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 includes multiple phase windings mounted on the stator core so that they are different from each other in electrical phase. Each phase winding includes multiple second conductor groups, multiple third conductor groups, and one fourth conductor group connected in series in sequence; or each phase winding includes multiple second conductor groups, multiple third conductor groups, and one first conductor group connected in series in sequence; or each phase winding includes one first conductor group, multiple second conductor groups, multiple third conductor groups, and one fourth conductor group connected in series in sequence in sequence. By using multiple conductor groups and conductors connected in series, the arrangement is simple, and the twisting direction and twisting slot pitch of the welded ends extending inside the slots in the same radial layer of the stator slots are consistent. This allows the lead ends and neutral points of each phase winding to be set in any slot and any layer in the same radial direction, reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

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 Art

[0002] In existing technologies, stator windings include various types of conductors, which are arranged in a specific pattern and inserted into the slots of the stator core to form the required multiphase motor windings. Currently, over 90% of stator windings have at least two slots per pole per phase. However, in structures where stator windings are connected in series between phases, inconsistencies may occur in the twisting direction of the welded ends within the same slot layer or in the spacing between the twisted slots. This leads to complex manufacturing processes, difficult forming, high production costs, and low processing efficiency. Summary of the Invention

[0003] This invention provides a motor stator and a motor, which employs multiple conductor groups and conductors connected in series, resulting in a simple arrangement. This ensures that the twisting direction and twisting slot spacing of the welded ends extending within the same radial layer of the stator slot are consistent, allowing the lead ends and neutral points of each phase winding to be located in any slot and layer of the same radial direction. This reduces the complexity of the manufacturing process, lowers production costs, and improves processing efficiency.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] 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;

[0006] Stator windings include multiple phase windings mounted on the stator core so that they are different from each other in electrical phase;

[0007] Each phase winding includes a plurality of second conductor groups, a plurality of third conductor groups and a fourth conductor group connected in series, or each phase winding includes a first conductor group, a plurality of second conductor groups and a plurality of third conductor groups connected in series, or 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 connected in series.

[0008] Each slot is divided into M radially distributed layers based on the number of slots that can be accommodated along the radial direction of the stator core, where M is an even number greater than or equal to 4.

[0009] The first conductor group of each phase winding is located in the Mth layer of the stator core in the radial direction, and / or the fourth conductor group of the phase winding is located in the first layer of the stator core in the radial direction;

[0010] Each conductor group includes multiple conductors. Each conductor group includes two welded ends located inside two slots of the stator core at a specified slot spacing, respectively located inside the two slots connecting the conductor to the second axial end of the stator core, and two plug-in ends located inside the two slots connecting the conductor to the first axial end of the stator core.

[0011] Each phase winding also includes two eighth conductors, each including a slot interior and two welded ends located at the axial ends of the stator core and connected to the slot interior; the lead of each phase winding is located at the welded end of the eighth conductor at the first axial end of the stator core.

[0012] Each phase winding also includes one conductor from any conductor group, and the slots corresponding to the two welded ends of the two eighth conductors connected by the lead wires are located in two adjacent slots in the stator core circumferentially adjacent to the slots of one conductor from any conductor group of the phase winding.

[0013] Furthermore, the welded ends of the lead wires of each phase winding are located in two adjacent layers in the radial direction of the stator core. The welded ends of the lead wires of the phase winding are located in the Nth and N+1th layers in the radial direction of the stator core, or the welded ends of the lead wires of the phase winding are located in the N+1th and N+2th layers in the radial direction of the stator core, where N is an odd number.

[0014] Furthermore, the welded ends of the lead wires of each phase winding are located in the same radial layer of the stator core, and the welded ends of the lead wires of that phase winding are located in the Mth or first radial layer of the stator core.

[0015] Furthermore, the slot corresponding to the welded end of the lead wire connection of each 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; or, the slot corresponding to the welded end of the lead wire connection of each phase 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.

[0016] Furthermore, the slot corresponding to the welded end of the lead wire connection of 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; or, the slot corresponding to the welded end of the lead wire connection of 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.

