Motor, stator and electric device thereof

Abstract

The embodiment of the present application provides a motor and a stator thereof and an electric device. The stator includes a stator core and a stator winding arranged on the stator core, the inner wall of the stator core is provided with a plurality of winding slots, and the stator winding includes a conductor inserted in the plurality of winding slots. The stator winding includes a plurality of phase windings, and each phase winding includes a first branch and a second branch.

Description

Technical Field

[0001] The present application relates to the technical field of power devices, and more specifically, to a motor and a stator thereof and an electrical device. Background Art

[0002] With the development of the new energy vehicle industry, the development of its drive motor is also tending towards high voltage, high speed, integration, platformization and miniaturization.

[0003] At present, how to reduce the voltage drop inside the motor and reduce the internal energy loss is one of the research goals in this field. Summary of the invention

[0004] The present application provides a motor and a stator thereof, which can reduce the voltage drop of the internal winding of the motor and reduce the internal energy loss of the motor.

[0005] In a first aspect, an embodiment of the present application provides a stator of a motor, including a stator core and a stator winding arranged on the stator core, wherein the inner wall of the stator core is provided with a plurality of winding grooves, and the stator winding includes conductors inserted in the plurality of winding grooves.

[0006] The conductors in each winding slot are arranged in n layers, where n is a positive even number; along the direction from the bottom of the winding slot to the slot opening of the winding slot, the n layers of conductors are recorded as L1 layer, L2 layer, ... and L n layer.

[0007] The stator winding includes a plurality of phase windings, each phase winding includes a plurality of pole phase groups; each pole phase group of the phase winding includes a first region, a second region and a third region, the second region and the third region are respectively located on both sides of the first region; the conductor located in the first region is L1 layer to L n layer, the conductor located in the second region is L n / 2+1 Layer to L n The conductors in the third area are L1 to L n / 2 layer.

[0008] Each phase winding includes a first branch and a second branch. The first branch includes 4k conductors connected in series, where k is a positive integer. The 4k conductors of the first branch are denoted by A1, ..., A 2k ...and A 4k The second branch includes 4k conductors connected in series. The 4k conductors of the second branch are denoted as B1, ..., B 2k ...and B 4k .

[0009] A1 to A 2k , B1 to B 2k Distributed in the first area; A 2k+1 To A 4k Part of it is distributed in the second area, A2k+1 To A 4k The rest of B is distributed in the third area; 2k+1 To B 4k Part of B is distributed in the second area. 2k+1 To B 4k The remainder is distributed in the third area.

[0010] In the technical solution of the embodiment of the present application, the first half of the conductors in the first branch and the second branch are distributed in the first area, and the second half of the conductors are distributed in the second area and the third area, which can reduce the maximum voltage drop between adjacent out-of-phase conductors and the maximum voltage drop between adjacent in-phase conductors, improve the insulation reliability of the stator winding, reduce the internal loss of the motor, and improve the energy conversion efficiency of the motor. At the same time, the above structure constitutes a short-distance winding, which can reduce winding harmonics, suppress torque pulsation, improve noise vibration, and improve efficiency.

[0011] In some embodiments, A 2k+1 To A 3k Distributed in the second area, A 3k+1 To A 4k Distributed in the third area; B 2k+1 To B 3k Distributed in the third area, B 3k+1 To B 4k Distributed in the second area. By distributing the first branch in the first area, the second area and the third area in sequence, and distributing the second branch in the first area, the third area and the second area in sequence, the maximum voltage drop between adjacent heterophase conductors can be reduced, the insulation reliability of the stator winding can be improved, the internal loss of the motor can be reduced, and the energy conversion efficiency of the motor can be improved. At the same time, the above structure constitutes a short-distance winding, which can reduce winding harmonics, suppress torque pulsation, improve noise and vibration, and improve efficiency.

[0012] In some embodiments, A1 and B1 are located in the same winding slot. The inlet ends of the two branches are arranged in the same winding slot, which can facilitate connection with external devices such as busbars and improve the efficiency of stator installation.

[0013] In some embodiments, A1 is the L1 layer conductor in the winding slot, and B1 is the L n The inlet ends of the first branch and the second branch are respectively arranged at the bottom layer and the opening layer of the same winding slot to facilitate the connection of the busbar.

[0014] In some embodiments, A 4k L in the winding slot n The conductor of the layer; B 4k L in the winding slot nThe outgoing wire ends of the first branch and the second branch are respectively arranged at the bottom layer and the opening layer of the same winding slot, so as to facilitate the connection of the busbar.

[0015] In some embodiments, the first branch includes a first positive lead connected to A1 and a first positive lead connected to A2. 4K The second branch includes a second positive lead connected to B1 and a second positive lead connected to B 4K The positive lead and the negative lead can extend out of the winding groove, which improves the convenience of welding the inlet and outlet ends and facilitates the connection of external components with the first branch and the second branch.

[0016] In some embodiments, the first branch includes a first single-conductor connector and a plurality of first double-conductor connectors, the first single-conductor connector includes one conductor, and each first double-conductor connector includes two conductors. The first branch of the embodiment of the present application uses a combination of multiple connectors, which can make the winding method of the first branch more flexible.

[0017] In some embodiments, there are two first single-conductor connectors, one first single-conductor connector includes A1, and the other first single-conductor connector includes A 4k The two first single conductor plug-ins can be used as an incoming conductor and an outgoing conductor respectively, so as to facilitate the connection of the first branch with external components.

[0018] In some embodiments, the plurality of first dual-conductor connectors include a first connector, a second connector, and a third connector; the span of the two conductors of the first connector is equal to the pole pitch, the span of the two conductors of the second connector is less than the pole pitch, and the span of the two conductors of the third connector is greater than the pole pitch. Providing connectors with different spans can adapt to the connection between conductors with different spans and to different conductor connection methods.

[0019] In some embodiments, A 2k and A 2k+1 A is the two conductors of the third connector; 3k and A 3k+1 The two conductors of the second connector are connected to each other. In the first branch, when the first area is connected to the second area, the third connector is used for long-distance connection, and when the second area is connected to the third area, the second connector is used for short-distance connection. The above structure can improve the efficiency of conductor plug-in installation.

[0020] In some embodiments, the second branch includes a second single-conductor connector and a plurality of second double-conductor connectors, the second single-conductor connector includes one conductor, and each second double-conductor connector includes two conductors; there are two second single-conductor connectors, one second single-conductor connector includes B1, and the other first single-conductor connector includes B 4k; The plurality of second dual-conductor connectors include a fourth connector, a fifth connector and a sixth connector; the span of the two conductors of the fourth connector is equal to the pole pitch, the span of the two conductors of the sixth connector is smaller than that of the fifth connector, and the span of the two conductors of the fifth connector is smaller than the pole pitch.

