Motor stator winding, stator and motor

Abstract

The present invention provides a motor stator winding, comprising a first coil group and a second coil group, wherein the first coil group is connected to the second coil group, and at least one of the second coil groups and the lead-out terminal is in the same radial direction of the stator core; the second coil group comprises at least one adjacent deformed coil group and a second deformed coil group, wherein the first and second deformed coil groups are arranged in sequence along the radial direction of the stator core, and are both arranged in two adjacent radial layers of the stator core. The first and second deformed coil groups are different types of hairpin coils, wherein the first deformed coil group is a long-distance conductor and the second deformed coil group is a short-distance conductor, or the first deformed coil group is a short-distance conductor and the second deformed coil group is a long-distance conductor. The present invention has the beneficial effect of achieving a completely symmetrical stator winding structure in the magnetic circuit, eliminating the problem of circulating current caused by an asymmetric structure and reducing torque ripple.

Description

Technical Field

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

[0002] In the prior art, stator windings consist of multiple types of conductor coils, which are inserted into the slots of the stator core in a specific arrangement to form the windings for single-phase or multi-phase motors. The hairpin coils used in prior art come in a wide variety of shapes and complex arrangements, requiring numerous busbars and busbars to connect the branches and neutral points of each phase winding. This results in a complex manufacturing process, high production costs, and low processing efficiency. Summary of the Invention

[0003] In view of the above problems, the present invention provides a motor stator winding, a stator and a motor to solve the above or other problems existing in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a motor stator winding, comprising:

[0005] Coil group one and coil group two, coil group one is connected to coil group two, and at least one coil group two and a lead-out wire end are in the same radial direction of the stator core;

[0006] Coil group 2 includes at least adjacently arranged deformed coil 1 and deformed coil 2, which are arranged in sequence along the radial direction of the stator core. Deformed coil 1 and deformed coil 2 are both arranged in two adjacent radial layers of the stator core, and deformed coil 1 and deformed coil 2 are different types of hairpin coils, wherein deformed coil 1 is a long-distance conductor and deformed coil 2 is a short-distance conductor, or, deformed coil 1 is a short-distance conductor and deformed coil 2 is a long-distance conductor.

[0007] Furthermore, the coil group 2 also includes at least a deformed coil 3, which is arranged adjacent to the deformed coil 2. The deformed coil 3 and the deformed coil 2 are different types of hairpin coils, and the deformed coil 3 is a long-spacing conductor group or a long-spacing conductor.

[0008] Furthermore, the coil group 2 also includes at least a deformed coil 3, which is arranged adjacent to the deformed coil 2. The deformed coil 3 and the deformed coil 2 are different types of hairpin coils, and the deformed coil 3 is a whole short-distance conductor group or a short-distance conductor.

[0009] Furthermore, the lead-out wire ends are arranged at the radial innermost layer and / or outermost layer of the stator core.

[0010] Furthermore, the long full-pitch conductor group includes a first long-pitch conductor and a first full-pitch conductor, the first long-pitch conductor is arranged outside the first full-pitch conductor, and the long-pitch conductor is a second long-pitch conductor.

[0011] Furthermore, the pitch of the first long-pitch conductor is 8, the pitch of the first full-pitch conductor is 6, and the pitch of the second long-pitch conductor is 7.

[0012] Furthermore, the full-short pitch conductor group includes a second full-pitch conductor and a first short-pitch conductor, the second full-pitch conductor is arranged outside the first short-pitch conductor, and the short-pitch conductor is the second short-pitch conductor.

[0013] Furthermore, the pitch of the second full-pitch conductor is 6, the pitch of the first short-pitch conductor is 4, and the pitch of the second short-pitch conductor is 5.

[0014] Furthermore, the number of radial layers of the stator core is an even number greater than or equal to 6, and the number of coil groups 2 is an even number greater than or equal to 2.

[0015] Furthermore, coil group one includes multiple hairpin coils, which are arranged in sequence along the circumference of the stator core. The multiple hairpin coils of coil group one are concentrically arranged. The hairpin coils are the third conductor group. The third conductor group is arranged in two radially adjacent layers of the stator core. The third conductor group includes a third long pitch conductor and a third short pitch conductor. The third long pitch conductor is arranged around the outside of the third short pitch conductor. The pitch of the third long pitch conductor is 7, and the pitch of the third short pitch conductor is 5.

[0016] Furthermore, the four branches of the hairpin coils in each phase of the stator winding are connected in parallel; or, at least two branches of the hairpin coils in each phase of the stator winding are connected in parallel, and the lead ends of one group of two branches in the four branches are connected to the output ends of another group of two branches, and the connection method is a concentric structure connection or a full-pitch structure connection.

[0017] A motor stator comprises the above-mentioned motor stator winding and a stator core, wherein the motor stator winding is arranged on the stator core.

