Electricity utilization device, motor and stator thereof

Abstract

The application discloses a kind of electric device, motor and its stator.The stator includes stator core and stator winding, the inner wall of stator core is equipped with multiple winding slots, and the stator winding includes multiple conductors inserted in winding slot, and the stator winding includes first phase winding, the first phase winding includes first branch and second branch, and first incoming line end and second incoming line end are respectively connected to the conductors of different layers in the same winding slot;First outgoing line end and second outgoing line end are respectively connected to the conductors of different layers in the same winding slot.The technical scheme of the embodiment of the application can reduce the distance between first incoming line end and second incoming line end and the distance between first outgoing line end and second outgoing line end, facilitate the connection of two branches, and facilitate the arrangement of busbar and the implementation of winding process.

Description

Technical Field

[0001] This application relates to the field of power devices, and in particular to an electrical device, an electric motor and its stator. Background Technology

[0002] With the development of the new energy vehicle industry, the development of its drive motors is also trending towards higher voltage, higher speed, integration, platformization, and miniaturization. Among these trends, miniaturization inevitably requires a significant increase in motor power density.

[0003] Currently, reducing the voltage drop inside the motor and minimizing internal energy loss is also one of the research goals in this field. Summary of the Invention

[0004] In view of the above problems, this application provides an electrical device, a motor and its stator, which can reduce the voltage drop of the internal windings of the motor and reduce the internal energy loss of the motor.

[0005] In a first aspect, this application provides a stator for an electric motor, including a stator core and a stator winding disposed on the stator core. The inner wall of the stator core has multiple winding slots, and the stator winding includes multiple conductors inserted into the winding slots. The stator winding includes a first phase winding, which includes a first branch and a second branch. The first branch includes a first input terminal, a first output terminal, and multiple conductors connected in series between the first input terminal and the first output terminal. The second branch includes a second input terminal, a second output terminal, and multiple conductors connected in series between the second input terminal and the second output terminal. The first input terminal and the second input terminal are respectively connected to conductors of different layers in the same winding slot. The first output terminal and the second output terminal are respectively connected to conductors of different layers in the same winding slot.

[0006] In the technical solution of this application embodiment, by connecting the first input terminal and the second input terminal to conductors of different layers in the same winding slot, and connecting the first output terminal and the second output terminal to conductors of different layers in the same winding slot, the distance between the first input terminal and the second input terminal and the distance between the first output terminal and the second output terminal can be reduced, which facilitates the connection of the two branches and is beneficial to the arrangement of the busbar and the implementation of the winding processing technology.

[0007] In some embodiments, the conductors in each winding slot are configured as n layers, where n is a positive even number; along the direction from the bottom of the winding slot to the opening of the winding slot, the n layers of conductors are denoted as L1 layer, ..., Li layer, ... and Ln layer, where 1≤i≤n; the first input terminal and the second input terminal are respectively connected to the L1 layer conductor and the Ln layer conductor in the same winding slot; the first output terminal and the second output terminal are respectively connected to the L1 layer conductor and the Ln layer conductor in the same winding slot.

[0008] In the above embodiments, both the first input terminal and the first output terminal are connected to the L1 layer conductor, which is located near the outer radial end of the stator core. This facilitates the welding of the first input terminal and the first output terminal to the external busbar. Both the second input terminal and the second output terminal are connected to the Ln layer conductor, which is located near the inner radial end of the stator core. This also facilitates the welding of the second input terminal and the second output terminal to the external busbar.

[0009] In some embodiments, both the first branch and the second branch include multiple connectors connected in series, each connector including at least one conductor. One or more conductors may be disposed in the connector. The conductors are disposed in the winding slot, resulting in a simple structure, ease of production, and small space occupation. The above technical solution can improve the power density of the motor.

[0010] In some embodiments, in the first branch, at least two interconnected conductors are in the same layer along the direction from the first incoming terminal to the first outgoing terminal. Conductors connected in the same layer can balance the slot potential of the branch and reduce circulating current losses between branches.

[0011] In some embodiments, the first branch includes 2k conductors; along the direction from the first input terminal to the second input terminal, the first branch includes 2k conductors, denoted as A1, A2, ..., A... k A 2k-1 and A 2k ;Ath k The conductor and the Ath k+1 Each conductor is L n Layer conductor; A1 to A1 conductors k A conductor runs along the first wave winding direction from layer L1 to layer L. n The layers are connected sequentially, the Ath layer k+1 The conductor to the Ath 2k A conductor follows the second wave winding direction from L n Layer L1 is connected sequentially, with the first wave winding direction opposite to the second wave winding direction. This arrangement minimizes the voltage drop between conductors in adjacent winding slots within the same phase winding.

[0012] In some embodiments, in the second branch, at least two interconnected conductors are in the same layer along the direction from the second incoming terminal to the second outgoing terminal. Conductors connected in the same layer can balance the slot potential of the branch and reduce circulating current losses between branches.

[0013] In some embodiments, the second branch includes 2k conductors; along the direction from the second input terminal to the second input terminal, the second branch includes 2k conductors, denoted as B1, B2, ..., B... k ... B 2k-1 and B 2k ; Bk The conductor and the Bth conductor k+1 All conductors are L1 layer conductors; conductors B1 to B... k A conductor follows the second wave winding direction from L n Layer B is connected sequentially from layer B to layer L1. k+1 The conductor to the Bth 2k A conductor runs along the first wave winding direction from layer L1 to layer L. n The layers are connected sequentially. This arrangement minimizes the voltage drop between adjacent conductors in the same winding slot.

[0014] In some embodiments, the first phase winding includes 2p pole phase groups, where p is a positive integer; multiple conductors of the first branch are distributed in all pole phase groups, and multiple conductors of the second branch are distributed in all pole phase groups. The above technical solution can reduce the branch potential imbalance caused by rotor eccentricity and improve the energy conversion efficiency of the motor.

[0015] In some embodiments, within the winding grooves where the first and second branches are distributed, the conductors of the first branch and the second branch are alternately arranged along the direction from the bottom of the winding groove to the opening of the winding groove.

[0016] In some embodiments, two adjacent conductors located in the same winding slot are denoted as layer Ax and layer By, respectively, where 1≤x≤y≤k, and |yx|≤k.

[0017] The greater the difference in conductor numbers, the greater the voltage difference between the two conductors. If the difference in conductor numbers between two adjacent conductors located in the same winding slot is too large, it will cause excessive voltage stress on the conductors within the winding slot. The winding scheme described above can ensure that |yx|≤k, thereby reducing the voltage stress between the conductors within the winding slot and lowering the voltage drop within the slot.

[0018] In some embodiments, the inner wall of the stator core is provided with 12*N winding slots, where N is a positive integer; the conductors of the first phase winding are distributed in 4*N winding slots; the stator winding also includes a second phase winding and a third phase winding, the second phase winding being distributed in 4*N winding slots and the third phase winding being distributed in 4*N winding slots.

[0019] Secondly, this application provides an electric motor, including the stator in the above embodiments.

