Annular stator structure and superconducting motor thereof

Abstract

The invention discloses an annular stator structure and a superconducting motor thereof, the annular stator structure is used for cooperating with a superconducting coil on a rotor, the superconducting coil is in a runway shape and comprises two linear segments and two curved segments, the annular stator structure comprises 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 section is larger than that of the first magnetic section and smaller than that of the third magnetic section, the saturation magnetization of the second magnetic section is smaller than that of the first magnetic section and larger than that of the third magnetic section, and the superconducting motor comprises an annular stator structure. Through the arrangement, the utilization rate of the curve section of the superconducting coil can be improved, so that the power of the superconducting motor is improved, the magnetic leakage of the curve section can be reduced, and the operation stability of the superconducting motor is improved.

Description

Technical Field

[0001] The present 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 is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. A superconducting motor is a motor whose field winding is made of superconducting materials and is wound with wires that can carry high-density currents in a strong magnetic field.

[0003] Superconducting coils are usually arranged in the rotor of a superconducting motor to increase the induced magnetic field in the motor to increase the power of the superconducting motor. Superconducting coils in the prior art are usually runway-shaped, that is, superconducting coils usually include straight segments extending along a straight line and curved segments extending along a circular arc. The stator structure in the prior art usually only uses the straight segments with larger magnetic field strength, and does not use the curved segments of the superconducting coils to generate magnetic fields, resulting in a waste of superconducting coils. Secondly, the magnetic field generated by the unused curved segments of the superconducting coils will cause magnetic leakage in the superconducting coils, and the magnetic field force formed by the leakage will not only aggravate the vibration of the rotor, but also cause the stator windings to bend, increase the risk of motor operation, and reduce the service life of the motor.

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

[0005] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide a ring-shaped stator structure and a superconducting motor thereof with high utilization rate of superconducting coil curved sections.

[0006] To achieve the above objectives, this application adopts the following technical solutions: A ring-shaped stator structure is used to cooperate with a superconducting coil on a rotor. The superconducting coil is in a runway shape and includes two straight segments and two curved segments. The two ends of each curved segment are respectively connected to the two straight segments. The ring-shaped stator structure includes a non-magnetic tooth segment, a first magnetic segment, a second magnetic segment, a third magnetic segment and a plurality of windings. The length of the non-magnetic tooth segment along the axial direction of the ring-shaped stator structure is equal to the length of the straight segment along the axial direction of the ring-shaped stator structure, and the positions of the non-magnetic tooth segment and the straight segment along the axial direction of the ring-shaped stator structure are consistent. The first magnetic segment is located at at least one end of the non-magnetic tooth segment along the axial direction of the ring-shaped stator structure, and the first magnetic segment and the curved segment at least partially overlap in the radial direction of the ring-shaped stator structure. The second magnetic segment is located at one end of the first magnetic segment away from the non-magnetic tooth segment, and the second magnetic segment and the curved segment at least partially overlap in the radial direction of the ring-shaped stator structure. The third magnetic segment is located at an end of the second magnetic segment away from the first magnetic segment, and the third magnetic segment and the curved segment at least partially overlap in the radial direction of the annular stator structure; the magnetic permeability of the second magnetic segment is greater than the magnetic permeability of the first magnetic segment and less than the magnetic permeability of the third magnetic segment, and the saturation magnetization intensity of the second magnetic segment is less than the saturation magnetization intensity of the first magnetic segment and greater than the saturation magnetization intensity of the third magnetic segment. Each winding 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.

[0007] Furthermore, there are two first magnetic segments, two second magnetic segments and two third magnetic segments, 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.

[0008] Furthermore, the total length of a first magnetic segment, a second magnetic segment, and a third magnetic segment along the axial direction of the annular stator structure is equal to the length of a curved segment along the axial direction of the annular stator structure.

[0009] Furthermore, 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.

[0010] Furthermore, 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.

[0011] Furthermore, 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 an annular body. 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 segment is provided with a mounting groove, and the notch of the mounting groove is located on the side of the non-magnetic tooth segment away from the support ring. The winding is wrapped with a metal part, and the magnetic part absorbs the metal part 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 along the axial direction of the annular stator structure.

[0012] Furthermore, 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.

