Flat wire motor stator and motor

Abstract

The utility model discloses a flat wire motor stator, including stator core and stator winding, in the inside wall of stator core along the circumferential even distribution has a plurality of stator slot, every stator slot all along the radial setting of stator core has N slot layer, the utility model discloses can through to each branch's hairpin wire and carry out the even balance of quantity and the wiring of pole pitch balance, reduce the voltage difference existing between branch, thereby reduce the circulation production probability, avoid the influence that motor operating efficiency received.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a flat wire motor stator and motor. Background Technology

[0002] New energy vehicles are beginning to come into the public eye. Among them, flat wire motors, as a type of new energy motor, are increasingly being used in new energy vehicles due to their advantages such as high efficiency, good heat dissipation, and good vibration resistance.

[0003] In flat wire motors, the copper wires in the stator windings are formed into flat wires. Flat wires are beneficial to improving the slot fill factor of the motor. The improvement of the slot fill factor means that more copper can be filled without changing the space, which reduces the resistance of the motor.

[0004] In existing technologies, flat-wire motors mainly employ wave-wound or multi-layered winding structures. By designing the flat wires in the winding structure into a multi-layered structure, the AC resistance of the motor can be effectively reduced. However, as the number of flat wires increases, the wiring method of the winding structure also changes, which limits the motor's application, as follows:

[0005] First, in a multi-parallel circuit configuration, due to the different relative positions of the hairpin wires to the magnets between the branches, a voltage difference exists between the branches under the influence of the magnetic field generated by the magnetic poles, thus forming a circulating current. This circulating current affects motor efficiency and reduces the overall vehicle range.

[0006] Secondly, copper wires have various span types, complex layout methods, and high mold investment costs.

[0007] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0008] This utility model provides a flat wire motor stator and motor, aiming to solve the technical problems mentioned in the background art.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a flat wire motor stator, comprising a stator core and a stator winding; multiple stator slots are evenly distributed circumferentially on the inner sidewall of the stator core, and each stator slot has N slot layers arranged radially along the stator core, the slot layers being configured for wiring of the stator winding; the flat wire motor stator is used for a flat wire motor with Z stator slots and P pole pairs; the stator winding includes multi-phase windings, each phase winding including multiple parallel branches, each branch being composed of multiple hairpin wires with different pitches y connected in series; the hairpin wires include two pitches y; the first is y1, y1=τ (pole pitch)=Z / 2P; the second is y2, y2 being one of y2=τ-1, y2=τ+1, y2=τ+2.

[0010] In the above scheme, the voltage difference between branches can be reduced by balancing the number and spacing of the hairpin wires in each branch, thereby reducing the probability of circulating current and avoiding affecting the motor's working efficiency.

[0011] A further technical solution is that the multi-phase winding includes a U-phase winding, a V-phase winding, and a W-phase winding; the U-phase winding is obtained by rotating the stator core axis as a reference and deflecting it by 360° / (2Pm)×2 angles in a first direction; the V-phase winding is obtained by rotating the stator core axis as a reference and deflecting it by 360° / (2Pm)×2 angles in a first direction; P is the number of pole pairs, m is the number of phases, and the number of phases is 3.

[0012] With the above design, after the position of the U-phase winding is determined, the V-phase winding can be obtained by simply deflecting it by 360° / (2Pm)×2. Then, the V-phase winding can be deflected by 360° / (2Pm)×2 to obtain the W-phase winding. This can improve wiring efficiency and eliminate the need to frequently consider the copper wire span during wiring.

[0013] It should be noted that the first direction in this application is counterclockwise.

[0014] A further technical solution includes three types of hairpin wires, namely lead-out wires, first hairpin wires, and second hairpin wires; the number of slot layers N is 8, and the directions of the 8 slot layers from the slot opening to the slot bottom are a, b, c, d, e, f, g, and h respectively; wherein, the first hairpin wire is only set in the h layer; and the lead-out wire is only set in the a layer.

[0015] With the above design, the positions of the first hairpin wire and the lead wire can be quickly determined, allowing the operator to determine the position of the second hairpin wire simply by considering its span within the stator slot. This further improves wiring efficiency.

[0016] A further technical solution is provided, wherein the number of phases in the multi-phase winding is m, the number of branches is k, the total number of lead-out wires is 2km, the total number of first hairpin wires is km, the number of hairpin wires is L, L=(Z*N-2*k*m) / 2+2km, the number of lead-out wires in each phase winding is 2k, and the number of first hairpin wires in each phase winding is k.

[0017] With the above design, the number of lead wires, first hairpin wires and second hairpin wires can be quickly determined, thereby enabling operators to further improve wiring efficiency during wiring.

[0018] A further technical solution includes a first connecting segment, a first bent segment, a second bent segment, and a first straight segment and a second straight segment configured to be embedded in two stator slots respectively; the first straight segment and the second straight segment are parallel and spaced apart, with one end of the first straight segment and the second straight segment respectively positioned and connected to both ends of the first connecting segment, and the other end of the first straight segment and the second straight segment respectively positioned and connected to the first bent segment and the second bent segment; both the first bent segment and the second bent segment extend to the outside of the stator slot and bend circumferentially along the stator core, with the bending directions being the same; the pitch y1 of the first straight segment and the second straight segment in the stator slot is equal to the pole pitch τ, y1=τ=Z / 2P.

