Stator assembly, method for winding windings of stator assembly, motor, and vehicle

Abstract

Stator assembly, method for winding windings of stator assembly, motor, and vehicle. The stator assembly is applicable to a z-slot 2p-stage m-phase motor. The stator assembly comprises a stator core and stator windings. The stator core has stator slots spaced apart in the circumferential direction, and each stator slot has multiple slot layers arranged radially. The stator windings comprise multiple conductor sections, each conductor section comprising a first type of conductor section, where two slot-in-slot portions of the first type of conductor section are respectively located in adjacent slot layers of the stator slot, both located in intermediate slot layers, and the span of the first type of conductor section is y-1 stator slots.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle electromechanics, and more particularly, to a stator assembly, a winding method for a winding of the stator assembly, a motor, and a vehicle.

[0002] Background Art In the design of electromechanical windings, an arrangement in which the electrical distances between individual coils of the same phase are not equal can effectively improve the uniformity of the magnetic field distribution of the electromechanical device and increase the torque and output of the electromechanical device. However, such an arrangement may also cause an increase in the electromagnetic noise and vibration of the electromechanical device, and may also increase the harmonic distortion of the electromechanical device, affecting the stability and reliability of the electromechanical device. How to design the windings of an electromechanical device to improve its overall performance is a problem currently faced by the industry.

[0003] Summary of the Invention A selection of concepts in simplified form is introduced in the summary section, which is further described in detail in the detailed description section. The summary section of the present disclosure is not intended to define the important and essential features of the claimed subject matter, nor is it intended to determine the scope of protection of the claimed subject matter.

[0004] To at least partially address the above problems, a first aspect of the present disclosure provides a stator assembly applicable to a z-slot 2p-step m-phase motor, the stator assembly comprising a stator core having z stator slots arranged at intervals along the circumferential direction, each stator slot having a plurality of slot layers arranged in the radial direction, the stator core; a stator winding including a plurality of conductor portions, the plurality of conductor portions including a first type of conductor portion, wherein two slot inner portions of each of the first type of conductor portions are located in adjacent slot layers respectively, and having a span of y - 1 stator slots, the first type of conductor portion Each of the two slot portions of the first type of conductor section is located in an intermediate slot layer between the radially outermost slot layer and the radially innermost slot layer, and includes a stator winding where y is an integer and y = z / 2p.

[0005] In one embodiment, the plurality of conductor parts are A second type of conductor, comprising two slot portions of the second type of conductor located within the radially outermost slot layer, a first connecting end of the second type of conductor connected to a second connecting end of one of the first type of conductors, and a second connecting end of the second type of conductor connected to a first connecting end of another of the first type of conductors.

[0006] In one embodiment, the plurality of conductor parts are A third type of conductor, comprising two slot-in-slot portions of the third type of conductor, which are located in the radially innermost slot layer and have a span of y stator slots.

[0007] The first connection end of the third type of conductor is connected to the second connection end of the first type of conductor, and the second connection end of the third type of conductor is connected to the first connection end of the first type of conductor.

[0008] In one embodiment, the stator winding of each phase includes a plurality of first type conductors, second type conductors, and third type conductors.

[0009] The multiple conductor sections of the stator windings for each phase are located within the stator core. Two adjacent conductor sections are located in different slot layers and differ by y stator slots in the circumferential direction. The conductors are arranged starting from the radially outermost slot layer of the first slot and toward the radially innermost slot layer of the last slot, with the kM+1th conductor to the (k+1 / 2)M+1th conductor being arranged to span along the first circumferential direction. The (k+1 / 2)M+2th conducting section to the (k+1)Mth conducting section are arranged to span along a second circumferential direction opposite to the first circumferential direction. The (k+1 / 2)M+2th conducting portion and the (k+1 / 2)M+1th conducting portion differ by y stator slots in the second circumferential direction, and the (k+1)M+1th conducting portion and the (k+1)Mth conducting portion differ by y stator slots in the second circumferential direction, M is the number of slot layers in the stator slots, k ≥ 0, and k is an integer. It is composed as follows.

[0010] In one embodiment, the second type of conductor portion includes a first sub-conductor portion spanning y+1 stator slots and a second sub-conductor portion spanning y-2 stator slots.

[0011] In one embodiment, two first subconducting sections are arranged between two adjacent second subconducting sections.

[0012] The number of slots per stage per phase is q = z / (2p) / m = 3.

[0013] In one embodiment, the number of stator slots is 54, 72, or 90, and / or The number of slot layers for each stator slot is 6, 8, or 10.

[0014] In one embodiment, the cross-sectional shape of the conductor portion in a direction perpendicular to the extending direction of the conductor portion is rectangular.

[0015] In one embodiment, the stator winding includes a three-phase winding, where each phase of the stator winding includes one coil, a lead wire, and a neutral point wire for each phase of the stator winding, differing by y stator slots in the circumferential direction.

