Stator winding, stator assembly and motor

Abstract

The utility model relates to a stator winding, a stator assembly and a motor, the stator assembly has three phases and 2p poles, the stator assembly further comprises a stator core, the stator core is provided with Z stator slots, each stator slot is provided with m slot layers, m is an odd number, the stator winding comprises a U-phase winding circuit, a V-phase winding circuit and a W-phase winding circuit, the winding circuit of each phase comprises n winding branches which are connected in parallel; wherein each winding branch performs wave winding layer by layer from a groove layer on the outermost side of the stator groove to a groove layer on the innermost side of the stator groove in the first winding direction, and performs wave winding layer by layer from the groove layer on the innermost side of the stator groove to the groove layer on the outermost side of the stator groove in the second winding direction, or the winding sequence is opposite, and the circulation is performed for Z / 6n times in total. When the three-phase winding provided by the utility model is set to be in odd number layers, compared with the three-phase winding in even number layers, the power can meet the design target while the material cost of the motor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic induction devices, and in particular to a stator winding, a stator assembly and a motor. Background Art

[0002] The driving device of the new energy vehicle can be an electric motor. The core components of the electric motor include a rotor assembly and a stator assembly. The rotor assembly is rotatably arranged in the stator assembly, and the stator assembly includes a stator core and a stator winding wound on the stator core. For a three-phase motor, it includes winding circuits for three phases. According to actual needs, the winding circuit of each phase can also include several parallel winding branches. When the peak current, AC voltage and number of parallel branches of the motor are certain, the number of winding layers determines the peak torque and motor power of the motor. The stator winding of the existing three-phase motor is difficult to take into account the characteristics of low motor material cost and high power at the same time because it is usually set to an even number of layers such as 4, 6, 8, etc. Utility Model Content

[0003] Based on this, the present application provides a stator winding, a stator assembly and a motor to improve the problem that the stator winding of a three-phase motor in the prior art is usually arranged in an even number of layers and it is difficult to take into account the characteristics of low motor material cost and high power at the same time.

[0004] In a first aspect, the present application provides a stator winding, the stator winding is applicable to a stator assembly, the number of phases of the stator assembly is three phases, the number of poles is 2p poles, the stator assembly further comprises a stator core, the stator core is provided with Z stator slots, each of the stator slots is provided with m slot layers, m is an odd number, the stator winding is at least partially arranged in the slot layer of the stator slot, the stator winding comprises a winding circuit of three phases, namely, a U phase, a V phase and a W phase, the winding circuits of the V phase and the W phase are obtained by translating the winding circuit of the U phase by Z / 3p and 2Z / 3p stator slots, respectively, and the winding circuit of each phase comprises n parallel winding branches;

[0005] Each winding branch is wave wound layer by layer from the outermost slot layer of the stator slot to the innermost slot layer of the stator slot along the first winding direction, and is wave wound layer by layer from the innermost slot layer of the stator slot to the outermost slot layer of the stator slot along the second winding direction, and a total of Z / 6n cycles are performed, and the first winding direction is opposite to the second winding direction;

[0006] Alternatively, each winding branch is wave wound layer by layer from the innermost slot layer of the stator slot to the outermost slot layer of the stator slot along the second winding direction, and is wave wound layer by layer from the outermost slot layer of the stator slot to the innermost slot layer of the stator slot along the first winding direction, and the total cycle is Z / 6n times.

[0007] In one embodiment, each winding branch includes a plurality of coils, two coils wound continuously are connected, and the connection point is arranged at the same end of the stator core to form a welding end, and the end of the stator core opposite to the welding end is the crown end, and each winding branch is wound starting from the crown end.

[0008] In one embodiment, each winding branch includes an inlet wire, an outlet wire, a first coil and a second coil. Each winding branch uses the inlet wire as the starting position for winding and performs continuous wave winding with the first coil. When the winding starting position of the winding branch is the outermost side of the stator slot, the winding branch is adjusted from the second winding direction to the first winding direction with the second coil; when the winding starting position of the winding branch is the innermost side of the stator slot, the winding branch is adjusted from the first winding direction to the second winding direction with the second coil.

[0009] In one embodiment, the lead-in line includes an effective lead-in edge, a welding lead-in edge and a twist lead-in edge, wherein the welding lead-in edge and the twist lead-in edge are respectively arranged at two ends of the effective lead-in edge and extend in opposite directions;

[0010] The lead-out line includes a lead-out effective edge, a lead-out welding edge and a lead-out twist edge, wherein the lead-out welding edge and the lead-out twist edge are respectively arranged at two ends of the lead-out effective edge and extend in opposite directions;

[0011] The first coil includes a first effective side, a first welding side and a first twisting side, the first effective side is provided with two, the first welding side corresponds to the first effective side one by one, and the two first welding sides are provided at the same end of the two first effective sides, and the first twisting side is connected between the other ends of the two first effective sides;

[0012] The second coil includes a second effective side, a second welding side and a second twisting side, the second effective side is provided with two, the second welding side corresponds to the second effective side one by one, and the two second welding sides are provided at the same end of the two second effective sides, and the second twisting side is connected between the other ends of the two second effective sides;

[0013] The lead-in effective edge, the lead-out effective edge, the first effective edge and the second effective edge are all arranged in the stator slot, the lead-in wire and the first coil are connected through the lead-in welding edge and the first welding edge, the lead-out wire and the first coil are connected through the lead-out welding edge and the first welding edge, and the second coil and the first coil are connected through the second welding edge and the first welding edge.