[0018] A motor comprises the above-mentioned motor stator.

[0019] Due to the adoption of the above technical solution, the stator winding structure adopts a completely symmetrical structure on the magnetic circuit, and has coil group one and coil group two. Coil group one adopts a conductor group with the same structure. In coil group two, adjacent coils adopt different types of hairpin coils, one coil is a long-distance conductor, and the other coil is a short-distance conductor. At least one coil group two and the lead wire end are in the same radial direction as the stator core, so that the stator winding structure has a completely symmetrical structure on the magnetic circuit, eliminating the loop current problem caused by the asymmetric structure, reducing torque fluctuation, reducing harmonics, reducing noise, simplifying the arrangement, reducing the use of busbars and bus bars, and simplifying the branch and neutral point connection method of each phase winding, simplifying the manufacturing process, reducing production costs, and improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic diagram of the stator structure of embodiment 1 of the present invention;

[0021] Figure 2 1 is a schematic diagram of a single-phase winding structure of a stator winding according to a first embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a third conductor group in some embodiments of the present invention;

[0023] Figure 4 is a schematic structural diagram of a long full-spacing conductor group according to some embodiments of the present invention;

[0024] Figure 5 is a schematic structural diagram of an entire short-distance conductor group according to some embodiments of the present invention;

[0025] Figure 6 is a schematic structural diagram of a short-distance conductor in some embodiments of the present invention;

[0026] Figure 7 is a schematic structural diagram of a long-distance conductor in some embodiments of the present invention;

[0027] Figure 8 This is a planar expansion diagram of the plug-in terminal when one phase and four branches are connected in parallel according to the first embodiment of the present invention;

[0028] Figure 9 This is a planar expansion diagram of the welding end when one phase and four branches are connected in parallel according to the first embodiment of the present invention;

[0029] Figure 10 This is a planar expansion diagram of the plug-in terminal when one phase and two branches are connected in parallel (the lead-out terminal is connected in a full-pitch structure) according to the first embodiment of the present invention;

[0030] Figure 11 1 is a planar expansion diagram of the plug-in terminal when one phase and two branches are connected in parallel (the lead-out terminal is connected in a concentric structure) according to the first embodiment of the present invention;

[0031] Figure 12 This is a planar expansion diagram of the plug-in terminal when one phase and four branches are connected in parallel according to the third embodiment of the present invention;

[0032] Figure 13 This is a planar expansion diagram of the plug-in terminal when one phase and two branches are connected in parallel in the third embodiment of the present invention (the lead-out terminal is connected in a full-pitch structure);

[0033] Figure 14 1 is a planar expansion diagram of the plug-in terminal when one phase and two branches are connected in parallel according to the third embodiment of the present invention (the lead-out terminal is connected in a concentric structure);

[0034] Figure 15This is a schematic diagram of a star connection circuit when two branches are connected in parallel in some embodiments of the present invention;

[0035] Figure 16 This is a schematic diagram of a triangle connection circuit when two branches are connected in parallel in some embodiments of the present invention;

[0036] Figure 17 This is a schematic diagram of a star connection circuit when four branches are connected in parallel in some embodiments of the present invention;

[0037] Figure 18 This is a schematic diagram of a triangle connection circuit when four branches are connected in parallel in some embodiments of the present invention;

[0038] Figure 19 1 is a schematic structural diagram of the B-type insulating paper of some embodiments of the present invention when installed in the slots of the stator core;

[0039] Figure 20 1 is a schematic structural diagram of an S-shaped insulating paper installed in a slot of a stator core according to some embodiments of the present invention;

[0040] Figure 21 Schematic diagram of the structure of the die-shaped insulating paper when installed in the slots of the stator core according to some embodiments of the present invention.

[0041] In the picture:

[0042] 10. Stator winding 20, stator core 200, third conductor group

[0043] 210, long distance conductor group 220, short distance conductor group 230, short distance conductor

[0044] 240, long-distance conductor 250, lead-out terminal U11, U1 phase lead-out terminal

[0045] U12, U1 phase outgoing line terminal U21, U2 phase lead terminal U22, U2 phase outgoing line terminal

[0046] U31, U3 phase lead terminal U32, U3 phase lead terminal U41, U4 phase lead terminal

[0047] U42, U4 phase outlet terminal 200A, third long pitch conductor 200B, third short pitch conductor

[0048] 210A, first long pitch conductor 210B, first full pitch conductor 220A, second full pitch conductor

[0049] 220B, first short-pitch conductor 21, slot 30, insulating paper DETAILED DESCRIPTION

[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0051] Figure 1-21 The present invention shows a schematic structural diagram of some embodiments of the present invention, specifically showing the structure of each embodiment. Each embodiment relates to a motor stator winding, a stator and a motor. The structure of the stator winding adopts a completely symmetrical structure in the magnetic circuit, eliminating the circulating current problem caused by the asymmetric structure, reducing torque fluctuations, reducing noise, simplifying the manufacturing process, reducing production costs and improving processing efficiency.

