A motor stator and a motor

Abstract

The application provides a motor stator and motor, comprising: a stator core, the stator core has a plurality of core slots, the plurality of core slots are formed on the radial inner surface of the stator core and are spaced apart along the circumferential direction of the stator core at a predetermined slot pitch; a stator winding, comprising a plurality of phase windings mounted on the stator core, and each slot is divided into M layers inside the number of slots that can be accommodated radially by the stator core, M is an even number greater than or equal to 4; the number of slots per phase per pole K of the stator winding is greater than or equal to 2, and each phase winding comprises K parallel branches. The parallel connection of the plurality of conductor groups is adopted, the bus bar and the bus bar are cancelled, the heat dissipation is uniform, the power and the torque are improved, the wiring mode is simplified, and then the complexity of the manufacturing process is reduced, the production cost is reduced, and the processing efficiency is improved.

Description

Technical Field

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

[0002] The stator winding consists of multiple U-shaped conductors. These U-shaped conductors are arranged in a certain way and inserted into the slots of the stator core to form the three-phase winding of the motor. In the existing technology, a large number of busbars and busbars are needed to connect each phase winding. The arrangement of the stator winding is complicated, difficult to form, has high production cost, and low processing efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide a motor stator and motor that eliminates the need for busbars and busbars, resulting in more uniform heat dissipation, increased power and torque, simplified wiring, and consequently reduced manufacturing complexity, lower production costs, and improved processing efficiency.

[0004] To achieve the above objectives, according to one aspect of the present invention, a motor stator is provided, comprising:

[0005] The stator core has a plurality of core 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.

[0006] The stator winding includes multiple phase windings mounted on the stator core, and each slot is divided into M layers by the number of slots that can be accommodated radially in the stator core, where M is an even number greater than or equal to 4.

[0007] The number of slots K per pole per phase of the stator winding is greater than or equal to 2. Each phase winding includes K parallel branches. The stator winding is arranged in the following order along the radial direction of the stator core: multiple inner conductor groups, multiple intermediate conductor groups, and multiple outer conductor groups. Each conductor group includes K conductors. The multiple inner conductor groups are located in the Mth layer of the stator core radial direction, and the multiple outer conductor groups are located in the first layer of the stator core radial direction.

[0008] The pitch of the K conductors in the inner conductor group is a whole pitch; the pitch of the K conductors in the outer conductor group is different from the pitch of the K conductors in the inner conductor group; the pitch of the K conductors in the middle conductor group is different from the pitch of the K conductors in the inner conductor group; or some of the K conductors in the middle conductor group are different from the pitch of the K conductors in the inner conductor group.

[0009] Each phase winding of the stator winding has multiple connection parts, each connection part is formed by the connection of the welded ends of the M-1 layer and the welded ends of the M layer located radially adjacent to each other in the stator core. The pitch of the multiple connection parts of each phase winding of the stator winding is different from the pitch of the K conductors of the inner conductor group.

[0010] Furthermore, the pitch of the K conductors in the intermediate conductor group of the stator winding is different from the pitch of the multiple connecting parts of the stator winding.

[0011] Furthermore, the intermediate conductor group of the stator winding includes K identical long-pitch conductors, and the pitch of the multiple connections of the stator winding is short-pitch.

[0012] Furthermore, the intermediate conductor group of the stator winding includes K identical short-pitch conductors, and the pitch of the multiple connections of the stator winding is long-pitch.

[0013] Furthermore, the K conductors of the intermediate conductor group of the stator winding are long-pitch conductor three and full-pitch conductor four, and the pitch of the multiple connection parts of the stator winding is short-pitch.

[0014] Furthermore, the K conductors of the intermediate conductor group of the stator winding are full-pitch conductor five and short-pitch conductor six, and the pitch of the multiple connection parts of the stator winding is long-pitch.

[0015] Furthermore, the inner conductor group comprises K identical conductors nine, and the outer conductor group comprises K conductors, namely a long-pitch conductor seven and a short-pitch conductor eight.

