Motor stator, motor and vehicle

Abstract

The invention provides a motor stator, a motor and a vehicle, and relates to the technical field of electric driving. The motor stator comprises a stator iron core and a three-phase winding, a plurality of winding grooves are formed in the circumferential inner wall of the stator iron core, and each winding groove is provided with M layers of groove positions arranged in the radial direction of the stator iron core. Each parallel branch of the three-phase winding comprises a plurality of coil units, each coil unit comprises a plurality of coil groups and a first connecting section, each coil group is wound in the circumferential direction of the stator core at a first span along a first direction, and the first connecting section is connected between the starting end and the ending end of two adjacent coil groups at a second span; the starting ends of the two adjacent coil groups are respectively positioned at the same layer of slot positions of the two adjacent winding slots; the parallel branch further comprises a second connecting section, and the second connecting section is connected between the starting ends and the ending ends of the two adjacent coil units at a third span. The second span is larger than the first span, and the third span is smaller than the first span, so that the axial height of the motor can be reduced.

Description

Technical Field

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

[0002] With the rapid popularization of new energy vehicles, electric drive systems are developing rapidly towards high power density, low cost, high integration and high efficiency. Under this trend, high power density requires the motor to have high power and compact size.

[0003] In the related art, the electric drive system of new energy vehicles generally integrates a motor and a reducer, and the output shaft of the motor cooperates with the reducer so that the rotation of the motor output shaft is decelerated and output power is output through the reducer. The motor can be an asynchronous motor, and the motor includes a stator and a rotor. A flat wire winding is wound on the motor stator, and the flat wire winding has a welding section and a hairpin end. The flat wire winding can be wound in a star or triangle shape, and the flat wire winding has a variety of different line types. The wiring lead end of the flat wire winding is set at the hairpin end.

[0004] However, the winding method of the motor stator in the current electric drive system is complex, the span of the hairpin end is large, and it occupies a lot of space, resulting in an increase in the axial height of the motor. Summary of the invention

[0005] The present application provides a motor stator, a motor and a vehicle to solve the technical problems in the current electric drive system that the winding method of the motor stator is complex, the span of the hairpin end is large, and a lot of space is occupied, resulting in an increase in the axial height of the motor.

[0006] In a first aspect, the present application provides a motor stator, which includes a stator core and a three-phase winding. The circumferential inner wall of the stator core is provided with a plurality of winding slots, each winding slot has M layers of slots arranged radially along the stator core; the three-phase winding is arranged in the slots; each phase of the three-phase winding includes at least two parallel branches.

[0007] Each parallel branch includes a plurality of coil units, each coil unit includes a coil group and a first connecting section, there are a plurality of coil groups, each coil group is wound around the circumference of the stator core along the first direction with a first span, the first connecting section is connected between the starting end and the ending end of two adjacent coil groups with a second span; the starting ends of the two adjacent coil groups are respectively located at the same slot layer of two adjacent winding slots; the parallel branch also includes a second connecting section, the second connecting section is connected between the starting end and the ending end of two adjacent coil units with a third span. The second span is greater than the first span, and the third span is less than the first span.

[0008] The motor stator provided in the embodiment of the present application is designed with a winding method for the parallel branches of the three-phase winding. Each coil unit includes a plurality of coil groups wound in a first direction, and the span of the connecting section between adjacent coil units is smaller than the span when the coil group is wound. This reduces the height of the three-phase winding at the end of the stator core, reduces costs, and can reduce the axial height of the motor, thereby improving the compactness of the structure.

[0009] As an optional implementation, the conductors in each winding slot are of the same phase; in the same winding slot, different parallel branches are alternately arranged along the arrangement direction of the multiple slots.

[0010] Such an arrangement can ensure the consistency of the winding methods of different parallel branches and avoid the end height of the local winding being too high.

[0011] As an optional implementation manner, different coil units of the same parallel branch are separated by at least one slot in the same winding slot.

[0012] Such an arrangement allows the same parallel branch to be arranged alternately across layers during winding, thereby improving winding efficiency.

[0013] As an optional implementation, the first span is d1, the second span is d2, and the third span is d3, wherein d2=d1+1, d3=d1-2.

[0014] Such an arrangement can reduce the span between the coil groups, thereby reducing the end height when the coil groups are connected.

[0015] As an optional embodiment, the number of slots set in each winding slot is M=6; the number of winding slots is Q=54; the number of pole pairs is P=3; each phase of the three-phase winding may include two parallel branches, each parallel branch includes three coil units, and each coil unit includes three coil groups; the first span d1=9; the second span d2=10; the third span d3=7.

[0016] Such an arrangement reduces the number of coil lines, reduces the span between coil groups, and further reduces the end height when the coil groups are connected.