[0052] A motor stator winding 10, such as Figure 1-7 As shown, a multi-phase winding structure is formed by a plurality of hairpin coils arranged in sequence along the circumference of the stator core 20 according to a certain arrangement rule. Specifically, the motor stator winding 10 includes:

[0053] The lead wire terminal 250 is arranged at the radial innermost layer and / or outermost layer of the stator core 20. The lead wire terminal 250 can be arranged at the radial innermost layer of the stator core 20, or the lead wire terminal 250 can be arranged at the radial outermost layer of the stator core 20, or the lead wire terminal 250 can be arranged at the radial innermost layer and outermost layer of the stator core 20, according to actual needs.

[0054] The lead-out terminal 250 includes a plurality of S-shaped conductors, which are composed of S-shaped conductors. The S-shaped conductor includes a slot interior and two slot exterior ends. The slot interior is arranged in the slot of the stator core 20. The two slot exterior ends are located at the axial ends of the stator core 20, and the two slot exterior ends are respectively connected to the two ends of the slot interior. Among the two slot exterior ends, one is a lead end or an outlet end, and the other slot exterior end is connected to the adjacent welding end. The positions of the lead end and the outlet end can be interchanged. The two slot exterior ends extend along the circumference of the stator core 20, and the extension directions of the two slot exterior ends are opposite, so that the lead-out terminal 250 is S-shaped. The lead ends or outlet ends of the plurality of lead-out terminals 250 are located at one axial end of the stator core 20.

[0055] The motor stator winding 10 also includes: coil group 1 and coil group 2, coil group 1 is connected to coil group 2, coil group 1 and coil group 2 are arranged in sequence along the circumference of the stator core 20, at least one coil group 2 and the lead end 250 are in the same radial direction of the stator core 20, the number of coil groups 2 is an even number greater than or equal to 2, when the number of coil groups 2 is an even number greater than or equal to 2, the position of at least one coil group 2 is set to be in the same radial direction of the stator core 20 as the lead end 250, and multiple coil groups 2 are connected to coil group 1, and multiple coil groups 2 are symmetrically arranged.

[0056] The stator winding 10 is composed of coil group one and coil group two. Coil group one is composed of hairpin coils of the same structure, and coil group two is composed of hairpin coils different from coil group one. The type of hairpin coil of coil group one is different from the type of hairpin coil of coil group two. The hairpin coil of coil group one and the hairpin coil of coil group two are both U-shaped conductors. The U-shaped conductor has two welding ends for welding and connecting with adjacent hairpin coils, two slots and one wire-insertion end. One end of the two slots is respectively connected to the two welding ends, and the other end of the two slots is respectively connected to the wire-insertion end to form a U-shaped conductor structure. According to the needs of the preparation of the stator winding 10, U-shaped conductors with similar structures but different pitches are selected to construct the structure of coil group one and the structure of coil group two, so that the stator winding 10 is completely symmetrical in structure on the magnetic circuit.

[0057] In multiple embodiments of the present application, the two welding ends of the U-shaped conductor extend along the circumference of the stator core 20, and the extension directions are toward each other, that is, the extension directions are opposite and close to each other, or the extension directions are in opposite directions, that is, the extension directions are opposite and away from each other.

[0058] The above-mentioned coil group 1 includes multiple hairpin coils, which are arranged in sequence along the circumference of the stator core 20. The multiple hairpin coils of coil group 1 are concentrically arranged. The hairpin coils are a third conductor group 200 with the same structure. The third conductor group 200 is arranged in two radially adjacent layers of the stator core 20. The hairpin coils of coil group 1 are arranged in sequence along the radial layers of the stator core 20 and are arranged in all layers of the stator core 20.

[0059] The third conductor group 200 includes a third long-pitch conductor 200A and a third short-pitch conductor 200B. The third long-pitch conductor 200A is arranged outside the third short-pitch conductor 200B. Preferably, the pitch of the third long-pitch conductor 200A is 7, and the pitch of the third short-pitch conductor 200B is 5.

[0060] The above-mentioned coil group 2 includes at least adjacently arranged deformed coil 1 and deformed coil 2. The deformed coil 1 and the deformed coil 2 are arranged in sequence along the radial direction of the stator core 20. The deformed coil 1 and the deformed coil 2 are both arranged in two adjacent radial layers of the stator core 20. The coil group 1 and the coil group 2 are concentrically arranged, and the deformed coil 1 and the deformed coil 2 are different types of hairpin coils. The deformed coil 1 is a long-distance conductor 240, and the deformed coil 2 is a short-distance conductor 230, or the deformed coil 1 is a short-distance conductor 230, and the deformed coil 2 is a long-distance conductor 240. The selection is made according to actual needs.