[0020] Thirdly, this application provides an electrical device, including the motor in the above embodiments.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a motor stator provided in some embodiments of this application;

[0024] Figure 2 This is a cross-sectional schematic diagram of the stator provided in some embodiments of this application;

[0025] Figure 3 This application provides schematic diagrams of the structure of the stator connectors provided in some embodiments;

[0026] Figure 4 Schematic diagrams of the structure of the stator connectors provided in other embodiments of this application;

[0027] Figure 5 for Figure 1 Another structural schematic diagram of the stator shown;

[0028] Figure 6 A schematic diagram of the structure of the first phase winding of the stator winding provided in some embodiments of this application;

[0029] Figure 7 A schematic diagram of a phase winding of a stator provided in some embodiments of this application;

[0030] Figure 8 for Figure 2 An enlarged view of box A;

[0031] Figure 9 A schematic diagram of a phase winding of a stator provided for other embodiments of this application;

[0032] Figure 10 A schematic diagram of the three phase windings of the stator provided in some embodiments of this application;

[0033] Figure 11 A schematic diagram of the connection of the phase windings of the stator windings provided in some embodiments of this application;

[0034] Figure 12 A schematic diagram of the connection of the phase windings of the stator windings provided in other embodiments of this application;

[0035] Figure 13 A schematic diagram of the connection of the phase windings of the stator windings provided in some embodiments of this application.

[0036] Figure 14 This application provides a schematic diagram of the connection of the phase windings of the stator windings in some embodiments.

[0037] The accompanying drawings are not necessarily drawn to scale. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0040] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0044] In this application, "multiple" means two or more (including two).

[0045] Currently, in the drive motors of new energy vehicles, the stator generally consists of a stator core and conductors wound around it. The conductors are wound in the slots of the stator core, forming a single structure known as the stator winding. To improve slot fill factor, multiple layers of conductors can be placed in a single slot. The stator winding typically includes multiple phase windings, each phase winding comprising multiple branches, which are usually connected via busbars. The inventors noted that in related technologies, the distance between the terminals of each branch is relatively large, resulting in a large space occupied by the busbars connecting the branches, leading to a larger motor size.

[0046] For the reasons mentioned above, the inventors researched and designed a stator for an electric motor. By connecting the first and second input terminals to conductors of different layers in the same winding slot, and connecting the first and second output terminals to conductors of different layers in the same winding slot, the distance between the first and second input terminals and the distance between the first and second output terminals can be reduced. This facilitates the connection of the two branches and is beneficial for the arrangement of the busbar and the implementation of the winding processing technology.

[0047] For ease of understanding, the following explanations are provided for the technical terms used in this application.

[0048] Stator: refers to the stationary part of an electric motor, whose function is to generate a rotating magnetic field.

[0049] Rotor: refers to the rotating part in an electric motor, which is used to convert electrical energy into mechanical energy.

[0050] Span: refers to the distance spanned 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.

[0051] Number of pole pairs P: The number of pole pairs refers to the number of magnetic poles formed when the motor windings are energized, with N and S poles appearing in pairs. The total number of magnetic poles is 2P.

[0052] Pole pitch: Pole pitch refers to the distance occupied by each magnetic pole of a motor along the circumference of the air gap. Pole pitch can be expressed by the number of winding slots in the stator core. For example, the pole pitch is Z / 2P; Z is the total number of winding slots in the stator core.

[0053] Pole phase group: In an AC motor, a group of multiple coils belonging to the same phase winding with a single pole pitch connected in series is called a pole phase group, also known as a coil group. The current direction and electromagnetic effect of each coil in the pole phase group are the same, and these coils together generate the magnetic pole in that phase winding.

[0054] Phase winding: A phase winding refers to a set of windings consisting of one or more parallel branches connected in series or parallel according to a specified connection method. The conductors in a phase winding typically span multiple pole pitches, and the coils are interconnected to form a whole.

[0055] Figure 1 A schematic diagram of the structure of a motor stator provided in some embodiments of this application; Figure 2 This is a cross-sectional schematic diagram of the stator provided in some embodiments of this application; Figure 3 This application provides schematic diagrams of the structure of the stator connectors provided in some embodiments; Figure 4 Schematic diagrams of the structure of the stator connectors provided in other embodiments of this application; Figure 5 for Figure 1 Another structural schematic diagram of the stator shown; Figure 6 This is a schematic diagram of the structure of the first phase winding of the stator winding provided in some embodiments of this application.

[0056] like Figure 1 and Figure 2 As shown, some embodiments of this application provide a stator 10 of an electric motor, the stator 10 including a stator core 101 and a stator winding 102. The stator winding 102 is disposed on the stator core 101, and the inner wall of the stator core 101 is provided with a plurality of winding slots 1011. The stator winding 102 includes a plurality of conductors 1021 inserted in the winding slots 1011.

[0057] Conductor 1021 is the part of the stator winding 102 that is embedded in the stator core 101 and plays the role of electromagnetic pole energy conversion.

[0058] The cross-section of conductor 1021 can be circular, rectangular, or other shapes. For example, conductor 1021 is a flat wire conductor.

[0059] In some embodiments, such as Figure 3As shown, the stator winding 102 includes a plurality of connectors 1022, each connector 1022 including at least one conductor 1021. The portion of the connector 1022 inserted into the winding slot 1011 can serve as the conductor 1021.

[0060] In some embodiments, please refer to the reference Figure 4 Each connector 1022 includes a first connector portion 1026, a second connector portion 1027, and a connecting portion 1028 connecting the first connector portion 1026 and the second connector portion 1027. The portion of the first connector portion 1026 that is inserted into the winding groove 1011 can serve as a conductor 1021, and the portion of the second connector portion 1027 that is inserted into the winding groove 1011 can also serve as a conductor 1021.

[0061] In some embodiments, the connector 1022 further includes a first extension 1029 and a second extension 1030. The first extension 1029 extends from one end of the first connector 1026 away from the first connecting portion 1028, and the second extension 1030 extends from one end of the second connector 1027 away from the first connecting portion 1028. The first extension 1029 and the second extension 1030 extend out of the winding groove 1011 to facilitate connection with other connectors.

[0062] In some embodiments, such as Figure 5 As shown, the stator core 101 has a first end 1012 and a second end 1013 along its own axial direction. A winding slot 1011 extends from the first end 1012 to the second end 1013, penetrating the stator core 101. Along the axial direction of the stator core 101, the stator winding 102 may include a insertion end and a welding end. The insertion end of the stator winding 102 may be located at the first end 1012 of the stator core 101, and the welding end of the stator winding 102 may be located at the second end 1013 of the stator core 101. When winding the connector 1022, the connector 1022 may be inserted into the winding slot 1011 via the first end 1012 and extend out of the winding slot 1011 via the second end 1013. A connecting portion 1028 may be located at the first end 1012 of the stator core 101.