[0017] As an optional implementation, the winding directions of the multiple coil groups in the same parallel branch around the stator core are the same; and the winding directions of the coil groups in different parallel branches around the stator core are opposite.

[0018] With such an arrangement, different parallel branches of the same phase can be arranged alternately, making full use of the end space of the stator core and reducing the height of the three-phase winding at the end of the stator core.

[0019] As an optional embodiment, the coil group may include multiple cross-layer wires, which are connected in sequence and wound around the circumference of the stator core; wherein the cross-layer wires are spanned between two winding slots, the span of the cross-layer wires is a first span, and the slot positions of the two winding slots spanned by the cross-layer wires are adjacent in number of layers; and the multiple cross-layer wires are alternately spanned in sequence between the slot positions of two adjacent layers.

[0020] With such arrangement, a plurality of coil groups can be gradually wound from a slot position at one end edge of the winding slot to a slot position at the other end edge.

[0021] As an optional embodiment, the three-phase windings are connected in a star shape, and each three-phase winding may include a lead wire and a star point line, and the winding slot where the lead wire is located and the winding slot where the star point line is located are separated by a third span; one of the lead wire and the star point line is located at the first layer of M-layer slots, and the other of the lead wire and the star point line is located at the Mth layer of the M-layer slots.

[0022] Such an arrangement can improve the convenience of motor stator wiring.

[0023] As an optional implementation, the three-phase winding has a hairpin end and a welding end, which are respectively located at two ends of the axial direction of the stator core; the lead wire and the star point line are both located at the same end of the axial direction of the stator core as the welding end.

[0024] With this arrangement, the wire can be output at the welding end, simplifying the wire insertion process.

[0025] In a second aspect, the present application provides a motor, which includes the motor stator in the above technical solution.

[0026] In a third aspect, the present application provides a vehicle, which includes the motor in the above technical solution.

[0027] The present application provides a motor stator, a motor and a vehicle, wherein the motor stator includes a stator core and a three-phase winding, the circumferential inner wall of the stator core is provided with a plurality of winding slots, each winding slot has M layers of slots arranged radially along the stator core; the three-phase winding is arranged in the slots; each phase of the three-phase winding includes at least two parallel branches, each parallel branch includes a plurality of coil units, each coil unit includes a coil group and a first connecting section, there are multiple coil groups, each coil group is wound around the circumference of the stator core along a first direction with a first span, the first connecting section is connected between the starting end and the ending end of two adjacent coil groups with a second span; the starting ends of the two adjacent coil groups are respectively located at the same layer of slots of two adjacent winding slots; the parallel branch also includes a second connecting section, and the second connecting section is connected between the starting end and the ending end of two adjacent coil units with a third span. The second span is greater than the first span, and the third span is less than the first span, thereby reducing the height of the three-phase winding at the end of the stator core, reducing costs, and reducing the axial height of the motor to improve structural compactness.

[0028] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the motor stator, motor and vehicle provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the structure of a motor stator provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of winding slots in a motor stator provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of a parallel branch of three-phase windings in a motor stator provided in an embodiment of the present application;

[0033] Figure 4 A winding schematic diagram of a first parallel branch of a first winding method of a three-phase winding in a motor stator provided in an embodiment of the present application;

[0034] Figure 5A schematic diagram of the winding of the second parallel branch of the first winding method of the three-phase winding in the motor stator provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of the winding of the first parallel branch of the second winding method of the three-phase winding in the motor stator provided in an embodiment of the present application;

[0036] Figure 7 A schematic diagram of the winding of the second parallel branch of the second winding method of the three-phase winding in the motor stator provided in an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 10-motor stator;

[0039] 100-stator core; 101-winding slot; 102-slot position;

[0040] 200-three-phase winding; 201-parallel branch; 210-hairpin end; 220-welding end; 231-lead wire; 232-star point line. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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.

[0042] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0043] Secondly, it should be noted that in the description of the present application, terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0044] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] At present, the electric drive system of new energy vehicles is developing rapidly in the direction of high power density, low cost, high integration and high efficiency. Under this trend, high power density requires the motor to have high power and compact size. The electric drive system of new energy vehicles generally integrates a motor and a reducer. The output shaft of the motor cooperates with the reducer so that the rotation of the motor output shaft is decelerated and output power is output through the reducer. The motor can be an asynchronous motor, which includes a stator and a rotor. A flat wire winding is wound on the motor stator, and the flat wire winding has a welding section and a hairpin end. The winding method of the flat wire winding can be star-shaped or triangle-shaped. The flat wire winding has a variety of different line types, and the wiring lead-out end of the flat wire winding is set at the hairpin end. However, the winding method of the motor stator in the current electric drive system is complicated, the hairpin end has a large span, and occupies a lot of space, resulting in an increase in the axial height of the motor.