[0016] In one embodiment, the stator winding includes three phase windings, which are A-phase winding, B-phase winding, and C-phase winding, where the lead wires of the A-phase winding and the lead wires of the B-phase winding differ by z / 12 stator slots in the circumferential direction, and the lead wires of the A-phase winding and the lead wires of the C-phase winding differ by z / 6 stator slots in the circumferential direction.

[0017] In one embodiment, the stator winding includes a three-phase winding, and each phase stator winding includes n branches connected in parallel, where n is an integer of 2 or more. Each lead wire of any two adjacent branches of the stator winding of each phase differs by z / n stator slots in the circumferential direction. The leader lines and neutral dot lines of each branch differ by z / ny stator slots in the circumferential direction.

[0018] In one embodiment, the stator winding of each phase includes four branches connected in parallel, and the lead wires of two adjacent branches of the four branches differ by z / 4 stator slots in the circumferential direction.

[0019] In one embodiment, the stator winding includes three phase windings, A-phase winding, B-phase winding, and C-phase winding, wherein the lead wires of one branch of the A-phase winding and the lead wires of the corresponding branch of the B-phase winding differ by z / 12 stator slots in the circumferential direction, and the lead wires of the branch of the A-phase winding and the lead wires of the corresponding branch of the C-phase winding differ by z / 6 stator slots in the circumferential direction.

[0020] In one embodiment, the stator slots include a first type of stator slot and a second type of stator slot. Conductors placed in the first type of stator slot belong to the same phase winding, while conductors placed in the second type of stator slot belong to two different phase windings. The number of conductors belonging to the windings of two different phases in the second type of stator slot is not equal.

[0021] A second aspect of the present disclosure provides a method of winding a winding of a stator assembly, the stator assembly being applicable to a z-slot 2p-step m-phase motor, the stator assembly comprising a stator core having z stator slots arranged at intervals along the circumferential direction, each stator slot having a plurality of slot layers arranged in the radial direction, a stator winding including a plurality of conductor portions, the plurality of conductor portions including a first type of conductor portion, two slot inner portions of each of the first type of conductor portions being located in adjacent slot layers respectively, and having a span of y-1 stator slots, two slot inner portions of each of the first type of conductor portions being in an intermediate slot layer between the radially outermost slot layer and the radially innermost slot layer, y being an integer and y = z / 2p, and a stator winding. The winding method of the stator winding of each phase includes the step of connecting a first type of conductor portion as a part of the stator winding.

[0022] In one embodiment, the plurality of conductor portions of the stator winding include a second type of conductor portion, two slot inner portions of the second type of conductor portion being in the radially outermost slot layer, a first connection end portion of the second type of conductor portion being connected to a second connection end portion of one of the first type of conductor portions, and a second connection end portion of the second type of conductor portion being connected to a first connection end portion of another one of the first type of conductor portions, and a third type of conductor portion, two slot inner portions of the third type of conductor portion being in the radially innermost slot layer, having a span of y stator slots, a first connection end portion of the third type of conductor portion being connected to a second connection end portion of one of the first type of conductor portions, and a second connection end portion of the third type of conductor portion being connected to a first connection end portion of another one of the first type of conductor portions. The winding method of the stator winding of each phase includes the following steps.

[0023] Step 1: A step of connecting a lead wire to a conductor part of the second type in the first slot, wherein the conductor part of the second type in the first slot is arranged to span along the first circumferential direction.

[0024] Step 2: Starting from the conductor part of the second type in the previous step, along the first circumferential direction from the radially outermost slot layer (113) to the radially innermost slot layer (115), after the conductor part of the first type in the second radially innermost slot layer (116) spans y stator slots (111) along the first circumferential direction, it is connected to the conductor part of the third type in the radially innermost slot layer (115). A step of connecting to the conductor part of the first type arranged in the adjacent slot layer (112) by spanning every y stator slots (111), wherein the conductor part of the third type is arranged to span along the first circumferential direction.

[0025] Step 3: Starting from the conductor part of the third type in the previous step, from the radially innermost slot layer to the radially outermost slot layer, along the second circumferential direction opposite to the first circumferential direction, until it is connected to the conductor part of the second type arranged in the first circumferential direction in the radially outermost slot layer. A step of connecting to the conductor part of the first type arranged in the adjacent slot layer by spanning every y stator slots, wherein each conductor part of the first type is arranged to span along the second circumferential direction, and the conductor part of the second type is arranged to span along the first circumferential direction.

[0026] Step 4: A step of switching the spanning direction of the conductor part to the first circumferential direction starting from the second conductor part of the second type of conductor part.

[0027] Step 5: A step of repeating Steps S2 to S4 until reaching the conductor part of the first type located in the second radially outermost slot layer of the final slot.