[0014] In one of the embodiments, p=4, Z=48, m=7, the seven slot layers of the stator slots are respectively slot layers a, b, c, d, e, f and g, and n=2.

[0015] In one embodiment, the first winding branch of the U phase is:

[0016] 1a-7b-13c-19d-25e-31f-37g-43g-37f-31e-25d-19c-13b-7a-13a-19b-25c-31d-37e-43f-1g-7g-1f-43e-37d-31c-25b-19a -26a-32b-38c-44d-2e-8f-14g-20g-14f-8e-2d-44c-38b-32a-38a-44b-2c-8d-14e-20f-26g-32g-26f-20e-14d-8c-2b-44a;

[0017] The second winding branch of the U phase is:

[0018] 2a-8b-14c-20d-26e-32f-38g-44g-38f-32e-26d-20c-14b-8a-14a-20b-26c-32d-38e-44f-2g-8g-2f-44e-38d-32c-26b-20a -25a-31b-37c-43d-1e-7f-13g-19g-13f-7e-1d-43c-37b-31a-37a-43b-1c-7d-13e-19f-25g-31g-25f-19e-13d-7c-1b-43a.

[0019] In one embodiment, the stator winding further includes a phase copper bar and a star point copper bar, the phase copper bar corresponds to the three phases one by one, and the phase copper bar is connected to the winding starting positions of the n winding branches of the corresponding phase, and the star point copper bar is connected to the winding end positions of a total of 3n winding branches of the three phases.

[0020] In one embodiment, the star point copper busbar includes a copper busbar body and a copper busbar terminal. The copper busbar terminal is arranged on the copper busbar body, and 3n copper busbar terminals are arranged. The 3n copper busbar terminals are respectively connected to the winding end positions of 3n winding branches of three phases in total.

[0021] In a second aspect, the present application provides a stator assembly, which includes any stator winding provided in the present application.

[0022] In a second aspect, the present application provides a motor, characterized in that the motor comprises any one of the stator assemblies provided in the present application.

[0023] The present application can arrange the three-phase winding on the stator core in an odd-numbered winding structure by reasonably setting the winding sequence, winding method and number of windings of the three-phase winding on the stator core. Since the length of the stator core can be reduced by increasing the number of winding turns while ensuring the peak electromagnetic torque of the motor, the present application sets the three-phase winding to an odd number of layers, which can effectively reduce the material cost of the motor; and since the power of the motor increases as the number of winding layers decreases when the AC voltage and the number of parallel branches are given, the present application sets the three-phase winding to an odd number of layers, which can also make it have a higher power. In summary, when the three-phase winding provided by the present application is set to an odd number of layers, compared with the three-phase winding with an even number of layers, it can reduce the material cost of the motor while making the power meet the design target. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a stator assembly to which the stator winding provided in Embodiment 1 of the present application is applicable;

[0025] Figure 2 A schematic diagram of the winding of the stator winding provided in the first embodiment of the present application;

[0026] Figure 3 A schematic diagram of the winding of the U phase of the stator winding provided in the first embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure of the lead-in wire of the stator winding provided in the first embodiment of the present application;

[0028] Figure 5 A schematic diagram of the structure of the lead wires of the stator winding provided in the first embodiment of the present application;

[0029] Figure 6 A schematic diagram of the structure of a first coil of a stator winding provided in Embodiment 1 of the present application;

[0030] Figure 7 A schematic diagram of the structure of the second coil of the stator winding provided in Embodiment 1 of the present application;

[0031] Figure 8 This is a schematic diagram of the slot layers of the stator slots when the winding structure provided in Example 1 of the present application is wound.

[0032] : Figure numerals: 100, stator core; 110, stator slot; 200, lead-in wire; 210, lead-in effective edge; 220, lead-in welding edge; 230, lead-in twist edge; 300, lead-out wire; 310, lead-out effective edge; 320, lead-out welding edge; 330, lead-out twist edge; 400, first coil; 410, first effective edge; 420, first welding edge; 430, first twist edge; 500, second coil; 510, second effective edge; 520, second welding edge; 530, second twist edge; 600, phase copper busbar; 700, star copper busbar; 710, copper busbar body; 720, copper busbar terminal. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0035] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0036] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] Embodiment 1

[0038] Embodiment 1 of the present application provides a stator winding, which is applicable to a stator assembly. The number of phases of the stator assembly is three phases, the number of poles is 2p poles, and the stator assembly further comprises a stator core 100. The stator core 100 is provided with Z stator slots 110, each stator slot 110 is provided with m slot layers, m is an odd number, and the stator winding is at least partially arranged in the slot layer of the stator slot 110. The stator winding comprises winding circuits of three phases in total, namely, a U phase, a V phase and a W phase. The winding circuits of the V phase and the W phase are obtained by translating the winding circuit of the U phase by Z / 3p and 2Z / 3p stator slots 110, respectively, and the winding circuit of each phase comprises n parallel winding branches.