[0047] In response to the above problems, the embodiments of the present application provide a motor stator, a motor and a vehicle. By designing the winding method of the parallel branches of the three-phase windings, the winding span of the motor stator is shortened, and the span of the connecting section between adjacent coil units is smaller than the span when the coil group is wound, thereby reducing the height of the three-phase winding at the end of the stator core, thereby reducing the cost, and can reduce the axial height of the motor and improve the compactness of the structure.

[0048] The number of motor poles, that is, the number of magnetic poles of the motor. The magnetic poles are divided into N poles and S poles. Generally, one N pole and one S pole are called a pair of magnetic poles, that is, the number of pole pairs is 1. The number of pole pairs of the motor is 1, 2, 3, 4, and the number of poles of the motor is 2, 4, 6, or 8.

[0049] The span refers to the number of slots between two adjacent effective sides of a coil. The span is also called the pitch. The value of the pitch is expressed in the number of slots. It should be noted that the effective side refers to the part of the coil winding located in the stator slot, which can cut the magnetic field and induce electromotive force in the stator slot. For example, when the number of slots between two adjacent effective sides of one phase winding (such as the U phase winding) is 6, the pitch is 6. For another example, when the number of slots between two adjacent effective sides of one phase winding (such as the U phase winding) is 12, the pitch is 12.

[0050] The technical solution of the present application will be described in detail below through specific embodiments.

[0051] Figure 1 A schematic diagram of the structure of a motor stator provided in an embodiment of the present application, Figure 2 A schematic diagram of the structure of winding slots in a motor stator provided in an embodiment of the present application, Figure 3 A schematic diagram of a parallel branch of three-phase windings in a motor stator provided in an embodiment of the present application, Figure 4 A schematic diagram of the winding of the first parallel branch of the first winding method of the three-phase winding in the motor stator provided in an embodiment of the present application, Figure 5 A winding schematic diagram of the second parallel branch of the first winding method of the three-phase winding in the motor stator provided in an embodiment of the present application.

[0052] like Figures 1 to 5 As shown, the embodiment of the present application provides a motor stator 10, which includes a stator core 100 and a three-phase winding 200. The circumferential inner wall of the stator core 100 is provided with a plurality of winding slots 101, each of which has M layers of slots 102 arranged radially along the stator core 100, and the three-phase winding 200 is arranged in the slots 102. Each phase of the three-phase winding 200 includes at least two parallel branches 201.

[0053] Among them, each parallel branch 201 includes multiple coil units, each coil unit includes a coil group and a first connecting section, there are multiple coil groups, each coil group is wound around the circumference of the stator core 100 along the first direction with a first span, and the first connecting section is connected between the starting end and the ending end of two adjacent coil groups with a second span; the starting ends of the two adjacent coil groups are respectively located at the same layer slot position 102 of the two adjacent winding slots 101; the parallel branch 201 also includes a second connecting section, and the second connecting section is connected between the starting end and the ending end of the two adjacent coil units with a third span.

[0054] In some embodiments, the second span is greater than the first span, and the third span is less than the first span.

[0055] The stator assembly is used for a three-phase motor with a winding slot 101 number of Q and a pole pair number of P, and the number of winding slots 101 per pole per phase is q=Q / 6p. The pole pitch of the motor stator 10 is defined as d, d=Q / 2p, the first span may be equal to the pole pitch d, the second span may be greater than the pole pitch d, and the third span may be less than the pole pitch d.

[0056] It can be understood that each coil unit includes multiple coil groups wound in a first direction, and the span of the connecting section between adjacent coil units is smaller than the span when the coil group is wound, thereby reducing the height of the three-phase winding 200 at the end of the stator core 100, reducing costs, and reducing the axial height of the motor, thereby improving the compactness of the structure.

[0057] It should be noted that the number of slots 102 in each winding slot 101 is M, and M is an even number. The conductor of the three-phase winding 200 can be a flat copper wire, and the bare copper slot fill rate of the flat copper wire can reach more than 60%. The higher the slot fill rate, the lower the DC resistance of the three-phase winding 200 can be when the number of slots 102 remains unchanged, thereby reducing the copper consumption of the motor, improving the efficiency of the motor, increasing the cruising range of the electric vehicle, and reducing the powertrain cost.

[0058] In addition, the flat copper wire of each phase of the three-phase winding 200 can be a U-shaped wire or an I-shaped wire, or the flat copper wire of each phase of the three-phase winding 200 can be a U-shaped wire. The U-shaped wire is arranged in two winding slots 101 with a certain span, and the I-shaped wire is arranged in one winding slot 101. Each phase of the three-phase winding 200 can have a plurality of U-shaped wires, and the difference between different U-shaped wires is the different spans, that is, according to different specific winding methods, the flat copper wire of each phase winding has U-shaped wires with a plurality of spans.