[0016] Furthermore, multiple intermediate conductor groups are located in the remaining layers except for the first radial layer and the Mth radial layer of the stator core.

[0017] According to another aspect of the present invention, an electric motor is provided, comprising the above-described motor stator.

[0018] According to the technical solution of this invention, a motor stator includes: a stator core having multiple core 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 multiple phase windings mounted on the stator core, each slot being divided into M layers based on the number of slots that can be accommodated radially within the stator core, where M is an even number greater than or equal to 4; the number of slots K per pole per phase of the stator winding is greater than or equal to 2, each phase winding including K parallel branches; and the stator winding being sequentially fitted with: multiple inner conductor groups, multiple intermediate conductor groups, and multiple outer conductor groups along the radial direction of the stator core, each conductor group including K conductors. Located in the Mth radial layer of the stator core, multiple outer conductor groups are located in the first radial layer of the stator core. The pitch of the K conductors in the inner conductor group is a whole pitch. The pitch of the K conductors in the outer conductor group is different from the pitch of the K conductors in the inner conductor group. The pitch of the K conductors in the middle conductor group is different from the pitch of the K conductors in the inner conductor group, or some conductors in the middle conductor group are different from the pitch of the K conductors in the inner conductor group. Each phase winding of the stator winding has multiple connection parts. Each connection part is formed by connecting the welded ends of the M-1th radially adjacent layers of the stator core and the welded ends of the Mth layer. The pitch of the multiple connection parts of each phase winding of the stator winding is different from the pitch of the K conductors in the inner conductor group. This application adopts the above technical solution, eliminating busbars and busbars, resulting in more uniform heat dissipation, increased power and torque, simplified wiring, and thus reducing the complexity of the manufacturing process, lowering production costs, and improving processing efficiency. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the motor stator structure in Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the stator winding structure in Embodiment 1 of the present invention;

[0022] Figure 3 This is a schematic diagram of the conductor structure of the inner conductor group in Embodiment 1 of this invention;

[0023] Figure 4 This is a schematic diagram of the outer conductor group in Embodiment 1 of the present invention;

[0024] Figure 5 This is a schematic diagram of the conductor structure of the intermediate conductor group in Embodiment 1 of the present invention;

[0025] Figure 6This is a schematic diagram of the intermediate conductor group structure in Embodiment 3 of the present invention;

[0026] Figure 7 This is a planar unfolded schematic diagram of the phase winding in Embodiment 1 of the present invention;

[0027] Figure 8 This is a planar unfolded schematic diagram of the phase winding in Embodiment 2 of the present invention;

[0028] Figure 9 This is a planar unfolded schematic diagram of the phase winding in Embodiment 3 of the present invention;

[0029] Figure 10 This is a planar unfolded schematic diagram of the phase winding in Embodiment 4 of the present invention;

[0030] Figure 11 This is a schematic diagram of a parallel connection principle of two branches in an embodiment of the present invention;

[0031] Figure 12 This is another schematic diagram of the parallel connection principle of two branches in an embodiment of the present invention; Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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 layer of the stator core can be either the first layer in the axial direction away from the center of the stator core or the first layer in the axial direction close to the center of the stator core.

[0035] 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 core 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;

[0036] like Figures 1 to 2 , Figures 7 to 10 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) form 4 layers in 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. The motor stator of this embodiment is the motor stator of a hairpin motor.

[0037] Combination Figures 7 to 10 In embodiments one to four, the stator winding 10 is mounted on the stator core 20, i.e., multiple phase windings are mounted on the stator core 20 so that they 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.

[0038] In this embodiment, each phase winding (U-phase winding, V-phase winding, W-phase winding) includes two parallel branches (K is 2 in this embodiment). The stator winding is arranged in the following order along the radial direction of the stator core: multiple inner conductor groups 100, multiple intermediate conductor groups, and multiple outer conductor groups. Each conductor group (inner conductor group 100, intermediate conductor group, and outer conductor group) includes two conductors. The fourth layer in the radial direction of the stator core includes 12 inner conductor groups, which are located in the 48 slots of the fourth layer in the radial direction of the stator core. The first layer in the radial direction of the stator core includes 12 outer conductor groups, which are located in the 48 slots of the first layer in the radial direction of the stator core.

