Stator winding, axial flux motor and vehicle

Abstract

The invention discloses a stator winding, an axial flux motor and a vehicle, and belongs to the technical field of motors. The stator winding applied to the axial flux motor may include: a plurality of turns of coils in which a width of an inner side surface of each turn of coil in an axial direction of the axial flux motor is smaller than a width of an outer side surface of the coil in the axial direction of the axial flux motor, the inner side surface of the coil facing a stator core; the outer side surface of the coil is opposite to the inner side surface. The stator winding can prevent stress from being accumulated at the inflection point position, and can reduce the influence on the performance of the insulating layer at the outer side of the inflection point position of the stator winding, so as to effectively prolong the service life of the stator winding.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator winding, an axial flux motor and a vehicle. Background Art

[0002] An axial flux motor is a motor with an axial magnetic flux direction, which includes a stator core and a wire coil (i.e., a stator winding) wound on the stator core. At present, the stator winding is generally wound using an enameled wire with a circular or rectangular cross-section (the enameled wire is formed by wrapping a conductive wire with an insulating layer). Since the winding process requires the application of a bending force to the bent enameled wire, a large amount of stress is accumulated on the inner side of the inflection point of the stator winding, and a tensile force is generated on the outer side of the inflection point of the stator winding for the enameled wire. The combination of stress and tension causes the insulating layer on the outer side of the inflection point of the stator winding to become thinner and easily damaged, which affects the service life of the stator winding. Summary of the invention

[0003] In view of this, the present invention provides a stator winding, an axial flux motor and a vehicle, wherein the stator winding can avoid stress accumulation at the inflection point and can reduce the impact on the performance of the outer insulation layer at the inflection point of the stator winding, so as to effectively improve the service life of the stator winding.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a stator winding, which is applied to an axial flux motor, the stator winding comprising: a multi-turn coil, wherein:

[0006] The width of the inner side surface of each turn of the coil in the axial direction of the axial flux motor is smaller than the width of the outer side surface of the coil in the axial direction of the axial flux motor, and the inner side surface of the coil faces the stator core; the outer side surface of the coil is opposite to the inner side surface.

[0007] Optionally, for a coil group formed by stacking the coils in the axial direction of the motor,

[0008] In the axial direction of the motor, there is a gap between the inner side surfaces of every two adjacent turns of the coil in the coil group.

[0009] Optionally, the coil is wound by a wire, wherein the wire comprises a conductive core having a profiled cross section and an insulating layer wrapping the conductive core;

[0010] The conductive core comprises a first plane and a second plane which are parallel to each other, wherein a width of the first plane in the axial direction of the axial flux motor is smaller than a width of the second plane in the axial direction of the axial flux motor;

[0011] A first insulating portion of the insulating layer arranged corresponding to the first plane constitutes an inner side surface of the coil;

[0012] A second insulating portion of the insulating layer arranged corresponding to the second plane constitutes an outer side surface of the coil.

[0013] Optionally, the cross-section of the conductive core is approximately an isosceles trapezoid;

[0014] The first plane corresponds to the upper base of the approximately isosceles trapezoid;

[0015] The second plane corresponds to the lower base of the approximately isosceles trapezoid.

[0016] Optionally, the angle between two sides of the approximately isosceles trapezoid is 5° to 12°.

[0017] Optionally, the ratio of the height of the approximately isosceles trapezoid to the width of the lower base of the approximately isosceles trapezoid structure is 1.1 to 1.5.

[0018] Optionally, the cross-section of the wire is an axisymmetric structure.

[0019] Optionally, a transitional arc surface is formed between every two adjacent surfaces of the wire.

[0020] Optionally, a distance between the first plane and the second plane of the conductive core is 3.2 mm to 3.9 mm.

[0021] Optionally, a thickness of the first insulating portion is less than or equal to a thickness of the second insulating portion.

[0022] Optionally, the radius of the transition arc surface is 0.7 mm to 1.0 mm.

[0023] Optionally, the arc length of the transition arc surface cross section is 0.25 mm to 0.52 mm.

