Stator structure, axial flux electric machine, powertrain and vehicle

Abstract

The embodiment of the application provides a kind of stator structure, axial flux motor, power assembly and vehicle, stator structure at least includes coaxial arrangement stator assembly, stator outer diameter support and stator inner diameter support;Along the radial direction of stator assembly, stator outer diameter support is located at the outside of stator assembly, and stator inner diameter support is located at the inside of stator assembly;Stator assembly includes stator core and at least two groups of armature winding;At least two groups of armature winding are spaced apart along the circumferential direction of stator core and are wound on stator core respectively;Further comprising: at least two fixing pieces;At least two fixing pieces are spaced apart along the circumferential direction of stator core, each fixing piece is located between two adjacent groups of armature winding, and each fixing piece passes through stator outer diameter support, stator core and stator inner diameter support along the radial direction of stator core to fix stator outer diameter support, stator core and stator inner diameter support, which can improve the overall strength of stator structure.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of magnetic flux motor, in particular to a stator structure, an axial flux motor, a power assembly and a vehicle. BACKGROUND

[0002] The axial flux motor has the characteristics of high torque density and high power density due to its large air gap plane and compact structure. In application scenarios with size and weight limitations, for example, in electric vehicle drive motor applications, the axial flux motor has obvious application advantages compared to the radial motor at the same rotational speed.

[0003] In related technologies, the stator structure of the axial flux motor includes a stator assembly, a first end cover and a second end cover. The stator assembly includes an inner side support, a stator and an outer side housing which are sequentially nested and arranged along the radial direction from inside to outside. The stator includes a stator core and a stator winding wound on the stator core, and the stator core is a structure continuously wrapped around the inner side support. The first end cover and the second end cover are respectively arranged at both ends of the stator assembly along the axial direction. The first end cover, the inner side housing, the second end cover and the outer side housing are sequentially and sealingly connected and collectively surround to form a cooling cavity, and the stator is located in the cooling cavity.

[0004] However, in the above scheme, the overall strength of the stator structure is poor, resulting in low reliability of the axial flux motor. SUMMARY

[0005] Embodiments of the present application provide a stator structure, an axial flux motor, a power assembly and a vehicle, which can improve the overall strength of the stator structure, thereby improving the overall reliability of the stator structure, and further improving the overall reliability of the axial flux motor.

[0006] In a first aspect, the embodiments of the present application provide a stator structure, which at least includes: a stator assembly, a stator outer diameter support and a stator inner diameter support which are coaxially arranged; along the radial direction of the stator assembly, the stator outer diameter support is located on the outer side of the stator assembly, and the stator inner diameter support is located on the inner side of the stator assembly; the stator assembly includes a stator core and at least two groups of armature windings; the at least two groups of armature windings are spaced apart along the circumferential direction of the stator core and are wound on the stator core respectively; further comprising: at least two fixing members; the at least two fixing members are spaced apart along the circumferential direction of the stator core, each of the fixing members is located between the adjacent two groups of armature windings, and each of the fixing members passes through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core to fix the stator outer diameter support, the stator core and the stator inner diameter support.

[0007] The stator structure provided by the embodiments of the present application is provided with at least two fixing members distributed along the circumferential direction of the stator core. By arranging each fixing member between two adjacent groups of armature windings, each fixing member penetrates the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core to fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole. Compared with the way of installing the stator outer diameter support and the stator core and the stator inner diameter support by inner and outer ring interference in the prior art, the embodiments of the present application arrange multiple fixing members in the circumferential direction of the stator core, and fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole by penetrating the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core, which can improve the overall strength of the stator structure, thereby improving the overall reliability of the stator structure and the axial flux motor. Moreover, since the fixing members have high fixing strength on the stator outer diameter support, the stator core and the stator inner diameter support, the coaxiality of the stator outer diameter support, the stator core and the stator inner diameter support can be further ensured, thereby being more conducive to the mass production of the stator structure.

[0008] In a possible implementation, the outer peripheral wall of the stator core is provided with at least two first grooves distributed along the circumferential direction of the stator core, and each first groove is used for inserting one fixing member.

[0009] By arranging at least two first grooves distributed along the circumferential direction of the stator core on the outer peripheral wall of the stator core, and inserting the fixing member into the first groove, the stator outer diameter support, the stator core and the stator inner diameter support are fixed.

[0010] In a possible implementation, the outer peripheral wall of the stator core is provided with multiple second grooves distributed along the circumferential direction of the stator core, and the second grooves are arranged opposite to and staggered with the first grooves, and the second grooves are used for accommodating the armature windings.

[0011] By arranging multiple second grooves distributed along the circumferential direction of the stator core on the outer peripheral wall of the stator core, the second grooves can provide accommodation space for the armature windings. In addition, the second grooves are arranged opposite to and staggered with the first grooves, which can avoid interference between the first grooves and the second grooves.

[0012] In a possible implementation, the second groove is a stepped groove; the stepped groove comprises a first part and a second part connected to the first part; the first part is close to the outer surface of the stator core, the second part is away from the outer surface of the stator core, and the aperture of the first part is larger than the aperture of the second part; wherein the first part is used for accommodating the armature winding, and the second part is used for accommodating the liquid.

[0013] By designing the second groove as a stepped groove comprising a first part and a second part, the first part and the second part are stacked in the extension direction (i.e. the depth direction) of the second groove, the second part close to the groove bottom of the second groove can be used for circulating the liquid, and the first part close to the groove opening of the second groove can be used for accommodating the armature winding.

[0014] In a possible implementation, each group of the armature winding comprises a first sub-winding and a second sub-winding; in the axial direction of the stator core, the first sub-winding and the second sub-winding have a gap therebetween, and the gap is used for accommodating the liquid.

[0015] By designing each group of the armature winding to comprise a first sub-winding and a second sub-winding, the first sub-winding and the second sub-winding are stacked in the axial direction of the stator core, and the first sub-winding and the second sub-winding have a gap therebetween, the gap between the first sub-winding and the second sub-winding can be used for accommodating the liquid, so that the contact area between the armature winding and the liquid can be increased, thereby effectively reducing the temperature rise of the armature winding.

[0016] In a possible implementation, the method further comprises: providing a first sealing plate and a second sealing plate; in the axial direction of the stator assembly, the first sealing plate and the second sealing plate are respectively located on both sides of the stator assembly and are coaxially arranged with the stator assembly; the first sealing plate abuts against one side of the stator outer diameter support and the stator inner diameter support, and the second sealing plate abuts against the other side of the stator outer diameter support and the stator inner diameter support. By arranging the first sealing plate and the second sealing plate coaxial with the stator assembly on both sides of the stator assembly, a space for accommodating the liquid can be formed between the stator assembly and the first sealing plate and between the stator assembly and the second sealing plate, respectively.

[0017] In a possible implementation, the stator outer diameter partition plate further comprises: a plurality of stator outer diameter partition plates; the plurality of stator outer diameter partition plates are arranged along the circumferential direction of the stator outer diameter support, and each of the stator outer diameter partition plates is located between two adjacent groups of the armature windings; the plurality of stator outer diameter partition plates are located in the space between the stator outer diameter support and the first sealing plate, or the plurality of stator outer diameter partition plates are located in the space between the stator outer diameter support and the second sealing plate, or part of the plurality of stator outer diameter partition plates are located in the space between the stator outer diameter support and the first sealing plate, and the remaining part of the plurality of stator outer diameter partition plates are located in the space between the stator outer diameter support and the second sealing plate.

[0018] By arranging the plurality of stator outer diameter partition plates on at least one side surface of the stator outer diameter support, and arranging the plurality of stator outer diameter partition plates along the circumferential direction of the stator outer diameter support, the stator outer diameter partition plate can block the flow of liquid, so that the flow speed of the liquid in the stator structure can be reduced, thereby increasing the flow time of the liquid in the stator structure, and further reducing the temperature rise.

[0019] In a possible implementation, each of the stator outer diameter partition plates has an opening, and two adjacent groups of the armature windings are connected in communication through the opening. By arranging the opening on the stator outer diameter partition plate, and arranging each of the stator outer diameter partition plates between two adjacent groups of the armature windings, the two adjacent groups of the armature windings can be connected in communication through the opening, thereby avoiding the problem that the armature winding needs to jump over the stator outer diameter partition plate to realize connection, resulting in a large span of the armature winding and being prone to being pulled.

[0020] In a possible implementation, the number of the stator outer diameter partition plates is eight; four of the stator outer diameter partition plates are arranged along the circumferential direction of the stator outer diameter support on one side surface of the stator outer diameter support, and the interval between two adjacent stator outer diameter partition plates of the four stator outer diameter partition plates is 90°; the other four stator outer diameter partition plates are arranged along the circumferential direction of the stator outer diameter support on the other side surface of the stator outer diameter support, and the interval between two adjacent stator outer diameter partition plates of the four stator outer diameter partition plates is 90°.

[0021] The more the number of the stator outer diameter partition plates arranged, the better the stator outer diameter partition plate can block the flow of liquid, so that the flow speed of the liquid in the stator structure can be more effectively reduced, thereby more effectively increasing the flow time of the liquid in the stator structure, and further reducing the temperature rise.

[0022] In a possible implementation, projections of the four stator outer diameter blocking plates on one side surface of the stator outer diameter support along the axial direction of the stator outer diameter support are at least partially non-coincident with projections of the four stator outer diameter blocking plates on the other side surface of the stator outer diameter support along the axial direction of the stator outer diameter support.

[0023] In a possible implementation, projections of the four stator outer diameter blocking plates on one side surface of the stator outer diameter support along the axial direction of the stator outer diameter support are at least partially non-coincident with projections of the four stator outer diameter blocking plates on the other side surface of the stator outer diameter support along the axial direction of the stator outer diameter support, and the difference between the projections in the circumferential direction of the stator outer diameter support is 45 degrees.

