Motor stator and motor

Abstract

This invention relates to the field of electric motors, and discloses an electric motor stator and an electric motor. The stator winding has two slots per pole per phase, and three branch windings in each phase winding are connected in parallel along the circumference of the stator core. One branch winding of each phase winding includes: one first conductor group, multiple second conductor groups, multiple third conductor groups, and one fourth conductor group; or one branch winding of each phase winding includes: multiple second conductor groups, multiple third conductor groups, and one fourth conductor group. By adopting a completely symmetrical structure in the magnetic circuit through the winding structure, the loop current problem caused by the asymmetrical structure is eliminated, torque fluctuation is reduced, noise is reduced, manufacturing process is simplified, production cost is reduced, and processing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more particularly to an electric motor stator and an electric motor. Background Technology

[0002] In existing technologies, stator windings include various types of conductors, including U-shaped and S-shaped conductors. These conductors are arranged in a specific pattern and inserted into the slots of the stator core to form the required multiphase motor windings. Currently, each phase winding of the stator winding consists of multiple branches connected in parallel or in series. For a phase winding with three branches connected in parallel, the stator winding requires at least 3 slots per pole per phase; for a phase winding with two or four branches connected in series, the stator winding requires at least 2 slots per pole per phase.

[0003] Moreover, the stator windings used in the current technology have complex manufacturing processes, high production costs, and low processing efficiency; in addition, the magnetic circuit of the current stator windings has loop current problems, which increases torque fluctuations and generates more noise. Summary of the Invention

[0004] This invention provides a motor stator and a motor, which adopts a completely symmetrical structure in the magnetic circuit through the winding structure, thereby eliminating the loop current problem caused by the asymmetrical structure, reducing torque fluctuation, reducing noise, simplifying the manufacturing process, reducing production costs, and improving processing efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electric motor stator includes: a stator core having a plurality of slots formed on the radial inner surface of the stator core and spaced apart at a predetermined slot pitch along the circumferential direction of the stator core;

[0007] The stator winding has 2 slots per pole per phase. The stator winding includes multiple phase windings mounted on the stator core so that they are different from each other in electrical phase.

[0008] Each phase winding consists of three branch windings connected in parallel along the circumference of the stator core.

[0009] At least one branch winding of the three-branch winding of each phase winding includes: 1 first conductor group, multiple second conductor groups, multiple third conductor groups, and 1 fourth conductor group; or at least one branch winding of the three-branch winding of each phase winding includes: multiple second conductor groups, multiple third conductor groups, and 1 fourth conductor group; or at least one branch winding of the three-branch winding of each phase winding includes: 1 first conductor group, multiple second conductor groups, and multiple third conductor groups.

[0010] Each slot is divided into M radially distributed layers based on the number of slots that can be accommodated in the radial direction of the stator core, where M is an even number greater than or equal to 6.

[0011] The first conductor group of each branch winding is located in the Mth layer of the stator core in the radial direction, and the fourth conductor group of the branch winding is located in the first layer of the stator core in the radial direction.

[0012] Each conductor group includes multiple conductors, and the conductors of each conductor group include: two welded ends located inside two slots of the stator core with a specified slot spacing, two slots connected to the conductor located inside the two slots of the stator core with a second axial end, and two plug-in ends located inside the two slots of the stator core with a first axial end;

[0013] The welded end of the lead wire connection of each branch winding of each phase winding is located at the first axial end of the stator core.

[0014] Furthermore, the welded ends of at least one branch winding lead-out connections of each phase winding are located in two adjacent radial layers of the stator core. The welded ends of the lead-out connections of the at least one branch winding are located in the Nth and N+1th radial layers of the stator core, or the welded ends of the lead-out connections of the at least one branch winding are located in the N+1th and N+2th radial layers of the stator core, where N is an odd number.

[0015] Furthermore, the welded end of the lead wire connection of at least one branch winding of each phase winding is located in the Mth layer or the first layer of the same radial layer of the stator core.

[0016] Furthermore, one branch winding of each phase winding may also include a conductor of a first conductor group, or one branch winding of each phase winding may also include a conductor of a second conductor group, or one branch winding of each phase winding may also include a conductor of a third conductor group, or one branch winding of each phase winding may also include a conductor of a fourth conductor group.

[0017] Furthermore, the slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding and the two slots of one conductor of a second conductor group are located in two adjacent slots in the circumferential direction of the stator core; and / or, the slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding and the two slots of one conductor of a third conductor group are located in two adjacent slots in the circumferential direction of the stator core.

[0018] Furthermore, the slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding and the two slots of a conductor of a first conductor group are located in two adjacent slots in the circumferential direction of the stator core; and / or, the slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding and the two slots of a conductor of a fourth conductor group are located in two adjacent slots in the circumferential direction of the stator core.

[0019] Furthermore, the first conductor group includes two first conductors, and the pitch between the two slots of each first conductor is a whole pitch; the fourth conductor group includes a fourth large conductor and a fourth small conductor, and the pitch between the two slots of the fourth large conductor is a long pitch, and the pitch between the two slots of the fourth small conductor is a short pitch.

[0020] Furthermore, the second conductor group includes: a fifth large conductor and a fifth small conductor, or the second conductor group includes: two identical second conductors; the two slots of each conductor in the second conductor group are located in the radially adjacent Nth and N+1th layers of the stator core, respectively, where N is an odd number;

[0021] The third conductor group includes two conductors, and the two slots of each conductor in the third conductor group are located in the N+1th and N+2th layers of the stator core respectively.

[0022] Furthermore, the pitch between the two slots of the fifth large conductor in the second conductor group is a long pitch, and the pitch between the two slots of the fifth small conductor in the second conductor group is a short pitch; the two conductors in the third conductor group are the same third conductor, and the pitch between the two slots of the third conductor is a whole pitch, and / or, the two conductors in the third conductor group are the sixth large conductor and the sixth small conductor, and the pitch between the two slots of the sixth large conductor is a long pitch, and the pitch between the two slots of the sixth small conductor is a short pitch.

[0023] Furthermore, the pitch between the two slots of the second conductor in the second conductor group is a whole pitch; the two conductors in the third conductor group are the same third conductor, and the pitch between the two slots of the third conductor is a whole pitch; and / or, the two conductors in the third conductor group are a sixth large conductor and a sixth small conductor, and the pitch between the two slots of the sixth large conductor is a long pitch, and the pitch between the two slots of the sixth small conductor is a short pitch.

[0024] Furthermore, the phase winding has multiple first connection welding ends and multiple second connection welding ends connected together. The welding ends of the M-1th layer that are radially adjacent to the second end of the stator core in the axial direction are the first connection welding ends, and the welding ends of the Mth layer that are radially adjacent to the second end of the stator core in the axial direction are the second connection welding ends. The sum of the span of the first connection welding ends and the span of the second connection welding ends is 6, and M is an even number.

[0025] The present invention also provides an electric motor, including the above-described motor stator.