[0021] In the second branch, the second single-conductor connector can facilitate the welding of the second positive lead and the second negative lead, and the second double-conductor connector can be respectively arranged in the two winding slots to reduce the occupied space, making the structure of the stator more compact. The two second single-conductor plug-ins can be used as the incoming conductor and the outgoing conductor respectively, facilitating the connection of the second branch with the external busbar. The connectors with different spans can adapt to the connection between conductors with different spans and different conductor connection methods.

[0022] In some embodiments, B 2k and B 2k+1 The two conductors of the fifth connector; B 3k and B 3k+1 These are the two conductors of the sixth connector.

[0023] In the second branch, when bridging from the first area to the third area, a short-distance bridging is performed through the fifth connector, and when bridging between the second area and the third area, a short-distance bridging is performed through the sixth connector; the above structure can improve the efficiency of conductor plug-in installation.

[0024] In some embodiments, the stator winding includes three phase windings, and the three phase windings are connected in star connection or in delta connection.

[0025] In some embodiments, the winding slots are a multiple of twelve.

[0026] In some embodiments, the number of winding slots is 48, n is 8, and the number of poles of the stator is 8.

[0027] In a second aspect, an embodiment of the present application provides a motor, comprising the stator in any of the above embodiments.

[0028] In a third aspect, an embodiment of the present application provides an electrical device, comprising the motor in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0030] Figure 1A schematic structural diagram of a stator of a motor provided in some embodiments of the present application;

[0031] Figure 2 A schematic cross-sectional view of a stator provided in some embodiments of the present application;

[0032] Figure 3 for Figure 2 An enlarged schematic diagram at box A;

[0033] Figure 4 A schematic diagram of the distribution of the first area, the second area and the third area provided in some embodiments of the present application;

[0034] Figure 5 A schematic diagram of pole-phase groups of phase windings of a stator winding of a stator provided in some embodiments of the present application;

[0035] Figure 6 A schematic structural diagram of a first single-conductor connector of a stator provided in some embodiments of the present application;

[0036] Figure 7 A schematic structural diagram of a first dual-conductor connector of a stator provided in some embodiments of the present application;

[0037] Figure 8 A schematic structural diagram of a second single-conductor connector of a stator provided in some embodiments of the present application;

[0038] Fig. 9 A schematic diagram of the structure of the second double-conductor connector of the stator provided in some embodiments of the present application

[0039] Fig.10 A schematic diagram of a phase winding of a stator provided in some embodiments of the present application;

[0040] Fig.11 A schematic diagram of three phase windings of a stator provided in some embodiments of the present application;

[0041] Fig.12 A schematic diagram of the connection of phase windings of a stator winding of a stator provided in some embodiments of the present application;

[0042] Fig.13 A schematic diagram of the connection of phase windings of a stator winding of a stator provided in some other embodiments of the present application;

[0043] Fig.14 A schematic diagram of the connection of phase windings of a stator winding of a stator provided in some other embodiments of the present application;

[0044] Fig.15 A schematic diagram of the connection of phase windings of a stator winding of a stator provided in some further embodiments of the present application.

[0045] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0048] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0052] The term "plurality" used in the present application refers to two or more (including two).

[0053] In the drive motor of new energy vehicles, in order to improve the slot fill rate of the motor, improve the power density and torque density, multiple layers of conductors can be set in the winding slots of the stator winding of the motor, and the conductors are connected to form the stator winding. The stator winding is usually in the form of full-pitch winding or short-pitch winding.

[0054] The inventors found that in the related art, the harmonic content of the full-pitch winding is high, and the voltage drop between the same-phase conductors in the slot is large, which reduces the insulation reliability and the energy conversion efficiency of the motor. The same-phase voltage drop and the out-of-phase voltage drop in the short-pitch winding slot are both large, the insulation reliability is low, and the internal loss of the motor is large.

[0055] Based on the above reasons, the inventors have studied and designed a stator, which changes the winding method of the stator winding to effectively reduce the voltage drop between two adjacent out-of-phase conductors in the same winding slot and the voltage drop between the same-phase conductors in the same winding slot, thereby improving the insulation reliability of the stator winding.

[0056] For ease of understanding, the professional terms appearing in this application are explained below.

[0057] Stator: refers to the stationary part of the motor, whose function is to generate a rotating magnetic field.

[0058] Rotor: refers to the rotating part in the motor, which is used to realize the conversion of electrical energy into mechanical energy.

[0059] Span: refers to the distance between the two sides of the same element in the motor winding on the armature surface, usually expressed by the number of winding slots opened on the stator core.

[0060] Pole pair number P: Pole pair number is abbreviated as pole pair number. The magnetic poles formed after the motor winding is energized appear in the form of N poles and S poles in pairs. The total number of magnetic poles is 2P.

[0061] Pole pitch: Pole pitch refers to the distance occupied by each magnetic pole of the motor along the circumferential surface of the air gap. The pole pitch can be expressed by the number of winding slots of the stator core. For example, the pole pitch is Z / 2P; Z is the total number of winding slots of the stator core.

[0062] Pole-phase group: In an AC motor, multiple coils belonging to the same phase winding under one pole pitch are connected in series into a group, which is called a pole-phase group, also called a coil group. The current direction and electromagnetic effect of each coil in the pole-phase group are the same, and these coils jointly generate the magnetic poles in the phase winding.

[0063] Phase winding: A phase winding is a set of windings connected in series or parallel by one or more parallel branches in a specified way. The conductors in the phase winding usually span multiple pole pitches, and the coils are interconnected to form a whole.

[0064] Figure 1 A schematic structural diagram of a stator of a motor provided in some embodiments of the present application; Figure 2 A schematic cross-sectional view of a stator provided in some embodiments of the present application; Figure 3 for Figure 2 An enlarged schematic diagram at box A; Figure 4 A schematic diagram of the distribution of the first area, the second area and the third area provided in some embodiments of the present application; Figure 5 A schematic diagram of pole-phase groups of phase windings of a stator winding of a stator provided in some embodiments of the present application.

[0065] like Figure 1 and Figure 2 As shown, some embodiments of the present application provide a stator 10 of a motor, the stator 10 includes a stator core 101 and a stator winding 102 disposed on the stator core 101. The inner wall of the stator core 101 is provided with a plurality of winding grooves 1011. The stator winding 102 includes a conductor 1021 inserted in the plurality of winding grooves 1021. Please refer to Figure 3 , the conductors 1021 in each winding slot 1011 are arranged in n layers, where n is a positive even number. Along the direction from the bottom of the winding slot 1011 to the slot opening of the winding slot 1011, the n layers of conductors 1021 are recorded as L1 layer, L2 layer, ... and L n layer.