[0024] In a possible implementation, the plurality of stator inner diameter blocking plates are spaced apart along the circumferential direction of the stator inner diameter support, are located in the space between the stator inner diameter support and the first sealing plate, or are located in the space between the stator inner diameter support and the second sealing plate, or part of the plurality of stator inner diameter blocking plates are located in the space between the stator inner diameter support and the first sealing plate, and the remaining part of the plurality of stator inner diameter blocking plates are located in the space between the stator inner diameter support and the second sealing plate.

[0025] By arranging the plurality of stator inner diameter blocking plates on at least one side surface of the stator inner diameter support and spacing apart the plurality of stator inner diameter blocking plates along the circumferential direction of the stator inner diameter support, the stator inner diameter blocking plates can block the flow of liquid, so that the flow speed of the liquid in the stator structure can be reduced, the flow time of the liquid in the stator structure can be increased, and the temperature rise can be further reduced.

[0026] In a possible implementation, the number of the stator inner diameter blocking plates is eight; four of the stator inner diameter blocking plates are spaced apart along the circumferential direction of the stator inner diameter support on one side surface of the stator inner diameter support, and the interval between any two adjacent stator inner diameter blocking plates is 90 degrees; and the other four stator inner diameter blocking plates are spaced apart along the circumferential direction of the stator inner diameter support on the other side surface of the stator inner diameter support, and the interval between any two adjacent stator inner diameter blocking plates is 90 degrees.

[0027] The more baffles are installed in the inner diameter of the stator, the better they can block the flow of liquid. This can more effectively reduce the flow velocity of liquid inside the stator structure, thereby increasing the flow time of liquid inside the stator structure and further reducing the temperature rise.

[0028] In one possible implementation, the projections of the four stator inner diameter baffles located on one side surface of the stator inner diameter support along the axial direction of the stator inner diameter support do not at least partially coincide with the projections of the four stator inner diameter baffles located on the other side surface of the stator inner diameter support along the axial direction of the stator inner diameter support.

[0029] In one possible implementation, the projections of the four stator inner diameter baffles located on one side surface of the stator inner diameter bracket along the axial direction of the stator inner diameter bracket differ by 45° from the projections of the four stator inner diameter baffles located on the other side surface of the stator inner diameter bracket along the axial direction of the stator inner diameter bracket in the circumferential direction of the stator inner diameter bracket.

[0030] In one possible implementation, the stator outer diameter support is provided with a plurality of first through holes, which are used to connect the two sides of the stator outer diameter support. By providing a plurality of first through holes on the stator outer diameter support, it is possible to connect the space for containing liquid formed between the stator assembly and the first sealing plate with the space for containing liquid formed between the stator assembly and the second sealing plate, thereby increasing the flow area and flow range of liquid inside the stator structure.

[0031] In one possible implementation, the stator inner diameter support is provided with a plurality of second through holes, which are used to connect the two sides of the stator inner diameter support. By providing a plurality of first through holes on the stator inner diameter support, it is also possible to connect the space for containing liquid formed between the stator assembly and the first sealing plate with the space for containing liquid formed between the stator assembly and the second sealing plate, thereby increasing the flow area and flow range of liquid inside the stator structure.

[0032] In one possible implementation, the system further includes an outer casing; the outer casing is fitted onto the outer peripheral wall of the stator outer diameter bracket, and the outer casing is fixed to the stator outer diameter bracket. The outer casing provides protection for the stator outer diameter bracket and the stator assembly.

[0033] In a possible implementation, the shell body is provided with at least one liquid inlet and at least one liquid outlet; and the liquid inlet and the liquid outlet are in communication with the second groove. By providing the shell body with at least one liquid inlet and at least one liquid outlet in communication with the second groove, liquid enters the space between the stator outer diameter support and the first sealing plate and the space between the stator outer diameter support and the second sealing plate through the liquid inlet, then enters the space between the stator inner diameter support and the first sealing plate and the space between the stator inner diameter support and the second sealing plate through the second groove, then enters the space between the stator outer diameter support and the first sealing plate and the space between the stator outer diameter support and the second sealing plate through the second groove, and finally flows out of the stator structure through the liquid outlet.

[0034] In a possible implementation, the liquid inlet and the liquid outlet are arranged opposite to each other in the vertical direction; and the liquid inlet is arranged higher than the liquid outlet. By arranging the liquid inlet and the liquid outlet opposite to each other in the vertical direction and arranging the liquid inlet higher than the liquid outlet, liquid can flow out of the liquid outlet by gravity after entering the stator structure, thereby reducing the hydraulic requirement of the stator structure and achieving sufficient liquid flow in the stator structure by gravity.

[0035] In a possible implementation, the stator core, the stator outer diameter support and the stator inner diameter support are integrally cast.

[0036] In a possible implementation, the stator core, the stator outer diameter support, the stator inner diameter support, the at least two fixing members, the plurality of stator outer diameter partition plates and the plurality of stator inner diameter partition plates are integrally cast.

[0037] In a second aspect, the embodiments of the present application provide an axial flux motor, which comprises at least one rotor structure and at least one stator structure as described above; and the stator structure and the rotor structure are alternately arranged along the axial direction of the axial flux motor.

[0038] The axial flux motor provided by the embodiment of the present application comprises a stator structure, and the stator structure is provided with at least two fixing members which are distributed along the circumferential direction of the stator core. Each fixing member is arranged between two adjacent groups of armature windings, and passes through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core, so as to fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole. Compared with the way of installing the stator outer diameter support and the stator core and the stator inner diameter support by means of inner and outer ring interference in the prior art, the embodiment of the present application is provided with a plurality of fixing members along the circumferential direction of the stator core, and the fixing members pass through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core to fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole, so as to improve the overall strength of the stator structure, and thus the overall reliability of the stator structure and the overall reliability of the axial flux motor. Moreover, since the fixing members have high fixing strength on the stator outer diameter support, the stator core and the stator inner diameter support, the coaxiality of the stator outer diameter support, the stator core and the stator inner diameter support can be further ensured, so as to be more conducive to the mass production of the stator structure.

[0039] That is, by arranging the above stator structure in the axial flux motor, the reliability of the stator structure in the axial flux motor is high, so that the reliability of the axial flux motor is high, which can optimize the use performance of the axial flux motor.

[0040] In a third aspect, the embodiment of the present application provides a power assembly, which comprises the axial flux motor as described above.

[0041] The power assembly provided by the embodiment of the present application comprises at least an axial flux motor, and the axial flux motor comprises at least a stator structure, and the stator structure is provided with at least two fixing members distributed along the circumferential direction of the stator core. Each fixing member is arranged between two adjacent groups of armature windings, and passes through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core, so as to fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole. Compared with the way of installing the stator outer diameter support and the stator core and the stator inner diameter support by means of inner and outer ring interference in the prior art, the embodiment of the present application is provided with a plurality of fixing members along the circumferential direction of the stator core, and the fixing members pass through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core to fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole, so as to improve the overall strength of the stator structure, thereby improving the overall reliability of the stator structure, and further improving the overall reliability of the axial flux motor. Moreover, the fixing strength of the fixing members on the stator outer diameter support, the stator core and the stator inner diameter support is high, so as to further ensure the coaxiality of the stator outer diameter support, the stator core and the stator inner diameter support, thereby being more conducive to the mass production of the stator structure.

[0042] That is, by arranging the above axial flux motor in the power assembly, the reliability of the axial flux motor is high due to the high reliability of the stator structure in the axial flux motor, thereby making the overall reliability of the power assembly high.

[0043] In a fourth aspect, the embodiment of the present application provides a vehicle, which comprises at least a front wheel, a rear wheel, a vehicle body and the above-mentioned axial flux motor. The vehicle body is connected between the front wheel and the rear wheel, and the axial flux motor is installed on the vehicle body.

[0044] The vehicle provided by the embodiment of the present application comprises at least an axial flux motor, and the axial flux motor comprises at least a stator structure, and the stator structure is provided with at least two fixing members distributed along the circumferential direction of the stator core. Each fixing member is arranged between two adjacent groups of armature windings, and passes through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core, so as to fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole. Compared with the way of installing the stator outer diameter support and the stator core and the stator inner diameter support by means of inner and outer ring interference in the prior art, the embodiment of the present application sets a plurality of fixing members in the circumferential direction of the stator core, and fixes the stator outer diameter support, the stator core and the stator inner diameter support as a whole by means of the plurality of fixing members passing through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core, so as to improve the overall strength of the stator structure, and thus improve the overall reliability of the stator structure, and further improve the overall reliability of the axial flux motor. Moreover, the fixing strength of the fixing members on the stator outer diameter support, the stator core and the stator inner diameter support is high, so as to further ensure the coaxiality of the stator outer diameter support, the stator core and the stator inner diameter support, and thus facilitate the mass production of the stator structure.

