A motor stator winding, stator and motor

Abstract

This invention provides a motor stator winding, including a first coil group and a second coil group, which are connected. At least one second coil group and its lead-out end are in the same radial direction as the stator core. The second coil group includes at least two sets of deformable coils, which are arranged radially along the stator core. Adjacent deformable coils have at least two sets of hairpin coils of different types. One set of hairpin coils is a first-type long-pitch hairpin coil or a second-type long-pitch hairpin coil, and the other set of hairpin coils is a first-type short-pitch hairpin coil or a second-type short-pitch hairpin coil. The advantages of this invention are that the stator winding structure adopts a completely symmetrical structure in the magnetic circuit, eliminating the circulating current problem caused by the asymmetrical structure, reducing torque fluctuations, reducing noise, using a single U-shaped conductor, simplifying the manufacturing process, reducing production costs, and improving processing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and in particular relates to a motor stator winding, stator, and motor. Background Technology

[0002] In existing technologies, stator windings include various types of conductor coils. These coils are arranged in a specific pattern and inserted into slots in the stator core to form the required windings for single-phase or multi-phase motors. Existing technologies use a wide variety of irregularly shaped hairpin coils with complex arrangements, requiring numerous busbars and busbars to connect the branches and neutral point of each phase winding. This results in complex manufacturing processes, 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] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a motor stator winding, comprising,

[0005] Coil group one and coil group two are connected. At least one coil group two and the lead wire end are in the same radial direction of the stator core. Coil group two includes at least two sets of deformed coils. Multiple deformed coils are arranged along the radial direction of the stator core, and adjacent deformed coils have at least two sets of different types of hairpin coils. One set of hairpin coils is a first type of long full-pitch hairpin coil or a second type of long-pitch hairpin coil, and the other set of hairpin coils is a first type of full short-pitch hairpin coil or a second type of short-pitch hairpin coil.

[0006] Furthermore, the lead-out end is located in the innermost and / or outermost radial layer of the stator core.

[0007] Furthermore, the first type of long-pitch hairpin coil includes a first conductor group, which includes a first long-pitch conductor and a first full-pitch conductor, with the first long-pitch conductor surrounding the first full-pitch conductor. The first type of short-pitch hairpin coil includes a second conductor group, which includes a second full-pitch conductor and a first short-pitch conductor, with the second full-pitch conductor surrounding the first short-pitch conductor.

[0008] Furthermore, the pitch of the first long-pitch conductor is 8, the pitch of the first full-pitch conductor is 6, the pitch of the second full-pitch conductor is 6, and the pitch of the first short-pitch conductor is 4.

[0009] Furthermore, the second type of long-pitch hairpin coil includes a first conductor, which is a second long-pitch conductor, and the second type of short-pitch hairpin coil includes a second conductor, which is a second short-pitch conductor.

[0010] Furthermore, the pitch of the second long-pitch conductor is 7, and the pitch of the second short-pitch conductor is 5.

[0011] Furthermore, the stator core has an even number of radial layers, which is greater than or equal to 6, and the number of coil groups 2 is an even number, which is greater than or equal to 2.

[0012] Furthermore, coil group one includes multiple hairpin coils, which are arranged sequentially along the circumference of the stator core and are concentrically arranged. The hairpin coils of coil group one are third conductors or third conductor groups, and multiple third conductors or third conductor groups are arranged sequentially along the radial direction of the stator core.

[0013] Furthermore, the third conductor group includes a third long-pitch conductor and a third short-pitch conductor, with the third long-pitch conductor surrounding 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.

[0014] Furthermore, the hairpin coils in each phase of the stator winding are connected in parallel with four branches; or, the hairpin coils in each phase of the stator winding are connected in parallel with at least two branches, and the lead ends of one set of two branches are connected to the output ends of another set of two branches, with the connection method being a concentric structure connection or a full-pitch structure connection.

[0015] An electric motor stator includes the aforementioned stator winding and stator core, wherein the stator winding is disposed on the stator core.

[0016] Furthermore, insulating paper is provided in the slots of the stator core. The insulating paper is of type B, type S, or type U.S.

[0017] An electric motor, comprising the aforementioned motor stator.

[0018] By adopting the above technical solution, the stator winding structure adopts a completely symmetrical structure on the magnetic circuit, with coil group one and coil group two. Coil group one is composed of multiple third conductor groups or third conductors with the same structure. In coil group two, multiple sets of deformed coils are arranged along the radial direction of the stator core, and adjacent deformed coils are different types of hairpin coils. One set of deformed coils is a first-type long full-pitch hairpin coil or a second-type long-pitch hairpin coil, and the other set of deformed coils is a first-type full short-pitch hairpin coil or a second-type short-pitch hairpin coil. At least one coil group two and the lead end are in the same radial direction of the stator core, so that the stator winding structure is a completely symmetrical structure on the magnetic circuit. This eliminates the loop current problem caused by the asymmetrical structure, reduces torque fluctuation, reduces harmonics, reduces noise, simplifies the layout, reduces the use of busbars and bus bars, simplifies the branch and neutral point connection of each phase winding, simplifies the manufacturing process, reduces production costs, and improves processing efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the stator structure according to Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of one phase of the stator winding in Embodiment 1 of the present invention;

[0021] Figure 3 These are schematic diagrams of the third conductor group structure according to some embodiments of the present invention;

[0022] Figure 4 These are schematic diagrams of the structure of long-pitch hairpin coils according to some embodiments of the present invention;

[0023] Figure 5 These are schematic diagrams of the structure of short-pitch hairpin coils according to some embodiments of the present invention;

[0024] Figure 6 These are schematic diagrams of the short-pitch hairpin coils according to some embodiments of the present invention;

[0025] Figure 7 These are schematic diagrams of the structure of long-pitch hairpin coils according to some embodiments of the present invention;

[0026] Figure 8 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 1 of the present invention;

