Stator assembly, motor, driving assembly and vehicle

Abstract

A stator assembly, a motor, a driving assembly and a vehicle, the stator assembly comprises a stator core and a stator winding, and the inner wall of the stator core is provided with a plurality of stator slots around the circumferential direction of the stator core; the stator winding is inserted into the stator slot, the stator winding comprises a plurality of same-layer hairpin coils and a plurality of cross-layer hairpin coils, the cross-layer hairpin coils are connected between two adjacent same-layer hairpin coils, and the spans of the plurality of cross-layer hairpin coils are m; the same-layer hairpin coils located on the outermost side in the radial direction of the stator core comprise a first hairpin coil with the span being n1, a second hairpin coil with the span being n2 and a third hairpin coil with the span being n3. The same-layer hairpin coils located on the innermost side in the radial direction of the stator core comprise a fourth hairpin coil with the span of n4, a fifth hairpin coil with the span of n5, a sixth hairpin coil with the span of n6 and a seventh hairpin coil with the span of n7. The height of the end part of the stator assembly is small, so that the overall size of the motor with the stator assembly is reduced.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a stator assembly, a motor, a drive assembly and a vehicle. Background Art

[0002] Electric vehicles have leading advantages over traditional fuel vehicles in terms of power, intelligence, and cost of use, but the disadvantage of long charging time limits the promotion of electric vehicles. In order to solve the problem of long charging time for electric vehicles and to improve the power density of electric vehicle drive systems, the drive motor is usually a flat wire motor. The stator assembly of the flat wire motor includes a stator core and a multi-phase winding. The stator core is circumferentially distributed with multiple stator slots, and each stator slot is provided with multiple layers of conductors constituting a multi-phase winding.

[0003] After the stator winding of the existing motor stator assembly is wound, the end of the stator winding is relatively high, resulting in a large volume of the motor. Utility Model Content

[0004] The purpose of the present application is to provide a stator assembly, a motor, a drive assembly and a vehicle to solve the problem that the end height of the stator winding is relatively high, resulting in a large volume of the motor.

[0005] To achieve the purpose of this application, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a stator assembly, comprising:

[0007] A stator core, wherein a plurality of stator slots are arranged on the inner wall of the stator core in a circumferential direction around the stator core;

[0008] A stator winding is inserted in the stator slot, the pole pitch of the stator winding is τ, the stator winding includes a plurality of same-layer hairpin coils and a plurality of cross-layer hairpin coils, the cross-layer hairpin coils are connected between two adjacent same-layer hairpin coils, and the spans of the plurality of cross-layer hairpin coils are all m; the same-layer hairpin coils located at the radially outermost side of the stator core include a first hairpin coil with a span of n1, a second hairpin coil with a span of n2, and a third hairpin coil with a span of n3; the same-layer hairpin coils located at the radially innermost side of the stator core include a fourth hairpin coil with a span of n4, a fifth hairpin coil with a span of n5, a sixth hairpin coil with a span of n6, and a seventh hairpin coil with a span of n7;

[0009] Where τ is an integer, m < τ, n1 > n2 > n3, n4 < n5 < n6 < n7, (n1 + n3) / 2 = n2 = (n4 + n7) / 2 = (n5 + n6) / 2 = τ, the pole pitch represents the number of stator slots spanned by each pole of the stator winding, and the span represents the number of stator slots spanned by the same-layer hairpin coil or the inter-layer hairpin coil.

[0010] In one embodiment, τ is 9, m is 8, n1 is 11, n2 is 9, n3 is 7, n4 is 7, n5 is 8, n6 is 10, and n7 is 11.

[0011] In one embodiment, the number of stator slots is 72, the number of poles of the stator winding is 8, and the stator winding includes three phase windings, and each phase winding is one-way or two-way or four-way.

[0012] In one embodiment, each phase winding includes two first-group coils, two second-group coils, two third-group coils, two fourth-group coils, two fifth-group coils, and two sixth-group coils connected in sequence;

[0013] Each phase winding starts with the first-group coil and is sequentially connected with one second-group coil, one third-group coil, one first-group coil, one second-group coil, one third-group coil, one fourth-group coil, one fifth-group coil, one sixth-group coil, one fourth-group coil, one fifth-group coil, and one sixth-group coil.

[0014] In one embodiment, the inter-layer hairpin coil includes an eighth hairpin coil and a ninth hairpin coil, and the first-group coil includes the first hairpin coil, the eighth hairpin coil, the ninth hairpin coil, the fourth hairpin coil, the ninth hairpin coil, and the eighth hairpin coil connected in sequence.

[0015] The second-group coil includes the first hairpin coil, the eighth hairpin coil, the ninth hairpin coil, the fifth hairpin coil, the ninth hairpin coil, and the eighth hairpin coil connected in sequence.

[0016] The third-group coil includes the second hairpin coil, the eighth hairpin coil, the ninth hairpin coil, the fifth hairpin coil, the ninth hairpin coil, and the eighth hairpin coil connected in sequence.