[0066] Please refer to Figure 4 The stator winding 102 includes a plurality of phase windings, each of which includes a plurality of pole phase groups; each pole phase group of the phase winding includes a first region 301, a second region 302 and a third region 303, the second region 302 and the third region 303 are respectively located on both sides of the first region 301; the conductor 1021 located in the first region 301 is L1 layer to L n The conductor 1021 located in the second region 302 is L n / 2+1 Layer to L n The conductor 1021 located in the third region is L1 to L n / 2 layer.

[0067] The phase winding includes a first branch U1 and a second branch U2. The first branch U1 includes 4k conductors 1021 connected in series, where k is a positive integer. The 4k conductors 1021 of the first branch U1 are denoted as A1, ..., A2. 2k ...and A 4k The second branch U2 includes 4k conductors 1021 connected in series, and the 4k conductors 1021 of the second branch U2 are denoted as B1, ..., B 2k ...and B 4k .

[0068] A1 to A 2k , B1 to B 2k Distributed in the first area 301; A 2k+1 To A 4k A portion of the conductor 1021 is distributed in the second region 302, A 2k+1 To A 4k The remaining conductor 1021 is distributed in the third area 303; 2k+1 To B 4k A portion of the conductor 1021 is distributed in the second region 302, B 2k+1 To B 4k The remaining portion of the conductor 1021 is distributed in the third region 303 .

[0069] For example, A 2k+1 To A 3k Distributed in the second area 302, A 3k To A 4k Distributed in the third area 303. 2k+1 To B 3k Distributed in the third area 303, B 3k To B 4k Distributed in the second area 302.

[0070] For example, the number n of conductors 1021 in the winding slots 1011 may be 2, 4, 6, 8, 16 or 32. The number of winding slots 1011 may be determined according to the number of phase windings in the stator 10, and adapted to different voltage and power ranges in accordance with the design and use range of the windings. Figure 6 As shown, n is 8. Exemplarily, the layers L1 to L8 may also be respectively recorded as layer a, layer b, layer c, layer d, layer e, layer f, layer g and layer h.

[0071] The embodiment of the present application does not limit the shape of the conductor 1021. For example, the cross-section of the conductor 1021 can be circular, rectangular, elliptical or racetrack-shaped. Optionally, the cross-section of the conductor 1021 is rectangular, which can increase the cross-sectional area of ​​the conductor 1021 and can be adapted to the rectangular wire slot of the iron core to improve the slot fill rate of the stator iron core; the rectangular conductor 1021 can also be called a flat wire conductor.

[0072] Exemplarily, the plurality of winding slots 1011 are arranged at intervals along the circumference of the stator core 101. Optionally, the plurality of winding slots 1011 are evenly arranged along the circumference of the stator core 101; in other words, in the circumferential direction, the plurality of winding slots 1011 are arranged at equal intervals.

[0073] The stator winding includes a plurality of phase windings, and the number of phase windings may be 2, 3, 4, or 5. Of course, the number of phase windings may also be greater than 5. The stator of the embodiment of the present application is applicable to motors with different numbers of phases and can be adapted to different voltage and power ranges.

[0074] The number of pole-phase groups of the phase winding is a positive even number. The first region 301, the second region 302 and the third region 303 of each pole-phase group are distributed in three different winding slots 1011. Exemplarily, the second region 302 is located on one side of the first region 301 in the clockwise direction, and the third region 302 is located on one side of the first region 301 in the counterclockwise direction; alternatively, the second region 302 is located on one side of the first region 301 in the counterclockwise direction, and the third region 303 is located on one side of the first region 301 in the clockwise direction.

[0075] Each phase winding may include multiple branches. The branches of the phase winding may also be referred to as parallel branches. The number of branches of the phase winding may be any integer to expand the scope of use of the winding design and adapt to different voltage and power ranges. Exemplarily, the phase winding of the embodiment of the present application includes a first branch U1 and a second branch U2 in parallel; the first branch U1 may be one or more, and the second branch U2 may be one or more.

[0076] For example, from the positive electrode to the negative electrode of the first branch U1, A1, ..., A 2k ...and A 4k From the positive electrode to the negative electrode of the second branch U2, B1, ..., B 2k ...and B 4k Connect in series.

[0077] The inventors have noticed that in the same winding slot 1011, the voltage drop between adjacent same-phase conductors 1021 is related to the difference between the numbers of the conductors 1021. For example, the adjacent same-phase conductors 1021 in the same winding slot 1011 are A x and B y , 1≤x≤4k, 1≤y≤4k; the larger the value of |xy| is, the greater the voltage drop between adjacent same-phase conductors 1021 is, and the higher the insulation requirements of the motor for the stator winding are.

[0078] In the application embodiment, the numbers of the conductors 1021 distributed in the first area 301 do not exceed 2k, and the difference in the numbers of adjacent same-phase conductors 1021 will also be less than 2k. This can reduce the maximum voltage drop between adjacent same-phase conductors 1021 in the first area 301, thereby improving the insulation reliability of the stator winding, reducing the internal loss of the motor, and improving the energy conversion efficiency of the motor.

[0079] The conductors 1021 distributed in the second area 302 and the third area 303 are both numbered more than 2k, and the difference in the numbers of adjacent same-phase conductors 1021 will also be less than 2k. This can reduce the maximum voltage drop between adjacent same-phase conductors 1021 in the second area 302 and the maximum voltage drop between adjacent same-phase conductors 1021 in the third area 303, thereby improving the insulation reliability of the stator winding, reducing the internal loss of the motor, and improving the energy conversion efficiency of the motor.

[0080] In the embodiment of the present application, the second area 302 occupies only a part of the winding slot 1011, and the third area 303 occupies only a part of the winding slot 1011, so the phase winding adopts the form of short-distance winding. Short-distance winding can reduce winding harmonics and improve motor torque pulsation and noise vibration.

[0081] Since the phase windings in the embodiment of the present application are in the form of short-distance windings, adjacent conductors of different phases may exist in some winding slots 1011. For example, in the same winding slot 1011, the second region 302 of one phase winding and the third region 303 of another phase winding may be distributed.

[0082] The inventors have noticed that in the same winding slot 1011, the voltage drop between adjacent out-of-phase conductors is related to the sum of the numbers of the conductors 1021. For example, the adjacent in-phase conductors in the same winding slot 1011 are A x and A y (It may also be B x and B y , or possibly A x and B y ), 1≤x≤4k, 1≤y≤4k; the smaller the value of x+y is, the greater the voltage drop between adjacent out-of-phase conductors is, and the higher the insulation requirement of the electrode to the stator winding is.

