Stator core, stator assembly, motor and aircraft

Abstract

The utility model discloses a stator iron core, a stator assembly, a motor and an aircraft, the stator iron core comprises a stator yoke portion, the stator yoke portion is annular, the outer circumferential wall of the stator yoke portion is provided with first connecting portions arranged at intervals along the circumferential direction of the stator yoke portion; the plurality of stator tooth parts are arranged on the outer circumferential wall of the stator yoke part at intervals in the circumferential direction of the stator yoke part and are arranged in one-to-one correspondence with the plurality of first connecting parts, each stator tooth part is provided with a second connecting part matched with the first connecting part, and the stator yoke part and the stator tooth parts are independently formed parts; one of the first connecting part and the second connecting part comprises a groove, the other of the first connecting part and the second connecting part comprises a bulge matched with the groove, the groove and the bulge extend along the axial direction of the stator yoke part, and the width of the groove is gradually increased on a cross section perpendicular to the axis of the stator yoke part and in the direction from the opening of the groove to the bottom of the groove.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft power motors, and in particular to a stator core, a stator assembly, a motor and an aircraft. Background Art

[0002] Aircraft have much higher requirements for lightweight motors than automotive motors, and the increase in power density can bring about a significant increase in load. However, the conventional motor core is an integrated structure, and the stator teeth and yoke are stamped from silicon steel sheets. The stamped silicon steel sheets are stacked into an integrated core, and the silicon steel sheets stamped out of the slots are treated as waste. The material utilization rate is low, and the copper wire of the integrated core is difficult to wind, and the slot fill rate is low, resulting in low power density. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a stator core, which is convenient for winding copper wires, improves the copper wire slot full rate, increases the motor power density, increases the load of the aircraft, and produces less waste and has a high material utilization rate.

[0004] The utility model also provides a stator assembly, comprising the stator core mentioned above.

[0005] The utility model also provides a motor, comprising the above-mentioned stator assembly.

[0006] The utility model also provides an aircraft, comprising the above-mentioned motor.

[0007] According to the stator core of the embodiment of the utility model, it includes: a stator yoke part, which is annular, and the outer peripheral wall of the stator yoke part is provided with a first connecting part arranged at intervals along the circumferential direction of the stator yoke part; a plurality of stator tooth parts, which are arranged on the outer peripheral wall of the stator yoke part at intervals along the circumferential direction of the stator yoke part and are arranged one-to-one with the plurality of first connecting parts, each of the stator tooth parts has a second connecting part matching with the first connecting part, the stator yoke part and the stator tooth part are independent molded parts, one of the first connecting part and the second connecting part includes a groove, and the other includes a protrusion matching with the groove, the groove and the protrusion extend along the axial direction of the stator yoke part, and on a cross section perpendicular to the axis of the stator yoke part, the width of the groove gradually increases in the direction from the opening of the groove to the bottom of the groove.

[0008] According to the stator core of the embodiment of the utility model, a first connecting portion arranged at intervals along the circumferential direction of the stator yoke is provided on the outer peripheral wall of the stator yoke, a plurality of stator teeth are arranged on the outer peripheral wall of the stator yoke at intervals along the circumferential direction of the stator yoke and are arranged one-to-one with the plurality of first connecting portions, a second connecting portion cooperating with the first connecting portion is provided on each stator tooth, the stator yoke and the stator teeth are independent molded parts, so that copper wire can be wound on the stator teeth alone, which facilitates the winding of the copper wire, thereby improving the copper wire slot full rate, thereby improving the motor power density, thereby increasing the load-bearing capacity of the aircraft, and the stator yoke and the stator teeth can be stamped and produced separately, so that less waste is produced and the material utilization rate is high.

[0009] In some embodiments of the present invention, on a cross section perpendicular to the axis of the stator yoke, in a direction from the opening of the groove to the bottom of the groove, the opposite side walls of the groove are inclined in a direction away from each other; and / or, the grooves are a plurality of grooves spaced apart along the circumferential direction of the stator yoke, and the protrusions are a plurality of grooves corresponding one to one; and / or, the first connecting portion includes a groove, and the second connecting portion includes a protrusion, and on a cross section perpendicular to the axis of the stator yoke, the bottom wall of the groove is an arc with the center of the stator yoke as the center and a diameter of D, the inner diameter of the stator yoke is d1, and the outer diameter of the stator yoke is d2, 0.3(d1+d2)≤D≤0.8(d1+d2).

