Motor stator and motor

Abstract

The present invention relates to the field of motors, and discloses a motor stator and a motor, wherein the motor stator comprises a stator core, on which a plurality of slots are arranged along the axial direction of the stator core, and the plurality of slots are distributed along the circumference of the stator core; and further comprises a stator winding, comprising an inner coil unit and an outer coil unit which are sequentially sleeved from the inside to the outside, each of the coil units comprising a plurality of conductors, each conductor comprising two slot interiors, a slot outer turning portion connected to the two slot interiors and forming a U-shaped structure with the two slot interiors, and slot outer ends respectively connected to the two slot interiors; each slot is divided into M layers according to the number of slot interiors that each slot can accommodate along the radial direction of the stator core, and M is an integer greater than or equal to 2; the two slot interiors of each conductor in the inner coil unit are located in the same layer, and each slot interior and the slot outer end adjacent thereto are located in the same layer. In the present invention, the two slot interiors of each conductor in the inner coil unit and the slot outer end adjacent to the corresponding slot interior are all located in the same layer, so that the rotor can be inserted from one end of the inner coil unit where the slot outer end is arranged, and the length of the stator core tooth portion will not be increased.

Description

Technical Field

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

[0002] The stator core of the existing hairpin motor is a hollow structure, and a plurality of teeth are arranged circumferentially inside the stator core. A slot is formed between two adjacent teeth, and a plurality of conductors are accommodated in each slot along the radial direction of the stator core. The slot outer turning part and slot outer end of the existing same-layer coil unit are both protruded toward the center of the stator core. In order to avoid the slot outer turning part and slot outer end on the inner side of the stator winding interfering with the rotor installation, the radial length of the tooth is usually increased to solve the above technical problem. However, the above method will have the following technical defects:

[0003] As the tooth length increases, the slot utilization rate decreases, the power density decreases, and the motor cost and volume increase. Summary of the invention

[0004] The object of the present invention is to provide a motor stator and a motor, which can reduce the size of the motor and reduce the cost of the motor while ensuring that the inner turning part of the stator winding does not affect the installation of the rotor.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A motor stator comprises a stator core, on which a plurality of slots are arranged axially through the stator core, and the plurality of slots are distributed circumferentially of the stator core; and further comprises:

[0007] The stator winding comprises an inner coil unit and an outer coil unit which are sequentially sleeved from the inside to the outside, each of the coil units comprises a plurality of conductors, each conductor comprises two slot interiors, a slot outer turning portion connected to the two slot interiors and forming a U-shaped structure with the two slot interiors, and slot outer end portions respectively connected to the two slot interiors;

[0008] Each slot is divided into M layers according to the number of slot interiors that each slot can accommodate along the radial direction of the stator core, where M is an integer greater than or equal to 2; the two slot interiors of each conductor in the inner coil unit are located in the same layer, and each slot interior and the slot outer end adjacent to it are located in the same layer.

[0009] Furthermore, it also includes an intermediate coil unit disposed between the inner coil unit and the outer coil unit, wherein the two slots of each conductor in the intermediate coil unit are located in two adjacent layers;

[0010] When M is an even number, the two slots of each conductor of the outer coil unit are located in two adjacent layers; when M is an odd number, the two slots of each conductor of the outer coil unit are located in the same layer.

[0011] Further, the outer turning portion of the groove includes a first extension portion, a turning portion, a second extension portion and a turning portion which are connected in sequence, and the first extension portion and the turning portion are respectively connected to the inside of the two grooves;

[0012] In each of the conductors of the inner coil unit, the first extension portion and the interior of the slot adjacent to it are located on the same layer, the second extension portion is located on the side of the layer where the first extension portion is located that is close to the central axis of the stator core / aside from the central axis of the stator core, and the turning portion and the bend portion are both partially located on the side of the layer where the first extension portion is located that is close to the central axis of the stator core / aside from the central axis of the stator core, and partially located on the layer where the first extension portion is located.

[0013] Furthermore, in each conductor of the intermediate coil unit, the first extension portion and the second extension portion are located on the same layer as the interior of the slot adjacent thereto, the turning portion and the second extension portion are located on the same layer, and the turning portion is partially located on the layer where the first extension portion is located, and partially located on the layer where the second extension portion is located.

[0014] Furthermore, when M is an even number, in each conductor of the outer coil unit, the first extension portion and the interior of the slot adjacent to it are located on the same layer, the second extension portion is located on the side of the layer where the first extension portion is located, away from the central axis of the stator core, and the turning portion and the bend portion are partially located on the same layer as the first extension portion, and partially located on the side of the layer where the first extension portion is located, away from the central axis of the stator core.

[0015] Furthermore, when M is an odd number, in each conductor of the outer coil unit, the first extension portion and the second extension portion are located on the same layer as the inside of the slot adjacent to them, the turning portion and the second extension portion are located on the same layer, and the turning portion is partially located on the layer where the first extension portion is located, and partially located on the layer where the second extension portion is located.

[0016] Further, for the coil units located in the same layer in the two slots of each conductor, the projections of each of the turning portions and the second extending portion connected thereto on the axial cross section of the stator core perpendicular to the second extending portion are located on the same straight line.

[0017] Furthermore, the two outer ends of each conductor are respectively an outer end of the incoming line slot and an outer end of the outgoing line slot;

[0018] For conductors of the same phase, multiple conductors are connected in sequence and the outer end of the outlet slot of one conductor and the outer end of the inlet slot of the other conductor of two adjacent conductors along the connection direction are welded, the outer end of the inlet slot located outermost in the connection direction is connected to the phase terminal, and the outer end of the outlet slot located outermost in the connection direction is the neutral point of the phase, except for the neutral point and the outer end of the inlet slot connected to the phase terminal, each of the other slot outer ends is welded to the slot outer end of another conductor located in the same radial direction and adjacent to it and on a different layer from the slot outer end.

[0019] Further, each of the coil units includes a plurality of phase windings, at least two adjacently arranged conductors form a group of phase conductors, which are respectively a first welding conductor, ..., an i-th welding conductor, ..., an N-th welding conductor, N≥i≥1, N≥2, and each of the phase windings includes three groups of phase conductors; the two slot outer ends of each welding conductor are respectively an inlet slot outer end and an outlet slot outer end;

[0020] For conductors of the same phase, the outer end of the outlet slot of one conductor and the outer end of the inlet slot of the other conductor of each group of first welding conductor to Nth welding conductor are connected in sequence and welded, the outer ends of the inlet slot of the first welding conductor to Nth welding conductor located on the outermost sides in the connection direction are connected to the same phase terminal, and the outer ends of the outlet slot of the first welding conductor to Nth welding conductor located on the outermost sides in the connection direction are the neutral points of the phase, except the neutral point and the outer ends of the inlet slot connected to the phase terminal, each of the other outer slot ends is welded to the outer slot end of another conductor located in the same radial direction and adjacent to it and on a different layer as the outer slot end.

[0021] In order to achieve the above object, the present invention further provides a motor, comprising the above motor stator.

[0022] The beneficial effects of the present invention are as follows: the two slot interiors of each conductor in the inner coil unit of the present invention and the slot exterior ends adjacent to the corresponding slot interiors are all located in the same layer, so that the rotor can be inserted from one end of the inner coil unit of the stator winding where the slot exterior ends are arranged. This end of the stator winding has no portion protruding toward the center of the stator core, will not interfere with the installation of the rotor, and will not increase the length of the stator core tooth portion, thereby improving the slot utilization, increasing the power density, reducing the volume of the motor stator, and reducing the cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a motor stator according to Embodiment 1 of the present invention;

[0024] Figure 2 is a schematic structural diagram of a stator core according to Embodiment 1 of the present invention;

[0025] Figure 3is a schematic structural diagram of the stator winding according to the first embodiment of the present invention;

[0026] Figure 4 is a schematic structural diagram of the inner coil unit according to the first embodiment of the present invention;

[0027] Figure 5 is a schematic structural diagram of a first conductor forming A11 in forming an inner coil unit according to the first embodiment of the present invention;

[0028] Figure 6 is a position relationship diagram of a single group of A-phase conductors forming an inner coil unit and a stator core according to the first embodiment of the present invention;

[0029] Figure 7 is a schematic structural diagram of the intermediate side coil unit according to the first embodiment of the present invention;

[0030] Figure 8 is a schematic structural diagram of a second conductor forming an intermediate coil unit according to the first embodiment of the present invention;

[0031] Fig. 9 is a position relationship diagram of a single group of A-phase conductors forming an intermediate coil unit and a stator core according to the first embodiment of the present invention;