[0039] Each winding branch is wave-wound layer by layer from the outermost slot layer of the stator slot 110 to the innermost slot layer of the stator slot 110 along the first winding direction, and is wave-wound layer by layer from the innermost slot layer of the stator slot 110 to the outermost slot layer of the stator slot 110 along the second winding direction, and a total of Z / 6n cycles are performed, and the first winding direction and the second winding direction are opposite;

[0040] Alternatively, each winding branch is wave wound layer by layer from the innermost slot layer of the stator slot 110 to the outermost slot layer of the stator slot 110 along the second winding direction, and is wave wound layer by layer from the outermost slot layer of the stator slot 110 to the innermost slot layer of the stator slot 110 along the first winding direction, and the total cycle is Z / 6n times.

[0041] like Figure 1 As shown, in this embodiment, it is exemplarily explained that the stator assembly includes a stator core 100 and a stator winding. The stator core 100 can be set in a cylindrical shape, and can include an inner side close to its axis and an outer side away from its axis. Z stator slots 110 can be arranged at equal intervals along the circumferential direction on the inner side of the stator core 100, and the stator winding is partially arranged in the stator slot 110 when it is wound on the stator core 100, that is, the stator winding can be arranged in sequence in m slot layers of the stator slot 110 when it is wound. The stator core 100 is also provided with p pairs of magnetic parts, so that the stator winding is 2p poles. The stator winding is a three-phase winding, that is, the stator winding includes three-phase winding circuits, and the three-phase winding circuits can constitute a three-phase circuit. The three phases can be represented by the marks "U", "V" and "W" respectively; the marks "U", "V" and "W" are only for the convenience of describing the three phases of the stator winding and are not used to limit the stator winding. The marks "U", "V" and "W" can be interchanged arbitrarily.

[0042] In some embodiments, the three phases of the stator winding may also be indicated by other symbols.

[0043] like Figure 1 and Figure 2As shown, in this embodiment, the winding circuit of each phase of the stator winding includes n parallel winding branches, and each winding branch has two winding directions, namely a first winding direction and a second winding direction in opposite directions, and the first winding direction and the second winding direction can both be the circumferential direction of the stator core 100. In this embodiment, the Z stator slots 110 are numbered sequentially, and the serial number is only used to describe the stator slots 110, but not to limit the stator slots 110 in any way. Any stator slot 110 at the circumferential position of the stator core 100 can be used as the stator slot 110 with the serial number "1". In this embodiment, the first winding direction can be the direction along which the serial number of the stator slot 110 increases, and correspondingly, the second winding direction can be the direction along which the serial number of the stator slot 110 decreases.

[0044] During the winding process, each winding branch is wound layer by layer from the outermost slot layer of the stator slot 110 to the innermost slot layer of the stator slot 110 along the first winding direction, or is wound layer by layer from the innermost slot layer of the stator slot 110 to the outermost slot layer of the stator slot 110 along the second winding direction, and the cycle is performed in sequence.

[0045] For example, a winding branch can be wired from the outermost slot layer of the stator slot 110 numbered "r", and wave winding can be performed layer by layer along the first winding direction toward the innermost slot layer of the stator slot 110 numbered "s"; when the winding branch is wound to the innermost side of the stator slot 110 numbered "s", the winding branch can cross several stator slots 110, and then start again from the innermost slot layer of the stator slot 110 numbered "t", and wave winding can be performed layer by layer along the second winding direction toward the outermost layer of the stator slot 110 numbered "o"; then, the winding branch can continue to be wound in a cycle in sequence. Among them, the stator slots 110 numbered "r", "s", "t" and "o" are not equivalent.

[0046] Of course, the winding branch can also enter the wire from the innermost slot layer of the stator slot 110 numbered "r", and wave wind layer by layer along the second winding direction to the outermost slot layer of the stator slot 110 numbered "s"; and when the winding branch is wound to the outermost side of the stator slot 110 numbered "s", the winding branch can be wave wound layer by layer along the first winding direction and across several stator slots 110, from the outermost slot layer of the stator slot 110 numbered "t" to the innermost slot layer of the stator slot 110 numbered "o"; and similarly, the winding branch can then be circularly wound in sequence.

[0047] It is not difficult to see that when the wave winding is performed layer by layer in the first winding direction and the second winding direction and then circulated in sequence, or the wave winding is performed layer by layer in the second winding direction and then circulated in sequence, each cycle of the winding circuit occupies m*2 slot layers, and the Z stator slots 110 have a total of Z*m slot layers, and the stator winding in this embodiment is a three-phase winding, and each phase has n parallel branches, so each winding branch only needs to circulate (Z*m) / (m*2*3*n)=Z / 6n times; in other words, when each winding branch is wave wound once layer by layer in the first winding direction and then the second winding direction, or is wave wound once layer by layer in the second winding direction and then the first winding direction, each winding branch only needs to perform (Z / 6n-1) cycles to fill the slot layers of the Z stator slots 110.