[0017] Furthermore, the phase winding located at the second axial end of the stator core 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 at the second axial end of the stator core are the first connection welding ends, and the welding ends of the Mth layer that are radially adjacent at the second axial end of the stator core are the second connection welding ends, where M is an even number.

[0018] Furthermore, the first conductor group includes identical 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, 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.

[0019] Furthermore, each conductor in the second conductor group is located within the Nth and N+1th radially adjacent layers of the stator core, respectively;

[0020] Each conductor in the third conductor group is located in the N+1th and N+2th radially adjacent layers of the stator core, where N is an odd number.

[0021] The present invention also provides an electric motor, including the above-described motor stator.

[0022] 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 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 includes a plurality of second conductor groups, a plurality of third conductor groups and a fourth conductor group connected in series in sequence, or each phase winding includes a first conductor group, a plurality of second conductor groups and a plurality of third conductor groups connected in series in sequence, or 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 connected in series in sequence; each slot is divided into M layers radially distributed according to 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 4, and the first conductor group of each phase winding is located on the stator core. The stator core is located in the first radial layer M of the stator core, and / or the fourth conductor group of the phase winding is located in the first radial layer of the stator core. Each conductor group includes multiple conductors, and each conductor group includes two slots located in the stator core with 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. Each phase winding also includes two eighth conductors, each eighth conductor including a slot and two welded ends located in the stator core at both axial ends connecting the slot. The lead wire of each phase winding is located at the welded end of the eighth conductor at the first axial end of the stator core. Each phase winding also includes one conductor from any conductor group, and the slots corresponding to the two welded ends of the two eighth conductors connected by the lead wire are located in two adjacent slots in the stator core circumferentially. By employing multiple conductor groups and conductor series connections, the arrangement is simple, ensuring that the twisting direction and twisting slot spacing of the welded ends extending radially within the same layer of the stator slot are consistent. This allows the lead ends and neutral points of each phase winding to be set in any slot and layer of the same radial direction, reducing the complexity of the manufacturing process, lowering production costs, and improving processing efficiency. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of the motor stator provided in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of a phase winding provided in Embodiment 1 of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the fourth conductor group provided in Embodiment 1 of the present invention;

[0027] 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;

[0028] Figure 5 This is a schematic diagram of the structure of the second or third conductor group provided in Embodiment 5 of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the second or third conductor group provided in Embodiment 1 of the present invention;

[0030] Figure 7 This is a schematic diagram of the planar distribution of a phase winding provided in Embodiment 1 of the present invention;

[0031] Figure 8 This is a schematic diagram of the planar distribution of a phase winding provided in Embodiment 2 of the present invention;

[0032] Figure 9 This is a schematic diagram of the planar distribution of a phase winding provided in Embodiment 3 of the present invention;

[0033] Figure 10 This is a schematic diagram of the planar distribution of a phase winding provided in Embodiment 4 of the present invention;

[0034] Figure 11 This is a schematic diagram of the three phase windings connected in a star configuration according to an embodiment of the present invention;

[0035] Figure 12 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

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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;

[0040] like Figures 1 to 2 , Figures 7 to 12 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 4 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 four, six, eight, or more. In this embodiment, the motor stator is the motor stator of a hairpin motor.

[0041] Combination Figures 1 to 12 In embodiments one to five, the stator winding 10 is mounted on the stator core 20, i.e., multiple phase windings mounted on the stator core 20 are different from each other in electrical phase. The stator winding 10 is a three-phase winding (i.e., U-phase winding, V-phase winding, W-phase winding), and there are at least 2 slots per pole per phase. Each magnetic pole of the rotor is provided with two slots 21. In this embodiment, there are 2 slots per pole per phase. The rotor has eight magnetic poles and this is true for each phase of the three-phase stator winding 10. The number of slots 21 provided in the stator core 20 is equal to 48 (i.e., 2 x 8 x 3). In addition, in this embodiment, the stator core 20 is defined by two adjacent slots 21 to form a tooth 22. The stator core 20 is formed by stacking multiple annular magnetic steel plates to form 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.