[0013] Furthermore, a first magnetic segment, a second magnetic segment, a third magnetic segment and a non-magnetic tooth segment are provided. A fixing groove is provided on the inner diameter surface of the stator back iron, and a fixing protrusion is formed on the side of the first magnetic segment, the second magnetic segment, the third magnetic segment and 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.

[0014] Furthermore, 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 the side close to the stator back iron, and the fixing protrusions are located in the fixing grooves and are clamped in the fixing grooves.

[0015] To achieve the above objectives, this application adopts the following technical solutions: A superconducting motor comprises the annular stator structure.

[0016] The above-mentioned annular stator structure and its superconducting motor can utilize the magnetic field generated by the curved section of the superconducting coil through the first magnetic section, the second magnetic section and the third magnetic section, thereby improving the utilization rate of the curved section of the superconducting coil to improve the power of the superconducting motor, and can reduce the leakage magnetic field of the curved section to improve the operating stability of the superconducting motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic diagram of the combination of an annular stator structure and a rotor provided in an embodiment of the present application.

[0018] Figure 2 A schematic diagram of the change in magnetic field strength provided in an embodiment of the present application.

[0019] Figure 3 A schematic diagram of the combination of an annular stator structure and a superconducting coil provided in an embodiment of the present application.

[0020] Figure 4 A schematic diagram of another combination of an annular stator structure and a rotor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation manner of the present application will be clearly and completely described below in conjunction with the drawings in the implementation manner of the present application.

[0022] It should be noted that the words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantitative limitation, but indicate the existence of at least one. "Multiple" or "several" means at least two. Unless otherwise specified, words such as "front", "back", "left", "right", "bottom" and / or "top" are only for the convenience of description and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0023] The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0024] like Figure 1As shown, the present application provides an annular stator structure 100, which is used to cooperate with a superconducting coil 200 on a rotor 300. The superconducting coil 200 can generate a strong magnetic field to improve the motor power. The superconducting coil 200 includes two straight segments 21 and two curved segments 22, and the two ends of each curved segment 22 are respectively connected to the two straight segments 21, so that the superconducting coil 200 is in a runway shape.

[0025] Specifically, the annular stator structure 100 includes a non-magnetic tooth segment 11, a first magnetic segment 12, a second magnetic segment 13, a third magnetic segment 14, and a plurality of windings 15. When viewed from the radial direction of the annular stator structure 100, the non-magnetic tooth segment 11 is arranged around the straight segment 21 of the superconducting coil 200, so that the non-magnetic tooth segment 11 can utilize the magnetic field generated by the straight segment 21 of the superconducting coil 200. The first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 surround the curved segment 22 of the superconducting coil 200, so that the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14 can utilize the curved segment 22 to generate a magnetic field. Each winding 15 is at least partially axially arranged in the annular stator structure 100 and installed in the non-magnetic tooth segment 11, the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 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. Such an arrangement enables the annular stator structure 100 to utilize the uniform magnetic field generated by the straight line segment 21 through the non-magnetic tooth segment 11, and to utilize the magnetic field generated by the curved segment 22 through the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14, thereby improving the utilization rate of the superconducting coil 200 and thus improving the motor power.

[0026] Furthermore, by utilizing the magnetic field generated by the curved segment 22 of the superconducting coil 200 through the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14, magnetic leakage of the curved segment 22 can be avoided, thereby improving the utilization rate of the magnetic field energy generated by the superconducting coil 200 and avoiding the generation of eddy currents due to magnetic leakage of the curved segment 22, thereby reducing the heating of the motor and improving the service life of the annular stator structure 100 and the superconducting coil 200.

[0027] Secondly, it can also avoid the magnetic field force generated by the leakage of the curved segment 22, which will reduce the uniformity of the magnetic field in the annular stator structure 100, thereby avoiding the inhomogeneous magnetic field force that will aggravate the vibration of the rotor 300, thereby reducing the noise generated during the operation of the motor and improving the operating stability of the motor.

[0028] In addition, it is also possible to avoid the magnetic field force generated by the magnetic leakage of the curved section 22, which causes the winding 15 to deform under the action of the magnetic field force, thereby facilitating the improvement of the running stability of the winding 15 and the service life of the motor.