[0019] In the above scheme, both the first and second bending sections exist as welding ends.

[0020] Specifically, since the first hairpin wire is only set in layer h, and the number of first hairpin wires in each phase winding is y, the number of first hairpin wires in each branch of the phase winding is y / m, that is, 3 divided by 3 equals 1. The two ends of this first hairpin wire are respectively connected to the third bend and the fourth bend of the adjacent second hairpin wire.

[0021] A further technical solution includes a second connecting segment, a third bent segment, a fourth bent segment, and a third straight segment and a fourth straight segment configured to be embedded in two stator slots respectively; the third straight segment and the fourth straight segment are parallel and spaced apart, with the same end of the third straight segment and the fourth straight segment respectively positioned and connected to the two ends of the second connecting segment, and the same other end of the third straight segment and the fourth straight segment respectively connected to the third bent segment and the fourth bent segment; both the third bent segment and the fourth bent segment extend to the outside of the stator slot and bend along the circumference of the stator core, with opposite bending directions; the span of the third straight segment and the fourth straight segment in the stator slot is equal to the pitch y2, where y2 is one of y2=τ-1, y2=τ+1, or y2=τ+2.

[0022] In the above scheme, the first and second bending sections are both welded ends, and the first and second bending sections are located at the same end of the stator core as the third and fourth bending sections.

[0023] In a further technical solution, the lead wire includes a lead section, a fifth bent section, and a fifth straight section configured to be embedded in the stator slot and extending along the axial direction of the stator core; the lead section, the fifth straight section, and the fifth bent section are connected in sequence, and the fifth bent section extends to the outside of the stator slot and bends along the circumference of the stator core.

[0024] In the above scheme, the lead-out conductor is only set in layer a, and its fifth bend section is set at the same end of the stator core along with the first bend section and the second bend section, but the lead-out section is located at the other end of the stator core.

[0025] When welding the lead wire, the first hairpin wire, and the second hairpin wire, the welding end is at the lower end of the stator core, and the lead section is at the upper end of the stator core. This way, the operator only needs to focus on the lower end of the stator core for welding operations.

[0026] A further technical solution is that the multi-phase winding includes a U-phase winding, a V-phase winding, and a W-phase winding; taking the U-phase winding as a reference, the U-phase winding includes a first branch, a second branch, and a third branch connected in parallel; the lead wires in the first branch, the second branch, and the third branch are all connected to the same wire to achieve parallel connection; in the first branch, there are 25 hairpin wires, 2 lead wires, 1 first hairpin wire, and 22 second hairpin wires; in the first branch, the connection route of the 25 hairpin wires in the stator slots is: slot 1a layer - slot 47b layer - slot 36a layer - slot 28b layer - slot 17a layer - slot 9b layer - slot 53c layer - slot 45d layer - slot 37c layer - slot 29d layer - slot 18c layer -10 slot d layer -54 slot e layer -46 slot f layer -35 slot e layer -27 slot f layer -19 slot e layer -11 slot f layer -1 slot g layer -47 slot h layer -36 slot g layer -28 slot h layer -17 slot g layer -9 slot h layer -54 slot h layer -8 slot g layer -19 slot h layer -27 slot g layer -38 slot h layer -46 slot g layer -2 slot f layer -10 slot e layer -18 slot f layer -26 slot e layer -37 slot f layer -45 slot e layer -1 slot d layer -9 slot c layer -20 slot d layer -28 slot c layer -36 slot d layer -44 slot c layer -54 slot b layer -8 slot a layer -19 slot b layer -27 slot a layer -38 slot b layer -46 slot a layer; wherein, the first hairpin wire is only set in the h layer; the lead wire is only set in the a layer.

[0027] Since there are only two types of spans for the first and second hairpin wires in the first branch, totaling four spans, the above design can avoid circulating currents between multiple parallel branches of each phase winding, thereby improving the efficiency of the motor.

[0028] In a further technical solution, the second branch has 25 hairpin wires, 2 lead wires, 1 first hairpin wire, and 22 second hairpin wires. The connection route of the 25 hairpin wires in the stator slots of the second branch is as follows: Slot 54a layer - Slot 46b layer - Slot 35a layer - Slot 27b layer - Slot 19a layer - Slot 11b layer - Slot 1c layer - Slot 47d layer - Slot 36c layer - Slot 28d layer - Slot 17c layer - Slot 9d layer - Slot 53e layer - Slot 45f layer - Slot 37e layer - Slot 29f layer - Slot 18e layer - Slot 10f layer - Slot 54g layer - Slot 46h layer - Slot 35g layer - Slot 27h layer - Slot 19g layer - Slot 11h layer - Slot 2h layer - Slot 10g layer - Slot 18 h layer - 26 slots, g layer - 37 slots, h layer - 45 slots, g layer - 1 slot, f layer - 9 slots, e layer - 20 slots, f layer - 28 slots, e layer - 36 slots, f layer - 44 slots, e layer - 54 slots, d layer - 8 slots, c layer - 19 slots, d layer - 27 slots, c layer - 38 slots, d layer - 46 slots, c layer - 2 slots, b layer - 10 slots, a layer - 18 slots, b layer - 26 slots, a layer - 37 slots, b layer - 45 slots, a layer; wherein, the first hairpin wire is only disposed in the h layer; the lead-out wire is only disposed in the a layer.