[0042] like Figure 7 As shown, in this embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) consists of one first conductor group, eleven second conductor groups, two third conductor groups, and one fourth conductor group connected in series. Figure 8As shown, in this second embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) consists of 12 second conductor groups, 2 third conductor groups, and 1 fourth conductor group connected in series; as shown... Figure 9 As shown, in this third embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) consists of one first conductor group, twelve second conductor groups, one third conductor group, and one fourth conductor group connected in series. Figure 10 As shown, in this embodiment four, each phase winding (U-phase winding, V-phase winding, W-phase winding) consists of one first conductor group, 12 second conductor groups, and two third conductor groups connected in series. It should be noted that in this application, the plurality of third conductor groups are integers greater than or equal to 1.

[0043] like Figure 3 , Figure 4 , Figures 7 to 10 As shown, in Embodiments 1 to 5, the first conductor group of each phase winding is located in the fourth radial layer of the stator core, and the fourth conductor group of the phase winding is located in the first radial layer of the stator core.

[0044] Combination Figures 3 to 10 In an 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 radially of the stator core and separated by a predetermined slot spacing, two welding ends 303 located at the second end 25 of the stator core axially 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 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 21 axially connecting the two slot interiors 301 of the conductor in the same layer, the two slot interiors of the first conductor being located in the fourth layer of the innermost radial layer of the stator core;

[0045] 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.

[0046] In embodiments one to four, 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 end 25 of the stator core axially connecting the conductor to the two slot interiors 301, and a plug end 302 located at the first end 26 of the stator core axially connecting the conductor to the two slot interiors 301; 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 end 25 of the slot axially connecting the two slot interiors 301 of the conductor in the same layer; the two slot interiors of each conductor in the second conductor group are located in the first and second layers, the third and fourth layers of the stator core radially adjacent.

[0047] In Embodiment 5, the second conductor group includes 300: a fifth large conductor and a fifth small conductor. Each conductor in the fifth large conductor and the fifth small conductor 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 end 25 of the stator core axial direction connecting the conductor to the two slot interiors 301, and a plug end 302 located at the first end 26 of the stator core axial direction 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), and the two welding ends 303 located at the outer end 25 of the slot axial direction of the slot 21 respectively connecting to the two slot interiors 301 of the conductor in the same layer; the two slot interiors of each conductor in the second conductor group are located in the first and second layers, the third layer and the fourth layer of the stator core radially adjacent.

[0048] In the embodiment, the conductors of the third conductor group have the same structure as those of the second conductor group, the only difference being that the two slots of each conductor in the third conductor group are located in the second and third layers of the stator core in a radially adjacent manner.

[0049] Each phase winding also includes two eighth conductors, each eighth conductor comprising a slot interior and two welded ends located at the first end 26 and the second end 25 of the stator core axial direction, connecting to the slot interior. The two welded ends located at the two ends of the stator core axial direction are located in the same layer radially on the stator core as the slot interior. The eighth conductor connected to the lead end of each phase winding is located at the welded end of the first end 26 of the stator core axial direction, and the other eighth conductor connected to the output end of the phase winding is located at the welded end of the first end 26 of the stator core axial direction. In embodiments one to four, the slot interior corresponding to the welded end connected to the lead end of each phase winding (the slot interior of the first eighth conductor) is located in slot A of the stator core (here, since the number of slots corresponding to the conductor slot interiors of different conductor groups in different embodiments can be any number of slots, slot A is used to replace any slot in the 48 slots) and any conductor group (the first conductor group or One conductor of the second, third, or fourth conductor group is located inside one slot of the stator core in slot A+1 or slot A-1, which is located in two adjacent slots circumferentially within the stator core. The slot corresponding to the welded end of each phase winding (the slot of the second eighth conductor) is located inside slot B of the stator core (since the number of slots corresponding to the conductor slots of different conductor groups in different embodiments can be any number of slots, slot B is used to replace any slot in the 48 slots). One conductor of any conductor group (first, second, third, or fourth conductor group) is located inside one slot of the B+1 or B-1 slot, which is located in two adjacent slots circumferentially within the stator core. That is, the slots corresponding to the two welded ends of the two eighth conductors connected by the lead wires and the two slots of one conductor of a conductor group are located in two adjacent slots circumferentially within the stator core. By employing multiple conductor groups and conductor series connections, the arrangement is simple, ensuring that the twisting direction and twisting slot spacing of the welded ends extending radially within the same layer of the stator slot are consistent. This allows the lead ends and neutral points of each phase winding to be set in any slot and layer of the same radial direction, reducing the complexity of the manufacturing process, lowering production costs, and improving processing efficiency.

