A stator assembly with balanced windings and an electric machine

Abstract

This invention relates to the field of electric motors, and particularly to a stator assembly and motor with balanced windings. Each stator slot contains six layers of rectangular conductors. The connection paths of the stator windings at the hairpin ends are as follows: conductor 1 is connected to conductor 1 in another stator slot using a combined span configuration; conductor 2 is connected to conductor 3 in another stator slot using a full-pitch span configuration; conductor 4 is connected to conductor 5 in another stator slot using a combined span configuration; and conductor 6 is connected to conductor 6 in another stator slot using a full-pitch span configuration. In this invention, the number of elements in each branch of each phase winding is the same, and the number of phase slots and layers traversed by each branch is also the same. This essentially achieves the same back EMF phase and magnitude in each branch, and the same resistance and inductance at the beginning and end of each branch, thus realizing a balanced arrangement of the three-phase windings.

Description

Technical Field

[0001] This invention belongs to the field of electric motors, and specifically relates to a stator assembly and motor with balanced windings. Background Technology

[0002] Flat wire motors have advantages such as high power density and low electromagnetic noise. However, as the operating speed of the motors increases, the AC loss problem of flat wire motors under high-frequency current operation is receiving more and more attention from the industry.

[0003] Three-phase flat-wire motor windings typically consist of multiple parallel branches. When the flat-wire rectangular conductors traversed by each branch winding are at different layers or phases, significant phase differences or inductance unevenness will occur between the branches, leading to circulating current problems. Circulating current problems in the winding branches are currently the most prominent issue causing high AC losses in flat-wire motors. Furthermore, new energy vehicle drive motors generally employ an 8-pole design. When the number of parallel branches in the motor windings is equal to 3, the industry has yet to find a good solution to ensure a balanced arrangement of the three-phase winding branches. Summary of the Invention

[0004] To address the above problems, the present invention provides a stator assembly with balanced windings, the stator assembly including a stator core and stator windings; the stator core has a plurality of stator slots arranged along its circumference, and each stator slot has 6 layers of rectangular conductors arranged therein, the layers of rectangular conductors in the same stator slot being arranged sequentially along the radial direction of the stator core;

[0005] The stator winding is a three-phase winding; the number of poles of the stator winding is 8 or a multiple of 8; the number of branches in each phase winding is 3 or a multiple of 3;

[0006] The connection path of the stator winding at the hairpin end is as follows: conductor 1 is connected to conductor 1 in another stator slot, and a combined span method is used; conductor 2 is connected to conductor 3 in another stator slot, and a full-pitch span method is used; conductor 4 is connected to conductor 5 in another stator slot, and a combined span method is used; conductor 6 is connected to conductor 6 in another stator slot, and a full-pitch span method is used.

[0007] The connection path of the stator winding at the welding end is as follows: conductor 1 is connected to conductor 2 in another stator slot, conductor 3 is welded to conductor 4 in another stator slot, conductor 5 is welded to conductor 6 in another stator slot, and all of them use the full-pitch span method.

[0008] Furthermore, the combined span refers to using two or more spans selected from the following: full span, first short span, second short span, first long span, and second long span; the calculation formulas for the full span, first short span, second short span, first long span, and second long span are as follows:

[0009] C1 = Z / P;

[0010] C2 = C1 - 2;

[0011] C3 = C1-1;

[0012] C4 = C1 + 1;

[0013] C5 = C1 + 2;

[0014] Where C1 is the full pitch, C2 is the first short pitch, C3 is the second short pitch, C4 is the first long pitch, C5 is the second long pitch, Z is the number of stator slots on the stator core, and P is the number of poles of the stator winding.

[0015] Furthermore, each of the branches is composed of one or more groups of small units connected in series and / or in parallel;

[0016] A group of the aforementioned small units comprises a small unit E, a small unit F, a small unit G, and a small unit H.

[0017] Furthermore, when the lead wire exits at the welding end, in the small unit E section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end;

[0018] In the small unit F section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end;

[0019] In the small unit G section, the stator winding adopts a span method combining full pitch and first short pitch at the hairpin end;

[0020] In the small unit H section, the stator winding adopts a span method of combining full pitch, first short pitch and second short pitch at the hairpin end.