[0029] Since the first and second hairpin wires in the second branch have only two types of spans, totaling four spans, the above design can avoid circulating currents between multiple parallel branches of each phase winding, thereby improving the efficiency of the motor.

[0030] In a further technical solution, the third branch contains 25 hairpin wires, 2 lead-out wires, 1 first hairpin wire, and 22 second hairpin wires. The connection route of the 25 hairpin wires in the stator slots of the third branch is as follows: 53 slot a layer - 45 slot b layer - 37 slot a layer - 29 slot b layer - 18 slot a layer - 10 slot b layer - 54 slot c layer - 46 slot d layer - 35 slot c layer - 27 slot d layer - 19 slot c layer - 11 slot d layer - 1 slot e layer - 47 slot f layer - 36 slot e layer - 28 slot f layer - 17 slot e layer - 9 slot f layer - 53 slot g layer - The layers are: 45 slots h layer - 37 slots g layer - 29 slots h layer - 18 slots g layer - 10 slots h layer - 1 slot h layer - 9 slots g layer - 20 slots h layer - 28 slots g layer - 36 slots h layer - 44 slots g layer - 54 slots f layer - 8 slots e layer - 19 slots f layer - 27 slots e layer - 38 slots f layer - 46 slots e layer - 2 slots d layer - 10 slots c layer - 18 slots d layer - 26 slots c layer - 37 slots d layer - 45 slots c layer - 1 slot b layer - 9 slots a layer - 20 slots b layer - 28 slots a layer - 36 slots b layer - 44 slots a layer; wherein, the first hairpin wire is only disposed in the h layer; the lead wire is only disposed in the a layer.

[0031] Since the first and second hairpin wires in the third branch have only two types of spans, totaling four spans, the above design can avoid circulating currents between multiple parallel branches of each phase winding, thereby improving the efficiency of the motor.

[0032] This utility model also includes a flat wire motor, including a flat wire motor stator.

[0033] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0034] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0035] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0036] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0037] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0038] The working principle and advantages of this utility model are as follows:

[0039] This invention reduces the voltage difference between branches by balancing the number and spacing of the hairpin wires in each branch, thereby reducing the probability of circulating current and preventing the motor's operating efficiency from being affected. Attached Figure Description

[0040] Appendix Figure 1 This is a schematic diagram of the stator core structure in an embodiment of the present utility model;

[0041] Appendix Figure 2 This is a schematic diagram of the structure when the stator winding is connected to the stator core in an embodiment of this utility model;

[0042] Appendix Figure 3 This is a schematic diagram of the stator winding structure in an embodiment of the present utility model;

[0043] Appendix Figure 4 This is a schematic diagram of the lead wire structure in an embodiment of the present utility model;

[0044] Appendix Figure 5 This is a schematic diagram of the second hairpin wire structure in an embodiment of the present invention;

[0045] Appendix Figure 6 This is a schematic diagram of the first hairpin wire structure in an embodiment of the present invention;

[0046] Appendix Figure 7 This is a schematic diagram of the groove layer structure in the stator groove of this utility model embodiment;

[0047] Appendix Figure 8 This is a schematic diagram of the connection principle of the hairpin wire on the first branch (U-phase winding) in an embodiment of this utility model.

[0048] Appendix Figure 9 This is a schematic diagram of the connection principle of the hairpin wire on the second branch (U-phase winding) in an embodiment of this utility model.

[0049] Appendix Figure 10 This is a schematic diagram of the connection principle of the hairpin wire on the third branch (U-phase winding) in an embodiment of this utility model.

[0050] In the attached diagrams: 1. Stator core; 2. Stator winding; 3. Stator slot; 4. Hairpin wire; 5. Lead-out wire; 6. First hairpin wire; 7. Second hairpin wire; 8. First connecting section; 9. First bending section; 10. Second bending section; 11. First straight section; 12. Second straight section; 13. Second connecting section; 14. Third bending section; 15. Fourth bending section; 16. Third straight section; 17. Fourth straight section; 18. Lead-out section; 19. Fifth bending section; 20. Fifth straight section. Detailed Implementation

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0052] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0053] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0054] See appendix Figures 1-10 As shown, a flat wire motor stator and motor include a stator core 1 and a stator winding 2. Multiple stator slots 3 are evenly distributed circumferentially on the inner wall of the stator core 1. Each stator slot 3 has N slot layers arranged radially along the stator core 1. The slot layers are configured for wiring of the stator winding 2. The flat wire motor stator is used for a flat wire motor with Z stator slots 3 and P pole pairs. The stator winding 2 includes multi-phase windings. Each phase winding includes multiple parallel branches, and each branch is composed of multiple hairpin wires 4 with different pitches y connected in series. The hairpin wires 4 include two pitches y: the first is y1, y1 = τ (pole pitch) = Z / 2P; the second is y2, y2 being one of y2 = τ-1, y2 = τ+1, or y2 = τ+2.