[0027] Figure 9 This is a planar development view of the welding end when one phase and four branches are connected in parallel according to Embodiment 1 of the present invention;

[0028] Figure 10 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 1 of the present invention (connection of the lead-out end with a full pitch structure);

[0029] Figure 11 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 1 of the present invention (concentric structure connection of the lead-out ends);

[0030] Figure 12 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 2 of the present invention;

[0031] Figure 13 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 2 of the present invention (connection of the lead-out end with a full pitch structure);

[0032] Figure 14 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 2 of the present invention (the lead-out ends are connected in a concentric structure);

[0033] Figure 15This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 3 of the present invention;

[0034] Figure 16 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 3 of the present invention (connection of the lead-out end with a full pitch structure);

[0035] Figure 17 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 3 of the present invention (the lead-out ends are connected in a concentric structure);

[0036] Figure 18 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 4 of the present invention;

[0037] Figure 19 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 4 of the present invention (connection of the lead-out end with a full pitch structure);

[0038] Figure 20 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 4 of the present invention (the lead-out ends are connected in a concentric structure);

[0039] Figure 21 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 5 of the present invention;

[0040] Figure 22 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 5 of the present invention (connection of the lead-out end with a full pitch structure);

[0041] Figure 23 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 5 of the present invention (the lead-out ends are connected in a concentric structure);

[0042] Figure 24 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment Six of the present invention;

[0043] Figure 25 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 6 of the present invention (connection of the lead-out end with a full pitch structure);

[0044] Figure 26 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 6 of the present invention (the lead-out ends are connected in a concentric structure);

[0045] Figure 27 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 7 of the present invention;

[0046] Figure 28This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 7 of the present invention (connection of the lead-out end with a full pitch structure);

[0047] Figure 29 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 7 of the present invention (the lead-out ends are connected in a concentric structure);

[0048] Figure 30 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 8 of the present invention;

[0049] Figure 31 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 8 of the present invention (connection of the lead-out end with a full pitch structure);

[0050] Figure 32 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 8 of the present invention (the lead-out ends are connected in a concentric structure);

[0051] Figure 33 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 9 of the present invention;

[0052] Figure 34 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 9 of the present invention (connection of the lead-out end with a full pitch structure);

[0053] Figure 35 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 9 of the present invention (the lead-out ends are connected in a concentric structure);

[0054] Figure 36 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment 10 of the present invention;

[0055] Figure 37 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 10 of the present invention (connection of the lead-out end with a full pitch structure);

[0056] Figure 38 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 10 of the present invention (the lead-out ends are connected in a concentric structure);

[0057] Figure 39 This is a plan view of the plug-in terminal when a one-phase four-branch parallel connection is made according to Embodiment Eleven of the present invention;

[0058] Figure 40 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 11 of the present invention (connection of the lead-out end with a full pitch structure);

[0059] Figure 41This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment 11 of the present invention (concentric structure connection of the lead-out ends);

[0060] Figure 42 This is a plan view of the plug-in terminal when one phase and four branches are connected in parallel according to Embodiment Twelve of the present invention;

[0061] Figure 43 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment Twelve of the present invention (connection of the lead-out end with a full pitch structure);

[0062] Figure 44 This is a plan view of the plug-in end when the two branches of one phase are connected in parallel according to Embodiment Twelve of the present invention (concentric structure connection of the lead-out ends);

[0063] Figure 45 This is a schematic diagram of a star connection circuit with four branches in parallel according to some embodiments of the present invention;

[0064] Figure 46 This is a schematic diagram of a delta connection circuit with four branches in parallel according to some embodiments of the present invention;

[0065] Figure 47 This is a schematic diagram of a star connection circuit with two branches connected in parallel according to some embodiments of the present invention;

[0066] Figure 48 This is a schematic diagram of a delta connection circuit with two branches connected in parallel according to some embodiments of the present invention;

[0067] Figure 49 This is a schematic diagram of the structure of some embodiments of the present invention when the type B insulating paper is installed in the slot of the stator core;

[0068] Figure 50 This is a schematic diagram of the structure of S-type insulating paper installed in the slot of the stator core according to some embodiments of the present invention;

[0069] Figure 51 This is a schematic diagram of the structure of some embodiments of the present invention when the shaped insulating paper is installed in the slot of the stator core.

[0070] In the picture:

[0071] 10. Stator winding 20, stator core 200, third conductor group

[0072] 210, Long-pitch hairpin coil; 220, Short-pitch hairpin coil; 230, Short-pitch hairpin coil

[0073] 240, long-pitch hairpin coil; 250, lead wire terminal U11, U1 phase lead wire terminal

[0074] U12, U1 phase output terminal; U21, U2 phase lead terminal; U22, U2 phase output terminal

[0075] U31, U3 phase lead terminal; U32, U3 phase lead terminal; U41, U4 phase lead terminal

[0076] U42, U4 phase output terminal 200A, third long pitch conductor 200B, third short pitch conductor

[0077] 210A, first long-pitch conductor; 210B, first full-pitch conductor; 220A, second full-pitch conductor.

[0078] 220B, First short pitch conductor 21, Slot 30, Insulating paper Detailed Implementation

[0079] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0080] Figure 1-51 The diagram shows structural schematics of some embodiments of the present invention. Specifically, some embodiments of this invention are shown. Some embodiments involve a motor stator winding, a stator, and a motor. The stator winding adopts a completely symmetrical structure in the magnetic circuit, which eliminates the loop current problem caused by the asymmetrical structure, reduces torque fluctuation, and reduces noise. When the stator winding is manufactured, a single U-shaped conductor is used, which simplifies the manufacturing process, reduces production costs, and improves processing efficiency.