[0024] In a second aspect, an embodiment of the present invention provides an axial flux motor, comprising: a stator core and a stator winding provided by the embodiment of the first aspect or an embodiment related to the embodiment of the first aspect.

[0025] In a third aspect, an embodiment of the present invention provides a vehicle, comprising: the axial flux motor provided by the embodiment of the second aspect above.

[0026] The technical solution of the above invention has the following advantages or beneficial effects:

[0027] The stator winding for an axial flux motor provided in an embodiment of the present invention has a design in which the width of the inner side surface of each turn of the coil included in the stator winding is smaller than the width of the outer side surface of the coil. Therefore, compared with the outer side surface of the stator winding, less material is used on the inner side surface of the stator winding. The relative difference between the inner side surface and the outer side surface of the stator winding can reduce the accumulation of material on the inner side of the inflection point of the stator winding, reduce the stress toward the outward generated on the inner side of the inflection point, and reduce the tension on the outer side of the inflection point of the stator winding. The reduced tension can effectively reduce the damage to the insulation on the outer side of the inflection point of the stator winding, thereby improving the reliability of the insulation layer of the stator winding and effectively improving the durability of the stator winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of a cross-sectional structure of an axial flux motor observed along the axial direction provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a three-dimensional structure of a stator winding arranged in a housing of an axial flux motor provided according to an embodiment of the present invention;

[0030] Figure 3 is a plan view of a stator winding arranged in a housing of an axial flux motor according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of the three-dimensional structure of a coil group surrounded by a multi-turn stacked coil in a stator winding provided in an embodiment of the present invention;

[0032] Figure 5 is a top view along the axial direction of a coil group surrounded by a multi-turn stacked coil in a stator winding provided by an embodiment of the present invention;

[0033] Figure 6 Shows the Figure 4 The cross-sectional schematic diagram of the stacked coils obtained by the coil assembly along the cross section bb shown;

[0034] Figure 7 is a schematic diagram of a first cross-sectional structure of a special-shaped conductor for winding a coil provided in an embodiment of the present invention;

[0035] Figure 8 is a second cross-sectional schematic diagram of a special-shaped wire for winding a coil provided in an embodiment of the present invention;

[0036] Fig. 9 1 is a third cross-sectional schematic diagram of a special-shaped conductor for winding a coil provided according to an embodiment of the present invention.

[0037] The reference numerals are as follows:

[0038] 10- stator winding; 11- conductive core; 111- first plane; 112- second plane; 12- insulating layer; 121- first insulating portion arranged corresponding to the first plane; 122- second insulating portion arranged corresponding to the second plane; 13- inner side surface; 14- outer side surface; 20- stator core; 30- shell. DETAILED DESCRIPTION

[0039] At present, the stator winding for the axial flux motor is generally wound with a copper wire with a circular or rectangular cross-section. Regardless of whether the cross-section is a circular copper wire or a rectangular copper wire, material accumulation will occur on the inner side of the inflection point of the wound stator winding, and the accumulated material will generate stress toward the outside, which causes the outer side of the inflection point of the stator winding to be subjected to an outward force. In addition, the inflection point of the stator winding is also subjected to a bending force that keeps the copper wire bent, and the bending force causes the outer side of the inflection point of the stator winding to be subjected to a tensile force in the extension direction. The bending force and the stress toward the outside of the stator winding generated by the accumulated material act together, causing the insulation layer outside the inflection point of the stator winding to be stretched and deformed, resulting in thinning of the insulation layer, affecting the durability of the stator winding and the efficiency of the axial flux motor.

[0040] In order to solve the problems existing in the stator winding of the axial flux motor in the prior art, the embodiments of the present invention provide a novel stator winding, an axial flux motor including the stator winding, and a vehicle.

[0041] in, Figure 1 A schematic diagram of the cross-sectional structure of an axial flux motor viewed along the axial direction is shown by way of example. Figures 2 to 6 The structure schematic diagram of the stator winding and the coil group surrounded by the stacked multi-turn coils in the stator winding provided by the embodiment of the present invention is exemplarily shown; Figures 7 to 9 A cross-sectional schematic diagram of a special-shaped conductor for winding a stator winding provided by an embodiment of the present invention is shown.