[0029] In this embodiment, the length of the non-magnetic tooth 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 non-magnetic tooth segment 11 and the straight segment 21 are arranged at the same position along the axial direction of the annular stator structure 100. In this way, when viewed from the radial direction of the annular stator structure 100, the non-magnetic tooth segment 11 and the straight segment 21 are arranged overlappingly, so that the annular stator structure 100 can utilize the magnetic field generated by the straight segment 21. Secondly, it can avoid that the length of the non-magnetic tooth segment 11 along the axial direction of the annular stator structure 100 is shorter than the length of the straight segment 21 along the axial direction of the annular stator structure 100, resulting in insufficient utilization of the straight segment 21, which is conducive to improving the motor power. In addition, it is also possible to avoid the waste of material of the non-magnetic tooth segment 11 caused by the length of the non-magnetic tooth segment 11 along the axial direction of the annular stator structure 100 being greater than or equal to the axial length of the straight line 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, and it is also possible to avoid the non-magnetic tooth 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.

[0030] Specifically, the first magnetic segment 12 is located at least at one end of the non-magnetic tooth segment 11 along the axial direction of the annular stator structure 100, and the first magnetic segment 12 and the curved segment 22 at least partially overlap in 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 away from the non-magnetic tooth segment 11, and the second magnetic segment 13 and the curved segment 22 at least partially overlap in 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 away from the first magnetic segment 12, and the third magnetic segment 14 and the curved segment 22 at least partially overlap in the radial direction of the annular stator structure 100. In this way, when viewed from the radial direction of the annular stator structure 100, the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14 overlap with the curved segment 22, so that 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.

[0031] In this embodiment, the magnetic permeability of the second magnetic segment 13 is greater than the magnetic permeability of the first magnetic segment 12 and less than the magnetic permeability of the third magnetic segment 14. It should be noted that, along the axial direction of the annular stator structure 100, the magnetic field intensity generated by the curved segment 22 of the superconducting coil 200 is stronger the closer to the straight segment 21, and the magnetic field intensity is weaker the farther away from the straight segment 21. Therefore, by increasing the magnetic permeabilities 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 area where the magnetic field of the curved segment 22 is stronger, and the third magnetic segment 14 with a larger magnetic permeability can be located in the area where the magnetic field of the curved segment 22 is weaker. The third magnetic segment 14 with a larger magnetic permeability can improve the guiding and concentrating effect of the magnetic field, thereby improving the magnetic field intensity in the area where the magnetic field of the curved segment 22 is weaker, so as to improve the uniformity of the magnetic field at the curved segment 22. Therefore, the present application can select the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14 with different magnetic permeabilities according to the different magnetic field strengths generated by the curved segment 22, so as to improve the overall magnetic field strength of the curved segment 22 to improve the uniformity of the magnetic field at the curved segment 22, and then improve the power density of the magnetic field generated by the curved segment 22 and the annular stator structure 100, so as to improve the power of the motor. And through the above-mentioned settings, under the premise that the overall volume of the annular stator structure 100 is increased by increasing 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, the power of the motor can be increased by increasing the power density of the motor per unit volume of the annular stator structure 100, thereby improving the motor performance.

[0032] In addition, in this embodiment, the saturation magnetization intensity of the second magnetic segment 13 is smaller than the saturation magnetization intensity of the first magnetic segment 12 and larger than the saturation magnetization intensity of the third magnetic segment 14. With such a configuration, the first magnetic segment 12 with a larger saturation magnetization intensity can be located in the area of ​​the curved segment 22 where the magnetic field is stronger, and the third magnetic segment 14 with a smaller saturation magnetization intensity can be located in the area of ​​the curved segment 22 where the magnetic field is weaker, thereby avoiding the first magnetic segment 12 in the area with a stronger magnetic field from having a saturation magnetization intensity that is too small, resulting in insufficient utilization of the magnetic field by the first magnetic segment 12, so as to improve the motor power. It is also possible to avoid the third magnetic segment 14 in the area with a weaker magnetic field from having a saturation magnetization intensity that is too large, resulting in material waste, thereby improving the material utilization of the above-mentioned magnetic segments and reducing the production cost of the annular stator structure 100.

