Stator and motor

Abstract

The present invention relates to the field of motor technology, and discloses a stator and a motor, wherein the stator comprises: a stator core, comprising a plurality of stator slots; a three-phase stator winding, which is a short-distance winding and comprises a plurality of hairpin wires, the portion of the hairpin wire inserted into the stator slot is a slot conductor segment, and a plurality of parallel branches are formed in each phase winding; for any slot conductor segment, there is another slot conductor segment corresponding thereto, so that the two slot conductor segments have the same position relative to the rotor magnetic pole and are located in different parallel branches of the same-phase winding; at least a first threading area and a second threading area arranged along the radial partition are formed in at least part of the stator slots, and the slot conductor segments in the first threading area and the second threading area are out of phase with each other; and insulating paper, at least padded in the boundary area between the first threading area and the second threading area to isolate the slot conductor segments that are out of phase with each other. By adopting the stator of the present invention, it is beneficial to ensure the slot full rate and improve the efficiency and performance of the motor.

Description

Technical Field

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

[0002] At present, the new energy vehicle industry mostly uses motors with 8 layers of hairpin wires. When the three-phase stator winding is a short-distance winding, hairpin wires with different phases will be inserted into the same stator slot. To ensure the reliability of the motor, insulating paper needs to be placed between the hairpin wires with different phases in the same slot.

[0003] Reference Figure 4 If any adjacent hairpin wires in the slot are out of phase with each other, they need to be separated by S-type or B-type insulating paper. However, too much insulating paper will cause the slot fill rate to decrease, seriously affecting the motor performance. Therefore, when designing stator windings with multiple layers of hairpin wires, full-pitch windings are generally used to avoid the situation of different phases in the same slot. At this time, O-type insulating paper can be used to ensure a higher slot fill rate. However, the use of full-pitch winding arrangement will have an adverse effect on motor performance in other aspects, such as the deterioration of the sinusoidality of the back electromotive force waveform and the deterioration of the sinusoidality of the air gap magnetic flux waveform generated by the stator winding.

[0004] In summary, the existing motors cannot simultaneously meet the motor performance requirements such as slot fill factor, sinusoidal property of back electromotive force waveform and sinusoidal property of air gap flux density waveform generated by stator winding. Summary of the invention

[0005] In view of the above-mentioned defects or shortcomings of the prior art, the present invention provides a stator and a motor, which can reduce the number of hairpin wires in the same slot with different phases and arranged adjacent to each other and avoid the generation of circulating current between multiple parallel branches of each phase winding, so as to ensure the slot fill rate and improve the efficiency and performance of the motor.

[0006] To achieve the above object, the present invention provides a stator in a first aspect, the stator comprising:

[0007] A stator core including a plurality of stator slots;

[0008] The three-phase stator winding is a short-distance winding and includes a plurality of hairpin conductors, the portion of the hairpin conductors that penetrates into the stator slots is the in-slot conductor segment, and a plurality of parallel branches are formed in each phase winding;

[0009] For any one of the in-slot conductor segments, there is another in-slot conductor segment corresponding to it, so that the two in-slot conductor segments have the same position relative to the rotor poles and are located in different parallel branches of the same-phase winding;

[0010] A first threading area and a second threading area arranged in a radial direction are formed in at least part of the stator slots, and the conductor segments in the first threading area and the second threading area are out of phase with each other; and

[0011] Insulating paper is at least arranged in a boundary area between the first threading area and the second threading area to isolate the conductor segments in the slots that are out of phase with each other.

[0012] Optionally, the multiple in-slot conductor segments in each of the stator slots are arranged layer by layer in the radial direction. For any in-slot conductor segment in any stator slot, there is a corresponding in-slot conductor segment located in another stator slot, so that the positions of the two stator slots relative to the rotor poles are the same, and the two in-slot conductor segments are located in the same number of slot layers and are located in different parallel branches of the same-phase winding, and the in-slot conductor segments in the first threading area and the second threading area are covered with double O-shaped insulating paper.

[0013] Optionally, the hairpin conductors include a first type of hairpin conductor and a second type of hairpin conductor with different spans, and the in-slot conductor segments of the first type of hairpin conductor and the second type of hairpin conductor inserted into the stator slots are respectively the first type of in-slot conductor segments and the second type of in-slot conductor segments, and in each of the stator slots, the in-slot conductor segments located in odd-numbered layers and even-numbered layers include both the first type of in-slot conductor segments and the second type of in-slot conductor segments.

[0014] Optionally, the number of the stator slots is 48, and each of the stator slots is penetrated by 8 layers of the in-slot conductor segments, and the stator is configured to match a motor with 8 poles.