[0042] It is worth noting that after the special-shaped wire is wound into a stator winding and the stator winding is installed in the axial flux motor, the cross-section of the special-shaped wire involved in the embodiment of the present invention is consistent with the axial direction of the axial flux motor (such as Figure 2 , Figure 4 and Figure 6 The direction A) shown is parallel.

[0043] In addition, the inner side surfaces, outer side surfaces, cross sections, etc. of various structures involved in the embodiments of the present invention are based on the posture of the stator core and the stator windings surrounding the stator core after being installed in the stator slots of the axial flux motor and positioned, and the stator core at this time is used as a reference. For example, after the stator core and the stator windings surrounding the stator core are installed in the stator slots of the axial flux motor and positioned, the inner side surface of the stator winding is the side facing the stator core, and the outer side surface of the stator winding is the side facing away from the stator core.

[0044] As used in the embodiments of the present invention, "one turn" or "single turn" generally refers to a coil of an annular structure formed by a conductor. The term "multiple turns" is usually used to include the meaning of "two turns or more". In addition, as used in the present invention, "installation", one structure "set" on another structure or one structure "set" around another structure or one structure corresponding to another structure should be understood in a broad sense, usually only indicating that there is a matching relationship and spatial position relationship between the two elements, and the two structures can be formed independently and then spliced ​​together, or one structure can be formed on the basis of another structure. For example, the stator core and the stator winding can be formed independently, and then the stator core and the stator winding are installed in the stator slots provided in the housing to achieve the stator winding being arranged around the stator core.

[0045] In addition, the terms “first” and “second” are only used for descriptive purposes, such as distinguishing different positions of a structure, and should not be understood as indicating or implying relative importance.

[0046] For example, Figure 1 As shown, the axial flux motor generally includes a housing 30 , a plurality of stator cores 20 installed in the housing 30 , and a stator winding 10 disposed around the stator cores 20 .

[0047] The stator core 20 is provided with a plurality of winding slots along the circumferential direction.

[0048] The stator winding 10 can be independently wound by a wire without relying on the stator core 20, and the independently wound stator winding 10 can be subsequently embedded in the winding slot of the stator core 20, and the stator winding 10 and the stator core 20 constitute the stator of the axial flux motor. In addition, the stator winding 30 can also be directly wound by a wire in the winding slot of the stator core 20.

[0049] The stator winding 10 involved in the embodiment of the present invention can be formed by any of the above-mentioned winding methods.

[0050] Specifically, Figures 2 to 6 As shown, the stator winding 10 applied to the axial flux motor provided by the embodiment of the present invention includes a plurality of coil turns.

[0051] like Figures 4 to 6As shown, each coil turn includes an inner side 13 and an outer side 14. Figure 6 As shown, the axial width of the inner side surface 13 of the coil is smaller than the axial width of the outer side surface 14 of the coil. In the embodiment of the present invention, the inner side surface 13 of the coil faces the stator core 20; the outer side surface 14 of the coil faces away from the inner side surface 13 of the coil.

[0052] Understandably, if Figures 1 to 3 As shown in FIG. 1 , for a structure in which a plurality of winding slots are arranged in the circumferential direction of the stator core 20, the multiple turns of the stator winding 10 are distributed in the circumferential direction as a plurality of coil groups. For each coil group, there may be only one turn of the coil, or Figure 4 and Figure 6 As shown, multiple turns of coils are stacked and wound in the axial direction of the axial flux motor. The number of turns of coils provided in each coil group can be determined according to the efficiency requirements of the axial flux motor. It is worth noting that the shape of the coil matches the core part surrounded by two adjacent winding slots, so that the coil can meet the needs of axial flux motors of different sizes and can keep the internal structure of the axial flux motor compact.