[0033] like Figure 2 As shown in FIG. 1 , as an implementation method, the magnetic field strength generated by the superconducting coil 200 is measured. The horizontal axis is the length of the superconducting coil 200 along the axial direction of the annular stator structure 100, and the vertical axis is the magnetic field strength. It should be noted that Figure 2The middle blue line is a schematic line of the magnetic field intensity distribution of the superconducting coil 200 after using the three-section end tooth structure, that is, the annular stator structure 100 of the present application. Figure 2 The green line in the middle is a schematic line showing the magnetic field intensity distribution of the superconducting coil 200 after using the conventional method, i.e., the stator structure of the prior art. Figure 2 The red line in the middle is a schematic diagram of the magnetic field intensity distribution of the superconducting coil 200 after the annular stator structure 100 is extended by using the stator back iron, that is, the non-magnetic tooth section 11 is extended. Figure 2 The axial length of the superconducting coil 200 is from 0 mm to 150 mm, which is the straight section 21 of the superconducting coil 200. The axial length of the superconducting coil 200 is greater than 150 mm, which is the curved section 22 of the superconducting coil 200. Figure 2 It can be seen that the magnetic field intensity of the curved 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 extended non-magnetic tooth section 11, and the magnetic field intensity of the superconducting coil 200 after using the annular stator structure 100 with the extended non-magnetic tooth section 11 is greater than that of the superconducting coil 200 after using the stator structure of the prior art. The magnetic field uniformity of the curved section 22 area of ​​the superconducting coil 200 after using the annular stator structure 100 of the present application is higher than that of the superconducting coil 200 after using the annular stator structure 100 with the extended non-magnetic tooth section 11, and the magnetic field intensity of the superconducting coil 200 after using the annular stator structure 100 with the extended non-magnetic tooth section 11 is higher than that 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 segment 22 of the superconducting coil 200, but also improve the magnetic field strength and magnetic field uniformity of the curved segment 22, thereby improving the motor power.

[0034] It should be noted that the annular stator structure 100 with the extended non-magnetic tooth segment 11 is another embodiment of the present application. When viewed along the radial direction of the annular stator structure 100, the extended non-magnetic tooth segment 11 can surround the straight segment 21 and the curved segment 22 of the superconducting coil 200, so that the non-magnetic tooth segment 11 can simultaneously utilize the magnetic field generated by the straight segment 21 and the curved segment 22, thereby improving the utilization rate of the annular stator structure 100 for the superconducting coil 200, thereby improving the motor power, and avoiding magnetic leakage of the curved segment 22, so as to improve the running stability of the motor.

[0035] As an embodiment, 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 two ends of the non-magnetic tooth segment 11 along the axial direction of the annular stator structure 100, the two first magnetic segments 12 and the non-magnetic tooth segment 11 are located between the two second magnetic segments 13, and the two first magnetic segments 12, the non-magnetic tooth segment 11 and the two second magnetic segments 13 are located between the two third magnetic segments 14. In this way, the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14 can be symmetrically arranged at two ends of the non-magnetic tooth segment 11 along the axial direction of the annular stator structure 100, so that the annular stator structure 100 can use the two curved segments 22 of the superconducting coil 200, further improving the utilization rate of the superconducting coil 200.

[0036] As an implementation mode, the total length L1 of a first magnetic segment 12, a second magnetic segment 13, and a third magnetic segment 14 along the axial direction of the annular stator structure 100 is equal to the length L2 of a curved segment 22 along the axial direction of the annular stator structure 100. With such a configuration, it is possible to avoid the total length L1 being less than the length L2 of a curved segment 22 along the axial direction of the annular stator structure 100. This results in insufficient utilization of the superconducting coil 200 by the annular stator structure 100, and avoids magnetic leakage of the curved segment 22, which is beneficial to improving the utilization of the superconducting coil 200 and the motor power, as well as improving the running stability of the motor. In addition, it is also possible to avoid the total length L1 being greater than the length L2 of a curved segment 22 along the axial direction of the annular stator structure 100. This results in material waste of the annular stator structure 100, and it is also possible to avoid the total length L1 being too large, which results in an excessively large volume of the annular stator structure 100, thereby avoiding a reduction in the motor power density per unit volume, and thus improving the motor performance.