[0039] like Figure 3 , Figures 7 to 10As shown, in Embodiments 1 to 4, the inner conductor group includes: two identical conductors 9 150 (K is 2 in this embodiment), each conductor 9 150 includes two slot interiors 301 located inside different core slots in the same radial layer of the stator core, a wire insertion end 302 located outside the core slot 21, the wire insertion end 302 located at the two slot interiors 301 connected to the conductor at the axial outer end 25 of the core slot 21, and two welding ends 303 (both pointing to the left) located outside the core slot and extending in the same direction. Two welding ends 303 are located on the outer side 26 of the core slot 21 and are respectively connected to the two slots 301 of the conductor in the same layer. The two slots of conductor nine in the inner conductor group are located in the fourth layer of the stator core in the radial direction. The two slots of one conductor nine in the inner conductor group are located in the first and seventh core slots of the fourth layer of the stator core in the radial direction. The two slots of the other conductor nine in the inner conductor group are located in the second and eighth core slots of the first layer of the stator core in the radial direction. That is, the pitch of conductor nine is a whole pitch.

[0040] like Figure 4 , Figures 7 to 10 As shown, in Embodiments 1 to 4, the two conductors of the outer conductor group 100 are: conductor seven 100A and conductor eight 100B. Each conductor in the outer conductor group includes two slot interiors 301 located inside different core slots in the same layer of the stator core radially, a wire insertion end 302 located outside the core slot 21, the wire insertion end 302 located 25 axially outside the core slot 21 connecting the two slot interiors 301 of the conductor, and two welding ends 303 located outside the core slot and extending in the same direction (both to the right). The two welding ends 303 are located axially outside the core slot 21. The two slots 301 of the conductor are connected to the two ends of the 26th section in the same layer. The two slots of each conductor in the outer conductor group are located in the first layer of the stator core in the radial direction. One conductor 100A of the outer conductor group is located in the second and ninth core slots of the first layer of the stator core in the radial direction. The conductor 100B of the outer conductor group is located in the third and eighth core slots of the first layer of the stator core in the radial direction. The pitch of conductor 7 of the outer conductor group is 7, and the pitch of conductor 8 of the outer conductor group is 5. That is, the pitch of conductor 7 and conductor 8 of the outer conductor group is different from the pitch of conductor 9 of the inner conductor group.

[0041] like Figure 5 , Figure 8As shown, in Embodiment 2, the second and third radial layers of the stator core include 24 intermediate conductor groups. These 24 intermediate conductor groups are sequentially located in 48 slots within the second and third radial layers of the stator core. Each intermediate conductor group includes: two identical long-pitch conductors 250, each long-pitch conductor 250 comprising two slot interiors 301 located within two adjacent radial layers of different core slots in the stator core; a wire insertion end 302 located outside the core slot 21; the wire insertion end 302 is located at the two slot interiors 301 connecting the conductor at the axial outer end 25 of the core slot 21; and two welding ends 303 located outside the core slot and extending in opposite directions (the two welding ends extend in opposite directions). The two welding ends 303 are located at... The two slots 301 of the conductor are connected in the same layer to the outer 26 end of the iron core slot 21. The two slots of each conductor in the intermediate conductor group are located in the second and third radial layers of the stator iron core. One long-pitch conductor 250 of one of the 24 intermediate conductor groups is located in the first and eighth iron core slots of the second and third radial layers of the stator iron core. The other long-pitch conductor 250 of the intermediate conductor group is located in the second and ninth iron core slots of the second and third radial layers of the stator iron core. The pitch of the conductor 250 of the intermediate conductor group is a long pitch. In this embodiment, the long pitch is 7, that is, the pitch 7 of the two conductors 250 of the intermediate conductor group is different from the pitch 6 of the two conductors 9 of the inner conductor group.