[0028] Step 6: Connect the neutral dot wire to the first type of conductor located in the second outermost slot layer in the radial direction of the final slot.

[0029] A third aspect of the present disclosure is a motor comprising a rotor and a stator assembly according to a first aspect of the present disclosure, and provides a method for winding the windings of the stator assembly according to a second aspect of the present disclosure.

[0030] A fourth aspect of this disclosure provides a vehicle equipped with an electromechanism according to a third aspect of this disclosure.

[0031] The following drawings of embodiments of this disclosure are included herein as part of this disclosure to help understand this disclosure. The drawings illustrate embodiments and descriptions of this disclosure to help illustrate the principles of this disclosure. [Brief explanation of the drawing]

[0032] [Figure 1] This is a schematic diagram of the three-dimensional structure of a stator assembly according to a preferred embodiment of the present disclosure. [Figure 2] This is a schematic diagram showing the distributed structure of the winding conductor portion of a stator assembly according to a preferred embodiment of the present disclosure, the motor being a 72-slot, 8-stage, 3-phase motor. [Figure 3] Figure 2 is a schematic diagram showing the first configuration of the A-phase, B-phase, and C-phase windings in the embodiment, where each phase stator winding includes a single-circuit coil. [Figure 4] Figure 2 is a schematic diagram showing the first configuration of the A-phase, B-phase, and C-phase windings in the embodiment, where each phase stator winding includes a single-circuit coil. [Figure 5] Figure 2 is a schematic diagram showing the first configuration of the A-phase, B-phase, and C-phase windings in the embodiment, where each phase stator winding includes a single-circuit coil. [Figure 6] Figure 2 is a schematic diagram showing a second configuration of the insulating paper in the stator slot of the embodiment. [Figure 7]Figure 2 is a schematic diagram showing the second configuration of the A-phase, B-phase, and C-phase windings in the embodiment, where each phase of the stator winding has two parallel branches. [Figure 8] Figure 2 is a schematic diagram showing the second configuration of the A-phase, B-phase, and C-phase windings in the embodiment, where each phase of the stator winding has two parallel branches. [Figure 9] Figure 2 is a schematic diagram showing the second configuration of the A-phase, B-phase, and C-phase windings in the embodiment, where each phase of the stator winding has two parallel branches. [Figure 10] Figure 2 is a schematic diagram showing the third configuration of the A, B, and C phase windings in the embodiment, with each phase of the stator winding having four parallel branches. [Figure 11] Figure 2 is a schematic diagram showing the third configuration of the A, B, and C phase windings in the embodiment, with each phase of the stator winding having four parallel branches. [Figure 12] Figure 2 is a schematic diagram showing the third configuration of the A, B, and C phase windings in the embodiment, with each phase of the stator winding having four parallel branches. [Explanation of Symbols]

[0033] 100 Stator Assembly 110 stator core 111 stator slots 112 slot layers 113 Radial outermost slot layer 114 Intermediate slot layer 115 Radial innermost slot layer 116 The second innermost slot layer in the radial direction 117 The second outermost slot layer in the radial direction 118 First type stator slot 119 Second type of stator slot 120 Stator winding 121 Bent part 122 Connection end 123 Slot interior 124 Conductor section 130 Leader wire assembly 131 A phase terminal 132 B phase terminal 133 C phase terminal 140 Insulating paper 141 Partition section 142 Containment Space D1 First circumferential direction D2 Second circumferential direction D3 Axis [Modes for carrying out the invention]

[0034] The following description includes numerous specific details to provide a complete understanding of the disclosure. However, it will be apparent to those skilled in the art that embodiments of the disclosure can be implemented without these specific details. In other embodiments, well-known technical features in the art are not described in detail to avoid confusion with embodiments of the disclosure.

[0035] To fully understand the embodiments of this disclosure, detailed structures are presented in the following description. Clearly, the embodiments of the embodiments of this disclosure are not limited to specific details well known to those skilled in the art. Preferred embodiments of this disclosure are described in detail below, but this disclosure may have other embodiments in addition to these detailed descriptions and should not be construed as being limited to the embodiments described herein.

[0036] The terms used herein are for illustrative purposes only and not to limit any particular embodiment. This disclosure is not intended to limit any part of the invention. It should be understood that the singular forms “a,” “an,” and “the” are intended to include the plural form unless the context clearly indicates otherwise. The terms “equip,” “include,” where used herein, specify the presence of a described feature, integer, step, action, element, and / or component, but do not exclude the presence or addition of one or more other features, integers, steps, actions, elements, components, and / or groups thereof. The terms “top,” “bottom,” “front,” “rear,” “left,” “right,” and similar expressions are used in this disclosure for illustrative purposes only and not to limit any part of the invention.