[0063] For example, the connector 1022 is a hairpin coil. Before being inserted into the winding slot 1011, the connector 1022 may include two straight edges that are inserted into the winding slot 1011 via a first end 1012. The portions of the two straight edges that are accommodated in the winding slot 1011 respectively form a first insertion portion 1026 and a second insertion portion 1027. Please refer to... Figure 4 The portions of the two straight sides extending through the second end 1013 respectively form the first extension 1029 and the second extension 1030.

[0064] The first extension 1029 and the second extension 1030 are both disposed at the welding end of the stator winding 102. After the connector 1022 is inserted into the stator core 101, 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 to other connectors 1022.

[0065] Multiple winding slots 1011 are arranged circumferentially along the stator core 101. Adjacent connectors 1022 can be directly connected or indirectly connected through other conductive structures. For example, a conductive strip can be provided at the second end 1013 of the stator core 101, with both ends of the conductive strip welded to two adjacent connectors 1022 to connect the two adjacent connectors 1022.

[0066] In some embodiments of this application, the connector 1022 can be a full-pitch coil, the span of which is equal to the pole pitch of the stator 10. The full-pitch coil typically spans M winding slots 1011; exemplarily, M = 6.

[0067] In some embodiments, a plurality of winding slots 1011 are uniformly arranged circumferentially along the inner wall of the stator core 101. In other words, the plurality of winding slots 1011 are equidistantly arranged circumferentially. When designing the connector 1022, the span of the connector 1022 can be determined according to the number of slots, thereby reducing the wire profile of the connector 1022 and simplifying the winding process.

[0068] In some embodiments, the winding groove 1011 extends axially along the stator core 101 and penetrates the stator core 101 axially. This embodiment can reduce the bending of the connector 1022 during the insertion of the connector 1022 into the winding groove 1011, thus reducing assembly difficulty.

[0069] In some embodiments, the number of winding slots 1011 is 12*N, where N is a positive integer. For example, the span between the first plug-in portion 1026 and the second plug-in portion 1027 is 6 winding slots 1011.

[0070] In some embodiments, the first insertion portion 1026 and the second insertion portion 1027 respectively serve as conductors 1021 in corresponding winding slots 1011. The conductors 1021 in each winding slot 1011 are configured as multiple layers. The multiple conductors 1021 are sequentially distributed along the direction from the bottom of the winding slot 1011 to the opening of the winding slot 1011. Optionally, the multiple conductors 1021 are stacked radially along the stator core 101.

[0071] The first insertion portion 1026 and the second insertion portion 1027 of the connector 1022 are two conductors 1021 of the connector 1022. The conductors 1021 are the effective sides of the connector 1022, which are embedded in the stator core 101 and play the role of electromagnetic pole energy conversion. Providing multiple layers of conductors 1021 can improve the electromagnetic pole energy conversion efficiency.

[0072] In some embodiments, the two conductors 1021 of the connector 1022 are respectively embedded in two winding slots 1011. The multilayer conductors 1021 in each winding slot 1011 belong to multiple connectors 1022. The slot opening of the winding slot 1011 is formed on the inner wall of the stator core 101 facing the rotor. The bottom of the winding slot 1011 is the bottom wall of the winding slot 1011 opposite to the slot opening.

[0073] In some embodiments, the cross-section of conductor 1021 can be any one or more of rectangular, elliptical, or racetrack-shaped shapes. The above-described structure can improve the slot fill factor of stator core 101.

[0074] In some embodiments, the stator winding 102 includes a plurality of phase windings, each phase winding including at least one branch, and each branch including a plurality of series-connected connectors 1022. The number of phase windings can be 2, 3, 4, or 5. Of course, the number of phase windings can also be greater than 5. The stator 10 of this embodiment is applicable to motors with different numbers of phases and can be adapted to different voltage and power ranges.

[0075] In some embodiments, the stator winding 102 may include three phase windings, namely a first phase winding 1023, a second phase winding, and a third phase winding. Exemplarily, the first phase winding 1023 is a U-phase winding, the second phase winding is a V-phase winding, and the third phase winding is a W-phase winding.

[0076] Each phase winding may include only one branch or multiple branches. The branches of a phase winding can also be called parallel branches. The number of branches in a phase winding can be any integer to expand the range of winding design applications and adapt to different voltage and power ranges. For example, in the embodiments of this application, the phase winding includes a first branch U1 and a second branch U2.

[0077] In some embodiments, both the first branch U1 and the second branch U2 may include multiple connectors 1022. The multiple connectors 1022 of the first branch U1 are connected in series, and the multiple connectors 1022 of the second branch U2 are also connected in series. This embodiment does not limit the number of connectors 1022 in the branches. The number of connectors 1022 in the branches can be freely adjusted as needed, thereby expanding the application range of the winding design and adapting to different voltage and power ranges.

[0078] Figure 6A schematic diagram of the structure of a phase winding of a stator provided in some embodiments of this application; Figure 7 This is a schematic diagram of the first phase winding 1023 of the stator 10 provided in some embodiments of this application.

[0079] like Figure 7 As shown, in some embodiments, the stator winding 102 includes a first phase winding 1023, which includes a first branch and a second branch. The first branch includes a first input terminal, a first output terminal, and a plurality of conductors 1021 connected in series between the first input terminal and the first output terminal. The second branch includes a second input terminal, a second output terminal, and a plurality of conductors connected in series between the second input terminal and the second output terminal. The first input terminal and the second input terminal are respectively connected to conductors 1021 of different layers in the same winding slot 1011; the first output terminal and the second output terminal are respectively connected to conductors 1020 of different layers in the same winding slot 1011.

[0080] For example, Figure 7 The U-phase winding is shown. The stator winding of this application will be described in detail below using the U-phase winding as an example.

[0081] like Figure 7 As shown, the U-phase winding includes multiple branches, two of which are designated as the first branch U1 and the second branch U2.

[0082] For ease of understanding, Figure 7 In the table, 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.

[0083] One of the first incoming terminal and the first outgoing terminal is the positive terminal, and the other is the negative terminal. The polarity of the second incoming terminal is the same as that of the first incoming terminal, and the polarity of the second outgoing terminal is the same as that of the first outgoing terminal.

[0084] For example, the following explanation uses the first and second incoming terminals as positive terminals, and the first and second outgoing terminals as negative terminals. Correspondingly, in Figure 7 In the diagram, U1+ represents the first incoming terminal of the first branch U1, and U1- represents the first outgoing terminal of the first branch U1; U2+ represents the second incoming terminal of the second branch U2, and U2- represents the second outgoing terminal of the second branch U2.

[0085] exist Figure 7 In the various tables, N and S represent the two magnetic poles of the stator. For example, the stator has 8 magnetic poles, that is, 4 pole pairs.

[0086] The stator core has multiple winding slots 1011, which are represented by a row of numbers below the N and S poles. For example, in... Figure 7 In the stator core 101, there are 48 winding slots 1011. Figure 7 In the diagram, the 48 winding slots 1011 are represented by a row of numbers below the N pole and S pole, i.e., 1-48. Optionally, each magnetic pole corresponds to 6 winding slots 1011.