[0045] That is, by setting the above axial flux motor in the vehicle, the reliability of the axial flux motor is high due to the high reliability of the stator structure in the axial flux motor, and thus the overall reliability of the vehicle is high, so as to optimize the use performance and safety performance of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The overall structure schematic diagram of the stator structure provided by an embodiment of the present application is shown in the figure;

[0047] Figure 2 The overall structure schematic diagram of the stator structure provided by an embodiment of the present application is shown in the figure;

[0048] Figure 3 The split structure schematic diagram of the stator structure provided by an embodiment of the present application is shown in the figure;

[0049] Figure 4 The structure schematic diagram of the stator core and the fixing member in the stator structure provided by an embodiment of the present application is shown in the figure;

[0050] Figure 5 The structure schematic diagram of the stator core and the fixing member in the stator structure provided by an embodiment of the present application is shown in the figure;

[0051] Figure 6 The structure schematic diagram of the stator core and the fixing member in the stator structure provided by an embodiment of the present application is shown in the figure;

[0052] Figure 7 A structure diagram of the first slot and the second slot on the stator structure provided by an embodiment of the present application is shown in FIG. 1;

[0053] Figure 8 A structure diagram of the first slot and the second slot on the stator structure provided by an embodiment of the present application is shown in FIG. 1;

[0054] Figure 9 A structure diagram of the armature winding in the stator structure provided by an embodiment of the present application is shown in FIG. 2;

[0055] Figure 10 A structure diagram of the armature winding in the stator structure provided by an embodiment of the present application is shown in FIG. 2;

[0056] Figure 11 A structure diagram of the armature winding in the stator structure provided by an embodiment of the present application is shown in FIG. 2;

[0057] Figure 12 A structure diagram of the armature winding in the stator structure provided by an embodiment of the present application is shown in FIG. 2;

[0058] Figure 13 A structure diagram of the armature winding in the stator structure provided by an embodiment of the present application is shown in FIG. 2;

[0059] Figure 14 A structure diagram of the stator core, the stator outer diameter support and the stator inner diameter support in the stator structure provided by an embodiment of the present application is shown in FIG. 3;

[0060] Figure 15 A structure diagram of the stator core, the stator outer diameter support and the stator inner diameter support in the stator structure provided by an embodiment of the present application is shown in FIG. 3;

[0061] Figure 16 A structure diagram of the stator assembly, the stator outer diameter support, the stator inner diameter support and the outer shell in the stator structure provided by an embodiment of the present application is shown in FIG. 4;

[0062] Figure 17 A structure diagram of the stator assembly, the stator outer diameter support, the stator inner diameter support and the outer shell in the stator structure provided by an embodiment of the present application is shown in FIG. 4;

[0063] Figure 18 A structure diagram of the stator core, the stator outer diameter support and the stator inner diameter support in the stator structure provided by an embodiment of the present application is shown in FIG. 3;

[0064] Figure 19 A structure diagram of the stator core, the stator outer diameter support and the stator inner diameter support in the stator structure provided by an embodiment of the present application is shown in FIG. 3;

[0065] Figure 20A structure schematic view of a stator core, a stator outer diameter support and a stator inner diameter support in a stator structure provided by an embodiment of the present application is shown in the figure.

[0066] Figure 21 A structure schematic view of a stator core, a stator outer diameter support and a stator inner diameter support in a stator structure provided by an embodiment of the present application is shown in the figure.

[0067] Legend of reference signs:

[0068] 100 - stator structure; 110 - stator assembly; 111 - stator core;

[0069] 1111 - first groove; 1112 - second groove; 1112A - first part;

[0070] 1112B - second part; 112 - armature winding; 112A - armature winding slot part;

[0071] 112B - armature winding end part; 1121 - first armature winding; 1121A - first sub-winding;

[0072] 1121B - second sub-winding; 1122 - second armature winding; 1123 - third armature winding;

[0073] 1124 - fourth armature winding; 1125 - fifth armature winding; 1126 - sixth armature winding;

[0074] 1127 - seventh armature winding; 1128 - eighth armature winding; 1129 - gap;

[0075] 120 - stator outer diameter support; 121 - first sub-through hole; 122 - second sub-through hole;

[0076] 123 - third sub-through hole; 124 - fourth sub-through hole; 130 - stator inner diameter support;

[0077] 131 - fifth sub-through hole; 132 - sixth sub-through hole; 133 - seventh sub-through hole;

[0078] 134 - eighth sub-through hole; 140 - fixing member; 150 - first sealing plate;

[0079] 160 - second sealing plate; 170 - stator outer diameter blocking plate; 171 - opening;

[0080] 1711 - first stator outer diameter blocking plate; 1712 - second stator outer diameter blocking plate; 1713 - third stator outer diameter blocking plate;

[0081] 1714 - fourth stator outer diameter baffle; 1715 - fifth stator outer diameter baffle; 1716 - sixth stator outer diameter baffle;

[0082] 1717 - seventh stator outer diameter baffle; 1718 - eighth stator outer diameter baffle; 180 - stator inner diameter baffle;

[0083] 1811 - first stator inner diameter baffle; 1812 - second stator inner diameter baffle; 1813 - third stator inner diameter baffle;

[0084] 1814 - fourth stator inner diameter baffle; 1815 - fifth stator inner diameter baffle; 1816 - sixth stator inner diameter baffle;

[0085] 190 - outer housing; 191 - liquid inlet; 1911 - first liquid inlet;

[0086] 1912 - second liquid inlet; 192 - liquid outlet; 1921 - first liquid outlet;

[0087] 1922 - second liquid outlet; 1001 - first region; 1002 - second region. DETAILED DESCRIPTION

[0088] The terms used in the embodiments section of the present application are used only to explain specific embodiments of the present application, and are not intended to limit the present application, and the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0089] Electric motors (i.e., electric machines) generally convert electrical energy into mechanical work by producing torque. Electric vehicles (including hybrid vehicles) employ electric motors such as induction and permanent magnet motors to drive the vehicle and to capture braking energy when used as generators. Generally, an electric motor includes a rotor that rotates during operation and a stator that is stationary. The rotor can contain a plurality of permanent magnets and rotates relative to the fixed stator. The rotor is connected to a rotor shaft that also rotates with the rotor. The rotor including the permanent magnets is separated from the stator by a predetermined air gap. The stator includes conductors in the form of wire windings. When electrical energy is applied through the wire windings, a magnetic field is produced. When electrical energy or power is fed into the electrically conductive windings of the stator, power can be transferred across the air gap by magnetic flux, producing torque that acts on the permanent magnets in the rotor. In this manner, mechanical power can be delivered to or extracted from the rotating rotor shaft. In electric vehicles, the rotor thus delivers torque to the drive wheels of the vehicle via a rotating shaft through a gear set.

[0090] Currently, two common types of motors include radial flux motors and axial flux motors. In a radial flux motor, the rotor and stator are typically located in a concentric or nested configuration, so when the stator is energized, it generates a magnetic flux extending radially from the stator to the rotor. Therefore, the conductive windings in the stator are typically arranged perpendicular to the axis of rotation, generating a magnetic field oriented radially from the axis of rotation (along the rotor axis). In an axial flux motor, the conductive windings in the stator generate a magnetic field parallel to the axis of rotation, so the magnetic flux extends parallel to the axis of rotation (parallel to the rotor axis). In some applications, axial flux motors are ideal because they are relatively lighter than radial flux motors, generate increased power, and have a compact size. Therefore, in applications with size and weight constraints, such as electric vehicle drive motors, axial flux motors have a significant advantage over radial flux motors at the same speed.

[0091] In related technologies, the stator structure of an axial flux motor generally includes a stator assembly, a first end cover, and a second end cover. The stator assembly comprises an inner support, a stator, and an outer housing, which are sequentially nested radially from the inside to the outside. The stator includes a stator core and a stator winding wound around the stator core. The stator core has a structure that continuously surrounds the inner support. The first and second end covers are respectively disposed at both ends of the stator assembly along the axial direction. The first end cover, the inner housing, the second end cover, and the outer housing are sequentially and sealingly connected, collectively forming a cooling cavity, within which the stator core is located.

[0092] However, in the above scheme, the overall strength of the stator structure is poor, resulting in low reliability of the axial flux motor.

[0093] Based on this, embodiments of this application provide a new stator structure and an axial flux motor having the stator structure. The axial flux motor having the stator structure can be applied in vehicles to solve the above-mentioned technical problems.

[0094] The following, with reference to the accompanying drawings and using different embodiments as examples, provides a detailed description of the specific structure of the stator structure and the axial flux motor having the stator structure.

[0095] Reference Figure 1 and Figure 2 As shown, this application embodiment provides a stator structure 100, which can be applied in an axial flux motor. Specifically, see [link to relevant documentation]. Figure 3 As shown, the stator structure 100 may include at least: a stator assembly 110, a stator outer diameter support 120, and a stator inner diameter support 130 arranged coaxially. The stator outer diameter support 120 may be located on the outside of the stator assembly 110 along the radial direction of the stator assembly 110, and the stator inner diameter support 130 may be located on the inside of the stator assembly 110.

[0096] The stator assembly 110 can include a stator core 111 and at least two groups of armature windings 112, wherein the at least two groups of armature windings 112 can be spaced apart along a circumferential direction of the stator core 111, and the at least two groups of armature windings 112 are respectively wound on the stator core 111.

[0097] Continuing to refer to Figures 4 to 6 As shown, the stator structure 100 can further include at least two fixing members 140, which can be spaced apart along the circumferential direction of the stator core 111, wherein each fixing member 140 can be located between two adjacent groups of armature windings 112, and each fixing member 140 can pass through the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 along the radial direction of the stator core 111 to fix the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130.

[0098] Compared with the way of adopting inner and outer ring interference installation between the stator outer diameter support 120 and the stator core 111 and between the stator inner diameter support 130 and the stator core 111 in the prior art, the present embodiment sets multiple fixing members 140 in the circumferential direction of the stator core 111, and fixes the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 as a whole by passing through the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 along the radial direction of the stator core 111, which can improve the overall strength of the stator structure 100, thereby improving the overall reliability of the stator structure 100, and further improving the overall reliability of the axial flux motor. Moreover, since the fixing strength of the fixing member 140 to the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 is high, the coaxiality of the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 can be further ensured, thereby being more conducive to the mass production of the stator structure 100.

[0099] It should be noted that in the present embodiment, the radial direction of the stator assembly 110 refers to the direction along the diameter of the stator assembly 110, the circumferential direction of the stator assembly 110 refers to the direction along the outer peripheral wall of the stator assembly 110, and the axial direction of the stator assembly 110 refers to the direction along the central axis of the stator assembly 110.

[0100] In the embodiments of the present application, the outer circumferential wall of the stator core 111 can be provided with at least two first grooves 1111, and the at least two first grooves 1111 can be spaced apart along the circumferential direction of the stator core 111, wherein each first groove 1111 is used for inserting a fixing member 140. By providing at least two first grooves 1111 spaced apart along the circumferential direction of the stator core 111 on the outer circumferential wall of the stator core 111, and inserting the fixing member 140 into the first groove 1111, the functions of fixing the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 are achieved.