[0055] This invention reduces the voltage difference between branches by balancing the number and spacing of the hairpin wires 4 in each branch, thereby reducing the probability of circulating current and preventing the motor's working efficiency from being affected.

[0056] Preferably, the multiphase winding includes a U-phase winding, a V-phase winding, and a W-phase winding; the U-phase winding is obtained by rotating the stator core axis by 360° / (2Pm)×2 angles in a first direction to obtain the V-phase winding, and the V-phase winding is obtained by rotating the stator core axis by 360° / (2Pm)×2 angles in a first direction to obtain the W-phase winding; P is the number of pole pairs, m is the number of phases, and the number of phases is 3.

[0057] With the above design, after the position of the U-phase winding is determined, the V-phase winding can be obtained by simply deflecting it by 360° / (2Pm)×2. Then, the V-phase winding can be deflected by 360° / (2Pm)×2 to obtain the W-phase winding. This can improve wiring efficiency and eliminate the need to frequently consider the copper wire span during wiring.

[0058] It should be noted that the first direction in this application is counterclockwise.

[0059] Specifically, in this embodiment, P is 3, so the deflection angle is 40°.

[0060] Preferably, the hairpin wire 4 includes three types, namely, lead wire 5, first hairpin wire 6 and second hairpin wire 7; the number of slot layers N is 8, and the directions of the 8 slot layers from the slot opening to the slot bottom are a, b, c, d, e, f, g and h respectively; wherein, the first hairpin wire 6 is only provided in the h layer; the lead wire 5 is only provided in the a layer.

[0061] In the above scheme, the span refers to the number of slots spanned by the two effective sides of the first hairpin wire 6 or the second hairpin wire 7 embedded in the stator slots. That is, after the first straight segment 11 and the second straight segment 12 are respectively embedded in the two stator slots 3, the number of slots between the two stator slots 3 is as follows.

[0062] Specifically, such as Figure 7 As shown, with the above design, the positions of the first hairpin wire 6 and the lead wire 5 can be quickly determined, allowing the operator to determine the position of the second hairpin wire 7 simply by measuring its span within the stator slot 3. This further improves wiring efficiency.

[0063] Preferably, the number of phases in the multi-phase winding is m, the number of branches is k; the total number of lead-out wires 5 is 2km; the total number of first hairpin wires 6 is km; the number of hairpin wires 4 is L, L=(Z (number of slots)*N (number of layers)-2*k (number of branches)*m (number of phases)) / 2+2km; the number of lead-out wires 5 in each phase winding is 2k, and the number of first hairpin wires 6 in each phase winding is k.

[0064] With the above design, the number of lead wire 5, first hairpin wire 6 and second hairpin wire 7 can be quickly determined, thereby enabling the operator to further improve wiring efficiency during wiring.

[0065] In this embodiment, the total number of hairpin wires is (54 (number of slots) * 8 (number of layers) - 2 * 3 (number of branches) * 3 (number of phases) = 414 / 2 = 207 + 18 = 225).

[0066] There are three phases at this point. 225 divided by three equals 75 (75 phases).

[0067] Additionally, each phase has 3 branches, and each branch has 25 (of these 25, there are 2 lead wires 5 and 1 first hairpin wire 6).

[0068] That is, 25 - 3 = 22 (these 22 are the second hairpin wire 7).

[0069] Preferably, the first hairpin wire 6 includes a first connecting segment 8, a first bent segment 9, a second bent segment 10, and a first straight segment 11 and a second straight segment 12 configured to be embedded in two stator slots 3 respectively; the first straight segment 11 and the second straight segment 12 are parallel and spaced apart, and the same end of the first straight segment 11 and the second straight segment 12 are respectively positioned and connected to the two ends of the first connecting segment 8, and the same other end of the first straight segment 11 and the second straight segment 12 are respectively positioned and connected to the first bent segment 9 and the second bent segment 10; the first bent segment 9 and the second bent segment 10 both extend to the outside of the stator slot and bend along the circumference of the stator core 1, and the bending direction is the same; the span of the first straight segment 11 and the second straight segment 12 in the stator slot 3 is equal to the pitch y1, which is equal to the pole pitch τ, y1=τ=Z / 2P.

[0070] For details, please refer to Figure 3 and 6 In the above scheme, the first bending segment 9 and the second bending segment 10 both exist as welding ends.

[0071] Specifically, since the first hairpin wire 6 is only set in layer h, and the number of first hairpin wires 6 in each phase winding is y, the number of first hairpin wires 6 in each branch of the phase winding is y / m, that is, 3 divided by 3 equals 1. The two ends of this first hairpin wire 6 are respectively connected to the third bend segment 14 and the fourth bend segment 15 of the adjacent second hairpin wire 7.