[0021] Furthermore, when the lead wire exits at the welding end, in the small unit E section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end;

[0022] In the small unit F section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end;

[0023] In the small unit G section, the stator winding adopts a span method combining full pitch and first short pitch at the hairpin end;

[0024] In the small unit H section, the stator winding adopts a span method of combining full pitch, first short pitch, second short pitch and first long pitch at the starting end.

[0025] Furthermore, when the lead wire exits at the welding end, in the small unit E section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end;

[0026] In the small unit F section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end;

[0027] In the small unit G section, the stator winding adopts a span method combining full pitch and first short pitch at the hairpin end;

[0028] In the small unit H section, the stator winding adopts a span method of combining full pitch, first long pitch and second long pitch at the hairpin end.

[0029] Furthermore, when the lead wire exits at the card-out end, in the small unit E section, the stator winding only adopts the full-pitch span method at the card-out end;

[0030] In the small unit F section, the stator winding at the hairpin end only adopts the full-pitch span method;

[0031] In the small unit G section, the stator winding at the card-starting end only adopts the full-pitch span method;

[0032] In the small unit H section, the stator winding adopts a span method combining full pitch, second short pitch and first long pitch at the starting end.

[0033] Furthermore, when the lead wire exits at the card-out end, in the small unit E section, the stator winding only adopts the full-pitch span method at the card-out end;

[0034] In the small unit F section, the stator winding at the hairpin end only adopts the full-pitch span method;

[0035] In the small unit G section, the stator winding at the card-starting end only adopts the full-pitch span method;

[0036] In the small unit H section, the stator winding adopts a span method of combining full pitch, first short pitch and second short pitch at the hairpin end.

[0037] Furthermore, when the lead wire exits at the card-out end, in the small unit E section, the stator winding only adopts the full-pitch span method at the card-out end;

[0038] In the small unit F section, the stator winding at the hairpin end only adopts the full-pitch span method;

[0039] In the small unit G section, the stator winding at the card-starting end only adopts the full-pitch span method;

[0040] In the small unit H section, the stator winding adopts a span method of combining full pitch, first long pitch and second long pitch at the hairpin end.

[0041] The present invention also provides a motor having a balanced winding, the motor including the stator assembly described above.

[0042] The beneficial effects of this invention are:

[0043] 1. In this invention, the number of components in each branch of each phase winding is the same, and the number of phase slots and layers passed through each branch is the same. This basically achieves that the back EMF phase of each branch is the same, the magnitude is the same, and the resistance and inductance at the beginning and end of each branch are the same, thus realizing the balanced arrangement of the three-phase winding.

[0044] 2. In this invention, the stator assembly leads do not need to significantly occupy the end length of the stator winding, thus shortening the overall end length of the motor winding. Controlling the position of the motor leads within a small angle range, and eliminating jumpers or crossings between leads, facilitates the motor's structural layout and improves the manufacturability of the motor.

[0045] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 A schematic diagram of the stator assembly in an embodiment of the present invention is shown;

[0048] Figure 2 A cross-sectional schematic diagram of the stator slot in an embodiment of the present invention is shown;

[0049] Figure 3 A schematic diagram of the arrangement of all conductors in a stator slot in an embodiment of the present invention is shown;

[0050] Figure 4 This diagram illustrates the winding path of small unit E when the lead wire exits at the welding end in an embodiment of the present invention.

[0051] Figure 5 This diagram illustrates the winding path of the small unit F when the lead wire exits at the welding end in an embodiment of the present invention.

[0052] Figure 6 This diagram illustrates the winding path of the small unit G when the lead wire exits at the welding end in an embodiment of the present invention.

[0053] Figure 7 This diagram illustrates the winding path of small unit H1 when the lead wire exits at the welding end in an embodiment of the present invention.

[0054] Figure 8 This diagram illustrates the winding path of small unit H2 when the lead wire exits at the welding end in an embodiment of the present invention.

[0055] Figure 9 The diagram shows the winding path of small unit H3 when the lead wire exits at the welding end in an embodiment of the present invention;

[0056] Figure 10 This diagram illustrates the winding path of small unit E when the lead wire exits at the card issuing end in an embodiment of the present invention.