[0017] The fourth-group coil includes the third hairpin coil, the eighth hairpin coil, the ninth hairpin coil, the sixth hairpin coil, the ninth hairpin coil, and the eighth hairpin coil connected in sequence.

[0018] The fifth group of coils includes the second card-isolating coil, the eighth card-isolating coil, the ninth card-isolating coil, the sixth card-isolating coil, the ninth card-isolating coil and the eighth card-isolating coil which are connected in sequence.

[0019] The sixth group of coils includes the third card-issuing coil, the eighth card-issuing coil, the ninth card-issuing coil, the seventh card-issuing coil, the ninth card-issuing coil and the eighth card-issuing coil which are connected in sequence.

[0020] In one embodiment, in each of the phase windings, one end of the first hairpin coil in the first group of coils located at the starting point is a lead wire connection end, the eighth hairpin coil at the end of the sixth group of coils located at the end point is a star point connection end, and the star point connection ends between the three phase windings are connected.

[0021] In one implementation, the lead wire connection ends and the star point connection ends in the three phase windings are located at the same axial end of the stator core.

[0022] In one embodiment, each of the stator slots includes an ath layer, a bth layer, a cth layer, a dth layer, an eth layer, and an fth layer arranged in sequence from the inside to the outside along the radial direction of the iron core;

[0023] The first hairpin coil comprises a first oblique section, a first insertion section, a first bending section, a second insertion section and a second oblique section which are connected in sequence, the first oblique section and the second oblique section are both inclined toward the same end of the first bending section, the second hairpin coil comprises a third oblique section, a third insertion section, a second bending section, a fourth insertion section and a fourth oblique section which are connected in sequence, the third oblique section and the fourth oblique section are both inclined toward the same end of the second bending section, the third hairpin coil comprises a fifth oblique section, a fifth insertion section, a third bending section, a sixth insertion section and a sixth oblique section which are connected in sequence, the fifth oblique section and the sixth oblique section are both inclined toward the same end of the third bending section, and the first insertion section, the second insertion section, the third insertion section, the fourth insertion section, the fifth insertion section and the sixth insertion section are respectively inserted in the fth layer of different stator slots;

[0024] The fourth hairpin coil includes a seventh oblique section, a seventh insertion section, a fourth bending section, an eighth insertion section and an eighth oblique section connected in sequence, and the seventh oblique section and the eighth oblique section are both inclined toward the same end of the fourth bending section. The fifth hairpin coil includes a ninth oblique section, a ninth insertion section, a fifth bending section, a tenth insertion section and a tenth oblique section connected in sequence, and the ninth oblique section and the tenth oblique section are both inclined toward the same end of the fifth bending section. The sixth hairpin coil includes an eleventh oblique section, an eleventh insertion section, a sixth bending section, a twelfth insertion section and a twelfth oblique section connected in sequence. The eleventh oblique section and the twelfth oblique section are both inclined toward the same end of the sixth bending section, the seventh hairpin coil comprises a thirteenth oblique section, a thirteenth insertion section, a seventh bending section, a fourteenth insertion section and a fourteenth oblique section which are sequentially connected, the thirteenth oblique section and the fourteenth oblique section are both inclined toward the same end of the seventh bending section, and the seventh insertion section, the eighth insertion section, the ninth insertion section, the tenth insertion section, the eleventh insertion section, the twelfth insertion section, the thirteenth insertion section and the fourteenth insertion section are respectively inserted in the a-th layer of different stator slots;

[0025] The eighth hairpin coil comprises a fifteenth oblique section, a fifteenth inserting section, an eighth bending section, a sixteenth inserting section and a sixteenth oblique section which are connected in sequence, the fifteenth oblique section and the sixteenth oblique section are inclined toward one end away from each other, the fifteenth inserting section is inserted in the e-th layer of one stator slot, and the sixteenth inserting section is inserted in the d-th layer of another stator slot;

[0026] The ninth hairpin coil includes a seventeenth oblique section, a seventeenth insertion section, a ninth bending section, an eighteenth insertion section and an eighteenth oblique section connected in sequence, the seventeenth oblique section and the eighteenth oblique section are inclined toward one end away from each other, the seventeenth insertion section is inserted in the cth layer of one stator slot, and the eighteenth insertion section is inserted in the bth layer of another stator slot.

[0027] In one embodiment, the five adjacent stator slots into which each phase winding is inserted are sequentially the first stator slot, the second stator slot, the third stator slot, the fourth stator slot and the fifth stator slot;

[0028] The fth layer of the first stator slot, the fth layer of the second stator slot and the fth layer of the third stator slot are respectively inserted with the same-layer hairpin coils of the same phase;

[0029] The e-th layer of the first stator slot, the e-th layer of the second stator slot and the e-th layer of the third stator slot are respectively inserted with the cross-layer hairpin coils of the same phase;

[0030] The dth and cth layers of the second stator slot, the dth and cth layers of the third stator slot, and the dth and cth layers of the fourth stator slot are respectively inserted with the cross-layer hairpin coils of the same phase;

[0031] The bth layer of the third stator slot, the bth layer of the fourth stator slot and the bth layer of the fifth stator slot are respectively inserted with the cross-layer hairpin coils of the same phase;

[0032] The a-th layer of the third stator slot, the a-th layer of the fourth stator slot, and the a-th layer of the fifth stator slot are respectively inserted with the same-layer hairpin coils of the same phase.