[0072] Preferably, the second hairpin wire 7 includes a second connecting segment 13, a third bent segment 14, a fourth bent segment 15, and a third straight segment 16 and a fourth straight segment 17 configured to be embedded in two stator slots 3 respectively; the third straight segment 16 and the fourth straight segment 17 are parallel and spaced apart, with the same end of the third straight segment 16 and the fourth straight segment 17 respectively positioned and connected to the two ends of the second connecting segment 13, and the same other end of the third straight segment 16 and the fourth straight segment 17 respectively connected to the third bent segment 14 and the fourth bent segment 15; the third bent segment 14 and the fourth bent segment 15 both extend outside the stator slot and bend along the circumference of the stator core 1, with opposite bending directions; the span of the third straight segment 16 and the fourth straight segment 17 in the stator slot 3 is equal to the pitch y2, where y2 is one of y2=τ-1, y2=τ+1, and y2=τ+2.

[0073] In the above scheme, the first bending segment 9 and the second bending segment 10 are both present as welding ends, and the first bending segment 9 and the second bending segment 10 are located at the same end of the stator core 1 as the third bending segment 14 and the fourth bending segment 15.

[0074] Preferably, the lead wire 5 includes a lead section 18, a fifth bent section 19, and a fifth straight section 20 configured to be embedded in the stator slot 3 and extend along the axial direction of the stator core 1; the lead section 18, the fifth straight section 20, and the fifth bent section 19 are connected in sequence, and the fifth bent section 19 extends to the outside of the stator slot and bends along the circumference of the stator core 1.

[0075] In the above scheme, the lead wire 5 is only set in layer a, and its fifth bend section 19 is set at the same end of the stator core 1 along with the first bend section 9 and the second bend section 10, but the lead section 18 is located at the other end of the stator core 1.

[0076] by Figure 3 For example, when the lead wire 5, the first hairpin wire 6 and the second hairpin wire 7 are welded, the welding end is at the lower end of the stator core 1 and the lead section 18 is at the upper end of the stator core 1. In this way, the operator only needs to focus on the lower end of the stator core 1 to perform the welding operation.

[0077] Preferably, the multi-phase windings include a U-phase winding, a V-phase winding, and a W-phase winding; taking the U-phase winding as a reference, the U-phase winding includes a first branch, a second branch, and a third branch connected in parallel; the lead wires 5 in the first branch, the second branch, and the third branch are all connected to the same wire to achieve parallel connection; in the first branch, there are 25 hairpin wires 4, 2 lead wires 5, 1 first hairpin wire 6, and 22 second hairpin wires 7; in the first branch, the connection route of the 25 hairpin wires 4 in the stator slot 3 is: slot a layer - slot b layer 47 - slot a layer 36 - slot b layer 28 - slot a layer 17 - slot b layer 9 - slot c layer 53 - slot d layer 45 - slot c layer 37 - slot d layer 29 - slot c layer 18 -10 slot d layer -54 slot e layer -46 slot f layer -35 slot e layer -27 slot f layer -19 slot e layer -11 slot f layer -1 slot g layer -47 slot h layer -36 slot g layer -28 slot h layer -17 slot g layer -9 slot h layer -54 slot h layer -8 slot g layer -19 slot h layer -27 slot g layer -38 slot h layer -46 slot g layer -2 slot f layer -10 slot e layer -18 slot f layer -26 slot e layer -37 slot f layer -45 slot e layer -1 slot d layer -9 slot c layer -20 slot d layer -28 slot c layer -36 slot d layer -44 slot c layer -54 slot b layer -8 slot a layer -19 slot b layer -27 slot a layer -38 slot b layer -46 slot a layer; wherein, the first hairpin wire 6 is only disposed in the h layer; the lead wire 5 is only disposed in the a layer.

[0078] Because the first hairpin wire 6 and the second hairpin wire 7 in the first branch have few span types (specifically only two types, namely y1 and y2, where y1 is 9 and y2 is 8, 10 or 11, for a total of 4), the above design can avoid circulating current between multiple parallel branches of each phase winding, thereby improving the efficiency of the motor.

[0079] It should be noted that, with Figure 2 and Figure 3 For example, when the 25 hairpin wires 4 are connected in the stator slot 3, they are connected through the lower bending section. For instance, when the first hairpin wire 6 and the second hairpin wire 7 are connected, the 9th bend in the first hairpin wire 6 is connected to the third bending section 14 or the fourth bending section 15 in the second hairpin wire 7. When the second hairpin wire 7 is connected to the lead wire 5, the third bending section 14 or the fourth bending section 15 in the second hairpin wire 7 is connected to the fifth bending section 19 in the lead wire 5. Correspondingly, when two adjacent second hairpin wires 7 are connected, the third bending section 14 or the fourth bending section 15 is connected to the corresponding fourth bending section 15 or third bending section 14.