[0053] In addition, since the axial width of the inner side surface of each turn of the coil included in the stator winding is smaller than the axial width of the outer side surface of the coil, the inner side surface of the stator winding uses less material than the outer side surface of the stator winding. The relative difference between the inner and outer side surfaces of the stator winding can reduce the material accumulation on the inner side of the inflection point of the stator winding, reduce the stress generated on the inner side of the inflection point toward the outer side of the inflection point, and reduce the tensile force on the outer side of the inflection point of the stator winding. The reduced tensile force can effectively reduce the damage to the insulation layer of the stator winding located outside the inflection point, thereby improving the reliability of the insulation layer of the stator winding and effectively improving the durability of the stator winding.

[0054] Furthermore, for Figure 4 and Figure 6 The coil shown is in the axial direction of the axial flux motor (hereinafter referred to as the axial direction, wherein the axial direction of the axial flux motor is Figure 2 , Figure 4 and Figure 6 In the direction A) shown in the figure, in the axial direction, the two inner side surfaces 13 of each adjacent two turns of coils in the coil group are spaced apart in the axial direction, and the space makes the inner side surface of the coil group surrounded by the coils stacked in the axial direction (the inner side surface of the coil group is composed of the inner side surfaces 13 of multiple turns of coils) have a spacing as shown in the figure. Figure 6The gap G shown in the figure, and the outer side surface of the coil group (the outer side surface of the coil group is composed of the outer side surface 14 of multiple turns of coils) is tightly stacked. The existence of the gap G increases the contact area between the cooling oil and the stator winding. Therefore, the gap G can improve the heat dissipation capacity of the stator winding under peak operating conditions, so as to further improve the performance of the axial flux motor.

[0055] The coils in the stator windings of the above-mentioned various embodiments can be wound by wires. Specifically, the coils in the stator windings provided in the embodiments of the present invention are wound by special-shaped wires. For example, Figures 7 to 9 The cross-sectional structure of the special-shaped wire shown in FIG. 1 may include a conductive core 11 and an insulating layer 12 wrapping the conductive core 11. Specifically, as Figures 7 to 9 As shown, the conductive core 11 may include a first plane 111 and a second plane 112 which are parallel to each other, and the width of the first plane 111 in the axial direction is smaller than the width of the second plane 112 in the axial direction; Figures 7 to 9 As shown, the insulating layer 12 includes a first insulating portion 121 arranged corresponding to the first plane 111 and a second insulating portion 122 arranged corresponding to the second plane 112. After the wire is wound into a coil arranged around the stator core 20, the first insulating portion 121 arranged corresponding to the first plane 111 in the insulating layer 12 constitutes the inner side 13 of the coil; the second insulating portion 122 arranged corresponding to the second plane 112 in the insulating layer 12 constitutes the outer side 14 of the coil. The coil group wound using the special-shaped wire has Figure 6 It is worth noting that after the coil formed by winding the wire is arranged around the stator core 20, Figures 7 to 9 The cross section of the shaped conductor shown is parallel to the axial direction of the axial flux motor.

[0056] By designing the wire of the above structure, after it is surrounded by a coil, the coil is formed Figure 6 The structure shown in which the width of the inner side surface facing the stator core is smaller than the width of the outer side surface of the coil can reduce the amount of insulation layer and conductive core material of the wire, thereby reducing the weight and cost of the stator winding and effectively improving the efficiency of the motor.

[0057] The conductive core 11 can be made of any metal material with good conductivity and ductility. For example, the metal material used to make the conductive core includes but is not limited to copper, aluminum, silver, copper alloy, aluminum alloy, etc.

[0058] In addition, the insulating layer 12 may be formed by wrapping the conductive core 11 with an existing insulating thermoplastic resin such as plastic or silicone rubber. For example, the thermoplastic resin may be a polyamide material, a polyacetal material, a polycarbonate material, a polyphenylene ether material, a polyethylene material, a vinyl copolymer, etc. It is worth noting that these materials are only examples. In the embodiment of the present invention, the material used to form the insulating layer 12 is not limited.