[0048] For example, when p=4, Z=48, m=7, and n=2, the stator winding is a three-phase winding with 48 slots, 8 poles, 2 branches and 7 layers in parallel. At this time, each winding branch needs to be circulated 4 times; and when p=4, Z=72, m=5, and n=3, the stator winding is a three-phase winding with 72 slots, 8 poles, 3 branches and 5 layers in parallel. At this time, each winding branch needs to be circulated 4 times.

[0049] It can be understood that the present application can arrange the three-phase winding on the stator core 100 in an odd-numbered winding structure by reasonably setting the winding sequence, winding method and number of windings of the three-phase winding on the stator core 100. Since the length of the stator core can be reduced by increasing the number of winding turns while ensuring the peak electromagnetic torque of the motor, the present application sets the three-phase winding to an odd number of layers, which can effectively reduce the material cost of the motor; and since the power of the motor increases as the number of winding layers decreases when the AC voltage and the number of parallel branches are given, the present application sets the three-phase winding to an odd number of layers, which can also make it have a higher power. In summary, when the three-phase winding provided by the present application is set to an odd number of layers, compared with the three-phase winding with an even number of layers, it can reduce the material cost of the motor while making the power meet the design target.

[0050] More specifically, each winding branch includes a plurality of coils, two continuously wound coils are connected, and the connection point is arranged at the same end of the stator core 100 to form a welding end, and the end of the stator core 100 opposite to the welding end is the crown end, and each winding branch is wound from the crown end.

[0051] like Figure 2 and Figure 3As shown, in this embodiment, it is exemplified that two coils wound continuously can be welded, and welding tools can be used. The connection points of the two coils wound continuously are both located at the same end of the stator core 100, which can be called the "welding end"; and correspondingly, the other end can be called the "crown end". When the stator winding is wound, each winding branch is wired from the crown end, that is, the winding starting position is located at the crown end.

[0052] Of course, in some embodiments, each winding branch may also be wired in from the welding end.

[0053] It can be understood that, by reasonably setting the line entry position of the three-phase winding, this embodiment can make the welding points of the welding end evenly distributed to facilitate welding; at the same time, it can also reduce the difficulty and cost of preparing welding tooling.

[0054] More specifically, each winding branch includes an introduction wire 200, a lead-out wire 300, a first coil 400 and a second coil 500. Each winding branch uses the introduction wire 200 as the starting position for winding, and performs continuous wave winding with the first coil 400. When the winding starting position of the winding branch is the outermost side of the stator slot 110, the winding branch is adjusted from the second winding direction to the first winding direction with the second coil 500; when the winding starting position of the winding branch is the innermost side of the stator slot 110, the winding branch is adjusted from the first winding direction to the second winding direction with the second coil 500.

[0055] like Figures 4 to 7 As shown, in this embodiment, for example, the lead-in wire 200 and the lead-out wire 300 can be regarded as half of a coil. Since a complete coil needs to be arranged in two stator slots 110, the lead-in wire 200 and the lead-out wire 300 only need to be arranged in one stator slot 110. Each winding branch uses the lead-in wire 200 as the starting position for winding, and the lead-out wire 300 as the ending position for winding. When each winding branch is wave wound, it uses the first coil 400. The pitch of the first coil 400 can be the pole pitch of the winding structure. The pitch of the first coil 400 in this embodiment is 6 slots.

[0056] Taking the winding starting position of the winding branch as the outermost slot layer of the stator slot 110 as an example, when each winding branch adjusts the winding direction, since the stator slot 110 has 7 slot layers and the lead-in wire 200 is only arranged in one of the layers, when the lead-in wire 200 is connected to the first coil 400, only 3 first coils 400 are needed to wind the winding branch from the outermost slot layer of the stator slot 110 to the innermost side of the stator slot 110. Therefore, when the winding branch is adjusted from the first winding direction to the second winding direction, it is only necessary to cross a certain number of stator slots 110 and continue to use the first coil 400 for wave winding. According to the above, when the three first coils 400 are used to continue the wave winding, the winding branch can only be wound from the innermost slot layer of the stator slot 110 to the second-to-last slot layer of the outermost slot of the stator slot 110, but not the outermost slot layer of the stator slot 110, that is, only 6 layers can be wound, so the winding branch needs to use the second coil 500 to adjust the second winding direction to the first winding direction. At this time, the second coil 500 is arranged in the outermost slot layer of two consecutively wound stator slots 110. When the winding branch continues to be wound along the first winding direction, since the second coil 500 has occupied the outermost slot layer of the stator slot 110, the winding branch still needs three first coils 400 to wind the winding branch from the outermost slot layer of the stator slot 110 to the innermost side of the stator slot 110 when it continues to be wound. Then, the winding branch is wound in the same way until the position corresponding to the winding lead wire 300 is reached. It is not difficult to see that when the winding branch is adjusted from the first winding direction to the second winding direction, it only needs to be reversely wound across a plurality of stator slots 110, and at this time, a plurality of first coils 400 are continuously connected; and when the winding branch is adjusted from the second winding direction to the first winding direction, it needs to be completed by the second coil 500, and at this time, the second coil 500 is arranged between the two first coils 400.