[0080] The lead wires 5 in the first, second, and third branches are all connected to the same wire. In specific implementation, the fifth bend segment 19 of the lead wire 5 is connected to the third bend segment 14 or the fourth bend segment 15, and the lead segment 18 is connected to a copper busbar. Only one copper busbar is set, and all lead segments 18 in the first, second, and third branches are connected to this copper busbar.

[0081] Preferably, in the second branch, there are 25 hairpin wires 4, 2 lead wires 5, 1 first hairpin wire 6, and 22 second hairpin wires 7; the connection route of the 25 hairpin wires 4 in the stator slot 3 in the second branch is as follows: 54 slot a layer - 46 slot b layer - 35 slot a layer - 27 slot b layer - 19 slot a layer - 11 slot b layer - 1 slot c layer - 47 slot d layer - 36 slot c layer - 28 slot d layer - 17 slot c layer - 9 slot d layer - 53 slot e layer - 45 slot f layer - 37 slot e layer - 29 slot f layer - 18 slot e layer - 10 slot f layer - 54 slot g layer - 46 slot h layer - 35 slot g layer - 27 slot h layer - 19 slot g layer - 11 slot h layer - 2 slot h layer - 10 slot g layer - 18 slot h layer Layer -26 slot g, layer -37 slot h, layer -45 slot g, layer -1 slot f, layer -9 slot e, layer -20 slot f, layer -28 slot e, layer -36 slot f, layer -44 slot e, layer -54 slot d, layer -8 slot c, layer -19 slot d, layer -27 slot c, layer -38 slot d, layer -46 slot c, layer -2 slot b, layer -10 slot a, layer -18 slot b, layer -26 slot a, layer -37 slot b, layer -45 slot a; wherein, the first hairpin wire 6 is only disposed in layer h; the lead wire 5 is only disposed in layer a.

[0082] Because the first hairpin wire 6 and the second hairpin wire 7 in the second branch have few span types (specifically only two types, namely y1 and y2, where y1 is 9 and y2 is 8, 10 or 11, for a total of 4), the above design can avoid circulating current between multiple parallel branches of each phase winding, thereby improving the efficiency of the motor.

[0083] Preferably, in the third branch, there are 25 hairpin wires 4, 2 lead wires 5, 1 first hairpin wire 6, and 22 second hairpin wires 7; the connection route of the 25 hairpin wires 4 in the stator slot 3 in the third branch is as follows: 53 slot a layer - 45 slot b layer - 37 slot a layer - 29 slot b layer - 18 slot a layer - 10 slot b layer - 54 slot c layer - 46 slot d layer - 35 slot c layer - 27 slot d layer - 19 slot c layer - 11 slot d layer - 1 slot e layer - 47 slot f layer - 36 slot e layer - 28 slot f layer - 17 slot e layer - 9 slot f layer - 53 slot g layer - 4 The layers are: 5 slots h layer - 37 slots g layer - 29 slots h layer - 18 slots g layer - 10 slots h layer - 1 slot h layer - 9 slots g layer - 20 slots h layer - 28 slots g layer - 36 slots h layer - 44 slots g layer - 54 slots f layer - 8 slots e layer - 19 slots f layer - 27 slots e layer - 38 slots f layer - 46 slots e layer - 2 slots d layer - 10 slots c layer - 18 slots d layer - 26 slots c layer - 37 slots d layer - 45 slots c layer - 1 slot b layer - 9 slots a layer - 20 slots b layer - 28 slots a layer - 36 slots b layer - 44 slots a layer; wherein, the first hairpin wire 6 is only disposed in the h layer; the lead wire 5 is only disposed in the a layer.

[0084] Because the first hairpin wire 6 and the second hairpin wire 7 in the third branch have few span types (specifically only two types, namely y1 and y2, where y1 is 9 and y2 is 8, 10 or 11, for a total of 4), the above design can avoid circulating current between multiple parallel branches of each phase winding, thereby improving the efficiency of the motor.

[0085] It should be noted that, in order to further balance the electromotive force and avoid circulating current, the number of slots per pole per phase is q = Z / (2Pm), q = 54 / (6 * 3) = 3. That is, a 6-pole, 54-slot motor normally has 3 slots allocated per pole per phase. For details, please refer to... Figure 8 , Figure 9 and Figure 10 .

[0086] Additionally, the following description is provided for the lead wire 5, which is only installed on layer a, and the first hairpin wire 6, which is only installed on layer h:

[0087] In this embodiment, the wiring method for all the first hairpin wires 6 set in the h layer is as follows: (There are a total of 9 first hairpin wires 6, 3 in each phase and 1 in each branch)

[0088] In the U-phase winding, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 in the first branch are respectively embedded in slot 9 and slot 54; in the second branch, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 are respectively embedded in slot 10 and slot 1; in the third branch, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 are respectively embedded in slot 11 and slot 2.

[0089] In the V-phase winding, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 in the first branch are respectively embedded in slot 3 and slot 48; in the second branch, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 are respectively embedded in slot 4 and slot 49; in the third branch, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 are respectively embedded in slot 5 and slot 50.