[0010] In some embodiments of the present invention, the gap between the groove and the protrusion is less than or equal to 0.1 mm.

[0011] In some embodiments of the present invention, the protrusion and the groove are interference fit; and / or the protrusion and the groove are adhesively connected.

[0012] The stator assembly according to the embodiment of the utility model comprises: the above-mentioned stator core, wherein a stator slot is formed between two adjacent stator teeth; and a stator winding, wherein the stator winding is wound in a plurality of the stator slots.

[0013] According to the stator assembly of the embodiment of the utility model, by setting the above-mentioned stator core, a first connecting portion arranged at intervals along the circumferential direction of the stator yoke is provided on the outer peripheral wall of the stator yoke, a plurality of stator teeth are arranged on the outer peripheral wall of the stator yoke at intervals along the circumferential direction of the stator yoke and are arranged one-to-one with the plurality of first connecting portions, a second connecting portion cooperating with the first connecting portion is provided on each stator tooth, the stator yoke and the stator teeth are independent molded parts, so that copper wire can be wound on the stator teeth alone, which is convenient for winding the copper wire, thereby improving the copper wire slot full rate, thereby improving the motor power density, thereby increasing the load-bearing capacity of the aircraft, and the stator yoke and the stator teeth can be stamped and produced separately, so that less waste is produced and the material utilization rate is high.

[0014] In some embodiments of the present invention, the area of ​​the stator slot excluding the stator winding is filled with an insulating member.

[0015] In some embodiments of the present invention, the stator assembly further includes: a stator sheath, wherein the stator sheath is arranged on the radial outer side of the stator core.

[0016] In some embodiments of the present invention, along the radial direction of the stator core, the thickness of the stator sheath is greater than or equal to 0.2 mm.

[0017] The motor according to the embodiment of the utility model includes the above-mentioned stator assembly.

[0018] According to the motor of the embodiment of the utility model, by setting the above-mentioned stator assembly and the above-mentioned stator core, a first connecting portion arranged at intervals along the circumferential direction of the stator yoke is provided on the outer peripheral wall of the stator yoke, a plurality of stator teeth are arranged on the outer peripheral wall of the stator yoke at intervals along the circumferential direction of the stator yoke and are arranged one-to-one with the plurality of first connecting portions, a second connecting portion cooperating with the first connecting portion is provided on each stator tooth, the stator yoke and the stator teeth are independent molded parts, so that copper wire can be wound on the stator teeth alone, which is convenient for winding the copper wire, thereby improving the copper wire slot full rate, thereby improving the motor power density, thereby increasing the load-bearing capacity of the aircraft, and the stator yoke and the stator teeth can be stamped and produced separately, so that less waste is produced and the material utilization rate is high.

[0019] According to the aircraft of the embodiment of the utility model,

[0020] According to the aircraft of the embodiment of the utility model, by setting the above-mentioned motor, setting the above-mentioned stator assembly, setting the above-mentioned stator core, a first connecting portion arranged at intervals along the circumferential direction of the stator yoke is provided on the outer peripheral wall of the stator yoke, a plurality of stator teeth are arranged on the outer peripheral wall of the stator yoke at intervals along the circumferential direction of the stator yoke and are arranged one-to-one with the plurality of first connecting portions, a second connecting portion cooperating with the first connecting portion is provided on each stator tooth, the stator yoke and the stator teeth are independent molded parts, so that copper wire can be wound on the stator teeth alone, thereby facilitating the winding of the copper wire, thereby improving the copper wire slot full rate, thereby improving the motor power density, thereby improving the load-bearing capacity of the aircraft, and the stator yoke and the stator teeth can be stamped and produced separately, so that less waste is produced and the material utilization rate is high.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a front view of a stator assembly according to an embodiment of the utility model;

[0024] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0025] Figure 3 is a front view of a stator yoke of a stator core according to an embodiment of the utility model;

[0026] Figure 4 yes Figure 3 The enlarged view of point B in the middle;

[0027] Figure 5 It is a front view of a stator tooth portion of a stator core according to an embodiment of the utility model.

[0028] Reference numerals:

[0029] 100. Stator assembly;

[0030] 10. Stator core;

[0031] 1. stator yoke; 11. first connecting portion; 12. groove;

[0032] 2. stator teeth; 21. second connecting portion; 22. protrusion;

[0033] 3. stator slot; 31. insulation;

[0034] 20. Stator winding;

[0035] 30. Stator jacket. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Reference below Figure 1-Figure 5 A stator core 10 according to an embodiment of the present invention is described.