[0101] It should be noted that, as shown in Figure 4 and Figure 7 , in the embodiments of the present application, there can be two rows of first grooves 1111 spaced apart along the circumferential direction of the stator core 111, and specifically, the two rows of first grooves 1111 can be spaced apart in the axial direction of the stator core 111.

[0102] In some embodiments, as shown in Figure 5 and Figure 6 , the number of first grooves 1111 in each row can be four, and the four first grooves 1111 can be uniformly spaced apart along the circumferential direction of the stator core 111 on the outer circumferential wall of the stator core 111, and specifically, the projection of the four first grooves 1111 in one row on the stator core 111 can be spaced apart by 90° from the projection of the four first grooves 1111 in the other row on the stator core 111, and the fixing member 140 is inserted into the first groove 1111 along the radial direction of the stator core 111.

[0103] In addition, in order to further increase the structural stability, the two rows of first grooves 1111 can be relatively staggered. That is, the projection of the four first grooves 1111 in one row on the stator core 111 can not overlap with the projection of the four first grooves 1111 in the other row on the stator core 111. For example, as shown in Figures 5 to 7 , the projection of the four first grooves 1111 in one row on the stator core 111 can be spaced apart by 45° from the projection of the four first grooves 1111 in the other row on the stator core 111.

[0104] As shown in Figure 7 and Figure 8As shown, a plurality of second grooves 1112 can also be formed on the outer circumferential wall of the stator core 111, and the plurality of second grooves 1112 can be spaced apart along the circumferential direction of the stator core 111. The second grooves 1112 are arranged opposite to the first grooves 1111, and the second grooves 1112 can at least be used to accommodate the armature winding 112. By forming a plurality of second grooves 1112 spaced apart along the circumferential direction of the stator core 111 on the outer circumferential wall of the stator core 111, the second grooves 1112 can provide accommodation space for the armature winding 112. In addition, the second grooves 1112 are arranged opposite to the first grooves 1111, which can avoid interference between the first grooves 1111 and the second grooves 1112.

[0105] It can be understood that in the axial flux motor, for a smaller packaging structure, the armature winding 112 in the stator structure 100 can be an integrated structure.

[0106] Referring to Figure 7 As shown, in the embodiment of the present application, there can be two rows of second grooves 1112 spaced apart along the circumferential direction of the stator core 111. Specifically, the two rows of second grooves 1112 can be spaced apart in the axial direction of the stator core 111. The number of second grooves 1112 in each row can be a plurality, and the first grooves 1111 can be uniformly distributed between the two second grooves 1112.

[0107] As Figure 7 shown, in the embodiment of the present application, the second groove 1112 can be a stepped groove. Specifically, the stepped groove can include a first part 1112A and a second part 1112B connected to the first part 1112A, wherein the first part 1112A is relatively close to the outer surface of the stator core 111, and the second part 1112B is relatively far away from the outer surface of the stator core 111,

[0108] The aperture of the first part 1112A can be larger than the aperture of the second part 1112B, i.e., the slot width of the first part 1112A can be larger than the slot width of the second part 1112B. The first part 1112A can be used to accommodate the armature winding 112, and the second part 1112B can be used to accommodate the liquid (such as cooling liquid).

[0109] Referring to Figure 7 As shown, the slot width of the first part 1112A is greater than the slot width of the second part 1112B. When the armature winding 112 is placed in the first part 1112A, the armature winding 112 can be prevented from falling into the second part 1112B. In this way, the placement of the armature winding 112 and the flow of the liquid in the second part 1112B do not interfere with each other, and the process is simple and easy to implement.

[0110] In addition, the second groove 1112 can further be provided with at least one blocking portion at the slot position of the second groove 1112, so as to form a semi-open groove. The smaller the opening of the slot of the second groove 1112, the smaller the equivalent air gap, and the greater the magnetic field energy formed by the armature winding 112. Therefore, the blocking portion can enhance the electromagnetic performance, and is beneficial to the axial field motor 200 with the stator structure 100 to generate a larger torque and power.

[0111] It should be noted that in the embodiments of the present application, the liquid flowing in the stator structure 100 is generally cooling liquid, so as to play a cooling effect. For example, the liquid can be cooling oil, and the embodiments of the present application are not limited to the above examples.

[0112] By designing the second groove 1112 as a stepped groove including the first portion 1112A and the second portion 1112B, and stacking the first portion 1112A and the second portion 1112B in the extension direction (i.e., the depth direction) of the second groove 1112, the second portion 1112B close to the bottom of the second groove 1112 can be used for flowing liquid, and the first portion 1112A close to the slot of the second groove 1112 can be used for accommodating the armature winding 112. Alternatively, in some embodiments, each group of armature windings 112 can include a first sub-winding 1121A and a second sub-winding 1121B (see Figure 12 As shown, in the axial direction of the stator core 111, the first sub-winding 1121A and the second sub-winding 1121B can have a gap 1129 therebetween, which is used for accommodating liquid.

[0113] By designing each group of armature windings 112 to include the first sub-winding 1121A and the second sub-winding 1121B, the first sub-winding 1121A and the second sub-winding 1121B are stacked in the axial direction of the stator core 111, and the first sub-winding 1121A and the second sub-winding 1121B have the gap 1129 therebetween, which can be used for accommodating liquid. Since the power density of the axial flux motor is large, the axial flux motor generates a lot of heat during operation. Therefore, this design can increase the contact area between the armature winding 112 and the liquid, thereby effectively reducing the temperature rise of the armature winding 112, and greatly improving the heat dissipation effect of the axial flux motor.

[0114] Specifically, in actual application scenarios, referring to Figure 13As shown, each set of the armature winding 112 can include an armature winding slot portion 112A and an armature winding end portion 112B. After each set of the armature winding 112 is wired, the armature winding end portion 112B is separated from the middle along the axial direction of the stator core 111 by a certain gap 1129 by using a tool without affecting the armature winding slot portion 112A, so that each set of the armature winding 112 on both sides of the stator core 111 becomes a double-layer structure including a first sub-winding 1121A and a second sub-winding 1121B. In this way, liquid (i.e. cooling oil) can flow through the gap 1129 between the first sub-winding 1121A and the second sub-winding 1121B that are separated, so as to effectively reduce the temperature rise of the armature winding 112, especially the temperature rise at the armature winding end portion 112B.

[0115] It should be noted that when the armature winding end portion 112B is separated from the middle along the axial direction of the stator core 111, the operation is performed after the armature winding 112 is wired to the second groove 1112, so the arrangement of the wires in the armature winding 112 is not affected. In addition, the armature winding end portion 112B is separated from the middle along the axial direction of the stator core 111 by a certain gap 1129 by using a tool, and the gap 1129 is small, so the armature winding end portion 112B does not fit with the stator outer diameter support 120 and the stator inner diameter support 130, and the first sealing plate 150 and the second sealing plate 160. Moreover, the process is easy to operate and does not increase the manufacturing complexity of the stator structure 100. After the armature winding end portion 112B is separated from the middle along the axial direction of the stator core 111, the cooling oil can directly contact the center of the armature winding end portion 112B where heat is originally accumulated, thereby effectively reducing the temperature rise of the armature winding 112 and ensuring stable operation of the axial flux motor.

[0116] Referring to Figure 3 As shown, in the embodiment of the present application, the stator structure 100 can further include a first sealing plate 150 and a second sealing plate 160. The first sealing plate 150 and the second sealing plate 160 can be located on both sides of the stator assembly 110 along the axial direction of the stator assembly 110, and the first sealing plate 150 and the second sealing plate 160 are coaxially arranged with the stator assembly 110. In addition, in the embodiment of the present application, the first sealing plate 150 abuts against one side of the stator outer diameter support 120 and the stator inner diameter support 130, and the second sealing plate 160 abuts against the other side of the stator outer diameter support 120 and the stator inner diameter support 130.

[0117] By arranging the first sealing plate 150 and the second sealing plate 160 coaxially with the stator assembly 110 on both sides of the stator assembly 110, a space for accommodating liquid can be formed between the stator assembly 110 and the first sealing plate 150 and between the stator assembly 110 and the second sealing plate 160, respectively.

[0118] In some embodiments, as shown in Figure 3 The stator structure 100 can further include a plurality of stator outer diameter baffles 170, wherein the plurality of stator outer diameter baffles 170 can be spaced along the circumferential direction of the stator outer diameter support 120. Moreover, each stator outer diameter baffle 170 can be located between two adjacent groups of armature windings 112. By sealing the stator assembly 110 by the first sealing plate 150 and the second sealing plate 160 and adjusting the flow direction of the liquid by the stator outer diameter baffles 170 to control the oil path, direct cooling of the stator structure 100 is achieved, which can greatly enhance the cooling effect of the stator structure 100 while reducing the impact pressure of the liquid on the first sealing plate 150 and the second sealing plate 160.

[0119] It should be noted that the specific arrangement position of the plurality of stator outer diameter baffles 170 on the stator outer diameter support 120 can include but is not limited to the following possible implementation manners:

[0120] One possible implementation manner is that the plurality of stator outer diameter baffles 170 can be located in the space between the stator outer diameter support 120 and the first sealing plate 150.

[0121] Another possible implementation manner is that the plurality of stator outer diameter baffles 170 can be located in the space between the stator outer diameter support 120 and the second sealing plate 160.

[0122] Still another possible implementation manner is that part of the plurality of stator outer diameter baffles 170 can be located in the space between the stator outer diameter support 120 and the first sealing plate 150, and the remaining part of the plurality of stator outer diameter baffles 170 can be located in the space between the stator outer diameter support 120 and the second sealing plate 160.