[0015] Optionally, the span of the first type of hairpin wire is 5, and the span of the second type of hairpin wire is 7.

[0016] Optionally, two or four parallel branches are formed in each phase winding of the three-phase stator winding.

[0017] Optionally, in each phase winding of the three-phase stator winding, each of the parallel branches passes through all layer positions in the stator slot.

[0018] Optionally, the hairpin conductor includes a hairpin insertion section and a hairpin welding section connected to the axial ends of the conductor section in the slot, and the winding outlet end of the three-phase stator winding is arranged on the same side of the hairpin welding section in the axial direction.

[0019] Optionally, a plurality of the hairpin conductors are welded via the hairpin welding section.

[0020] A second aspect of the present invention provides a motor, comprising the above-mentioned stator.

[0021] In the present invention, since the first threading area and the second threading area are arranged in separate areas, the in-slot conductor segments that are out of phase with each other are only arranged adjacent to each other in the boundary area of ​​the first threading area and the second threading area, and in the remaining areas of the first threading area and the second threading area, the in-slot conductor segments that are in phase with each other are in contact with each other. Therefore, it is only necessary to provide insulating paper at least in the boundary area of ​​the first threading area and the second threading area to avoid interference between in-phase conductors, and at the same time, the use of insulating paper can be reduced to ensure the slot fullness. In addition, for any in-slot conductor segment, another in-slot conductor segment with the same position relative to the rotor pole can be found in another parallel branch of the same-phase winding. Since the two in-slot conductor segments are affected in the same way by the rotor pole, there is no voltage difference between the two in-slot conductor segments, so no circulating current is generated. Overall, since the aforementioned position correspondence exists between all in-slot conductor segments, it is also possible to avoid the generation of circulating current between multiple parallel branches of each phase winding, thereby reducing the additional copper loss and drag loss of the motor and improving the motor efficiency and rated performance.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a planar development diagram of a stator in a specific embodiment of the present invention, in which each phase winding of the three-phase winding includes four parallel branches;

[0025] Figure 2 for Figure 1 A three-dimensional diagram of the stator in FIG.

[0026] Figure 3 It is a planar development diagram of another stator in a specific embodiment of the present invention, in which each phase winding of the three-phase winding includes two parallel branches;

[0027] Figure 4 The figure is a schematic diagram of a plurality of slot conductor segments arranged layer by layer along the radial direction in a single stator slot being respectively covered by S-type, B-type and O-type insulating papers in the prior art, wherein, when S-type and B-type insulating papers are used for covering, adjacent slot conductor segments belong to windings of different phases, and are distinguished by letters A and B as examples;

[0028] Figure 5It is a schematic diagram of a case where a plurality of in-slot conductor segments arranged layer by layer along the radial direction in a single stator slot are covered by double O-shaped insulating paper in a specific embodiment of the present invention. In the figure, adjacent in-slot conductor segments belong to windings of different phases, and are distinguished by letters A and B as examples, rather than being limited to phase A or phase B;

[0029] Figure 6 It is a planar development diagram of another stator in a specific embodiment of the present invention, in which each phase winding of the three-phase winding includes four parallel branches;

[0030] Figure 7 for Figure 6 Schematic diagram of the arrangement of the in-slot conductor segments between the parallel branches of the B-phase winding under every two pairs of rotor poles.

[0031] Description of reference numerals:

[0032] 1 Stator core 2 Hairpin wire

[0033] 3 Insulation paper DETAILED DESCRIPTION

[0034] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positional relationship of components with respect to the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0037] The present invention will be described in detail below in conjunction with exemplary embodiments with reference to the accompanying drawings.

[0038] A first exemplary embodiment of the present invention provides a stator, which includes a stator core and a three-phase stator winding. The stator core includes a plurality of stator slots, and the three-phase stator winding includes a plurality of hairpin wires connected between the plurality of stator slots, each hairpin wire includes a slot conductor segment inserted into the stator slot, and a hairpin insertion segment and a hairpin welding segment connected to the axial ends of the slot conductor segment, and each phase winding of the three-phase stator winding is formed with a plurality of parallel branches.

[0039] In the same phase winding, for any two slot conductor segments belonging to different parallel branches, there is theoretically no voltage difference between the two. However, in traditional motors, the positions of the two slot conductor segments relative to the rotor poles are not necessarily the same. When the relative positions are different, the two slot conductor segments will be affected differently by the magnetic field of the rotor poles, which will cause a voltage difference between the two slot conductor segments and form a circulating current between them. The existence of the circulating current will increase the additional copper loss and drag loss of the motor, reduce the motor efficiency, and seriously affect the rated performance of the motor.