[0040] like Figure 2-Figure 5 As shown, the stator core 10 according to the embodiment of the present invention includes: a stator yoke 1 and a plurality of stator teeth 2 .

[0041] Specifically, refer to Figure 3-Figure 5The stator yoke 1 is annular, and a first connecting portion 11 is provided on the outer peripheral wall of the stator yoke 1 and is spaced apart along the circumferential direction of the stator yoke 1; a plurality of stator teeth 2 are spaced apart along the circumferential direction of the stator yoke 1 on the outer peripheral wall of the stator yoke 1 and are arranged one-to-one corresponding to the plurality of first connecting portions 11, and each stator tooth 2 has a second connecting portion 21 that cooperates with the first connecting portion 11, and the stator yoke 1 and the stator tooth 2 are independent molded parts.

[0042] It can be understood that the stator yoke 1 and the stator tooth 2 are connected by the first connecting portion 11 and the second connecting portion 21, so that the stator yoke 1 and the stator tooth 2 can be spliced. As a result, copper wire winding can be performed on the stator tooth 2 alone, which facilitates the winding of the copper wire, thereby increasing the copper wire slot full rate, thereby improving the motor power density, and thus increasing the load-bearing capacity of the aircraft.

[0043] For example, Figure 1-Figure 3 In the example shown, the number of the first connection parts 11 and the number of the stator teeth 2 are both 24, but the present invention is not limited thereto. The number of the first connection parts 11 and the number of the stator teeth 2 can be other numbers, such as 12, 16, 28 or 30.

[0044] Furthermore, since the stator yoke 1 and the stator tooth 2 are independent molded parts, the stator yoke 1 and the stator tooth 2 can be stamped separately, which results in less waste and higher material utilization compared to the stator yoke and the stator tooth being an integrally molded part. At the same time, since the stator yoke 1 and the stator tooth 2 are independent molded parts, the stator yoke 1 and the stator tooth 2 can be made of different materials. The stator yoke 1 has a relatively small loss and a relatively low requirement for magnetic induction, so a relatively cheap silicon steel sheet can be used. The stator tooth 2 has a relatively large loss and a relatively high requirement for magnetic induction, so high-performance materials such as silicon steel or cobalt-iron silicon steel can be used, thereby further improving the performance of the motor.

[0045] Furthermore, if Figure 3-Figure 5 As shown, one of the first connecting portion 11 and the second connecting portion 21 includes a groove 12, and the other includes a protrusion 22 matching the groove 12, for example, Figure 4 and Figure 5 In the example shown, the first connection part 11 includes a groove 12, and the second connection part 21 includes a protrusion 22, but the first connection part 11 may include a protrusion 22, and the second connection part 21 may include a groove 12, the groove 12 and the protrusion 22 extend along the axial direction of the stator yoke 1, and on a cross section perpendicular to the axis of the stator yoke 1, the width of the groove 12 gradually increases in the direction from the opening of the groove 12 to the bottom of the groove 12.

[0046] It should be noted that, in the cross section perpendicular to the axis of the stator yoke 1, the width of the protrusion 22 gradually increases in the direction from the bottom of the protrusion 22 to the top of the protrusion 22, so that the protrusion 22 can be matched with the groove 12. When the protrusion 22 is matched with the groove 12, since the width of the opening of the groove 12 is smaller than the top of the protrusion 22, the protrusion 22 can be restricted from leaving the groove 12. Therefore, through the cooperation between the protrusion 22 and the groove 12, the stator yoke 1 and the stator tooth 2 are relatively fixed in the radial direction of the stator yoke 1, thereby improving the connection and installation reliability of the stator yoke 1 and the stator tooth 2. At the same time, the protrusion 22 cooperates with the groove 12, so that the first connecting portion 11 and the second connecting portion 21 can jointly bear the tensile force in the radial direction and tangential direction of the stator yoke 1, improve the radial and tangential stiffness of the stator core 10, and enable the stator core 10 to withstand a larger motor torque.

[0047] In addition, during installation, in order to ensure smooth installation, the protrusion 22 may be installed into the groove 12 along the axis of the stator yoke 1 , thereby achieving smooth matching between the protrusion 22 and the groove 12 .