[0083] In an embodiment of the present application, the conductors distributed in the second area 302 and the third area 303 are both numbered more than 2k, so the conductors in the same winding slot 1011 and belonging to different phase windings are all numbered more than 2k, and the sum of the numbers of adjacent out-of-phase conductors will also be greater than 4k, thereby reducing the maximum voltage drop between adjacent out-of-phase conductors, improving the insulation reliability of the stator winding, reducing the internal loss of the motor, and improving the energy conversion efficiency of the motor.

[0084] In some embodiments of the present application, the winding slots 1011 extend along the axial direction of the stator core 101 and penetrate the stator core 101 along the axial direction of the stator core 101 .

[0085] In the embodiment of the present application, the number of the winding slots 1011 is 12·M, where M is a positive integer.

[0086] In some embodiments of the present application, the stator winding may include three phase windings, the three phase windings are respectively a first phase winding, a second phase winding and a third phase winding. Exemplarily, the first phase winding is a U phase winding, the second phase winding is a V phase winding, and the third phase winding is a W phase winding.

[0087] In some embodiments of the present application, A 2k+1 To A 3k Distributed in the second area 302, A 3k+1 To A 4k Distributed in the third area 303; B 2k+1 To B 3k Distributed in the third area 303, B 3k+1 To B 4k Distributed in the second area 302.

[0088] The present application can allow the second region 302 and the third region 303 to both have conductors 1021 with numbers greater than 3k, which can increase the sum of the numbers of adjacent out-of-phase conductors, thereby reducing the maximum voltage drop between adjacent out-of-phase conductors, improving the insulation reliability of the stator winding, reducing the internal loss of the motor, and improving the energy conversion efficiency of the motor.

[0089] In some embodiments of the present application, the first branch U1 is wound in the form of wave winding in the order of the first region 301 of the plurality of pole phase groups, the second region 302 of the plurality of pole phase groups, and the third region 303 of the plurality of pole phase groups. The second branch U2 is wound in the form of wave winding in the order of the first region 301 of the plurality of pole phase groups, the third region 303 of the plurality of pole phase groups, and the second region 302 of the plurality of pole phase groups.

[0090] By winding the first branch U1 and the second branch U2 in the form of wave winding, the connecting wires between the conductors 1021 can be reduced and the winding process of the stator winding can be simplified.

[0091] In some embodiments of the present application, A1 and B1 are located in the same winding slot 1011. The inlet ends of the two branches are arranged in the same winding slot 1011, which can be easily connected with external components such as busbars, thereby improving the efficiency of stator installation.

[0092] In some embodiments of the present application, A1 is the L1 layer conductor 1021 in the winding slot 1011, and B1 is the Ln Layer conductor 1021. The inlet ends of the first branch U1 and the second branch U2 are respectively arranged at the bottom layer and the opening layer of the same winding slot 1011 to facilitate the connection of the busbar.

[0093] In some embodiments of the present application, A 4k L in the winding slot 1011 n Conductor 1021 of layer; B 4k L in the winding slot n Layer conductor 1021. The outgoing wire ends of the first branch U1 and the second branch U2 are respectively arranged at the bottom layer and the opening layer of the same winding slot 1011, so as to facilitate the connection of the busbar.

[0094] Figure 5 Schematic diagram of the structure of a phase winding in an embodiment of the present application, such as Figure 5 As shown, in some embodiments of the present application, the first branch U1 includes a first positive lead U1+ connected to A1 and a first positive lead U1+ connected to A1. 4K The second branch U2 includes a second positive lead U2+ connected to B1 and a second positive lead U2+ connected to B 4K The first positive lead U1+, the first negative lead U1-, the second positive lead U2+ and the second negative lead U2- can extend out of the winding groove 1011, which can facilitate the connection of external components with the first branch U1 and the second branch U2.

[0095] In some embodiments of the present application, the first branch U1 includes a plurality of connectors connected in series, each of which includes at least one conductor 1021 .

[0096] like Figure 6 as well as Figure 7 As shown, in some embodiments of the present application, the first branch U1 includes a first single-conductor connector 1031 and a plurality of first double-conductor connectors 1022, the first single-conductor connector 1031 includes one conductor 1021, and each first double-conductor connector 1022 includes two conductors 1021. The conductor 1021 of the first single-conductor connector 1031 and the conductor 1021 of the first double-conductor connector 1022 are different conductors in the first branch U1.

[0097] The first branch circuit U1 of the embodiment of the present application adopts a combination of various connectors, which can make the winding method of the first branch circuit U1 more flexible.

[0098] In some embodiments, the first two-conductor connector 1022 may include a connecting portion 1028 that connects the two conductors 1021 .

[0099] In some embodiments, the two conductors 1021 may be connected by welding. For example, when the span between the two conductors 1021 is small, for example, when the spacing between the two conductors 1021 is less than or equal to 2 winding slots, the two conductors 1021 may be connected by direct welding.

[0100] In some embodiments, the first dual-conductor connector 1022 further includes two extensions, one extending from the end of one conductor away from the connection portion, and the other extending from the end of the other conductor away from the connection portion. The two extensions extend out of the winding groove 1011 to facilitate connection with other connectors.

[0101] Exemplarily, the first dual-conductor connector 1022 may be a hairpin coil. Before being inserted into the winding slot 1011, the first dual-conductor connector 1022 may include two straight edges, the two straight edges are inserted into the winding slot 1011 through one end of the stator core, the portions of the two straight edges accommodated in the winding slot 1011 respectively form two conductors 1021, and the portions of the two straight edges extending through the other end of the stator core form two extensions.

[0102] The two extensions are respectively a first extension 1029 and a second extension 1030, and the first extension 1029 and the second extension 1030 are both arranged at the welding end of the stator winding. After the dual-conductor connector is inserted into the stator core, the first extension 1029 and the second extension 1030 can be bent to facilitate welding of the first extension 1029 and the second extension 1030 with other connectors.

[0103] In some embodiments of the present application, there are two first single-conductor connectors 1031, one first single-conductor connector 1031 includes A1, and the other first single-conductor connector 1031 includes A 4k The two first single conductor plug-ins 1031 can be used as an incoming conductor and an outgoing conductor respectively, so as to facilitate the connection of the first branch U1 with a busbar of an external component.

[0104] In some embodiments of the present application, the plurality of first dual-conductor connectors 1022 include a first connector, a second connector, and a third connector. The span of the two conductors of the first connector is equal to the pole distance, the span of the two conductors 1021 of the second connector is less than the pole distance, and the span of the two conductors 1021 of the third connector is greater than the pole distance.