[0087] Each winding slot 1011 contains multiple layers of conductors 1021. Exemplarily, in... Figure 7 In the winding groove 1011, each winding groove contains eight conductors 1021. The eight conductors 1021 are located in layers a, b, c, d, e, f, g, and h, respectively.

[0088] The first branch U1 includes multiple conductors 1021 connected in series. For example, in... Figure 7 In the first table, the multiple conductors of the first branch U1 are represented by serial numbers distributed in the table. For example, the first branch U1 includes 64 conductors, which are represented by 64 serial numbers distributed in the table; the 64 conductors of the first branch U1 are connected sequentially according to their serial numbers; the first incoming terminal is connected to the first conductor, and the first outgoing terminal is connected to the 64th conductor.

[0089] The second branch U2 includes multiple conductors connected in series. For example, in... Figure 7 In the second table, the multiple conductors of the second branch U2 are represented by their serial numbers in the table. For example, the second branch U2 includes 64 conductors, which are represented by 64 serial numbers in the table; the 64 conductors of the second branch U2 are connected sequentially according to their serial numbers; the second incoming terminal is connected to the first conductor, and the second outgoing terminal is connected to the 64th conductor.

[0090] In this embodiment of the application, by connecting the first input terminal and the second input terminal to conductors of different layers in the same winding groove 1011, and connecting the first output terminal and the second output terminal to conductors of different layers in the same winding groove 1011, the distance between the first input terminal and the second input terminal and the distance between the first output terminal and the second output terminal can be reduced, which facilitates the connection of the two branches and is beneficial to the arrangement of the busbar and the implementation of the winding processing technology.

[0091] In some embodiments, such as Figure 8 As shown. The conductors in each winding slot 1011 are configured as n layers, where n is a positive even number. Along the direction from the bottom of the winding slot 1011 to the opening of the slot, the n layers of conductors are denoted as L1 layer, ..., L... i Layer, ... and L n Layer, 1≤i≤n. The first and second input terminals are respectively connected to the L1 layer conductor and the L layer conductor in the same winding slot 1011. nLayer conductor. The first and second output terminals are respectively connected to the L1 layer conductor and the L1 layer conductor in the same winding slot 1011. n Layered conductor.

[0092] For example, n can be 2, 4, 6, 8, 16, or 32. Alternatively, as... Figure 7 As shown, n is 8, and layers L1 to L8 can also be denoted as layer a, layer b, layer c, layer d, layer e, layer f, layer g, and layer h, respectively.

[0093] In the above embodiment, both the first input terminal U1+ and the first output terminal U1- are connected to the L1 layer conductor, which is located near the radial outer end of the stator core 101. This facilitates the connection of the first input terminal U1+ and the first output terminal U1- to the external busbar. The second input terminal U2+ and the second output terminal U2- are both connected to the L1 layer conductor. n Layer conductor, while L n The layer conductor is located near the inner end of the stator core along the radial direction, which facilitates the connection of the second incoming and second outgoing terminals to the external busbar.

[0094] In some embodiments of this application, both the first branch U1 and the second branch U2 include multiple connectors 1022 connected in series, and each connector 1022 includes at least one conductor. One or more conductors can be provided in the connector 1022, and the conductors are disposed in the winding groove 1011. This structure is simple, easy to manufacture, and occupies little space. The above technical solution can improve the power density of the motor.

[0095] In some embodiments of this application, in the first branch U1, at least two interconnected conductors are located in the same layer along the direction from the first incoming terminal to the first outgoing terminal. Conductors connected in the same layer can balance the slot potential of the branch and reduce circulating current losses between branches.

[0096] In the embodiments of this application, please continue to refer to Figure 7 The first branch includes 2k conductors; along the direction from the first incoming terminal to the second incoming terminal, the first branch includes 2k conductors, denoted as A1, A2, ..., A... k A 2k-1 and A 2k ;Ath k The conductor and the Ath k+1 Each conductor is L n Layer conductor; A1 to A1 conductors k A conductor runs along the first wave winding direction from layer L1 to layer L. n The layers are connected sequentially, the Ath layer k+1 The conductor to the Ath 2k A conductor follows the second wave winding direction from L nLayer L1 is connected sequentially, with the first wave's winding direction being opposite to that of the second wave.

[0097] Specifically, the k-layer conductors of the branch are connected in series, from layer A1 to layer A. k The layers are connected sequentially, then from A k Layers are connected sequentially to A 2k Layer. For example, layer A1 is connected to the first incoming line terminal, A... 2k The layer is connected to the first outgoing terminal.

[0098] The first winding direction can be clockwise, with the conductor interleaved between adjacent layers. For example, the conductor starts from layer L1 of slot J, crosses G winding slots clockwise, and winds to layer L2 of slot J+G; then crosses G winding slots clockwise again, and winds to layer L1 of slot J+2G… This cycle continues until it returns to slot J, then winds to layer L3 of slot J, then winds clockwise from layer L3 of slot J, crosses G winding slots clockwise, and winds to layer L4 of slot J+G; then crosses G winding slots clockwise again, and winds to layer L3 of slot J+2G… This cycle continues, winding the L… n layer.

[0099] The second winding direction, opposite to the first, can be achieved by interleaving the conductor between adjacent layers in a counter-clockwise direction. For example, the conductor starts from slot J at the Lth... n After the layer winds clockwise across G winding slots, it winds to the Lth slot of J+G. n-1 In the layer; then, after traversing G winding slots clockwise, it winds to the Lth slot of J+2G. n The process continues in this loop until it returns to slot J, then the Lth layer of slot J is wound around. n-2 Layer, then proceed clockwise from slot J to the Lth layer. n-2 After the layer winds clockwise across G winding slots, it winds to the Lth slot of J+G. n-3 In the layer; then, after traversing G winding slots clockwise, it winds to the Lth slot of J+2G. n-2 The process continues in this way, creating the L1 layer of the winding groove.

[0100] The inventors noticed that within the winding slot, the greater the difference in the serial numbers of adjacent conductors, the greater the voltage difference between the two conductors. If the difference in serial numbers between two adjacent conductors located in the same winding slot is too large, it will cause excessive voltage stress between the conductors within the winding slot, affecting the insulation reliability of the stator winding.

[0101] By employing the above-described configuration, the voltage drop between adjacent conductors within the same winding slot can be minimized, thereby improving insulation reliability. Specifically, this embodiment is not limited to the aforementioned connector; other winding connector methods can also be used, as long as the conductor sequence difference meets the required range.

[0102] In some embodiments of this application, in the second branch U2, at least two interconnected conductors 1021 are located on the same layer along the direction from the second incoming terminal to the second outgoing terminal. In the above technical solution, the interconnected conductors 1021 on the same layer can also balance the slot potential of the branch and reduce circulating current losses between branches.