[0090] In the W-phase winding, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 in the first branch are respectively embedded in slot 51 and slot 42; in the second branch, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 are respectively embedded in slot 52 and slot 43; in the third branch, the first straight segment 11 and the second straight segment 12 of the first hairpin wire 6 are respectively embedded in slot 53 and slot 44.

[0091] Table 1. The wiring method for all first hairpin wires 6 set only on layer h is as follows:

[0092] The wiring method for all lead-out conductors 5 set only on layer a is as follows: (There are a total of 18 lead-out conductors 5, 6 for each phase winding and 2 for each branch)

[0093] In the U-phase winding, in the first branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 1, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 46; in the second branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 54, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 45; in the third branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 53, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 44.

[0094] In the V-phase winding, in the first branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 49, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 40; in the second branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 48, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 39; in the third branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 47, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 38.

[0095] In the W-phase winding, in the first branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 43, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 34; in the second branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 42, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 33; in the third branch, the fifth straight segment 20 of one lead wire 5 is embedded in slot 41, and the fifth straight segment 20 of the other lead wire 5 is embedded in slot 32.

[0096] Table 2 shows the wiring method for all lead-out conductors 5 installed only on layer a:

[0097] This utility model also provides a flat wire motor, including a flat wire motor stator.

[0098] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A flat wire motor stator, characterized in that: Including stator core (1) and stator winding (2); Multiple stator slots (3) are evenly distributed circumferentially on the inner sidewall of the stator core (1). Each stator slot (3) has N slot layers arranged radially along the stator core (1). The slot layers are configured for wiring of the stator winding (2). The flat wire motor stator is used for a flat wire motor with Z stator slots (3) and P pole pairs. The stator winding (2) includes a multi-phase winding, each phase winding including multiple parallel branches, each branch consisting of multiple hairpin wires (4) with different pitches y connected in series. The hairpin wire (4) includes two pitches y; The first type is y1, where y1 = τ = Z / 2P, and τ is the polar moment; The second type is y2, which is one of y2=τ-1, y2=τ+1, or y2=τ+2.

2. The flat wire motor stator according to claim 1, characterized in that: The phase windings of the multiphase system include U-phase windings, V-phase windings, and W-phase windings; The U-phase winding is based on the stator core axis and deflected by 360° / (2Pm)×2 angles in the first direction to obtain the V-phase winding. The V-phase winding is based on the stator core axis and deflected by 360° / (2Pm)×2 angles in the first direction to obtain the W-phase winding. P is the number of pole pairs and m is the number of phases, where the number of phases is 3.

3. The flat wire motor stator according to claim 1 or 2, characterized in that: The hairpin wire (4) includes three types, namely lead wire (5), first hairpin wire (6) and second hairpin wire (7). The number of groove layers N is 8, and the directions of the 8 groove layers from the groove opening to the groove bottom are a, b, c, d, e, f, g and h respectively; The first hairpin wire (6) is only located in layer h; the lead wire (5) is only located in layer a.

4. The flat wire motor stator according to claim 3, characterized in that: The number of phases in the multiphase winding is m, and the number of branches is k; The total number of the lead-out conductors (5) is 2km; The total number of the first hairpin wires (6) is km; the number of the hairpin wires (4) is L, L=(Z*N-2*k*m) / 2+2km; The number of lead wires (5) in each phase winding is 2y, and the number of first hairpin wires (6) in each phase winding is y.

5. The flat wire motor stator according to claim 3, characterized in that: The first hairpin wire (6) includes a first connecting section (8), a first bent section (9), a second bent section (10), and a first straight section (11) and a second straight section (12) configured to be embedded in two stator slots (3) respectively. The first straight segment (11) and the second straight segment (12) are parallel and spaced apart. The same end of the first straight segment (11) and the second straight segment (12) are respectively positioned and connected to the two ends of the first connecting segment (8). The same other end of the first straight segment (11) and the second straight segment (12) are respectively positioned and connected to the first bending segment (9) and the second bending segment (10). The first bending segment (9) and the second bending segment (10) both extend to the outside of the stator slot and bend along the circumference of the stator core (1), and the bending directions are the same; The span between the first straight segment (11) and the second straight segment (12) in the stator slot (3) is equal to the pitch y1, which is equal to the pole pitch τ, y1=τ=Z / 2P.

6. The flat wire motor stator according to claim 3, characterized in that: The second hairpin wire (7) includes a second connecting section (13), a third bent section (14), a fourth bent section (15), and a third straight section (16) and a fourth straight section (17) configured to be embedded in two stator slots (3) respectively. The third straight segment (16) and the fourth straight segment (17) are parallel and spaced apart. The same end of the third straight segment (16) and the fourth straight segment (17) are respectively positioned and connected to the two ends of the second connecting segment (13). The same other end of the third straight segment (16) and the fourth straight segment (17) are respectively connected to the third bending segment (14) and the fourth bending segment (15). The third bending section (14) and the fourth bending section (15) both extend to the outside of the stator slot and bend along the circumference of the stator core (1), and the bending directions are opposite. The span of the third straight segment (16) and the fourth straight segment (17) in the stator slot (3) is equal to the pitch y2, where y2 is one of y2=τ-1, y2=τ+1, or y2=τ+2.