[0123] By arranging the plurality of stator outer diameter baffles 170 on at least one side surface of the stator outer diameter support 120, and spacing the plurality of stator outer diameter baffles 170 along the circumferential direction of the stator outer diameter support 120, the stator outer diameter baffles 170 can block the flow of the liquid, which can reduce the flow speed of the liquid inside the stator structure 100, thereby increasing the flow time of the liquid inside the stator structure 100, and further reducing the temperature rise. In other words, the stator outer diameter baffles 170 can buffer the impact force of the liquid (such as the cooling medium) in a specific direction, while having a flow disturbance effect to enhance convective heat transfer and improve heat dissipation effect. In this way, the axial flux motor with the stator structure 100 can be ensured to be in a good cooling state, which is beneficial to the high power density design of the axial flux motor.

[0124] On the basis of the above-mentioned embodiments, referring to Figure 3As shown, each stator outer diameter baffle 170 can have an opening 171, and the two adjacent groups of armature windings 112 can be connected in communication through the opening 171. By providing the opening 171 on the stator outer diameter baffle 170, since each stator outer diameter baffle 170 is located between the two adjacent groups of armature windings 112, the two adjacent groups of armature windings 112 can be connected in communication through the opening 171, avoiding the problem that the armature winding 112 needs to cross the stator outer diameter baffle 170 to realize connection, resulting in a large span of the armature winding 112 and easy to pull. In addition, the two adjacent groups of armature windings 112 are separated by the stator outer diameter baffle 170 and connected in communication through the opening 171 on the stator outer diameter baffle 170, which can provide a placement space for the stator outer diameter baffle 170.

[0125] Specifically, in the embodiment of the present application, the number of stator outer diameter baffles 170 can be eight, as shown in the following figure. Figure 3 As shown, four stator outer diameter baffles 170 can be distributed on one side surface of the stator outer diameter support 120 along the circumferential direction of the stator outer diameter support 120, and the adjacent two stator outer diameter baffles 170 among the four stator outer diameter baffles 170 can be spaced apart by 90°. The other four stator outer diameter baffles 170 can be distributed on the other side surface of the stator outer diameter support 120 along the circumferential direction of the stator outer diameter support 120, and the adjacent two stator outer diameter baffles 170 among the four stator outer diameter baffles 170 can be spaced apart by 90°.

[0126] The more the number of stator outer diameter baffles 170, the better the role of blocking the flow of liquid, so that the flow speed of the liquid in the stator structure 100 can be more effectively reduced, thereby the flow time of the liquid in the stator structure 100 can be more effectively increased, and the role of further reducing the temperature rise can be played.

[0127] In addition, in a possible implementation, the projection of the four stator outer diameter baffles 170 on the one side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120 can at least partially not coincide with the projection of the four stator outer diameter baffles 170 on the other side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120.

[0128] It should be noted that at least partial non-coincidence means that the projection of the four stator outer diameter baffles 170 on the one side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120 can be completely non-coincident with the projection of the four stator outer diameter baffles 170 on the other side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120, or the projection of the four stator outer diameter baffles 170 on the one side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120 can only partially coincide with the projection of the four stator outer diameter baffles 170 on the other side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120, and the other part is non-coincident.

[0129] In other words, the projection of the four stator outer diameter baffles 170 on the one side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120 cannot completely coincide with the projection of the four stator outer diameter baffles 170 on the other side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120. If it is completely coincident, the mutual flow between the liquids on both sides of the stator outer diameter support 120 cannot be achieved.

[0130] Exemplarily, in some embodiments, as shown in Figure 14 the projection of the four stator outer diameter baffles 170 on the one side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120 can be different from the projection of the four stator outer diameter baffles 170 on the other side surface of the stator outer diameter support 120 along the axial direction of the stator outer diameter support 120 by 45° in the circumferential direction of the stator outer diameter support 120.

[0131] Moreover, the stator outer diameter baffles 170 divide the stator core 111 into four equal parts, which can control the oil path (i.e., the liquid in the stator structure 100) to form four parts, so that the flow of the liquid forms an S-shaped loop, thereby effectively increasing the contact area of the liquid and the armature winding 112 and improving the heat dissipation effect of the armature winding 112.

[0132] For the stator structure 100 with eight stator outer diameter baffles 170, the four stator outer diameter baffles 170 on each side divide the armature winding 112 on the side of the stator core 111 into four groups, and each side has an armature winding 112 every 90°, and the armature windings 112 on both sides are distributed with an interval of 45°.

[0133] As Figure 16 and Figure 17As shown, the stator core 111 is provided with a total of eight armature windings 112. The eight armature windings 112 are the first armature winding 1121, the second armature winding 1122, the third armature winding 1123, the fourth armature winding 1124, the fifth armature winding 1125, the sixth armature winding 1126, the seventh armature winding 1127, and the eighth armature winding 1128. The first armature winding 1121, the second armature winding 1122, the third armature winding 1123, and the fourth armature winding 1124 are located on one side surface of the stator outer diameter support 120, while the fifth armature winding 1125, the sixth armature winding 1126, the seventh armature winding 1127, and the eighth armature winding 1128 are located on the other side surface of the stator outer diameter support 120.

[0134] Understandably, the four sets of armature windings 112 (i.e., the first armature winding 1121, the second armature winding 1122, the third armature winding 1123, and the fourth armature winding 1124) located on one side surface of the stator outer diameter support 120 are axially misaligned by 90° with the four sets of armature windings 112 (i.e., the fifth armature winding 1125, the sixth armature winding 1126, the seventh armature winding 1127, and the eighth armature winding 1128) located on the other side surface of the stator outer diameter support 120. This allows the oil passages to be axially misaligned, which helps to enable the cooling oil to flow between the two layers of armature windings 112 in the axial direction.

[0135] It should be noted that the specific number of armature windings 112 can be flexibly set according to the needs of the actual application scenario and the number of stator outer diameter baffles 170, etc., and this application embodiment does not limit this. For example, in this application embodiment, the number of armature windings 112 can also be two, four, six, or ten, etc. This application embodiment divides the armature windings 112 into several modules, and each armature winding 112 is not connected to each other, so as to avoid the space for installing the stator outer diameter baffles 170. The stator outer diameter baffles 170 and the armature windings 112 do not interfere with each other, making the installation simple and easy to operate.

[0136] like Figure 9 , Figure 10 as well as Figure 11 The axial field motor shown is a four-pole motor. In some other embodiments, taking the number of armature windings 112 as N as an example, when the number of armature windings 112 is N, the axial field motor is an N / 2 pole pair motor. In this case, the stator outer diameter baffle 170 can be designed to have N / 2 armature windings 112 on one side, and there will be no additional jumper wires between two adjacent armature windings 112 except for the lead wires connecting them.

[0137] In addition, the mechanical angle difference of 45° between the two axial sides of the stator outer diameter barrier 170 and the armature winding 112 can also be extended to other motor schemes with different pole pairs, and specifically, for a motor with N / 2 pole pairs, the mechanical angle difference between the two axial sides of the armature winding 112 can be 360° / P or 360° / 2P, and in this case, the phase difference between the two axial sides of the armature winding 112 in the magnetic field is 0° or 180°.

[0138] Referring to Figure 3 In the embodiment of the present application, the stator structure 100 can further include a plurality of stator inner diameter barriers 180, wherein the plurality of stator inner diameter barriers 180 are spaced along the circumferential direction of the stator inner diameter support 130.

[0139] It should be noted that the specific arrangement position of the plurality of stator inner diameter barriers 180 on the stator inner diameter support 130 can include but is not limited to the following possible implementation manners:

[0140] One possible implementation manner is that the plurality of stator inner diameter barriers 180 can be located in the space between the stator inner diameter support 130 and the first sealing plate 150.

[0141] Another possible implementation manner is that the plurality of stator inner diameter barriers 180 can be located in the space between the stator inner diameter support 130 and the second sealing plate 160.

[0142] Still another possible implementation manner is that part of the plurality of stator inner diameter barriers 180 can be located in the space between the stator inner diameter support 130 and the first sealing plate 150, and the remaining part of the plurality of stator inner diameter barriers 180 can be located in the space between the stator inner diameter support 130 and the second sealing plate 160.

[0143] By arranging the plurality of stator inner diameter barriers 180 on at least one side surface of the stator inner diameter support 130 and spacing the plurality of stator inner diameter barriers 180 along the circumferential direction of the stator inner diameter support 130, the stator inner diameter barriers 180 can block the flow of liquid, so that the flow speed of the liquid inside the stator structure 100 can be reduced, thereby increasing the flow time of the liquid inside the stator structure 100 and further reducing the temperature rise.

[0144] Specifically, in the embodiment of the present application, the number of stator inner diameter barriers 180 is eight, as shown in Figure 3As shown, four stator inner diameter baffles 180 are spaced apart on one side surface of the stator inner diameter support 130 along the circumferential direction, and adjacent stator inner diameter baffles 180 are spaced 90° apart. Another four stator inner diameter baffles 180 are spaced apart on the other side surface of the stator inner diameter support 130 along the circumferential direction, and adjacent stator inner diameter baffles 180 are spaced 90° apart.

[0145] The more stator inner diameter baffles 180 are set, the better they can block the flow of liquid. This can more effectively reduce the flow speed of liquid inside the stator structure 100, thereby more effectively increasing the flow time of liquid inside the stator structure 100 and further reducing the temperature rise.

[0146] In one possible implementation, the projections of the four stator inner diameter baffles 180 on one side surface of the stator inner diameter support 130 along the axial direction of the stator inner diameter support 130 may at least partially not coincide with the projections of the four stator inner diameter baffles 180 on the other side surface of the stator inner diameter support 130 along the axial direction of the stator inner diameter support 130.

[0147] For example, such as Figure 3 As shown, the projections of the four stator inner diameter baffles 180 on one side surface of the stator inner diameter support 130 along the axial direction of the stator inner diameter support 130 and the projections of the four stator inner diameter baffles 180 on the other side surface of the stator inner diameter support 130 along the axial direction of the stator inner diameter support 130 can differ by 45° in the circumferential direction of the stator inner diameter support 130.