[0026] According to the technical solution of the present invention, a motor stator includes: a stator core having a plurality of slots formed on the radial inner surface of the stator core and spaced apart by a predetermined slot pitch along the circumferential direction of the stator core; a stator winding having two slots per pole per phase, the stator winding including a plurality of phase windings mounted on the stator core so that they are different from each other in electrical phase; each phase winding consists of three branch windings connected in parallel sequentially along the circumferential direction of the stator core; one of the three branch windings of each phase winding includes: a first conductor group, a plurality of second conductor groups, a plurality of third conductor groups, and a fourth conductor group, or one of the three branch windings of each phase winding includes: a plurality of second conductor groups, a plurality of third conductor groups, and a fourth conductor group, or the three branch windings of each phase winding... One branch winding of the group includes: one first conductor group, multiple second conductor groups, and multiple third conductor groups. Each slot is divided into M radially distributed layers based on the number of slots that can be accommodated along the stator core's radial direction, where M is an even number greater than or equal to 6. The first conductor group of each branch winding is located in the Mth radial layer of the stator core, and the fourth conductor group of the same branch winding is located in the first radial layer of the stator core. Each conductor group includes multiple conductors, and each conductor group's conductors include: two welded ends located in two slots of the stator core separated by a specified slot spacing; two welded ends located in the two slots connecting the conductor to the second axial end of the stator core; and two plug-in ends located in the two slots connecting the conductor to the first axial end of the stator core. The welded ends of the lead wires of each branch winding of each phase winding are located at the first axial end of the stator core. By employing multiple conductor groups and parallel conductor connections, and by adopting a completely symmetrical structure in the magnetic circuit, the loop current problem caused by the asymmetrical structure is eliminated, torque fluctuations are reduced, noise is reduced, manufacturing processes are simplified, production costs are reduced, and processing efficiency is improved. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the motor stator provided in Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of a phase winding provided in Embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the fourth conductor group provided in Embodiment 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the conductor of the first conductor group provided in Embodiment 1 of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the conductor of the second conductor group provided in Embodiment 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the conductor of the third conductor group provided in Embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the third conductor group provided in Embodiment 2 of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the second conductor group provided in Embodiment 4 of the present invention;

[0036] Figure 9 This is a schematic diagram of the planar distribution of the insertion terminals of a phase winding provided in Embodiment 1 of the present invention;

[0037] Figure 10 This is a schematic diagram of the planar distribution of the insertion terminals of a phase winding provided in Embodiment 2 of the present invention;

[0038] Figure 11 This is a schematic diagram of the planar distribution of the insertion terminals of a phase winding provided in Embodiment 3 of the present invention;

[0039] Figure 12 This is a schematic diagram of the planar distribution of the insertion terminals of a phase winding provided in Embodiment 4 of the present invention;

[0040] Figure 13 This is a schematic diagram of the planar distribution of the insertion terminals of a phase winding provided in Embodiment 5 of the present invention;

[0041] Figure 14 This is a schematic diagram of the planar distribution of the insertion terminals of a phase winding provided in Embodiment Six of the present invention;

[0042] Figure 15 This is a schematic diagram of the planar distribution of the welding ends of a phase winding provided in Embodiments 1 to 6 of the present invention;

[0043] Figure 16 This is a schematic diagram of the planar distribution of a phase winding provided in Embodiment 7 of the present invention;

[0044] Figure 17 This is a schematic diagram of the planar distribution of a phase winding provided in Embodiment 8 of the present invention;

[0045] Figure 18This is a schematic diagram of the planar distribution of a phase winding provided in Embodiment 9 of the present invention;

[0046] Figure 19 This is a schematic diagram of the three phase windings connected in a star configuration according to an embodiment of the present invention;

[0047] Figure 20 This is a schematic diagram of the three phase windings connected in a delta configuration according to an embodiment of the present invention; Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish different objects, not to limit a specific order. The various embodiments of this invention described below can be performed individually or in combination with each other; the embodiments of this invention do not impose specific limitations in this regard.

[0050] In this application, the pitch is the circumferential interval between the two slots 301 of the same conductor, or the pitch is the sum of the span between the slots 301 corresponding to one weld end of one conductor and the span between the slots 301 corresponding to one weld end of another conductor. It should be noted that in this application, the first radial inner layer of the stator core can be either the first inner layer in the axial direction away from the center of the stator core or the first inner layer in the axial direction close to the center of the stator core.

[0051] like Figure 1 As shown, an embodiment of the present invention provides a motor stator, including: a stator core 20, wherein the stator core 20 has a plurality of slots 21 formed on the radial inner surface of the stator core and spaced apart by a predetermined slot pitch along the circumferential direction of the stator core;

[0052] like Figures 1 to 2 , Figures 9 to 20 As shown, the stator winding 10 includes multiple phase windings mounted on the stator core 20 so that they are different from each other in electrical phase, and forms an even number of layers in the radial direction of the stator core 20. In this embodiment, the phase windings (U-phase winding, V-phase winding, or W-phase winding) are divided into 6 layers distributed radially according to the number of slots that each slot can accommodate along the radial direction of the stator core; it should be noted that the above-mentioned even number of layers can be six, eight, or more. In this embodiment, the motor stator is the motor stator of a hairpin motor.

[0053] Combination Figures 1 to 20In embodiments one through nine, the stator winding 10 is mounted on the stator core 20. Multiple phase windings are mounted on the stator core 20 so that their electrical phases are different from each other. The stator winding 10 is a three-phase winding (i.e., U-phase winding, V-phase winding, and W-phase winding), with at least two slots per pole per phase. Each magnetic pole of the rotor has two slots 21. In this embodiment, the number of slots per pole per phase is two. The rotor has twelve magnetic poles, and this applies to each phase of the three-phase stator winding 10. The number of slots 21 in the stator core 20 is 72 (i.e., 2 x 12 x 3). Since there are two slots per pole per phase, the pole pitch = 2 x 3 = 6, meaning the pole pitch of the stator winding 2 is six. The number of slots per pole per phase = total number of stator slots / (number of magnetic poles x number of phases). The total number of stator slots is 72, the number of magnetic poles is twelve, and the number of phases is three. It should be noted that the number of magnetic poles of stator winding 2 is not limited to 12. It only needs to satisfy that the corresponding number of magnetic poles is an even number greater than 6 and divisible by 3. The corresponding number of poles is an even number greater than 6 and divisible by 3, which can be 12, 18, or 24, etc. Each phase winding of the stator winding consists of 3 branch windings connected in parallel along the circumference of the stator core.

[0054] Furthermore, in this embodiment, the stator core 20 is defined by two adjacent slots 21, forming a tooth 22. The stator core 20 is formed by stacking multiple annular magnetic steel plates to create two end faces 25 and 26 in the axial direction of the stator core. Other conventional metal plates can also be used instead of magnetic steel plates.