[0105] The plurality of first dual-conductor connectors 1022 can be divided into multiple types according to different spans. The first connector is a first dual-conductor connector 1022 with a span equal to the pole pitch. The second connector can be a first dual-conductor connector 1022 with a span less than the pole pitch. The third connector can be a first dual-conductor connector 1022 with a span greater than the pole pitch.

[0106] The connectors 1022 with different spans can be used to connect conductors 1021 with different spans and to connect conductors in different ways. Figure 6 As shown in , the difference lies in that the span between the two conductors 1021 in different connectors is different.

[0107] In some embodiments of the present application, the number of the third connector is one, and the third connector includes A 2k and A 2k+1 The number of the second plug connector is one, and the second plug connector includes A 3k and A 3k+1 The number of the first connector is multiple, including the first connectors connected to A2 to A 2k-1 , A 2k+2 To A 3k-1 and A 3k+2 To A 4k There are two adjacent conductors 1021 therebetween, and a plurality of connection portions 1028 connected between the two adjacent conductors 1021 .

[0108] In the first branch U1, when bridging from the first area 301 to the second area 302, a long-distance bridging is performed through the third connector, and when bridging between the second area 302 and the third area 303, a short-distance bridging is performed through the second connector; the above structure can improve the efficiency of conductor plug-in installation.

[0109] like Figure 8 and Fig. 9 As shown, in some embodiments of the present application, the second branch U2 includes a second single-conductor connector 1041 and a plurality of second double-conductor connectors 1042, the second single-conductor connector 1041 includes one conductor 1021, and each second double-conductor connector 1042 includes two conductors 1021. The conductor 1021 of the second single-conductor connector 1041 and the conductor 1021 of the second double-conductor connector 1042 are different conductors in the second branch U2.

[0110] In some embodiments of the present application, there are two second single-conductor connectors 1041, one of which includes B1 and the other includes B2. 4k .

[0111] In some embodiments of the present application, the second dual-conductor connector includes a fourth connector, a fifth connector and a sixth connector; the span of the two conductors 1021 of the fourth connector is equal to the pole pitch, the span of the two conductors 1021 of the sixth connector is smaller than that of the fifth connector, and the span of the two conductors 1021 of the fifth connector is smaller than the pole pitch.

[0112] It can be understood that the structures of the fourth connector, the fifth connector and the sixth connector are all as follows: Figure 8 As shown in , the difference lies in that the span between the two conductors 1021 in different connectors is different.

[0113] The plurality of second dual-conductor connectors 1042 can be divided into multiple types according to different spans. The fourth connector is a second dual-conductor connector 1042 with a span equal to the pole pitch. The fifth connector can be a second dual-conductor connector 1042 with a span less than the pole pitch. The third connector can be a second dual-conductor connector 1042 with a span less than the span of the fifth connector.

[0114] In some embodiments of the present application, the number of the fifth connector is one, and the fifth connector includes B 2k and B 2k+1 The number of the sixth plug connector is one, and the sixth plug connector includes B 3k and B 3k+1 The number of the fourth connector is multiple, including the connectors connected to B2 to B 2k-1 , B 2k+2 To B 3k-1 and B 3k+2 To B 4k There are two adjacent conductors 1021 therebetween, and a plurality of connection portions 1028 connected between the two adjacent conductors 1021 .

[0115] In the second branch U2, the second single-conductor connector 1041 can facilitate the welding of the second positive lead U2+ and the second negative lead U2-, and the second double-conductor connector 1042 can be respectively arranged in the two winding slots 1011 to reduce the occupied space, making the structure of the stator 10 more compact. The two second single-conductor plug-ins 1041 can be used as the incoming conductor and the outgoing conductor respectively, so as to facilitate the connection of the second branch U2 with the external bus. The connectors with different spans can adapt to the connection between the conductors 1021 with different spans and adapt to different connection methods of the conductors 1021.

[0116] In some embodiments of the present application, B 2k and B 2k+1 The two conductors of the fifth connector; B 3kand B 3k+1 These are two conductors 1021 of the sixth connector.

[0117] In the second branch U2, when bridging from the first area 301 to the third area 303, a short-distance bridging is performed through the fifth connector, and when bridging between the second area 302 and the third area 303, a short-distance bridging is performed through the sixth connector; the above structure can improve the efficiency of conductor plug-in installation.

[0118] In some embodiments of the present application, the stator winding 102 includes three phase windings, and the three phase windings are connected in star connection or delta connection. Optionally, the three phase windings are connected in star connection.

[0119] In some embodiments of the present application, the number of the winding slots 1011 is a multiple of 12.

[0120] In some embodiments of the present application, the number of winding slots 1011 is 48, n is 8, and the number of poles of the stator 10 is 8. Each magnetic pole corresponds to 6 winding slots 1011 .

[0121] Fig.10 A schematic diagram of a phase winding of a stator 10 provided in some embodiments of the present application. For example, Fig.10 The U-phase winding is shown. The stator winding of the present application is described in detail below by taking the U-phase winding as an example.

[0122] like Fig.10 As shown, the U-phase winding includes a plurality of branches, two of which are a first branch U1 and a second branch U2.

[0123] For ease of understanding, the first table shows the first branch U1 , the second table shows the second branch U2 , and the third table shows the U-phase winding.

[0124] exist Fig.10 In the figure, U1+ represents the first positive lead of the first branch U1, and U1- represents the first negative lead of the first branch U1; U2+ represents the second positive lead of the second branch U2, and U2- represents the second negative lead of the second branch U2.

[0125] N and S respectively represent two magnetic poles of the stator 10. Exemplarily, the stator is provided with 8 magnetic poles, that is, 4 magnetic pole pairs.

[0126] The stator core is provided with a plurality of winding slots 1011, and the plurality of winding slots 1011 are indicated by a row of numbers under the N pole and the S pole. For example, the stator core 101 is provided with 48 winding slots 1011. Fig.10 In the figure, the 48 winding slots are represented by a row of numbers under the N pole and the S pole, i.e., 1 to 48. Each magnetic pole corresponds to 6 winding slots 1011.

[0127] Each winding slot 1011 contains a multilayer conductor 1021. Figure 7 In the embodiment, each winding slot 1011 contains eight conductors 1021. The eight conductors 1021 are located at layers a, b, c, d, e, f, g and h, respectively.

[0128] The branch U1 includes 64 conductors 1021 connected in sequence. Fig.10 In the table, the 64 conductors 1021 are represented by 64 serial numbers distributed in the table. The 64 conductors 1021 are connected in sequence according to the serial numbers. Fig.10 The solid arrows in the figure represent the connection mode of the 64 conductors 1021 at the welding end, and the dotted arrows represent the connection mode of the conductors 1021 at the plug-in end.