[0057] When the winding starting position of the winding circuit is the innermost side of the stator slot, the winding branch is first wound along the second winding direction and then wound along the first winding direction. At this time, the second coil is used to adjust the winding branch from the first winding direction to the second winding direction.

[0058] More specifically, the lead-in line 200 includes an effective lead-in edge 210, an inlet welding edge 220, and an inlet twist edge 230. The inlet welding edge 220 and the inlet twist edge 230 are respectively disposed at two ends of the effective lead-in edge 210 and extend in opposite directions.

[0059] The lead-out line 300 includes a lead-out effective edge 310, a lead-out welding edge 320 and a lead-out twist edge 330. The lead-out welding edge 320 and the lead-out twist edge 330 are respectively arranged at two ends of the lead-out effective edge 310 and extend in opposite directions.

[0060] The first coil 400 includes a first effective side 410, a first welding side 420 and a first twisting side 430. The first effective side 410 is provided with two, the first welding sides 420 correspond to the first effective sides 410 one by one, and the two first welding sides 420 are provided at the same end of the two first effective sides 410, and the first twisting side 430 is connected between the other ends of the two first effective sides 410;

[0061] The second coil 500 includes a second effective side 510, a second welding side 520 and a second twisting side 530. The second effective side 510 is provided with two second welding sides 520 and the second effective sides 510 correspond to each other one by one. The two second welding sides 520 are provided at the same end of the two second effective sides 510. The second twisting side 530 is connected between the other ends of the two second effective sides 510.

[0062] The lead-in effective edge 210, the lead-out effective edge 310, the first effective edge 410 and the second effective edge 510 are all arranged in the stator slot 110, the lead-in wire 200 and the first coil 400 are connected by the lead-in welding edge 220 and the first welding edge 420, the lead-out wire 300 and the first coil 400 are connected by the lead-out welding edge 320 and the first welding edge 420, and the second coil 500 and the first coil 400 are connected by the second welding edge 520 and the first welding edge 420.

[0063] like Figures 3 to 7As shown, in this embodiment, the portion of the coil arranged in the stator slot 110 can be referred to as an effective edge, the lead-in wire 200 and the lead-out wire 300 have only one effective edge, namely, the lead-in effective edge 210 and the lead-out effective edge 310, respectively, while the first coil 400 and the second coil 500 each have two effective edges, namely, the first effective edge 410 and the second effective edge 510. The portion of the coil arranged outside the stator slot 110 can be divided into two parts, one part is located at the welding end, which can be referred to as the welding edge; the other part is located at the crown end, which can be referred to as the twisting edge. The lead-in wire 200 and the lead-out wire 300 have only one welding edge, namely, the lead-in welding edge 220 and the lead-out welding edge 320; the lead-in wire 200 and the lead-out wire 300 also have only one twisting edge, namely, the lead-in twisting edge 230 and the lead-out twisting edge 330. The lead-in welding edge 220 and the lead-in twist edge 230 of the lead-in wire 200 are respectively arranged on both sides of the lead-in effective edge 210, and the lead-out wire 300 can be obtained in the same way. The first coil 400 and the second coil 500 both have two welding edges, and the two welding edges are arranged at the other end of their two effective edges. The two welding edges of the first coil 400 extend obliquely in a direction away from each other, and the two welding edges of the second coil 500 and the second coil 500 extend obliquely in the same direction; the welding edges of the first coil 400 and the second coil 500 are respectively the first welding edge 420 and the second welding edge 520. The first coil 400 and the second coil 500 are both provided with a twist edge, and the other ends of the two effective edges of the first coil 400 and the second coil 500 are connected by the twist edge, that is, the twist edge of the first coil 400 and the second coil 500 is connected between the other ends of the two effective edges, and the twist edge can be set to a "V" shape; the twist edges of the first coil 400 and the second coil 500 are respectively the first twist edge 430 and the second twist edge 530.

[0064] like Figure 3 As shown, during winding, the lead-in wire 200 is connected to a first coil 400, specifically, the lead-in welding edge 220 of the lead-in wire 200 is connected to a first welding edge 420 of the first coil 400. When the first coil 400 is connected to the first coil 400, specifically, the two first welding edges 420 of the two first coils 400 close to each other are connected. The second coil 500 is connected to the first coil 400, specifically, a second welding edge 520 of the second coil 500 is connected to a first welding edge 420 of the first coil 400. Similarly, the lead-out wire 300 is also connected to a first coil 400, specifically, the lead-out welding edge 320 of the lead-out wire 300 is connected to the first welding edge 420 of the first coil 400.

[0065] It can be understood that this embodiment, by reasonably arranging the structures of various coils of the winding structure, makes it easy to implement the winding structure in which the wire is input from the crown end and is continuously wound in a wave winding manner along the first winding direction and the second winding direction.

[0066] More specifically, p=4, Z=48, m=7, the seven slot layers of the stator slot 110 are respectively a, b, c, d, e, f and g slot layers, and n=2.