[0057] Figure 11 This diagram illustrates the winding path of the small unit F when the lead wire exits at the card issuing end in an embodiment of the present invention.

[0058] Figure 12 This diagram illustrates the winding path of the small unit G when the lead wire exits at the card issuing end in an embodiment of the present invention.

[0059] Figure 13 This diagram illustrates the winding path of small unit H1 when the lead wire exits at the card issuing end in an embodiment of the present invention.

[0060] Figure 14 This diagram illustrates the winding path of small unit H2 when the lead wire exits at the card issuing end in an embodiment of the present invention.

[0061] Figure 15 The diagram shows the winding path of small unit H3 when the lead wire exits at the card issuing end in an embodiment of the present invention. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] This invention provides a motor with balanced windings, the motor including a stator assembly.

[0064] Specifically, such as Figure 1 As shown, the stator assembly includes a stator core and a stator winding; the stator core is provided with a plurality of stator slots, which are arranged sequentially along the circumference of the stator core in a ring array; the stator winding is embedded in the stator slots, and the winding wires of the stator winding are rectangular conductors, which are evenly and symmetrically arranged in the stator slots.

[0065] Each stator slot contains six layers of rectangular conductors, and the layers of rectangular conductors within the same stator slot are arranged radially along the stator core. For ease of understanding, as follows: Figure 2 As shown, along the outer side of the stator core towards the center, the rectangular conductors in each layer within the same stator slot are sequentially labeled as conductor 1, conductor 2, conductor 3, conductor 4, conductor 5, and conductor 6. For ease of description of the specific winding path below, the conductors in the stator slot are arranged as follows: Figure 3 The arrangement and numbering are shown in the diagram.

[0066] The stator winding is a three-phase winding; the number of poles of the stator winding is 8 or a multiple of 8; the number of branches in each phase winding is 3 or a multiple of 3;

[0067] It should be noted that the stator winding can be divided into in-slot windings and end windings; the in-slot winding refers to the portion of the rectangular conductor located within the stator slot, and the end winding refers to the portion of the rectangular conductor located on both sides of the stator core. The function of the end windings is to pair and connect rectangular conductors at different positions within different stator slots at a certain span, thereby achieving internal connection of the stator windings. The end windings are distributed on both sides of the stator core and are respectively referred to as the hairpin end and the weld end.

[0068] Furthermore, the path of the stator winding on the stator core is determined by both the radial connection method of the windings in the stator core and the circumferential span method in the stator core. That is, different layer-slot configurations correspond to different winding paths.

[0069] Specifically, the path of the stator winding on the stator core includes: the connection path of the stator winding at the hairpin end and the connection path of the stator winding at the welding end.

[0070] Specifically, the connection path of the stator winding at the hairpin end is as follows: conductor 1 is connected to conductor 1 in another stator slot, and a combined span method is used; conductor 2 is connected to conductor 3 in another stator slot, and a full-pitch span method is used; conductor 4 is connected to conductor 5 in another stator slot, and a combined span method is used; conductor 6 is connected to conductor 6 in another stator slot, and a full-pitch span method is used.

[0071] The connection path of the stator winding at the welding end is as follows: conductor 1 is connected to conductor 2 in another stator slot, conductor 3 is welded to conductor 4 in another stator slot, conductor 5 is welded to conductor 6 in another stator slot, and all of them use the full-pitch span method.

[0072] Specifically, the combined span refers to using two or more spans selected from the following: full span, first short span, second short span, first long span, and second long span; the calculation formulas for the full span, first short span, second short span, first long span, and second long span are as follows:

[0073] C1 = Z / P;

[0074] C2 = C1 - 2;

[0075] C3 = C1-1;

[0076] C4 = C1 + 1;

[0077] C5 = C1 + 2;

[0078] Where C1 is the full pitch, C2 is the first short pitch, C3 is the second short pitch, C4 is the first long pitch, C5 is the second long pitch, Z is the number of stator slots on the stator core, and P is the number of poles of the stator winding.

