and the annular stator structure includes a stator back iron, a magnetic ring and a support ring which are annular bodies, the stator back iron is arranged around the magnetic ring and connected to the magnetic ring, the magnetic ring is arranged around the support ring and connected to the support ring, and the support ring is arranged around the non-magnetic tooth segment and connected to the non-magnetic tooth segment; The non-magnetic tooth section is provided with a mounting groove, the notch of the mounting groove is located on a side of the non-magnetic tooth section away from the support ring, the winding is wrapped with a metal piece, and the magnetic ring absorbs the metal piece so that the winding is fixed in the mounting groove; The stator back iron, the magnetic ring, the support ring and the non-magnetic tooth segment have the same length in the axial direction of the annular stator structure.

7. The annular stator structure according to claim 6, characterized in that: The first magnetic segment, the second magnetic segment, and the third magnetic segment are annular bodies, the inner diameters of the first magnetic segment, the second magnetic segment, and the third magnetic segment are equal to the inner diameter of the non-magnetic tooth segment, the outer diameters of the first magnetic segment, the second magnetic segment, and the third magnetic segment are equal to the outer diameter of the stator back iron, and the first magnetic segment, the second magnetic segment, the third magnetic segment, and the stator back iron are provided with corresponding fixing holes, and a fastener is passed through the fixing hole and connected to the fixing hole, so that the first magnetic segment, the second magnetic segment, the third magnetic segment, and the stator back iron are connected.

8. The annular stator structure according to claim 1 or 2, characterized in that: The annular stator structure includes a stator back iron in the form of an annular body, wherein the stator back iron is arranged around the first magnetic segment, the second magnetic segment, the third magnetic segment and the non-magnetic tooth segment; A fixing groove is formed on the inner diameter surface of the stator back iron, and a fixing protrusion is formed on the first magnetic segment, the second magnetic segment, the third magnetic segment and the side of the non-magnetic tooth segment close to the stator back iron, and the fixing protrusion is located in the fixing groove and is clamped with the fixing groove; The total length of the first magnetic segment, the second magnetic segment, the third magnetic segment and the non-magnetic tooth segment along the axial direction of the annular stator structure is a preset length, and the length of the stator back iron along the axial direction of the annular stator structure is equal to the preset length.

9. The annular stator structure according to claim 1 or 2, characterized in that: The annular stator structure includes a stator back iron which is an annular body, a fixing protrusion is formed on the inner diameter surface of the stator back iron, and the first magnetic segment, the second magnetic segment, the third magnetic segment and the non-magnetic tooth segment are all provided with fixing grooves on one side close to the stator back iron, and the fixing protrusion is located in the fixing groove and is clamped with the fixing groove.

10. A superconducting motor, characterized in that: The superconducting motor comprises the annular stator structure according to any one of claims 1 to 9.

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