[0040] Therefore, in order to solve the circulating current problem, the stator of this exemplary embodiment adopts an innovative winding method so that for any in-slot conductor segment, there is another corresponding in-slot conductor segment, and the corresponding relationship is: the positions of the two in-slot conductor segments relative to the rotor poles are the same and are located in different parallel branches of the same-phase winding.

[0041] For example, for a motor with multiple layers of hairpin wires, that is, a motor in which multiple slot conductor segments in each stator slot are arranged layer by layer along the radial direction, the same position of two slot conductor slots relative to the rotor poles specifically means: for any slot conductor segment in any stator slot, there is a corresponding slot conductor segment in another stator slot, so that the positions of the two stator slots relative to the rotor poles are the same, and the two slot conductor segments are located in the same slot layers and in different parallel branches of the same-phase winding. More specifically, in each phase winding of the three-phase stator winding, each parallel branch passes through all the layers in the stator slot.

[0042] Now combined Figure 6 and Figure 7 To explain in more detail, the stator in the figure is the stator of a 48-slot 8-pole motor, that is, the stator core 1 of the stator includes 48 stator slots, and all stator slots are numbered in sequence, and the number of rotor poles is 8 (that is, the number of pole pairs is 4). In addition, the stator includes 8 layers of hairpin wires, which are specified as the threading positions in the slots from the 1st layer to the 8th layer in the radial direction from the inside to the outside in the same stator slot. Each phase winding of the three-phase stator winding includes 4 parallel branches, and the three-phase stator winding uses two types of hairpin wires for winding, one is a hairpin wire with a span of 6, and the other is a hairpin wire with a span of 4, and both are different-layer crossovers. Different-layer crossovers mean that the two slot conductor segments in the same hairpin wire are located in different layers of slot threading positions in addition to being inserted into different stator slots. That is, the stator in the figure uses a hairpin wire with 1-7 different-layer crossovers and a hairpin wire with 1-5 different-layer crossovers. The three-phase stator winding complies with the innovative winding principle in this exemplary embodiment.

[0043] The B-phase winding is taken as an example for description. Specifically, the B-phase winding includes a branch B1, a branch B2, a branch B3 and a branch B4.

[0044] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in the branch B1 are as follows:

[0045] 2 slots 1 layer, 8 slots 2 layers, 15 slots 1 layer, 19 slots 2 layers, 26 slots 1 layer, 32 slots 2 layers, 39 slots 1 layer, 43 slots 2 layers, 2 slots 3 layers, 8 slots 4 layers, 15 slots 3 layers, 19 slots 4 layers, 26 slots 3 layers, 32 slots 4 layers, 39 slots 3 layers, 43 slots 4 layers, 2 slots 5 layers, 8 slots 6 layers, 15 slots 5 layers, 19 slots 6 layers, 26 slots 5 layers, 32 slots 6 layers, 39 slots 5 layers, 43 slots 6 layers, 2 slots 7 layers, 8 slots 8 layers, 15 slots 7 layers, 19 slots 8 layers, 26 slots 7 layers, 32 slots 8 layers, 39 slots 7 layers, 43 slots 8 layers.

[0046] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in the branch B2 are as follows:

[0047] 3 slots 1 layer, 7 slots 2 layers, 14 slots 1 layer, 20 slots 2 layers, 27 slots 1 layer, 31 slots 2 layers, 38 slots 1 layer, 44 slots 2 layers, 3 slots 3 layers, 7 slots 4 layers, 14 slots 3 layers, 20 slots 4 layers, 27 slots 3 layers, 31 slots 4 layers, 38 slots 3 layers, 44 slots 4 layers, 3 slots 5 layers, 7 slots 6 layers, 14 slots 5 layers, 20 slots 6 layers, 27 slots 5 layers, 31 slots 6 layers, 38 slots 5 layers, 44 slots 6 layers, 3 slots 7 layers, 7 slots 8 layers, 14 slots 7 layers, 20 slots 8 layers, 27 slots 7 layers, 31 slots 8 layers, 38 slots 7 layers, 44 slots 8 layers.