7. The flat wire motor stator according to claim 3, characterized in that: The lead wire (5) includes a lead section (18), a fifth bend section (19), and a fifth straight section (20) configured to be embedded in the stator slot (3) and extend along the axial direction of the stator core (1). The lead-out section (18), the fifth straight section (20) and the fifth bent section (19) are connected in sequence, and the fifth bent section (19) extends to the outside of the stator slot and bends along the circumference of the stator core (1).

8. The flat wire motor stator according to claim 3, characterized in that: The phase windings of the multiphase system include U-phase windings, V-phase windings, and W-phase windings; Based on the U-phase winding, the U-phase winding includes a first branch, a second branch, and a third branch connected in parallel; The lead wires (5) in the first, second and third branches are all connected to the same wire to achieve parallel connection; In the first branch, there are 25 hairpin wires (4), 2 lead wires (5), 1 first hairpin wire (6), and 22 second hairpin wires (7); In the first branch, the connection route of the 25 hairpin wires (4) in the stator slot (3) is as follows: slot a layer - slot b layer 47 - slot a layer 36 - slot b layer 28 - slot a layer 17 - slot b layer 9 - slot c layer 53 - slot d layer 45 - slot c layer 37 - slot c layer 29 - slot d layer 18 - slot c layer 10 - slot d layer 54 - slot e layer 46 - slot f layer 35 - slot e layer 27 - slot f layer 19 - slot e layer 11 - slot f layer 1 - slot g layer 47 - slot h layer 36 - slot g layer -28 slot h layer -17 slot g layer -9 slot h layer -54 slot h layer -8 slot g layer -19 slot h layer -27 slot g layer -38 slot h layer -46 slot g layer -2 slot f layer -10 slot e layer -18 slot f layer -26 slot e layer -37 slot f layer -45 slot e layer -1 slot d layer -9 slot c layer -20 slot d layer -28 slot c layer -36 slot d layer -44 slot c layer -54 slot b layer -8 slot a layer -19 slot b layer -27 slot a layer -38 slot b layer -46 slot a layer; The first hairpin wire (6) is only located in layer h; the lead wire (5) is only located in layer a.

9. The flat wire motor stator according to claim 8, characterized in that: In the second branch, there are 25 hairpin wires (4), 2 lead wires (5), 1 first hairpin wire (6), and 22 second hairpin wires (7); In the second branch, the connection route of the 25 hairpin wires (4) in the stator slots (3) is as follows: 54 slot a layer - 46 slot b layer - 35 slot a layer - 27 slot b layer - 19 slot a layer - 11 slot b layer - 1 slot c layer - 47 slot d layer - 36 slot c layer - 28 slot d layer - 17 slot c layer - 9 slot d layer - 53 slot e layer - 45 slot f layer - 37 slot e layer - 29 slot f layer - 18 slot e layer - 10 slot f layer - 54 slot g layer - 46 slot h layer - 35 slot g layer - 27 slot h layer - 19 slot g layer - 11 slot h Layer-2 slot h, layer-10 slot g, layer-18 slot h, layer-26 slot g, layer-37 slot h, layer-45 slot g, layer-1 slot f, layer-9 slot e, layer-20 slot f, layer-28 slot e, layer-36 slot f, layer-44 slot e, layer-54 slot d, layer-8 slot c, layer-19 slot d, layer-27 slot c, layer-38 slot d, layer-46 slot c, layer-2 slot b, layer-10 slot a, layer-18 slot b, layer-26 slot a, layer-37 slot b, layer-45 slot a.

10. The flat wire motor stator according to claim 8, characterized in that: In the third branch, there are 25 hairpin wires (4), 2 lead wires (5), 1 first hairpin wire (6), and 22 second hairpin wires (7); In the third branch, the connection route of the 25 hairpin wires (4) in the stator slot (3) is as follows: 53 slots a layer - 45 slots b layer - 37 slots a layer - 29 slots b layer - 18 slots a layer - 10 slots b layer - 54 slots c layer - 46 slots d layer - 35 slots c layer - 27 slots d layer - 19 slots c layer - 11 slots d layer - 1 slot e layer - 47 slots f layer - 36 slots e layer - 28 slots f layer - 17 slots e layer - 9 slots f layer - 53 slots g layer - 45 slots h layer - 37 slots g layer - 29 slots h layer - 18 slots g layer - 10 slots h Layer-1 slot h, layer-9 slot g, layer-20 slot h, layer-28 slot g, layer-36 slot h, layer-44 slot g, layer-54 slot f, layer-8 slot e, layer-19 slot f, layer-27 slot e, layer-38 slot f, layer-46 slot e, layer-2 slot d, layer-10 slot c, layer-18 slot d, layer-26 slot c, layer-37 slot d, layer-45 slot c, layer-1 slot b, layer-9 slot a, layer-20 slot b, layer-28 slot a, layer-36 slot b, layer-44 slot a.

11. A flat wire motor, characterized in that: Includes the flat wire motor stator as described in any one of claims 1-10.

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