[0050] Combination Figure 7 In Embodiment 1, the welded ends of the lead wires of each phase winding are located in two adjacent layers radially to the stator core and at the first circumferential end 26 of the stator core. The welded ends of the lead wires U1 of each phase winding are located in the fourth radial layer of the stator core, and the welded ends of the lead wires U2 of the phase winding are located in the third radial layer of the stator core. That is, the welded ends of the lead wires of each phase winding are located in two adjacent layers radially to the stator core and at the first axial end 26 of the stator core. The welded ends of the lead wires of each phase winding are located in the Nth and N+1th radial layers of the stator core, where N is an odd number.

[0051] Combination Figure 8As shown, in Embodiment 2, the welding end connected to the lead end U1 of each phase winding is located in the 4th radial layer of the stator core, and the welding end connected to the output end of the phase winding is located in the 4th radial layer of the stator core; that is, the welding end connected to the lead of each phase winding is located in the first axial end 26 of the stator core, and the welding ends connected to the lead of the phase winding are all located in the same radial layer of the stator core, that is, the welding end connected to the lead of each phase winding is located in the Mth radial layer of the stator core.

[0052] Combination Figure 9 In Embodiment 3, the welding end connected to the lead end U1 of each phase winding is located in the third radial layer of the stator core, and the welding end connected to the output end U2 of the phase winding is located in the second radial layer of the stator core; that is, the welding end connected to the lead of each phase winding is located at the first axial end 26 of the stator core, and the welding ends connected to the lead of the phase winding are all located in the N+1 and N+2 radial layers of the stator core.

[0053] Combination Figure 10 In Embodiment 4, the welding end connected to the lead end U1 of each phase winding is located in the first radial layer of the stator core, and the welding end connected to the output end of the phase winding is located in the first radial layer of the stator core; that is, the welding end connected to the lead of each phase winding is located in the first axial end 26 of the stator core, and the welding ends connected to the lead of the phase winding are all located in the same radial layer of the stator core, that is, the welding end connected to the lead of each phase winding is located in the first radial layer of the stator core.