[0103] In some embodiments of this application, the second branch U2 includes 2k conductors; along the direction from the second input terminal to the second input terminal, the second branch includes 2k conductors, denoted as B1, B2, ..., B... k ... B 2k-1 and B 2k ; B k The conductor and the Bth conductor k+1 All conductors are L1 layer conductors; conductors B1 to B... k A conductor follows the second wave winding direction from L n Layer B is connected sequentially from layer B to layer L1. k+1 The conductor to the Bth 2k A conductor runs along the first wave winding direction from layer L1 to layer L. n The layers are connected sequentially. This arrangement minimizes the voltage drop between adjacent conductors in the same winding slot.

[0104] In some embodiments of this application, the first phase winding includes 2p pole phase groups, where p is a positive integer; the multiple conductors 1021 of the first branch U1 are distributed in all pole phase groups, and the multiple conductors 1021 of the second branch U2 are distributed in all pole phase groups. The above technical solution can reduce the branch potential imbalance caused by rotor eccentricity.

[0105] In some embodiments of this application, in the winding grooves where the first branch U1 and the second branch U2 are distributed, the conductors 1021 of the first branch U1 and the second branch U2 are alternately arranged along the direction from the bottom of the winding groove to the opening of the winding groove.

[0106] In some embodiments of this application, two adjacent conductors located in the same winding slot are respectively denoted as A. x Layer and B y Layer, 1≤x≤y≤k, where |yx|≤k.

[0107] The greater the difference in conductor serial numbers, the greater the voltage difference between the two conductors. If the difference in serial numbers between two adjacent conductors located in the same winding slot 1011 is too large, it will cause excessive voltage stress on conductor 1021 within winding slot 1011. The above technical solution ensures that |yx|≤k to reduce the voltage stress between conductors within winding slot 1011 and improve insulation reliability.

[0108] For example, the first incoming terminal U1+ is connected to the first conductor of the first branch U1, and the first outgoing terminal U1- is connected to the 64th conductor of the first branch U1.

[0109] In some embodiments, conductors 1-32 of the first branch are connected in series sequentially. Conductors 1, 3, 5, and 7 are all layer a conductors; conductors 2, 4, 6, and 8 are all layer b conductors; conductors 9, 11, 13, and 15 are all layer c conductors; conductors 10, 12, 14, and 16 are all layer d conductors; conductors 17, 19, 21, and 23 are all layer e conductors; conductors 18, 20, 22, and 24 are all layer f conductors; conductors 25, 27, 29, and 31 are all layer g conductors; and conductors 26, 28, 30, and 32 are all layer h conductors.

[0110] In some embodiments, conductors 33-64 of the first branch are connected in series. Conductors 33, 35, 37, and 39 are all g-layer conductors; conductors 34, 36, 38, and 40 are all h-layer conductors; conductors 41, 43, 45, and 47 are all f-layer conductors; conductors 42, 44, 46, and 48 are all e-layer conductors; conductors 49, 51, 53, and 55 are all d-layer conductors; conductors 50, 52, 54, and 56 are all c-layer conductors; conductors 57, 59, 61, and 63 are all b-layer conductors; and conductors 58, 60, 62, and 64 are all a-layer conductors.

[0111] In some embodiments of this application, conductors 32 and 33 of the first branch are both h-layer conductors. The conductors 1021 connected in the same layer can also balance the slot potential of the branches, reducing circulating current losses between branches.

[0112] In some embodiments, the first conductor connected to the first input terminal U1+ is located in the 13th winding slot, and the 64th conductor connected to the first output terminal U1- is located in the 20th winding slot.

[0113] In some embodiments, the first conductor connected to the first input terminal U1+ and the 64th conductor connected to the first output terminal U1- are both layer a conductors. This embodiment is advantageous for busbar arrangement and facilitates the connection of the first input terminal U1+ and the first output terminal U1- to the external circuit.

[0114] In some embodiments, the stator includes eight magnetic poles, and correspondingly, the phase windings include eight pole phase groups. The 16 connectors of branch U1 are distributed among the eight pole phase groups, which can reduce the branch potential imbalance caused by rotor eccentricity.

[0115] In some embodiments, the span between the conductor connected to the first input terminal of the first branch U1 and the conductor connected to the second input terminal of the second branch U2 is less than or equal to the pole pitch. This embodiment can reduce the distance between the input terminals of the two branches, facilitating the connection of the input terminals of the two branches and benefiting the arrangement of the busbar and the implementation of the winding processing technology.

[0116] The second branch U2 includes 64 conductors. Figure 7 In the table, the 64 conductors are represented by 64 serial numbers. The 64 conductors are connected sequentially according to their serial numbers.

[0117] For example, the positive terminal is the second input terminal, and the negative terminal is the second output terminal. Figure 7 In the diagram, U2+ represents the second incoming terminal, and U2- represents the second outgoing terminal.

[0118] The second incoming terminal U2+ is connected to the first conductor of the second branch U2, and the second outgoing terminal U2- is connected to the 64th conductor of the second branch U2.

[0119] In some embodiments, conductors 1-32 of the second branch are connected in series. Conductors 1, 3, 5, and 7 are all h-layer conductors; conductors 2, 4, 6, and 8 are all g-layer conductors; conductors 9, 11, 13, and 15 are all f-layer conductors; conductors 10, 12, 14, and 16 are all e-layer conductors; conductors 17, 19, 21, and 23 are all d-layer conductors; conductors 18, 20, 22, and 24 are all c-layer conductors; conductors 25, 27, 29, and 31 are all b-layer conductors; and conductors 26, 28, 30, and 32 are all a-layer conductors.

[0120] In some embodiments, conductors 33-64 of the second branch are connected in series. Conductors 33, 35, 37, and 39 are all layer a conductors; conductors 34, 36, 38, and 40 are all layer b conductors; conductors 41, 43, 45, and 47 are all layer c conductors; conductors 42, 44, 46, and 48 are all layer d conductors; conductors 49, 51, 53, and 55 are all layer e conductors; conductors 50, 52, 54, and 56 are all layer f conductors; conductors 57, 59, 61, and 63 are all layer g conductors; and conductors 58, 60, 62, and 64 are all layer h conductors.

[0121] In some embodiments, the conductor 1021 connected to the first input terminal of the first branch U1 and the conductor 1021 connected to the second input terminal of the second branch U2 are disposed in the same winding groove 1011. This embodiment of the application draws the input terminals of the two branches from the same winding groove 1011, thereby further reducing the distance between the input terminals of the two branches, facilitating the connection of the input terminals of the two branches, and benefiting the arrangement of the busbar and the implementation of the winding processing technology.

[0122] In the embodiments of this application, conductors 32 and 33 of the second branch U2 are both layer a conductors. The interconnected conductors in the same layer can also balance the slot potential of the branch, reducing circulating current losses between branches.

[0123] In some embodiments, the first conductor connected to the second incoming terminal U2+ is located in the 13th winding slot, and the 64th conductor connected to the second outgoing terminal U2- is located in the 20th winding slot.