[0032] Fig.10 is a schematic structural diagram of the outer coil unit according to the first embodiment of the present invention;

[0033] Fig.11 is a schematic structural diagram of a third conductor forming an outer coil unit according to the first embodiment of the present invention;

[0034] Fig.12 is a position relationship diagram of a type of winding forming an outer coil unit and a stator core in the first embodiment of the present invention;

[0035] Fig.13 is a positional relationship diagram of another type of winding forming an outer coil unit and a stator core in the first embodiment of the present invention;

[0036] Fig.14 is a position relationship diagram of all A-phase conductors in the first embodiment of the present invention;

[0037] Fig.15 is a schematic structural diagram of the stator winding according to the second embodiment of the present invention;

[0038] Fig.16 is a schematic structural diagram of the outer coil unit according to the second embodiment of the present invention;

[0039] Fig.17 is a position relationship diagram of all A-phase conductors in the outer coil unit according to the second embodiment of the present invention;

[0040] Fig.18 is a position relationship diagram of all A-phase conductors in the second embodiment of the present invention;

[0041] Fig.19 is a schematic structural diagram of the stator winding according to the third embodiment of the present invention;

[0042] Fig. 20 is a schematic structural diagram of the inner coil unit according to the third embodiment of the present invention;

[0043] Fig.21 is a position relationship diagram of all A-phase conductors in the third embodiment of the present invention;

[0044] Fig. 22 is a schematic structural diagram of a stator winding according to a fourth embodiment of the present invention;

[0045] Fig.23 4 is a position relationship diagram of all A-phase conductors in the fourth embodiment of the present invention.

[0046] In the figure:

[0047] 1. stator core; 11. teeth;

[0048] 2. stator winding; 21. inner coil unit; 211. inside of the inlet slot; 212. inside of the outlet slot; 213. end of the slot; 214. turning portion of the slot; 2141. first extension portion; 2142. turning portion; 2143. second extension portion; 2144. turning portion;

[0049] 22. Middle coil unit; 23. Outer coil unit;

[0050] 311, first slot; 312, second slot; 313, third slot; 314, fourth slot; 315, fifth slot; 316, sixth slot; 317, seventh slot; 318, eighth slot; 319, ninth slot; 320, tenth slot; 321, eleventh slot; 322, twelfth slot; 323, thirteenth slot; 324, fourteenth slot; 325, fifteenth slot; 326, sixteenth slot; 327, seventeenth slot; 328, eighteenth slot; 329, nineteenth slot; 330, twentieth slot; 331, twenty-first slot; 332, twenty-second slot; 333, twenty-third slot; 334, twenty-fourth slot; 335, twenty-fifth slot; 336, 26th slot; 337, 27th slot; 338, 28th slot; 339, 29th slot; 340, 30th slot; 341, 31st slot; 342, 32nd slot; 343, 33rd slot; 344, 34th slot; 345, 35th slot; 346, 36th slot; 347, 37th slot; 348, 38th slot; 349, 39th slot; 350, 40th slot; 351, 41st slot; 352, 42nd slot; 353, 43rd slot; 354, 44th slot; 355, 45th slot; 356, 46th slot; 357, 47th slot; 358, 48th slot;

[0051] 41. A-phase terminal; 42. B-phase terminal; 43. C-phase terminal; 44. connector. DETAILED DESCRIPTION

[0052] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0053] like Figure 1 As shown, this embodiment provides a motor stator, including a stator core 1 of a cylindrical structure, as shown in FIG. Figure 2 As shown, a plurality of slots are arranged along the axial direction of the stator core 1, and the plurality of slots are evenly distributed along the circumference of the stator core 1. Specifically, the stator core 1 has an annular portion and a plurality of teeth 11 evenly distributed on the inner wall of the annular portion in the circumferential direction, each tooth 11 is arranged to pass through the stator core 1 in the axial direction, and two adjacent teeth 11 form a slot. In this embodiment, the number of slots is 48.

[0054] like Figure 1As shown, the motor stator also includes a stator winding 2, which includes an inner coil unit 21 and an outer coil unit 23 which are sequentially sleeved from the inside to the outside, and each coil unit includes a plurality of conductors with two slots. The stator core is provided with a limiting portion for limiting the inside of the slot of the stator winding in the slot. Specifically, a limiting portion is provided at one end of the radially distributed inner wall of each slot close to the central axis of the stator core, and the limiting portion on a radial inner wall of each slot points to the other radial inner wall of the slot, and a gap is provided between the two limiting portions of each slot. In this embodiment, the radial thickness of the limiting portion is less than the radial thickness of the conductor.

[0055] like Figure 3 As shown, each coil unit includes a plurality of windings, at least two adjacently arranged conductors form a group of phase conductors, and each winding includes three groups of phase conductors. In this embodiment, each group of phase conductors includes two conductors, and the three groups of phase conductors are A-phase conductor, B-phase conductor and C-phase conductor, respectively. The two slots of each conductor are respectively the inside of the inlet slot 211 and the inside of the outlet slot 212, the slot outer turning portion 214 connected to the inside of the two slots and forming a U-shaped structure with the inside of the two slots, and the slot outer end portions 213 connected to the inside of the two slots, respectively. The two slot outer end portions 213 of each conductor are both located at one axial end of the stator core 1, and the slot outer turning portion 214 is located at the other axial end of the stator core 1; each slot outer end portion 213 extends approximately along the circumferential direction of the stator core 1. The above-mentioned A phase, B phase and C phase only represent different phases, and do not represent the current direction, wherein the A phase, B phase and C phase all refer to any one of the U phase, V phase and W phase, and respectively represent different phases.

[0056] The two slot interiors of each conductor in the inner coil unit 21 and the slot outer end 213 connected to the corresponding slot interior are all located on the same layer, so that the rotor can be inserted from one end of the stator winding 2 where the slot outer end 213 is set, and each slot interior of the inner coil unit is in contact with the inner wall and the limit portion of the slot (ignoring the insulating paper). This end of the stator winding 2 has no protruding part toward the center of the stator core 1, will not interfere with the installation of the rotor, and will not increase the length of the tooth portion of the stator core 1, thereby improving the utilization rate of the slot, increasing the power density, reducing the volume of the motor stator, and reducing the cost of the motor.

[0057] Each slot is divided into M layers according to the number of slots that can be accommodated in the radial direction of the stator core 1. M is an integer greater than or equal to 2. There may be an intermediate coil unit 22 between the inner coil unit 21 and the outer coil unit 23, or there may be no intermediate coil unit 22. Specifically, for an even-layer motor with M equal to 2, the number of intermediate coil units 22 is zero. For an odd-layer motor with M=3, the number of intermediate coil units 22 is also zero. Preferably, M is preferably 3-12 layers. When M is an even number, this type of motor is called an even-layer motor. Taking M=4 as an example below, the stator winding 2 of the even-layer motor includes an inner coil unit 21, an intermediate coil unit 22 and an outer coil unit 23. The winding method of the stator winding 2 is described in detail below.

[0058] Pole pitch = number of phases of each winding × number of magnetic poles of each group of phase conductors. Coil units with a pitch smaller than the pole pitch are short-pitch coil units, and coil units with a pitch equal to the pole pitch are full-pitch coil units. In this embodiment, the inner coil unit 21 is a short-pitch coil unit and the other coil units are full-pitch coil units. Specifically, each winding includes three groups of phase conductors, each group of phase conductors includes two conductors, and the number of magnetic poles of each corresponding group of phase conductors is 2, then the pole pitch = 2 × 3 = 6, that is, the pole pitch of the stator winding 2 is six, the pitch of the inner coil unit 21 is five, and the pitch of the other coil units is six. For coil units with a pitch smaller than the pole pitch, M is required to be greater than or equal to 3.

[0059] By using a combination of coil units with a pitch smaller than the pole pitch and coil units with a pitch equal to the pole pitch, the outer ends 213 of each slot can be directly connected by welding, eliminating the use of a bus, simplifying the winding process of the stator winding 2, improving production efficiency, and reducing production costs.

[0060] like Figure 3 As shown, each slot is divided into four layers along the radial direction of the stator core 1 and away from the central axis thereof, namely, the first layer, the second layer, the third layer and the fourth layer.

[0061] like Figure 4 As shown, the two slots of each conductor in the inner coil unit 21 are located in the same layer, as shown in FIG. Figure 4 As shown, the two slots of each conductor are located in the first layer. Since the stator core 1 has 48 slots, the inner coil unit 21 is wound by 24 conductors, that is, the inner coil unit 21 includes four windings, namely the first winding, the second winding, the third winding and the fourth winding. The four windings are evenly distributed along the circumference of the stator core 1, and each winding includes two A-phase conductors, two B-phase conductors and two C-phase conductors distributed in sequence, wherein the inside 211 of the inlet slot of each group of phase conductors is located in two adjacent slots.