[0059] Please continue to refer to Figures 1 to 5 In a possible implementation, the conductors in each winding slot 101 are of the same phase. In the same winding slot 101, different parallel branches 201 are alternately arranged along the arrangement direction of multiple slots 102, so as to ensure the consistency of the winding methods of different parallel branches 201 and avoid the end height of the local winding being too high.

[0060] Exemplarily, each item of the three-phase winding 200 includes two parallel branches, and the flat wire conductors of the two parallel branches are arranged alternately in the same winding slot 101 along the arrangement direction of the plurality of slots 102. For example, the first slot 102 is provided with the conductor of the first parallel branch 201, the second slot 102 is provided with the conductor of the second parallel branch 201, and the third slot 102 is provided with the conductor of the first parallel branch 201, and so on, alternating back and forth until the Mth slot 102.

[0061] It should be noted that, for each parallel branch 201 of each phase winding line of the three-phase winding 200, the starting end and the ending end of the winding are both located at the edge slot 102 in the M-layer slot 102. For example, if the starting end is located at the slot 102 of the first layer, the ending end is located at the slot 102 of the Mth layer; or, if the starting end is located at the slot 102 of the Mth layer, the ending end is located at the slot 102 of the first layer.

[0062] In some embodiments, different coil units of the same parallel branch 201 are separated by at least one slot 102 in the same winding slot 101. In this way, the same parallel branch 201 can be alternately arranged across layers during winding, thereby improving winding efficiency.

[0063] Exemplarily, the coils of the three-phase winding 200 include U phase, W phase and V phase, and the conductors of U phase, W phase and V phase are respectively arranged in different winding slots 101. In this way, the U phase, W phase and V phase are staggered at a certain angle in the circumferential direction of the stator core 100, so that there is a certain lag or lead electrical angle between two adjacent phases.

[0064] It should be noted that the V-phase winding lags the U-phase winding by 120° electrical angle, and the W-phase winding leads the U-phase winding by 120° electrical angle. When the number of pole pairs P is 3, the mechanical angle is 40°.

[0065] In a possible implementation, the first span is d1, the second span is d2, and the third span is d3, wherein d2=d1+1, d3=d1-2. In this way, the span between the coil groups can be reduced, thereby reducing the end height when the coil groups are connected.

[0066] For example, the number of slots 102 set in each winding slot 101 is M=6; the number of winding slots 101 is Q=54; the number of pole pairs is P=3; each phase of the three-phase winding 200 may include two parallel branches 201, each parallel branch 201 includes three coil units, and each coil unit includes three coil groups; the first span d1=9; the second span d2=10; the third span d3=7. In this way, the number of coil groups is reduced, the span between coil groups is reduced, and the end height when the coil groups are connected is reduced.

[0067] In the embodiment of the present application, the three-phase winding 200 can be connected in a star shape, and each three-phase winding 200 can include a lead wire 231 and a star point line 232. The winding slot 101 where the lead wire 231 is located and the winding slot 101 where the star point line 232 is located are separated by a third span. One of the lead wire 231 and the star point line 232 is located at the first layer of the M-layer slot 102, and the other of the lead wire 231 and the star point line 232 is located at the Mth layer of the M-layer slot 102, thereby improving the convenience of wiring the motor stator 10.

[0068] Among them, star connection is a wiring method for a three-phase AC power supply and a three-phase AC appliance. The three star point lines 232 of the three-phase winding 200 are connected together to form a common point, and the lead lines 231 are respectively connected to the three live wires of the three-phase power supply.

[0069] It is understandable that the three-phase winding 200 has a hairpin end 210 and a welding end 220, and the hairpin end 210 and the welding end 220 are respectively located at two ends of the axial direction of the stator core 100. In some embodiments, the lead wire 231 and the star point line 232 are both located at the same end of the stator core 100 as the welding end 220, so that the wire can be led out at the welding end 220, simplifying the wire insertion process. In other embodiments, the lead wire 231 and the star point line 232 are both located at the same end of the stator core 100 as the hairpin end 210, thereby improving the convenience of wiring the motor stator 10.

[0070] The following is a detailed explanation using different specific winding examples.

[0071] The slots 102 of each M-layer winding slot 101 are defined as layer a, layer b, layer c, layer d, layer e, and layer f. The 54 winding slots 101 are numbered from 1 to 54.