[0048] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in branch B3 are as follows:

[0049] 2 slots 8 layers, 44 slots 7 layers, 37 slots 8 layers, 33 slots 7 layers, 26 slots 8 layers, 20 slots 7 layers, 13 slots 8 layers, 9 slots 7 layers, 2 slots 6 layers, 44 slots 5 layers, 37 slots 6 layers, 33 slots 5 layers, 26 slots 6 layers, 20 slots 5 layers, 13 slots 6 layers, 9 slots 5 layers, 2 slots 4 layers, 44 slots 3 layers, 37 slots 4 layers, 33 slots 3 layers, 26 slots 4 layers, 20 slots 3 layers, 13 slots 4 layers, 9 slots 3 layers, 2 slots 2 layers, 44 slots 1 layer, 37 slots 2 layers, 33 slots 1 layer, 26 slots 2 layers, 20 slots 1 layer, 13 slots 2 layers, 9 slots 1 layer.

[0050] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in branch B4 are as follows:

[0051] 1 slot 8 layers, 45 slots 7 layers, 38 slots 8 layers, 32 slots 7 layers, 25 slots 8 layers, 21 slots 7 layers, 14 slots 8 layers, 8 slots 7 layers, 1 slot 6 layers, 45 slots 5 layers, 38 slots 6 layers, 32 slots 5 layers, 25 slots 6 layers, 21 slots 5 layers, 14 slots 6 layers, 8 slots 5 layers, 1 slot 4 layers, 45 slots 3 layers, 38 slots 4 layers, 32 slots 3 layers, 25 slots 4 layers, 21 slots 3 layers, 14 slots 4 layers, 8 slots 3 layers, 1 slot 2 layers, 45 slots 1 layer, 38 slots 2 layers, 32 slots 1 layer, 25 slots 2 layers, 21 slots 1 layer, 14 slots 2 layers, 8 slots 1 layer.

[0052] It should be noted that, since the arrangement of the in-slot conductor segments between the parallel branches under each pair of rotor poles is the same, only the arrangement of the in-slot conductor segments between the parallel branches under the two pairs of rotor poles is analyzed below. For the analysis of the parallel branches of the A-phase winding and the C-phase winding, the B-phase winding can be referred to, and no specific description is given here to save space.

[0053] Specifically, in Figure 7 Under the two pairs of rotor poles shown, the in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in branch B1 are as follows:

[0054] 2 slots 1 layer, 8 slots 2 layers, 15 slots 1 layer, 19 slots 2 layers, 2 slots 3 layers, 8 slots 4 layers, 15 slots 3 layers, 19 slots 4 layers, 2 slots 5 layers, 8 slots 6 layers, 15 slots 5 layers, 19 slots 6 layers, 2 slots 7 layers, 8 slots 8 layers, 15 slots 7 layers, 19 slots 8 layers.

[0055] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in the branch B2 are as follows:

[0056] 3 slots 1 layer, 7 slots 2 layers, 14 slots 1 layer, 20 slots 2 layers, 3 slots 3 layers, 7 slots 4 layers, 14 slots 3 layers, 20 slots 4 layers, 3 slots 5 layers, 7 slots 6 layers, 14 slots 5 layers, 20 slots 6 layers, 3 slots 7 layers, 7 slots 8 layers, 14 slots 7 layers, 20 slots 8 layers.

[0057] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in branch B3 are as follows:

[0058] 2 slots 8 layers, 20 slots 7 layers, 13 slots 8 layers, 9 slots 7 layers, 2 slots 6 layers, 20 slots 5 layers, 13 slots 6 layers, 9 slots 5 layers, 2 slots 4 layers, 20 slots 3 layers, 13 slots 4 layers, 9 slots 3 layers, 2 slots 2 layers, 20 slots 1 layer, 13 slots 2 layers, 9 slots 1 layer.

[0059] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in branch B4 are as follows:

[0060] 1 slot 8 layers, 21 slots 7 layers, 14 slots 8 layers, 8 slots 7 layers, 1 slot 6 layers, 21 slots 5 layers, 14 slots 6 layers, 8 slots 5 layers, 1 slot 4 layers, 21 slots 3 layers, 14 slots 4 layers, 8 slots 3 layers, 1 slot 2 layers, 21 slots 1 layer, 14 slots 2 layers, 8 slots 1 layer.

[0061] It can be seen that in Figure 7 Under the two pairs of rotor poles shown, for any in-slot conductor segment in any stator slot, there is a corresponding in-slot conductor segment located in another stator slot, so that the positions of the two stator slots relative to the rotor poles are the same, and the number of slot layers in which the two in-slot conductor segments are located is the same and they are located in different parallel branches of the B-phase winding. For example, the in-slot conductor segment of branch B4 is inserted into slot 1 and 8 layers, and correspondingly, the in-slot conductor segment of branch B2 is inserted into slot 7 and 8 layers, the in-slot conductor segment of branch B3 is inserted into slot 13 and 8 layers, and the in-slot conductor segment of branch B1 is inserted into slot 19 and 8 layers. It can be seen that the positions of slot 1, slot 7, slot 13 and slot 19 relative to the rotor pole (N pole or S pole) are the same, and the four in-slot conductor segments are all located at the threading position in the slot of the 8th layer, so they are affected in the same way by the magnetic field of the rotor poles, so that no circulating current is generated between the four in-slot conductor segments. Since the conductor segments in the slots at other positions also have similar corresponding relationships, generally speaking, no circulating current will be generated between the four parallel branches of the B-phase winding.