[0037] The ordinal numbers such as “First” and “Second” as used in this disclosure are merely identifiers and do not have any other meaning, such as a specific order. Furthermore, for example, the term “First Part” does not in itself imply the existence of “Second Part,” and the term “Second Part” does not in itself imply the existence of “First Part.”

[0038] In this disclosure, unless otherwise specified and limited, the terms “mounting,” “connected,” and “connection” should be understood broadly, including, for example, being mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or internal communication between two elements, such as being permanently connected, detachably connected, or integrally connected. A person skilled in the art will understand the specific meaning of the above terms in this disclosure in accordance with the specific circumstances.

[0039] The following describes typical embodiments of the present disclosure, and these embodiments will be explained in more detail with reference to drawings that are not limiting to the present disclosure.

[0040] This disclosure discloses a stator assembly, a method for winding the windings of the stator assembly, a motor, and a vehicle. To facilitate understanding of the technical solutions, we first refer to a stator assembly 100 according to an embodiment of the present disclosure described with reference to Figures 1 to 12. Here, the stator assembly 100 of the embodiment of the present disclosure can be used in a z-slot 2p-stage m-phase motor, where the slot numbers for each stage and each phase are q = z / (2p) / m, m = 1, 2, 3… That is, the stator assembly 100 can be used in a one-phase motor, a two-phase motor, a three-phase motor, and so on.

[0041] In the following, we will only use three-phase motors as examples for illustrative purposes, but of course, those skilled in the art will understand after reading the following technical solutions that m-phase motors are other-phase motors, and therefore will not repeat them here.

[0042] As shown in Figure 1, the stator assembly 100 of the embodiment of the present disclosure comprises a stator core 110 and a stator winding 120.

[0043] Specifically, the stator core 110 is cylindrical and has a plurality of stator slots 111. The stator slots 111 are formed in the inner circumferential wall of the stator core 110 and penetrate the stator core 110 along the axial direction D3. The depth direction of the stator slots 111 coincides with the radial direction of the stator core 110. The plurality of stator slots 111 are spaced apart along the circumferential direction of the stator core 110.

[0044] Each stator slot 111 has M slot layers 112 arranged radially, where M is 4 or more. Preferably, M is an even number greater than or equal to 4. The "outermost slot layer 113" and "innermost slot layer 115" described below specifically refer to the innermost slot layer 115 and outermost slot layer 113 of the stator slot 111 from the inside to the outside along the radial direction of the stator core 110, with the innermost slot layer 115 being closer to the central axis of the stator core 110. The slot layers 112 between the outermost slot layer 113 and the innermost slot layer 115 are intermediate slot layers 114.

[0045] The stator winding 120 comprises a plurality of conductor sections 124. Specifically, each conductor section 124 is U-shaped and has a bent portion 121 and two slotted portions 123 connected to the bent portion 121. Of these, the two slotted portions 123 of each conductor section 124 are located in different stator slots 111, and after passing through the corresponding stator slots 111, the two slotted portions 123 of each conductor section 124 extend beyond the stator core 110 to form two connecting ends 122.

[0046] In one embodiment of the present disclosure, the plurality of conductor portions 124 constituting the stator winding 120 consist of three types: a first type of conductor portion, a second type of conductor portion, and a third type of conductor portion.

[0047] Of these, the first type of conductor portion is located in the intermediate slot layer 114 between the radially outermost slot layer 113 and the radially innermost slot layer 115. The first type of conductor portion is positioned across adjacent slot layers, and its span is y-1 stator slots 111. Specifically, the span is the span between two slot portions 123 of the conductor portion. In other words, the two slot portions 123 of the first type of conductor portion are each located within two adjacent intermediate slot layers 114, and their spacing is y-1 stator slots 111. Therefore, the number of intermediate slot layers 114 between the radially outermost slot layer 113 and the radially innermost slot layer 115 is at least 2.

[0048] The second type of conductor portion is located in the radially outermost slot layer 113. The second type of conductor portion is positioned beyond the same slot layer. In other words, both of the two slot portions 123 of the second type of conductor portion are located within the radially outermost slot layer 113. Specifically, in one embodiment of the present disclosure, the second type of conductor portion comprises a first sub-conductor portion having a span of y+1 stator slots 111 and a second sub-conductor portion having a span of y-2 stator slots 111.

[0049] The third type of conductor is positioned across the same slot layer. Specifically, the third type of conductor is positioned in the radially innermost slot layer 115 of the stator slots 111, with a span of y stator slots 111. In other words, both slot portions 123 of the third type of conductor are located within the radially innermost slot layer 115.

[0050] In this case, y is an integer, and y = z / 2p, where 2p is the row number.