[0067] like Figure 2 , Figure 3 and Figure 8 As shown, in this embodiment, it is exemplarily explained that this embodiment takes a three-phase winding with 48 slots, 8 poles, 2 branches and 7 layers in parallel as an example. At this time, the winding lines of the V phase and the W phase can be obtained by translating the winding line of the U phase by 4 and 8 stator slots 110 respectively. A total of 7 slot layers a, b, c, d, e, f and g of the stator slot 110 can be arranged in sequence along the direction close to the axis of the stator core 100. The marks "a", "b", "c", "d", "e", "f", "g" and "h" are only for the convenience of describing the slot layers of the stator slot 110, and are not used to limit the stator slot 110.

[0068] In some embodiments, the seven slot layers of the stator slots 110 may also be indicated by other marks.

[0069] More specifically, the first winding branch of phase U is:

[0070] 1a-7b-13c-19d-25e-31f-37g-43g-37f-31e-25d-19c-13b-7a-13a-19b-25c-31d-37e-43f-1g-7g-1f-43e-37d-31c-25b-19a -26a-32b-38c-44d-2e-8f-14g-20g-14f-8e-2d-44c-38b-32a-38a-44b-2c-8d-14e-20f-26g-32g-26f-20e-14d-8c-2b-44a;

[0071] The second winding branch of phase U is:

[0072] 2a-8b-14c-20d-26e-32f-38g-44g-38f-32e-26d-20c-14b-8a-14a-20b-26c-32d-38e-44f-2g-8g-2f-44e-38d-32c-26b-20a -25a-31b-37c-43d-1e-7f-13g-19g-13f-7e-1d-43c-37b-31a-37a-43b-1c-7d-13e-19f-25g-31g-25f-19e-13d-7c-1b-43a.

[0073] like Figure 2 and Figure 3 As shown, in this embodiment, it is exemplarily explained that, taking the first winding branch of the U phase as an example, the winding line "1a" corresponds to the lead-in wire 200, and the lead-in effective edge 210 of the lead-in wire 200 is set in the slot layer a of the stator slot 110 with the serial number "1", referring to Figure 2 and Figure 3 U1 in . It is not difficult to see that the winding starting position of the winding branch in this embodiment is set at the outermost slot layer of the stator slot 110. The winding line "7b-13c" corresponds to a first coil 400, and the two first effective sides 410 of the first coil 400 are respectively set in the b slot layer of the stator slot 110 with the serial number "7" and the c slot layer of the stator slot 110 with the serial number "13", and the pitch of the first coil 400 is 6 slots. Then, the winding lines of "31f-37g" and "43g-37f" correspond to the two first coils 400 when the winding branch is adjusted from the first winding direction to the second winding direction. When the first coil 400 corresponding to the winding line of "31f-37g" is wound around the innermost g slot layer of the stator slot 110 with the serial number "37", it crosses 6 stator slots 110, and the first coil 400 corresponding to the winding line of "43g-37f" continues to be wound along the second winding direction. The winding line of "7a-13a" corresponds to a second coil 500, which is connected to the two first coils 400 corresponding to the winding lines of "19c-13b" and "19b-25c", and the second coil 500 readjusts the winding direction of the winding branch from the second winding direction to the first winding direction; the pitch of the second coil 500 corresponding to the winding line of "7a-13a" is 6 slots. The subsequent winding circuits can be obtained in the same way, where the winding circuits of "19a-26a" and "32a-38a" correspond to the second coil 500, and the pitches are 7 slots and 6 slots respectively. The winding circuit of "44a" corresponds to the lead wire 300, refer to Figure 2 and Figure 3 X1 in.

[0074] The second winding branch of the U phase is similar to the first winding branch of the U phase. The winding starting position and winding end position of the second winding branch of the U phase refer to Figure 2 and Figure 3 U2 and X2 in.

[0075] In this embodiment, the winding lines of the V phase and the W phase can be obtained by translating the winding line of the U phase by 4 and 8 stator slots 110 respectively along the first winding direction, that is, the winding starting positions of the two winding branches of the V phase can be set in the stator slots 110 with serial numbers "5" and "6", referring to Figure 2 V1 and V2 in the figure, and the winding end position refers to Y1 and Y2 in Figure 2; the winding start position of the two winding branches of the W phase is set in the stator slots 110 with serial numbers "9" and "10", refer to Figure 2 The winding end position refers to W1 and W2 in , and the winding end position refers to Z1 and Z2 in 2.

[0076] Of course, in some embodiments, the winding circuits of the V-phase and the W-phase can be obtained by translating the winding circuit of the U-phase by 4 and 8 stator slots 110 respectively along the second winding direction.

[0077] Specifically, the stator winding also includes a phase copper bar 600 and a star point copper bar 700. The phase copper bar 600 corresponds to the three phases one by one, and the phase copper bar 600 is connected to the winding starting positions of the n winding branches of the corresponding phase, and the star point copper bar 700 is connected to the winding end positions of a total of 3n winding branches of the three phases.