[0055] Combination Figure 9 In Embodiment 1, the first branch winding of each phase winding comprises one first conductor group, five second conductor groups, four third conductor groups, and one fourth conductor group; the second branch winding of the same phase winding comprises one first conductor group, five second conductor groups, four third conductor groups, and one fourth conductor group; and the third branch winding of the same phase winding comprises one first conductor group, five second conductor groups, four third conductor groups, and one fourth conductor group. In other words, at least one branch winding of the phase winding comprises one first conductor group, multiple second conductor groups, multiple third conductor groups, and one fourth conductor group. Figure 17 In Embodiment Eight, the first branch winding of the three parallel branch windings of each phase winding includes one first conductor group, six second conductor groups, three third conductor groups, and one fourth conductor group. The third branch winding of the three parallel branch windings of each phase winding includes one first conductor group, six second conductor groups, four third conductor groups, and zero fourth conductor groups. That is, at least one branch winding of the three parallel branch windings of this phase winding includes one first conductor group, multiple second conductor groups, and multiple third conductor groups. Accordingly, combined with... Figure 18In Embodiment Nine, the third branch winding of each phase winding comprises 0 first conductor groups, 6 second conductor groups, 4 third conductor groups, and 1 fourth conductor group. That is, at least one branch winding of the three parallel branch windings of this phase winding comprises multiple second conductor groups, multiple third conductor groups, and 1 fourth conductor group. Figure 3 , Figure 4 , Figures 9 to 18 As shown, in Embodiments 1 to 9, the first conductor group of each branch winding is located in the sixth radial layer of the stator core, and the fourth conductor group of the branch winding is located in the first radial layer of the stator core.

[0056] Combination Figures 3 to 8 In this embodiment, the first conductor group includes: two identical first conductors 150, each first conductor 150 including two slot interiors 301 located in the same layer of the stator core radially and separated by a predetermined slot spacing, two welding ends 303 located at the second end 25 of the stator core axially and connecting the two slot interiors 301 of the conductor, and a plug end 302 located at the first end 26 of the stator core axially and connecting the two slot interiors 301 of the conductor; two welding ends 303 located outside the slots and extending in the same direction (both to the left), the two welding ends 303 located at the outer end 25 of the slot axially and connecting the two slot interiors 301 of the conductor in the same layer, the two slot interiors of the first conductor are located in the sixth layer of the innermost layer of the stator core radially, that is, the first conductor group is located in the Mth layer of the stator core radially (M is 6 in this embodiment).

[0057] In this embodiment, the fourth conductor group includes: a fourth large conductor 100A and a fourth small conductor 100B. Each conductor in the fourth conductor group includes two slot interiors 301 located in the same layer of the stator core radially and separated by a predetermined slot spacing; two welding ends 303 located at the second end 25 of the stator core axially and connecting to the two slot interiors 301 of the conductor; and a plug end 302 located at the first end 26 of the stator core axially and connecting to the two slot interiors 301 of the conductor. Two welding ends 303 located outside the slots and extending in the same direction (both to the right) are located at the outer end 25 of the slot 21 and connected to the two slot interiors 301 of the conductor in the same layer. The two slot interiors of each conductor in the fourth conductor group are located in the first layer of the innermost layer of the stator core radially.

[0058] In Embodiments 1 to 3, the second conductor group includes: two identical second conductors 350, each second conductor 350 including two slot interiors 301 located in two adjacent layers of the stator core with a specified slot spacing, two welding ends 303 located at the second axial end 25 of the stator core connecting the conductor to the two slot interiors 301, and a plug end 302 located at the first axial end 26 of the stator core connecting the conductor to the two slot interiors 301; two welding ends 303 located outside the slot and extending in opposite directions (the two welding ends extend in opposite directions), the two welding ends 303 located at the outer axial end 25 of the slot 21 and respectively connected to the two slot interiors 301 of the conductor in the same layer.

[0059] In embodiments four to six, the second conductor group includes: a fifth large conductor 300A and a fifth small conductor 300B. Each conductor in the fifth large conductor 300A and the fifth small conductor 300B of the second conductor group includes two slot interiors 301 located in two adjacent layers of the stator core with a specified slot spacing, two welding ends 303 located at the second axial end 25 of the stator core and connecting to the two slot interiors 301 of the conductor, and a plug end 302 located at the first axial end 26 of the stator core and connecting to the two slot interiors 301 of the conductor; two welding ends 303 located outside the slot and extending in opposite directions (the two welding ends extend in opposite directions), and the two welding ends 303 located at the outer axial end 25 of the slot 21 and connecting to the two slot interiors 301 of the conductor in the same layer.

[0060] In an embodiment, the third conductor group includes: two conductors, each conductor including two slot interiors 301 located in two adjacent layers of the stator core with a specified slot spacing, two welding ends 303 located at the second axial end 25 of the stator core connecting the conductor to the two slot interiors 301, and a plug end 302 located at the first axial end 26 of the stator core connecting the conductor to the two slot interiors 301; and two welding ends 303 located outside the slots and extending in opposite directions (the two welding ends extending in opposite directions), the two welding ends 303 located at the outer axial end 25 of the slot 21 respectively connecting to the two slot interiors 301 of the conductor in the same layer.

[0061] Combination Figures 9 to 16 In this embodiment, the welded end 303 connecting the leads of the three branch windings (U1, U2, U3, U4, U5, U6) of each phase winding is located at the first axial end 26 of the stator core. By employing a completely symmetrical structure in the magnetic circuit through the winding structure, the loop current problem caused by the asymmetrical structure is eliminated, torque fluctuations are reduced, noise is reduced, manufacturing processes are simplified, production costs are lowered, and processing efficiency is improved.

[0062] Combination Figures 9 to 14In embodiments one through six, the welded ends of the lead wires of each branch winding are located in two adjacent radial layers of the stator core and at the first circumferential end 26 of the stator core. The welded ends of the lead wires U1 and U2 of the first branch winding of each phase winding are located in the sixth radial layer of the stator core, and the welded ends of the lead wires U2 and U3 of the branch winding are located in the fifth radial layer of the stator core. The welded ends of the lead wires U3 and U4 of the second branch winding of the phase winding are located in the fourth radial layer of the stator core, and the welded ends of the lead wires U4 and U4 of the second branch winding of the phase winding are located in the third radial layer of the stator core. The welding end connected to the lead end U5 of the third branch winding of the group is located in the second radial layer of the stator core, and the welding end connected to the output end U6 of the third branch winding of this phase winding is located in the first radial layer of the stator core; that is, the welding ends connected to the lead ends of the three branch windings are located in two adjacent radial layers of the stator core, and are located at the first axial end 26 of the stator core. The welding ends connected to the lead ends of the three branch windings of this phase winding are all located in the Nth and N+1th radial layers of the stator core, that is, the welding ends connected to the lead ends of at least one branch winding in each phase winding are located in the Nth and N+1th radial layers of the stator core. It should be noted that in embodiments one to six, the welding ends connected to the lead ends of the three branch windings of each phase winding are all located in the same radial direction of the stator core, but the welding ends connected to the lead ends of the three branch windings of each phase winding may not be located in the same radial direction of the stator core, such as... Figure 16 As shown in Embodiment 7, the welded ends connecting the lead wire of the first branch winding of the three branch windings of the phase winding to the lead wires of the other two branch windings of the phase winding are not located in the same radial direction of the stator core.