[0051] In this embodiment, the conductor portion 124 has one bent portion 121 and two connecting ends 122. The two connecting ends 122 of each conductor portion 124 are a first connecting end and a second connecting end, respectively, with the first connecting end located upstream of the second connecting end along the winding direction of the winding 120. In this embodiment, the first connecting end of a second type of conductor portion is connected to the second connecting end of a first type of conductor portion, and the second connecting end of a second type of conductor portion is connected to the first connecting end of another first type of conductor portion. The first connecting end of each third type of conductor portion is connected to the second connecting end of a first type of conductor portion, and the second connecting end of a third type of conductor portion is connected to the first connecting end of another first type of conductor portion.

[0052] It is understood that the conductor portion 124 forms a winding by connecting its ends together.

[0053] Specifically, in combination with Figures 2 to 5, each phase stator winding 120 includes a plurality of first type conductor sections, a second type conductor section, and a third type conductor section. The structure in which individual conductor sections 124 are arranged and connected within the stator core 110 is such that the second type conductor section is connected to the third type conductor section via the first type conductor section, and two adjacent conductor sections 124 are located in different slot layers, differing by y stator slots 111 in the circumferential direction of the stator core 110.

[0054] The lead wires of the stator windings 120 of each phase are connected to one connection end 122 of the second type of conductor section in the first slot, and the second type of conductor section is arranged to straddle the first circumferential direction D1.

[0055] From the first stator slot 111, the kM+1th conductor portion 124 to the (k+1 / 2)M+1th conductor portion 124 are arranged to span along the first circumferential direction D1, where k≧0 and k is an integer. In other words, the conductor portion 124 is arranged to span along the first circumferential direction D1, from the radially outermost slot layer 113 to the radially innermost slot layer 115. Two adjacent conductor portions 124 also differ by y stator slots 111 in the first circumferential direction D1 and are located in different slot layers 112. When there are two conductor portions of the first type, it is understood that the four slot portions 123 of the two conductor portions of the first type are each located in four different intermediate slot layers 114.

[0056] The conductors 124 from the (k+1 / 2)M+2th to the (k+1)Mth conductors 124 are arranged to straddle the second circumferential direction D2 opposite to the first circumferential direction D1, such that k≧0 and k is an integer. In other words, during the winding process from the radially innermost slot layer 115 to the radially outermost slot layer 113, the conductors 124 in the intermediate slot layer 114 are arranged to straddle the second circumferential direction D2.

[0057] Correspondingly, during the winding process from the radially innermost slot layer 115 to the radially outermost slot layer 113, two adjacent conductor sections 124 are also separated by y stator slots 111 in the second circumferential direction D2. The (k+1 / 2)M+2th conductor section 124 and the (k+1 / 2)M+1th conductor section 124 are separated by y stator slots 111 in the second circumferential direction D2, and the (k+1)M+1th conductor section 124 and the (k+1)Mth conductor section 124 are separated by y stator slots 111 in the second circumferential direction D2.

[0058] The connecting end 122 of the first type of conductor section of the second innermost slot layer 116 in the radial direction of the final stator slot 111 is connected to the neutral dot line of the phase stator winding 120.

[0059] In conventional technology, stator assemblies are mostly wound with full-pitch windings; that is, the innermost slot layer, intermediate slot layer, and outermost slot layer of the stator core have conductors with a span of y, where y = z / 2p, and z is the number of stator slots and 2p is the number of stages in the stator assembly. As a result, the stator assembly can generate current circulation, leading to problems of voltage imbalance and power imbalance. Furthermore, each slot layer within the same stator slot of the stator core has conductors with the same phase, making it impossible to remove the 5th and 7th harmonics of the magnetic field, and thus the 6p-order torque ripple of the motor cannot be suppressed, resulting in high 6p-order vibration noise of the motor.

[0060] The stator assembly 100 of this disclosure employs short-pitch stator windings. The span of the conductor portion 124 located in the intermediate slot layer 114 of the stator slot 111 is y-1, which is different from the span of the conductor portion 124 in the innermost slot layer 115. Therefore, the conductor portions 124 within the same stator slot 111 belong to different phase windings, and according to electromagnetic theory, the 5th and 7th harmonics of the magnetic field can be better removed. Experiments have shown that a motor having the stator assembly 100 of this disclosure can remove more than 80% of the 5th and 7th harmonics of the air gap magnetic field and has very low 6p-order vibration noise.

[0061] When the motor of this disclosure has 8 stages (2p), it can be seen that 24th-order torque fluctuations can be suppressed, and correspondingly, 24th-order vibration noise can be reduced. When the motor of this disclosure has 6 stages (2p), 18th-order torque fluctuations can be suppressed, and correspondingly, 18th-order vibration noise can be reduced.

[0062] The positions of the first and last slots of the stator winding 120 for each phase can be determined according to the actual circumstances. For example, the positions can be determined according to the motor design parameters. Preferably, if the stator winding for each phase contains only a single circuit coil, the first and last slots can be arranged so that they are spaced apart by y stator slots 111 in the circumferential direction. If the stator winding for each phase contains multiple branches, the first and last slots of each branch can be arranged according to the distribution of each branch.