[0061] When coil group two and the lead wire end 250 are in the same radial direction of the stator core 20, coil group two is arranged in each radial layer of the stator core 20 except the layer where the lead wire end 250 is located; when coil group two and the lead wire end 250 are not in the same radial direction of the stator core 20, coil group two is arranged in each radial layer of the stator core 20.

[0062] The coil group 2 at least includes a deformed coil 3, which is adjacent to the deformed coil 2. The deformed coil 3 and the deformed coil 2 are different types of hairpin coils. The deformed coil 3 is a long-spacing conductor group 210 or a long-spacing conductor 240 .

[0063] Alternatively, coil group 2 further includes at least deformed coil 3, which is adjacent to deformed coil 2. Deformed coil 3 and deformed coil 2 are different types of hairpin coils, and deformed coil 3 is the entire short-distance conductor group 220 or the short-distance conductor 230.

[0064] That is, in coil group two, there are multiple deformed coils, and the multiple deformed coils are arranged in sequence along the radial direction of the stator core 20, and the two adjacent groups of deformed coils are different types of hairpin coils. Here, the adjacent deformed coils are different types of hairpin coils, which means that one is a long-distance type hairpin coil and the other is a short-distance type hairpin coil, that is, one group of deformed coils is a long-distance conductor group 210 or a long-distance conductor 240, and the other group of deformed coils is a short-distance conductor group 220 or a short-distance conductor 230, which are selected and set according to actual needs.

[0065] The long full-pitch conductor group 210 includes a first long pitch conductor 210A and a first full-pitch conductor 210B. The first long pitch conductor 210A is arranged outside the first full-pitch conductor 210B. Preferably, the pitch of the first long pitch conductor 210A is 8, and the pitch of the first full-pitch conductor 210B is 6.

[0066] The long-pitch conductor 240 is a second long-pitch conductor. Preferably, the pitch of the second long-pitch conductor is 7.

[0067] The above-mentioned full-short pitch conductor group 220 includes a second full-pitch conductor 220A and a first short-pitch conductor 220B. The second full-pitch conductor 220A is arranged outside the first short-pitch conductor 220B. Preferably, the pitch of the second full-pitch conductor 220A is 6, and the pitch of the first short-pitch conductor 220B is 4.

[0068] The short-pitch conductor 230 is a second short-pitch conductor. Preferably, the pitch of the second short-pitch conductor is 5.

[0069] The number of radial layers of the stator core 20 is an even number greater than or equal to 6, and is selected according to actual needs. When the number of radial layers of the stator core 20 is 6, the coil group 2 includes at least a deformed coil 1 and a deformed coil 2, and the deformed coil 1 and the deformed coil 2 are arranged in sequence from the inside to the outside along the radial direction of the stator core 20, or from the outside to the inside. When the number of radial layers of the stator core 20 is greater than 6, the coil group 2 includes at least three or more groups of deformed coils, which are arranged in sequence from the inside to the outside along the radial direction of the stator core 20, or from the outside to the inside. Adjacent deformed coils are different types of hairpin coils, such as: deformed coil 1 is a long-distance conductor 240, and deformed coil 2 is a short-distance conductor. The deformed coil 1 is a long full-spacing conductor group 210 or a long-spacing conductor 230, the deformed coil 2 is a long full-spacing conductor group 210 or a long-spacing conductor 240, the deformed coil 3 is a long full-spacing conductor group 210 or a long-spacing conductor 240, the deformed coil 4 is a long full-spacing conductor group 210 or a long-spacing conductor 240, the deformed coil 5 is a long full-spacing conductor group 210 or a long-spacing conductor 240, and so on, which are arranged in sequence; or, the deformed coil 1 is a short-spacing conductor 230, the deformed coil 2 is a long-spacing conductor 240, the deformed coil 3 is a short-spacing conductor group 220 or a short-spacing conductor 230, the deformed coil 4 is a long full-spacing conductor group 210 or a long-spacing conductor 240, the deformed coil 5 is a short-spacing conductor group 220 or a short-spacing conductor 230, and so on, which are arranged in sequence.

[0070] The multiple hairpin coils in each phase of the stator winding 10 are connected in parallel in four branches; or, the multiple hairpin coils in each phase of the stator winding 10 are connected in parallel in at least two branches. When two branches are connected in parallel, the lead ends of two branches in one group of the four branches are connected to the lead ends of two branches in another group of the four branches. The connection method is to adopt a concentric structure connection or a full pitch structure connection. Specifically, Figure 15-16 As shown, in the stator winding 10, at least two branches of the multiple hairpin coils in each phase are connected in parallel, and the lead ends of one group of two branches in the four branches are connected to the output ends of another group of two branches. The connection method is a concentric structure connection or a full-pitch structure connection. The connection method of the two branches in parallel is a star connection method or a triangle connection method. The lead end 250 has two lead ends and two output ends.