[0042] like Figure 5 , Figure 7 As shown, in Embodiment 1, the second and third radial layers of the stator core include 24 intermediate conductor groups. These 24 intermediate conductor groups are sequentially located in the 48 core slots of the second and third radial layers of the stator core. Each intermediate conductor group includes: two identical short-pitch conductors 250, each including two slot interiors 301 located inside two adjacent core slots in the radial direction of the stator core; a wire insertion end 302 located outside the core slot 21; the wire insertion end 302 is located at the two slot interiors 301 connecting the conductor at the axial outer end 25 of the core slot 21; and two welding ends 303 located outside the core slot and extending in opposite directions (the two welding ends extend in opposite directions). The two slots 301 of the conductor are connected in the same layer to the outer end 26 of the core slot 21. The two slots of each conductor in the intermediate conductor group are located in the second and third layers of the stator core radially. One short-pitch conductor 250 of the intermediate conductor group is located in the second and seventh core slots of the second and third layers of the stator core radially. The other short-pitch conductor 250 of the intermediate conductor group is located in the third and eighth core slots of the second and third layers of the stator core radially. The pitch of the conductor 2 of the intermediate conductor group is a short pitch. In this embodiment, the short pitch is 5, that is, the pitch 5 of the two short-pitch conductors 250 of the intermediate conductor group is different from the pitch 6 of the two conductors 9 of the inner conductor group.

[0043] like Figure 6 , Figure 9 As shown in Embodiment 3, the second and third radial layers of the stator core include 24 intermediate conductor groups 200. These 24 intermediate conductor groups 200 are sequentially located in the 48 core slots of the second and third radial layers of the stator core. Each intermediate conductor group 200 has two conductors: conductor five 200A and conductor six 200B. Each conductor in the intermediate conductor group includes two slot interiors 301 located inside different core slots in two adjacent radial layers of the stator core, a wire insertion end 302 located outside the core slot 21, the wire insertion end 302 connecting the two slot interiors 301 at the axial outer end 25 of the core slot 21, and two welding ends 303 located outside the core slot and extending in opposite directions (the two welding ends extend in opposite directions). The two welding ends 303 are respectively connected in the same layer at the axial outer end 26 of the core slot 21. The two slots 301 of the conductor are located inside the two slots of each conductor in the intermediate conductor group, which are located in the second and third radial layers of the stator core; one conductor 5 200A of the intermediate conductor group is located in the second and eighth core slots of the second and third radial layers of the stator core, and the other conductor 6 200B of the intermediate conductor group is located in the third and seventh core slots of the second and third radial layers of the stator core. That is, the pitch of conductor 5 of the intermediate conductor group is a whole pitch, which is 6 in this embodiment. The pitch of conductor 6 of the intermediate conductor group is a short pitch, which is 4 in this embodiment. That is, the pitch 4 of conductor 6 200A of the two conductors in the intermediate conductor group is different from the pitch 6 of conductor 9 of the inner conductor group. The pitch of some conductors in the intermediate conductor group is different from the pitch of the two conductors 9 of the inner conductor group.