[0079] The stator assembly proposed in this invention uses a lap winding connection method to achieve uniformity in the number of layers and slot phase of the windings of different branches in the same phase, thus achieving a balanced arrangement of each branch winding. In addition, it ensures that all motor leads or center point connection lines are in adjacent slots without special jumpers, giving the motor relatively good manufacturability.

[0080] For example, let's take a 72-slot, 3-phase, 8-pole winding as an example. The number of stator slots on the stator core is Z = 72, the number of poles in the stator winding is P = 8, and the number of phases in the stator winding is m = 3. Therefore, the number of slots per pole per phase is Q = Z / (P*m) = 3, the full pitch is C1 = Z / P = 9, the first short pitch is C2 = 7, the second short pitch is C3 = 8, the first long pitch is C4 = 10, and the second long pitch is C5 = 11.

[0081] For ease of understanding, each stator slot and the rectangular conductor within each stator slot are named sequentially along the circumference of the stator core. For example, such as... Figures 4-15 As shown in the figure, the labels represent the stator slot numbers, namely stator slot 1, stator slot 2, ..., stator slot 21. For ease of understanding, Z1(1) is defined as conductor 1 in stator slot 1, and Z2(3) is defined as conductor 3 in stator slot 2.

[0082] Specifically, the stator winding is a three-phase winding, namely W, V and U phase windings. According to the above-mentioned path arrangement of the stator winding on the stator core, each phase winding includes 3 or a multiple of 3 branches, and each branch is composed of one or more groups of small units connected in series and / or in parallel.

[0083] A group of the aforementioned small units comprises a small unit E, a small unit F, a small unit G, and a small unit H.

[0084] For example, when the lead wire exits at the soldering end, such as Figure 4 As shown, in the small unit E section, the stator winding adopts a span method combining full pitch C1 = 9 and first long pitch C4 = 10 at the hairpin end. The specific winding path of the small unit E is: Z10(2)→Z1(3)→Z10(4)→Z1(5)→Z10(6)→Z19(6)→Z10(5)→Z19(4)→Z10(3)→Z19(2)→Z10(1)→Z20(1).

[0085] like Figure 5 As shown, in the small unit F section, the stator winding adopts a span method combining the full pitch C1 = 9 and the first long pitch C4 = 10 at the hairpin end. The specific winding path of the small unit F is: Z11(2)→Z2(3)→Z11(4)→Z2(5)→Z11(6)→Z20(6)→Z11(5)→Z20(4)→Z11(3)→Z20(2)→Z11(1)→Z21(1).

[0086] like Figure 6 As shown, in the small unit G section, the stator winding adopts a span method of combining full pitch C1 = 9 and first short pitch C2 = 7 at the starting end. The specific winding path of the small unit G is: Z12(2)→Z3(3)→Z12(4)→Z3(5)→Z12(6)→Z21(6)→Z12(5)→Z21(4)→Z12(3)→Z21(2)→Z12(1)→Z19(1).

[0087] It should be noted that, in order to ensure that each branch meets the balance requirements, the specific winding path of the small unit H is divided into three types according to the specific situation, which are denoted as small unit H1, small unit H2, and small unit H3 respectively.

[0088] like Figure 7 As shown, in the small unit H1 section, the stator winding adopts a span method with a full pitch C1 = 9, a first short pitch C2 = 7, and a second short pitch C3 = 8 at the hairpin end. The specific winding path of the small unit H1 is: Z10(2)→Z1(3)→Z10(4)→Z2(5)→Z11(6)→Z20(6)→Z11(5)→Z21(4)→Z12(3)→Z21(2)→Z12(1)→Z19(1).

[0089] like Figure 8As shown, in the small unit H2 section, the stator winding adopts a span method at the hairpin end with a combination of full pitch C1=9, first short pitch C2=7, second short pitch C3=8 and first long pitch C4=10. The specific winding path of the small unit H2 is: Z11(2)→Z2(3)→Z11(4)→Z3(5)→Z12(6)→Z21(6)→Z12(5)→Z19(4)→Z10(3)→Z19(2)→Z10(1)→Z20(1).