[0148] It is understood that, in this embodiment of the application, the stator outer diameter support 120 may also be provided with multiple first through holes (e.g., Figure 14 and Figure 15 The stator includes a first through hole 121, a second through hole 122, a third through hole 123, or a fourth through hole 124. The first through hole is used to connect the two sides of the stator outer diameter support 120. By providing multiple first through holes on the stator outer diameter support 120, it is possible to connect the space for containing liquid formed between the stator assembly 110 and the first sealing plate 150 with the space for containing liquid formed between the stator assembly 110 and the second sealing plate 160. That is, the liquid can flow in the axial direction of the stator structure 100, thereby increasing the flow area and flow range of the liquid inside the stator structure 100.

[0149] Similarly, multiple second through holes (e.g.) can also be provided on the stator inner diameter support 130. Figure 14 and Figure 15 The fifth through hole 131, the sixth through hole 132, the seventh through hole 133, or the eighth through hole 134 are provided in the stator. The second through hole is used to connect the two sides of the stator inner diameter support 130. By providing multiple first through holes on the stator inner diameter support 130, it is also possible to connect the space for containing liquid formed between the stator assembly 110 and the first sealing plate 150 with the space for containing liquid formed between the stator assembly 110 and the second sealing plate 160, so that the liquid can flow in the axial direction of the stator structure 100, thereby increasing the flow area and flow range of the liquid inside the stator structure 100.

[0150] Of course, it is easy to understand that in this embodiment of the application, the first through hole and the second through hole may not be provided. In this case, the two sides of the stator outer diameter support 120 and the two sides of the stator inner diameter support 130 cannot be connected, and the liquid flows independently only on one side of the stator assembly 110.

[0151] Furthermore, in this embodiment, the stator structure 100 may further include an outer shell 190, wherein the outer shell 190 can be sleeved on the outer peripheral wall of the stator outer diameter support 120, and the outer shell 190 can be fixed to the stator outer diameter support 120. In this way, the outer shell 190 can protect the stator outer diameter support 120 and the stator assembly 110.

[0152] It is understood that, in the embodiments of this application, the stator core 111 is fixed to the outer casing 190 by the stator outer diameter bracket 120 and the stator inner diameter bracket 130.

[0153] like Figure 16 and Figure 17 As shown, the outer casing 190 may have at least one liquid inlet 191 and at least one liquid outlet 192, and both the liquid inlet 191 and the liquid outlet 192 may be connected to the second groove 1112. By providing at least one liquid inlet 191 and at least one liquid outlet 192 on the outer casing 190 respectively connected to the second groove 1112, liquid enters through the liquid inlet 191 into the space between the stator outer diameter support 120 and the first sealing plate 150, and between the stator outer diameter support 120 and the second sealing plate 160, then enters through the second groove 1112 into the space between the stator inner diameter support 130 and the first sealing plate 150, and between the stator inner diameter support 130 and the second sealing plate 160, and finally flows out of the stator structure 100 through the liquid outlet 192.

[0154] In a possible implementation, the liquid inlet 191 and the liquid outlet 192 can be arranged opposite to each other in the vertical direction, and the liquid inlet 191 can be arranged higher than the liquid outlet 192. By arranging the liquid inlet 191 and the liquid outlet 192 opposite to each other in the vertical direction, and arranging the liquid inlet 191 higher than the liquid outlet 192, the liquid can flow out of the liquid outlet 192 by gravity after entering the stator structure 100 through the liquid inlet 191, which can reduce the hydraulic pressure requirement in the stator structure 100, and the liquid can flow well in the stator structure 100 by gravity. In addition, the liquid flows by gravity, which can also reduce the pressure on the first sealing plate 150 and the second sealing plate 160, and further improve the overall sealing performance of the stator structure 100.

[0155] In addition, it should be noted that, in the embodiment of the present application, the stator core 111, the stator outer diameter support 120, and the stator inner diameter support 130 can be integrally formed by overall casting.

[0156] In a possible implementation, as shown in Figure 14 the stator core 111, the stator outer diameter support 120, the stator inner diameter support 130, the at least two fixing members 140, the plurality of stator outer diameter partition plates 170, and the plurality of stator inner diameter partition plates 180 can be integrally formed by overall casting. In this way, the fixing member 140, the stator outer diameter support 120, and the stator inner diameter support 130 do not need to be connected by screw fixing, and the stator outer diameter partition plate 170, the stator outer diameter support 120, and the stator inner diameter support 130 also do not need to be connected by screw fixing, and the stator inner diameter partition plate 180, the stator outer diameter support 120, and the stator inner diameter support 130 also do not need to be connected by screw fixing. That is, the present application can cancel the screw holes arranged on the stator outer diameter support 120 and the stator inner diameter support 130, and does not need to increase the screws, which to some extent simplifies the assembly of the stator structure 100.

[0157] Next, the cooling mode of the stator structure 100 provided by the present application, i.e., the flow mode of the liquid (i.e., the cooling oil) in the stator structure 100, will be described in detail in different scenarios.

[0158] Scenario one

[0159] As shown in Figure 18 and Figure 19As shown, the stator outer diameter support 120, the stator inner diameter support 130 and the stator core 111 divide the stator structure 100 into two layers along its axial direction. In this scenario, the stator outer diameter support 120 is provided with a plurality of first through holes, which connect the two sides of the stator outer diameter support 120. The stator inner diameter support 130 is provided with a plurality of second through holes, which connect the two sides of the stator inner diameter support 130. At this time, the cooling oil can pass through between the two layers of the stator structure 100.

[0160] With the stator outer diameter support 120 and the stator inner diameter support 130 as the plane, the stator outer diameter baffle 170 and the stator inner diameter baffle 180 are clamped between the outer shell 190 and the stator core 111 to plan the oil path. Then, the armature winding 112 is wired from the notch position of the second groove 1112 and is immersed in paint to fill the gap. In addition, the upper and lower end faces of the armature winding end portion 112B do not match the stator outer diameter support 120 and the stator inner diameter support 130, as well as the first sealing plate 150 and the second sealing plate 160, but leave a certain gap for the cooling oil to pass through.

[0161] The flow of the cooling oil is described in detail. As shown in Figure 18 and Figure 19 The liquid inlet 191 is located in the upper layer of the stator structure 100, and the liquid outlet 192 is located in the lower layer of the stator structure 100. The cooling oil enters from the liquid inlet 191 and is divided into two paths by the first stator outer diameter baffle 1711. Part of the cooling oil in one path enters the lower layer of the stator structure 100 from the first sub-through hole 121, and part of the cooling oil in the other path enters the lower layer of the stator structure 100 from the second sub-through hole 122.

[0162] The first stator inner diameter baffle 1811 is also used to maintain the oil path into two paths. Another part of the cooling oil in the above two paths, which does not flow out of the first sub-through hole 121 and the second sub-through hole 122, flows into the fifth sub-through hole 131 or the sixth sub-through hole 132 after flowing through the gap between the armature winding 112, the stator core 111 and the outer shell 190 in the upper layer of the stator structure 100, encountering resistance from the second stator outer diameter baffle 1712, the third stator outer diameter baffle 1713, the second stator inner diameter baffle 1812 and the third stator inner diameter baffle 1813, thereby entering the lower layer of the stator structure 100.

[0163] The cooling oil from the lower layer of the stator structure 100 enters the first sub through hole 121 and the second sub through hole 122, and after passing through the gap between the armature winding 112, the stator core 111 and the outer shell 190 in the lower part of the stator structure 100, it encounters the fifth stator outer diameter baffle 1715 and the sixth stator outer diameter baffle 1716, at this time the cooling oil flows towards the first sub through hole 121 and the second sub through hole 122, and converges with the cooling oil flowing out of the first sub through hole 121 and the second sub through hole 122, and continues to flow to the gap of other parts of the lower layer of the stator structure 100, and when encountering the seventh stator outer diameter baffle 1717, the eighth stator outer diameter baffle 1718, the fifth stator inner diameter baffle 1815 and the sixth stator inner diameter baffle 1816, it flows into the third sub through hole 123 and the fourth sub through hole 124, and the cooling oil reenters the upper layer of the stator structure 100, and after passing through other gaps in the upper part of the stator structure 100, it encounters the fourth stator outer diameter baffle 1714 and the fourth stator inner diameter baffle 1814 to flow into the seventh sub through hole 133 or the eighth sub through hole 134, and the cooling oil reenters the lower layer of the stator structure 100 and flows out of the liquid outlet 192 after passing through the remaining gap in the lower part of the stator structure 100.

[0164] In this scenario, by opening the first sub through hole 121, the second sub through hole 122, the third sub through hole 123 and the fourth sub through hole 124 on the stator outer diameter support 120, and opening the fifth sub through hole 131, the sixth sub through hole 132, the seventh sub through hole 133 and the eighth sub through hole 134 on the stator inner diameter support 130, the cooling oil can pass through between the upper and lower layers of the stator structure 100, and the oil path is planned by respectively clamping the stator outer diameter baffle 170 and the stator inner diameter baffle 180 between the outer shell 190 and the stator core 111 in the upper and lower parts of the stator structure 100.

[0165] Through the above design, the oil path formed under the structure can have better coverage in the interior of the stator structure 100, and can effectively reduce the proportion of space that is difficult to flow. Moreover, the cooling oil can flow from the liquid inlet 191 to the liquid outlet 192 by relying on its own gravity, and the area of counter-gravity flow is small, so it will not cause too much extrusion to the first sealing plate 150 and the second sealing plate 160 to form a bulge and affect the performance of the axial flux motor. The overall S-shaped oil path of the stator structure 100 can also enhance the turbulence of the fluid to improve the cooling efficiency. In addition, when the axial flux motor is placed inclined due to the application occasion, within a certain range of inclination angle, the cooling oil is divided into two paths by the stator outer diameter baffle 170 and the stator inner diameter baffle 180, which can reduce the influence of gravity inclination on the flow and heat dissipation performance of the cooling oil.