[0033] In a second aspect, the present application also provides an electric motor, comprising the stator assembly as described above.

[0034] In a third aspect, the present application also provides a drive assembly, comprising the motor as described above.

[0035] In a fourth aspect, the present application also provides a vehicle comprising the motor or drive assembly as described above.

[0036] The stator assembly provided in the embodiment of the present application is achieved by using the same span for the cross-layer hairpin coils of the stator winding, and the span m of the cross-layer hairpin coils is less than the pole pitch τ, which is a short pitch; the hairpin coils on the same layer use a variety of hairpin coils with different spans, wherein the span n1 of the first hairpin coil is greater than the pole pitch τ, the span n2 of the second hairpin coil is equal to the pole pitch τ, the span n3 of the third hairpin coil is less than the pole pitch τ, the span n4 of the fourth hairpin coil is less than the pole pitch τ, the span n5 of the fifth hairpin coil is less than the pole pitch τ, the span n6 of the sixth hairpin coil is greater than the pole pitch τ, and the span n7 of the seventh hairpin coil is greater than the pole pitch τ, that is, the first hairpin coil, the fourth hairpin coil and the fifth hairpin coil are short pitches, the second hairpin coil is full pitch, and the sixth hairpin coil and the seventh hairpin coil are long pitches, thereby the end height of the stator winding formed by the hairpin coils on the same layer and the cross-layer hairpin coils is small, so that the overall volume of the motor with the stator assembly is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A three-dimensional diagram of a stator assembly according to an embodiment of the present application;

[0039] Figure 2A three-dimensional diagram of a stator winding according to an embodiment of the present application;

[0040] Figure 3 A partial structural top view of a stator core according to an embodiment of the present application;

[0041] Figure 4 This is a structural diagram of a first card issuing coil in one embodiment of the present application;

[0042] Figure 5 This is a structural diagram of a second card issuing coil in one embodiment of the present application;

[0043] Figure 6 This is a structural diagram of a third card issuing coil according to an embodiment of the present application;

[0044] Figure 7 This is a structural diagram of a fourth card issuing coil according to an embodiment of the present application;

[0045] Figure 8 This is a structural diagram of a fifth hairpin coil according to an embodiment of the present application;

[0046] Fig. 9 This is a structural diagram of a sixth hairpin coil according to an embodiment of the present application;

[0047] Fig.10 This is a structural diagram of a seventh hairpin coil according to an embodiment of the present application;

[0048] Fig.11 This is a structural diagram of an eighth hairpin coil according to an embodiment of the present application;

[0049] Fig.12 This is a structural diagram of a ninth hairpin coil according to an embodiment of the present application;

[0050] Fig.13 A winding diagram of a phase A stator winding according to an embodiment of the present application;

[0051] Fig.14 This is a winding diagram of a three-phase stator winding according to an embodiment of the present application.

[0052] Description of reference numerals:

[0053] 100, stator core; 110, stator slot; 111, first stator slot; 112, second stator slot; 113, third stator slot; 114, fourth stator slot; 115, fifth stator slot; 200, stator winding; 210, same-layer hairpin coil; 211, first hairpin coil; 211a, first oblique section; 211b, first insertion section; 211c, first bending section; 211d, second insertion section; 211e, second oblique section; 212, second hairpin coil; 212a, third oblique section; 212b, third insertion section 212c, second bending section; 212d, fourth insertion section; 212e, fourth oblique section; 213, third hairpin coil; 213a, fifth oblique section; 213b, fifth insertion section; 213c, third bending section; 213d, sixth insertion section; 213e, sixth oblique section; 214, fourth hairpin coil; 214a, seventh oblique section; 214b, seventh insertion section; 214c, fourth bending section; 214d, eighth insertion section; 214e, eighth oblique section; 215, fifth hairpin coil; 215a, seventh 9th oblique section; 215b, 9th insertion section; 215c, 5th bending section; 215d, 10th insertion section; 215e, 10th oblique section; 216, 6th hairpin coil; 216a, 11th oblique section; 216b, 11th insertion section; 216c, 6th bending section; 216d, 12th insertion section; 216e, 12th oblique section; 217, 7th hairpin coil; 217a, 13th oblique section; 217b, 13th insertion section; 217c, 7th bending section; 217d, 14th insertion section; 217e, 14th Oblique section; 220, cross-layer hairpin coil; 221, eighth hairpin coil; 221a, fifteenth oblique section; 221b, fifteenth insertion section; 221c, eighth bending section; 221d, sixteenth insertion section; 221e, sixteenth oblique section; 222, ninth hairpin coil; 222a, seventeenth oblique section; 222b, seventeenth insertion section; 222c, ninth bending section; 222d, eighteenth insertion section; 222e, eighteenth oblique section; 230, lead-out wire connection end; 240, star point connection end; 250, star point connector. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0057] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0058] In new energy vehicles, the powertrain is an important part of the vehicle. The powertrain is installed on the vehicle frame. The powertrain includes a motor, a reducer and a differential. The motor provides power for the vehicle, so the performance requirements for vehicle drive motors are getting higher and higher. The motor includes a stator and a rotor. The rotor is accommodated in the stator, and the rotating magnetic field generated by the stator causes the rotor to rotate.