[0048] Furthermore, if Figure 2 As shown, the ends of two adjacent stator teeth 2 away from the stator yoke 1 are spaced apart in the circumferential direction of the stator yoke 1 to form a slot. Since the copper wire can be wound on the stator teeth 2 alone, there is no need to wind the copper wire through the slot. The width of the slot along the circumferential direction of the stator yoke 1 can be designed to be smaller, thereby reducing torque pulsation and thus reducing motor vibration.

[0049] According to the stator core 10 of the embodiment of the utility model, a first connecting portion 11 is provided on the outer peripheral wall of the stator yoke 1 and is spaced apart along the circumferential direction of the stator yoke 1, a plurality of stator teeth 2 are spaced apart along the circumferential direction of the stator yoke 1 on the outer peripheral wall of the stator yoke 1 and are arranged one-to-one with the plurality of first connecting portions 11, a second connecting portion 21 matching with the first connecting portion 11 is provided on each stator tooth 2, the stator yoke 1 and the stator tooth 2 are independent molded parts, so that copper wire winding can be performed on the stator tooth 2 separately, thereby facilitating the winding of the copper wire, thereby improving the copper wire slot full rate, thereby improving the motor power density, thereby increasing the load-bearing capacity of the aircraft, and the stator yoke 1 and the stator tooth 2 can be stamped and produced separately, so that less waste is produced and the material utilization rate is high.

[0050] In some embodiments of the present invention, Figure 3 and Figure 4As shown, on a cross section perpendicular to the axis of the stator yoke 1, in a direction from the opening of the groove 12 to the groove bottom of the groove 12, the two opposite side walls of the groove 12 are inclined in a direction away from each other. Thus, the stator yoke 1 and the stator tooth 2 can be further relatively fixed in the radial direction of the stator yoke 1, thereby improving the connection and installation reliability of the stator yoke 1 and the stator tooth 2.

[0051] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, there are a plurality of grooves 12 spaced apart along the circumferential direction of the stator yoke 1, and there are a plurality of protrusions 22 corresponding one to one with the grooves 12. Thus, the connection reliability of the first connection portion 11 and the second connection portion 21 is further improved, and the limiting effect of the first connection portion 11 and the second connection portion 21 can be further improved, so that the stator yoke 1 and the stator tooth portion 2 are further relatively fixed in the radial direction of the stator yoke 1, and the connection and installation reliability of the stator yoke 1 and the stator tooth portion 2 is improved.

[0052] For example, Figure 3 and Figure 4 In the example shown, there are six protrusions 22 and six grooves 12 , but the present invention is not limited thereto. The number of protrusions 22 and six grooves 12 can be other numbers, such as four, five, seven or eight.

[0053] In some embodiments of the present invention, Figure 3-Figure 5 As shown, the first connecting part 11 includes a groove 12, and the second connecting part 21 includes a protrusion 22. On a cross section perpendicular to the axis of the stator yoke 1, the bottom wall of the groove 12 is an arc with the center of the stator yoke 1 as the center and a diameter of D. The inner diameter of the stator yoke 1 is d1, and the outer diameter of the stator yoke 1 is d2. 0.3(d1+d2)≤D≤0.8(d1+d2), such as D / (d1+d2) can be 0.3, 0.4, 0.6 or 0.8, etc.

[0054] It can be understood that if 0.3(d1+d2)>D, the groove 12 will be too shallow, resulting in unreliable fit between the groove 12 and the protrusion 22, and thus making the connection between the first connection part 11 and the second connection part 21 unreliable. If D>0.8(d1+d2), the groove 12 will be too deep, resulting in a small distance between the bottom wall of the groove 12 and the inner wall of the stator yoke 1, resulting in reduced structural strength of the stator yoke 1 and reduced durability.

[0055] Therefore, 0.3(d1+d2)≤D≤0.8(d1+d2), so that the groove 12 has a reasonable depth, which can not only ensure the connection reliability between the first connecting part 11 and the second connecting part 21, ensure the connection and installation reliability between the stator yoke 1 and the stator tooth part 2, but also ensure the structural strength of the stator yoke 1 and improve the durability.

[0056] In some embodiments of the present invention, the gap between the groove 12 and the protrusion 22 is less than or equal to 0.1 mm, and the gap between the groove 12 and the protrusion 22 can be -0.1 mm, 0 mm, 0.05 mm or 0.1 mm, etc. Thus, the looseness between the first connection part 11 and the second connection part 21 can be reduced, and the connection reliability between the first connection part 11 and the second connection part 21 is improved, thereby improving the connection and installation reliability of the stator yoke part 1 and the stator tooth part 2.