[0063] like Figure 17As shown, in Embodiment 8, the welded end connected to the lead end U1 of the first branch winding of each phase winding is located in the 6th radial layer of the stator core, and the welded end connected to the output end U2 of this branch winding is located in the 6th radial layer of the stator core; the welded end connected to the lead end U3 of the second branch winding of this phase winding is located in the 4th radial layer of the stator core, and the welded end connected to the output end U4 of this branch winding is located in the 5th radial layer of the stator core; the welded end connected to the lead end U5 of the third branch winding of this phase winding is located in... The welded end of the branch winding connected to the lead wire U6 of the second radial layer of the stator core is located in the third radial layer of the stator core; that is, the welded end of the lead wire of each branch winding is located at the first axial end 26 of the stator core. The welded ends of the lead wires of the second and third branch windings of this phase winding are both located in the (N+1)th and (N+2)th radial layers of the stator core, respectively. In other words, the welded end of the lead wire of at least one branch winding in each phase winding is located in the (N+1)th and (N+2)th radial layers of the stator core. It should be noted that in Embodiment 8, the lead wires of the three branch windings of this phase winding are all located in the same radial direction of the stator core, but the lead wires of the three branch windings of each phase winding may not be located in the same radial direction of the stator core. Of course, the lead wire of the first branch winding of the three branch windings of this phase winding is not located in the same radial direction of the stator core as the lead wires of the other two branch windings of this phase winding. Furthermore, in Embodiment 8, the welded ends of the lead wires of the first branch winding of the phase winding are all located in the 6th layer of the stator core radially, that is, the welded ends of the lead wires of at least one branch winding in each phase winding are located in the Mth layer of the same layer in the stator core radially.

[0064] like Figure 18As shown, in Embodiment Nine, the welded end connected to the lead end U1 of the first branch winding of each phase winding is located in the 4th radial layer of the stator core, and the welded end connected to the output end U2 of this branch winding is located in the 5th radial layer of the stator core; the welded end connected to the lead end U3 of the second branch winding of this phase winding is located in the 2nd radial layer of the stator core, and the welded end connected to the output end U4 of this branch winding is located in the 3rd radial layer of the stator core; the welded end connected to the lead end U5 of the third branch winding of this phase winding is located in the 4th radial layer of the stator core. The first radial layer of the stator core, the welded end connected to the lead-out terminal U6 of this branch winding is located in the first radial layer of the stator core; that is, the welded end connected to the lead-out terminal of each branch winding is located in the first axial end 26 of the stator core. The welded ends connected to the lead-out terminals of the first and second branch windings of this phase winding are both located in the (N+1)th and (N+2)th radial layers of the stator core, respectively. That is, the welded ends connected to the lead-out terminals of at least one branch winding in each phase winding are located in the (N+1)th and (N+2)th radial layers of the stator core. It should be noted that in Embodiment Nine, the lead-out terminals of the three branch windings of this phase winding are all located in the same radial direction of the stator core, but the lead-out terminals of the three branch windings of each phase winding may not be located in the same radial direction of the stator core. Of course, the lead-out terminal of the first branch winding of the three branch windings of this phase winding is not located in the same radial direction of the stator core as the lead-out terminals of the other two branch windings of this phase winding. Furthermore, in Embodiment Nine, the welded ends of the lead wires of the third branch winding of the phase winding are all located in the first layer of the same radial layer of the stator core, that is, the welded ends of the lead wires of at least one branch winding in each phase winding are located in the first radial layer of the stator core.

[0065] Each branch winding also includes two eighth conductors, each comprising a slot interior 301 and two welded ends 303 located at the first axial end 26 and the second axial end 25 of the stator core, connecting to the slot interior 301. The two welded ends at the two axial ends of the stator core are located in the same radial layer as the slot interior of the stator core. The eighth conductor connected to the lead end of each branch winding is located at the welded end of the first axial end 26 of the stator core, and the other eighth conductor connected to the output end of the branch winding is also located at the welded end of the first axial end 26 of the stator core.

[0066] Combination Figures 9 to 14In embodiments one through six, each branch winding further includes one conductor from a second conductor group. In embodiments one through three, each branch winding includes one conductor from a second conductor group, designated as second conductor 350. In embodiments four through six, each branch winding includes one conductor from a second conductor group, designated as sixth small conductor 300B. Alternatively, in embodiments four through six, each branch winding may include one conductor from a second conductor group, designated as sixth large conductor 300A. In embodiments one through six, the slot 301 corresponding to the welded end connected to the lead end of the first branch winding of each phase winding is located in the stator iron. The 19th slot of the sixth layer of the stator core and a conductor of a second conductor group are located inside the 20th slot of the sixth layer of the stator core, which are located in two adjacent slots circumferentially adjacent to the stator core. The slot 301 corresponding to the welded end of the lead wire connection of the first branch winding of each phase is located inside the 25th slot of the fifth layer of the stator core and a conductor of a second conductor group is located inside the 26th slot of the fifth layer of the stator core, which are located in two adjacent slots circumferentially adjacent to the stator core. That is, the slot corresponding to the welded end of the lead wire connection of the first branch winding and the two slots of a conductor of a second conductor are located in two adjacent slots circumferentially adjacent to the stator core. Correspondingly, combined with Figures 9 to 14 The slots corresponding to the welded ends of the second and third branch windings of the phase winding and the two slots of a conductor of a second conductor group are located in two adjacent slots in the circumferential direction of the stator core.

[0067] Combination Figure 17 In Embodiment 8, one of the three branch windings of each phase winding further includes a conductor from a third conductor group. In Embodiments 1 and 4, each branch winding includes a conductor from a third conductor group, designated as third conductor 250. In Embodiments 2 and 5, one of the three branch windings of each phase winding includes a conductor from a third conductor group, designated as sixth small conductor 200B. Of course, in Embodiments 2 and 5, one of the three branch windings of each phase winding includes a conductor from a third conductor group, designated as sixth large conductor 200A. In Embodiment 8, the lead end of the second branch winding of this phase winding is connected to... The slot 301 corresponding to the welding end is located in the 31st slot of the fourth layer of the stator core, and the slot of a conductor of a third conductor group is located in the 32nd slot of the fourth radial layer of the stator core, which are located in two adjacent slots in the circumferential direction of the stator core. The slot 301 corresponding to the welding end connected to the lead end of the second branch winding of this phase winding is located in the 37th slot of the fifth layer of the stator core, and the slot of a conductor of a third conductor group is located in the 38th slot of the fifth layer of the stator core, which are located in two adjacent slots in the circumferential direction of the stator core. That is, the slot corresponding to the welding end connected to the lead of the second branch winding and the two slots of a conductor of a third conductor group are located in two adjacent slots in the circumferential direction of the stator core.