[0059] The driving motor is usually a flat wire motor. The stator assembly of the flat wire motor includes a stator core and a multi-phase winding. The stator core is provided with a plurality of stator slots distributed in the circumferential direction. Each stator slot is provided with a plurality of layers of conductors constituting the multi-phase winding.

[0060] After the stator winding of the existing motor stator assembly is wound, the end of the stator winding is relatively high, resulting in a large volume of the motor.

[0061] refer to Figure 1-Figure 10 The present application provides a stator assembly, including a stator core 100 and a stator winding 200. A plurality of stator slots 110 are arranged on the inner wall of the stator core 100 in the circumferential direction of the stator core 100; the stator winding 200 is inserted into the stator slots 110, and the pole pitch of the stator winding 200 is τ. The stator winding 200 includes a plurality of same-layer hairpin coils 210 and a plurality of cross-layer hairpin coils 220. The cross-layer hairpin coils 220 are connected between two adjacent same-layer hairpin coils 210, and the spans of the plurality of cross-layer hairpin coils 220 are all m; the same-layer hairpin coils 210 located at the radially outermost side of the stator core 100 include a first hairpin coil 211 (such as Figure 4 As shown), a second hairpin coil 212 with a span of n2 (as shown Figure 5 As shown) and a third hairpin coil 213 with a span of n3 (as shown Figure 6as shown); the same-layer hairpin coils 210 located at the innermost radial position of the stator core 100 include a fourth hairpin coil 214 with a span of n4 (as Figure 7 shown), a fifth hairpin coil 215 with a span of n5 (as Figure 8 shown), a sixth hairpin coil 216 with a span of n6 (as Fig. 9 shown), and a seventh hairpin coil 217 with a span of n7 (as Fig.10 shown); where τ is an integer, m < τ, n1 > n2 > n3, n4 < n5 < n6 < n7, (n1 + n3) / 2 = n2 = (n4 + n7) / 2 = (n5 + n6) / 2 = τ, the pole pitch represents the number of stator slots 110 spanned by each pole of the stator winding 200, and the span represents the number of stator slots 110 spanned by the same-layer hairpin coils 210 or the inter-layer hairpin coils 220.

[0062] Specifically, the motor stator assembly is the stationary part in motors such as motors, generators, and starters. The motor stator can also include a frame, etc., and the frame is used to carry the stator core 100 and the stator winding 200 on the stator core 100. The main function of the stator assembly is to generate a rotating magnetic field, and the main function of the rotor that cooperates with the motor stator is to be cut by the magnetic lines of force in the rotating magnetic field and then output (or generate) current.

[0063] The stator winding 200 of the present application is formed by stacking and winding a plurality of same-layer hairpin coils 210 and a plurality of inter-layer hairpin coils 220. By setting two different spans for the same-layer hairpin coils 210, the cooperation of the long-and-short pitch same-layer hairpin coils 210 can effectively avoid interference between the same-layer hairpin coils 210, prevent short circuits, facilitate the installation of the hairpin coils, and the inter-layer hairpin coils 220 adopt one span, reducing the types of spans of the hairpin coils in the stator winding 200, and thus solving the problem of reducing the types of hairpin coils while ensuring that the hairpin coils do not interfere with each other.

[0064] The stator assembly provided in the embodiment of the present application is achieved by using the same span for the cross-layer hairpin coils 220 of the stator winding 200, and the span m of the cross-layer hairpin coils 220 is less than the pole pitch τ, which is a short span; the same-layer hairpin coils 210 use a plurality of hairpin coils with different spans, wherein the span n1 of the first hairpin coil 211 is greater than the pole pitch τ, the span n2 of the second hairpin coil 212 is equal to the pole pitch τ, the span n3 of the third hairpin coil 213 is less than the pole pitch τ, the span n4 of the fourth hairpin coil 214 is less than the pole pitch τ, and the span n5 of the fifth hairpin coil 215 is equal to the pole pitch τ. The span n5 is smaller than the pole pitch τ, the span n6 of the sixth hairpin coil 216 is larger than the pole pitch τ, and the span n7 of the seventh hairpin coil 217 is larger than the pole pitch τ, that is, the first hairpin coil 211, the fourth hairpin coil 214 and the fifth hairpin coil 215 are of short pitch, the second hairpin coil 212 is of full pitch, the sixth hairpin coil 216 and the seventh hairpin coil 217 are of long pitch, and thus the end height of the stator winding 200 formed by winding the hairpin coils 210 on the same layer and the hairpin coils 220 on the cross layer is smaller, so that the overall volume of the motor having the stator assembly is reduced.