[0124] In some embodiments, the first conductor connected to the second incoming terminal U2+ and the 64th conductor connected to the second outgoing terminal U2- are both layer a conductors. This embodiment is advantageous for busbar arrangement and facilitates the connection of the first incoming terminal U1+ and the first outgoing terminal U1- to the external circuit.

[0125] In some embodiments, the stator 10 includes eight magnetic poles, and correspondingly, the phase windings include eight pole phase groups. The 16 connectors of the second branch U2 are distributed among the eight pole phase groups, which can reduce the branch potential imbalance caused by rotor eccentricity.

[0126] In some embodiments, the span between the conductor connected to the first input terminal of the first branch U1 and the conductor connected to the second input terminal of the second branch U2 is less than or equal to the pole pitch. This embodiment can reduce the distance between the input terminals of the two branches, facilitating the connection of the input terminals of the two branches and benefiting the arrangement of the busbar and the implementation of the winding processing technology.

[0127] In some embodiments, the multiple branches of the phase winding can be connected in series or in parallel. For example, the first branch U1 and the second branch U2 can be connected in series or in parallel.

[0128] like Figure 7 As shown, the first conductor of the first branch U1 is connected to the first incoming terminal U1+ of the first branch U1, and the first conductor of the second branch U2 is connected to the second outgoing terminal U2+ of the second branch U2. Optionally, the first conductor of the first branch U1 and the first conductor of the second branch U2 are located in the same winding slot, i.e., winding slot 13. The first incoming terminals of the two branches are led out from the same winding slot 1011, thereby further reducing the distance between the incoming terminals of the two branches, facilitating the connection of the incoming terminals of the two branches, and benefiting the arrangement of the busbar and the implementation of the winding processing technology.

[0129] In some embodiments, the first conductor of the first branch U1 and the 64th conductor of the first branch U1 are both layer a conductors, and the first conductor of the second branch U2 and the 64th conductor of the second branch U1 are both layer h conductors. This embodiment is advantageous for the arrangement of the busbar, facilitating the connection of the first incoming terminal (U1+, U2+) and the outgoing terminal (U1-, U2-) to the external circuit respectively.

[0130] Figure 7 The U-phase winding shown can balance the slot potential of each branch, reduce circulating current losses between branches, reduce the electromotive force imbalance caused by rotor eccentricity, reduce voltage stress on conductors within the slot, and facilitate busbar arrangement and winding processing. In this embodiment, the maximum voltage drop between adjacent conductors in the same winding slot can be reduced to 0.47U. ph (U ph (Phase voltage). Compared to traditional stator windings, the embodiments of this application can reduce the voltage drop in the winding slot by 51.5%.

[0131] Figure 9 This is a schematic diagram of a phase winding of a stator provided in some embodiments of this application. Exemplarily, Figure 9 The U-phase winding is shown.

[0132] like Figure 9 As shown, in some embodiments, each winding slot contains six conductors. The eight conductors are located in layers a, b, c, d, e, and f, respectively.

[0133] exist Figure 9 In the diagram, U1+ represents the first incoming terminal of the first branch U1, and U1- represents the first outgoing terminal of the first branch U1; U2+ represents the second incoming terminal of the second branch U2, and U2- represents the second outgoing terminal of the second branch U2.

[0134] N and S represent the two magnetic poles of the stator. For example, the stator has 8 magnetic poles, or 4 pole pairs. The stator core has 48 winding slots. Figure 9 In the diagram, the 48 winding slots are represented by a row of numbers below the N and S poles, i.e., 1-48. Each magnetic pole corresponds to 6 winding slots.

[0135] For example, the positive terminal is the first input terminal, and the negative terminal is the first output terminal. Figure 8 In the diagram, U1+ represents the first incoming line terminal, and U1- represents the first outgoing line terminal.

[0136] The first incoming terminal U1+ is connected to conductor number 1, and the first outgoing terminal U1- is connected to conductor number 48.

[0137] In some embodiments, conductors 1-24 of the first branch are connected in series. Conductors 1, 3, 5, and 7 are all layer a conductors; conductors 2, 4, 6, and 8 are all layer b conductors; conductors 9, 11, 13, and 15 are all layer c conductors; conductors 10, 12, 14, and 16 are all layer d conductors; conductors 17, 19, 21, and 23 are all layer e conductors; and conductors 18, 20, 22, and 24 are all layer f conductors.

[0138] In some embodiments, conductors 25-48 of the first branch U1 are connected in series. Conductors 25, 27, 29, and 31 are all f-layer conductors. Conductors 26, 28, 30, and 32 are all e-layer conductors. Conductors 33, 35, 37, and 39 are all d-layer conductors. Conductors 34, 36, 38, and 40 are all c-layer conductors. Conductors 41, 43, 45, and 47 are all b-layer conductors. Conductors 42, 44, 46, and 48 are all a-layer conductors.

[0139] In the embodiments of this application, conductors 24 and 25 of the first branch U1 are both f-layer conductors. These two connectors 1022 can be welded with a full gap, eliminating the need for cross-layer welding, thus simplifying the welding process. The conductors connected in the same layer can also balance the slot potential of the branch, reducing circulating current losses between branches.

[0140] In some embodiments, the first conductor connected to the first input terminal U1+ is located in the 13th winding slot, and the 48th conductor connected to the first output terminal U1- is located in the 20th winding slot.

[0141] In some embodiments, the first conductor connected to the first input terminal U1+ and the 48th conductor connected to the first output terminal U1- are both layer a conductors. This embodiment is advantageous for busbar arrangement and facilitates the connection of the first input terminal U1+ and the first output terminal U1- to the external circuit.

[0142] In some embodiments, the stator includes eight magnetic poles, and correspondingly, the phase windings include eight pole phase groups. Multiple connectors 1022 of branch U1 are distributed across the eight pole phase groups, which can reduce branch potential imbalance caused by rotor eccentricity.

[0143] In some embodiments, the span between the conductor connected to the first input terminal of the first branch U1 and the conductor connected to the second input terminal of the second branch U2 is less than or equal to the pole pitch. This embodiment can reduce the distance between the input terminals of the two branches, facilitating the connection of the input terminals of the two branches and benefiting the arrangement of the busbar and the implementation of the winding processing technology.

[0144] For example, such as Figure 9 As shown, in the second branch U2, the positive terminal is the second incoming terminal, and the negative terminal is the second outgoing terminal. Figure 9In the diagram, U2+ represents the second incoming terminal, and U2- represents the second outgoing terminal.

[0145] The second incoming terminal U2+ is connected to conductor number 1, and the second outgoing terminal U2- is connected to conductor number 48.

[0146] In some embodiments, such as Figure 9 As shown, conductors 1-24 of the second branch U2 are connected in series. Conductors 1, 3, 5, and 7 are all f-layer conductors; conductors 2, 4, 6, and 8 are all e-layer conductors; conductors 9, 11, 13, and 15 are all d-layer conductors; conductors 10, 12, 14, and 16 are all c-layer conductors; conductors 17, 19, 21, and 23 are all b-layer conductors; and conductors 18, 20, 22, and 24 are all a-layer conductors.