[0081] A stator winding 10 for an electric motor, such as Figure 1-7 As shown, the stator winding 10 includes a lead-out terminal 250, which is located in the innermost and / or outermost radial layer of the stator core 20. That is, the stator winding 10 has a lead-out terminal 250, i.e., it has a lead end and an outlet end. The lead-out terminal 250 is located in the innermost and / or outermost radial layer of the stator core 20, selected according to actual needs. The lead-out terminal 250 includes multiple S-shaped conductors, each S-shaped conductor comprising an inner slot and two outer slot ends. The slot is located inside the slot of the stator core 20. The two outer ends of the slot are located at the two axial ends of the stator core 20, and the two outer ends are respectively connected to the two ends inside the slot. One of the two outer ends is the lead end or the output end, and the other outer end is connected to the welding end of the adjacent conductor. The positions of the lead end and the output end can be interchanged. The two outer ends extend along the circumference of the stator core 20, and the two outer ends extend in opposite directions, so that the output end 250 is S-shaped.

[0082] The stator winding 10 also includes coil group one and coil group two. Coil group one is connected to coil group two. At least one coil group two and the lead end 250 are in the same radial direction of the stator core 20. Coil group two includes at least two sets of deformed coils. Multiple deformed coils are arranged along the radial direction of the stator core 20, and adjacent deformed coils have at least two sets of different types of hairpin coils. One set of hairpin coils is a first type of long full-pitch hairpin coil or a second type of long-pitch hairpin coil, and the other set of hairpin coils is a first type of full short-pitch hairpin coil or a second type of short-pitch hairpin coil. That is, the stator winding 10 includes coil group one and at least one coil group two. Both coil group one and coil group two include multiple hairpin coils. The multiple hairpin coils are arranged sequentially along the circumference of the stator core 20. The hairpin coils are all U-shaped conductors with two welding ends for welding connection with adjacent hairpin coils. They have two slots and one insertion end. One end of the two slots is connected to the two welding ends respectively, and the other end of the two slots is connected to the insertion end respectively, forming a U-shaped conductor structure. According to the needs of stator winding 10 preparation, U-shaped conductors with similar structures but different pitches are selected so that the stator winding 10 is completely symmetrical in magnetic circuit structure.

[0083] In this configuration, at least one coil group two is positioned in the same radial direction as the lead-out end 250 in the stator core 20. The coil group two has multiple deformable coils arranged sequentially along the radial direction of the stator core 20, either sequentially from the inside to the outside of the stator core 20 or sequentially from the outside to the inside of the stator core 20. Each adjacent deformable coil has at least two sets of different types of hairpin coils. One set of hairpin coils is a first-type long full-pitch hairpin coil 210 or a second-type long-pitch hairpin coil 240, and the other set of hairpin coils is a first-type full short-pitch hairpin coil 220 or a second-type short-pitch hairpin coil 230, selected according to actual needs. When there are multiple coil groups two, they are spaced apart on coil group one. Coil group one and multiple coil groups two are wound and connected to form the stator winding 10 structure. The number of coil groups two is an even number greater than or equal to 2. At least one coil group two and the lead end 250 are in the same radial direction of the stator core 20. The multiple coil groups two are connected to coil group one, and the multiple coil groups two are symmetrically arranged, so that the stator winding 10 has a completely symmetrical structure on the magnetic circuit.

[0084] Coil group one includes multiple hairpin coils, which are arranged sequentially along the circumference of the stator core 20. The multiple hairpin coils of coil group one are concentrically arranged. Furthermore, the hairpin coils of coil group one are third conductors or third conductor groups 200 of the same structure, arranged sequentially along the circumference of the stator core 20. Multiple third conductors or third conductor groups 200 of the same structure are arranged sequentially along the radial direction of the stator core 20, distributed in various radial layers of the stator core 20. Preferably, the third conductors or third conductor groups 200 are located in two adjacent radial layers of the stator core 20. That is, coil group one includes at least two coil groups, each coil group located in two adjacent radial layers of the stator core 20. All are constructed from a third conductor or a group of third conductors 200. The coil group 1 is distributed throughout each layer of the stator core 20. The third conductor or the group of third conductors 200 is composed of a hairpin coil. The hairpin coil is a U-shaped conductor. The third conductor is a U-shaped conductor with a span of long pitch, full pitch, or short pitch. The group of third conductors 200 includes a third long pitch conductor 200A and a third short pitch conductor 200B. The third long pitch conductor 200A surrounds the third short pitch conductor 200B. The third long pitch conductor 200A is a long pitch U-shaped conductor, and the third short pitch conductor 200B is a short pitch U-shaped conductor. Preferably, the pitch of the third long pitch conductor 200A is 7, and the pitch of the third short pitch conductor 200B is 5.

[0085] In coil group one, each coil is located in two adjacent layers of the stator core 20 in the radial direction. Each coil is arranged sequentially along the radial direction of the stator core 20. Each coil has the same structure and is composed of the same type of conductor or conductor group. Lead-out terminals 250 are provided in the outermost and / or innermost radial layers of the stator core 20. At least one coil group two is in the same radial direction of the stator core as the lead-out terminals. That is, depending on the setting position of the lead-out terminals 250, the coils of coil group two can be located in the same layer as the coils in coil group one, or the coils of coil group two can be located in two adjacent layers of two adjacent coils in coil group one, depending on actual needs. The type of conductor or conductor group of coil group two is different from the type of conductor or conductor group of coil group one.

[0086] like Figure 47 and 48 As shown, in the stator winding 10, at least two branches of multiple hairpin coils in each phase are connected in parallel. When the two branches are connected in parallel, the lead ends of one group of two branches are connected to the output ends of another group of two branches. The connection method is to use a concentric structure connection or a full pitch structure connection. The connection method of the two branches in parallel is a star connection or a delta connection. The lead end 250 has two lead ends and two output ends.

[0087] Or, such as Figure 45 and46 As shown, in the stator winding 10, multiple hairpin coils in each phase are connected in parallel in four branches. The four branches are connected in parallel in a star connection or a delta connection. The lead-out terminal 250 has four lead-out terminals and four output terminals.