[0037] As an optional implementation, the first magnetic segment 12 is made of silicon steel sheets, the second magnetic segment 13 is made of amorphous materials, and the third magnetic segment 14 is made of ferrite materials. With this arrangement, the silicon steel sheets have the characteristics of higher saturation magnetization and lower magnetic permeability, so that they can adapt to the area of ​​the strong magnetic field of the curved segment 22 itself. Secondly, the higher structural strength of the silicon steel sheets enables the first magnetic segment 12 to provide a higher supporting force for the annular stator structure 100, so as to improve the structural strength of the annular stator structure 100. Compared with silicon steel sheets, amorphous materials have higher magnetic permeability and lower saturation magnetization, so that the second magnetic segment 13 can adapt to the area of ​​the curved segment 22 itself where the magnetic field is weaker, thereby improving the uniformity of the distribution of the magnetic flux density in the area, and then improving the magnetic field strength in the area. Ferrite material has higher magnetic permeability and lower saturation magnetization intensity than amorphous material, so that the third magnetic segment 14 can adapt to the area where the magnetic field of the curved segment 22 itself is weaker, so as to further increase the strength of the magnetic field in the curved segment 22 area, thereby increasing the motor power, and also avoiding magnetic leakage of the curved segment 22 to improve the operating stability of the motor.

[0038] It should be noted that the present application does not restrict 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 magnetic permeability requirements and saturation magnetization intensity requirements between the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14.

[0039] As an embodiment, the annular stator structure 100 includes an Nth magnetic segment, N is an integer greater than 3, wherein the Nth magnetic segment is further away from the non-magnetic tooth segment 11 than the N-1th magnetic segment, the magnetic permeability of the Nth magnetic segment is less than the magnetic permeability of the N-1th magnetic segment, and the saturation magnetization of the Nth magnetic segment is greater than the saturation magnetization of the N-1th magnetic segment. In this way, by increasing the number of magnetic segments, the difference in magnetic permeability and saturation magnetization between adjacent magnetic segments can be reduced, thereby improving the adaptability of the annular stator structure 100 to the magnetic field generated by the curved segment 22, and further improving the utilization rate of the magnetic field of the curved segment 22. In addition, by providing the annular stator structure 100 with at least the first magnetic segment 12, the second magnetic segment 13 and the third magnetic segment 14, it is possible to avoid too few magnetic segments resulting in too large a difference in magnetic permeability and saturation magnetization between adjacent magnetic segments, thereby avoiding too large a difference resulting in a reduction in the utilization rate of the magnetic field generated by the curved segment 22, thereby improving the motor power.

[0040] It should be noted that the present application does not limit the number of magnetic segments, and the present application is described by taking the first magnetic segment 12 , the second magnetic segment 13 and the third magnetic segment 14 as an example.

[0041] like Figure 1 and Figure 3As shown, as an embodiment, the non-magnetic tooth segment 11 is a ring-shaped body, so that the non-magnetic tooth segment 11 can surround the straight segment 21 of the superconducting coil 200 .

[0042] In this embodiment, the annular stator structure 100 includes an annular stator back iron 16, a magnetic ring 17, and a support ring 18. The stator back iron 16 is the basic frame of the annular stator structure 100, and is used to support the magnetic ring 17, the support ring 18, and the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14. The magnetic ring 17 is used to absorb and fix the winding 15, and the support ring 18 cooperates with the stator back iron 16 to fix the magnetic ring 17.

[0043] Specifically, the stator back iron 16 is disposed around the magnetic ring 17 and connected to the magnetic ring 17, the magnetic ring 17 is disposed around the support ring 18 and connected to the support ring 18, and the support ring 18 is disposed around the non-magnetic tooth segment 11 and connected to the non-magnetic tooth segment 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 segment 11 are bonded by fixing glue.

[0044] More specifically, the non-magnetic tooth segment 11 is provided with a mounting groove 111, and the notch of the mounting groove 111 is located on the side of the non-magnetic tooth segment 11 away from the support ring 18. Such a configuration is conducive to the installation of the winding 15 in the non-magnetic tooth segment 11 through the mounting groove 111. More specifically, the winding 15 is wrapped with a metal part 151, and the magnetic part absorbs the metal part 151, so that the winding 15 is fixed in the mounting groove 111. Such a configuration can simplify the installation structure of the winding 15 in the annular stator structure 100, and improve the assembly efficiency of the winding 15.