[0068] Combination Figure 17 In embodiment eight, one branch winding of the three branch windings of each phase winding includes a conductor of the first conductor group, and one branch winding of the three branch windings of each phase winding includes a conductor of the first conductor group, which is the first conductor 150. Figure 17 In Embodiment 8, the slot 301 corresponding to the welding end of the lead wire connection of the first branch winding of the phase winding is located in the 31st slot of the sixth layer of the stator core, and the slot of the conductor of the first conductor group is located in the 32nd slot of the sixth layer of the stator core, which are located in two adjacent slots in the circumferential direction of the stator core. The slot 301 corresponding to the welding end of the lead wire connection of the first branch winding of the phase winding is located in the 37th slot of the sixth layer of the stator core, and the slot of the conductor of the first conductor group is located in the 38th slot of the sixth layer of the stator core, which are located in two adjacent slots in the circumferential direction of the stator core. That is, the slot corresponding to the welding end of the lead wire connection of the first branch winding and the two slots of the conductor of the first conductor group are located in two adjacent slots in the circumferential direction of the stator core.

[0069] Combination Figure 18 In embodiment nine, one branch winding of each phase winding includes a conductor from the fourth conductor group. This fourth conductor group, denoted as the fourth small conductor 100B, can also be the fourth large conductor 100A. (This is in conjunction with...) Figure 18 The slot 301 corresponding to the welding end of the lead wire connection of the third branch winding of the phase winding is located in the 37th slot of the first layer of the stator core, and the slot of a conductor of the fourth conductor group is located in the 38th slot of the first layer of the stator core, which are located in two adjacent slots in the circumferential direction of the stator core. The slot 301 corresponding to the welding end of the lead wire connection of the first branch winding of the phase winding is located in the 44th slot of the first layer of the stator core, and the slot of a conductor of the fourth conductor group is located in the 43rd slot of the first layer of the stator core, which are located in two adjacent slots in the circumferential direction of the stator core. That is, the slot corresponding to the welding end of the lead wire connection of the third branch winding of the phase winding and the two slots of a conductor of the fourth conductor group are located in two adjacent slots in the circumferential direction of the stator core.

[0070] Furthermore, the first conductor group includes two first conductors. The two slots of the first first conductor 150 of the first conductor group are located in the 7th and 13th slots of the 6th layer of the stator core. The two slots of the second first conductor 150 of the first conductor group are located in the 8th and 14th slots of the radial 6th layer of the stator core. That is, the pitch between the two slots of the two first conductors of the first conductor group is a whole pitch. The two slots of the two first conductors 150 of the first conductor group are located in two adjacent slots in the circumferential direction of the sixth layer of the stator core, respectively. The two slots of the fourth large conductor 100A in the fourth conductor group are located in slots 13 and 20 of the first radial layer of the stator core. The two slots of the fourth small conductor 100B in the fourth conductor group are located in slots 14 and 19 of the first radial layer of the stator core. That is, the pitch between the two slots of the fourth large conductor in the fourth conductor group is a long pitch of 7, and the pitch between the two slots of the fourth small conductor in the fourth conductor group is a short pitch of 5. The two slots of the fourth large conductor 100A in the fourth conductor group are located in the two slots surrounding the fourth small conductor 100B in the first circumferential layer of the stator core.

[0071] Combination Figure 9 , Figure 15As shown, in Embodiment 1, each phase winding (U-phase winding, V-phase winding, or W-phase winding) includes 12 third conductor groups, i.e., it contains 12 identical third conductor groups. When the even-numbered layers are 8, the U-phase winding includes 18 third conductor groups. Each phase winding (U-phase winding, V-phase winding, or W-phase winding) has multiple first and second connection welded ends connected together. The welded end located in the first radial layer of the stator core is the first connection welded end, the welded end located in the second radial layer of the stator core is the second connection welded end, the welded end located in the third radial layer of the stator core is the first connection welded end, the welded end located in the fourth radial layer of the stator core is the second connection welded end, and the welded end located in the fifth radial layer of the stator core is the second connection welded end. The first connection welding end is located at the welding end in the sixth radial layer of the stator core, and the second connection welding end is located at the welding end in the sixth radial layer of the stator core. The sum of the spans of the first connection welding ends and the second connection welding ends adjacent in the same radial direction of the stator core is a whole pitch of 6. Specifically, the pitch connecting the first connection welding end of a welding end of a first conductor 150 or a second conductor 350 located in the sixth radial layer of the stator core to the second connection welding end of a welding end of a second conductor 350 or a third conductor 250 located in the fifth radial layer of the stator core is a whole pitch of 6. The other welding end of a second conductor 350 or a third conductor 250 located in the fourth radial layer of the stator core is... The pitch between the first connecting weld end and the second connecting weld end of a second conductor 350 or a third conductor 250 located in the same radial adjacent third layer of the stator core is a whole pitch of 6. The pitch between the first connecting weld end of the other welding end of a second conductor 350 or a third conductor 250 located in the same radial adjacent first layer of the stator core and the second connecting weld end of a second conductor 350 or a fourth large conductor 100A or a fourth small conductor 100B located in the same radial adjacent first layer of the stator core is a whole pitch of 6. The two conductors of the second conductor group are the same second conductor, and the second conductor of the second conductor group is located in the first radial layer of the stator core and the second connecting weld end of the second conductor group is located in the first radial layer of the stator core and the second connecting weld end of the third conductor 350 or a third conductor 250 located in the same radial adjacent first layer of the stator core is a whole pitch of 6. In the second, third, and fourth layers, the two slots of the first second conductor 350 in the second conductor group are located in slots 1 and 7 respectively, and the two slots of the second second conductor 350 in the second conductor group are located in slots 2 and 8 respectively. That is, the pitch between the two slots of the second conductor is a whole pitch 6. The two conductors of the third conductor group are the same third conductor 250, and the third conductor of the third conductor group is located in the third and second layers of the stator core radially. The two slots of the first third conductor 250 in the third conductor group are located in core slots 19 and 25, and the two slots of the second third conductor 250 in the third conductor group are located in core slots 20 and 26. That is, the pitch between the two slots of the third conductor 250 is a whole pitch.