[0078] like Figure 1 and Figure 2 As shown, in this embodiment, it is exemplarily explained that three phase copper bars 600 are provided to correspond to the three phases, and the phase copper bars 600 can be connected to the winding starting positions of all winding branches of the corresponding phases. Only one star point copper bar 700 can be provided, and the star point copper bar 700 can be connected to the winding end positions of all winding branches of the three phases. Through the phase copper bars 600 and the star point copper bar 700, the winding circuits of the three phases can form a three-phase circuit, so that the stator winding meets the design and use requirements.

[0079] More specifically, the star point copper busbar 700 includes a copper busbar body 710 and a copper busbar terminal 720 . The copper busbar terminal 720 is disposed on the copper busbar body 710 , and 3n copper busbar terminals 720 are provided. The 3n copper busbar terminals 720 are respectively connected to the winding end positions of 3n winding branches of three phases in total.

[0080] like Figure 1 and Figure 2As shown, in this embodiment, it is exemplarily explained that the phase copper bar 600 can be set to a rectangular shape and can be parallel to the axis of the stator core 100. The two sides of the length direction of the phase copper bar 600 can be arranged between the starting positions of the two winding branches of the corresponding phase, and connected to the winding starting positions of the two winding branches. The phase copper bar 600 can also be provided with an extension section to facilitate the lead-out and connection with the connecting wires of components such as the motor controller, that is, the phase copper bar 600 can be extended. The copper bar body 710 can be set to an arc shape and can be set in a plane perpendicular to the axis of the stator core 100. The copper bar terminal 720 is provided with 6 to connect to the winding end position of the 6 winding branches of the three phases.

[0081] It can be understood that this embodiment reasonably arranges the structure of the phase copper bar 600 and the star point copper bar 700, so that the winding line can be connected into a three-phase circuit through the phase copper bar 600 and the star point copper bar 700 with relatively simple structures, so that the winding structure meets the use requirements.

[0082] The implementation principle of a stator winding provided in the first embodiment of the present application is:

[0083] When the stator winding is wound, the winding starting position of the first winding branch of the U phase is to enter the wire from the outermost slot layer of the stator slot 110 with the serial number "1", and to be wound layer by layer along the first winding direction to the innermost slot layer of the stator slot 110 with the serial number "7"; when the winding branch is wound to the innermost side of the stator slot 110 with the serial number "37", the winding branch can span 6 stator slots 110, and then start again from the innermost slot layer of the stator slot 110 with the serial number "43", and to be wound layer by layer along the second winding direction to the outermost layer of the stator slot 110 with the serial number "7"; and the cycle is repeated in sequence. When winding, the winding branches all use the lead-in wire 200 as the winding starting position, the lead-out wire 300 as the winding end position, and the first coil 400 is wave wound at the same time, and the second coil 500 is adjusted from the second winding direction to the first winding direction. Similarly, the second winding branch of the U phase can be obtained by winding in the same way. Then the winding lines of the V phase and the W phase are wound, and then the phase copper bar 600 and the star point copper bar 700 are connected to the winding lines of the three phases.

[0084] The present application can arrange the three-phase winding on the stator core 100 in an odd-numbered winding structure by reasonably setting the winding sequence, winding method and number of windings of the three-phase winding on the stator core 100. Since the length of the stator core can be reduced by increasing the number of winding turns while ensuring the peak electromagnetic torque of the motor, the present application sets the three-phase winding to an odd number of layers, which can effectively reduce the material cost of the motor; and since the power of the motor increases as the number of winding layers decreases when the AC voltage and the number of parallel branches are given, the present application sets the three-phase winding to an odd number of layers, which can also make it have a higher power. In summary, when the three-phase winding provided by the present application is set to an odd number of layers, compared with the three-phase winding with an even number of layers, it can reduce the material cost of the motor while making the power meet the design target.

[0085] Embodiment 2

[0086] Embodiment 2 of the present application provides a stator assembly, and the stator assembly includes any winding structure provided in the present application.

[0087] Embodiment 3

[0088] Embodiment 3 of the present application provides a motor, which includes any stator assembly provided in the present application.

[0089] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A stator winding, characterized in that: The stator winding is suitable for a stator assembly, the number of phases of the stator assembly is three phases, the number of poles is 2p poles, the stator assembly further comprises a stator core (100), the stator core (100) is provided with Z stator slots (110), each of the stator slots (110) is provided with m slot layers, m is an odd number, the stator winding is at least partially arranged in the slot layers of the stator slots (110), the stator winding comprises winding circuits of three phases in total, namely, a U phase, a V phase and a W phase, the winding circuits of the V phase and the W phase are obtained by translating the winding circuit of the U phase by Z / 3p and 2Z / 3p stator slots (110), respectively, and the winding circuit of each phase comprises n parallel winding branches; Each winding branch is wave wound layer by layer from the outermost slot layer of the stator slot (110) to the innermost slot layer of the stator slot (110) along a first winding direction, and is wave wound layer by layer from the innermost slot layer of the stator slot (110) to the outermost slot layer of the stator slot (110) along a second winding direction, and a total of Z / 6n cycles are performed, and the first winding direction and the second winding direction are opposite; Alternatively, each winding branch is wave wound layer by layer from the innermost slot layer of the stator slot (110) to the outermost slot layer of the stator slot (110) along the second winding direction, and is wave wound layer by layer from the outermost slot layer of the stator slot (110) to the innermost slot layer of the stator slot (110) along the first winding direction, and the total number of cycles is Z / 6n times.