[0071] Or, as Figure 17-18 As shown, in the stator winding 10, the plurality of hairpin coils in each phase are connected in four branches in parallel, and the four branches are connected in parallel in a star connection or a triangle connection. The lead-out terminal 250 has four lead-out terminals and four outlet terminals.

[0072] Because the lead-out terminals 250 are formed of S-shaped conductors, when the four branches of multiple hairpin coils in each phase are connected in parallel, the U1-phase lead-out terminals U11 and U2-phase lead-out terminals U21 of two branches are located on one layer of the stator core 20, while the U1-phase outlet terminals U12 and U2-phase outlet terminals U22 are located on another layer of the stator core 20. The U3-phase lead-out terminals U31 and U4-phase lead-out terminals U41 of the other two branches are located on the same layer as the U1-phase outlet terminals U12 and U2-phase outlet terminals U22, while the U3-phase outlet terminals U32 and U4-phase outlet terminals U42 are located on the same layer as the U1-phase lead-out terminals U11 and U2-phase lead-out terminals U21. In the stator winding 10, the windings of each branch are sequentially connected in parallel along the circumference of the stator core 20. When two branches of multiple hairpin coils in each phase are connected in parallel, the lead end 250 of the four branches connected in parallel is connected to the lead end at one end of the stator core 20, that is, the U1 phase lead end U12, the U2 phase lead end U22 are connected to the U3 phase lead end U31, and the U4 phase lead end U41. This connection method adopts a concentric structure connection or a full pitch structure connection to form a two-branch parallel connection.

[0073] A motor stator includes the motor stator winding 10 and the stator core 20 . The motor stator winding 10 is provided on the stator core 20 .

[0074] A motor comprises the above-mentioned motor stator.

[0075] The following is a detailed description with some embodiments.

[0076] In some embodiments described below, the stator winding 10 is mounted on a stator core 20. The stator core 20 has a plurality of slots 21 formed on the radially inner surface of the stator core 20 and spaced apart at a predetermined slot pitch along the circumferential direction of the stator core 20. The stator winding 10 is three-phase, and the hairpin coils in each phase of the stator winding 10 are connected in parallel in at least two branches along the circumference of the stator core 20. The number of slots per pole per phase is greater than or equal to 2. In some embodiments described below, the number of slots per pole per phase is 2. The rotor has 8 magnetic poles, and this applies to each phase of the stator winding 10. In this case, the number of slots 21 in the stator core 20 is 48.

[0077] The stator core 20 is defined by two adjacent slots 21 as a tooth portion. The stator core 20 is formed by stacking a plurality of annular magnetic steel plates to form two end faces in the axial direction of the stator core 20. Other conventional metal plates can also be used instead of magnetic steel plates. Figure 19-21As shown, multiple insulating papers 30 are inserted into these magnetic steel plate slots. The insulating paper 30 can be B-shaped insulating paper, or the insulating paper 30 can be double-mouthed paper, or the insulating paper 30 can be large S-shaped insulating paper. Any type of insulating paper 30 isolates the phase conductors in the slot, or the insulating paper 30 can be a single large-mouthed paper. When the conductor insulation is thicker, no isolation is required in the middle, and large-mouthed insulating paper can be used.

[0078] like Figure 19 As shown, when the insulating paper 30 is B-shaped insulating paper, the in-slot portions of the conductors in the slots of the stator core 20 are divided into two groups. The insulating paper 30 is wound, and the two ends of the insulating paper 30 are moved toward each other, meeting in the middle of the insulating paper 30 and moving toward the interior of the insulating paper 30, forming a B-shaped structure with two spaces. The in-slot portions of the conductors are located in the two spaces of the insulating paper 30. Alternatively, the in-slot portions of the conductors in the slots 21 of the stator core 20 are divided into multiple groups. Two adjacent groups are wound with B-shaped insulating paper. The in-slot portions of the conductors in the two adjacent groups are located in the two spaces of the B-shaped insulating paper. For example, in some embodiments described below, the slots 21 of the stator core 20 have in-slot portions for eight conductors. The eight in-slot portions of the conductors are divided into four groups. The first two groups are wound with one B-shaped insulating paper, and the last two groups are wound with one B-shaped insulating paper. This ensures that each space of the B-shaped insulating paper has in-slot portions for two conductors.