[0057] In some embodiments of the utility model, the protrusion 22 is interference fit with the groove 12, thereby avoiding looseness between the first connection part 11 and the second connection part 21, improving the connection reliability between the first connection part 11 and the second connection part 21, and thus improving the connection and installation reliability of the stator yoke part 1 and the stator tooth part 2.

[0058] In some embodiments of the present invention, the protrusion 22 is bonded to the groove 12. This avoids looseness between the first connection portion 11 and the second connection portion 21, improves the connection reliability between the first connection portion 11 and the second connection portion 21, and thus improves the connection and installation reliability of the stator yoke portion 1 and the stator tooth portion 2.

[0059] Reference below Figure 1 and Figure 2 A stator assembly 100 according to an embodiment of the present invention is described.

[0060] like Figure 1 and Figure 2 As shown, the stator assembly 100 according to the embodiment of the utility model comprises: the above-mentioned stator core 10 and stator winding 20, a stator slot 3 is formed between two adjacent stator teeth 2, and the stator winding 20 is wound in a plurality of stator slots 3. Thus, it is convenient to wind into the above-mentioned stator assembly 100, wherein it should be noted that the stator winding 20 comprises a plurality of sub-windings, a copper wire is wound on each stator tooth 2 to form a sub-winding, each sub-winding is arranged in the stator slot 3 on both sides of the stator tooth 2 wound thereon, and two adjacent sub-windings are spaced apart in the circumferential direction of the stator core 10, thereby avoiding dangers such as short circuit.

[0061] According to the stator assembly 100 of the embodiment of the utility model, by setting the above-mentioned stator core 10, a first connecting portion 11 is provided on the outer peripheral wall of the stator yoke 1 and is spaced apart along the circumferential direction of the stator yoke 1, and a plurality of stator teeth 2 are spaced apart along the circumferential direction of the stator yoke 1 on the outer peripheral wall of the stator yoke 1 and are arranged one-to-one with the plurality of first connecting portions 11, and a second connecting portion 21 cooperating with the first connecting portion 11 is provided on each stator tooth 2, and the stator yoke 1 and the stator tooth 2 are independent molded parts, so that copper wire can be wound on the stator tooth 2 separately, thereby facilitating the winding of the copper wire, thereby improving the copper wire slot full rate, thereby improving the motor power density, thereby increasing the load-bearing capacity of the aircraft, and the stator yoke 1 and the stator tooth 2 can be stamped and produced separately, so that less waste is produced and the material utilization rate is high.

[0062] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the area of ​​the stator slot 3 except the stator winding 20 is filled with an insulating member 31. It can be understood that the provision of the insulating member 31 is conducive to avoiding short circuits between two adjacent sub-windings, thereby improving safety. At the same time, the filling of the insulating member 31 can increase the overall rigidity of the stator assembly 100, thereby improving the working performance and service life of the stator assembly 100. It should be noted that the insulating member 31 is provided in the stator slot 3 by means of glue filling or plastic sealing.

[0063] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the stator assembly 100 further includes: a stator sheath 30, which is arranged on the radial outer side of the stator core 10. It can be understood that the stator sheath 30 can further limit the stator teeth 2 from being away from the stator yoke 1 in the radial direction of the stator yoke 1, thereby further improving the connection reliability and installation stability between the stator teeth 2 and the stator yoke 1, wherein the stator sheath 30 can be made of non-magnetic alloy or carbon fiber.

[0064] In some embodiments of the present invention, the thickness of the stator sheath 30 is greater than or equal to 0.2 mm along the radial direction of the stator core 10. The thickness of the stator sheath 30 may be 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm, etc., thereby improving the structural strength of the stator sheath 30, thereby further limiting the stator teeth 2 from being away from the stator yoke 1 along the radial direction of the stator yoke 1, and further improving the connection reliability and installation stability between the stator teeth 2 and the stator yoke 1.

[0065] The following describes a motor according to an embodiment of the present invention.

[0066] The motor according to the embodiment of the present invention includes the stator assembly 100 mentioned above.