[0062] The stator winding 2 is formed by winding a plurality of first conductors, a plurality of second conductors and a plurality of third conductors. Figure 4 and Figure 5 As shown, the inner coil unit 21 is wound by a plurality of first conductors, and each slot outer end 213 extends approximately along the circumference of the stator core 1. Figure 5 , each slot outer end 213 of the first conductor is located on the same side of the slot interior adjacent thereto, specifically, the slot outer end 213 adjacent to the incoming slot interior 211 is located on the right side of the incoming slot interior 211, and the slot outer end 213 adjacent to the outgoing slot interior 212 is also located on the right side of the outgoing slot interior 212, and the slot outer ends 213 of the inner coil unit 21 are distributed in the same direction along the circumferential direction of the stator core 1 relative to the corresponding slot inner ends, that is, relative to the slot interior in the clockwise direction (refer to Figure 4 Clockwise (as shown in ).

[0063] In each group of phase conductors of the inner coil unit 21, the distribution directions of the inside of the inlet slot 211 and the inside of the outlet slot 212 of each conductor along the circumferential direction of the stator core 1 are opposite, referring to Figure 5 and Figure 6 , the inside of the inlet groove 211 and the outlet groove 212 of the A phase conductor A11 are rotated in a clockwise direction (refer to Figure 7 The inside of the inlet slot 211 and the inside of the outlet slot 212 of the A phase conductor A12 are distributed in the counterclockwise direction (with the Figure 7 The distribution is in the opposite direction to the clockwise direction shown in the figure.

[0064] The two slot interiors of each conductor in the inner coil unit 21 and the slot outer end 213 adjacent to each slot interior are located in the same layer and are all located in the first layer. In the inner coil unit 21, the inlet slot interiors 211 of the multiple conductors of each winding are sequentially accommodated in adjacent slots; along the circumferential distribution direction of the stator core 1, the number of slots between the adjacent two inlet slot interiors 211 of two adjacent windings of the inner coil unit 21 is six, for example: the slot where the inlet slot interior 211 of C12 in the C-phase conductor of the first winding is located and the slot where the inlet slot interior 211 of A13 in the A-phase conductor of the second winding is located is six slots apart.

[0065] The winding distribution of the four windings of the inner coil unit 21 is the same, and the following only describes the winding distribution of two adjacent windings (the first winding and the second winding) in detail. Figure 2 and Figure 4In the first winding, the inside 211 of the inlet slot of A11 is located at the first layer of the first slot 311, and the inside 212 of the outlet slot of A11 is located at the first layer of the forty-fourth slot 354; the inside 211 of the inlet slot of A12 is located at the first layer of the second slot 312, and the inside 212 of the outlet slot of A12 is located at the first layer of the seventh slot 317; the inside 211 of the inlet slot of B11 is located at the first layer of the third slot 313, and the inside 212 of the outlet slot of B11 is located at the first layer of the forty-sixth slot 356. The first layer; the interior 211 of the inlet slot of B12 is located at the first layer of the fourth slot 314, and the interior 212 of the outlet slot of B12 is located at the first layer of the ninth slot 319; the interior 211 of the inlet slot of C11 is located at the first layer of the fifth slot 315, and the interior 212 of the outlet slot of C11 is located at the first layer of the forty-eighth slot 358; the interior 211 of the inlet slot of C11 is located at the first layer of the sixth slot 316, and the interior 212 of the outlet slot of C11 is located at the first layer of the eleventh slot 321.

[0066] In the second winding, the inside 211 of the inlet slot of A13 is located at the first layer of the thirteenth slot 323, and the inside 212 of the outlet slot of A13 is located at the first layer of the eighth slot 318; the inside 211 of the inlet slot of A14 is located at the first layer of the fourteenth slot 324, and the inside 212 of the outlet slot of A14 is located at the first layer of the nineteenth slot 329; the inside 211 of the inlet slot of B13 is located at the first layer of the fifteenth slot 325, and the inside 212 of the outlet slot of B13 is located at the first layer of the tenth slot 320 ; The interior 211 of the inlet slot of B14 is located at the first layer of the sixteenth slot 326, and the interior 212 of the outlet slot of B14 is located at the first layer of the twenty-first slot 331; the interior 211 of the inlet slot of C13 is located at the first layer of the seventeenth slot 327, and the interior 212 of the outlet slot of C13 is located at the first layer of the twelfth slot 322; the interior 211 of the inlet slot of C14 is located at the first layer of the eighteenth slot 328, and the interior 212 of the outlet slot of C14 is located at the first layer of the twenty-third slot 333.

[0067] The slot outer turning portion 214 includes a first extension portion 2141, a turning portion 2142, a second extension portion 2143 and a bend portion 2144 which are connected in sequence, and the first extension portion 2141 and the bend portion 2144 are respectively connected to the inside of two slots; in each conductor of the inner coil unit 21, the first extension portion 2141 and the inside of the slot adjacent thereto are located in the same layer and are both located in the first layer; in each conductor of the inner coil unit 21, the second extension portion 2143 is located on the side of the layer where the first extension portion 2141 is located, close to the central axis of the stator core 1, and the turning portion 2142 and the bend portion 2144 are both partially located on the side of the layer where the first extension portion 2141 is located, close to the central axis of the stator core 1, and partially located in the layer where the first extension portion 2141 is located. Through the cooperation of the turning portion 2142 and the turning portion 2144, the inside of the two slots are both located in the first layer, and the entire turning portion 214 outside the slot is located in the first layer, and the other part is protruded to the side close to the central axis of the stator core 1. This position is called the virtual zero layer.

[0068] Since the structure of each slot outer turning part in each phase winding of the inner coil unit 21 is the same as that of the corresponding slot outer turning part in other windings, their positions can be determined according to the corresponding slot interior, and the following is a detailed description of the distribution of the slot outer turning parts corresponding to A11 and A12. Example: The inside 211 of the incoming slot of A11 is located in the first layer of the first slot 311, the first extension 2141 connected to the inside 211 of the incoming slot of A11 is located in the first layer, the turning part 2142 crosses from the first layer to the virtual zero layer, the second extension 2143 is located in the virtual zero layer, the turning part 2144 crosses from the virtual zero layer to the first layer, and then connects to the inside 212 of the outgoing slot of A11. The inside of the A12 inlet slot 211 is located at the first layer of the first slot 311, the turning portion 2144 connected to the inside of the A12 inlet slot 211 crosses from the first layer to the virtual zero layer, the second extension portion 2143 connected to the turning portion 2144 is located at the virtual zero layer, the turning portion 2142 connected to the second extension portion 2143 crosses from the virtual zero layer to the first layer, the first extension portion 2141 connected to the turning portion 2142 is located at the first layer, and then connected to the inside of the outlet slot 212. Moreover, in this embodiment, the projections of the turning portion 2144 and the second extension portion 2143 connected thereto on the axial section of the stator core 1 parallel to the second extension portion 2143 are located on the same straight line, and in the projection on the axial section of the stator core 1 perpendicular to the second extension portion, the length of the turning portion 2144 is twice the width of a single conductor.

[0069] In this embodiment, the turning portion 2144 of the inner coil unit 21 can also be protruded from the layer where the second extension portion 2143 is located to the side away from the central axis of the stator core 1. The following is a detailed description of the distribution of the outer turning portion of the slot corresponding to A11. Example: The interior 211 of the incoming line slot of A11 is located in the first layer of the first slot 311, the first extension portion 2141 connected to the interior 211 of the incoming line slot of A11 is located in the first layer, the turning portion 2142 crosses from the first layer to the second layer, the second extension portion 2143 is located in the second layer, the turning portion 2144 crosses from the second layer to the first layer, and then is connected to the interior 212 of the outgoing line slot of A11.

[0070] like Figure 7 As shown, each conductor of the middle coil unit 22 includes two slot interiors and the two slot interiors are located in two adjacent layers, specifically occupying the second layer and the third layer in the stator core 1 respectively, and the slot outer end 213 adjacent to each slot interior and the slot interior are located in the same layer; the stator core 1 has 48 slots, so the inner coil unit 21 is wound by 48 conductors, which are divided into eight windings, namely the first winding, the second winding, ..., the eighth winding, and the eight windings are evenly distributed along the circumference of the stator core 1.