[0147] In some embodiments, conductors 25-48 of the second branch are connected in series. Conductors 25, 27, 29, and 31 are all h-layer conductors. Conductors 26, 28, 30, and 32 are all e-layer conductors. Conductors 33, 35, 37, and 39 are all d-layer conductors. Conductors 34, 36, 38, and 40 are all c-layer conductors. Conductors 41, 43, 45, and 47 are all b-layer conductors. Conductors 42, 44, 46, and 48 are all a-layer conductors.

[0148] In some embodiments, the conductor connected to the first input terminal of the first branch U1 and the conductor connected to the second input terminal of the second branch U2 are disposed in the same winding groove 1011. This embodiment of the application draws the input terminals of the two branches from the same winding groove 1011, thereby further reducing the distance between the input terminals of the two branches, facilitating the connection of the input terminals of the two branches, and benefiting the arrangement of the busbar and the implementation of the winding processing technology.

[0149] In the embodiments of this application, conductors 24 and 25 of the second branch are both layer a conductors. The interconnected conductors in the same layer can also balance the slot potential of the branch, reducing circulating current losses between branches.

[0150] In some embodiments, the first conductor connected to the second incoming terminal U2+ is located in the 13th winding slot, and the 48th conductor connected to the second outgoing terminal U2- is located in the 20th winding slot.

[0151] In some embodiments, the first conductor connected to the second incoming terminal U2+ and the 48th conductor connected to the second outgoing terminal U2- are both layer a conductors. This embodiment is advantageous for busbar arrangement and facilitates the connection of the first incoming terminal U1+ and the first outgoing terminal U1- to the external circuit.

[0152] In some embodiments, the stator 10 includes eight magnetic poles, and correspondingly, the phase windings include eight pole phase groups. Multiple connectors 1022 of the second branch U2 are distributed across the eight pole phase groups, which can reduce branch potential imbalance caused by rotor eccentricity.

[0153] In some embodiments, the span between the conductor connected to the first input terminal of the first branch U1 and the conductor connected to the second input terminal of the second branch U2 is less than or equal to the pole pitch. This embodiment can reduce the distance between the input terminals of the two branches, facilitating the connection of the input terminals and benefiting the busbar arrangement and winding processing. The 24 connectors 1022 of the second branch U2 are also distributed across 8 pole phase groups. This embodiment can reduce the branch potential imbalance caused by rotor eccentricity.

[0154] In some embodiments, the multiple branches of the phase winding can be connected in series or in parallel. For example, the first branch U1 and the second branch U2 can be connected in series or in parallel.

[0155] like Figure 9 As shown, the first conductor of the first branch U1 is connected to the first incoming terminal U1+ of the first branch U1, and the first conductor of the second branch U2 is connected to the second outgoing terminal U2+ of the second branch U2. Optionally, the first conductor of the first branch U1 and the first conductor of the second branch U2 are located in the same winding slot 1011, i.e., winding slot 13. Leading the incoming terminals of the two branches out from the same winding slot 1011 further reduces the distance between the incoming terminals of the two branches, facilitating the connection of the incoming terminals of the two branches, and benefiting the busbar arrangement and winding processing.

[0156] In some embodiments, conductors 1 and 64 of the first branch U1 are both layer a conductors, and conductors 1 and 48 of the second branch U2 and the second branch U1 are both layer f conductors. This embodiment is advantageous for busbar arrangement and facilitates the connection of the two incoming terminals (U1+, U2+) and the two outgoing terminals (U1-, U2-) to the external circuit.

[0157] The U-phase winding shown in Figure 98 can balance the slot potential of each branch, reduce the circulating current loss between branches, reduce the electromotive force imbalance caused by rotor eccentricity, reduce the voltage stress on the conductors in the slot, and facilitate the arrangement of the busbars and the implementation of the winding processing technology. In this embodiment, the maximum voltage drop between adjacent conductors in the same winding slot can be reduced to 0.46U. ph (U ph (Phase voltage).

[0158] The embodiments of this application can be applied to windings with different numbers of layers, which is beneficial to broadening the voltage and power range of the windings.

[0159] Figure 10 This is a schematic diagram of three phase windings of a stator provided in some embodiments of this application. Figure 10 The U-phase, V-phase, and W-phase stator windings are shown. For ease of understanding, Figure 10 The three-phase stator windings are divided into three tables.

[0160] In some embodiments, all input terminals of the multiple phase windings are connected to conductors in different winding slots. This embodiment can increase the spacing between the input terminals and reduce interphase voltage stress.

[0161] In some embodiments, all the leads in the multiple phase windings are connected to conductors in different winding slots. This embodiment can increase the spacing between the leads and reduce interphase voltage stress.

[0162] In some embodiments, all incoming terminals and all outgoing terminals are connected to conductors in different winding slots. This embodiment can increase the spacing between the incoming terminals and the outgoing terminals, thereby reducing interphase voltage stress.

[0163] For example, such as Figure 10 As shown, the U-phase winding includes a first branch U1 and a second branch U2. U1+ represents the first incoming terminal of the first branch U1, and U1- represents the first outgoing terminal of the first branch U1. U2+ represents the second incoming terminal of the second branch U2, and U2- represents the second outgoing terminal of the second branch U2. Optionally, Figure 10 The U-phase winding can be made by Figure 11 The first branch U1 and the second branch U2 shown are combined to form the second branch.

[0164] The V-phase winding includes a first branch V1 and a second branch V2. V1+ represents the first incoming terminal of the first branch V1, and V1- represents the first outgoing terminal of the first branch V1. V2+ represents the second incoming terminal of the second branch V2, and V2- represents the second outgoing terminal of the second branch V2.

[0165] The W-phase winding includes a first branch W1 and a second branch W2. W1+ represents the first incoming terminal of the first branch W1, and W1- represents the first outgoing terminal of the first branch W1. W2+ represents the second incoming terminal of the second branch W2, and W2- represents the second outgoing terminal of the second branch W2.

[0166] In some embodiments, the 12 conductors connected to the terminals U1+, U1-, U2+, U2-, V1+, V1-, V2+, V2-, W1+, W1-, W2+, and W2- are respectively disposed in 12 winding slots.

[0167] In some embodiments, the six conductors connected to terminals U1+, U1-, U2+, U2-, V1+, and V1- are all layer a conductors. All of these terminals are located near the radially outer end of the stator core for easy welding.

[0168] In some embodiments, the 12 conductors connected to terminals U1+, U1-, U2+, U2-, V1+, V1-, V2+, V2-, W1+, W1-, W2+, and W2- are distributed within three adjacent magnetic poles, which is beneficial for the arrangement of the busbar.

[0169] like Figure 11 As shown, in some embodiments, the stator winding includes three phase windings: a U-phase winding, a V-phase winding, and a W-phase winding. Exemplarily, the three phase windings are connected in a delta configuration.

[0170] 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.