[0090] like Figure 9 As shown, in the small unit H3 section, the stator winding adopts a span method combining full pitch C1=9, first long pitch C4=10 and second long pitch C5=11 at the hairpin end. The winding path of the small unit H3 is: Z12(2)→Z3(3)→Z12(4)→Z1(5)→Z10(6)→Z19(6)→Z10(5)→Z20(4)→Z11(3)→Z20(2)→Z11(1)→Z21(1).

[0091] For example, when the lead wire exits at the card issuing end, such as Figure 10 As shown, in the small unit E section, the stator winding at the hairpin end only adopts the full pitch C1 = 9 span method. The specific winding path of the small unit E is: Z1(1)→Z10(2)→Z1(3)→Z10(4)→Z1(5)→Z10(6)→Z19(6)→Z10(5)→Z19(4)→Z10(3)→Z19(2)→Z10(1).

[0092] like Figure 11 As shown, in the small unit F section, the stator winding at the hairpin end only adopts the full pitch C1 = 9 span method. The specific winding path of the small unit F is: Z2(1)→Z11(2)→Z2(3)→Z11(4)→Z2(5)→Z11(6)→Z20(6)→Z11(5)→Z20(4)→Z11(3)→Z20(2)→Z11(1).

[0093] like Figure 12 As shown, in the small unit G section, the stator winding at the hairpin end only adopts the full pitch C1 = 9 span method. The specific winding path of the small unit G is: Z3(1)→Z12(2)→Z3(3)→Z12(4)→Z3(5)→Z12(6)→Z21(6)→Z12(5)→Z21(4)→Z12(3)→Z21(2)→Z12(1).

[0094] Similarly, in order to ensure that each branch meets the balance requirement, the specific winding path of the small unit H is divided into three types according to the specific situation, which are denoted as small unit H1, small unit H2 and small unit H3 respectively.

[0095] like Figure 13As shown, in the small unit H1 section, the stator winding adopts a span method with a combination of full pitch C1 = 9, second short pitch C3 = 8 and first long pitch C4 = 10 at the hairpin end. The specific winding path of the small unit H1 is: Z1(1)→Z10(2)→Z1(3)→Z10(4)→Z2(5)→Z11(6)→Z20(6)→Z11(5)→Z21(4)→Z12(3)→Z21(2)→Z12(1).

[0096] like Figure 14 As shown, in the small unit H2 section, the stator winding adopts a span method of combining full pitch C1=9, first short pitch C2=7 and second short pitch C3=8 at the hairpin end. The specific winding path of the small unit H2 is: Z2(1)→Z11(2)→Z2(3)→Z11(4)→Z3(5)→Z12(6)→Z21(6)→Z12(5)→Z19(4)→Z10(3)→Z19(2)→Z10(1).

[0097] like Figure 15 As shown, in the small unit H3 section, the stator winding adopts a span method combining full pitch C1=9, first long pitch C4=10 and second long pitch C5=11 at the hairpin end. The winding path of the small unit H3 is: Z3(1)→Z12(2)→Z3(3)→Z12(4)→Z1(5)→Z10(6)→Z19(6)→Z10(5)→Z20(4)→Z11(3)→Z20(2)→Z11(1).

[0098] When the lead wire emerges at the card-out end, only the small unit H adopts a combined span method, while the other small units all adopt a full span method, making the forming process simpler.

[0099] The winding paths of the small units E, F, G, H1, H2 and H3 mentioned above only illustrate the winding paths under one pole. The actual complete stator winding requires the windings of each small unit to be moved and used in coordination in the circumferential direction. Furthermore, the winding paths within each small unit are all in a lap winding manner, which satisfies the requirements for balanced arrangement of the windings.

[0100] In the winding path of the stator assembly proposed in this embodiment of the invention, each branch is composed of four types of small units: E, F, G, and H.

[0101] Preferably, small unit E is followed by small unit F or small unit H2; small unit B is followed by small unit C or small unit H3; small unit C is followed by small unit H1 or small unit E; small unit H1 is followed by small unit E; small unit H2 is followed by small unit F; and small unit H3 is followed by small unit G. The winding path formed by this connection is the simplest and is beneficial to the motor structure layout.