[0072] Please refer to Figure 4 and Figure 5 When the lead wire 231 and the star point wire 232 are both located at the same end of the stator core 100 as the welding end 220, the three-phase winding 200 is wound in the following manner:

[0073] The starting end A1 of the first parallel branch 201 of the U phase corresponds to the lead line 231, and the ending end X1 corresponds to the star point line 232. The winding method of the first parallel branch 201 of the U phase is as follows:

[0074] 1a-10b-19a-28b-37a-46b-2a-11b-20a-29b-38a-47b-3a-12b-21a-30b-39a-48b-1c-10d-19c-28d-37c-46d-2c-11d-20c- 29d-38c-47d-3c-12d-21c-30d-39c-48d-1e-10f-19e-28f-37e-46f-2e-11f-20e-29f-38e-47f-3e-12f-21e-30f-39e-48f.

[0075] Among them, 1a-10b-19a-28b-37a-46b-2a-11b-20a-29b-38a-47b-3a-12b-21a-30b-39a forms a first coil unit, 10d-19c-28d-37c-46d-2c-11d-20c-29d-38c-47d-3c-12d-21c-30d-39c forms a second coil unit, and 10f-19e-28f-37e-46f-2e-11f-20e-29f-38e-47f-3e-12f-21e-30f-39e-48f forms a third coil unit. Each parallel branch 201 has two second connecting sections, and the second connecting section is arranged between 48b-1c and 48d-1e.

[0076] Taking the first coil unit as an example, 1a-10b-19a-28b-37a-46b, 2a-11b-20a-29b-38a-47b, and 3a-12b-21a-30b-39a-48b form three coil groups, and each coil unit includes two first connecting sections, and the first connecting sections are spanned between 46b-2a and 47b-3a.

[0077] It is understandable that the first parallel branch 201 may include four types of conductors. The four types of conductors are defined as first type conductors, second type conductors, third type conductors and fourth type conductors. The first type conductor is an I-shaped wire, and the second type conductor, the third type conductor and the fourth type conductor are U-shaped wires.

[0078] Exemplarily, the first type of conductor corresponds to the lead-out line 231 and the star point line 232 of the first parallel branch 201, that is, the conductors 1a and 48f are provided with the first type of conductor. The first type of conductor is an I-type conductor.

[0079] Exemplarily, the span of the second type of conductor is a first span d1, d1=9, including U-shaped conductors spanned by 10b-19a, 28b-37a, 11b-20a, 29b-38a, 12b-21a, 39a-48b, etc.

[0080] Exemplarily, the span of the third type of conductor is the second span d2, d2=10, including the U-shaped conductors spanned by 48b-1c and 48d-1e.

[0081] Exemplarily, the span of the fourth type of conductor is the third span d3, d2=7, including the U-shaped conductors spanned by 39a-46b and 39c-46d.

[0082] The starting end A2 of the second parallel branch 201 of the U phase corresponds to the lead line 231, and the ending end X2 corresponds to the star point line 232. The winding method of the second parallel branch 201 of the U phase is as follows:

[0083] 3f-48e-39f-30e-21f-12e-2f-47e-38f-29e-20f-11e-1f-46e-37f-28e-19f-10e-

[0084] 3d-48c-39d-30c-21d-12c-2d-47c-38d-29c-20d-11c-1d-46c-37d-28c-19d-10c- 3b-48a-39b-30a-21b-12a-2b-47a-38b-29a-20b-11a-1b-46a-37b-28a-19b-10a;

[0085] It should be noted that the winding direction of the second parallel branch 201 of the U phase is opposite to that of the second parallel branch 201. The specific conductor type and winding rule of the second parallel branch 201 are the same as those of the second parallel branch 201, which will not be repeated here.

[0086] The starting end B1 of the first parallel branch 201 of the V phase corresponds to the lead-out line 231, and the ending end Y1 corresponds to the star point line 232. The winding method of the first parallel branch 201 of the V phase is as follows:

[0087] 7a-16b-25a-34b-43a-52b-8a-17b-26a-35b-44a-53b-9a-18b-27a-36b-45a-54b-7c-16d-25c-34d-43c-52d-8c-17d-26c- 35d-44c-53d-9c-18d-27c-36d-45c-54d-7e-16f-25e-34f-43e-52f-8e-17f-26e-35f-44e-53f-9e-18f-27e-36f-45e-54f.

[0088] The starting end B2 of the second parallel branch 201 of the V phase corresponds to the lead line 231, and the ending end Y2 corresponds to the star point line 232. The winding method of the second parallel branch 201 of the V phase is as follows:

[0089] 9f-54e-45f-36e-27f-18e-8f-53e-44f-35e-26f-17e-7f-52e-43f-34e-25f-16e-

[0090] 9d-54c-45d-36c-27d-18c-8d-53c-44d-35c-26d-17c-7d-52c-43d-34c-25d-16c- 9b-54a-45b-36a-27b-18a-8b-53a-44b-35a-26b-17a-7b-52a-43b-34a-25b-16a.