[0088] Since the lead-out terminals 250 are composed of S-shaped conductors, when multiple hairpin coils in each phase are connected in parallel in four branches, 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, and the U1 phase output terminals U12 and U2 phase output 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 of the stator core 20 as the U1 phase output terminals U12 and U2 phase output terminals U22, and the U3 phase output terminals U32 and U4 phase output terminals U42 are located on the same layer of the stator core 20 as the U1 phase lead-out terminals U11 and U2 phase lead-out terminals U21. In the stator windings 10, each branch winding is connected in parallel sequentially along the circumference of the stator core 20. When multiple coil groups in each phase are connected in parallel with two branches, the lead-out terminals 250 of the four parallel branches are connected to the lead-out terminals on the same layer of the stator core 20. That is, the lead-out terminals U12 of phase U1 and U22 of phase U2 are connected to the lead-out terminals U31 of phase U3 and U41 of phase U4. This connection method adopts a concentric structure connection or a full pitch structure connection to form a parallel connection of two branches.

[0089] The stator core 20 has an even number of radial layers, which is greater than or equal to 6, and can be selected according to actual needs.

[0090] At least one coil group two in the same radial direction as the lead-out end 250 in the stator core 20 includes at least two groups of different types of hairpin coils. One group of hairpin coils is a first type of long full-pitch hairpin coil 210, which includes a first conductor group, which includes a first long pitch conductor 210A and a first full pitch conductor 210B, with the first long pitch conductor 210A surrounding the first full pitch conductor 210B. The other group of hairpin coils is a first type of full short pitch hairpin coil 220, which includes a second conductor group, which includes a second full pitch conductor 220A and a first short pitch conductor 220B, with the second full pitch conductor 220A surrounding the first short pitch conductor 220B.

[0091] Alternatively, one set of hairpin coils is a first type of long full-pitch hairpin coil 210, which includes a first conductor group, which includes a first long pitch conductor 210A and a first full pitch conductor 210B, with the first long pitch conductor 210A surrounding the first full pitch conductor 210B; the other set of hairpin coils is a second type of short-pitch hairpin coil 230, which includes a second conductor, which is a second short pitch conductor.

[0092] Alternatively, one set of hairpin coils is a second type of long-pitch hairpin coil 240, which includes a first conductor, the first conductor being a second long-pitch conductor; the other set of hairpin coils is a first type of whole-pitch hairpin coil 220, which includes a second conductor group, the second conductor group including a second whole-pitch conductor 220A and a first short-pitch conductor 220B, the second whole-pitch conductor 220A surrounding the first short-pitch conductor 220B.

[0093] Alternatively, one set of hairpin coils is a type 2 short-pitch hairpin coil 230, which is a second conductor and is a second short-pitch conductor; the other set of hairpin coils is a type 2 long-pitch hairpin coil 240, which is a first conductor and is a second long-pitch conductor.

[0094] Here, the first long-pitch conductor 210A, the first full-pitch conductor 210B, the first short-pitch conductor 220B, the second full-pitch conductor 220A, the second long-pitch conductor, and the second short-pitch conductor are U-shaped conductors with similar structures but different pitches. Each U-shaped conductor includes a first welding end, a second welding end, and a conductor body. The first welding end and the second welding end are respectively connected to the conductor body. The conductor body is U-shaped, forming a U-shaped conductor structure. The conductor body includes a first slot interior, a second slot interior, and a plug end. The first welding end is connected to the slot interior... One end of the first welded end is connected to the second welded end, and the other end of the first welded end and the other end of the second welded end are respectively connected to the plug-in end. The plug-in end is U-shaped, forming a U-shaped conductor. The first welded end and the second welded end are located at one axial end of the stator core, and the plug-in end is located at the other axial end of the stator core. The first welded end and the second welded end extend along the circumference of the stator core 20, and the extension directions are opposite, that is, the extension directions are opposite and far away from each other, or the extension directions are opposite, that is, the extension directions are opposite and close to each other. The first long pitch conductor 210A, the first full pitch conductor 210B, the first short pitch conductor 220B, the second full pitch conductor 220A, the second long pitch conductor, and the second short pitch conductor are all arranged in two radially adjacent layers of the stator core 20.

[0095] Further optimizing the scheme, coil group two also includes at least one type of hairpin coil adjacent to the two types of hairpin coils. The first hairpin coil is a conductor group or conductor, the conductor group including a long-pitch conductor and a full-pitch conductor, or the conductor group including a full-pitch conductor and a short-pitch conductor, the conductor being a long-pitch conductor or a short-pitch conductor. Specifically, when the stator core 20 has six layers, coil group two has two different types of deformed coils: one deformed coil is a first-type full-pitch short-pitch hairpin coil 220 or a second-type short-pitch hairpin coil 230, and the other deformed coil is a first-type long-pitch full-pitch hairpin coil 210 or a second-type long-pitch hairpin coil 240; when the stator core 20 has more than six layers, coil group two has three or more deformed coils, arranged sequentially from the inside to the outside along the radial direction of the stator core 20. In coil group two, adjacent deformed coils are different types of hairpin coils, such as the first deformed coil being a first-type long-pitch full-pitch hairpin coil 210 or... If the second type of long-pitch hairpin coil 240 is followed by an adjacent second deformed coil, which is either a first type of full-pitch hairpin coil 220 or a second type of short-pitch hairpin coil 230, and the next deformed coil is either a first type of long-pitch hairpin coil 210 or a second type of long-pitch hairpin coil 240, and so on; or if the first deformed coil is either a first type of full-pitch hairpin coil 220 or a second type of short-pitch hairpin coil 230, then the adjacent second deformed coil is either a first type of long-pitch hairpin coil 210 or a second type of long-pitch hairpin coil 240, and the next deformed coil is either a first type of full-pitch hairpin coil 220 or a second type of short-pitch hairpin coil 230.