[0102] An example is a schematic diagram of the U-phase winding wiring of a 72-slot 3-phase 8-stage stator assembly. Its lead-out wires are at the soldering ends. The U-phase winding consists of 3 branches, namely U1 branch, U2 branch and U3 branch.

[0103] The complete winding path of branch U1 is as follows: small unit E, small unit F, small unit G and small unit H1 are connected in series. The specific winding path is as follows: Z10(2)→Z1(3)→Z10(4)→Z1(5)→Z10(6)→Z19(6)→Z10(5)→Z19(4)→Z10(3)→Z19(2)→Z10(1)→Z20(1)→Z29(2)→Z20(3)→Z29(4)→Z20(5)→Z29(6)→Z38(6)→Z29(5)→Z38(4)→Z29(3)→Z38(2)→Z29(1)→Z 39(1)→Z48(2)→Z39(3)→Z48(4)→Z39(5)→Z48(6)→Z57(6)→Z48(5)→Z57(4)→Z48(3)→Z57(2)→Z48(1)→Z55(1)→Z64(2)→Z55(3)→Z64(4)→Z56(5)→Z65(6)→Z2(6)→Z65(5)→Z3(4)→Z66(3)→Z3(2)→Z66(1)→Z1(1).

[0104] The complete winding path of branch U2 is: small unit F, small unit G, small unit E and small unit H2 are connected in series. The specific winding path is as follows: Z11(2)→Z2(3)→Z11(4)→Z2(5)→Z11(6)→Z20(6)→Z11(5)→Z20(4)→Z11(3)→Z20(2)→Z11(1)→Z21(1)→Z30(2)→Z21(3)→Z30(4)→Z21(5)→Z30(6)→Z39(6)→Z30(5)→Z39(4)→Z30(3)→Z39(2)→Z30(1)→Z 37(1)→Z46(2)→Z37(3)→Z46(4)→Z37(5)→Z46(6)→Z55(6)→Z46(5)→Z55(4)→Z46(3)→Z55(2)→Z46(1)→Z56(1)→Z65(2)→Z56(3)→Z65(4)→Z57(5)→Z66(6)→Z3(6)→Z66(5)→Z1(4)→Z64(3)→Z1(2)→Z64(1)→Z2(1).

[0105] The complete winding path of branch U3 is: small unit G, small unit E, small unit F and small unit H3 are connected in series. The specific winding path is as follows: Z12(2)→Z3(3)→Z12(4)→Z3(5)→Z12(6)→Z21(6)→Z12(5)→Z21(4)→Z12(3)→Z21(2)→Z12(1)→Z19(1)→Z28(2)→Z19(3)→Z28(4)→Z19(5)→Z28(6)→Z37(6)→Z28(5)→Z37(4)→Z28(3)→Z37(2)→Z28(1)→Z 38(1)→Z47(2)→Z38(3)→Z47(4)→Z38(5)→Z47(6)→Z56(6)→Z47(5)→Z56(4)→Z47(3)→Z56(2)→Z47(1)→Z57(1)→Z66(2)→Z57(3)→Z66(4)→Z55(5)→Z64(6)→Z1(6)→Z64(5)→Z2(4)→Z65(3)→Z2(2)→Z65(1)→Z3(1).

[0106] For example, the wiring diagram of the U-phase winding of a 72-slot 3-phase 8-level stator assembly is shown. Its lead wire is at the hairpin end. The U-phase winding consists of 3 branches, namely U1 branch, U2 branch and U3 branch.

[0107] The complete winding path of branch U1 is as follows: small unit E, small unit F, small unit G and small unit H1 are connected in series. The specific winding path is as follows: Z1(1)→Z10(2)→Z1(3)→Z10(4)→Z1(5)→Z10(6)→Z19(6)→Z10(5)→Z19(4)→Z10(3)→Z19(2)→Z10(1)→Z20(1)→Z29(2)→Z20(3)→Z29(4)→Z20(5)→Z29(6)→Z38(6)→Z29(5)→Z38(4)→Z29(3)→Z38(2)→Z2 9(1)→Z39(1)→Z48(2)→Z39(3)→Z48(4)→Z39(5)→Z48(6)→Z57(6)→Z48(5)→Z57(4)→Z48(3)→Z57(2)→Z48(1)→Z55(1)→Z64(2)→Z55(3)→Z64(4)→Z56(5)→Z65(6)→Z2(6)→Z65(5)→Z3(4)→Z66(3)→Z3(2)→Z66(1).