[0091] It should be noted that the slot pitch difference between the V phase and the U phase is 6. The specific winding method and conductor type of the V phase are the same as those of the U phase and will not be described in detail here.

[0092] The starting end C1 of the first parallel branch 201 of the W phase corresponds to the lead line 231, and the ending end Z1 corresponds to the star point line 232. The winding method of the first parallel branch 201 of the W phase is as follows:

[0093] 13a-22b-31a-40b-49a-4b-14a-23b-32a-41b-50a-5b-15a-24b-33a-42b-51a-6b-13c-22d-31c-40d-49c-4d-14c-23d-32c -41d-50c-5d-15c-24d-33c-42d-51c-6d-13e-22f-31e-40f-49e-4f-14e-23f-32e-41f-50e-5f-15e-24f-33e-42f-51e-6f;

[0094] The starting end C2 of the second parallel branch 201 of the W phase corresponds to the lead line 231, and the ending end Z2 corresponds to the star point line 232. The winding method of the second parallel branch 201 of the W phase is as follows:

[0095] 15f-6e-51f-42e-33f-24e-14f-5e-50f-41e-32f-23e-13f-4e-49f-40e-31f-22e-

[0096] 15d-6c-51d-42c-33d-24c-14d-5c-50d-41c-32d-23c-13d-4c-49d-40c-31d-22c- 15b-6a-51b-42a-33b-24a-14b-5a-50b-41a-32b-23a-13b-4a-49b-40a-31b-22a.

[0097] It should be noted that the slot pitch difference between the V phase and the W phase is 6. The specific winding method and conductor type of the V phase are the same as those of the U phase and will not be described here.

[0098] Figure 6A schematic diagram of the winding of the first parallel branch of the second winding method of the three-phase winding in the motor stator provided in an embodiment of the present application, Figure 7 A schematic diagram of the winding of the second parallel branch of the second winding method of the three-phase winding in the motor stator provided in an embodiment of the present application.

[0099] Please refer to Figure 6 and Figure 7 When the lead wire 231 and the star point wire 232 are both located at the same end of the stator core 100 as the hairpin end 210, the three-phase winding 200 is wound in the following manner:

[0100] The starting end A1 of the first parallel branch 201 of the U phase corresponds to the lead line 231, and the ending end X1 corresponds to the star point line 232. The winding method of the first parallel branch 201 of the U phase is as follows:

[0101] 1a-10b-19a-28b-37a-47b-2a-11b-20a-29b-38a-48b-3a-12b-21a-30b-39a-46b-1c-10d-19c-28d-37c-47d-2c-11d-20c- 29d-38c-48d-3c-12d-21c-30d-39c-46d-1e-10f-19e-28f-37e-47f-2e-11f-20e-29f-38e-48f-3e-12f-21e-30f-39e-46f.

[0102] It is understandable that the first parallel branch 201 may include five types of conductors, all of which may be U-shaped flat wires. The five types of conductors are defined as the fifth type of conductor, the sixth type of conductor, the seventh type of conductor, the eighth type of conductor, and the ninth type of conductor.

[0103] Exemplarily, the fifth type of conductor corresponds to the lead-out line 231 of the first parallel branch 201, that is, the conductor 1a-10b is spanned by the fifth type of conductor. The span of the fifth type of conductor is the first span d1, d1=9.

[0104] Exemplarily, the sixth type of conductor corresponds to the star point line 232 of the first parallel branch 201, that is, the sixth type of conductor is spanned by 39e-46f. The span of the sixth type of conductor is the third span d3, d3=7.

[0105] Exemplarily, the span of the seventh type of conductor is the first span d1, corresponding to the conductors with a span of 9 other than the fifth type of conductor in the first parallel branch 201. Including U-shaped conductors spanned by 19a-28b, 2a-11b, 20a-29b, 3a-12b, 21a-30b, etc.

[0106] Exemplarily, the eighth type of conductor corresponds to the second span d2, d2=10, including the U-shaped conductors spanned by 37a-47b, 38a-48b, etc.

[0107] Exemplarily, the ninth type of conductor corresponds to the third span d3, d3=7, including the U-shaped conductors spanned by 39a-46b and 39c-46d.

[0108] The starting end A2 of the second parallel branch 201 of the U phase corresponds to the lead line 231, and the ending end X2 corresponds to the star point line 232. The winding method of the second parallel branch 201 of the U phase is as follows:

[0109] 3f-48e-39f-30e-21f-11e-2f-47e-38f-29e-20f-10e-1f-46e-37f-28e-19f-12e-

[0110] 3d-48c-39d-30c-21d-11c-2d-47c-38d-29c-20d-10c-1d-46c-37d-28c-19d-12c- 3b-48a-39b-30a-21b-11a-2b-47a-38b-29a-20b-10a-1b-46a-37b-28a-19b-12a.