[0062] In one embodiment, referring to Figure 5 , at least part of the stator slots are formed with a first threading area and a second threading area arranged in radial partitions, and the in-slot conductor segments inserted into the first threading area and the second threading area are out of phase with each other. That is, the in-slot conductor segments inserted into different threading areas are located in windings of different phases, while the in-slot conductor segments inserted into the same threading area are all located in the same phase winding. With such a configuration, the in-slot conductor segments that are out of phase with each other will only be located in the boundary area between the first threading area and the second threading area. Therefore, when padding the insulating paper 3, it is only necessary to at least pad it in the boundary area to isolate the in-slot conductor segments that are out of phase with each other, thereby avoiding interference between out-of-phase conductors, and at the same time reducing the use of insulating paper 3 to ensure the slot full rate.

[0063] For a motor with multiple layers of hairpin wires, that is, a motor in which multiple in-slot wire segments in each stator slot are arranged layer by layer along the radial direction, the double O-shaped insulating paper 3 shown in the figure can be used to cover the first threading area and the second threading area. In this case, the insulating paper 3 surrounds the edges of the first threading area and the second threading area, and no insulating paper is required between the in-slot wire segments in the same threading area.

[0064] As can be seen from the foregoing, the three-phase stator winding can be wound using only two types of hairpin wires, specifically, using the first type of hairpin wires and the second type of hairpin wires with different spans. Among them, the in-slot conductor segment of the first type of hairpin wire inserted into the stator slot is the first type of in-slot conductor segment, and the in-slot conductor segment of the second type of hairpin wire inserted into the stator slot is the second type of in-slot conductor segment.

[0065] When the stator slot of the motor with multiple layers of hairpin wires is provided with a first threading area and a second threading area for partition threading, the winding principle can be further refined. Specifically, when winding, in each stator slot, the wire segments in the slots located in the odd-numbered layers and the even-numbered layers include the first type of wire segments in the slots and the second type of wire segments in the slots. That is, in the same stator slot, the first type of wire segments in the slots and the second type of wire segments in the slots are inserted at the same time, and the first type of wire segments in the slots are inserted into the threading positions in the slots located in the odd-numbered layers and the threading positions in the slots located in the even-numbered layers, and the second type of wire segments in the slots are inserted into the threading positions in the slots located in the odd-numbered layers and the threading positions in the slots located in the even-numbered layers. The two specific embodiments listed below (4-way parallel and 2-way parallel) both comply with this winding principle.

[0066] In addition, it should be noted that the outer end of the hairpin welding section is the connection terminal of the hairpin wire. Therefore, if the winding outlet end of the three-phase stator winding is arranged on the same side of the hairpin insertion section (i.e., the winding outlet end and the hairpin welding section are arranged on opposite sides of the axial direction), the winding outlet end and the hairpin welding section need to be connected through an additional special-shaped wire, thereby making the winding structure of the three-phase stator winding more complicated. Therefore, preferably, in this exemplary embodiment, the winding outlet end of the three-phase stator winding is arranged on the same side of the axial direction of the hairpin welding section to simplify the winding structure, which is conducive to increasing the winding speed and improving production efficiency.

[0067] Reference Figure 1 and Figure 2 In the embodiment shown, the stator is a stator in a 48-slot 8-pole motor, that is, the stator core 1 of the stator includes 48 stator slots, and all stator slots are numbered in sequence, and the number of rotor poles is 8 (that is, the number of pole pairs is 4). In addition, the stator includes 8 layers of hairpin wires 2, and the threading positions in the same stator slot are specified to be the 1st to 8th layers in the radial direction from the inside to the outside. Each phase winding of the three-phase stator winding includes 4 parallel branches, and the three-phase stator winding only uses two types of hairpin wires 2 for winding, with spans of 7 and 5 respectively, both of which use a different-layer cross-wire method and comply with the innovative winding winding principle in this exemplary embodiment. The winding outlet end of the three-phase stator winding is arranged on the same side of the hairpin welding section in the axial direction. Furthermore, double O-shaped insulating paper 3 is provided in the stator slot to separate the first threading area and the second threading area. In each stator slot, the in-slot conductor segments located in the odd-numbered layers and the even-numbered layers include in-slot conductor segments of hairpin conductors 2 with a span of 7 and in-slot conductor segments of hairpin conductors 2 with a span of 5.