[0044] like Figure 6 , Figure 10As shown, in Embodiment 4, the second and third radial layers of the stator core include 24 intermediate conductor groups. These 24 intermediate conductor groups are sequentially located in the 48 slots of the second and third radial layers of the stator core. Each intermediate conductor group has two conductors: conductor 3 (200A) and conductor 4 (200B). Each conductor in the intermediate conductor group includes two slot interiors 301 located inside different core slots in two adjacent radial layers of the stator core; a wire insertion end 302 located outside the core slot 21; the wire insertion end 302 is located at the axial outer end 25 of the core slot 21 and connects to the two slot interiors 301 of the conductor; and two welding ends 303 located outside the core slot and extending in opposite directions (the two welding ends extend in opposite directions). The two welding ends 303 are located at the axial outer end 26 of the core slot 21 and respectively connect to the two conductors in the same layer. Inside slot 301, the two slots of each conductor in the intermediate conductor group are located in the second and third radial layers of the stator core; one conductor 3 200A of one of the 24 intermediate conductor groups is located in the first and ninth core slots of the second and third radial layers of the stator core, and the other conductor 4 200B of the intermediate conductor group is located in the second and eighth core slots of the second and third radial layers of the stator core. That is, the pitch of conductor 3 in the intermediate conductor group is a long pitch, which is 8 in this embodiment, and the pitch of conductor 4 in the intermediate conductor group is a whole pitch, which is 6 in this embodiment. That is, the pitch 8 of conductor 3 200B in the two conductors of the intermediate conductor group is different from the pitch 6 of conductor 9 in the inner conductor group, and some conductors in the intermediate conductor group are different from the pitches of the two conductors 9 in the inner conductor group.