[0129] The first positive lead U1+ is connected to the No. 1 conductor 1021 , and the first negative lead U1 − is connected to the No. 64 conductor 1021 .

[0130] In some embodiments of the present application, conductors 1-32 of the first branch U1 are connected in series in sequence. Conductors 1, 3, 5, and 7 are all a-layer conductors 1021, and conductors 1021 of 2, 4, 6, and 8 are all b-layer conductors 1021. Conductors 1021 of 9, 11, 13, and 15 are all c-layer conductors 1021. Conductors 10, 12, 14, and 16 are all d-layer conductors 1021. Conductors 1021 of 17, 19, 21, and 23 are all e-layer conductors 1021. Conductors 1021 of 18, 20, 22, and 24 are all f-layer conductors 1021. Conductors 1021 of 25, 27, 29, and 31 are all g-layer conductors 1021. Conductors 1021 of 26, 28, 30, and 32 are all h-layer conductors 1021.

[0131] In some embodiments of the present application, conductors 1021 of No. 33-64 of the first branch U1 are connected in series in sequence. Conductors 1021 of No. 33, 35, 37, and 39 are all h-layer conductors 1021, and conductors 1021 of No. 34, 36, 38, and 40 are all g-layer conductors 1021. Conductors 1021 of No. 41, 43, 45, and 47 are all f-layer conductors 1021. Conductors 1021 of No. 42, 44, 46, and 48 are all e-layer conductors 1021. Conductors 1021 of No. 49, 51, 53, and 55 are all d-layer conductors 1021. Conductors 1021 of No. 50, 52, 54, and 56 are all c-layer conductors 1021. Conductors 1021 of No. 57, 59, 61, and 63 are all b-layer conductors 1021. Conductors 1021 of No. 58, 60, 62, and 64 are all a-layer conductors 1021.

[0132] In some embodiments of the present application, the conductor No. 32 and the conductor No. 33 1021 of the first branch U1 are both h-layer conductors. The conductors 1021 connected in the same layer can balance the slot potential of the branch and reduce the circulating current loss between the branches.

[0133] In some embodiments of the present application, the No. 1 conductor 1021 connected to the first positive lead U1+ is located in the No. 14 winding groove, and the No. 64 conductor 1021 connected to the first negative lead U1- is located in the No. 9 winding groove.

[0134] In some embodiments of the present application, the No. 1 conductor 1021 connected to the first positive lead U1+ and the No. 64 conductor 1021 connected to the first negative lead U1- are both a-layer conductors 1021. This embodiment is conducive to the arrangement of the busbar, and facilitates the connection of the first positive lead U1+ and the first negative lead U1- with the busbar and other components.

[0135] In some embodiments of the present application, the stator includes 8 magnetic poles, and correspondingly, the phase winding includes 8 pole-phase groups. The 64 conductors of the first branch U1 are distributed in 8 pole-phase groups, which can reduce the branch potential imbalance caused by rotor eccentricity.

[0136] In some embodiments of the present application, the span between the conductor 1021 of the first positive lead U1+ connected to the first branch U1 and the conductor 1021 of the second positive lead U2+ connected to the second branch U2 is less than or equal to the pole pitch. The embodiments of the present application can reduce the spacing between the inlet terminals of the two branches, facilitate the connection of the inlet terminals of the two branches, and facilitate the arrangement of the busbar and the implementation of the winding processing technology.

[0137] The second branch U2 includes 64 conductors 1021. Fig.10 In the table, the 64 conductors 1021 are represented by 64 serial numbers distributed in the table. The 64 conductors 1021 are connected in sequence according to the serial numbers. Fig.10 The solid arrows in the figure represent the connection mode of the 64 conductors 1021 at the welding end, and the dotted arrows represent the connection mode of the conductors 1021 at the plug-in end.

[0138] exist Fig.10 In FIG. 1 , U2+ represents the second positive lead, and U2- represents the second negative lead.

[0139] The second positive lead U2+ is connected to the No. 1 conductor 1021 of the second branch U2 , and the second negative lead U2− is connected to the No. 64 conductor 1021 of the second branch U2 .

[0140] In some embodiments of the present application, conductors 1-32 of the second branch U2 are connected in series in sequence. Conductors 1, 3, 5, and 7 are all h-layer conductors 1021, and conductors 1021 of 2, 4, 6, and 8 are all g-layer conductors 1021. Conductors 1021 of 9, 11, 13, and 15 are all f-layer conductors 1021. Conductors 10, 12, 14, and 16 are all e-layer conductors 1021. Conductors 1021 of 17, 19, 21, and 23 are all d-layer conductors 1021. Conductors 1021 of 18, 20, 22, and 24 are all c-layer conductors 1021. Conductors 1021 of 25, 27, 29, and 31 are all b-layer conductors 1021. Conductors 1021 of 26, 28, 30, and 32 are all a-layer conductors 1021.

[0141] In some embodiments of the present application, conductors 1021 of No. 33-64 of the second branch U2 are connected in series in sequence. Conductors 1021 of No. 33, 35, 37, and 39 are all a-layer conductors 1021, and conductors 1021 of No. 34, 36, 38, and 40 are all b-layer conductors 1021. Conductors 1021 of No. 41, 43, 45, and 47 are all c-layer conductors 1021. Conductors 1021 of No. 42, 44, 46, and 48 are all d-layer conductors 1021. Conductors 1021 of No. 49, 51, 53, and 55 are all e-layer conductors 1021. Conductors 1021 of No. 50, 52, 54, and 56 are all f-layer conductors 1021. Conductors 1021 of No. 57, 59, 61, and 63 are all g-layer conductors 1021. Conductors 1021 of No. 58, 60, 62, and 64 are all h-layer conductors 1021.

[0142] In some embodiments of the present application, the conductor 1021 of the first positive lead U1+ connected to the first branch U1 and the conductor 1021 of the second positive lead U2+ connected to the second branch U2 are arranged in the same winding groove 1011. In the embodiment of the present application, the inlet terminals of the two branches U2 are led out from the same winding groove 1011, thereby further reducing the distance between the inlet terminals of the two branches, facilitating the connection of the inlet terminals of the two branches, and facilitating the arrangement of the busbar and the implementation of the winding processing technology.

[0143] In the embodiment of the present application, the conductor No. 32 1021 and the conductor No. 33 1021 of the second branch U2 are both a-layer conductors 1021. The conductors 1021 connected in the same layer can balance the slot potential of the branch and reduce the circulating current loss between the branches.

[0144] In some embodiments of the present application, the No. 1 conductor 1021 connected to the second positive lead U2+ is located in the No. 14 winding groove, and the No. 64 conductor 1021 connected to the second negative lead U2- is located in the No. 7 winding groove.