[0068] The winding method of the winding in this embodiment can also achieve the purpose of eliminating the circulating current between parallel branches. The analysis method can be referred to above and will not be repeated here. The specific routing sequence of the B-phase winding is listed below, where the B-phase winding includes branch B1, branch B2, branch B3 and branch B4.

[0069] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in the branch B1 are as follows:

[0070] 3 slots 1 layer, 44 slots 2 layers, 38 slots 1 layer, 33 slots 2 layers, 27 slots 1 layer, 20 slots 2 layers, 14 slots 1 layer, 9 slots 2 layers, 3 slots 3 layers, 44 slots 4 layers, 38 slots 3 layers, 33 slots 4 layers, 27 slots 3 layers, 20 slots 4 layers, 14 slots 3 layers, 9 slots 4 layers, 2 slots 5 layers, 43 slots 6 layers, 37 slots 5 layers, 32 slots 6 layers, 26 slots 5 layers, 19 slots 6 layers, 13 slots 5 layers, 8 slots 6 layers, 2 slots 7 layers, 43 slots 8 layers, 37 slots 7 layers, 32 slots 8 layers, 26 slots 7 layers, 19 slots 8 layers, 13 slots 7 layers, 8 slots 8 layers.

[0071] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in the branch B2 are as follows:

[0072] 1 slot 8 layers, 8 slots 7 layers, 14 slots 8 layers, 19 slots 7 layers, 25 slots 8 layers, 32 slots 7 layers, 38 slots 8 layers, 43 slots 7 layers, 1 slot 6 layers, 8 slots 5 layers, 14 slots 6 layers, 19 slots 5 layers, 25 slots 6 layers, 32 slots 5 layers, 38 slots 6 layers, 43 slots 5 layers, 2 slots 4 layers, 9 slots 3 layers, 15 slots 4 layers, 20 slots 3 layers, 26 slots 4 layers, 33 slots 3 layers, 39 slots 4 layers, 44 slots 3 layers, 2 slots 2 layers, 9 slots 1 layer, 15 slots 2 layers, 20 slots 1 layer, 26 slots 2 layers, 33 slots 1 layer, 39 slots 2 layers, 44 slots 1 layer.

[0073] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in branch B3 are as follows:

[0074] 2 slots 1 layer, 45 slots 2 layers, 39 slots 1 layer, 32 slots 2 layers, 26 slots 1 layer, 21 slots 2 layers, 15 slots 1 layer, 8 slots 2 layers, 2 slots 3 layers, 45 slots 4 layers, 39 slots 3 layers, 32 slots 4 layers, 26 slots 3 layers, 21 slots 4 layers, 15 slots 3 layers, 8 slots 4 layers, 1 slot 5 layers, 44 slots 6 layers, 38 slots 5 layers, 31 slots 6 layers, 25 slots 5 layers, 20 slots 6 layers, 14 slots 5 layers, 7 slots 6 layers, 1 slot 7 layers, 44 slots 8 layers, 38 slots 7 layers, 31 slots 8 layers, 25 slots 7 layers, 20 slots 8 layers, 14 slots 7 layers, 7 slots 8 layers.

[0075] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in branch B4 are as follows:

[0076] 2 slots 8 layers, 7 slots 7 layers, 13 slots 8 layers, 20 slots 7 layers, 26 slots 8 layers, 31 slots 7 layers, 37 slots 8 layers, 44 slots 7 layers, 2 slots 6 layers, 7 slots 5 layers, 13 slots 6 layers, 20 slots 5 layers, 26 slots 6 layers, 31 slots 5 layers, 37 slots 6 layers, 44 slots 5 layers, 3 slots 4 layers, 8 slots 3 layers, 14 slots 4 layers, 21 slots 3 layers, 27 slots 4 layers, 32 slots 3 layers, 38 slots 4 layers, 45 slots 3 layers, 3 slots 2 layers, 8 slots 1 layer, 14 slots 2 layers, 21 slots 1 layer, 27 slots 2 layers, 32 slots 1 layer, 38 slots 2 layers, 45 slots 1 layer.