[0096] An electric motor stator includes the aforementioned stator winding 10 and stator core 20, wherein the stator winding 10 is disposed on the stator core 20.

[0097] An electric motor, comprising the aforementioned motor stator.

[0098] The following describes some specific embodiments. In these embodiments, the second coil group of the stator winding 10 includes four types of hairpin coils, specifically including a first type of long full-pitch hairpin coil 210, a second type of long-pitch hairpin coil 240, a first type of full-short-pitch hairpin coil 220, and a second type of short-pitch hairpin coil 230. The first type of long full-pitch hairpin coil 210 includes at least one first conductor group, which includes a first long-pitch conductor 210A and a first full-pitch conductor 210B. The first long-pitch conductor 210A surrounds the first full-pitch conductor 210B, and the first long-pitch conductor 210A and the first full-pitch conductor 210B are connected. All 0B are U-shaped conductors; the second type of long-pitch hairpin coil 240 includes at least one first conductor, which is a long-pitch conductor and is a U-shaped conductor; the first type of whole-pitch hairpin coil 220 includes at least one second conductor group, which includes a second whole-pitch conductor 220A and a first short-pitch conductor 220B, the second whole-pitch conductor 220A surrounding the first short-pitch conductor 220B, and both the second whole-pitch conductor 220A and the first short-pitch conductor 220B are U-shaped conductors; the second type of short-pitch hairpin coil 230 includes at least one second conductor, which is a short-pitch conductor and is a U-shaped conductor.

[0099] Meanwhile, coil group one includes multiple conductor groups, each including a large conductor and a small conductor. The large conductor surrounds the small conductor. The large conductor is a long-pitch U-shaped conductor, and the small conductor is a short-pitch U-shaped conductor.

[0100] In some of the embodiments described below, the stator winding 10 is mounted on a stator core 20, which has a plurality of slots 21 formed on the radial inner surface of the stator core 20 and spaced apart by a predetermined slot pitch along the circumferential direction of the stator core 20. The stator winding 10 is three-phase, and the hairpin coil in each phase stator winding 10 is connected in parallel with at least two branches along the circumferential direction of the stator core 20. There are at least two slots per pole per phase. In some of the embodiments described below, the number of slots per pole per phase is two, and the rotor has eight magnetic poles, and this is true for each phase of the stator winding 10, then the number of slots in the stator core 20 is 48.

[0101] The stator core 20 is defined by two adjacent slots 21, each defining a tooth. The stator core 20 is formed by stacked annular magnetic steel plates, creating two end faces in the axial direction. Other conventional metal plates can also be used instead of magnetic steel plates. For example... Figures 49-51As shown, multiple insulating papers 30 are inserted into these magnetic steel plate slots. The insulating paper 30 can be B-shaped insulating paper, or it can be double-mouthed paper, or it can be large S-shaped insulating paper. Any of the insulating papers 30 isolates the phase conductors in the slot. Alternatively, the insulating paper 30 can be a single large-mouthed paper. When the conductor insulation is thicker, no intermediate isolation is required, and a large-mouthed insulating paper can be used.

[0102] like Figure 49 As shown, when the insulating paper 30 is a B-type insulating paper, the slot portion of the conductor in the stator core 20 slot is divided into two groups, the insulating paper 30 is wound, the two ends of the insulating paper 30 move towards each other, meet in the middle of the insulating paper 30, and move into the interior of the insulating paper 30, forming a B-type structure with two spaces, and the slot portion of the conductor is located in the two spaces of the insulating paper. Alternatively, the slot portion of the conductor in the stator core 20 slot 21 is divided into multiple groups, and adjacent groups are wound with B-type insulating paper, and the slot portion of the conductor in adjacent groups is located in the two spaces of the B-type insulating paper. In some embodiments, the stator core 20 slot 21 has slot portions of 8 conductors, the slot portions of the 8 conductors are divided into four groups, the first two groups are wound with one B-type insulating paper, and the last two groups are wound with one B-type insulating paper, so that each space of the B-type insulating paper has slot portions of two conductors.

[0103] like Figure 50As shown, when the insulating paper 30 is S-shaped, it divides the slot portion of the stator core 20 conductor into two groups. 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 towards the inner wall of the slot 21 of the stator core 20 and along the inner wall of the slot 21 of the stator core 20, wrapping around the slot portion of one group of conductors. It extends to the adjacent slot portion of the two groups of conductors, and is aligned with the middle position of the insulating paper. It continues to extend to the slot opening of the slot 21 of the stator core 20. This part coincides with the other end of the extended portion of the insulating paper 30. At this point, the winding of the slot portion of one set of conductors is completed; the other end of the insulating paper 30 extends in the opposite direction, towards the slot opening of the slot 21 of the stator core 20, and along the inner wall of the stator core 20, winding the slot portion of another set of conductors, extending to the adjacent slot portion of the two sets of conductors, 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 aforementioned set of conductors. This part of the insulating paper overlaps with the extension portion of one end of the aforementioned insulating paper, so that the insulating paper is constructed into an S-shaped structure with two spaces, wrapping the two sets of conductors and separating the two sets of conductors. Alternatively, the conductor portion within the slot of the stator core 20 can be divided into multiple groups, with adjacent groups wrapped with the aforementioned S-shaped insulating paper. The slot portions of the conductors in the adjacent groups are located within two spaces of the S-shaped insulating paper. In some embodiments described below, the slot 21 of the stator core 20 has slot portions of 8 conductors. The slot portions of the 8 conductors are divided into four groups, with the first two groups wrapped with one S-shaped insulating paper and the last two groups wrapped with one S-shaped insulating paper, so that each space of the S-shaped insulating paper has slot portions of two conductors.

[0104] like Figure 51 As shown, when the insulating paper 30 is a U-shaped insulating paper, the insulating paper 30 is similar in shape to the slot 21 of the stator core 20. 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 slot opening of the slot 21 of the stator core 20.