[0067] According to the motor of the embodiment of the utility model, by setting the above-mentioned stator assembly 100 and the above-mentioned stator core 10, a first connecting portion 11 is provided on the outer peripheral wall of the stator yoke 1 and is spaced apart along the circumferential direction of the stator yoke 1, a plurality of stator teeth 2 are spaced apart along the circumferential direction of the stator yoke 1 on the outer peripheral wall of the stator yoke 1 and are arranged one-to-one with the plurality of first connecting portions 11, a second connecting portion 21 matching the first connecting portion 11 is provided on each stator tooth 2, the stator yoke 1 and the stator teeth 2 are independent molded parts, so that copper wire can be wound on the stator teeth 2 separately, thereby facilitating the winding of the copper wire, thereby improving the copper wire slot full rate, thereby improving the motor power density, thereby improving the load-bearing capacity of the aircraft, and the stator yoke 1 and the stator teeth 2 can be stamped and produced separately, so that less waste is obtained and the material utilization rate is high.

[0068] An aircraft according to an embodiment of the present invention is described below.

[0069] According to the aircraft of the embodiment of the utility model,

[0070] According to the aircraft of the embodiment of the utility model, the above-mentioned motor is arranged, the above-mentioned stator assembly 100 is arranged, and the above-mentioned stator core 10 is arranged. A first connecting portion 11 is arranged at intervals along the circumferential direction of the stator yoke 1 on the outer peripheral wall of the stator yoke 1, and a plurality of stator teeth 2 are arranged at intervals along the circumferential direction of the stator yoke 1 on the outer peripheral wall of the stator yoke 1 and are arranged one-to-one with the plurality of first connecting portions 11. A second connecting portion 21 cooperating with the first connecting portion 11 is arranged on each stator tooth 2. The stator yoke 1 and the stator tooth 2 are independent molded parts, so that copper wire can be wound on the stator tooth 2 separately, so that the winding of the copper wire is convenient, thereby improving the copper wire slot full rate, thereby improving the motor power density, and thereby improving the load-bearing capacity of the aircraft, and the stator yoke 1 and the stator tooth 2 can be stamped separately, so that the waste obtained in the production is small and the material utilization rate is high.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator core, characterized in that: include: A stator yoke, wherein the stator yoke is annular, and an outer peripheral wall of the stator yoke is provided with first connecting portions spaced apart along a circumferential direction of the stator yoke; A plurality of stator teeth, the plurality of stator teeth are arranged on the outer peripheral wall of the stator yoke at intervals along the circumferential direction of the stator yoke and are arranged one-to-one with the plurality of first connecting portions, each of the stator teeth has a second connecting portion that cooperates with the first connecting portion, the stator yoke and the stator teeth are independent molded parts, One of the first connecting part and the second connecting part includes a groove, and the other includes a protrusion matching the groove, the groove and the protrusion extend along the axial direction of the stator yoke, and on a cross section perpendicular to the axis of the stator yoke, the width of the groove gradually increases in the direction from the opening of the groove to the bottom of the groove.

2. The stator core according to claim 1, characterized in that: On a cross section perpendicular to the axis of the stator yoke, in a direction from the opening of the groove to the bottom of the groove, two opposite side walls of the groove are inclined away from each other; And / or, the grooves are multiple and spaced apart along the circumferential direction of the stator yoke, and the protrusions are multiple and correspond one to one with the grooves; And / or, the first connecting part includes a groove, the second connecting part includes a protrusion, and on a cross section perpendicular to the axis of the stator yoke, the bottom wall of the groove is an arc with the center of the stator yoke as the center and a diameter of D, the inner diameter of the stator yoke is d1, the outer diameter of the stator yoke is d2, and 0.3(d1+d2)≤D≤0.8(d1+d2).

3. The stator core according to claim 1, characterized in that: The gap between the groove and the protrusion is less than or equal to 0.1 mm.

4. The stator core according to claim 3, characterized in that: The protrusion and the groove are interference fit; And / or, the protrusion is adhesively connected to the groove.

5. A stator assembly, characterized in that: include: According to the stator core according to any one of claims 1 to 4, a stator slot is formed between two adjacent stator teeth; The stator winding is wound in the plurality of stator slots.

6. The stator assembly according to claim 5, characterized in that: The stator slots are filled with insulating members in areas excluding the stator windings.

7. The stator assembly according to claim 5, characterized in that: Also includes: A stator sheath is arranged on the radial outer side of the stator core.

8. The stator assembly according to claim 7, characterized in that: Along the radial direction of the stator core, the thickness of the stator sheath is greater than or equal to 0.2 mm.

9. A motor, characterized in that: Comprising a stator assembly according to any one of claims 5-8.

10. An aircraft, characterized in that: Comprising an electric machine according to claim 9.

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