[0045] Combination Figure 8In Embodiment 2, each phase winding of the stator winding has 30 connection parts. 14 connection parts are formed by connecting the welded ends of the first and second layers located radially adjacent to each other in the stator core. 16 welded ends are formed by connecting the welded ends of the third and fourth layers located radially adjacent to each other in the stator core. In this embodiment, M is 2 and 4. Specifically, the first connection part is formed by connecting the welded end of a conductor 150 of an inner conductor group located inside the slot of the second core in the fourth layer to the welded end of a conductor 250 of another intermediate conductor group located inside the slot of the seventh core in the third layer, in the fourth and third layers of the stator core in the same radial direction. The pitch between the two slots corresponding to the two welded ends connected by this first connection part is a short pitch of 5. The second connection is formed by connecting the welded end of a conductor 250 of an intermediate conductor group located inside the second core slot of the second layer to the welded end of a conductor 100B of another outer conductor group located inside the seventh core slot of the first layer in the same radial direction of the stator core, in the second layer and the first layer. The pitch between the two slots corresponding to the two welded ends of the second connection is a short pitch 5. Correspondingly, the connection method of the remaining 28 connections is similar to that of the first and second connections, with each connection having a short pitch 5. The only difference is that the slots of the conductors are located in different layers of slots, which will not be elaborated further here. That is, in Embodiment 2, the pitch 5 of the 30 connections of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. The technical solution of the motor stator in the application embodiment eliminates the busbars and busbars, resulting in uniform heat dissipation, improved power and torque, simplified wiring, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0046] Combination Figure 7In Embodiment 1, each phase winding of the stator winding has 30 connection parts. 14 connection parts are formed by connecting the welded ends of the first and second layers located radially adjacent to each other in the stator core. 16 welded ends are formed by connecting the welded ends of the third and fourth layers located radially adjacent to each other in the stator core. In this embodiment, M is 2 and 4. Specifically, the first connection part is formed by connecting the welded end of a conductor 150 of an inner conductor group located inside the slot of the first core in the fourth layer to the welded end of a conductor 250 of another intermediate conductor group located inside the slot of the eighth core in the third layer, in the fourth and third layers of the stator core in the same radial direction. The pitch between the two slots corresponding to the two welded ends connected by this first connection part is a long pitch of 7. The second connection is formed by connecting the welded end of conductor 250 of an intermediate conductor group located inside the first core slot of the second layer to the welded end of conductor 100B of another outer conductor group located inside the eighth core slot of the first layer in the same radial direction of the stator core, in the second layer and the first layer. The pitch between the two slots corresponding to the two welded ends of the second connection is a long pitch 7. Correspondingly, the connection method of the remaining 28 connections is similar to that of the first and second connections, and the pitch of each connection is a long pitch 7. The only difference is that the slots of the conductors are located in different layers of slots, which will not be elaborated further here. That is, in embodiment one, the pitch 7 of the 30 connections of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. The technical solution of the motor stator in the application embodiment eliminates the busbar and busbar, resulting in uniform heat dissipation, improved power and torque, simplified wiring method, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0047] Combination Figure 10In Embodiment 4, each phase winding of the stator winding has 30 connection parts. 14 connection parts are formed by connecting the welded ends of the first and second layers located radially adjacent to each other in the stator core. 16 welded ends are formed by connecting the welded ends of the third and fourth layers located radially adjacent to each other in the stator core. In this embodiment, M is 2 and 4. Specifically, the first connection part is formed by connecting the welded end of a conductor 150 of an inner conductor group located inside the slot of the second core in the fourth layer to the welded end of a conductor 200B of another intermediate conductor group located inside the slot of the seventh core in the third layer, in the fourth and third layers of the stator core in the same radial direction. The pitch between the two slots corresponding to the two welded ends connected by this first connection part is a short pitch of 5. The second connection is formed by connecting the welded end of conductor 200B of an intermediate conductor group located inside the second core slot of the second layer to the welded end of conductor 100B of an outer conductor group located inside the seventh core slot of the first layer in the same radial direction of the stator core, in the second layer and the first layer. The pitch between the two slots corresponding to the two welded ends of the second connection is a short pitch 5. Correspondingly, the connection method of the remaining 28 connections is similar to that of the first and second connections, with each connection having a short pitch 5. The only difference is that the conductor slots are located in different layers of slots, which will not be elaborated further here. That is, in embodiment four, the pitch 5 of the 30 connections of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. The technical solution of the motor stator in the application embodiment eliminates the busbars and busbars, resulting in uniform heat dissipation, improved power and torque, simplified wiring, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0048] Combination Figure 9In Embodiment 3, each phase winding of the stator winding has 30 connection parts. 14 connection parts are formed by connecting the welded ends of the first and second layers located radially adjacent to each other in the stator core. 16 welded ends are formed by connecting the welded ends of the third and fourth layers located radially adjacent to each other in the stator core. In this embodiment, M is 2 and 4. Specifically, the first connection part is formed by connecting the welded end of a conductor 150 of an inner conductor group located inside the slot of the first core in the fourth layer to the welded end of a conductor 200A of another intermediate conductor group located inside the slot of the eighth core in the third layer, in the fourth and third layers of the stator core in the same radial direction. The pitch between the two slots corresponding to the two welded ends connected by this first connection part is a long pitch of 7. The second connection is formed by connecting the welded end of conductor 6200B of an intermediate conductor group located inside the first core slot of the second layer to the welded end of conductor 8100B of an outer conductor group located inside the eighth core slot of the first layer in the same radial direction of the stator core, in the second layer and the first layer. The pitch between the two slots corresponding to the two welded ends of the second connection is a long pitch 7. Correspondingly, the connection method of the remaining 28 connections is similar to that of the first and second connections, and the pitch of each connection is a long pitch 7. The only difference is that the slots of the conductors are located in different layers of slots, which will not be elaborated further here. That is, in embodiment three, the pitch 7 of the 30 connections of each phase winding is different from the pitch 6 of the conductors of the inner conductor group. The technical solution of the motor stator in the application embodiment eliminates the busbar and busbar, resulting in uniform heat dissipation, improved power and torque, simplified wiring method, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0049] In Embodiment 1, the pitch of the two identical conductors in the middle conductor group of the stator winding is a long pitch (7 in Embodiment 1), and the pitch of the 30 connecting parts of the stator winding is a short pitch (5 in Embodiment 1).

[0050] In Embodiment 2, the pitch of the two identical conductors in the middle conductor group of the stator winding is a short pitch (5 in Embodiment 2), and the pitch of the 30 connecting parts of the stator winding is a long pitch (7 in Embodiment 2).

[0051] In Embodiment 3, the pitch of conductor 3 of the intermediate conductor group of the stator winding is a long pitch of 8 (in Embodiment 3, the long pitch is 8), the pitch of conductor 4 is a whole pitch (in Embodiment 3, the whole pitch is 6), and the pitch of the 30 connecting parts of the stator winding is a short pitch (in Embodiment 3, the short pitch is 5).