[0059] The cross section of the conductor that encloses the coil of the stator winding 10 is generally an axisymmetric structure. After the stator winding 10 is arranged on the stator core 20, the axis of symmetry of the axisymmetric structure is perpendicular to the axis of the axial flux motor. In other words, the two planes arranged between the first plane 111 and the second plane 112 are symmetrically arranged. Through this symmetrical layout, the stator winding wound by the conductor has the same structure on both sides of the axis of symmetry, so that the axial flux motor can generate a stable magnetic field. In addition, the symmetrical layout of the conductor also facilitates the production of the conductor.

[0060] Specifically, for an example of an axisymmetric structure, the cross-section of the conductive core 11 of the special-shaped wire used for winding the coil can be Figure 7 The cross-section of the insulating layer 12 wrapping the conductive core 11 is approximately an isosceles trapezoid, and accordingly, the cross-section of the insulating layer 12 wrapping the conductive core 11 is also approximately an isosceles trapezoid. More specifically, the cross-section of the conductive core 11 is approximately an isosceles trapezoid, the first plane 111 corresponds to the upper base of the approximately isosceles trapezoid, and the second plane 112 corresponds to the lower base of the approximately isosceles trapezoid. Since the cross-section of the conductive core 11 is approximately an isosceles trapezoid and the cross-section of the insulating layer 12 wrapping the conductive core 11 is also approximately an isosceles trapezoid, the cross-section of the wire is also approximately an isosceles trapezoid.

[0061] like Figure 7 As shown, for the cross-section of the conductive core 11 that is approximately an isosceles trapezoid, the angle θ between the two sides of the approximately isosceles trapezoid is designed to be 5° to 12°. For example, the angle θ between the two sides can be 5°, 6°, 7°, 8°, 9°, 10°, etc. By limiting the angle θ between the two sides to between 5° and 12°, it can be ensured that there is sufficient contact area between the layers in the wound laminated coil, thereby ensuring the stability of the magnetic field generated by the stator winding. In a preferred embodiment, as Figure 7 As shown, the angle between the two sides of the cross-section of the insulating layer 12, which is approximately an isosceles trapezoid, is consistent with the angle between the two sides of the cross-section of the conductive core 11, which is approximately an isosceles trapezoid, and both are θ, so as to further ensure stable contact between the layers in the wound stacked coil.

[0062] In addition, by designing the angle θ between the two sides of the cross section of the conductive core 11 which is approximately an isosceles trapezoid and cooperating with the first plane 111 and the second plane 112 of the conductive core 11, the conductive core and the insulating layer can be closely fitted.

[0063] against Figure 7 The conductive core 11 shown has a cross section that is approximately an isosceles trapezoid, and there is a transition arc surface between every two adjacent faces. That is to say, for the conductive core 11 with a cross section that is approximately an isosceles trapezoid, there is a transition arc surface between the first plane 111 corresponding to the upper base of the approximately isosceles trapezoid and the face corresponding to the side of the approximately isosceles trapezoid, and there is also a transition arc surface between the second plane 112 corresponding to the lower base of the approximately isosceles trapezoid and the face corresponding to the side of the approximately isosceles trapezoid. Correspondingly, there is also a transition arc surface between every two adjacent faces of the insulating layer 12 with a cross section that is approximately an isosceles trapezoid. The transition arc surfaces of the conductive core 11 and the insulating layer 12 are as follows: Figure 7 The wire cross section is shown as an approximately isosceles trapezoidal chamfer, wherein the radius of the transition arc or chamfer can be selected in the range of 0.7mm to 1.0mm. For example, the radius of the transition arc or chamfer can be 0.7mm, 0.72mm, 0.75mm, 0.78mm, 0.8mm, 0.83mm, 0.85mm, 0.88mm, 0.9mm, 0.94mm, 0.95mm, 1.0mm, etc. Through this structural design, leakage at the inflection point of the stator winding can be avoided.