[0111] It should be noted that the winding direction of the second parallel branch 201 of the U phase is opposite to that of the second parallel branch 201. The specific conductor type and winding rule of the second parallel branch 201 are the same as those of the second parallel branch 201, which will not be repeated here.

[0112] The starting end B1 of the first parallel branch 201 of the V phase corresponds to the lead-out line 231, and the ending end Y1 corresponds to the star point line 232. The winding method of the first parallel branch 201 of the V phase is as follows:

[0113] 7a-16b-25a-34b-43a-53b-8a-17b-26a-35b-44a-54b-9a-18b-27a-36b-45a-52b-7c-16d-25c-34d-43c-53d-8c-17d-26c- 35d-44c-54d-9c-18d-27c-36d-45c-52d-7e-16f-25e-34f-43e-53f-8e-17f-26e-35f-44e-54f-9e-18f-27e-36f-45e-52f.

[0114] The starting end B2 of the second parallel branch 201 of the V phase corresponds to the lead line 231, and the ending end Y2 corresponds to the star point line 232. The winding method of the second parallel branch 201 of the V phase is as follows:

[0115] 9f-54e-45f-36e-27f-17e-8f-53e-44f-35e-26f-16e-7f-52e-43f-34e-25f-18e-

[0116] 9d-54c-45d-36c-27d-17c-8d-53c-44d-35c-26d-16c-7d-52c-43d-34c-25d-18c- 9b-54a-45b-36a-27b-17a-8b-53a-44b-35a-26b-16a-7b-52a-43b-34a-25b-18a.

[0117] It should be noted that the slot pitch difference between the V phase and the U phase is 6. The specific winding method and conductor type of the V phase are the same as those of the U phase and will not be described in detail here.

[0118] The starting end C1 of the first parallel branch 201 of the W phase corresponds to the lead line 231, and the ending end Z1 corresponds to the star point line 232. The winding method of the first parallel branch 201 of the W phase is as follows:

[0119] 13a-22b-31a-40b-49a-5b-14a-23b-32a-41b-50a-6b-15a-24b-33a-42b-51a-4b-13c-22d-31c-40d-49c-5d-14c-23d-32c -41d-50c-6d-15c-24d-33c-42d-51c-4d-13e-22f-31e-40f-49e-5f-14e-23f-32e-41f-50e-6f-15e-24f-33e-42f-51e-4f;

[0120] The starting end C2 of the second parallel branch 201 of the W phase corresponds to the lead line 231, and the ending end Z2 corresponds to the star point line 232. The winding method of the second parallel branch 201 of the W phase is as follows:

[0121] 15f-6e-51f-42e-33f-23e-14f-5e-50f-41e-32f-22e-13f-4e-49f-40e-31f-24e-

[0122] 15d-6c-51d-42c-33d-23c-14d-5c-50d-41c-32d-22c-13d-4c-49d-40c-31d-24c- 15b-6a-51b-42a-33b-23a-14b-5a-50b-41a-32b-22a-13b-4a-49b-40a-31b-24a.

[0123] It should be noted that the slot pitch difference between the V phase and the W phase is 6. The specific winding method and conductor type of the V phase are the same as those of the U phase and will not be described here.

[0124] In the embodiment of the present application, the winding directions of the multiple coil groups of the same parallel branch 201 around the stator core 100 are the same; the winding directions of the coil groups of different parallel branches 201 around the stator core 100 are opposite. Different parallel branches 201 of the same phase can be staggered to make full use of the end space of the stator core 100 and reduce the height of the three-phase winding 200 at the end of the stator core 100.

[0125] It is understandable that the coil group may include a plurality of cross-layer wires, which are sequentially connected and wound around the stator core 100 in one circle; wherein the cross-layer wires are arranged in slots 102 of adjacent layers of two winding slots 101 with a first span; and the plurality of cross-layer wires are alternately arranged between slots 102 of two adjacent layers. In this way, the plurality of coil groups can be gradually wound from the slot 102 at one end edge of the winding slot 101 to the slot 102 at the other end edge.

[0126] The present application provides a motor, which includes the motor stator 10 in the above technical solution. The motor also includes a rotor, which is arranged in the middle of the stator core 100.

[0127] It should be noted that the motor provided in the embodiment of the present application includes all the technical solutions and technical effects of the above-mentioned motor stator 10, which will not be repeated here.