[0063] According to the stator assembly 100 of this disclosure, the second type of conductor portion may be one type with a fixed span value, or it may be multiple types with different span values.

[0064] In a particular embodiment of the present disclosure, the stator winding of each phase occupies three stator slots 111 in each stage, i.e., q = z / (2p) / m = 3. The second type of conductor section includes two types with different spans.

[0065] Specifically, the second type of conductor section includes a first sub-conductor section having a span of y+1 stator slots 111 and a second sub-conductor section having a span of y-2 stator slots 111. In each phase stator winding, two first sub-conductor sections are arranged between two adjacent second sub-conductor sections. In other words, along the extension direction of each phase stator winding, the arrangement rule for the two types of second type conductor sections is first sub-conductor section - first sub-conductor section - second sub-conductor section.

[0066] It can be understood that an adjacent second type of conductor section refers to a situation where, in the winding direction of the stator windings of each phase, there are no other second type of conductor sections between the two second type of conductor sections.

[0067] In the staggered arrangement, the stator slots 111 of each phase's stator winding include two types of first and second stator slots. The M conductor sections 124 located in the first stator slots all belong to the same phase stator winding, while the M conductor sections 124 located in the M slot layers of the second stator slots each belong to two different phase stator windings. This further enhances the effect of removing fifth and seventh harmonics and reducing sixth-order vibration noise.

[0068] It should be understood that the number of slots per stage per phase can be adjusted according to the actual conditions. For example, the number of slots per stage per phase can be set to 2, or to a value greater than 3, such as 4, 5, or 6. Those skilled in the art can make adjustments according to the actual conditions to improve the performance of the motor.

[0069] Preferably, the number of stator slots 111 can be 54, 72, or 90. For example, if the number of slots per stage per phase is 3, the stator assembly 100 can be applied to a 6-stage, 54-slot three-phase motor, an 8-stage, 72-slot three-phase motor, or a 10-stage, 90-slot three-phase motor.

[0070] Preferably, the number of slot layers in each stator slot 111 (number of slot layers 112) can be 6, 8, or 10. The number of slot layers in the stator slot 111 can be selected according to the design power, rotational speed, number of stator coils, and magnetic density of the motor. The more slot layers in the stator slot 111 there are, the higher the power density and efficiency of the motor. By controlling the number of slot layers in the stator slot 111 while ensuring motor performance, manufacturing difficulty and manufacturing costs can be reduced. A person skilled in the art can determine a reasonable number of slot layers in the stator slot 111 by comprehensively considering the actual requirements of the motor, as well as manufacturing costs and other factors.

[0071] As the number of slot layers in the stator slots 111 increases, the number of intermediate slot layers 114 also increases, requiring the placement of more first-type conductors. For example, if the number of slot layers in the stator slots 111 is 8, three first-type conductors are placed between any adjacent second-type and third-type conductors. In this disclosure, the conductors 124 placed in the intermediate slot layers 114 include only one type of first-type conductor with a span y-1. This simplifies the design structure and allows for greater electromagnetic capacity and torque of the motor.

[0072] In other embodiments not shown in this disclosure, the number of slot layers in the stator slot 111 can also be odd, for example, the number of slot layers in the stator slot 111 can be set to 5, 7, 9, etc. Based on the same design principle, those skilled in the art can make adaptive adjustments to the individual conductor portions 124 of the stator winding 120 according to a specific number of slot layers, thereby the final arrangement of the stator winding 120 satisfies a short-distance asymmetric arrangement as shown in Figure 2.

[0073] Referring to Figures 1 and 2, the conductor portion 124 has a rectangular cross-sectional shape in the direction perpendicular to the extending direction of the conductor portion 124 (the extending direction of the stator windings of each phase). It will be understood that designing the cross-section of the conductor portion 124 to be non-circular can increase the slot filling rate of the coils in the stator slot 111. By providing the conductor portion 124 with a rectangular cross-section, more conductor portions can be placed in the same volume of stator slot 111, thereby making the arrangement of multiple conductor portions 124 in the stator slot 111 more compact. It will be understood that the cross-section of the conductor portion 124 may also be of other shapes, such as a trapezoid.

[0074] Referring to Figure 1, the bent portion 121 of each conductor section 124 is located on one side of the stator core 110 in the axial direction D3, and the connecting end 122 of each conductor section 124 is located on the other side of the stator core 110 in the axial direction D3. In this way, by performing the connection work only on one side of the stator core 110 in the axial direction D3, the ends of multiple conductor sections 124 can be connected, improving the production and assembly efficiency of the stator assembly 100 and reducing production costs. That is, the winding of the stator windings for each phase can be achieved simply by welding the conductor sections 124 to be connected on the side where the connecting end 122 of the conductor section 124 is located. In industrial production, this saves production process time. In this disclosure, the bent portion 121 is located on the side where the hairpin end of the stator assembly 100 is located, and the connecting end 122 is located on the side where the weld end of the stator assembly 100 is located.