[0065] In one embodiment, the pole pitch τ is 9, m is 8, n1 is 11, n2 is 9, n3 is 7, n4 is 7, n5 is 8, n6 is 10, and n7 is 11. That is, the pole pitch of the stator winding 200 is 9, the spans of the cross-layer hairpin coils 220 are all 8, and the spans of the same-layer hairpin coils 210 are 7, 8, 9, 10, and 11. Among them, the spans of the same-layer hairpin coils 210 located at the radially outermost side of the stator core 100 are short, full, and long, and the spans of the same-layer hairpin coils 210 located at the radially innermost side of the stator core 100 are short and long. Specifically, six hairpin coils are provided in each stator slot 110 of the stator core 100 of the present application, and the same-layer hairpin coils 210 and the cross-layer hairpin coils 220 are stacked; wherein, the same-layer hairpin coils 210 are arranged in the innermost and outermost layers of the stator slots 110, the middle layer is the cross-layer hairpin coil 220, and the cross-layer hairpin coils 220 are the cross-layers between adjacent layers. Since hairpin coils of different widths are required to be inserted into the stator slots 110 at different radial depths, for the motor stator of the present application, a total of four hairpin coils are required for the innermost layer, two hairpin coils are required for the middle layer, and three hairpin coils are required for the outermost layer. Therefore, the stator winding 200 of the present application requires a total of nine hairpin coils. The stator winding 200 formed by these hairpin coils can effectively reduce the height of the stator winding 200, thereby reducing the use of materials and reducing the cost of the motor.

[0066] The number of stator slots 110 of the stator core 100 of the present application is 72, the number of poles of the stator winding 200 is 8, and the stator winding 200 includes three phase windings, each of which has one, two or four phase windings. The embodiment of the present application is described with one phase winding, and is not limited to other embodiments.

[0067] Each phase winding includes two first coils, two second coils, two third coils, two fourth coils, two fifth coils and two sixth coils connected to each other; wherein each phase winding starts from the first coil and is sequentially connected with a second coil, a third coil, a first coil, a second coil, a third coil, a fourth coil, a fifth coil, a sixth coil, a fourth coil, a fifth coil and a sixth coil. That is, each phase winding is arranged according to a certain rule, which facilitates the automatic assembly of the stator winding 200 as a whole and improves the assembly efficiency of the stator winding 200.

[0068] refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 The cross-layer hairpin coil 220 includes an eighth hairpin coil 221 (such as Fig.11 As shown) and the ninth hairpin coil 222 (as shown Fig.12 As shown), the first group of coils includes the first card-isolating coil 211, the eighth card-isolating coil 221, the ninth card-isolating coil 222, the fourth card-isolating coil 214, the ninth card-isolating coil 222 and the eighth card-isolating coil 221 connected in sequence, the second group of coils includes the first card-isolating coil 211, the eighth card-isolating coil 221, the ninth card-isolating coil 222, the fifth card-isolating coil 215, the ninth card-isolating coil 222 and the eighth card-isolating coil 221 connected in sequence, and the third group of coils includes the second card-isolating coil 212, the eighth card-isolating coil 221, the ninth card-isolating coil 222, the fifth card-isolating coil 215, the ninth card-isolating coil 222 and the eighth card-isolating coil 221 connected in sequence. 1, the fourth group of coils includes the third hairpin coil 213, the eighth hairpin coil 221, the ninth hairpin coil 222, the sixth hairpin coil 216, the ninth hairpin coil 222 and the eighth hairpin coil 221 connected in sequence, the fifth group of coils includes the second hairpin coil 212, the eighth hairpin coil 221, the ninth hairpin coil 222, the sixth hairpin coil 216, the ninth hairpin coil 222 and the eighth hairpin coil 221 connected in sequence, and the sixth group of coils includes the third hairpin coil 213, the eighth hairpin coil 221, the ninth hairpin coil 222, the seventh hairpin coil 217, the ninth hairpin coil 222 and the eighth hairpin coil 221 connected in sequence. That is, the hairpin coils in each phase winding are wired according to a certain rule so that the performance of the motor reaches a better state.

[0069] Specifically, in each phase winding, one end of the first hairpin coil 211 in the first group of coils located at the starting point is the lead wire connection end 230, and the lead wire connection end 230 of each phase winding is used to be connected to an external circuit. The eighth hairpin coil 221 at the end of the sixth group of coils located at the end point is the star point connection end 240. The star point connection ends 240 between the three phase windings are connected through a star point connector 250 to achieve connectivity of the three-phase windings.

[0070] In one embodiment, the lead wire connection terminal 230 and the star point connection terminal 240 in the three phase windings are all located at the same axial end of the stator core 100, which can fully utilize the height of the same end of the stator winding 200 and thereby reduce the overall height of the stator winding 200.