[0145] In some embodiments of the present application, the No. 1 conductor 1021 connected to the second positive lead U2+ and the No. 64 conductor 1021 connected to the second negative lead U2- are both h-layer conductors 1021. This embodiment is conducive to the arrangement of the busbar, and facilitates the connection of the second positive lead U2+ and the second negative lead U2- with the external circuit.

[0146] In some embodiments of the present application, the stator includes 8 magnetic poles, and correspondingly, the phase winding includes 8 pole-phase groups. The 64 conductors 1021 of the second branch U2 are distributed in 8 pole-phase groups, which can reduce the branch potential imbalance caused by rotor eccentricity.

[0147] In some embodiments of the present application, multiple branches of the phase winding may be connected in series or in parallel. For example, the first branch U1 and the second branch U2 may be connected in series or in parallel.

[0148] like Fig.10 As shown, the No. 1 conductor 1021 of the first branch U1 is connected to the first positive lead U1+ of the first branch U1, and the No. 1 conductor 1021 of the second branch U2 is connected to the second positive lead U2+ of the second branch U2. Optionally, the No. 1 conductor 1021 of the first branch U1 and the No. 1 conductor 1021 of the second branch U2 are arranged in the same winding groove, that is, the winding groove 14. The inlet ends of the two branches are led out from the same winding groove, thereby further reducing the spacing between the line selection ends of the two branches, facilitating the connection of the inlet ends of the two branches, and facilitating the arrangement of the busbar and the implementation of the winding processing technology.

[0149] In some embodiments, the No. 1 conductor 1021 of the first branch U1 and the No. 64 conductor 1021 of the first branch U1 are both a-layer conductors 1021, and the No. 1 conductor 1021 of the second branch U2 and the No. 64 conductor 1021 of the second branch U1 are both h-layer conductors 1021. This embodiment is conducive to the arrangement of the busbar, and facilitates the connection of the two incoming terminals (U1+, U2+) and the two outgoing terminals (U1-, U2-) with the external circuit.

[0150] In some embodiments of the present application, the stator winding 102 includes three phase windings, and the three phase windings are star-connected.

[0151] For example, the steady-state voltage drop of adjacent opposite-phase conductors 1021 in the same winding slot 1011 can be expressed as [(2*4k-xy) / 4k]*U dc / 2 for calculation. dc is the bus voltage. x and y are the serial numbers of two adjacent out-of-phase conductors 1021. 4k is the total number of conductors 1021 in the first branch. In the embodiment of the present application, the maximum voltage drop of the out-of-phase conductors 1021 in the same winding slot is 0.29U dc .

[0152] The steady-state voltage drop of adjacent same-phase conductors 1021 in the same winding slot 1011 can be expressed as [|xy| / 4k]*U dc / 1.732 for calculation. dc is the bus voltage. x and y are the numbers of two adjacent same-phase conductors 1021, respectively.

[0153] In the embodiment of the present application, the maximum voltage drop of the same-phase conductor 1021 in the same winding slot is 0.27U dc .

[0154] Compared with the stators with full-pitch windings and short-pitch windings in the related art, the in-phase and out-of-phase voltage drops in the slots in the embodiments of the present application are greatly reduced, which is beneficial to the insulation design in the winding slots and improves the insulation reliability.

[0155] In summary, Fig.10 The U-phase winding shown can balance the potential of each branch slot, reduce the circulating current loss between branches, reduce the branch electromotive force imbalance caused by rotor eccentricity, reduce the voltage stress of the conductor 1021 in the slot, and is beneficial to the arrangement of the bus and the implementation of the winding processing technology.

[0156] Fig.11 A schematic diagram of three phase windings of a stator provided in some embodiments of the present application. Fig.11 A U-phase winding, a V-phase winding, and a W-phase winding of the stator winding are shown.

[0157] For example, Fig.11 As shown, the U-phase winding includes a first branch U1 and a second branch U2, U1+ represents the first positive lead of the first branch U1, and U1- represents the first negative lead of the first branch U1; U2+ represents the second positive lead of the second branch U2, and U2- represents the second negative lead of the second branch U2.

[0158] The V-phase winding includes a first branch V1 and a second branch V2, V1+ represents the first positive lead of the first branch V1, and V1- represents the first negative lead of the first branch V1; V2+ represents the second positive lead of the second branch V2, and V2- represents the second negative lead of the second branch V2.

[0159] The W-phase winding includes a first branch W1 and a second branch W2, W1+ represents the first positive lead of the first branch W1, and W1- represents the first negative lead of the first branch W1; W2+ represents the second positive lead of the second branch W2, and W2- represents the second negative lead of the second branch W2.

[0160] In some embodiments, 12 conductors connected to leads U1+, U1-, U2+, U2-, V1+, V1-, V2+, V2-, W1+, W1-, W2+, and W2- are arranged in 9 winding slots.

[0161] In some embodiments, the six conductors connected to the leads U1+, U1-, W1+, W1-, V1+, and V1- are all a-layer conductors. The aforementioned leads are all close to the radial outer ends of the stator core to facilitate welding.

[0162] like Fig.12 As shown, in some embodiments, the stator winding 102 includes three phase windings, namely, a U-phase winding, a V-phase winding, and a W-phase winding. Exemplarily, the three phase windings are connected in a triangle.

[0163] The U-phase winding includes a first branch U1 and a second branch U2 connected in series. The V-phase winding includes a first branch V1 and a second branch V2 connected in series. The W-phase winding includes a first branch W1 and a second branch W2 connected in series.

[0164] like Fig.13 As shown, in some embodiments, the stator winding includes three phase windings, namely, a U-phase winding, a V-phase winding and a W-phase winding. Exemplarily, the three phase windings are connected in a star shape.

[0165] The U-phase winding includes a first branch U1 and a second branch U2 connected in series. The V-phase winding includes a first branch V1 and a second branch V2 connected in series. The W-phase winding includes a first branch W1 and a second branch W2 connected in series.

[0166] Fig.14 A schematic diagram of the connection of phase windings of a stator winding of a stator provided in other embodiments of the present application.

[0167] like Fig.14 As shown, in some embodiments, the stator winding includes three phase windings, namely, a U-phase winding, a V-phase winding and a W-phase winding. Exemplarily, the three phase windings are connected in a triangle.

[0168] The U-phase winding includes a first branch U1 and a second branch U2 connected in parallel. The V-phase winding includes a first branch V1 and a second branch V2 connected in parallel. The W-phase winding includes a first branch W1 and a second branch W2 connected in parallel.

[0169] Fig.15 A schematic diagram of the connection of phase windings of a stator winding of a stator provided in some further embodiments of the present application.