[0105] In some of the following embodiments, the stator core 20 has 8 layers. The coil group 1 includes multiple third conductor groups 200. Each third conductor group 200 includes a third long-pitch conductor 200A and a third short-pitch conductor 200B. The third long-pitch conductor 200A surrounds the third short-pitch conductor 200B. Both the third long-pitch conductor 200A and the third short-pitch conductor 200B are U-shaped conductors. The pitch of the third long-pitch conductor 200A is a long pitch, preferably 7. The pitch of the third short-pitch conductor 200B is a short pitch, preferably 5. The slots of the third long-pitch conductor 200A and the third short-pitch conductor 200B are located in two radially adjacent layers of the stator core 20. The third conductor group 200 is located in the first, second, third, fourth, fifth, sixth, seventh, and eighth layers of the stator core 20.

[0106] At least one coil group two is located in the same radial direction as the input / output terminal 250 of the stator core 20. The coil group two includes four types of deformed coils: a first type long-pitch hairpin coil 210, a second type long-pitch hairpin coil 240, a first type short-pitch hairpin coil 220, and a second type short-pitch hairpin coil 230. The first type long-pitch hairpin coil 210 includes at least one first conductor group, which includes a first long-pitch conductor 210A and a first full-pitch conductor 210B. The first long-pitch conductor 210A surrounds the first full-pitch conductor 210B, and both the first long-pitch conductor 210A and the first full-pitch conductor 210B are U-shaped conductors. Preferably, the pitch of the long-pitch conductor is 8, and the pitch of the full-pitch conductor is... 6; The second type of long-pitch hairpin coil 240 is a long-pitch conductor, which is a U-shaped conductor. Preferably, the pitch of the long-pitch conductor is 7. The first type of whole-pitch hairpin coil 220 includes at least one second conductor group, which includes a second whole-pitch conductor 220A and a first short-pitch conductor 220B. The second whole-pitch conductor 220A surrounds the first short-pitch conductor 220B, and both the second whole-pitch conductor 220A and the first short-pitch conductor 220B are U-shaped conductors. Preferably, the pitch of the second whole-pitch conductor 220A is 6, and the pitch of the first short-pitch conductor 220B is 4. The second type of short-pitch hairpin coil 230 is a short-pitch conductor, which is a U-shaped conductor. Preferably, the short-pitch conductor is 5.

[0107] Example 1

[0108] A stator winding 10 for an electric motor, such as Figure 8-11 As shown, it includes lead-out terminals 250. In this embodiment, the lead-out terminals 250 are located in the first layer and the eighth layer, respectively.

[0109] It also includes coil group one and coil group two, which are connected and arranged along the circumference of the stator core 20 to form a stator winding structure. In this embodiment, the position of one of the coil groups two corresponds to the lead end 250, and the coil group two and the lead end 250 are in the same radial direction of the stator core 20.

[0110] Coil group two includes a first type of long full-pitch hairpin coil 210, a first type of short full-pitch hairpin coil 220, and a first type of long full-pitch hairpin coil 210. The first type of long full-pitch hairpin coil 210 is located in the second and third radial layers of the stator core 20, the first type of short full-pitch hairpin coil 220 is located in the fourth and fifth radial layers of the stator core 20, and the first type of long full-pitch hairpin coil 210 is located in the sixth and seventh radial layers of the stator core 20.

[0111] Coil group one consists of multiple third conductor groups 200 with the same structure, arranged sequentially from the first to the eighth layer radially along the stator core. Specifically, coil group one includes coil one, coil two, coil three, and coil four. Coil one, coil two, coil three, and coil four are all located in two adjacent radial layers of the stator core 20. Coil one is located in the first and second radial layers of the stator core 20, coil two is located in the third and fourth radial layers of the stator core 20, coil three is located in the fifth and sixth radial layers of the stator core 20, and coil four is located in the fourth radial layer of the stator core 20. The seventh and eighth radial layers of 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 such groups, which are arranged sequentially along the circumference of stator core 20. The third conductor group 200 includes a large conductor and a small conductor. The large conductor surrounds the small conductor, and both the large conductor and the small conductor are U-shaped conductors. The pitch of the large conductor is a long pitch, preferably 7, and the pitch of the small conductor is a short pitch, preferably 5.

[0112] In this embodiment, each phase winding of the stator winding 10 can be four branches connected in parallel. At the insertion terminals, the U1 phase lead terminal U11 and the U2 phase lead terminal U21 of the four branches are located in the first layer, the U1 phase output terminal U12 and the U2 phase output terminal U22 are located in the eighth layer, the U3 phase lead terminal U31 and the U4 phase lead terminal U41 are located in the eighth layer, and the U3 phase output terminal U32 and the U4 phase output terminal U42 are located in the first layer. The U1 phase lead terminal U11 and the U2 phase lead terminal U21, the U1 phase output terminal U12 and the U2 phase output terminal U22, and the U3 phase lead terminal U42 are located in the first layer. Phase lead terminals U31 and U41, and phase output terminals U32 and U42 are all located at the insertion terminals of stator winding 20. The two output terminals of the first branch are welded to the conductors of the adjacent coil group; the two lead terminals of the second branch are welded to the conductors of the adjacent coil group; the two output terminals of the third branch are welded to the conductors of the adjacent coil group; and the two lead terminals of the fourth branch are welded to the conductors of the adjacent coil group. When the four branches are connected in parallel, a star connection or a delta connection is used. Figures 47-48 As shown.