[0077] Reference Figure 3 In the embodiment shown, the stator is a stator in a 48-slot 8-pole motor, that is, the stator core 1 of the stator includes 48 stator slots, and all stator slots are numbered in sequence, and the number of rotor poles is 8 (that is, the number of pole pairs is 4). In addition, the stator includes 8 layers of hairpin wires 2, and the threading positions in the same stator slot are specified to be the 1st to 8th layers in the radial direction from the inside to the outside. Each phase winding of the three-phase stator winding includes 2 parallel branches, and the three-phase stator winding only uses two types of hairpin wires 2 for winding, with spans of 7 and 5 respectively, both of which use a different-layer cross-wire method and comply with the innovative winding winding principle in this exemplary embodiment. The winding outlet end of the three-phase stator winding is arranged on the same side of the hairpin welding section in the axial direction. Furthermore, double O-shaped insulating paper 3 is provided in the stator slot to separate the first threading area and the second threading area. In each stator slot, the in-slot conductor segments located in the odd-numbered layers and the even-numbered layers include in-slot conductor segments of hairpin conductors 2 with a span of 7 and in-slot conductor segments of hairpin conductors 2 with a span of 5.

[0078] The winding method of the winding in this embodiment can also achieve the purpose of eliminating the circulating current between parallel branches. The analysis method can be referred to above and will not be repeated here. The specific routing sequence of the B-phase winding is listed below, where the B-phase winding includes branch B1 and branch B2.

[0079] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in the branch B1 are as follows:

[0080] 3 slots 1 layer, 44 slots 2 layers, 38 slots 1 layer, 33 slots 2 layers, 27 slots 1 layer, 20 slots 2 layers, 14 slots 1 layer, 9 slots 2 layers, 2 slots 1 layer, 45 slots 2 layers, 39 slots 1 layer, 32 slots 2 layers, 26 slots 1 layer, 21 slots 2 layers, 15 slots 1 layer, 8 slots 2 layers, 2 slots 3 layers, 45 slots 4 layers, 39 slots 3 layers, 32 slots 4 layers, 26 slots 3 layers, 21 slots 4 layers, 15 slots 3 layers, 8 slots 4 layers, 3 slots 3 layers, 44 slots 4 layers, 38 slots 3 layers, 33 slots 4 layers, 27 slots 3 layers, 20 slots 4 layers, 14 slots 3 layers, 9 slots 4 layers, 2 slots 5 layers, 43 slots 6 layers, 37 slots 5 layers, 32 slots 6 layers, 26 slots 5 layers, 19 slots 6 layers, 13 slots 5 layers, 8 slots 6 layers, 1 slot 5 layers, 44 slots 6 layers, 38 slots 5 layers, 31 slots 6 layers, 25 slots 5 layers, 20 slots 6 layers, 14 slots 5 layers, 7 slots 6 layers, 1 slot 7 layers, 44 slots 8 layers, 38 slots 7 layers, 31 slots 8 layers, 25 slots 7 layers, 20 slots 8 layers, 14 slots 7 layers, 7 slots 8 layers, 2 slots 7 layers, 43 slots 8 layers, 37 slots 7 layers, 32 slots 8 layers, 26 slots 7 layers, 19 slots 8 layers, 13 slots 7 layers, 8 slots 8 layers.

[0081] The in-slot threading positions of the multiple in-slot conductor segments corresponding to the multiple hairpin conductors in the branch B2 are as follows:

[0082] 1 slot 8 layers, 8 slots 7 layers, 14 slots 8 layers, 19 slots 7 layers, 25 slots 8 layers, 32 slots 7 layers, 38 slots 8 layers, 43 slots 7 layers, 2 slots 8 layers, 7 slots 7 layers, 13 slots 8 layers, 20 slots 7 layers, 26 slots 8 layers, 31 slots 7 layers, 37 slots 8 layers, 44 slots 7 layers, 2 slots 6 layers, 7 slots 5 layers, 13 slots 6 layers, 20 slots 5 layers, 26 slots 6 layers, 31 slots 5 layers, 37 slots 6 layers, 44 slots 5 layers, 1 slot 6 layers, 8 slots 5 layers, 14 slots 6 layers, 19 slots 5 layers, 25 slots 6 layers, 32 slots 5 layers, 38 slots 6 layers, 43 slots 5 layers, 2 slots 4 layers, 9 slots 3 layers, 15 slots 4 layers, 20 slots 3 layers, 26 slots 4 layers, 33 slots 3 layers, 39 slots 4 layers, 44 slots 3 layers, 3 slots 4 layers, 8 slots 3 layers, 14 slots 4 layers, 21 slots 3 layers, 27 slots 4 layers, 32 slots 3 layers, 38 slots 4 layers, 45 slots 3 layers, 3 slots 2 layers, 8 slots 1 layer, 14 slots 2 layers, 21 slots 1 layer, 27 slots 2 layers, 32 slots 1 layer, 38 slots 2 layers, 45 slots 1 layer, 2 slots 2 layers, 9 slots 1 layer, 15 slots 2 layers, 20 slots 1 layer, 26 slots 2 layers, 33 slots 1 layer, 39 slots 2 layers, 44 slots 1 layer.