[0071] The middle coil unit 22 is formed by winding a plurality of second conductors. Figure 8 Each slot outer end 213 of the second conductor extends along the circumference of the stator core 1 and away from the other slot outer end 213. Fig. 9 As shown, in each group of phase conductors of the intermediate coil unit 22, the inside of the inlet slot 211 and the inside of the outlet slot 212 of each conductor are distributed in the same direction along the circumferential direction of the stator core 1, and the inside of the inlet slot 211 and the inside of the outlet slot 212 of the A phase conductor A21 are arranged in a counterclockwise direction (refer to Fig. 9 The inside of the inlet slot 211 and the inside of the outlet slot 212 of the A-phase conductor A22 are also distributed in the counterclockwise direction (refer to Fig. 9 Counterclockwise as shown in the figure). Figure 7 In the middle coil unit 22, the slot outer ends 213 located in the same layer are distributed in the same direction along the circumference of the stator core 1, and the slot outer ends 213 located in two adjacent layers are distributed in opposite directions along the circumference of the stator core 1, that is, the slot outer ends 213 located in the second layer are distributed in the counterclockwise direction (refer to Figure 7 The outer ends 213 of the grooves located in the third layer are bent and distributed in a clockwise direction (in the counterclockwise direction shown in FIG. Figure 7 The distribution is curved in the opposite direction of the counterclockwise direction shown in FIG.

[0072] In the intermediate coil unit 22, the inlet slots 211 of the multiple conductors of each winding are sequentially accommodated in adjacent slots; along the circumferential distribution direction of the stator core 1, the slots where the inlet slots 211 of two adjacent windings of the intermediate coil unit 22 are located are adjacent to each other, for example: the slot where the inlet slot 211 of C22 of the first winding is located and the slot where the inlet slot 211 of A23 of the second winding is located are adjacent to each other. In each conductor of the intermediate coil unit 22, the first extension portion 2141 and the second extension portion 2143 are both located at the same layer as the slots adjacent thereto, the turning portion 2144 and the second extension portion 2143 are located at the same layer, part of the turning portion 2142 is located at the layer where the first extension portion 2141 is located, and part of it is located at the layer where the second extension portion 2143 is located, and the turning portion 2142 is used to realize that the two slots of each conductor are located at the second layer and the third layer respectively.

[0073] Each slot outer turning portion of the intermediate coil unit 22 is partially located on the second layer and partially located on the third layer. Since the structure of each slot outer turning portion of the intermediate coil unit 22 is the same, its position can be determined according to the corresponding slot interior. The following is a detailed description of the distribution of the slot outer turning portion corresponding to A21. Example: The inside 211 of the incoming slot of A21 is located on the second layer of the first slot 311, the first extension portion 2141 connected to the inside 211 of the incoming slot of A21 is located on the second layer, the turning portion 2142 crosses from the second layer to the third layer, the second extension portion 2143 is located on the third layer, and the turning portion 2144 is also located on the third layer, and then connected to the inside 212 of the outgoing slot of A21. Moreover, in this embodiment, the projections of the turning portion 2144 and the second extension portion 2143 connected thereto on the axial section of the stator core 1 parallel to the second extension portion 2143 are located on the same straight line. The turning portion 2144 may have a turn within the third layer, but needs to be completely within the third layer, or may have no turn, that is, the turning portion 2144 and the second extension portion 2143 constitute a straight line structure.

[0074] Since the eight windings of the middle coil unit 22 have the same distribution pattern, and each slot outer end 213 of each conductor is located at the same layer as the inside of the slot adjacent to it, and the first extension portion 2141, the second extension portion 2143, the turning portion 2142 and the turning portion 2144 can all be confirmed based on the distribution pattern inside the two slots of each conductor, the following is a detailed description of the specific pattern inside the slots of two adjacent windings (the first winding and the second winding) as an example.

[0075] Specific reference Figure 2 and Fig. 9In the first winding, the inside of the inlet slot 211 of A21 is located at the second layer of the first slot 311, and the inside of the outlet slot 212 of A21 is located at the third layer of the seventh slot 317; the inside of the inlet slot 211 of A22 is located at the second layer of the second slot 312, and the inside of the outlet slot 212 of A22 is located at the third layer of the eighth slot 318; the inside of the inlet slot 211 of B21 is located at the second layer of the third slot 313, and the inside of the outlet slot 212 of B21 is located at the third layer of the ninth slot 319. Three layers; the interior 211 of the inlet slot of B22 is located at the second layer of the fourth slot 314, and the interior 212 of the outlet slot of B22 is located at the third layer of the tenth slot 320; the interior 211 of the inlet slot of C21 is located at the second layer of the fifth slot 315, and the interior 212 of the outlet slot of C21 is located at the third layer of the eleventh slot 321; the interior 211 of the inlet slot of C22 is located at the second layer of the sixth slot 316, and the interior 212 of the outlet slot of C22 is located at the third layer of the twelfth slot 322.

[0076] In the second winding, the inside 211 of the inlet slot of A23 is located at the second layer of the seventh slot 317, and the inside 212 of the outlet slot of A23 is located at the third layer of the thirteenth slot 323; the inside 211 of the inlet slot of A24 is located at the second layer of the eighth slot 318, and the inside 212 of the outlet slot of A24 is located at the third layer of the fourteenth slot 324; the inside 211 of the inlet slot of B24 is located at the second layer of the ninth slot 319, and the inside 212 of the outlet slot of B24 is located at the third layer of the fifteenth slot 325. layer; the interior 211 of the inlet slot of B25 is located at the second layer of the tenth slot 320, and the interior 212 of the outlet slot of B25 is located at the third layer of the sixteenth slot 326; the interior 211 of the inlet slot of C24 is located at the second layer of the eleventh slot 321, and the interior 212 of the outlet slot of C24 is located at the third layer of the seventeenth slot 327; the interior 211 of the inlet slot of C25 is located at the second layer of the twelfth slot 322, and the interior 212 of the outlet slot of C25 is located at the third layer of the eighteenth slot 328.

[0077] like Fig.10 As shown, each conductor of the outer coil unit 23 includes two slots and the two slots are located in the same layer of the stator core 1, that is, located in the fourth layer of the stator core 1, and the slot outer ends 213 adjacent to each slot are also located in the fourth layer; the stator core 1 has 48 slots, then the inner coil unit 21 is wound by 24 conductors, which are divided into four windings, namely the first winding, the second winding, the third winding and the fourth winding, and the four windings are evenly distributed along the circumference of the stator core 1.

[0078] The outer coil unit 23 is formed by winding a plurality of third conductors. Fig.11 Each slot outer end of the third conductor is located in the same layer as the inner part of the slot adjacent to it, and the slot outer end 213 of the outer coil unit 23 is distributed in the same direction along the circumferential direction of the stator core 1 relative to the corresponding slot inner end, that is, relative to the inner part of the slot in the clockwise direction (refer to Fig.12 Clockwise (as shown in ).

[0079] The second extension portion 2143 of each conductor in the outer coil unit 23 is located on the side of the layer where the first extension portion 2141 is located, away from the central axis of the stator core 1. The turning portion 2142 and the turning portion 2144 are both partially located on the side of the layer where the first extension portion 2141 is located, away from the central axis of the stator core 1, and partially located on the layer where the first extension portion 2141 is located, so that the entire portion of the turning portion 214 outside the slot is located on the fourth layer, and the other portion protrudes to the side away from the central axis of the stator core 1. This position is called the virtual fifth layer.

[0080] Since the structure of each outer slot turning part of the outer coil unit 23 is the same, its position can be determined according to the corresponding slot interior. The following is a detailed description of the distribution of the outer slot turning part corresponding to A31. Example: The interior 211 of the incoming slot of A31 is located at the fourth layer of the first slot 311, the first extension 2141 connected to the interior of the incoming slot of A31 is located at the fourth layer, the turning part 2142 crosses from the fourth layer to the virtual fifth layer, the second extension 2143 is located at the virtual fifth layer, the turning part 2144 crosses from the virtual fifth layer to the fourth layer, and then connects to the interior 212 of the outgoing slot of A31. Moreover, in this embodiment, the projections of the turning part 2144 and the second extension 2143 connected thereto on the axial section of the stator core 1 parallel to the second extension 2143 are located on the same straight line, and in the projection on the axial section of the stator core 1 perpendicular to the second extension, the length of the turning part 2144 is twice the width of a single conductor.

[0081] In this embodiment, the inner coil unit 21 is wound by multiple first conductors, the middle coil unit 22 is wound by multiple second conductors, and the outer coil unit 23 is wound by multiple third conductors. Each coil unit is wound with conductors of the same structure, which simplifies the winding method and improves the winding efficiency.