[0079] like Figure 20As shown, when the insulating paper 30 is S-shaped, the slot portions of the conductors of the stator core 20 are divided into two groups, and the middle portion of the insulating paper 30 is located between the slot portions of the two groups of conductors. One end of the insulating paper 30 extends toward the inner wall of the slot 21 of the stator core 20 and extends along the inner wall of the slot 21 of the stator core 20. The slot portion of one group of conductors is wound around the insulating paper 30 and extended to the adjacent slot portions of the two groups of conductors. The insulating paper 30 is located on the same straight line as the middle portion of the insulating paper and continues to extend to the notch of the slot 21 of the stator core 20. This portion overlaps with the extended portion of the other end of the insulating paper 30. At this point, the winding of the slot portion of one group of conductors is completed; the other end of the insulating paper 30 extends in the opposite direction, extending toward the notch of the slot 21 of the stator core 20, and extends along the inner wall of the stator core 20, winding around the slot portion of the other group of conductors, extending to the adjacent slot portions of the two groups of conductors, located on the same straight line as the middle position of the insulating paper, and continuing to extend to one side of the slot portion of the above-mentioned group of conductors. This portion of the insulating paper overlaps with the extended portion of one end of the above-mentioned insulating paper, so that the insulating paper is constructed into an S-shaped structure with two spaces, wrapping the two groups of conductors and separating the two groups of conductors. Alternatively, the conductor portions in the slots of the stator core 20 are divided into multiple groups, and two adjacent groups are wound with the above-mentioned S-shaped insulating paper. The slot portions of the two adjacent groups of conductors are located in two spaces of the S-shaped insulating paper. For example, in some of the following embodiments, the slots 21 of the stator core 20 have slot portions for eight conductors. The slot portions of the eight conductors are divided into four groups, the first two groups are wound with one S-shaped insulating paper, and the last two groups are wound with another S-shaped insulating paper, so that each space of the S-shaped insulating paper has slot portions for two conductors.

[0080] like Figure 21 As shown, when the insulating paper 30 is a mouth-shaped insulating paper, the insulating paper 30 is similar in shape to the slot 21 of the stator core 20 , and the insulating paper 30 wraps the conductor in the slot of the stator core 20 , and the two ends of the insulating paper 30 overlap at the notch of the slot 21 of the stator core 20 .

[0081] In some of the following embodiments, the stator core 20 has eight layers, the third conductor group 200 of the coil group 1 is located in the first, second, third, fourth, fifth, sixth, seventh, and eighth layers of the stator core 20, the deformed coil 1 is located in the second and third radial layers of the stator core 20, and the deformed coil 2 is located in the fourth and fifth radial layers of the stator core 20.

[0082] Example 1

[0083] A motor stator winding 10, such as Figure 8-11 As shown, it includes lead-out terminals 250. In this embodiment, the lead-out terminals 250 are respectively located on the first layer and the eighth layer.

[0084] It also includes coil group 1 and coil group 2, which are connected and arranged along the circumference of the stator core 20 to form the structure of the stator winding 10. In this embodiment, the position of one of the coil groups 2 corresponds to the lead wire end 250, and the coil group 2 and the lead wire end 250 are in the same radial direction of the stator core 20.

[0085] Coil group two includes deformed coil one, deformed coil two, and deformed coil three. Deformed coil one is a long-distance conductor 240, located in the radial second and third layers of the stator core 20; deformed coil two is a short-distance conductor 230, located in the radial fourth and fifth layers of the stator core 20; deformed coil three is a long-distance conductor 240, located in the radial sixth and seventh layers of the stator core 20. In the radial direction of the stator core 20 corresponding to coil group two, lead-out wire terminals 250 are respectively provided on the first and eighth layers.

[0086] The coil group 1 is composed of a plurality of third conductor groups 200 of the same structure, which are sequentially arranged along the radial first to eighth layers of the stator core 20. Specifically, the coil group 1 includes coil 1, coil 2, coil 3 and coil 4. Coil 1, coil 2, coil 3 and coil 4 are all arranged in two adjacent radial layers of the stator core 20. Coil 1 is arranged in the radial first and second layers of the stator core 20, coil 2 is arranged in the radial third and fourth layers of the stator core 20, coil 3 is arranged in the radial fifth and sixth layers of the stator core 20, and coil 4 is arranged in the stator In the radial seventh and eighth layers of the iron core 20, coil one, coil two, coil three and coil four are all concentric structures, and coil one, coil two, coil three and coil four are all third conductor groups 200 with the same structure. There are multiple of them, which are arranged in sequence along the circumference of the stator iron core 20. The third conductor group 200 includes a large conductor and a small conductor. The large conductor is arranged outside the small conductor, and the large conductor and the small conductor are both U-shaped conductors. The pitch of the large conductor is a long pitch, and the long pitch is preferably 7. The pitch of the small conductor is a short pitch, and the short pitch is preferably 5.