[0108] The complete winding path of branch U2 is: small unit F, small unit G, small unit E and small unit H2 are connected in series. The specific winding path is as follows: Z2(1)→Z11(2)→Z2(3)→Z11(4)→Z2(5)→Z11(6)→Z20(6)→Z11(5)→Z20(4)→Z11(3)→Z20(2)→Z11(1)→Z21(1)→Z30(2)→Z21(3)→Z30(4)→Z21(5)→Z30(6)→Z39(6)→Z30(5)→Z39(4)→Z30(3)→Z39(2)→Z3 0(1)→Z37(1)→Z46(2)→Z37(3)→Z46(4)→Z37(5)→Z46(6)→Z55(6)→Z46(5)→Z55(4)→Z46(3)→Z55(2)→Z46(1)→Z56(1)→Z65(2)→Z56(3)→Z65(4)→Z57(5)→Z66(6)→Z3(6)→Z66(5)→Z1(4)→Z64(3)→Z1(2)→Z64(1).

[0109] The complete winding path of branch U3 is: small unit G, small unit E, small unit F and small unit H3 are connected in series. The specific winding path is as follows: Z3(1)→Z12(2)→Z3(3)→Z12(4)→Z3(5)→Z12(6)→Z21(6)→Z12(5)→Z21(4)→Z12(3)→Z21(2)→Z12(1)→Z19(1)→Z28(2)→Z19(3)→Z28(4)→Z19(5)→Z28(6)→Z37(6)→Z28(5)→Z37(4)→Z28(3)→Z37(2)→Z2 8(1)→Z38(1)→Z47(2)→Z38(3)→Z47(4)→Z38(5)→Z47(6)→Z56(6)→Z47(5)→Z56(4)→Z47(3)→Z56(2)→Z47(1)→Z57(1)→Z66(2)→Z57(3)→Z66(4)→Z55(5)→Z64(6)→Z1(6)→Z64(5)→Z2(4)→Z65(3)→Z2(2)→Z65(1).

[0110] It should be noted that when the lead wires are located at the hairpin end, all lead wires of the stator assembly are located at conductor 1; when the lead wires are located at the solder end, all lead wires of the stator assembly are located at conductors 1 and 2. This design ensures that the lead wires of the stator assembly do not significantly occupy the length of the motor winding ends, thus shortening the overall length of the motor winding ends. Controlling the position of the motor lead wires within a small angle range, and eliminating jumpers or crossings between lead wires, facilitates the motor's structural layout and provides relatively good manufacturability.

[0111] In the stator assembly proposed in this embodiment of the invention, the number of elements in each branch of each phase winding is the same, and the number of phase slots and layers passed through each branch is the same. This basically achieves that the back EMF phase of each branch is the same, the magnitude is the same, and the resistance and inductance at the beginning and end of each branch are the same, thus realizing the balanced arrangement of the three-phase winding.

[0112] It should be noted that when the number of poles in the stator assembly is a multiple of 8, each branch still consists of four types of small units: E, F, G, and H. For example, when the number of poles in the stator assembly is 16, each branch consists of two sets of small units connected in series and / or in parallel; when the number of poles in the stator assembly is 24, each branch consists of three sets of small units connected in series and / or in parallel; these details will not be elaborated further here.

[0113] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and 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 the present invention.