[0082] like Fig.12 As shown, in the outer coil unit 23, the multiple inlet slots 211 of each winding are sequentially accommodated in adjacent slots, and the slots where the adjacent two inlet slots 211 of two adjacent groups of phase conductors of each winding are located are spaced by six slots. For example, the inlet slot 211 of A31 of the first winding is located in the first slot, the inlet slot 211 of A32 of the first winding is located in the second slot, and the inlet slot 211 of C32 of the first winding is located in the sixth slot, then the inlet slot 211 of A33 of the second winding is located in the thirteenth slot.

[0083] The distribution directions of the inside of the inlet slot 211 and the inside of the outlet slot 212 of two adjacent groups of phase conductors in each phase winding along the circumferential direction of the stator core 1 are opposite. For example, the inside of the inlet slot 211 and the inside of the outlet slot 212 of A31 and A32 are both in the clockwise direction (refer to Fig.12 The inside of the inlet trough 211 and the inside of the outlet trough 212 of B31 and B32 are both arranged in the counterclockwise direction (with the same Fig.12 The inside of the inlet trough 211 and the outlet trough 212 of C31 and C32 are both arranged in the clockwise direction (refer to Fig.12 Clockwise as shown in the figure).

[0084] In this embodiment, in the outer coil unit 23, the distribution direction of the inlet slots 211 and the outlet slots 212 of the two adjacent groups of phase conductors in each phase winding along the circumferential direction of the stator core 1 can also be the same. For example, the inlet slots 211 and the outlet slots 212 of A31 and A32 are both in the clockwise direction (refer to Fig.13 The inside of the inlet trough 211 and the inside of the outlet trough 212 of B31 and B32 are both arranged in the clockwise direction (refer to Fig.13 The inside of the inlet trough 211 and the outlet trough 212 of C31 and C32 are both arranged in the clockwise direction (refer to Fig.13 Clockwise as shown in the figure).

[0085] Since the distribution patterns of the four windings of the outer coil unit 23 are the same, and each slot outer end 213 is located on the same layer as the interior of the slot adjacent to it, and the first extension portion 2141, the second extension portion 2143, the turning portion 2142 and the turning portion 2144 can all be confirmed by referring to the distribution patterns of the slot interior and the slot outer turning portion, the following is a detailed description of the specific patterns of the slot interior of two adjacent windings (the first winding and the second winding) as an example.

[0086] Specific reference Figure 2 and Fig.12In the first winding, the inside 211 of the inlet slot of A31 is located at the fourth layer of the first slot 311, and the inside 212 of the outlet slot of A31 is located at the fourth layer of the seventh slot 317; the inside 211 of the inlet slot of A32 is located at the fourth layer of the second slot 312, and the inside 212 of the outlet slot of A32 is located at the fourth layer of the eighth slot 318; the inside 211 of the inlet slot of B31 is located at the fourth layer of the third slot 313, and the inside 212 of the outlet slot of B31 is located at the fourth layer of the forty-fifth slot 355. Four layers; the interior 211 of the incoming line slot of B32 is located at the fourth layer of the fourth slot 314, and the interior 212 of the outgoing line slot of B32 is located at the fourth layer of the forty-sixth slot 356; the interior 211 of the incoming line slot of C31 is located at the fourth layer of the fifth slot 315, and the interior 212 of the outgoing line slot of C31 is located at the fourth layer of the eleventh slot 321; the interior 211 of the incoming line slot of C32 is located at the fourth layer of the sixth slot 316, and the interior 212 of the outgoing line slot of C32 is located at the fourth layer of the twelfth slot 322.

[0087] In the second winding, the inside 211 of the inlet slot of A33 is located at the fourth layer of the thirteenth slot 323, and the inside 212 of the outlet slot of A33 is located at the fourth layer of the nineteenth slot 329; the inside 211 of the inlet slot of A34 is located at the fourth layer of the fourteenth slot 324, and the inside 212 of the outlet slot of A34 is located at the twentieth layer of the eighth slot 318; the inside 211 of the inlet slot of B33 is located at the fourth layer of the fifteenth slot 325, and the inside 212 of the outlet slot of B33 is located at the fourth layer of the ninth slot 319. layer; the interior 211 of the incoming line slot of B34 is located at the fourth layer of the sixteenth slot 326, and the interior 212 of the outgoing line slot of B34 is located at the fourth layer of the tenth slot 320; the interior 211 of the incoming line slot of C33 is located at the fourth layer of the seventeenth slot 327, and the interior 212 of the outgoing line slot of C33 is located at the fourth layer of the eighteenth slot 328; the interior 211 of the incoming line slot of C34 is located at the fourth layer of the twenty-third slot 333, and the interior 212 of the outgoing line slot of C34 is located at the fourth layer of the twenty-fourth slot 334.

[0088] When the slot outer ends 213 of the even-numbered-layer motor are welded in series, the two slot outer ends of each conductor are the incoming slot outer end and the outgoing slot outer end respectively; for conductors of the same phase, multiple conductors are connected in sequence and the outgoing slot outer end of one conductor of two adjacent conductors along the connection direction is welded to the incoming slot outer end of the other conductor, the incoming slot outer end located at the outermost side in the connection direction is connected to the phase terminal, and the outgoing slot outer end located at the outermost side in the connection direction is the neutral point of the phase, except for the neutral point and the incoming slot outer end connected to the phase terminal, each of the other slot outer ends 213 is welded to the slot outer end 213 of another conductor that is located in the same radial direction and adjacent to it and is located on a different layer from the slot outer end 213.

[0089] Since the series connection method of all A-phase conductors, the series connection method of all B-phase conductors, and the series connection method of all C-phase conductors are the same, the following only takes the series connection method of all A-phase conductors as an example for detailed description. Fig.14 , the series welding process of all A-phase conductors is as follows:

[0090] The A-phase terminal 41 is connected to the outer end of the inlet slot of one of the conductors, and all A-phase conductors are sorted according to the welding sequence, with Ai, i=1, 2, 3, ..., 32, Ai-1 is the outer end of the inlet slot of a single conductor, and Ai-2 is the outer end of another outlet slot of a single conductor.

[0091] A1-1 to A1-2, A1-2 welded to A2-1, A2-1 to A2-2, A2-2 welded to A3-1, A3-1 to A3-2, A3-2 welded to A4-1, A4-1 to A4-2, A4-2 welded to A5-1, A5-1 to A5-2, A5-2 welded to A6-1, A6-1 to A6-2, A6-2 welded to A7-1, A7-1 to A7-2, A7-2 welded to A8-1, A8-1 to A8-2, A8-2 welded to A9-1, A9-1 to A9-2, A9- 2 welded to A10-1, A10-1 to A10-2, A10-2 welded to A11-1, A11-1 to A11-2, A11-2 welded to A12-1, A12-1 to A12-2, A12-2 welded to A13-1, A13-1 to A13-2, A13-2 welded to A14-1, A14-1 to A14-2, A14-2 welded to A15-1, A15-1 to A15-2, A15-2 welded to A16-1, A16-1 to A17-2, A17-2 welded to A18 -1, A1-18 to A18-2, A18-2 welded to A19-1, A19-1 to A19-2, A19-2 welded to A20-1, A20-1 to A20-2, A20-2 welded to A21-1, A21-1 to A21-2, A21-2 welded to A22-1, A22-1 to A22-2, A22-2 welded to A23-1, A23-1 to A23-2, A23-2 welded to A24-1, A24-1 to A24-2, A24-2 welded to A25-1, A25- 1 to A25-2, A25-2 is welded to A26-1, A26-1 to A26-2, A26-2 is welded to A27-1, A27-1 to A27-2, A27-2 is welded to A28-1, A28-1 to A28-2, A282 is welded to A29-1, A29-1 to A29-2, A29-2 is welded to A30-1, A30-1 to A30-2, A30-2 is welded to A31-1, A31-1 to A31-2, A31-2 is welded to A32-1, A32-1 to A32-2.

[0092] All B-phase conductors are led out with B-phase terminals 42 and B32-2, and all C-phase conductors are led out with C-phase terminals 43 and C32-2. A32-2, B32-2 and C32-2 are connected at neutral points by a connector 44, thus completing the series welding of the stator winding 2 of the even-layer motor. The welding method may be ultrasonic welding, laser welding or friction stir welding.

[0093] This embodiment uses welding to connect the outer slot ends 213 and uses a connector 44 for neutral point connection, without the need for a bus bar. This greatly simplifies the connection between the multiple outer slot ends 213 of the motor stator, simplifies the processing technology, reduces production costs, and improves production efficiency.