[0054] Combination Figures 1 to 10 In Embodiment 1, each phase winding also includes one conductor of a second conductor group. The conductor of the second conductor group in each phase winding is the second conductor 350. In Embodiment 5, the conductor of the second conductor group in each phase winding is the sixth small conductor. Of course, in Embodiment 5, the conductor of the second conductor group in each phase winding can also be the sixth large conductor. The slots corresponding to the welding ends of at least one branch winding of each phase winding (the two slots of the two eighth conductors) and the two slots of one conductor of a second conductor group are located in two adjacent slots circumferentially within the stator core. Figure 7 In embodiment four, the slots corresponding to the welded ends of the first branch winding of this phase winding (the two slots of the two eighth conductors) are located in slot 13 of the third radial layer and slot 19 of the fourth layer of the stator core, and the two slots of slot 14 of the third radial layer and slot 20 of the fourth layer of the stator core are located in adjacent slots in the circumferential direction of the stator core; combined with Figure 9In Embodiment 3, each phase winding also includes a conductor from a third conductor group, and the conductor from the third conductor group in each phase winding is the third conductor 250. In Embodiment 5, each phase winding includes a conductor from the third conductor group as the fifth small conductor. Of course, in Embodiment 5, each phase winding includes a conductor from the third conductor group as the fifth large conductor. The slots corresponding to the welded ends of at least one branch winding of each phase winding (the two slots of the two eighth conductors) and the two slots of the conductor from the third conductor group are located in two adjacent slots in the circumferential direction of the stator core. Figure 8 In Embodiment 2, the slots corresponding to the welded ends of the second branch winding of this phase winding (the two slots of the two eighth conductors) are located in slot 13 of the third radial layer and slot 19 of the second radial layer of the stator core. The slots of one conductor from the third conductor group of this branch winding are located in slot 14 of the third radial layer and slot 20 of the second radial layer of the stator core. These two slots are located in two adjacent slots circumferentially within the stator core. (Combined with...) Figure 8 In Embodiment 2, each phase winding includes one conductor of the first conductor group, and each phase winding includes one conductor of the first conductor group as the first conductor 150. The slots corresponding to the welding ends of at least one branch winding of each phase winding (the two slots of the two eighth conductors) and the two slots of one conductor of the first conductor group are located in two adjacent slots in the circumferential direction of the stator core; combined with Figure 8 In Embodiment 2, the slots corresponding to the welded ends of the second branch winding of this phase winding (the two slots of the two eighth conductors) are located in slots 26 and 32 of the fourth radial layer of the stator core, and the slots 25 and 31 of the fourth radial layer of the stator core are located in adjacent slots in the circumferential direction of the stator core. Figure 10 In embodiment four, each phase winding includes one conductor of the fourth conductor group, and each phase winding includes one conductor of the fourth conductor group, which is the fourth small conductor 100B, or of course, the fourth large conductor 100A. The slots corresponding to the welding ends of at least one branch winding of each phase winding (the two slots of the two eighth conductors) and the two slots of one conductor of the fourth conductor group are located in two adjacent slots in the circumferential direction of the stator core; combined with Figure 9 In Embodiment 3, the slots corresponding to the welding ends of the second branch winding of the phase winding (the two slots of the two eighth conductors) are located in the 19th slot and the 26th slot of the first layer of the stator core in the radial direction. The slots of the second branch winding and the fourth conductor group of the branch winding are located in the 20th slot and the 25th slot of the first layer of the stator core in the radial direction. The two slots are located in the two adjacent slots in the circumferential direction of the stator core.

[0055] Furthermore, the first conductor group includes two first conductors. The two slots of the first first conductor 150 in the first conductor group are located in slots 7 and 13, and the two slots of the second first conductor 150 in the first conductor group are located in slots 8 and 14. That is, the pitch between the two slots of the two first conductors in the first conductor group is a whole pitch. The two slots of the two first conductors 150 in the first conductor group are respectively located in two adjacent slots in the fourth layer of the stator core. The two slots of the fourth large conductor 100A in the fourth conductor group are located in slots 13 and 20, and the two slots of the fourth small conductor 100B in the fourth conductor group are located in slots 14 and 19. 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 surround the two slots of the fourth small conductor 100B in the first layer of the stator core in the circumferential direction.

[0056] Combination Figure 7As shown, in Embodiment 1, each phase winding (U-phase winding, V-phase winding, or W-phase winding) includes two third conductor groups, i.e., it contains two identical third conductor groups. When the even-number of layers is 6, the U-phase winding includes four 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 at the second axial end of the stator core. The welding end located in the first radial layer of the stator core is the first connection welding end, and the welding end located in the second radial layer of the stator core is the second connection welding end. The welding end of the third radial layer of the stator core is the first connecting welding end, and the welding end of the fourth 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 fourth radial layer of the stator core is connected to the welding end of a second conductor 350 or a third conductor 250 located in the third radial layer of the stator core. The pitch of the second connecting weld ends is a whole pitch of 6. The pitch of the first connecting weld end of the other weld end of a second conductor 350 or a third conductor 250 located in the second layer of the same radial direction of the stator core, and the pitch of the second connecting weld end of a weld end of a second conductor 350 or a fourth large conductor 100A or a fourth small conductor 100B located in the adjacent first layer of the same radial direction of the stator core, is a whole pitch of 6. The two slots of the first second conductor 350 of the second conductor group are located in the first slot and the seventh slot of the stator core, respectively. The two slots of the second second conductor 350 of the second conductor group are located in the second slot and the eighth slot of the stator core, respectively. That is, the pitch between the two slots of the second conductor of the second conductor group is a whole pitch of 6. The two conductors of the third conductor group are the same third conductor 250. The two slots of the first third conductor 250 of the third conductor group are located in the core slots 19 and 25. The two slots of the second third conductor 250 of the third conductor group are located in the core slots 20 and 26, respectively. That is, the pitch between the two slots of the third conductor 250 of the third conductor group is a whole pitch.