[0045] In this embodiment, the stator back iron 16, the magnetic ring 17, the support ring 18 and the non-magnetic tooth segment 11 have the same length in the axial direction of the annular stator structure 100. Such an arrangement can avoid the stator back iron 16, the magnetic ring 17 and the support ring 18 being too long and causing material waste, thereby reducing the production cost of the annular stator structure 100. In addition, it can also avoid the stator back iron 16, the magnetic ring 17 and the support ring 18 being too short and causing insufficient support force for the non-magnetic tooth segment 11 and insufficient adsorption force for the winding 15, thereby improving the structural stability of the annular stator structure 100.

[0046] As an optional implementation, the first magnetic segment 12 , the second magnetic segment 13 , and the third magnetic segment 14 are annular bodies. In this way, the first magnetic segment 12 , the second magnetic segment 13 , and the third magnetic segment 14 can be arranged around the curved segment 22 .

[0047] 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 an arrangement, the annular stator structure 100 can be substantially cylindrical, so as to improve the convenience of use of the annular stator structure 100.

[0048] In this embodiment, the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14 and the stator back iron 16 are provided with corresponding fixing holes 161, and a fastener 162 is passed through the fixing hole 161 and connected to the fixing hole 161, so that the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14 and the stator back iron 16 are connected. Exemplarily, the fastener 162 can be a rivet, and the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14 and the stator back iron 16 are fixedly connected by the rivet, which is conducive to simplifying the assembly process between the above-mentioned parts and improving the assembly efficiency of the annular stator structure 100.

[0049] like Figure 4 As shown, as another embodiment, the stator back iron 16 is arranged around 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) is provided on the inner diameter surface of the stator back iron 16, and a fixing protrusion (not shown) is formed on the 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, and the fixing protrusion is located in the fixing groove and is clamped with the fixing groove. Exemplarily, the fixing groove can be a dovetail groove, and the fixing protrusion can be a dovetail protrusion. The connection stability between the stator back iron 16 and the above-mentioned magnetic segment can be improved by clamping the dovetail groove and the dovetail protrusion.

[0050] 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 along the axial direction of the annular stator structure 100 is a preset length, and the length L4 of the stator back iron 16 along the axial direction of the annular stator structure 100 is equal to the preset length. In this way, the utilization rate of the curved segment 22 can be improved by the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14, and the increase in the axial length of the stator back iron 16 along the annular stator structure 100 can be avoided, so that the overall power density of the motor is improved without increasing the volume of the annular stator structure 100, and the leakage of the curved segment 22 can be reduced, thereby improving the running stability of the motor.

[0051] As another embodiment, a fixing protrusion (not shown) is formed on the inner diameter surface of the stator back iron 16, and a fixing groove (not shown) is provided on the first magnetic segment 12, the second magnetic segment 13, the third magnetic segment 14, and the non-magnetic tooth segment 11 on the side close to the stator back iron 16, and the fixing protrusion is located in the fixing groove and is engaged with the fixing groove. Therefore, the present application does not limit the arrangement form of the fixing protrusion and the fixing groove on the stator back iron 16 or the first magnetic segment 12, the second magnetic segment 13, and the third magnetic segment 14, and it is only required that the stator back iron 16 can be connected to the above-mentioned magnetic segments.

[0052] It should be noted that the stator back iron 16 can also be bonded to the above-mentioned magnetic segment by means of a fixing glue. Therefore, the present application does not limit the connection method between the stator back iron 16 and the above-mentioned magnetic segment.

[0053] As an embodiment, the present application also provides a superconducting motor (not shown), which includes the above-mentioned annular stator structure 100, and the superconducting motor also includes a rotor 300, and a racetrack-shaped superconducting coil 200 is arranged inside the rotor 300. The annular stator structure 100 can improve the utilization rate of the superconducting coil 200 of the superconducting motor, 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 section 22 of the superconducting coil 200 can also be reduced, thereby improving the operating stability and service life of the superconducting motor.

[0054] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this 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 piece 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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