[0094] This embodiment also provides a motor, including the above-mentioned motor stator. The motor using the above-mentioned motor stator can reduce production costs and improve production efficiency.

[0095] Embodiment 2

[0096] The difference between this embodiment and the first embodiment is that Fig.15 As shown, M is an odd number, and this type of motor is called an odd-layer motor. In this embodiment, M=5, that is, the number of slots that can be accommodated in the radial direction of the stator core 1 divides each slot into five layers, namely the first layer, the second layer, the third layer, the fourth layer and the fifth layer. The distribution of the inner coil unit 21 and the middle coil unit 22 is the same as that in the first embodiment, and only the specific distribution law of the outer coil unit 23 is described in detail below.

[0097] like Fig.16 As shown, the two slot interiors of each conductor in the outer coil unit 23 are located in two adjacent layers, the slot outer end portion 213 adjacent to the slot interior close to the middle coil unit 22 is located in the same layer as the slot interior, that is, located in the fourth layer, and part of the slot outer end portion 213 adjacent to the slot interior located in the outermost layer is located in the same layer as the slot interior, that is, located in the fifth layer, and the other slot outer end portions 213 adjacent to the slot interior located in the outermost layer extend from the layer where the slot interior is located to the side away from the central axis of the stator core 1, that is, extend from the fifth layer to the outside of the fifth layer. In this embodiment, the part located outside the fifth layer is recorded as the virtual sixth layer.

[0098] In this embodiment, the outer coil unit 23 is wound by multiple first conductors and multiple second conductors, that is, the outer coil unit 23 is composed of two types of conductors, and the inner coil unit 21 and the middle coil unit 22 are respectively wound by multiple first conductors and multiple second conductors.

[0099] like Fig.16As shown, in the outer coil unit 23, the slot outer ends 213 located in the same layer have the same distribution direction along the circumference of the stator core 1, and the slot outer ends 213 located in two adjacent layers have opposite distribution directions along the circumference of the stator core 1; the slot outer ends 213 extending from the outermost layer to the side away from the central axis of the stator core 1 have the same distribution direction along the circumference of the stator core 1, and are opposite to the distribution direction of the slot outer ends 213 located on the outermost layer along the circumference of the stator core 1. Specifically, the slot outer ends 213 adjacent to the inside of the slot close to the middle coil unit 22 have the same distribution direction along the circumference of the stator core 1, that is, each slot outer end 213 located in the fourth layer is distributed counterclockwise (with the center axis of the stator core 1). Fig.16 The slot outer end 213 located on the fifth layer is distributed in the clockwise direction of the stator core 1, and the slot outer end 213 extending from the fifth layer to the side away from the central axis of the stator core 1 is distributed in the counterclockwise direction of the stator core 1.

[0100] The distribution law of the slot outer turning portion 214 of the outer coil unit 23 is the same as the distribution law of the slot outer turning portion 214 of the middle coil unit 22, and will not be described in detail here. Since the distribution law of the A-phase conductor, the B-phase conductor and the C-phase conductor in the outer coil unit 23 is the same, and the slot and layer distribution law of the slot inside the outer coil unit 23 is the same as the slot and layer distribution law of the middle coil unit 22, except that the two slots of each conductor of the outer coil unit 23 are respectively located in the fourth layer and the fifth layer, the distribution law of the slot outer end portion 213 in the outer coil unit 23 is specifically described below by taking the A-phase conductor in the outer coil unit 23 as an example.

[0101] like Fig.17 As shown, the two slot outer ends 213 of each conductor are respectively used as the outer ends of the incoming slot and the outer ends of the outgoing slot, the slot outer ends 213 located at the outermost layer are selected as the outer ends of the incoming slot, and each conductor of the outer coil unit 23 is recorded as A3j, the outer end 213 of the incoming slot of A3j is recorded as A3j-1, and the outer end 213 of the outgoing slot is recorded as A3j-2, j=1, 2, 3, ..., 16.

[0102] A31-1 is located from the fifth layer to the virtual sixth layer and is led out along the axial direction of the stator core 1, and A31-2 is located on the fourth layer and is led out in the counterclockwise direction (with Fig.17 A32-1 extends from the fifth floor to the virtual sixth floor and in the counterclockwise direction, and A32-2 is located on the fourth floor and extends in the counterclockwise direction; A33-1 extends from the fifth floor to the virtual sixth floor and in the counterclockwise direction, and A33-2 is located on the fourth floor and extends in the counterclockwise direction; A34-1 is located on the fifth floor and in the clockwise direction (refer to Fig.17) extends in the clockwise direction as shown in , A34-2 is located on the fourth floor and extends in the counterclockwise direction; A35-1 extends from the fifth floor to the imaginary sixth floor and extends in the counterclockwise direction, A35-2 is located on the fourth floor and extends in the counterclockwise direction; A36-1 extends from the fifth floor to the imaginary sixth floor and extends in the counterclockwise direction, A36-2 is located on the fourth floor and extends in the counterclockwise direction; A37-1 is located on the fifth floor and extends in the clockwise direction, A37-2 is located on the fourth floor and extends in the counterclockwise direction; A38-1 is located on the fifth floor and extends in the clockwise direction, A38-2 is located on the fourth floor and extends in the counterclockwise direction; A39-1 extends from the fifth floor to the imaginary sixth floor and extends in the counterclockwise direction, A39-2 is located on the fourth floor and extends in the counterclockwise direction; A310-1 extends from the fifth floor to the imaginary sixth floor and extends in the counterclockwise direction, A310-2 Located on the fourth floor and extending in the counterclockwise direction; A311-1 is located on the fifth floor and extends in the clockwise direction, A311-2 is located on the fourth floor and extends in the counterclockwise direction; A312-1 is located on the fifth floor and extends in the clockwise direction, A312-2 is located on the fourth floor and extends in the counterclockwise direction; A313-1 extends from the fifth floor to the imaginary sixth floor and in the counterclockwise direction, A313-2 is located on the fourth floor and extends in the counterclockwise direction; A314-1 extends from the fifth floor to the imaginary sixth floor and in the counterclockwise direction, A314-2 is located on the fourth floor and extends in the counterclockwise direction; A315-1 is located on the fifth floor and extends in the clockwise direction, A315-2 is located on the fourth floor and extends in the counterclockwise direction; A316-1 is located on the fifth floor and extends in the clockwise direction, A316-2 is located on the fourth floor and extends in the counterclockwise direction.

[0103] When the slot outer ends 213 of the odd-numbered layers of the motor are welded in series, the welding rule is the same as the series welding rule of the slot outer ends 213 of the even-numbered layers of the motor. The series welding process of all A-phase conductors is as follows:

[0104] like Fig.18 As shown, the outer end of the incoming line slot of one of the conductors is connected by the A-phase terminal 41, and all A-phase conductors are sorted according to the welding sequence, with Aa, a=1, 2, 3, ..., 40, Aa-1 is the outer end of the incoming line slot of a single conductor, and Aa-2 is the outer end of the outgoing line slot of a single conductor.

[0105] A1-1 to A1-2, A1-2 connected to A2-1, A2-1 to A2-2, A2-2 connected to A3-1, A3-1 to A3-2, A3-2 connected to A4-1, A4-1 to A4-2, A4-2 connected to A5-1, A5-1 to A5-2, A5-2 connected to A6-1, A6-1 to A6-2, A6-2 connected to A7-1, A7-1 to A7-2, A7-2 connected to A8-1, A8-1 to A8-2, A8-2 connected to A9-1, A9-1 to A9-2, A9-2 connected to A10-1, A10-1 to A10-2, A10-2 connected to A11-1, A11-1 to A11-2, A11- 2 connects A12-1, A12-1 to A12-2, A12-2 connects A13-1, A13-1 to A13-2, A13-2 connects A14-1, A14-1 to A14-2, A14-2 connects A15-1, A15-1 to A15-2, A15-2 connects A16-1, A16-1 to A17-2, A17-2 connects A18-1, A1-18 to A18-2, A18-2 connects A19-1, A19-1 to A19-2, A19-2 connects A20-1, A20-1 to A20-2, A20-2 connects A21-1, A21-1 to A21-2, A21-2 connects A22- 1, A22-1 to A22-2, A22-2 connected to A23-1, A23-1 to A23-2, A23-2 connected to A24-1, A24-1 to A24-2, A24-2 connected to A25-1, A25-1 to A25-2, A25-2 connected to A26-1, A26-1 to A26-2, A26-2 connected to A27-1, A27-1 to A27-2, A27-2 connected to A28-1, A28-1 to A28-2, A282 connected to A29-1, A29-1 to A29-2, A29-2 connected to A30-1, A30-1 to A30-2, A30-2 connected to A31-1, A31-1 to A31-2, A31-2 is connected to A32-1, A32-1 to A32-2, A32-2 is connected to A33-1, A33-1 to A33-2, A33-2 is connected to A34-1, A34-1 to A34-2, A34-2 is connected to A35-1, A35-1 to A35-2, A35-2 is connected to A36-1, A36-1 to A36-2, A36-2 is connected to A37-1, A37-1 to A37-2, A37-2 is connected to A38-1, A38-1 to A38-2, A38-2 is connected to A39-1, A39-1 to A39-2, A39-2 is connected to A40-1, A40-1 to A40-2.