[0171] In the embodiments of this application, the inner wall of the stator core 101 has 12*N winding slots 1011, where N is a positive integer. The conductors of the first phase winding are distributed in 4*N winding slots. The second phase winding is distributed in 4*N winding slots, and the third phase winding is distributed in 4*N winding slots.

[0172] like Figure 12 As shown, in some embodiments, the stator winding includes three phase windings, namely the U-phase winding, the V-phase winding, and the W-phase winding. Wherein, N=4, and the U-phase winding, V-phase winding, and W-phase winding are distributed in 16 winding slots 1011.

[0173] Specifically, the U-phase windings are distributed in slots 1-2, 7-8, 13-14, 19-20, 25-26, 31-32, 37-38, and 43-44. The V-phase windings are distributed in slots 5-6, 11-12, 17-18, 23-24, 29-30, 35-36, 41-42, and 47-48. The W-phase windings are distributed in slots 3-4, 9-10, 15-16, 21-22, 27-28, 33-34, 39-40, and 45-46.

[0174] The above configuration can reduce the circulating current loss between the three phase windings and improve the conversion efficiency of the motor.

[0175] 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.

[0176] Figure 13 This is a schematic diagram showing the connection of the phase windings of the stator windings provided in other embodiments of this application.

[0177] like Figure 13 As shown, in some embodiments, the stator winding includes three phase windings: a U-phase winding, a V-phase winding, and a W-phase winding. Exemplarily, the three phase windings are connected in a delta configuration.

[0178] 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.

[0179] Figure 14 This is a schematic diagram showing the connection of the phase windings of the stator windings provided in some embodiments of this application.

[0180] like Figure 14 As shown, in some embodiments, the stator winding includes three phase windings: a U-phase winding, a V-phase winding, and a W-phase winding. Exemplarily, the three phase windings are connected in a star configuration. 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.

[0181] Reference Figures 11 to 14 The different stator windings shown can be adapted to different voltage and power level applications by changing the connection method of the phase windings and the connection method of the branches of the phase windings.

[0182] This application also provides an electric motor, which includes the stator provided in any of the foregoing embodiments. Exemplarily, the motor further includes a rotor disposed in the space formed by the inner wall of the stator core.

[0183] The motor in the embodiments of this application can be either a generator or an electric motor.

[0184] This application also provides an electrical device, which includes the motor provided in any of the foregoing embodiments.

[0185] In some embodiments, the electrical device includes a powertrain comprising a reducer and the aforementioned motor. The motor and reducer are connected by a transmission connection. Specifically, the drive shaft of the motor and the input shaft of the reducer can be connected by a transmission component such as a coupling to output driving force from the motor to the reducer.

[0186] This application also provides a vehicle, including the aforementioned powertrain, which is installed within the vehicle and provides power for its operation. Specifically, in this embodiment, the vehicle can be a new energy vehicle driven by electric power, such as a hybrid electric vehicle, a pure electric vehicle, or a fuel cell electric vehicle, or a vehicle that uses a high-efficiency energy storage device such as a supercapacitor, flywheel battery, or flywheel energy storage device as its power source.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions 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 this application.

[0188] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions 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 this application.

Claims

1. A stator for an electric motor, comprising a stator core and a stator winding disposed on the stator core, wherein the inner wall of the stator core has a plurality of winding slots, and the stator winding includes a plurality of conductors inserted into the winding slots. The stator winding includes a first phase winding, the first phase winding includes a first branch and a second branch, the first branch includes a first input terminal, a first output terminal and a plurality of conductors connected in series between the first input terminal and the first output terminal, and the second branch includes a second input terminal, a second output terminal and a plurality of conductors connected in series between the second input terminal and the second output terminal; The first input terminal and the second input terminal are respectively connected to conductors of different layers in the same winding groove; the first output terminal and the second output terminal are respectively connected to conductors of different layers in the same winding groove. In the first branch, along the direction from the first incoming terminal to the first outgoing terminal, at least two interconnected conductors are in the same layer. The first branch includes 2k conductors; along the direction from the first input terminal to the second input terminal, the first branch includes 2k conductors, denoted as A1, A2, ..., A... k A 2k-1 and A 2k ; A k The conductor and the Ath k+1 Each conductor is L n Layered conductor; The A1th conductor to the Ath conductor k A conductor runs along the first wave winding direction from layer L1 to layer L. n The layers are connected sequentially, the Ath layer... k+1 The conductor to the Ath 2k A conductor follows the second wave winding direction from L n Layer L1 is connected sequentially, and the first wave winding direction is opposite to the second wave winding direction.

2. The stator according to claim 1, wherein, The conductors in each of the winding slots are arranged in n layers, where n is a positive even number; along the direction from the bottom of the winding slot to the opening of the winding slot, the n layers of conductors are denoted as L1 layer, ..., L... i Layer, ... and L n Layer, 1≤i≤n; The first input terminal and the second input terminal are respectively connected to the L1 layer conductor and L in the same winding slot. n Layer conductor; the first output terminal and the second output terminal are respectively connected to the L1 layer conductor and L in the same winding groove. n Layered conductor.

3. The stator according to claim 2, wherein, Both the first branch and the second branch include multiple connectors connected in series, and each connector includes at least one conductor.

4. The stator according to claim 1, wherein, In the second branch, at least two conductors connected to each other are in the same layer along the direction from the second incoming end to the second outgoing end.

5. The stator according to claim 4, wherein, The second branch includes 2k conductors; along the direction from the second incoming terminal to the second outgoing terminal, the second branch includes 2k conductors, denoted as B1, B2, ..., B... k ... B 2k-1 and B 2k ; B k The conductor and the Bth conductor k+1 All conductors are L1 layer conductors; The B1st conductor to the Bth conductor k A conductor along the second winding direction from L n Layer B is connected sequentially from layer B to layer L1. k+1 The conductor to the Bth conductor 2k A conductor runs along the first winding direction from layer L1 to layer L. n The layers are connected sequentially.

6. The stator according to claim 5, wherein, The first phase winding includes 2p pole phase groups, where p is a positive integer; The plurality of conductors in the first branch are distributed in all of the pole groups, and the plurality of conductors in the second branch are distributed in all of the pole groups.

7. The stator according to claim 5 or 6, wherein, Within the winding grooves distributed in the first and second branches, the conductors of the first branch and the second branch are alternately arranged along the direction from the bottom of the winding groove to the opening of the winding groove.

8. The stator according to claim 5 or 6, wherein, Two conductors located in the same winding slot and adjacent to each other are denoted as A. x Layer and B y Layer, 1≤x≤y≤k, Where |yx|≤k.

9. The stator according to any one of claims 1-6, wherein, The inner wall of the stator core is provided with 12*N winding slots, where N is a positive integer; the conductors of the first phase winding are distributed in 4*N winding slots. The stator winding further includes a second phase winding and a third phase winding, the second phase winding being distributed in 4*N winding slots, and the third phase winding being distributed in 4*N winding slots.

10. An electric motor comprising a stator as claimed in any one of claims 1-9.

11. An electrical device comprising the motor as described in claim 10.

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