[0075] In this disclosure, the distance between two adjacent conductor portions 124 in the circumferential direction (first circumferential direction D1 / second circumferential direction D2) differs by y stator slots 111, and the connecting end 122 of the conductor portion 124 is designed to bend for easier connection.

[0076] Specifically, the second type of conductor portion is configured such that its connecting end 122, positioned along the first circumferential direction D1, is offset from the slot portion 123 to which it is connected, and the offset span is y / 2 stator slots 111.

[0077] The first type of conductor section is configured such that its two connecting ends 122 are offset from each other in opposite directions, with each connecting end 122 being offset by y / 2 stator slots 111 from the slot portion 123 to which it is connected.

[0078] The third type of conductor section is configured such that its connecting end 122, positioned along the second circumferential direction D2, is offset from the slot-in portion 123 to which it is connected, and the offset span is y / 2 stator slots 111.

[0079] In other words, the portion of each conductor portion 124 in the slot portion 123 that extends beyond the stator slot 111 is bent or curved in an upstream or downstream direction, thereby offsetting the connecting end 122 from the corresponding slot portion 123, which allows the connecting ends 122 of two conductor portions 124 of adjacent slot layers 112 that need to be connected to be close to each other in the winding direction of the winding 120, thus facilitating the connection of two conductor portions 124 of adjacent slot layers 112 that need to be connected without additional connecting structures.

[0080] Referring to Figure 1, the connecting end 122 of adjacent second-type conductor sections spans y / 2 stator slots 111 in the first circumferential direction D1. Assuming that the slot portion 123 of the second-type conductor section is located in slot g, the corresponding connecting end 122 of the first-type conductor section for connecting the second outermost slot layer 117 radially is actually located in slot (g+y / 2) and is within the radially outermost slot layer 113.

[0081] Correspondingly, the slot portion 123 of the first type of conductor in the second outermost slot layer 117 in the radial direction, connected to the second type of conductor, is located in the (g+y) slot, and the corresponding connecting end 122 is located in the (g+y / 2) slot, within the second outermost slot layer 117 in the radial direction. That is, the connecting ends 122 of both the second type of conductor and the first type of conductor are located in radially adjacent slot layers 112 of the stator core 110. Applying the same reasoning to other adjacent conductors 124, we can conclude that the connection positions of the conductors 124 are also located in the same radially adjacent slot layers 112.

[0082] In the manufacturing of the stator assembly 100, after all the conductors 124 are placed on the stator core 110, the conductors 124 of each phase of the stator winding can be connected by welding adjacent pairs of connecting ends 122 in the same radial direction.

[0083] In this embodiment, by offsetting the connection end 122 of each conductor section 124 by y / 2 stator slots 111, when all conductor sections 124 are placed on the stator core 110, the conductor sections 124 do not intersect or come into contact with each other, except for the lead wires, neutral dot wires, and welded connection ends. The conductor sections 124 can be pre-bent and then assembled on the stator core 110. Alternatively, the unbent conductor sections 124 can be assembled on the stator core 110 first, and then the portions beyond the stator slots 111 are uniformly bent. For example, conductor sections 124 of the same type can be bent in batches using mechanical equipment.

[0084] Referring to Figures 1 to 5, in one embodiment of the present disclosure, the first and last slots of the stator windings of each phase differ by y stator slots 111 in the first circumferential direction D1. Thus, the distance between the starting point (i.e., lead wire) and ending point (i.e., neutral dot wire) of the coil corresponding to each phase stator winding is small. Accordingly, the motor has stronger electromagnetic capacity and greater torque, especially at low speeds and during starting.

[0085] Specifically, if each phase's stator winding contains one coil, the starting point (first slot) and ending point (final slot) of the coil differ by y stator slots. If each phase's stator winding contains multiple branches connected in parallel, the starting point (first slot) of the first branch and the ending point (final slot) of the last branch differ by y stator slots in the winding direction.

[0086] The structure of the stator assembly 100 in one embodiment of this disclosure will be described below with reference to the specific embodiment shown in Figures 1 to 5.

[0087] The stator winding 120 includes three-phase windings. Each phase of the stator winding comprises one coil for winding convenience. The three-phase windings are the A-phase winding, B-phase winding, and C-phase winding, respectively. Stage number 2q is 8. Each phase occupies three stator slots 111 per stage. The stator core 110 has 72 stator slots 111 arranged in the circumferential direction.