[0072] Combination Figure 10 , Figure 15As shown, in Embodiment 2, the phase winding (U-phase winding, V-phase winding, or W-phase winding) includes 12 identical third conductor groups. When the even-numbered layers are 8, the U-phase winding includes 18 third conductor groups. The phase winding (U-phase winding, V-phase winding, or W-phase winding) has multiple first and second connection welding ends connected together. The welding end located in the first radial layer of the stator core is the first connection welding end, the welding end located in the second radial layer of the stator core is the second connection welding end, the welding end located in the third radial layer of the stator core is the first connection welding end, and the welding end located in the fourth radial layer of the stator core is the second connection welding end. The welding end, located in the fifth radial layer of the stator core, is the first connecting welding end, and the welding end located in the sixth radial layer of the stator core is the second connecting welding end. The sum of the span of the first connecting welding ends and the span of the second connecting welding ends adjacent in the same radial direction of the stator core is the whole pitch 6. Specifically, the first connecting welding end of a welding end of a first conductor 150 or a second conductor 350 located in the sixth radial layer of the stator core is connected to the second connecting welding end of a welding end of a second conductor 350, a sixth large conductor 200A, or a sixth small conductor 200B located in the fifth radial layer of the stator core. The pitch of the end connection is a whole pitch of 6. The first connection welding end of the second conductor 350, the sixth large conductor 200A, or the sixth small conductor 200B located in the fourth layer of the same radial direction of the stator core is connected to the second connection welding end of the second conductor 350, the sixth large conductor 200A, or the sixth small conductor 200B located in the adjacent third layer of the same radial direction of the stator core with a pitch of a whole pitch of 6. The first connection welding end of the second conductor 350, the sixth large conductor 200A, or the sixth small conductor 200B located in the second layer of the same radial direction of the stator core with a pitch of a whole pitch of 6. The pitch of the second connecting weld end connected to the weld end of the second conductor 350, or a fourth large conductor 100A, or a fourth small conductor 100B located in the first layer of the same radial direction of the stator core is a whole pitch of 6; the two conductors of the second conductor group are the same second conductor, and the second conductors of the second conductor group are located in the first, second, third, and fourth layers of the stator core in the radial direction. The two slots of the first second conductor 350 of the second conductor group are located in slots 1 and 7 respectively, and the two slots of the second second conductor 350 of the second conductor group are located in slots 2 and 8 respectively. That is, the pitch between the two slots of the second conductor is a whole pitch of 6.The two conductors in the third conductor group are a different sixth large conductor 200A and a sixth small conductor 200B. These two conductors are located in the third and second radial layers of the stator core, respectively. The two slots of the sixth large conductor 200A are located in core slots 19 and 26, respectively, while the two slots of the sixth small conductor 200B are located in core slots 20 and 25, respectively. That is, the pitch between the two slots of the sixth large conductor 200A is a long pitch, and the pitch between the two slots of the sixth small conductor 200B is a short pitch. The two slots of the sixth large conductor 200A surround the sixth small conductor 200B of the third conductor group.

[0073] Combination Figure 11 , Figure 15As shown, in Embodiment 3, the phase winding (U-phase winding, V-phase winding, or W-phase winding) includes 12 third conductor groups, which are not the same. When the even-number of layers is 8, the U-phase winding includes 18 third conductor groups. The phase winding (U-phase winding, V-phase winding, or W-phase winding) has multiple first connection welding ends and second connection welding ends connected together. The welding end located in the first radial layer of the stator core is the first connection welding end, the welding end located in the second radial layer of the stator core is the second connection welding end, the welding end located in the third radial layer of the stator core is the first connection welding end, and the welding end located in the fourth radial layer of the stator core is the second connection welding end. The first connecting weld end is located at the fifth radial layer of the stator core, and the second connecting weld end is located at the sixth radial layer of the stator core. The sum of the spans of the first and second connecting weld ends adjacent to each other in the same radial direction of the stator core is the whole pitch 6. Specifically, the first connecting weld end of a weld end of a first conductor 150 or a second conductor 350 located in the sixth radial layer of the stator core is connected to the second connecting weld end of a weld end of a second conductor 350, a third conductor 250, a sixth large conductor 200A, or a sixth small conductor 200B located in the fifth radial layer of the stator core. The pitch of the connecting weld ends is a whole pitch of 6. The first connecting weld end of one weld end of a second conductor 350, a sixth large conductor 200A, or a sixth small conductor 200B located in the fourth layer of the same radial direction of the stator core is connected to the second connecting weld end of one weld end of a second conductor 350, a sixth large conductor 200A, or a sixth small conductor 200B located in the adjacent third layer of the same radial direction of the stator core with a pitch of a whole pitch of 6. The first connecting weld end of one weld end of a second conductor 350, a sixth large conductor 200A, or a sixth small conductor 200B located in the second layer of the same radial direction of the stator core with a pitch of a whole pitch of 6. The pitch connecting the welding end to the second connecting welding end of a second conductor 350, a fourth large conductor 100A, or a fourth small conductor 100B located in the same radial adjacent first layer of the stator core is a whole pitch of 6; the two conductors of the second conductor group are the same second conductor, and the second conductors of the second conductor group are located in the first, second, third, and fourth radial layers of the stator core; the two slots of the first second conductor 350 of the second conductor group are located in slots 1 and 7 respectively, and the two slots of the second second conductor 350 of the second conductor group are located in slots 2 and 8 respectively, that is, the pitch between the two slots of the second conductor is a whole pitch of 6;The first and third conductor groups are identical. The two conductors in the first third conductor group are different sixth large conductor 200A and sixth small conductor 200B. The two conductors in the third conductor group are located in the third and second radial layers of the stator core. The two slots of the sixth large conductor 200A in the third conductor group are located in core slots 19 and 26, respectively. The two slots of the sixth small conductor 200B in the third conductor group are located in core slots 20 and 25, respectively. That is, the pitch between the two slots of the sixth large conductor 200A is a long pitch, and the pitch between the two slots of the sixth small conductor 200B is a short pitch. The six large conductor 200A of the third conductor group surrounds the six small conductor 200B of the same third conductor group within its two slots. There are six identical second and third conductor groups, where the two conductors of the first third conductor group are identical third conductors 250, and the third conductors of the third conductor group are located in the third and second radial layers of the stator core. The two slots of the first third conductor 250 of the third conductor group are located in core slots 19 and 25, and the two slots of the second third conductor 250 of the third conductor group are located in core slots 20 and 26. That is, the pitch between the two slots of the third conductor 250 is a whole pitch.

[0074] Combination Figure 12 , Figure 15As shown, in Embodiment 4, the phase winding (U-phase winding, V-phase winding, or W-phase winding) includes 12 third conductor groups, all 12 of which are identical. When the even-numbered layers are 8, the U-phase winding includes 18 third conductor groups. The phase winding (U-phase winding, V-phase winding, or W-phase winding) has multiple first connection welding ends and second connection welding ends connected together. The welding end located in the first radial layer of the stator core is the first connection welding end, the welding end located in the second radial layer of the stator core is the second connection welding end, the welding end located in the third radial layer of the stator core is the first connection welding end, and the welding end located in the fourth radial layer of the stator core is the second connection welding end. The welding end of the fifth radial layer of the stator core is the first connecting welding end, and the welding end of the sixth radial layer of the stator core is the second connecting welding end. The sum of the span of the first connecting welding ends and the span of the second connecting welding ends adjacent in the same radial direction of the stator core is the whole pitch 6. Specifically, the first connecting welding end of a welding end of a first conductor 150, a fifth large conductor 300A, or a fifth small conductor 300B located in the sixth radial layer of the stator core is connected to the second connecting welding end of a welding end of a fifth large conductor 300A, a fifth small conductor 300B, or a third conductor 250 located in the fifth radial layer of the stator core. The pitch is a whole pitch of 6. The first connecting weld end of one welded end of a fifth large conductor 300A or fifth small conductor 300B or a third conductor 250 located in the fourth layer of the same radial direction of the stator core is connected to the second connecting weld end of one welded end of a fifth large conductor 300A or fifth small conductor 300B or a third conductor 250 located in the adjacent third layer of the same radial direction of the stator core. The first connecting weld end of the other welded end of a fifth large conductor 300A or fifth small conductor 300B or a third conductor 250 located in the second layer of the same radial direction of the stator core is connected to the second connecting weld end of one welded end of a welded end of a welded end in the adjacent first layer of the same radial direction of the stator core. The pitch of the second connection welded end of one welded end of the fifth large conductor 300A or the fifth small conductor 300B or the fourth large conductor 100A or the fourth small conductor 100B is a whole pitch of 6; the second conductor group consists of two different fifth large conductors and fifth small conductors, and the conductors of the second conductor group are located in the first, second, third and fourth radial layers of the stator core. The two slots of the fifth large conductor of the second conductor group are located in core slots 1 and 8, respectively, and the two slots of the fifth small conductor of the second conductor group are located in slots 2 and 7, respectively. That is, the pitch between the two slots of the fifth large conductor is a long pitch of 7, and the pitch between the two slots of the fifth small conductor is a short pitch of 5.The two conductors in the third conductor group are the same third conductor 250, and the third conductors of the third conductor group are located in the third and second radial layers of the stator core. The two slots of the first third conductor 250 in the third conductor group are located in core slots 19 and 25, and the two slots of the second third conductor 250 in the third conductor group are located in core slots 20 and 26. That is, the pitch between the two slots of the third conductor 250 is a whole pitch.