[0087] In this embodiment, each phase winding of the stator winding 10 can be connected in parallel with four branches. At the plug-in end, the U1 phase lead terminal U11 and the U2 phase lead terminal U21 of the lead terminal 250 of the four branches are located on the first layer, the U1 phase lead terminal U12 and the U2 phase lead terminal U22 are located on the eighth layer, the U3 phase lead terminal U31 and the U4 phase lead terminal U41 are located on the eighth layer, the U3 phase lead terminal U32 and the U4 phase lead terminal U42 are located on the first layer, the U1 phase lead terminal U11 and the U2 phase lead terminal U21, the U1 phase lead terminal U12 The U2 phase output terminal U22, the U3 phase lead terminal U31 and the U4 phase lead terminal U41, the U3 phase output terminal U32 and the U4 phase output terminal U42 are all located at the plug-in terminal of the stator winding 10, the two output terminals of the first branch are welded and connected to the coils of the adjacent layer, the two lead terminals of the second branch are welded and connected to the coils of the adjacent layer, the two output terminals of the third branch are welded and connected to the coils of the adjacent layer, and the two lead terminals of the fourth branch are welded and connected to the coils of the adjacent layer. When the four branches are connected in parallel, a star connection method or a triangle connection method is adopted.

[0088] In this embodiment, each phase winding of the stator winding 10 can also be connected in parallel with two branches. At the plug-in end, the U1 phase lead terminal U11 and the U2 phase lead terminal U21 of the lead terminal 250 of the two branches are located on the first layer, the U1 phase lead terminal U12 and the U2 phase lead terminal U22 are located on the eighth layer, the U3 phase lead terminal U31 and the U4 phase lead terminal U41 are located on the eighth layer, the U3 phase lead terminal U32 and the U4 phase lead terminal U42 are located on the first layer, and the U1 phase lead terminals U11 and U2 on the first layer are located on the eighth layer. Phase lead terminals U21 are connected to the U3 phase outlet terminals U32 and the U4 phase outlet terminals U42 located on the first layer, respectively. These two pairs of lead terminals are connected to the outlet terminals using a concentric structure, i.e., the pitches between the two pairs of lead terminals and the outlet terminals are respectively a long pitch and a short pitch, with the long pitch being preferably 7 and the short pitch being preferably 5. Alternatively, these two pairs of lead terminals are connected to the outlet terminals using a full pitch structure, i.e., the pitches between the two pairs of lead terminals and the outlet terminals are both a full pitch, with the full pitch being preferably 6. The two outlet terminals of the first branch are welded to the coils of the adjacent layer, the two lead terminals of the second branch are welded to the coils of the adjacent layer, the two outlet terminals of the third branch are welded to the coils of the adjacent layer, and the two lead terminals of the fourth branch are welded to the coils of the adjacent layer. When two branches are connected in parallel, a star connection or a delta connection is used.

[0089] Example 2

[0090] Compared with the first embodiment, the structure of the stator winding 10 of this embodiment is similar. The difference is that the structure of the coil group 2 is different and the type of the hairpin coil used is different. The other structures are the same. The structure of the coil group 2 is described below, and the other identical structures are not repeated.

[0091] In this embodiment, coil group two includes deformed coil one, deformed coil two, and deformed coil three, wherein deformed coil one is a long-distance conductor 240, located in the radial second and third layers of the stator core 20, deformed coil two is a short-distance conductor 230, located in the radial fourth and fifth layers of the stator core 20, and deformed coil three is a long full-distance conductor group 210, located in the radial sixth and seventh layers of the stator core 20.

[0092] Example 3

[0093] Compared with the first embodiment, this embodiment Figure 12-14 As shown, the structure of the stator winding 10 is similar, the difference is that the structure of the coil group 2 is different, and the type of hairpin coil used is different. The rest of the structures are the same. The structure of the coil group 2 is described below, and the rest of the same structures are not repeated.

[0094] In this embodiment, coil group two includes deformed coil one, deformed coil two, and deformed coil three. Deformed coil one is a short-distance conductor 230, located in the radial second and third layers of the stator core 20. Deformed coil two is a long-distance conductor 240, located in the radial fourth and fifth layers of the stator core 20. Deformed coil three is a short-distance conductor 230, located in the radial sixth and seventh layers of the stator core 20.

[0095] Example 4

[0096] Compared with the first embodiment, the structure of the stator winding 10 of this embodiment is similar. The difference is that the structure of the coil group 2 is different and the type of the hairpin coil used is different. The other structures are the same. The structure of the coil group 2 is described below, and the other identical structures are not repeated.

[0097] In this embodiment, coil group two includes deformed coil one, deformed coil two, and deformed coil three. Deformed coil one is a short-distance conductor 230, located in the radial second and third layers of the stator core 20. Deformed coil two is a long-distance conductor 240, located in the radial fourth and fifth layers of the stator core 20. Deformed coil three is a full short-distance conductor group 220, located in the radial sixth and seventh layers of the stator core 20.