[0064] Furthermore, the arc length of the transition arc surface, that is Figure 7 The chamfer of the approximately isosceles trapezoid shown generally corresponds to an arc length l in the range of 0.25 mm to 0.52 mm. For example, the arc length may be 0.25 mm, 0.3 mm, 0.35 mm, 0.38 mm, 0.4 mm, 0.42 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.52 mm, etc. By limiting the arc length, it is possible to ensure that the upper and lower stacked wire segments in the stator winding wound by the wire are in close contact, and to ensure that the arrangement of the stacked coils is tight and stable, thereby ensuring that the magnetic field generated by the stator winding is stable.

[0065] Furthermore, for Figure 7 The cross section of the conductive core 11 shown is approximately an isosceles trapezoid, and the height (eg Figure 7 L) and the width of the lower base of the approximately isosceles trapezoid (such as Figure 1 The ratio between the upper and lower bases is designed to be 1.1 to 1.5. The width of the lower base of the approximately isosceles trapezoidal structure is essentially the maximum distance between the two sides of the approximately isosceles trapezoidal structure, and the two sides are located between the upper base and the lower base. For example, the height of the approximately isosceles trapezoidal structure (such as Figure 1 L) and the width of the lower base of the approximately isosceles trapezoidal structure (such as Figure 1 The ratio between the height of the approximately isosceles trapezoid and the width of the lower base of the approximately isosceles trapezoid can be designed to ensure that the stator winding wound by the wire generates a stable magnetic field. In addition, the ratio is matched with the angle θ between the two sides of the approximately isosceles trapezoid structure, which can further improve the stability of the wound stator winding and the stacked coils constituting the stator winding.

[0066] Furthermore, based on the cross-section of the conductive core 11 in the above-mentioned embodiments being approximately an isosceles trapezoid, Figure 7 As shown, the distance L between the first plane 111 and the second plane 112 is generally designed to be 3.2 mm to 3.9 mm. For example, the distance L between the first plane 111 and the second plane 112 can be designed to be 3.2 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, etc.

[0067] In a modified embodiment, the cross section of the conductive core 11 of the wire may also be as follows: Figure 8 As shown, the surface of the conductive core 11 between the first plane 111 and the second plane 112 is a special-shaped structure. Accordingly, the insulating layer 12 wrapping the conductive core 11 includes: a first insulating portion 121 arranged corresponding to the first plane 111, a second insulating portion 122 arranged corresponding to the second plane 112, and a special-shaped insulating portion located between the first insulating portion 121 and the second insulating portion 122. It can be understood that the first insulating portion 121, the second insulating portion 122 and the special-shaped insulating portion are integrally formed.

[0068] In another variant embodiment, the cross section of the conductive core 11 of the special-shaped wire can also be as follows: Fig. 9 As shown, the surface of the conductive core 11 between the first plane 111 and the second plane 112 is a curved surface. Correspondingly, the insulating portion between the first insulating portion 121 and the second insulating portion 122 is also a curved surface.

[0069] In addition, for Figure 8 or Fig. 9 In the special-shaped conductor shown in the figure, each adjacent surface of the conductive core 11 is also a transition arc surface, and each adjacent surface of the insulating layer 12 is also a transition arc surface. Figure 7 The design of the transition arc surface corresponding to the structure shown is similar and will not be repeated here.

[0070] against Figure 8 or Fig. 9The spacing L between the first plane 111 and the second plane 112 of the special-shaped wire shown is generally designed to be 3.2 mm to 3.9 mm. For example, the spacing L between the first plane 111 and the second plane 112 can be designed to be 3.1 mm, 3.2 mm, 3.3 mm, 3.5 mm, 3.8 mm, 3.9 mm, etc.

[0071] It is worth noting that any Figures 7 to 9 The deformed structures obtained by the cross-sectional structure of the wire shown are all within the protection scope of this application.