[0075] Combination Figure 13 , Figure 15As shown, in Embodiment 5, the phase winding (U-phase winding, V-phase winding, or W-phase winding) includes 12 identical third conductor groups. When the even-numbered layers are 8, the U-phase winding includes 18 third conductor groups. The phase winding (U-phase winding, V-phase winding, or W-phase winding) has multiple first and second connection welding ends connected together. The welding end located in the first radial layer of the stator core is the first connection welding end, the welding end located in the second radial layer of the stator core is the second connection welding end, the welding end located in the third radial layer of the stator core is the first connection welding end, the welding end located in the fourth radial layer of the stator core is the second connection welding end, and the welding end located in the fifth radial layer of the stator core is the first connection welding end. The welding end located in the sixth radial layer of the stator core is the second connecting welding end. The sum of the spans of the first connecting welding ends and the second connecting welding ends adjacent in the same radial direction of the stator core is the whole pitch 6. Specifically, the pitch connecting the first connecting welding end of a welding end of a first conductor 150, a fifth large conductor 300A, or a sixth small conductor 300B located in the sixth radial layer of the stator core to the second connecting welding end of a welding end of a fifth large conductor 300A, a fifth small conductor 300B, a sixth large conductor 200A, or a sixth small conductor 200B located in the fifth radial layer of the stator core is the whole pitch 6. The pitch connecting the first connecting end of one welded end of a fifth large conductor 300A, a fifth small conductor 300B, a sixth large conductor 200A, or a sixth small conductor 200B in the fourth layer to the second connecting end of one welded end of a fifth large conductor 300A, a fifth small conductor 300B, a sixth large conductor 200A, or a sixth small conductor 200B in the third layer, located in the same radial direction as the stator core, is a whole pitch of 6. The first connecting end of the other welded end of one welded end of a fifth large conductor 300A, a fifth small conductor 300B, a sixth large conductor 200A, or a sixth small conductor 200B in the second layer, located in the same radial direction as the stator core, is connected to the second connecting end of one welded end of a fifth large conductor 300A, a fifth small conductor 300B, a sixth large conductor 200A, or a sixth small conductor 200B in the third layer, located in the same radial direction as the stator core, to the second connecting end of one welded end of a ... The pitch of the second connection of the welding ends of the fifth large conductor 300A, a fifth small conductor 300B, a fourth large conductor 100A, or a fourth small conductor 100B in the first layer of the same radial direction of the stator core is a whole pitch of 6; the second conductor group consists of two different fifth large conductors and fifth small conductors, and the conductors of the second conductor group are located in the first, second, third, and fourth layers of the stator core in the radial direction. The two slots of the fifth large conductor of the second conductor group are located in slots 1 and 8, respectively, and the two slots of the fifth small conductor of the second conductor group are located in slots 2 and 7, respectively. That is, the pitch between the two slots of the fifth large conductor is a long pitch of 7, and the pitch between the two slots of the fifth small conductor is a short pitch of 5.The two conductors in the third conductor group are a different sixth large conductor 200A and a sixth small conductor 200B. These two conductors are located in the third and second radial layers of the stator core, respectively. The two slots of the sixth large conductor 200A are located in core slots 19 and 26, respectively, while the two slots of the sixth small conductor 200B are located in core slots 20 and 25, respectively. That is, the pitch between the two slots of the sixth large conductor 200A is a long pitch, and the pitch between the two slots of the sixth small conductor 200B is a short pitch. The two slots of the sixth large conductor 200A surround the sixth small conductor 200B of the third conductor group.

[0076] Combination Figure 14 , Figure 15In Embodiment Six, the phase winding (U-phase winding, V-phase winding, or W-phase winding) includes 12 third conductor groups, which are not the same. When the even-number of layers is 8, the U-phase winding includes 18 third conductor groups. The phase winding (U-phase winding, V-phase winding, or W-phase winding) has multiple first connection welding ends and second connection welding ends connected together. The welding end located in the first radial layer of the stator core is the first connection welding end, the welding end located in the second radial layer of the stator core is the second connection welding end, the welding end located in the third radial layer of the stator core is the first connection welding end, the welding end located in the fourth radial layer of the stator core is the second connection welding end, and the welding end located in the fifth radial layer of the stator core is the first connection welding end. The welding end of the sixth radial layer is the second connecting welding end. The sum of the span of the first connecting welding end and the second connecting welding end adjacent in the same radial direction of the stator core is the whole pitch 6. Specifically, the pitch connecting the first connecting welding end of a welding end of a first conductor 150, a fifth large conductor 300A, or a fifth small conductor 300B located in the sixth radial layer of the stator core to the second connecting welding end of a welding end of a fifth large conductor 300A, a fifth small conductor 300B, a third conductor 250, a sixth large conductor 200A, or a sixth small conductor 200B located in the fifth radial layer of the stator core is the whole pitch 6. The pitch connecting the first connecting welding end of a ... The pitch connecting the first connecting end of one welded end of the fifth large conductor 300A, or a fifth small conductor 300B, or a third conductor 250, or a sixth large conductor 200A, or a sixth small conductor 200B, to the second connecting end of one welded ... The pitch of the second connecting welding end of the terminal connected to a welding end of a fifth large conductor 300A, a fifth small conductor 300B, a fourth large conductor 100A, or a fourth small conductor 100B located in the first layer of the same radial direction of the stator core is a whole pitch of 6; the second conductor group consists of two different fifth large conductors and fifth small conductors, and the conductors of the second conductor group are located in the first, second, third, and fourth layers of the stator core in the radial direction. The two slots of the fifth large conductor of the second conductor group are located in slots 1 and 8, respectively, and the two slots of the fifth small conductor of the second conductor group are located in slots 2 and 7, respectively. That is, the pitch between the two slots of the fifth large conductor is a long pitch of 7, and the pitch between the two slots of the fifth small conductor is a short pitch of 5.The first and third conductor groups are identical. The two conductors in the first third conductor group are different sixth large conductors 200A. The conductors in the third conductor group are located in the third and second radial layers of the stator core. The sixth small conductor 200B is located in slots 19 and 26 of the core, and slots 20 and 25 of the core, respectively. That is, the pitch between the two slots of the sixth large conductor 200A is a long pitch, and the pitch between the two slots of the sixth small conductor 200B is a short pitch. The six large conductor 200A of the third conductor group surrounds the six small conductor 200B of the same third conductor group within its two slots; there are six identical second and third conductor groups, where the two conductors of the second third conductor group are identical third conductors 250, and the third conductors of the third conductor group are located in the third and second radial layers of the stator core. The two slots of the first third conductor 250 of the third conductor group are located in core slots 25 and 31, and the two slots of the second third conductor 250 of the third conductor group are located in core slots 26 and 32. That is, the pitch between the two slots of the third conductor 250 is a whole pitch.