[0128] The embodiment of the present application also provides a car, which may include the electric drive system in the above technical solution. The car provided in the embodiment of the present application may be a new energy vehicle, including but not limited to a pure electric vehicle, a hybrid electric vehicle, a hydrogen energy vehicle, etc., which is not specifically limited in the embodiment of the present application.

[0129] The automobile provided in the embodiment of the present application has all the technical solutions and all the technical effects of the aforementioned electric drive system, which will not be repeated here.

[0130] The embodiment of the present application provides a motor stator 10, a motor and a vehicle, wherein the motor stator 10 includes a stator core 100 and a three-phase winding 200, a plurality of winding slots 101 are provided on the circumferential inner wall of the stator core 100, each winding slot 101 has M layers of slots 102 arranged radially along the stator core 100; the three-phase winding 200 is arranged in the slot 102; each phase of the three-phase winding 200 includes at least two parallel branches 201, each parallel branch 201 includes a plurality of coil units, each Each coil unit includes a coil group and a first connecting section. There are multiple coil groups. Each coil group is wound around the circumference of the stator core 100 along the first direction with a first span. The first connecting section is connected between the starting end and the ending end of two adjacent coil groups with a second span. The starting ends of the two adjacent coil groups are respectively located at the same slot position 102 of the two adjacent winding slots 101. The parallel branch 201 also includes a second connecting section, and the second connecting section is connected between the starting end and the ending end of the two adjacent coil units with a third span. The second span is greater than the first span, and the third span is less than the first span, thereby reducing the height of the three-phase winding 200 at the end of the stator core 100, reducing the cost, and reducing the axial height of the motor, improving the compactness of the structure.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A motor stator, characterized in that: The invention comprises a stator core and a three-phase winding, wherein the circumferential inner wall of the stator core is provided with a plurality of winding slots, each of the winding slots has M layers of slots arranged along the radial direction of the stator core; the three-phase winding is arranged in the slots; each phase of the three-phase winding comprises at least two parallel branches; Each of the parallel branches includes a plurality of coil units, each of the coil units includes a coil group and a first connecting section, there are a plurality of coil groups, each of the coil groups is wound around the circumference of the stator core along a first direction with a first span, the first connecting section is connected between the starting end and the ending end of two adjacent coil groups with a second span; the starting ends of two adjacent coil groups are respectively located at the slot positions of the same layer of two adjacent winding slots; the parallel branch also includes a second connecting section, the second connecting section is connected between the starting end and the ending end of two adjacent coil units with a third span; The second span is greater than the first span, and the third span is less than the first span.

2. The motor stator according to claim 1, characterized in that: The conductors in each of the winding slots are of the same phase; in the same winding slot, different parallel branches are alternately arranged along the arrangement direction of the plurality of slots.

3. The motor stator according to claim 1, characterized in that: Different coil units of the same parallel branch are separated by at least one slot in the same winding slot.

4. The motor stator according to any one of claims 1 to 3, characterized in that: The first span is d1, the second span is d2, and the third span is d3, wherein d2=d1+1, d3=d1-2.

5. The motor stator according to claim 4, characterized in that: The number of slots M set in each winding slot is 6; the number of winding slots Q is 54; the number of pole pairs P is 3; each phase of the three-phase winding includes two parallel branches, each of the parallel branches includes three coil units, and each of the coil units includes three coil groups; the first span d1 is 9; The second span d2=10; the third span d3=7.

6. The motor stator according to any one of claims 1 to 3, characterized in that: The winding directions of the multiple coil groups of the same parallel branch around the stator core are the same; the winding directions of the coil groups of different parallel branches around the stator core are opposite.

7. The motor stator according to any one of claims 1 to 3, characterized in that: The coil group includes a plurality of cross-layer wires, which are connected in sequence and arranged around the circumference of the stator core; wherein the cross-layer wires are arranged in two winding slots, the span of the cross-layer wires is the first span, and the slot positions of the two winding slots arranged by the cross-layer wires are adjacent in number of layers; and the plurality of cross-layer wires are arranged alternately in sequence between the slot positions of two adjacent numbers of layers.

8. The motor stator according to any one of claims 1 to 3, characterized in that: The three-phase windings are connected in a star shape, and each of the three-phase windings includes a lead wire and a star point line. The winding slot where the lead wire is located and the winding slot where the star point line is located are separated by a third span; one of the lead wire and the star point line is located at the first layer of the slots in the M layers, and the other of the lead wire and the star point line is located at the Mth layer of the slots in the M layers.

9. The motor stator according to claim 8, characterized in that: The three-phase winding has a hairpin end and a welding end, and the hairpin end and the welding end are respectively located at two ends of the stator core in the axial direction; the lead wire and the star point line are both located at the same end of the stator core in the axial direction as the welding end.

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

11. A vehicle, characterized in that: The motor comprising the motor described in claim 10.

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