[0052] In Embodiment 4, the pitch of conductor five in the middle conductor group of the stator winding is a full pitch (6 in Embodiment 4), the pitch of conductor six is ​​a short pitch (4 in Embodiment 4), and the pitch of the 30 connecting parts of the stator winding is a long pitch (7 in Embodiment 4).

[0053] In Embodiments 1 to 4, the pitch of the two identical conductors 9 in the inner conductor group of the stator winding is a whole pitch (6 in the embodiment), the pitch of one conductor 7 in the outer conductor group is a long pitch (7 in the embodiment), and the pitch of the other conductor 8 in the outer conductor group is a short pitch (5 in the embodiment).

[0054] In the above embodiments one to four, the intermediate conductor group is located in the remaining layers except for the first and Mth radial layers of the stator core. When M is 4, the intermediate conductor group is located in the second and third radial layers of the stator core. When M is 6, the intermediate conductor group is located in the second, third, fourth, and fifth radial layers of the stator core.

[0055] This embodiment also provides a motor, including the motor stator described above, and a motor using the motor stator described above.

[0056] 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.

[0057] 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.

[0058] 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 core 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 multiple phase windings mounted on the stator core, and each slot is divided into M layers by the number of slots that can be accommodated radially in the stator core, where M is an even number greater than or equal to 4; The stator winding is characterized in that: the number of slots K per pole per phase of the stator winding is greater than or equal to 2, each phase winding includes K parallel branches, and the stator winding is arranged in sequence along the radial direction of the stator core as follows: multiple inner conductor groups, multiple intermediate conductor groups, and multiple outer conductor groups, each conductor group includes K conductors, the multiple inner conductor groups are located in the Mth layer of the stator core radial direction, and the multiple outer conductor groups are located in the first layer of the stator core radial direction; The pitch of the K conductors in the inner conductor group is a whole pitch. The pitch of the K conductors in the outer conductor group is different from the pitch of the K conductors in the inner conductor group. The pitch of the K conductors in the middle conductor group is different from the pitch of the K conductors in the inner conductor group. Or, some of the K conductors in the middle conductor group are different from the pitch of the K conductors in the inner conductor group. Each phase winding of the stator winding has multiple connection parts, each connection part is formed by connecting the welded ends of the M-1 layer and the welded ends of the M layer located radially adjacent to each other in the stator core. The pitch of the multiple connection parts of each phase winding of the stator winding is different from the pitch of the K conductors of the inner conductor group.

2. The motor stator according to claim 1, characterized in that, The pitch of the K conductors of the intermediate conductor group of the stator winding is different from the pitch of the plurality of the connecting parts of the stator winding.

3. The motor stator according to claim 2, characterized in that, The intermediate conductor group of the stator winding includes K identical long-pitch conductors, and the pitch of the plurality of the connecting parts of the stator winding is short-pitch.

4. The motor stator according to claim 2, characterized in that, The intermediate conductor group of the stator winding includes K identical short-pitch conductors, and the pitch of the plurality of connection portions of the stator winding is long-pitch.

5. The motor stator according to claim 2, characterized in that, The K conductors of the intermediate conductor group of the stator winding are long-pitch conductor three and full-pitch conductor four, and the pitch of the multiple connecting parts of the stator winding is short-pitch.

6. The motor stator according to claim 2, characterized in that, The K conductors of the intermediate conductor group of the stator winding are a full-pitch conductor five and a short-pitch conductor six, and the pitch of the multiple connecting parts of the stator winding is a long pitch.

7. The motor stator according to claim 1, characterized in that, The inner conductor group includes K identical conductors nine, and the outer conductor group consists of K conductors, namely a long-pitch conductor seven and a short-pitch conductor eight.

8. The motor stator according to any one of claims 1 to 7, characterized in that, The plurality of intermediate conductor groups are located in the remaining layers except for the first radial layer and the Mth radial layer of the stator core.

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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