[0057] For example, such as Figure 11 The image shows a star connection of the series windings of a motor, as shown. Figure 12 The figure shows the delta connection of the series windings of the motor.

[0058] This embodiment also provides a motor, including the motor stator described above, and a motor using the motor stator described above.

[0059] 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.

[0060] 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.

[0061] 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 includes a plurality of phase windings mounted on the stator core so that they are different from each other in electrical phase; Its features are: Each phase winding includes a plurality of second conductor groups, a plurality of third conductor groups and a fourth conductor group connected in series, or each phase winding includes a first conductor group, a plurality of second conductor groups and a plurality of third conductor groups connected in series, or 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 connected in series. 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 4. The first conductor group of each phase winding is located in the Mth radial layer of the stator core, and / or the fourth conductor group of the phase winding is located in the first radial layer of the stator core; 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, respectively located inside the two slots connecting the conductor to the second axial end of the stator core, and two plug-in ends located inside the two slots connecting the conductor to the first axial end of the stator core. Each phase winding also includes two eighth conductors, each eighth conductor comprising a slot interior and two welded ends located at both axial ends of the stator core and connected to the slot interior; the lead wire of each phase winding is located at the welded end of the stator core at the first axial end connected to the eighth conductor. Each phase winding also includes a conductor from any conductor group, wherein the slots corresponding to the two welded ends of the two eighth conductors connected by the lead wires are located in two adjacent slots in the circumferential direction of the stator core, and the slots of the conductor from any conductor group of the phase winding are located in the two slots adjacent to each other in the stator core.

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

3. The motor stator according to claim 1, characterized in that, The welded ends of the lead wires of each phase winding are located in the same radial layer of the stator core, and the welded ends of the lead wires of the phase winding are located in the Mth or first radial layer of the stator core.

4. The motor stator according to claim 2, characterized in that, The slot corresponding to the welded end of the lead wire connection of each phase winding and the two slots of one conductor of the second conductor group are located in two adjacent slots in the circumferential direction of the stator core; or, the slot corresponding to the welded end of the lead wire connection of each phase winding and the two slots of one conductor of the third conductor group are located in two adjacent slots in the circumferential direction of the stator core.

5. The motor stator according to claim 3, characterized in that, The slot corresponding to the welded end of the lead wire connection of each phase winding and the two slots of a conductor of the first conductor group are located in two adjacent slots in the circumferential direction of the stator core; or, the slot corresponding to the welded end of the lead wire connection of each 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.

6. The motor stator according to claim 1, characterized in that, The phase winding located at the second axial end of the stator core has multiple first connection welding ends and multiple second connection welding ends connected together. The welding ends of the M-1th layer that are adjacent in the same radial direction at the second axial end of the stator core are the first connection welding ends, and the welding ends of the Mth layer that are adjacent in the same radial direction at the second axial end of the stator core are the second connection welding ends, where M is an even number.

7. The motor stator according to claim 6, characterized in that, The first conductor group includes identical 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, 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, Each conductor of the second conductor group is located in the Nth and N+1th radially adjacent layers of the stator core, respectively; Each conductor in the third conductor group is located in the N+1th and N+2th radially adjacent layers of the stator core, where N is an odd number.

9. An electric motor, characterized in that, Includes the motor stator as described in any one of claims 1 to 8.

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