[0166] Scenario two

[0167] As Figure 20 andFigure 21 As shown, the stator outer diameter support 120, the stator inner diameter support 130 and the stator core 111 divide the stator structure 100 into two layers along its axial direction. Different from the above scenario, in this scenario, the first through hole is not provided on the stator outer diameter support 120, i.e. the two sides of the stator outer diameter support 120 are not communicated. The second through hole is also not provided on the stator inner diameter support 130, i.e. the two sides of the stator inner diameter support 130 are not communicated. At this time, the structure 100 is completely divided into two independent layers along its axial direction in a closed state.

[0168] The stator outer diameter baffle 170 and the stator inner diameter baffle 180 are clamped between the outer shell 190 and the stator core 111 to plan the oil path with the stator outer diameter support 120 and the stator inner diameter support 130 as a plane. Then, the armature winding 112 is wired from the notch position of the second groove 1112 and is immersed in paint to fill the gap. In addition, the upper and lower end faces of the armature winding end portion 112B are not in contact with the stator outer diameter support 120 and the stator inner diameter support 130 and the first sealing plate 150 and the second sealing plate 160, but a certain gap is left for the cooling oil to pass through.

[0169] The flow of the cooling oil is specifically described. As shown in Figure 20 and Figure 21 , the first liquid inlet 1911 and the first liquid outlet 1921 are located in the upper layer of the stator structure 100, and the second liquid inlet 1912 and the second liquid outlet 1922 are located in the lower layer of the stator structure 100. Taking the upper layer of the stator structure 100 as an example, the cooling oil enters from the first liquid inlet 1911 and is divided into two paths by the first stator outer diameter baffle 1711, and the first stator inner diameter baffle 1811 is used to maintain the oil path as two paths.

[0170] In addition, the upper layer of the stator structure 100 is divided into a first region 1001 and a second region 1002 as shown in Figure 20 and Figure 21 At this time, part of the cooling oil will directly flow through the second groove 1112 of the stator core 111 from the gap outside the stator core 111 in the first region 1001, flow into the gap inside the stator core 111 in the first region 1001, and then directly flow into the gap outside and inside the stator core 111 in the second region 1002 to the first liquid outlet 1921. Another part of the cooling oil will flow to the second stator outer diameter baffle 1712 and the third stator outer diameter baffle 1713 through the gap outside the stator core 111 in the first region 1001, and then flow into the gap inside the stator core 111 in the first region 1001, and then flow into the gap outside and inside the stator core 111 in the second region 1002 to the first liquid outlet 1921, respectively.

[0171] The lower oil passage of the stator structure 100 is similar to the upper oil passage of the stator structure 100. The cooling oil enters from the second inlet 1912 and is divided into two paths by the fifth stator outer diameter baffle 1715. The fifth stator inner diameter baffle 1815 is used to maintain the oil passage into two paths. Part of the cooling oil directly flows through the second groove 1112 of the stator core 111 in the gap on the outside of the stator core 111 in the first area 1001, flows into the gap on the inside of the stator core 111 in the first area 1001, and then directly flows into the gap on the outside and the inside of the stator core 111 in the second area 1002 to the second outlet 1922. The other part of the cooling oil flows to the sixth stator outer diameter baffle 1716 and the seventh stator outer diameter baffle 1717 through the gap on the outside of the stator core 111 in the first area 1001, is blocked and then flows into the gap on the inside of the stator core 111 in the first area 1001, and then flows into the gap on the outside and the inside of the stator core 111 in the second area 1002 to the second outlet 1922, respectively.

[0172] In this scenario, the first through hole and the second through hole are not arranged on the stator outer diameter support 120 and the stator inner diameter support 130, so that the stator structure 100 is completely divided into two independent upper and lower layers. The stator outer diameter baffle 170 and the stator inner diameter baffle 180 are clamped between the outer shell 190 and the stator core 111 of the upper and lower parts of the stator structure 100 to plan the oil passage.

[0173] Through the above design, the flow space of the cooling oil in each layer and each path of the oil passage formed by the structure is small, the flow direction is simple, and the fluid space is good in smoothness. The flow time of the cooling oil is short, the heating time of the cooling oil by the heating components is short, and the volume of the heating components heating the cooling oil in each part is also small, so that the temperature difference of the cooling oil at the inlet and outlet can be reduced, and the weakening of the heat dissipation capacity caused by the heating of the cooling oil can be reduced. Similarly, the cooling oil can flow to the first outlet 1921 and the second outlet 1922 from the first inlet 1911 and the second inlet 1912 by relying on its own gravity, the anti-gravity flow area is small, and the first sealing plate 150 and the second sealing plate 160 will not be squeezed too much to form a bulge to affect the performance of the axial flux motor. In addition, the division of the cooling oil into two paths by the stator outer diameter baffle 170 and the stator inner diameter baffle 180 can reduce the influence of gravity inclination on the flow and heat dissipation performance of the cooling oil.

[0174] On the basis of the above embodiment, the embodiment of the present application further provides an axial flux motor, which can include at least one rotor structure (not shown in the figure) and at least one stator structure 100 described above, wherein the stator structure 100 and the rotor structure are alternately arranged along the axial direction of the axial flux motor.

[0175] The axial flux motor provided by the embodiment of the present application can include a stator structure 100, the stator structure 100 is provided with at least two fixing members 140 distributed along the circumferential direction of the stator core 111, each fixing member 140 is arranged between two adjacent groups of armature windings 112, and each fixing member 140 passes through the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 along the radial direction of the stator core 111 to fix the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 as a whole. Compared with the way of installing the stator outer diameter support 120 and the stator core 111 and the stator inner diameter support 130 and the stator core 111 by means of inner and outer ring interference in the prior art, the embodiment of the present application sets multiple fixing members 140 in the circumferential direction of the stator core 111, and fixes the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 as a whole by means of the multiple fixing members 140 passing through the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 along the radial direction of the stator core 111, which can improve the overall strength of the stator structure 100, thereby improving the overall reliability of the stator structure 100, and further improving the overall reliability of the axial flux motor. Moreover, since the fixing strength of the fixing member 140 to the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 is high, the coaxiality of the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 can be further ensured, thereby being more conducive to the mass production of the stator structure 100.

[0176] That is, by setting the above stator structure 100 in the axial flux motor, the reliability of the axial flux motor is high due to the high reliability of the stator structure 100 in the axial flux motor, so that the use performance of the axial flux motor can be optimized.

[0177] In addition, it can be understood that in the embodiment of the present application, the axial flux motor can be a double-rotor single-stator axial flux motor, that is, two rotor structures are respectively located on the two sides of the one stator structure 100.

[0178] The embodiment of the present application also provides a power assembly, which can at least include the above-mentioned axial flux motor.

[0179] The power assembly provided by the embodiment of the present application comprises at least an axial flux motor, and the axial flux motor comprises at least a stator structure, and at least two fixing members are arranged in the stator structure and are spaced apart along the circumferential direction of the stator core. Each fixing member is arranged between two adjacent groups of armature windings, and passes through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core, so as to fix the stator outer diameter support, the stator core and the stator inner diameter support as a whole. Compared with the way of installing the stator outer diameter support and the stator core and the stator inner diameter support by means of inner and outer ring interference in the prior art, the embodiment of the present application arranges multiple fixing members in the circumferential direction of the stator core, and fixes the stator outer diameter support, the stator core and the stator inner diameter support as a whole by means of the multiple fixing members passing through the stator outer diameter support, the stator core and the stator inner diameter support along the radial direction of the stator core, so as to improve the overall strength of the stator structure, thereby improving the overall reliability of the stator structure, and further improving the overall reliability of the axial flux motor. Moreover, the fixing strength of the fixing members on the stator outer diameter support, the stator core and the stator inner diameter support is high, so as to further ensure the coaxiality of the stator outer diameter support, the stator core and the stator inner diameter support, thereby being more conducive to the mass production of the stator structure.

[0180] That is, by arranging the above axial flux motor in the power assembly, the reliability of the axial flux motor is high due to the high reliability of the stator structure in the axial flux motor, thereby making the overall reliability of the power assembly high.

[0181] In addition, the embodiment of the present application also provides a vehicle, which can at least comprise: front wheels, rear wheels, a vehicle body and the above axial flux motor. The vehicle body can be connected between the front wheels and the rear wheels, and the axial flux motor can be installed on the vehicle body.

[0182] It can be understood that the axial flux motor is used to provide power for the vehicle, and the axial flux motor in the present application has a compact structure, high structural strength, high torque density and high power density. The compact structure can save the size of the axial flux motor, and when applied in the vehicle, the internal space of the vehicle can be saved. The vehicle can comprise a car and the like. In other embodiments, the vehicle can comprise an electric vehicle or a special operation vehicle. The electric vehicle can comprise a two-wheeled, three-wheeled or four-wheeled electric vehicle. The special operation vehicle can comprise various vehicles with specific functions, such as an engineering rescue vehicle, a water spraying vehicle, a sewage suction vehicle, a cement mixing vehicle, a hoisting vehicle or a medical vehicle.

[0183] The vehicle provided by the embodiment of the present application can at least include an axial flux motor, the axial flux motor can at least include a stator structure 100, the stator structure 100 is provided with at least two fixing pieces 140 distributed along the circumferential direction of the stator core 111, each fixing piece 140 is arranged between two adjacent groups of armature windings 112, and each fixing piece 140 passes through the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 along the radial direction of the stator core 111 to fix the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 as a whole. Compared with the way that the stator outer diameter support 120 and the stator core 111 and the stator inner diameter support 130 and the stator core 111 are installed by adopting the inner and outer ring interference in the prior art, the embodiment of the present application is provided with a plurality of fixing pieces 140 in the circumferential direction of the stator core 111, and the fixing pieces 140 pass through the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 along the radial direction of the stator core 111 to fix the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 as a whole, which can improve the overall strength of the stator structure 100, thereby improving the overall reliability of the stator structure 100, and further improving the overall reliability of the axial flux motor. Moreover, the fixing strength of the fixing pieces 140 to the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130 is high, which can further ensure the coaxiality of the stator outer diameter support 120, the stator core 111 and the stator inner diameter support 130, thereby being more conducive to the mass production of the stator structure 100.