[0106] All B-phase conductors are led out with B-phase terminals 42 and B40-2, and all C-phase conductors are led out with C-phase terminals 43 and C40-2. The three points A40-2, B40-2 and C40-2 are connected at the neutral point using a connector 44, thus completing the series welding of the stator winding 2 of the odd-layer motor.

[0107] Embodiment 3

[0108] like Fig.19 As shown, the stator winding 2 in this embodiment can realize the parallel connection of even-layer motors, and the winding method of the inner coil unit is different from that of the first embodiment, such as Fig. 20 As shown, in this embodiment, the pitch of the inner coil unit 21 is six, and its structure is the same as that of the outer coil unit 23 of the first embodiment. The structures of the outer coil unit 23 and the middle coil unit 22 are respectively the same as those of the outer coil unit 23 and the middle coil unit 22 of the first embodiment, and will not be described in detail here.

[0109] When the outer ends of the slots of the even-numbered layers of motors are welded in parallel, each of the coil units includes a plurality of phase windings, at least two adjacently arranged conductors form a group of phase conductors, namely the first welding conductor, ..., the i-th welding conductor, ..., the N-th welding conductor, N≥i≥1, N≥2, each of the phase windings includes three groups of phase conductors; the two outer ends of each welding conductor are the outer ends of the incoming line slot and the outer ends of the outgoing line slot; for conductors of the same phase, each group of the first welding conductor to the N-th welding conductor is connected in sequence and the two conductors adjacent to each other along the connection direction are connected in sequence. The outer end of the outlet slot of one conductor is welded to the outer end of the inlet slot of another conductor, the outer ends of the inlet slot of the first welding conductor to the N-th welding conductor located at the outermost side in the connection direction are connected to the same phase terminal, and the outer ends of the outlet slot of the first welding conductor to the N-th welding conductor located at the outermost side in the connection direction are the neutral point of the phase, except for the neutral point and the outer end of the inlet slot connected to the phase terminal, each of the other outer slot ends 213 is welded to the outer slot end 213 of another conductor that is located in the same radial direction and adjacent to it and is located on a different layer from the outer slot end 213.

[0110] Since the parallel connection method of all A-phase conductors, the parallel connection method of all B-phase conductors, and the parallel connection method of all C-phase conductors are the same, the following only takes the parallel connection method of all A-phase conductors as an example for detailed description. Fig.21 As shown, the specific parallel welding process of all A-phase conductors is as follows:

[0111] The two outer ends of the A-phase conductor of a winding are connected simultaneously by the A-phase terminal 41, and all A-phase conductors are sorted according to the welding sequence, with Ai, i=1, 2, 3, ..., 32, Ai-1 is the outer end of the single conductor's inlet slot, and Ai-2 is the outer end of the single conductor's outlet slot.

[0112] Terminal A is connected to A1-1 and A2-1 at the same time, A1-1 to A1-2, A2-1 to A2-2, A1-2 to A3-1, A3-1 to A3-2, A3-2 to A5-1, A5-1 to A5-2, A5-2 to A7-1, A7-1 to A7-2, A7-2 to A9-1, A9-1 to A9-2, A9-2 to A11-1, A11-1 to A11-2, A11-2 to A13-1, A13-1 to A13-2, A13-2 to A15-1, A15-1 to A 15-2, A15-2 is connected to A17-1, A17-1 to A17-2, A17-2 is connected to A19-1, A19-1 to A19-2, A19-2 is connected to A21-1, A21-1 to A21-2, A21-2 is connected to A23-1, A23-1 to A23-2, A23-2 is connected to A25-1, A25-1 to A27-1, A27-1 to A27-2, A27-2 is connected to A29-1, A29-1 to A29-2, A29-2 is connected to A31-1, A31-1 to A31-2.

[0113] At the same time, the A2-1 side is connected, A2-1 to A2-2, A2-2 is connected to A4-1, A4-1 to A4-2, A4-2 is connected to A6-1, A6-1 to A6-2, A6-2 is connected to A8-1, A8-1 to A8-2, A8-2 is connected to A10-1, A10-1 to A10-2, A10-2 is connected to A12-1, A12-1 to A12-2, A12-2 is connected to A14-1, A14-1 to A14-2, A14-2 is connected to A16-1, A16-1 to A16-2, A16- 2 connects A18-1, A18-1 to A18-2, A18-2 connects A20-1, A20-1 to A20-2, A20-2 connects A22-1, A22-1 to A22-2, A22-2 connects A24-1, A24-1 to A24-2, A24-2 connects A26-1, A26-1 to A26-2, A26-2 connects A28-1 to A28-2, A28-2 connects A30-1, A30-1 to A30-2, A30-2 connects A32-1, A32-1 to A32-2.

[0114] All B-phase conductors are led out to B31-2 and B32-2, all C-phase conductors are led out to C31-2 and C32-2, A31-2 and A32-2, B31-2 and B32-2, C31-2 and C32-2 are connected at neutral point using a connector, thus completing the parallel welding of the stator winding 2 of the even-layer motor.

[0115] Embodiment 4

[0116] like Fig. 22 As shown, the stator winding 2 in this embodiment can realize the parallel connection of odd-layer motors, and the winding method of the inner coil unit is different from that of the second embodiment. In this embodiment, the pitch of the inner coil unit 21 is six, and its structure is the same as that of the outer coil unit 23 of the second embodiment. The structures of the outer coil unit 23 and the middle coil unit 22 are respectively the same as those of the outer coil unit 23 and the middle coil unit 22 of the second embodiment, and will not be described in detail here.

[0117] When the slot outer ends 213 of the odd-numbered layers of the motor are welded in parallel, the welding rule is the same as the parallel welding rule of the slot outer ends 213 of the even-numbered layers of the motor. Fig.23 As shown, the specific parallel welding process of all A-phase conductors is as follows:

[0118] The two outer ends of the incoming wire slots of the A-phase conductor of a winding are simultaneously connected by the A-phase terminal 41, and all A-phase conductors are sorted according to the welding sequence, with Aa, a=1, 2, 3, ..., 40, Aa-1 is the outer end of the incoming wire slot of a single conductor, and Aa-2 is the outer end of the outgoing wire slot of a single conductor.

[0119] Terminal A is connected to A1-1 and A2-1 at the same time, A1-1 to A1-2, A2-1 to A2-2, A1-2 to A3-1, A3-1 to A3-2, A3-2 to A5-1, A5-1 to A5-2, A5-2 to A7-1, A7-1 to A7-2, A7-2 to A9-1, A9-1 to A9-2, A9-2 to A11-1, A11-1 to A11-2, A11-2 to A13-1, A13-1 to A13-2, A13-2 to A15-1, A15-1 to A15-2, A15-2 to A17-1, A17-1 to A17-2, A17-2 to A19-1, A 19-1 to A19-2, A19-2 is connected to A21-1, A21-1 to A21-2, A21-2 is connected to A23-1, A23-1 to A23-2, A23-2 is connected to A25-1, A25-1 to A27-1, A27-1 to A27-2, A27-2 is connected to A29-1, A29-1 to A29-2, A29-2 is connected to A31-1, A31-1 to A31-2, A31-2 is connected to A33-1, A33-1 to A33-2, A33-2 is connected to A35-1, A35-1 to A37-1, A37-1 to A37-2, A37-2 is connected to A39-1, A39-1 to A39-2.