[0072] Furthermore, for Figures 7 to 9 In the special-shaped wire for winding the coil shown in any embodiment, the thickness L1 of the first insulating portion 121 arranged corresponding to the first plane 111 is less than or equal to the thickness L2 of the second insulating portion L2 arranged corresponding to the second plane 30. Wherein, in the case where the coil wound by the special-shaped wire is arranged around the stator core 20 of the axis flux motor, the thickness L1 of the first insulating portion 121 arranged corresponding to the first plane 111 refers to the height of the first insulating portion 121 in the radial direction of the axis flux motor, and the thickness L2 of the second insulating portion L2 arranged corresponding to the second plane 30 refers to the height of the second insulating portion L2 in the radial direction of the axis flux motor.

[0073] In a preferred embodiment, the thickness of the insulating layer at each position is consistent, so as to simplify the manufacturing process of the special-shaped wire used for winding the stator winding.

[0074] Furthermore, the present invention provides an axial flux motor, which comprises: a stator core and a stator winding provided by any of the above embodiments, wherein the stator winding is arranged around the stator core.

[0075] It is worth noting that the stator core and other components included in the axial flux motor can be directly selected from the components used in existing axial flux motors, and will not be described in detail here.

[0076] Furthermore, an embodiment of the present invention provides a vehicle, which may include the axial flux motor provided by the above embodiment.

[0077] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stator winding, which is applied to an axial flux motor, the stator winding comprising: Multi-turn coil, The width of the inner side surface (13) of each turn of the coil in the axial direction of the axial flux motor is smaller than the width of the outer side surface (14) of the coil in the axial direction of the axial flux motor, the inner side surface (13) of the coil faces the stator core (20), and the outer side surface (14) of the coil is opposite to the inner side surface (13).

2. The stator winding according to claim 1, characterized in that: For a coil group formed by winding multiple turns of the coil in a stacked manner in the axial direction of the axial flux motor, In the axial direction, there is a gap between the inner side surfaces (13) of every two adjacent turns of the coil in the coil group.

3. The stator winding according to claim 1, characterized in that: The coil is made by winding a wire, wherein the wire comprises a conductive core (11) with a special-shaped cross-section and an insulating layer (12) wrapping the conductive core (11); The conductive core (11) comprises a first plane (111) and a second plane (112) which are parallel to each other, wherein the width of the first plane (111) in the axial direction of the axial flux motor is smaller than the width of the second plane (112) in the axial direction of the axial flux motor; A first insulating portion (121) in the insulating layer (12) arranged corresponding to the first plane (111) constitutes an inner side surface (13) of the coil; A second insulating portion (122) in the insulating layer (12) arranged corresponding to the second plane (112) constitutes an outer side surface (14) of the coil.

4. The stator winding according to claim 1, characterized in that: The cross section of the conductive core (11) is approximately an isosceles trapezoid; The first plane (111) corresponds to the upper base of the approximately isosceles trapezoid; The second plane (112) corresponds to the lower base of the approximately isosceles trapezoid.

5. The stator winding according to claim 4, characterized in that: The angle between the two sides of the approximately isosceles trapezoid is 5° to 12°.

6. The stator winding according to claim 4 or 5, characterized in that: The ratio between the height of the approximately isosceles trapezoidal structure and the width of the lower base of the approximately isosceles trapezoidal structure is 1.1 to 1.

5.

7. The stator winding according to any one of claims 3 to 5, characterized in that: The cross section of the wire is an axisymmetric structure.

8. The stator winding according to any one of claims 3 to 5, characterized in that: A transitional arc surface is formed between every two adjacent surfaces of the conductor.

9. The stator winding according to any one of claims 3 to 5, characterized in that: The distance between the first plane (111) and the second plane (112) of the conductive core (11) is 3.2 mm to 3.9 mm; and / or, The thickness of the first insulating portion (121) is less than or equal to the thickness of the second insulating portion (122).

10. The stator winding according to claim 8, characterized in that: The radius of the transition arc surface is 0.7mm to 1.0mm; and / or, The arc length of the transition arc surface cross section is 0.25 mm to 0.52 mm.

11. An axial flux motor, characterized in that: include: A stator core and a stator winding as claimed in any one of claims 1 to 10.

12. A vehicle, characterized in that: include: The axial flux motor of claim 11.

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