[0071] In one embodiment, each stator slot 110 includes an ath layer, a bth layer, a cth layer, a dth layer, an eth layer, and an fth layer arranged in sequence from the inside to the outside along the radial direction of the iron core; the first hairpin coil 211 (such as Figure 4 The first oblique section 211a and the second oblique section 211e are inclined toward the same end of the first bending section 211c, thereby reducing the height of the first oblique section 211a and the second oblique section 211e; the second hairpin coil 212 (as shown in FIG. Figure 5 The third oblique section 212a, the third inserting section 212b, the second bending section 212c, the fourth inserting section 212d and the fourth oblique section 212e are connected in sequence, and the third oblique section 212a and the fourth oblique section 212e are inclined toward the same end of the second bending section 212c, thereby reducing the height of the third oblique section 212a and the fourth oblique section 212e; the third hairpin coil 213 (as shown in FIG. Figure 6 The stator 110 of the embodiment of the present invention comprises a fifth inclined section 213a, a fifth insertion section 213b, a third bending section 213c, a sixth insertion section 213d and a sixth inclined section 213e which are connected in sequence. The fifth inclined section 213a and the sixth inclined section 213e are inclined toward the same end of the third bending section 213c, thereby reducing the heights of the fifth inclined section 213a and the sixth inclined section 213e; and the first insertion section 211b, the second insertion section 211d, the third insertion section 212b, the fourth insertion section 212d, the fifth insertion section 213b and the sixth insertion section 213d are respectively inserted in the fth layer of different stator slots 110.

[0072] The fourth hairpin coil 214 (such as Figure 7The fifth hairpin coil 215 (as shown) includes a seventh oblique section 214a, a seventh insertion section 214b, a fourth bending section 214c, an eighth insertion section 214d and an eighth oblique section 214e which are connected in sequence. The seventh oblique section 214a and the eighth oblique section 214e are inclined toward the same end of the fourth bending section 214c, thereby reducing the height of the seventh oblique section 214a and the eighth oblique section 214e; Figure 8 The sixth hairpin coil 216 (as shown) includes a ninth oblique section 215a, a ninth insertion section 215b, a fifth bending section 215c, a tenth insertion section 215d and a tenth oblique section 215e which are connected in sequence. The ninth oblique section 215a and the tenth oblique section 215e are inclined toward the same end of the fifth bending section 215c, thereby reducing the height of the ninth oblique section 215a and the tenth oblique section 215e. Fig. 9 The seventh hairpin coil 217 (as shown) includes an eleventh oblique section 216a, an eleventh inserting section 216b, a sixth bending section 216c, a twelfth inserting section 216d and a twelfth oblique section 216e connected in sequence, and the eleventh oblique section 216a and the twelfth oblique section 216e are inclined toward the same end of the sixth bending section 216c, thereby reducing the height of the eleventh oblique section 216a and the twelfth oblique section 216e; Fig.10 The stator 110 of the embodiment of the present invention comprises a thirteenth oblique section 217a, a thirteenth insertion section 217b, a seventh bending section 217c, a fourteenth insertion section 217d and a fourteenth oblique section 217e which are connected in sequence. The thirteenth oblique section 217a and the fourteenth oblique section 217e are inclined toward the same end of the seventh bending section 217c, thereby reducing the heights of the thirteenth oblique section 217a and the fourteenth oblique section 217e; and the seventh insertion section 214b, the eighth insertion section 214d, the ninth insertion section 215b, the tenth insertion section 215d, the eleventh insertion section 216b, the twelfth insertion section 216d, the thirteenth insertion section 217b and the fourteenth insertion section 217d are respectively inserted in the a-th layer of different stator slots 110.

[0073] The eighth hairpin coil 221 (such as Fig.11 The stator 110 is provided with a first stator slot 110 having a first insertion section 221a and a second insertion section 221d. The stator 110 is provided with a first stator slot 110 having a first insertion section 221b and a second insertion section 221d. The stator 110 is provided with a first stator slot 110 having a first insertion section 221d and a second insertion section 221e ... insertion section 221d and a second insertion section 221e. The Fig.12The stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention, and the stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention. The stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention, and the stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention. The stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention, and the stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention. The stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention, and the stator winding 200 is provided with a stator winding 200 of the embodiment of the present invention.

[0074] refer to Figure 2 and Figure 3 , the five adjacent stator slots 110 into which each phase winding is inserted are the first stator slot 111, the second stator slot 112, the third stator slot 113, the fourth stator slot 114 and the fifth stator slot 115 in sequence; the f-th layer of the first stator slot 111, the f-th layer of the second stator slot 112 and the f-th layer of the third stator slot 113 are respectively inserted with the same-phase same-layer hairpin coils 210; the e-th layer of the first stator slot 111, the e-th layer of the second stator slot 112 and the e-th layer of the third stator slot 113 are respectively inserted with the same-phase cross-layer hairpin coils 220; The dth and cth layers of the second stator slot 112, the dth and cth layers of the third stator slot 113, and the dth and cth layers of the fourth stator slot 114 are respectively inserted with the same-phase cross-layer hairpin coils 220; the bth layer of the third stator slot 113, the bth layer of the fourth stator slot 114, and the bth layer of the fifth stator slot 115 are respectively inserted with the same-phase cross-layer hairpin coils 220; the ath layer of the third stator slot 113, the ath layer of the fourth stator slot 114, and the ath layer of the fifth stator slot 115 are respectively inserted with the same-phase same-layer hairpin coils 210. Specifically, after the stator winding 200 of the present application is wound, the hairpin coils of the five adjacent stator slots 110 inserted by the same-phase winding adopt an asymmetric winding method in the slot, which can largely eliminate the 5th and 7th harmonics of the air gap magnetic field, weaken the 48th order torque fluctuation of the motor by more than 80%, and improve the motor performance.