[0113] In this embodiment, each phase winding of the stator winding 10 can also be two branches connected in parallel. At the insertion terminals, the U1 phase lead terminals U11 and U2 phase lead terminals U21 of the two branches are located in the first layer, the U1 phase output terminals U12 and U2 phase output terminals U22 are located in the eighth layer, the U3 phase lead terminals U31 and U4 phase lead terminals U41 are located in the eighth layer, and the U3 phase output terminals U32 and U4 phase output terminals U42 are located in the first layer. The U1 phase lead terminals U11 and U2 phase lead terminals located in the first layer are... U21 is connected to the U3 phase output terminal U32 and the U4 phase output terminal U42 located in the first layer, respectively. The two pairs of leads are connected to the output terminals in a concentric structure, meaning the pitches between the two pairs of leads and output terminals are a long pitch and a short pitch, respectively. The long pitch is preferably 7, and the short pitch is preferably 5. Alternatively, the two pairs of leads are connected to the output terminals in a full-pitch structure, meaning the pitches between the two pairs of leads and output terminals are both full pitches, preferably 6. The two output terminals of the first branch are soldered to the conductors of the coil group in the adjacent layer. The two leads of the second branch are soldered to the conductors of the coil group in the adjacent layer. The two output terminals of the third branch are soldered to the conductors of the coil group in the adjacent layer. The two leads of the fourth branch are soldered to the conductors of the coil group in the adjacent layer. When two branches are connected in parallel, a star connection or a delta connection is used, such as... Figures 45-46 As shown.

[0114] Example 2

[0115] Compared with Example 1, this embodiment is as follows: Figure 12-14As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0116] In this embodiment, the second coil group includes a first type of long-pitch hairpin coil 210, a second type of short-pitch hairpin coil 230, and a first type of long-pitch hairpin coil 210. The first type of long-pitch hairpin coil 210 is located in the second and third radial layers of the stator core 20, the second type of short-pitch hairpin coil 230 is located in the fourth and fifth radial layers of the stator core 20, and the first type of long-pitch hairpin coil 210 is located in the sixth and seventh radial layers of the stator core 20.

[0117] Example 3

[0118] Compared with Example 1, this embodiment is as follows: Figure 15-17 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0119] In this embodiment, the second coil group includes a first type of long-pitch hairpin coil 210, a first type of short-pitch hairpin coil 220, and a second type of long-pitch hairpin coil 240. The first type of long-pitch hairpin coil 210 is located in the second and third radial layers of the stator core 20, the first type of short-pitch hairpin coil 220 is located in the fourth and fifth radial layers of the stator core 20, and the second type of long-pitch hairpin coil 240 is located in the sixth and seventh radial layers of the stator core 20.

[0120] Example 4

[0121] Compared with Example 1, this embodiment is as follows: Figure 18-20 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0122] In this embodiment, the second coil group includes a second type of long-pitch hairpin coil 240, a first type of long-pitch hairpin coil 220, and a second type of long-pitch hairpin coil 240. The second type of long-pitch hairpin coil 240 is located in the second and third radial layers of the stator core 20, the first type of long-pitch hairpin coil 220 is located in the fourth and fifth radial layers of the stator core 20, and the second type of long-pitch hairpin coil 240 is located in the sixth and seventh radial layers of the stator core 20.

[0123] Example 5

[0124] Compared with Example 1, this embodiment is as follows: Figure 21-23 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0125] In this embodiment, the second coil group includes a second type of long-pitch hairpin coil 240, a second type of short-pitch hairpin coil 230, and a second type of long-pitch hairpin coil 240. The second type of long-pitch hairpin coil 240 is located in the second and third radial layers of the stator core 20, the second type of short-pitch hairpin coil 230 is located in the fourth and fifth radial layers of the stator core 20, and the second type of long-pitch hairpin coil 240 is located in the sixth and seventh radial layers of the stator core 20.

[0126] Example 6

[0127] Compared with Example 1, this embodiment is as follows: Figure 24-26 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0128] In this embodiment, the second coil group includes a first type of long-pitch hairpin coil 210, a second type of short-pitch hairpin coil 230, and a second type of long-pitch hairpin coil 240. The first type of long-pitch hairpin coil 210 is located in the second and third radial layers of the stator core 20, the second type of short-pitch hairpin coil 230 is located in the fourth and fifth radial layers of the stator core 20, and the second type of long-pitch hairpin coil 240 is located in the sixth and seventh radial layers of the stator core 20.

[0129] Example 7

[0130] Compared with Example 1, this embodiment is as follows: Figures 27-29 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0131] In this embodiment, the second coil group includes a first type of short-pitch hairpin coil 220, a first type of long-pitch hairpin coil 210, and a first type of short-pitch hairpin coil 220. The first type of short-pitch hairpin coil 220 is located in the second and third radial layers of the stator core 20, the first type of long-pitch hairpin coil 210 is located in the fourth and fifth radial layers of the stator core 20, and the first type of short-pitch hairpin coil 220 is located in the sixth and seventh radial layers of the stator core 20.

[0132] Example 8

[0133] Compared with Example 1, this embodiment is as follows: Figure 30-32 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0134] In this embodiment, the second coil group includes a first type of short-pitch hairpin coil 220, a second type of long-pitch hairpin coil 240, and the first type of short-pitch hairpin coil 220. The first type of short-pitch hairpin coil 220 is located in the second and third radial layers of the stator core 20, the second type of long-pitch hairpin coil 240 is located in the fourth and fifth radial layers of the stator core 20, and the first type of short-pitch hairpin coil 220 is located in the sixth and seventh radial layers of the stator core 20.

[0135] Embodiment 9

[0136] Compared with Example 1, this embodiment is as follows: Figure 33-35 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0137] In this embodiment, the second coil group includes a first type of full-pitch hairpin coil 220, a first type of long-pitch hairpin coil 210, and a second type of short-pitch hairpin coil 230. The first type of full-pitch hairpin coil 220 is located in the second and third radial layers of the stator core 20, the first type of long-pitch hairpin coil 210 is located in the fourth and fifth radial layers of the stator core 20, and the second type of short-pitch hairpin coil 230 is located in the sixth and seventh radial layers of the stator core 20.