2. The stator winding according to claim 1, characterized in that: Each winding branch includes a plurality of coils, two coils that are wound continuously are connected, and the connection point is arranged at the same end of the stator core (100) to form a welding end, and the end of the stator core (100) that is arranged opposite to the welding end is a crown end, and each winding branch is wound starting from the crown end.

3. The stator winding according to claim 2, characterized in that: Each winding branch comprises an inlet wire (200), an outlet wire (300), a first coil (400) and a second coil (500); each winding branch uses the inlet wire (200) as a winding starting position and performs continuous wave winding with the first coil (400); when the winding starting position of the winding branch is the outermost side of the stator slot (110), the winding branch adjusts the second winding direction to the first winding direction with the second coil (500); when the winding starting position of the winding branch is the innermost side of the stator slot (110), the winding branch adjusts the first winding direction to the second winding direction with the second coil (500).

4. The stator winding according to claim 3, characterized in that: The lead-in line (200) comprises an effective lead-in edge (210), an inlet welding edge (220) and an inlet twisting edge (230), wherein the inlet welding edge (220) and the inlet twisting edge (230) are respectively arranged at two ends of the effective lead-in edge (210) and extend in opposite directions; The lead-out line (300) comprises a lead-out effective edge (310), a lead-out welding edge (320) and a lead-out twist edge (330), wherein the lead-out welding edge (320) and the lead-out twist edge (330) are respectively arranged at two ends of the lead-out effective edge (310) and extend in opposite directions; The first coil (400) comprises a first effective side (410), a first welding side (420) and a first twisting side (430); the first effective side (410) is provided with two, the first welding side (420) corresponds to the first effective side (410) one by one, and the two first welding sides (420) are provided at the same end of the two first effective sides (410); the first twisting side (430) is connected between the other ends of the two first effective sides (410); The second coil (500) comprises a second effective side (510), a second welding side (520) and a second twisting side (530); the second effective side (510) is provided with two, the second welding side (520) corresponds to the second effective side (510) one by one, and the two second welding sides (520) are provided at the same end of the two second effective sides (510); the second twisting side (530) is connected between the other ends of the two second effective sides (510); The lead-in effective edge (210), the lead-out effective edge (310), the first effective edge (410) and the second effective edge (510) are all arranged in the stator slot (110); the lead-in wire (200) and the first coil (400) are connected via the lead-in welding edge (220) and the first welding edge (420); the lead-out wire (300) and the first coil (400) are connected via the lead-out welding edge (320) and the first welding edge (420); and the second coil (500) and the first coil (400) are connected via the second welding edge (520) and the first welding edge (420).

5. The stator winding according to claim 4, characterized in that: p=4, Z=48, m=7, the 7 slot layers of the stator slot (110) are respectively slot layers a, b, c, d, e, f and g, and n=2.

6. The stator winding according to claim 5, characterized in that: The first winding branch of the U phase is: 1a-7b-13c-19d-25e-31f-37g-43g-37f-31e-25d-19c-13b-7a-13a-19b-25c-31d-37e-43f-1g-7g-1f-43e-37d-31c-25b-19a -26a-32b-38c-44d-2e-8f-14g-20g-14f-8e-2d-44c-38b-32a-38a-44b-2c-8d-14e-20f-26g-32g-26f-20e-14d-8c-2b-44a; The second winding branch of the U phase is: 2a-8b-14c-20d-26e-32f-38g-44g-38f-32e-26d-20c-14b-8a-14a-20b-26c-32d-38e-44f-2g-8g-2f-44e-38d-32c-26b-20a -25a-31b-37c-43d-1e-7f-13g-19g-13f-7e-1d-43c-37b-31a-37a-43b-1c-7d-13e-19f-25g-31g-25f-19e-13d-7c-1b-43a.

7. The stator winding according to claim 1, characterized in that: The stator winding further comprises a phase copper bar (600) and a star point copper bar (700), wherein the phase copper bar (600) corresponds to the three phases one by one, and the phase copper bar (600) is connected to the winding starting positions of the n winding branches of the corresponding phase, and the star point copper bar (700) is connected to the winding ending positions of a total of 3n winding branches of the three phases.

8. The stator winding according to claim 7, characterized in that: The star point copper busbar (700) comprises a copper busbar body (710) and a copper busbar terminal (720), wherein the copper busbar terminal (720) is arranged on the copper busbar body (710), and 3n copper busbar terminals (720) are arranged, and the 3n copper busbar terminals (720) are respectively connected to the winding end positions of 3n winding branches of three phases in total.

9. A stator assembly, characterized in that: The stator assembly comprises the stator winding according to any one of claims 1 to 8.

10. A motor, characterized in that: The electric machine comprises the stator assembly according to claim 9.

Images