[0075] In the following, the number of stator slots 110 is 72, and the three-phase windings are respectively an A-phase winding, a B-phase winding, and a C-phase winding. The wiring of the A-phase winding is now described.

[0076] refer to Figure 1 , Fig.13 and Fig.14 , for the A-phase winding, 3f is the lead-out connection terminal 230 of the A-phase winding, represented by A; 64e is the star point connection terminal 240 of the A-phase winding, represented by X. The specific wiring method of the A-phase winding is as follows:

[0077]

[0078] Among them, 3f->64f is the starting card issuing coil of the A phase winding, and the starting card issuing unit is the first card issuing coil 211 (such as Figure 4 56d->64e is the termination coil of the A-phase winding, which is the eighth coil 221 (as shown); Fig.11 The values ​​in brackets indicate the span of each card issuing coil.

[0079] The above only takes the wiring of the A-phase winding as an example, and the wiring of the other two phases, such as the B-phase and the C-phase windings, can also be achieved according to the above rules.

[0080] B represents the lead-out connection terminal 230 of the B-phase winding, Y represents the star point connection terminal 240 of the B-phase winding; C represents the lead-out connection terminal 230 of the C-phase winding, and Z represents the star point connection terminal 240 of the C-phase winding. Among them, X, Y, and Z among the three-phase windings are connected, and A, B, and C are connected to the external circuit.

[0081] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0082] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A stator assembly, characterized in that: Comprising: A stator core, on the inner wall of which a plurality of stator slots are provided along the circumferential direction of the stator core; A stator winding inserted into the stator slots, the pole pitch of the stator winding being τ, the stator winding including a plurality of same-layer hairpin coils and a plurality of inter-layer hairpin coils, the inter-layer hairpin coils being connected between two adjacent same-layer hairpin coils, the span of the plurality of inter-layer hairpin coils being m; the same-layer hairpin coil located at the outermost radial position of the stator core includes a first hairpin coil with a span of n1, a second hairpin coil with a span of n2, and a third hairpin coil with a span of n3; the same-layer hairpin coil located at the innermost radial position of the stator core includes a fourth hairpin coil with a span of n4, a fifth hairpin coil with a span of n5, a sixth hairpin coil with a span of n6, and a seventh hairpin coil with a span of n7; Wherein, τ is an integer, m < τ, n1 > n2 > n3, n4 < n5 < n6 < n7, (n1 + n3) / 2 = n2 = (n4 + n7) / 2 = (n5 + n6) / 2 = τ, the pole pitch represents the number of stator slots spanned by each pole of the stator winding, and the span represents the number of stator slots spanned by the same-layer hairpin coil or the inter-layer hairpin coil.

2. The stator assembly according to claim 1, characterized in that The τ is 9, the m is 8, the n1 is 11, the n2 is 9, the n3 is 7, the n4 is 7, the n5 is 8, the n6 is 10, and the n7 is 11.

3. The stator assembly according to claim 1, characterized in that: The number of stator slots is 72, the number of poles of the stator winding is 8, and the stator winding includes three phase windings, and each phase winding is one-way or two-way or four-way.

4. The stator assembly according to claim 3, characterized in that: Each phase winding includes two connected first group coils, two second group coils, two third group coils, two fourth group coils, two fifth group coils, and two sixth group coils; Each phase winding starts from the first group coil and is sequentially connected with one second group coil, one third group coil, one first group coil, one second group coil, one third group coil, one fourth group coil, one fifth group coil, one sixth group coil, one fourth group coil, one fifth group coil, and one sixth group coil.

5. The stator assembly according to claim 4, characterized in that The inter-layer hairpin coil includes an eighth hairpin coil and a ninth hairpin coil, and the first group coil includes the first hairpin coil, the eighth hairpin coil, the ninth hairpin coil, the fourth hairpin coil, the ninth hairpin coil, and the eighth hairpin coil connected in sequence; The second group coil includes the first hairpin coil, the eighth hairpin coil, the ninth hairpin coil, the fifth hairpin coil, the ninth hairpin coil, and the eighth hairpin coil connected in sequence; The third group coil includes the second hairpin coil, the eighth hairpin coil, the ninth hairpin coil, the fifth hairpin coil, the ninth hairpin coil, and the eighth hairpin coil connected in sequence; The fourth group of coils includes the third card-isolating coil, the eighth card-isolating coil, the ninth card-isolating coil, the sixth card-isolating coil, the ninth card-isolating coil and the eighth card-isolating coil which are connected in sequence. The fifth group of coils includes the second card-isolating coil, the eighth card-isolating coil, the ninth card-isolating coil, the sixth card-isolating coil, the ninth card-isolating coil and the eighth card-isolating coil which are connected in sequence. The sixth group of coils includes the third card-issuing coil, the eighth card-issuing coil, the ninth card-issuing coil, the seventh card-issuing coil, the ninth card-issuing coil and the eighth card-issuing coil which are connected in sequence.