[0138] Example 10

[0139] Compared with Example 1, this embodiment is as follows: Figures 36-38 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0140] In this embodiment, the second coil group includes a second type of short-pitch hairpin coil 230, a first type of long-pitch hairpin coil 210, and a second type of short-pitch hairpin coil 230. The second type of short-pitch hairpin coil 230 is located in the second and third radial layers of the stator core 20, the first type of long-pitch hairpin coil 210 is located in the fourth and fifth radial layers of the stator core 20, and the second type of short-pitch hairpin coil 230 is located in the sixth and seventh radial layers of the stator core 20.

[0141] Example 11

[0142] Compared with Example 1, this embodiment is as follows: Figures 39-41 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0143] In this embodiment, the second coil group includes a second type of short-pitch hairpin coil 230, a second type of long-pitch hairpin coil 240, and a second type of short-pitch hairpin coil 230. The second type of short-pitch hairpin coil 230 is located in the second and third radial layers of the stator core 20, the second type of long-pitch hairpin coil 240 is located in the fourth and fifth radial layers of the stator core 20, and the second type of short-pitch hairpin coil 230 is located in the sixth and seventh radial layers of the stator core 20.

[0144] Example 12

[0145] Compared with Example 1, this embodiment is as follows: Figures 42-44 As shown, the structure of stator winding 10 is similar, except that the structure of coil group two is different and the type of hairpin coil used is different. The rest of the structure is the same. The structure of coil group two will be described below, and the other identical structures will not be described again.

[0146] In this embodiment, the second coil group includes a first type of short-pitch hairpin coil 220, a second type of long-pitch hairpin coil 240, and a second type of short-pitch hairpin coil 230. The first type of short-pitch hairpin coil 220 is located in the second and third radial layers of the stator core 20, the second type of long-pitch hairpin coil 240 is located in the fourth and fifth radial layers of the stator core 20, and the second type of short-pitch hairpin coil 230 is located in the sixth and seventh radial layers of the stator core 20.

[0147] By adopting the above technical solution, the stator winding structure adopts a completely symmetrical structure in the magnetic circuit, with coil group one and coil group two. Coil group one is composed of multiple third conductor groups or third conductors with the same structure. In coil group two, multiple sets of deformed coils are arranged along the radial direction of the stator core, and adjacent deformed coils are different types of hairpin coils. One set of deformed coils is a first type of long full-pitch hairpin coil or a second type of long-pitch hairpin coil, and the other set of deformed coils is a first type of full short-pitch hairpin coil or a second type of short-pitch hairpin coil. At least one coil group two and the lead end are in the same radial direction of the stator core, so that the stator winding structure is a completely symmetrical structure. This eliminates the loop current problem caused by the asymmetrical structure, reduces torque fluctuation, reduces noise, uses a single U-shaped conductor, simplifies the manufacturing process, reduces production costs, and improves processing efficiency.

[0148] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A stator winding for an electric motor, characterized in that: include, Coil group one and coil group two are connected to each other and are arranged along the circumferential direction of the stator core. At least one coil group two and the lead wire end are in the same radial direction of the stator core. Coil group two includes at least two sets of deformable coils. Multiple deformable coils are arranged along the radial direction of the stator core. The two sets of slots of the deformable coils are respectively arranged in two adjacent radial layers along the radial direction of the stator core. Adjacent deformable coils have at least two sets of different types of hairpin coils. One set of hairpin coils is a first type of long full-pitch hairpin coil or a second type of long-pitch hairpin coil, and the other set of hairpin coils is a first type of full short-pitch hairpin coil or a second type of short-pitch hairpin coil. Coil group one includes multiple hairpin coils. The multiple hairpin coils are arranged sequentially along the circumferential direction of the stator core. The two sets of slots of the hairpin coils are respectively arranged in two adjacent radial layers along the radial direction of the stator core. The stator core has an even number of radial layers, which is greater than or equal to 6. The number of coil groups two is an even number greater than or equal to 2; The plurality of hairpin coils are arranged concentrically, and the hairpin coil of the first coil group is a third conductor or a third conductor group. The plurality of third conductors or third conductor groups are arranged sequentially along the radial direction 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 surrounds 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.

2. The motor stator winding according to claim 1, characterized in that: The lead-out end is located in the innermost and / or outermost radial layer of the stator core.

3. The motor stator winding according to claim 1 or 2, characterized in that: The first type of long-pitch hairpin coil includes a first conductor group, which includes a first long-pitch conductor and a first full-pitch conductor, with the first long-pitch conductor surrounding the first full-pitch conductor. The first type of short-pitch hairpin coil includes a second conductor group, which includes a second full-pitch conductor and a first short-pitch conductor, with the second full-pitch conductor surrounding the first short-pitch conductor.

4. The motor stator winding according to claim 3, characterized in that: The first long-pitch conductor has a pitch of 8, the first full-pitch conductor has a pitch of 6, the second full-pitch conductor has a pitch of 6, and the first short-pitch conductor has a pitch of 4.

5. The motor stator winding according to claim 1, 2, or 4, characterized in that: The second type of long-pitch hairpin coil includes a first conductor, which is a second long-pitch conductor; the second type of short-pitch hairpin coil includes a second conductor, which is a second short-pitch conductor.

6. The motor stator winding according to claim 5, characterized in that: The second long-pitch conductor has a pitch of 7, and the second short-pitch conductor has a pitch of 5.

7. The motor stator winding according to claim 1, characterized in that: The four branches of the hairpin coil in each phase of the stator winding are connected in parallel; or, at least two branches of the hairpin coil in each phase of the stator winding are connected in parallel, and the lead ends of one group of two 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.

8. A motor stator, characterized in that: It includes the motor stator winding and stator core as described in any one of claims 1-7, wherein the motor stator winding is disposed on the stator core.

9. The motor stator according to claim 8, characterized in that: The slots of the stator core are provided with insulating paper, which is type B, type S, or type U-shaped insulating paper.

10. An electric motor, characterized in that: Includes the motor stator as described in claim 8 or 9.

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