[0098] Due to the adoption of the above technical solution, the stator winding structure adopts a completely symmetrical structure in the magnetic circuit, and has coil group one and coil group two. Coil group one adopts a conductor group with the same structure. In coil group two, adjacent coils adopt different types of hairpin coils, one coil is a long-distance conductor, and the other coil is a short-distance conductor. At least one coil group two and the lead wire end are in the same radial direction as the stator core, making the stator winding structure a completely symmetrical structure, eliminating the loop current problem caused by the asymmetric structure, reducing torque fluctuation, reducing harmonics, reducing noise, reducing bus bars, simplifying the manufacturing process, reducing production costs, and improving processing efficiency.

[0099] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A motor stator winding, characterized in that: include, Coil group 1 and coil group 2, wherein the coil group 1 and the coil group 2 are sequentially arranged along the circumference of the stator core, the coil group 1 is connected to the coil group 2, and at least one coil group 2 and a lead-out wire end are in the same radial direction of the stator core; The coil group 1 includes a plurality of hairpin coils, which are sequentially arranged along the circumference of the stator core. In each radial direction of the stator core occupied by the coil group 1, the plurality of hairpin coils are located on the first to Nth layers, where N is the number of radial layers of the stator core and is an even number greater than or equal to 6. The plurality of hairpin coils of the coil group 1 are concentrically arranged, and the hairpin coils constitute a third conductor group, which is arranged on two radially adjacent layers of the stator core. The second coil group includes at least a first deformed coil and a second deformed coil arranged adjacent to each other, the first deformed coil and the second deformed coil being arranged sequentially along the radial direction of the stator core, the first deformed coil and the second deformed coil being arranged on two radially adjacent layers of the stator core, and the first deformed coil and the second deformed coil being different types of hairpin coils, and being located in the same radial direction as the lead-out wire end in the second coil group, the first deformed coil and the second deformed coil being located on the second layer to the N-1th layer; The first deformed coil is a long-distance conductor, and the second deformed coil is a short-distance conductor; or the first deformed coil is a short-distance conductor, and the second deformed coil is a long-distance conductor.

2. The motor stator winding according to claim 1, characterized in that: The coil group 2 further includes at least a deformed coil 3, which is arranged adjacent to the deformed coil 2. The deformed coil 3 and the deformed coil 2 are different types of hairpin coils, and the deformed coil 3 is a long full-distance conductor group or the long-distance conductor.

3. The motor stator winding according to claim 1, characterized in that: The coil group 2 further includes at least a deformed coil 3, which is arranged adjacent to the deformed coil 2. The deformed coil 3 and the deformed coil 2 are different types of hairpin coils, and the deformed coil 3 is the entire short-distance conductor group or the short-distance conductor.

4. The motor stator winding according to any one of claims 1 to 3, characterized in that: The lead-out wire ends are arranged at the radial innermost layer and / or the outermost layer of the stator core.

5. The motor stator winding according to claim 2, characterized in that: The long full-pitch conductor group includes a first long-pitch conductor and a first full-pitch conductor. The first long-pitch conductor is arranged outside the first full-pitch conductor, and the long-pitch conductor is a second long-pitch conductor.

6. The motor stator winding according to claim 5, characterized in that: The pitch of the first long-pitch conductor is 8, the pitch of the first full-pitch conductor is 6, and the pitch of the second long-pitch conductor is 7.

7. The motor stator winding according to claim 3, characterized in that: The full-short pitch conductor group includes a second full-pitch conductor and a first short-pitch conductor. The second full-pitch conductor is arranged outside the first short-pitch conductor, and the short-pitch conductor is a second short-pitch conductor.

8. The motor stator winding according to claim 7, characterized in that: The pitch of the second full-pitch conductor is 6, the pitch of the first short-pitch conductor is 4, and the pitch of the second short-pitch conductor is 5.

9. The motor stator winding according to any one of claims 1-3 and 5-8, characterized in that: The number of the coil group 2 is an even number greater than or equal to 2.

10. The motor stator winding according to claim 1, characterized in that: The third conductor group includes a third long-pitch conductor and a third short-pitch conductor. The third long-pitch conductor is arranged outside the third short-pitch conductor. The pitch of the third long-pitch conductor is 7, and the pitch of the third short-pitch conductor is 5.

11. The motor stator winding according to claim 1, characterized in that: The four branches of the hairpin coils in each phase of the stator winding are connected in parallel; or, at least two branches of the hairpin coils in each phase of the stator winding are connected in parallel, and the lead ends of one group of two branches in the four branches are connected to the output ends of another group of two branches, and the connection method is a concentric structure connection or a full-pitch structure connection.

12. A motor stator, characterized in that: It comprises a motor stator winding and a stator core as described in any one of claims 1 to 11, wherein the motor stator winding is arranged on the stator core.

13. A motor, characterized in that: The motor comprises the stator according to claim 12.

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