[0077] For example, such as Figure 19 The image shows a star connection of the series windings of a motor, as shown. Figure 20 The figure shows the delta connection of the series windings of the motor.

[0078] This embodiment also provides a motor, including the motor stator described above, and a motor using the motor stator described above.

[0079] The motor provided in this embodiment of the invention includes the motor stator in the above embodiments. Therefore, the motor provided in this embodiment of the invention also has the beneficial effects described in the above embodiments, which will not be repeated here.

[0080] In the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium (bus connection); and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meanings of the above within the context of the present invention. Finally, it should be noted that the above are merely preferred embodiments of the present invention and the technical principles employed.

[0081] Those skilled in the art will understand that the present invention is not limited to the embodiments described herein, and various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A motor stator, comprising: A stator core having a plurality of slots formed on the radial inner surface of the stator core and spaced apart by a predetermined slot pitch along the circumferential direction of the stator core. The stator winding has 2 slots per pole per phase and includes multiple phase windings mounted on the stator core so that they are different from each other in electrical phase. Its features are: Each phase winding consists of three branch windings connected in parallel along the circumference of the stator core. At least one branch winding of the three-branch winding of each phase winding includes: one first conductor group, multiple second conductor groups, multiple third conductor groups, and one fourth conductor group; or at least one branch winding of the three-branch winding of each phase winding includes: multiple second conductor groups, multiple third conductor groups, and one fourth conductor group; or at least one branch winding of the three-branch winding of each phase winding includes: one first conductor group, multiple second conductor groups, and multiple third conductor groups. Each slot is divided into M radially distributed layers based on the number of slots that each slot can accommodate along the radial direction of the stator core, where M is an even number greater than or equal to 6. The first conductor group of each branch winding is located in the Mth layer of the stator core radially, and the fourth conductor group of the branch winding is located in the first layer of the stator core radially. Each conductor group includes multiple conductors, and each conductor group includes: two welded ends located inside two slots of the stator core separated by a specified slot spacing, two welded ends located inside the two slots of the stator core connected to the conductor at the second axial end of the stator core, and plug-in ends located inside the two slots of the stator core connected to the conductor at the first axial end of the stator core; The welded end of the lead wire connection of each branch winding of each phase winding is located at the first axial end of the stator core.

2. The motor stator according to claim 1, characterized in that, The welded ends of at least one branch winding lead wire of each phase winding are located in two adjacent radial layers of the stator core. The welded ends of the lead wire of the at least one branch winding are located in the Nth and N+1th radial layers of the stator core, or the welded ends of the lead wire of the at least one branch winding are located in the N+1th and N+2th radial layers of the stator core, where N is an odd number.

3. The motor stator according to claim 1, characterized in that, The welded end of the lead wire connection of at least one branch winding of each phase winding is located in the Mth layer or the first layer of the same radial layer of the stator core.

4. The motor stator according to any one of claims 2 to 3, characterized in that, One of the branch windings of each phase winding further includes a conductor of the first conductor group, or one of the branch windings of each phase winding further includes a conductor of the second conductor group, or one of the branch windings of each phase winding further includes a conductor of the third conductor group, or one of the branch windings of each phase winding further includes a conductor of the fourth conductor group.

5. The motor stator according to claim 4, characterized in that, The slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding is located in two adjacent slots of the stator core in the circumferential direction with the two slots of one conductor of the second conductor group; and / or, the slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding is located in two adjacent slots of the stator core with the two slots of one conductor of the third conductor group.

6. The motor stator according to claim 4, characterized in that, The slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding is located in two adjacent slots of the stator core in the circumferential direction with the two slots of a conductor of the first conductor group; and / or, the slot corresponding to the welded end of the lead wire connection of at least one branch winding in each phase winding is located in two adjacent slots of the stator core with the two slots of a conductor of the fourth conductor group.

7. The motor stator according to any one of claims 5 to 6, characterized in that, The first conductor group includes two first conductors, and the pitch between the two slots of each first conductor is a whole pitch; the fourth conductor group includes a fourth large conductor and a fourth small conductor, and the pitch between the two slots of the fourth large conductor is a long pitch, and the pitch between the two slots of the fourth small conductor is a short pitch.

8. The motor stator according to claim 7, characterized in that, The second conductor group includes: a fifth large conductor and a fifth small conductor, or the second conductor group includes: two identical second conductors; the two slots of each conductor in the second conductor group are located in the Nth and N+1th radially adjacent layers of the stator core, respectively, where N is an odd number; The third conductor group includes two conductors, and the two slots of each conductor in the third conductor group are located in the N+1th and N+2th radially adjacent layers of the stator core, respectively.

9. The motor stator according to claim 8, characterized in that, The pitch between the two slots of the fifth large conductor in the second conductor group is a long pitch, and the pitch between the two slots of the fifth small conductor in the second conductor group is a short pitch; the two conductors of the third conductor group are the same third conductor, and the pitch between the two slots of the third conductor is a whole pitch, and / or the two conductors of the third conductor group are a sixth large conductor and a sixth small conductor, and the pitch between the two slots of the sixth large conductor is a long pitch, and the pitch between the two slots of the sixth small conductor is a short pitch.

10. The motor stator according to claim 8, characterized in that, The pitch between the two slots of the second conductor in the second conductor group is a whole pitch; the two conductors in the third conductor group are the same third conductor, and the pitch between the two slots of the third conductor is a whole pitch, and / or, the two conductors in the third conductor group are a sixth large conductor and a sixth small conductor, and the pitch between the two slots of the sixth large conductor is a long pitch, and the pitch between the two slots of the sixth small conductor is a short pitch.

11. The motor stator according to any one of claims 9 to 10, characterized in that, The phase winding has multiple first connection welding ends and multiple second connection welding ends connected together. The welding ends of the M-1th layer that are radially adjacent to the second end of the stator core are the first connection welding ends, and the welding ends of the Mth layer that are radially adjacent to the second end of the stator core are the second connection welding ends. The sum of the span of the first connection welding ends and the span of the second connection welding ends is 6, and M is an even number.

12. An electric motor, characterized in that, Includes the motor stator as described in any one of claims 1 to 11.

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