6. The stator assembly according to claim 5, characterized in that In each of the phase windings, one end of the first hairpin coil in the first group of coils located at the starting point is a lead wire connection end, the eighth hairpin coil at the end of the sixth group of coils located at the end point is a star point connection end, and the star point connection ends between the three phase windings are connected.

7. The stator assembly according to claim 6, characterized in that The lead wire connection ends and the star point connection ends in the three phase windings are all located at the same end of the stator core in the axial direction.

8. The stator assembly according to claim 5, characterized in that Each of the stator slots comprises an ath layer, a bth layer, a cth layer, a dth layer, an eth layer, and an fth layer arranged in sequence from the inside to the outside along the radial direction of the iron core; The first hairpin coil comprises a first oblique section, a first insertion section, a first bending section, a second insertion section and a second oblique section which are connected in sequence, the first oblique section and the second oblique section are both inclined toward the same end of the first bending section, the second hairpin coil comprises a third oblique section, a third insertion section, a second bending section, a fourth insertion section and a fourth oblique section which are connected in sequence, the third oblique section and the fourth oblique section are both inclined toward the same end of the second bending section, the third hairpin coil comprises a fifth oblique section, a fifth insertion section, a third bending section, a sixth insertion section and a sixth oblique section which are connected in sequence, the fifth oblique section and the sixth oblique section are both inclined toward the same end of the third bending section, and the first insertion section, the second insertion section, the third insertion section, the fourth insertion section, the fifth insertion section and the sixth insertion section are respectively inserted in the fth layer of different stator slots; The fourth hairpin coil includes a seventh oblique section, a seventh insertion section, a fourth bending section, an eighth insertion section and an eighth oblique section connected in sequence, and the seventh oblique section and the eighth oblique section are both inclined toward the same end of the fourth bending section. The fifth hairpin coil includes a ninth oblique section, a ninth insertion section, a fifth bending section, a tenth insertion section and a tenth oblique section connected in sequence, and the ninth oblique section and the tenth oblique section are both inclined toward the same end of the fifth bending section. The sixth hairpin coil includes an eleventh oblique section, an eleventh insertion section, a sixth bending section, a twelfth insertion section and a twelfth oblique section connected in sequence. The eleventh oblique section and the twelfth oblique section are both inclined toward the same end of the sixth bending section, the seventh hairpin coil comprises a thirteenth oblique section, a thirteenth insertion section, a seventh bending section, a fourteenth insertion section and a fourteenth oblique section which are sequentially connected, the thirteenth oblique section and the fourteenth oblique section are both inclined toward the same end of the seventh bending section, and the seventh insertion section, the eighth insertion section, the ninth insertion section, the tenth insertion section, the eleventh insertion section, the twelfth insertion section, the thirteenth insertion section and the fourteenth insertion section are respectively inserted in the a-th layer of different stator slots; The eighth hairpin coil comprises a fifteenth oblique section, a fifteenth inserting section, an eighth bending section, a sixteenth inserting section and a sixteenth oblique section which are connected in sequence, the fifteenth oblique section and the sixteenth oblique section are inclined toward one end away from each other, the fifteenth inserting section is inserted in the e-th layer of one stator slot, and the sixteenth inserting section is inserted in the d-th layer of another stator slot; The ninth hairpin coil includes a seventeenth oblique section, a seventeenth insertion section, a ninth bending section, an eighteenth insertion section and an eighteenth oblique section connected in sequence, the seventeenth oblique section and the eighteenth oblique section are inclined toward one end away from each other, the seventeenth insertion section is inserted in the cth layer of one stator slot, and the eighteenth insertion section is inserted in the bth layer of another stator slot.

9. The stator assembly according to claim 8, characterized in that The five adjacent stator slots into which each phase winding is inserted are sequentially the first stator slot, the second stator slot, the third stator slot, the fourth stator slot and the fifth stator slot; The fth layer of the first stator slot, the fth layer of the second stator slot and the fth layer of the third stator slot are respectively inserted with the same-layer hairpin coils of the same phase; The e-th layer of the first stator slot, the e-th layer of the second stator slot and the e-th layer of the third stator slot are respectively inserted with the cross-layer hairpin coils of the same phase; The dth and cth layers of the second stator slot, the dth and cth layers of the third stator slot, and the dth and cth layers of the fourth stator slot are respectively inserted with the cross-layer hairpin coils of the same phase; The bth layer of the third stator slot, the bth layer of the fourth stator slot and the bth layer of the fifth stator slot are respectively inserted with the cross-layer hairpin coils of the same phase; The a-th layer of the third stator slot, the a-th layer of the fourth stator slot, and the a-th layer of the fifth stator slot are respectively inserted with the same-layer hairpin coils of the same phase.

10. A motor, characterized in that: Comprising the stator assembly according to any one of claims 1-9.

11. A drive assembly, characterized in that: Comprising the motor as claimed in claim 10.

12. A vehicle, characterized in that: Comprising the motor according to claim 10 or the drive assembly according to claim 11.

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