[0170] like Fig.15 As shown, in some embodiments, the stator winding includes three phase windings, namely, a U-phase winding, a V-phase winding and a W-phase winding. Exemplarily, the three phase windings are connected in a star shape.

[0171] The U-phase winding includes a first branch U1 and a second branch U2 connected in parallel. The V-phase winding includes a first branch V1 and a second branch V2 connected in parallel. The W-phase winding includes a first branch W1 and a second branch W2 connected in parallel.

[0172] Reference Figures 12 to 15 The different stator windings shown can adjust the number of series turns of the stator windings by changing the connection mode of the phase windings and the connection mode of the branches of the phase windings, so as to adapt to applications of different voltages and power levels.

[0173] The embodiment of the present application further provides a motor, which includes the stator provided by any of the above embodiments. Exemplarily, the motor also includes a rotor, which is arranged in a space surrounded by the inner wall of the stator core.

[0174] The motor in the embodiment of the present application can be either a generator or a motor.

[0175] An embodiment of the present application also provides an electrical device, which includes the motor provided by any of the aforementioned embodiments.

[0176] In some embodiments, the electrical device includes a power assembly, which includes a reducer and the above-mentioned motor. The motor and the reducer are in transmission connection. Specifically, the drive shaft of the motor and the input shaft of the reducer can be in transmission connection through a transmission member such as a coupling to output the driving force from the motor to the reducer.

[0177] The embodiment of the present application also provides a vehicle, including the above-mentioned powertrain, which is arranged in the vehicle and provides running power for the vehicle. Specifically, in the present embodiment, the vehicle can be a new energy vehicle driven by electric energy, for example. Among them, the new energy vehicle can be a hybrid electric vehicle, a pure electric vehicle or a fuel cell electric vehicle, etc., or it can be a vehicle that uses a supercapacitor, a flywheel battery or a flywheel energy storage device as a high-efficiency energy storage device as a source of electric energy.

[0178] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0179] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A stator of a motor, comprising a stator core and a stator winding arranged on the stator core, wherein the inner wall of the stator core is provided with a plurality of winding grooves, and the stator winding comprises a conductor inserted in the plurality of winding grooves; The conductors in each winding groove are arranged in n layers, where n is a positive even number; along the direction from the bottom of the winding groove to the groove opening of the winding groove, the n layers of conductors are recorded as L1 layer, L2 layer, ... and L n layer; The stator winding includes a plurality of phase windings, each of which includes a plurality of pole phase groups; each of the pole phase groups of the phase winding includes a first region, a second region and a third region, the second region and the third region are respectively located on both sides of the first region; the conductor located in the first region is L1 layer to L n layer, the conductor located in the second region is L n / 2+1 Layer to L n The conductors located in the third region are L1 to L n / 2 layer; Each of the phase windings comprises a first branch and a second branch, wherein the first branch comprises 4k conductors connected in series in sequence, where k is a positive integer; the 4k conductors of the first branch are denoted as A1, ..., A2, ..., A4, ..., A5, ..., A6, ..., A7, ..., A8, ..., A9, ..., A1, ..., A2 ...3, ..., A4, ..., A5, ... 2k ...and A 4k The second branch includes 4k conductors connected in series, and the 4k conductors of the second branch are denoted as B1, ..., B 2k ...and B 4k ; The A1 to the A 2k , B1 to B 2k Distributed in the first area; the A 2k+1 To the A 4k A portion of the A is distributed in the second region, 2k+1 To the A 4k The remaining part of B is distributed in the third area; 2k+1 To B 4k A portion of B is distributed in the second region, 2k+1 To B 4k The remaining part is distributed in the third area.

2. The stator according to claim 1, wherein: The A 2k+1 To the A 3k Distributed in the second region, the A 3k+1 To the A 4k Distributed in the third area; 2k+1 To B 3k Distributed in the third area, the B 3k+1 To B 4k Distributed in the second area.

3. The stator according to claim 1, wherein: The A1 and the B1 are located in the same winding groove.

4. The stator according to claim 3, wherein: A1 is the conductor of layer L1 in the winding slot, and B1 is the conductor of layer L1 in the winding slot. n layer of the conductor.

5. The stator according to claim 4, wherein: The A 4k L in the winding slot n The conductor of the layer; the B 4k L in the winding slot n layer of the conductor.

6. The stator according to claim 4, wherein: The first branch includes a first positive lead connected to the A1 and a first positive lead connected to the A 4K connecting a first negative lead; The second branch includes a second positive lead connected to B1 and a second positive lead connected to B 4K Connect the second negative lead.

7. The stator according to any one of claims 1 to 6, wherein: The first branch includes a first single-conductor connector and a plurality of first double-conductor connectors, wherein the first single-conductor connector includes one conductor, and each of the first double-conductor connectors includes two conductors.

8. The stator according to claim 7, wherein: There are two first single-conductor connectors, one of which includes A1, and the other includes A 4k .

9. The stator according to claim 7, wherein: The plurality of first dual-conductor connectors include a first connector, a second connector and a third connector; The span of the two conductors of the first connector is equal to the pole pitch, the span of the two conductors of the second connector is smaller than the pole pitch, and the span of the two conductors of the third connector is larger than the pole pitch.

10. The stator according to claim 9, wherein: The A 2k and the A 2k+1 The two conductors of the third connector; The A 3k and the A 3k+1 The two conductors of the second connector.

11. The stator according to any one of claims 1 to 6, wherein: The second branch includes a second single-conductor connector and a plurality of second double-conductor connectors, wherein the second single-conductor connector includes one conductor, and each of the second double-conductor connectors includes two conductors; There are two second single-conductor connectors, one of which includes B1 and the other includes B 4k ; The plurality of said second two-conductor connectors include a fourth connector, a fifth connector and a sixth connector; The span of the two conductors of the fourth connector is equal to the pole pitch, the span of the two conductors of the sixth connector is smaller than that of the fifth connector, and the span of the two conductors of the fifth connector is smaller than the pole pitch.

12. The stator according to claim 11, wherein: B 2k and the B 2k+1 The two conductors of the fifth connector; B 3k and the B 3k+1 The two conductors of the sixth connector.

13. The stator according to any one of claims 1 to 6, wherein: The stator winding includes three phase windings, and the three phase windings are connected in star connection or delta connection.

14. The stator according to any one of claims 1 to 6, wherein: The winding groove is a multiple of 12.

15. The stator according to any one of claims 1 to 6, wherein: The number of the winding slots is 48, the n is 8, and the number of poles of the stator is 8.

16. An electric motor, comprising the stator according to any one of claims 1 to 15.

17. An electrical device comprising the motor according to claim 16.

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