[0083] The above-mentioned 4-way parallel or 2-way parallel three-phase stator winding can effectively avoid the generation of circulating current between parallel branches, thereby reducing the additional copper loss and drag loss of the motor, improving the motor efficiency and rated performance, and because of the use of short-distance winding arrangement, the back electromotive force waveform of the motor can be guaranteed to have good sinusoidal properties. In addition, by arranging the first threading area and the second threading area in radial partitions in the stator slot, the interference of out-of-phase wires can be effectively avoided, the use of insulating paper can be reduced, the risk of short circuit between turns can be reduced, and the slot fill rate can be improved. And in the above-mentioned 4-way parallel or 2-way parallel three-phase stator winding, multiple hairpin wires 2 are directly welded through the hairpin welding section without the need for additional other wires, so there will be no extra wires superimposed on the end of the hairpin wire, so that the height of the stator end can be reduced.

[0084] A second exemplary embodiment of the present invention provides a motor, which includes the above-mentioned stator, and thus has all the technical effects brought by the above-mentioned stator, so they are not repeated here.

[0085] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0086] It should also be noted that the various specific technical features described in the above specific implementation methods can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will no longer separately describe various possible combinations.

[0087] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A stator, characterized in that: The stator comprises: A stator core (1) comprising a plurality of stator slots; The three-phase stator winding is a short-distance winding and includes a plurality of hairpin conductors (2), the portion of the hairpin conductors (2) that penetrates into the stator slots is an in-slot conductor segment, and a plurality of parallel branches are formed in each phase winding; For any one of the in-slot conductor segments, there is another in-slot conductor segment corresponding to it, so that the two in-slot conductor segments have the same position relative to the rotor poles and are located in different parallel branches of the same-phase winding; A first threading area and a second threading area arranged in a radial direction are formed in at least part of the stator slots, and the conductor segments in the first threading area and the second threading area are out of phase with each other; and Insulating paper (3) is at least padded in the boundary area between the first threading area and the second threading area to isolate the conductor segments in the slots that are out of phase with each other.

2. The stator according to claim 1, characterized in that: The plurality of in-slot conductor segments in each of the stator slots are arranged layer by layer along the radial direction. For any in-slot conductor segment in any stator slot, there is a corresponding in-slot conductor segment located in another stator slot, so that the positions of the two stator slots relative to the rotor magnetic poles are the same, and the two in-slot conductor segments are located in the same number of slot layers and are located in different parallel branches of the same-phase winding. The in-slot conductor segments in the first threading area and the second threading area are covered by double O-shaped insulating paper (3).

3. The stator according to claim 2, characterized in that: The hairpin conductors (2) include a first type of hairpin conductors and a second type of hairpin conductors with different spans, the in-slot conductor segments of the first type of hairpin conductors and the second type of hairpin conductors inserted into the stator slots are respectively the first type of in-slot conductor segments and the second type of in-slot conductor segments, and in each of the stator slots, the in-slot conductor segments located in odd-numbered layers and even-numbered layers include both the first type of in-slot conductor segments and the second type of in-slot conductor segments.

4. The stator according to claim 3, characterized in that: The number of the stator slots is 48, and each of the stator slots has 8 layers of in-slot conductor segments inserted therein. The stator is configured to match a motor with 8 poles.

5. The stator according to claim 4, characterized in that: The span of the first type of hairpin wire is 5, and the span of the second type of hairpin wire is 7.

6. The stator according to claim 5, characterized in that: Two or four parallel branches are formed in each phase winding of the three-phase stator winding.

7. The stator according to claim 2, characterized in that: In each phase winding of the three-phase stator winding, each of the parallel branches passes through all layer positions in the stator slot.

8. The stator according to claim 1, characterized in that: The hairpin conductor (2) comprises a hairpin insertion section and a hairpin welding section connected to the axial ends of the conductor section in the slot, and the winding outlet end of the three-phase stator winding is arranged on the same side of the hairpin welding section in the axial direction.

9. The stator according to claim 1, characterized in that: A plurality of the hairpin conductors (2) are welded together via the hairpin welding sections.

10. A motor, characterized in that: The electric motor comprises a stator according to any one of claims 1 to 9.

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