Claims

1. A stator assembly with balanced windings, characterized in that, The stator assembly includes a stator core and a stator winding; the stator core has multiple stator slots arranged along its circumference, and each stator slot contains 6 layers of rectangular conductors, with the layers of rectangular conductors in the same stator slot arranged sequentially along the radial direction of the stator core; The stator winding is a three-phase winding; the number of poles of the stator winding is a multiple of 8; the number of branches in each phase winding is a multiple of 3; The connection path of the stator winding at the hairpin end is as follows: conductor 1 is connected to conductor 1 in another stator slot, and a combined span method is used; conductor 2 is connected to conductor 3 in another stator slot, and a full-pitch span method is used; conductor 4 is connected to conductor 5 in another stator slot, and a combined span method is used; conductor 6 is connected to conductor 6 in another stator slot, and a full-pitch span method is used. The connection path of the stator winding at the welding end is as follows: conductor 1 is connected to conductor 2 in another stator slot, conductor 3 is welded to conductor 4 in another stator slot, conductor 5 is welded to conductor 6 in another stator slot, and all of them use the full-pitch span method.

2. A stator assembly with balanced windings according to claim 1, characterized in that, The combined span refers to the use of two or more spans selected from the following: full span, first short span, second short span, first long span, and second long span; the calculation formulas for the full span, first short span, second short span, first long span, and second long span are as follows: C1 = Z / P; C2 = C1 - 2; C3 = C1-1; C4 = C1 + 1; C5 = C1 + 2; Where C1 is the full pitch, C2 is the first short pitch, C3 is the second short pitch, C4 is the first long pitch, C5 is the second long pitch, Z is the number of stator slots on the stator core, and P is the number of poles of the stator winding.

3. A stator assembly with balanced windings according to claim 2, characterized in that, Each of the branches is composed of one or more groups of small units connected in series and / or in parallel. A group of the aforementioned small units comprises a small unit E, a small unit F, a small unit G, and a small unit H.

4. A stator assembly with balanced windings according to claim 3, characterized in that, When the lead wire exits at the welding end, in the small unit E section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end. In the small unit F section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end; In the small unit G section, the stator winding adopts a span method combining full pitch and first short pitch at the hairpin end; In the small unit H section, the stator winding adopts a span method of combining full pitch, first short pitch and second short pitch at the hairpin end.

5. A stator assembly with balanced windings according to claim 3, characterized in that, When the lead wire exits at the welding end, in the small unit E section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end. In the small unit F section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end; In the small unit G section, the stator winding adopts a span method combining full pitch and first short pitch at the hairpin end; In the small unit H section, the stator winding adopts a span method of combining full pitch, first short pitch, second short pitch and first long pitch at the starting end.

6. A stator assembly with balanced windings according to claim 3, characterized in that, When the lead wire exits at the welding end, in the small unit E section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end. In the small unit F section, the stator winding adopts a span method combining full pitch and first long pitch at the hairpin end; In the small unit G section, the stator winding adopts a span method combining full pitch and first short pitch at the hairpin end; In the small unit H section, the stator winding adopts a span method of combining full pitch, first long pitch and second long pitch at the hairpin end.

7. A stator assembly with balanced windings according to claim 3, characterized in that, When the lead wire emerges at the card-out end, in section E of the small unit, the stator winding only adopts the full-pitch span method at the card-out end; In the small unit F section, the stator winding at the hairpin end only adopts the full-pitch span method; In the small unit G section, the stator winding at the card-starting end only adopts the full-pitch span method; In the small unit H section, the stator winding adopts a span method combining full pitch, second short pitch and first long pitch at the starting end.

8. A stator assembly with balanced windings according to claim 3, characterized in that, When the lead wire emerges at the card-out end, in section E of the small unit, the stator winding only adopts the full-pitch span method at the card-out end; In the small unit F section, the stator winding at the hairpin end only adopts the full-pitch span method; In the small unit G section, the stator winding at the card-starting end only adopts the full-pitch span method; In the small unit H section, the stator winding adopts a span method of combining full pitch, first short pitch and second short pitch at the hairpin end.

9. A stator assembly with balanced windings according to claim 3, characterized in that, When the lead wire emerges at the card-out end, in section E of the small unit, the stator winding only adopts the full-pitch span method at the card-out end; In the small unit F section, the stator winding at the hairpin end only adopts the full-pitch span method; In the small unit G section, the stator winding at the card-starting end only adopts the full-pitch span method; In the small unit H section, the stator winding adopts a span method of combining full pitch, first long pitch and second long pitch at the hairpin end.

10. A motor having a balanced winding, characterized in that, The motor includes the stator assembly described in any one of claims 1-9.

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