[0184] That is, by arranging the above axial flux motor in the vehicle, the reliability of the axial flux motor is high due to the high reliability of the stator structure 100 in the axial flux motor, thereby making the overall reliability of the vehicle high, which can optimize the use performance and safety performance of the vehicle.

[0185] In the description of the embodiment of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms “mounting”, “connection” and “connection” should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiment of the present application can be understood according to the specific circumstances.

[0186] In the embodiment of the present application or the device or element implied by the embodiment of the present application must have a specific orientation, and therefore cannot be understood as a limitation of the embodiment of the present application. In the description of the embodiment of the present application, the meaning of “a plurality of” is two or more, unless otherwise specified.

[0187] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, and above-described drawings, if any, are used to distinguish between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is to be construed to cover the embodiments of the present application whether or not the embodiments are described using the same. It is also to be understood that the use of the terms "including", "comprising", or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items not specifically listed. Furthermore, the terms "comprise", "comprising", "include", "including", "contain", "containing", "have", "having", or variants thereof, are intended to be open-ended transitional phrases, terms, or words that ensure that at least the specified features are included, but that other features not specifically recited are also within the scope of the application.

[0188] Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present application, but not to limit the same. Although the above-described embodiments of the present application are explained in detail, those skilled in the art should understand that the technical solutions recorded in the above-described embodiments can be modified, or some or all of the technical features can be replaced equivalently. The modifications or replacements do not make the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A stator structure, characterized in that, At least including: The stator assembly, stator outer diameter support, and stator inner diameter support are coaxially arranged. Along the radial direction of the stator assembly, the stator outer diameter bracket is located on the outside of the stator assembly, and the stator inner diameter bracket is located on the inside of the stator assembly; The stator assembly includes a stator core and at least two sets of armature windings. The at least two sets of armature windings are distributed at intervals along the circumferential direction of the stator core and are respectively wound on the stator core. Two rotor structures are located on both sides of the stator structure. At least two fixing members are provided, which are spaced apart along the circumferential direction of the stator core. Each fixing member is located between two adjacent sets of armature windings, and each fixing member passes through the stator outer diameter bracket, the stator core, and the stator inner diameter bracket along the radial direction of the stator core to fix the stator outer diameter bracket, the stator core, and the stator inner diameter bracket. At least two first grooves are formed on the outer peripheral wall of the stator core. The at least two first grooves are spaced apart along the circumferential direction of the stator core. Each first groove is used to insert one of the fixing members. Two rows of first grooves are spaced apart in the axial direction of the stator core. The two rows of first grooves are staggered relative to each other along the circumferential direction of the stator core.

2. The stator structure according to claim 1, characterized in that, The stator core has a plurality of second grooves on its outer peripheral wall, and the plurality of second grooves are spaced apart along the circumferential direction of the stator core; the second grooves are offset from the first grooves. The second groove is at least used to accommodate the armature winding.

3. The stator structure according to claim 2, characterized in that, The second groove is a stepped groove; the stepped groove includes: a first part and a second part connected to the first part; The first part is close to the outer surface of the stator core, the second part is far from the outer surface of the stator core, and the aperture of the first part is larger than the aperture of the second part; The first part is used to accommodate the armature winding, and the second part is used to contain the liquid.

4. The stator structure according to claim 2, characterized in that, Each armature winding group includes: a first sub-winding and a second sub-winding; In the axial direction of the stator core, there is a gap between the first sub-winding and the second sub-winding, the gap being used to contain liquid.

5. The stator structure according to any one of claims 2-4, characterized in that, Also includes: First sealing plate and second sealing plate; Along the axial direction of the stator assembly, the first sealing plate and the second sealing plate are located on both sides of the stator assembly and are coaxially arranged with the stator assembly; The first sealing plate abuts against one side of the stator outer diameter bracket and the stator inner diameter bracket, and the second sealing plate abuts against the other side of the stator outer diameter bracket and the stator inner diameter bracket.

6. The stator structure according to claim 5, characterized in that, Also includes: Multiple stator outer diameter baffles; the multiple stator outer diameter baffles are spaced apart along the circumferential direction of the stator outer diameter support, and each stator outer diameter baffle is located between two adjacent sets of armature windings; Multiple stator outer diameter baffles are located in the space between the stator outer diameter bracket and the first sealing plate; Alternatively, the plurality of stator outer diameter baffles are located in the space between the stator outer diameter bracket and the second sealing plate; Alternatively, a portion of the plurality of stator outer diameter baffles may be located in the space between the stator outer diameter support and the first sealing plate, while the remaining portion of the plurality of stator outer diameter baffles may be located in the space between the stator outer diameter support and the second sealing plate.

7. The stator structure according to claim 6, characterized in that, Each of the stator outer diameter baffles has an opening through which two adjacent sets of armature windings are connected.

8. The stator structure according to claim 6 or 7, characterized in that, The number of stator outer diameter baffles is eight; The four stator outer diameter baffles are distributed at intervals along the circumferential direction of the stator outer diameter bracket on one side surface of the stator outer diameter bracket, and the stator outer diameter baffles are spaced 90° apart from each other. The other four stator outer diameter baffles are distributed at intervals along the circumferential direction of the stator outer diameter bracket on the other side surface of the stator outer diameter bracket, and the stator outer diameter baffles are spaced 90° apart from each other.

9. The stator structure according to claim 8, characterized in that, The projections of the four stator outer diameter baffles located on one side surface of the stator outer diameter bracket along the axial direction of the stator outer diameter bracket do not at least partially coincide with the projections of the four stator outer diameter baffles located on the other side surface of the stator outer diameter bracket along the axial direction of the stator outer diameter bracket.

10. The stator structure according to claim 9, characterized in that, The projections of the four stator outer diameter baffles located on one side surface of the stator outer diameter bracket along the axial direction of the stator outer diameter bracket differ by 45° from the projections of the four stator outer diameter baffles located on the other side surface of the stator outer diameter bracket along the axial direction of the stator outer diameter bracket in the circumferential direction of the stator outer diameter bracket.

11. The stator structure according to any one of claims 6-10, characterized in that, Also includes: Multiple stator inner diameter baffles; the multiple stator inner diameter baffles are spaced apart along the circumferential direction of the stator inner diameter support; The plurality of stator inner diameter baffles are located in the space between the stator inner diameter bracket and the first sealing plate; Alternatively, the plurality of stator inner diameter baffles are located in the space between the stator inner diameter bracket and the second sealing plate; Alternatively, a portion of the plurality of stator inner diameter baffles may be located in the space between the stator inner diameter support and the first sealing plate, while the remaining portion of the plurality of stator inner diameter baffles may be located in the space between the stator inner diameter support and the second sealing plate.

12. The stator structure according to claim 11, characterized in that, The number of stator inner diameter baffles is eight; The four stator inner diameter baffles are distributed at intervals along the circumferential direction of the stator inner diameter bracket on one side surface of the stator inner diameter bracket, and the interval between two adjacent stator inner diameter baffles is 90°. The other four stator inner diameter baffles are distributed at intervals along the circumferential direction of the stator inner diameter bracket on the other side surface of the stator inner diameter bracket, and the interval between two adjacent stator inner diameter baffles is 90°.

13. The stator structure according to claim 12, characterized in that, The projections of the four stator inner diameter baffles located on one side surface of the stator inner diameter bracket along the axial direction of the stator inner diameter bracket do not at least partially coincide with the projections of the four stator inner diameter baffles located on the other side surface of the stator inner diameter bracket along the axial direction of the stator inner diameter bracket.

14. The stator structure according to claim 13, characterized in that, The projections of the four stator inner diameter baffles located on one side surface of the stator inner diameter bracket along the axial direction of the stator inner diameter bracket differ by 45° from the projections of the four stator inner diameter baffles located on the other side surface of the stator inner diameter bracket along the axial direction of the stator inner diameter bracket in the circumferential direction of the stator inner diameter bracket.

15. The stator structure according to any one of claims 2-14, characterized in that, The stator outer diameter support is provided with a plurality of first through holes, which are used to connect the two sides of the stator outer diameter support.

16. The stator structure according to any one of claims 2-15, characterized in that, The stator inner diameter support is provided with a plurality of second through holes, which are used to connect the two sides of the stator inner diameter support.

17. The stator structure according to any one of claims 2-16, characterized in that, Also includes: The outer casing is fitted onto the outer peripheral wall of the stator outer diameter bracket, and the outer casing is fixed to the stator outer diameter bracket.

18. The stator structure according to claim 17, characterized in that, The outer casing is provided with at least one liquid inlet and at least one liquid outlet; Furthermore, both the liquid inlet and the liquid outlet are connected to the second groove.

19. The stator structure according to claim 18, characterized in that, The inlet and the outlet are arranged opposite each other in the vertical direction; Furthermore, the liquid inlet is positioned higher than the liquid outlet.

20. The stator structure according to any one of claims 1-19, characterized in that, The stator core, the stator outer diameter support, and the stator inner diameter support are integrally cast.

21. The stator structure according to any one of claims 11-14, characterized in that, The stator core, the stator outer diameter support, the stator inner diameter support, the at least two fixing components, the plurality of stator outer diameter baffles, and the plurality of stator inner diameter baffles are all integrally cast.

22. An axial flux motor, characterized in that, include: At least one rotor structure and at least one stator structure as described in any one of claims 1-21 above; The stator structure and the rotor structure are arranged alternately along the axial direction of the axial flux motor.

23. A powertrain, characterized in that, The powertrain includes the axial flux motor as described in claim 22.

24. A vehicle, characterized in that, include: The front wheel, the rear wheel, the vehicle body, and the axial flux motor as described in claim 22; The vehicle body is connected between the front wheel and the rear wheel, and the axial flux motor is mounted on the vehicle body.

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