[0120] At the same time, A2-1 is connected to A2-2, A2-2 is connected to A4-1, A4-1 to A4-2, A4-2 is connected to A6-1, A6-1 to A6-2, A6-2 is connected to A8-1, A8-1 to A8-2, A8-2 is connected to A10-1, A10-1 to A10-2, A10-2 is connected to A12-1, A12-1 to A12-2, A12-2 is connected to A14-1, A14-1 to A14-2, A14-2 is connected to A16-1, A16-1 to A16-2, A16-2 is connected to A18-1, A18-1 to A18-2, A18-2 is connected to A20-1, A20-1 to A20-2, A 20-2 is connected to A22-1, A22-1 to A22-2, A22-2 is connected to A24-1, A24-1 to A24-2, A24-2 is connected to A26-1, A26-1 to A26-2, A26-2 is connected to A28-1 to A28-2, A28-2 is connected to A30-1, A30-1 to A30-2, A30-2 is connected to A32-1, A32-1 to A32-2, A32-2 is connected to A34-1, A34-1 to A34-2, A34-2 is connected to A36-1, A36-1 to A36-2, A36-2 is connected to A38-1 to A38-2, A38-2 is connected to A40-1, A40-1 to A40-2.

[0121] All B-phase conductors are led out to B39-2 and B40-2, all C-phase conductors are led out to C39-2 and C40-2, A39-2 and A40-2, B39-2 and B40-2, C39-2 and C40-2 are connected at neutral point using a connector, thus completing the parallel welding of the stator winding 2 of the odd-layer motor.

[0122] The slot outer ends of the inner coil units of the above four types of stator windings 2 are all located on the same layer as the inside of the slots, and the slot outer turning parts of the inner coil units are protruding toward the center of the stator core 1, and can be inserted into the stator winding 2 from the side where the slot outer ends are set on the stator core 1, without increasing the radial length of the teeth of the stator core 1, thereby improving the utilization rate of the slots, reducing the size of the motor, and reducing the cost of the motor; and the inner coil units are arranged on the same layer, which can improve the matching density of the motor power, avoid unnecessary waste of motor power, and improve the flexibility of matching the motor performance parameters.

[0123] The clockwise direction and counterclockwise direction mentioned in the specific implementation mode of the present invention are all with reference to the directions shown in the specific drawings. In the present invention, the number of slots per pole per phase = the number of stator slots / the number of motor poles / the number of phases, the pole pitch = the number of stator slots / the number of motor poles = the number of slots per pole per phase * the number of phases, and the number of slots is not limited to 48 slots, but can also be other numbers of slots, for example: the number of slots per pole per phase is 1, and the corresponding three-phase motor slot poles are matched with 6 poles and 18 slots, 8 poles and 24 slots, and 10 poles. 30 slots, 12 poles and 36 slots, 16 poles and 48 slots, etc., with a pole pitch of 3; the number of slots per pole per phase is 2, and the corresponding three-phase motor slot-pole combinations are 6 poles and 36 slots, 8 poles and 48 slots, 10 poles and 60 slots, 12 poles and 72 slots, 16 poles and 96 slots, etc., with a pole pitch of 6; the number of slots per pole per phase is 3, and the corresponding three-phase motor slot-pole combinations are 6 poles and 54 slots, 8 poles and 72 slots, 10 poles and 90 slots, 12 poles and 108 slots, 16 poles and 144 slots, etc., which are not limited here one by one.

[0124] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A motor stator, comprising a stator core (1), on which a plurality of slots are arranged axially through the stator core (1), and the plurality of slots are distributed along the circumference of the stator core (1); characterized in that: Also includes: The stator winding (2) comprises an inner coil unit (21) and an outer coil unit (23) which are sequentially sleeved from the inside to the outside, each of the coil units comprising a plurality of conductors, each conductor comprising two slot interiors, a slot exterior turning portion (214) connected to the two slot interiors and forming a U-shaped structure with the two slot interiors, and slot exterior end portions (213) respectively connected to the two slot interiors; Each slot is divided into M layers according to the number of slot interiors that can be accommodated in the radial direction of the stator core (1), where M is an integer greater than or equal to 2; the two slot interiors of each conductor in the inner coil unit (21) are located in the same layer, and each slot interior and the slot outer end (213) adjacent thereto are located in the same layer; It also includes an intermediate coil unit (22) disposed between the inner coil unit (21) and the outer coil unit (23), wherein the two slots of each conductor in the intermediate coil unit (22) are located in two adjacent layers; When M is an odd number, the two slots of each conductor of the outer coil unit (23) are located in two adjacent layers; when M is an even number, the two slots of each conductor of the outer coil unit (23) are located in the same layer.

2. The motor stator according to claim 1, characterized in that: The groove outer turning portion (214) comprises a first extension portion (2141), a turning portion (2142), a second extension portion (2143) and a turning portion (2144) which are connected in sequence, and the first extension portion (2141) and the turning portion (2144) are respectively connected to the inside of the two grooves; In each of the conductors of the inner coil unit (21), the first extension portion (2141) and the interior of the slot adjacent thereto are located in the same layer, the second extension portion (2143) is located on the side of the layer where the first extension portion (2141) is located that is close to the central axis of the stator core (1) / on the side away from the central axis of the stator core (1), and the turning portion (2142) and the turning portion (2144) are both partially located on the side of the layer where the first extension portion (2141) is located that is close to the central axis of the stator core (1) / on the side away from the central axis of the stator core (1), and partially located on the layer where the first extension portion (2141) is located.

3. The motor stator according to claim 2, characterized in that: In each of the conductors of the intermediate coil unit (22), the first extension portion (2141) and the second extension portion (2143) are both located on the same layer as the interior of the slot adjacent thereto, the turning portion (2144) and the second extension portion (2143) are located on the same layer, and the turning portion (2142) is partially located on the layer where the first extension portion (2141) is located, and partially located on the layer where the second extension portion (2143) is located.

4. The motor stator according to claim 2, characterized in that: When M is an even number, in each conductor of the outer coil unit (23), the first extension portion (2141) and the interior of the slot adjacent thereto are located on the same layer, the second extension portion (2143) is located on a side of the layer where the first extension portion (2141) is located, away from the central axis of the stator core (1), and the turning portion (2142) and the turning portion (2144) are both partially located on the same layer as the first extension portion (2141), and partially located on a side of the layer where the first extension portion (2141) is located, away from the central axis of the stator core (1).

5. The motor stator according to claim 2, characterized in that: When M is an odd number, in each conductor of the outer coil unit (23), the first extension portion (2141) and the second extension portion (2143) are both located on the same layer as the interior of the slot adjacent thereto, the turning portion (2144) and the second extension portion (2143) are located on the same layer, and the turning portion (2142) is partially located on the layer where the first extension portion (2141) is located, and partially located on the layer where the second extension portion (2143) is located.

6. The motor stator according to claim 2, characterized in that: For the coil units located in the same layer inside the two slots of each conductor, the projections of each turning portion and the second extension portion connected thereto on the axial section of the stator core (1) perpendicular to the second extension portion are located on the same straight line.

7. The motor stator according to any one of claims 1 to 6, characterized in that: The two outer ends of each conductor are respectively the outer end of the incoming line slot and the outer end of the outgoing line slot; For conductors of the same phase, multiple conductors are connected in sequence and the outer end of the outlet slot of one conductor and the outer end of the inlet slot of the other conductor of two conductors adjacent to each other in the connection direction are welded, the outer end of the inlet slot located at the outermost side in the connection direction is connected to the phase terminal, and the outer end of the outlet slot located at the outermost side in the connection direction is the neutral point of the phase, and except for the neutral point and the outer end of the inlet slot connected to the phase terminal, each of the other outer slot ends (213) is welded to the outer slot end (213) of another conductor located in the same radial direction and adjacent to it and located at a different layer from the outer slot end (213).

8. The motor stator according to any one of claims 1 to 6, characterized in that: Each of the coil units comprises a plurality of phase windings, at least two adjacently arranged conductors form a group of phase conductors, which are respectively a first welding conductor, ..., an i-th welding conductor, ..., an N-th welding conductor, N≥i≥1, N≥2, each of the phase windings comprises three groups of phase conductors; the two slot outer ends of each welding conductor are respectively an inlet slot outer end and an outlet slot outer end; For conductors of the same phase, the outer ends of the inlet slots of each group of the first welding conductor to the Nth welding conductor are connected in sequence, and the outer ends of the outlet slots of one conductor and the outer ends of the inlet slots of the other conductor of two conductors adjacent to each other along the connection direction are welded, the outer ends of the inlet slots of the first welding conductor to the Nth welding conductor located on the outermost sides in the connection direction are connected to the same phase terminal, and the outer ends of the outlet slots of the first welding conductor to the Nth welding conductor located on the outermost sides in the connection direction are the neutral points of the phase, and except for the neutral point and the outer ends of the inlet slots connected to the phase terminal, each of the other outer slot ends (213) is welded to the outer slot end (213) of another conductor located in the same radial direction and adjacent to it and located in a different layer from the outer slot end (213).

9. A motor, characterized in that: The motor stator comprises the motor stator as claimed in any one of claims 1 to 8.

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