[0088] Each stator slot 111 has a total of six slot layers 112, from the radially innermost slot layer 115 to the radially outermost slot layer 113. The slot layers 112 are numbered a, b, c, d, e, and f radially from the inside out, with slot layer a located at the slot opening of the stator slot 111 and slot layer f located at the slot bottom of the stator slot 111.

[0089] The stator assembly 100 further comprises a lead wire assembly 130 located on the stator core 110, the lead wire assembly 130 being situated on the outer periphery of the stator core 110. Specifically, the lead wire assembly 130 comprises an A-phase terminal 131, a B-phase terminal 132, and a C-phase terminal 133 (see Figure 1). The A-phase terminal 131 is connected to the lead wire of the A-phase winding, the B-phase terminal 132 is connected to the lead wire of the B-phase winding, and the C-phase terminal 133 is connected to the lead wire of the C-phase winding.

[0090] In this embodiment, the position of phase B is mechanically shifted 30° to the right relative to phase A, and phase C is mechanically shifted 60° to the right relative to phase A. The distance between the conductors of the three-phase windings is small, which further optimizes the motor performance. This results in a more uniform voltage distribution within the same slot, a reduction in the voltage difference between the conductor portions 124 of adjacent slot layers 112, a reduction in the risk of motor dielectric breakdown, and improved motor reliability.

[0091] If the stator core 110 has 72 slots, each stator slot 111 occupies a mechanical angle of 5° in the circumferential direction. Therefore, the lead wires of the A-phase winding and the lead wires of the B-phase winding differ by z / 12 = 6 stator slots 111 in the first circumferential direction D1, and the lead wires of the A-phase winding and the lead wires of the C-phase winding differ by z / 6 = 12 stator slots 111 in the first circumferential direction D1.

[0092] Taking the A-phase winding as an example, the winding method for forming the A-phase winding includes the following steps.

[0093] S1: A step of connecting the lead wire of the A-phase winding to the connecting end 122 of the first sub-conductor section located in the first slot, wherein the first sub-conductor section spans 10 stator slots 111 along the first circumferential direction.

[0094] S2: A step of connecting to a first type of conductor located in an adjacent slot layer 112, starting from the other connecting end 122 of the first sub-conductor of the previous step, and along a first circumferential direction D1, spanning every nine stator slots 111 from the radially outermost slot layer 113 to the radially innermost slot layer 115, until the radially second innermost slot layer 116 is connected, wherein each first type of conductor spans eight stator slots 111 along the first circumferential direction D1.

[0095] A first type of conductor located in the second innermost slot layer 116 in the radial direction spans nine stator slots 111 along the first circumferential direction D1, and is then connected to a connecting end 122 of a third type of conductor located in the innermost slot layer 115 in the radial direction, the third type of conductor also spans nine stator slots 111 along the first circumferential direction D1.

[0096] S3: Starting from the other connecting end 122 of the third type of conductor in the previous step, winding along the second circumferential direction D2 opposite to the first circumferential direction D1, from the radially innermost slot layer 115 to the radially outermost slot layer 113, A step of connecting to a first type of conductor portion located in an adjacent slot layer 112 for every nine stator slots 111 that span along a second circumferential direction D2, until a second connecting end 122 of a first sub-conductor portion located in the radially outermost slot layer 113, wherein each first type of conductor portion is arranged along the second circumferential direction D2, and a second first sub-conductor portion is arranged to span ten stator slots 111 along the first circumferential direction D1.

[0097] S4: A step of switching the span direction (winding direction) of the conductor section 124 to the first circumferential direction D1, starting from the second other connecting end 122 of the second first sub-conductor section and connecting to the second of the third type of conductor section located in the radially innermost slot layer 115.

[0098] S5: A step of switching the extending direction of the conductor portion 124 to a second circumferential direction D2 and winding it around the radial outermost slot layer 113 from the second of the third type of conductor portion until it connects to the first connecting end 122 of the second sub-conductor portion located in the radial outermost slot layer 113, wherein the second sub-conductor portion is positioned to span seven stator slots 111 along the first circumferential direction D1.

[0099] S6: Repeat steps S2 to S5 until the connecting end 122 of the first type of conductor is located in the second outermost slot layer 117 in the radial direction of the final slot.

[0100] S7: A step of connecting the neutral dot line of the A-phase winding to the connection end 122 of the first type of conductor located in the second outermost slot layer 117 in the radial direction of the final slot, wherein the first slot is the final slot that spans nine stator slots 111 in the first circumferential direction D1.

[0101] Assuming the first slot is stator slot 111 with serial number 1, and the first circumferential direction D1 is clockwise, stator slot 111 with serial number 72 is adjacent to stator slot 111 with serial number 1 in a counterclockwise direction. In this case, the winding of the A-phase winding is as follows.

[0102] 1f (connection end of lead wire) → 11f (first auxiliary conductor section spanning 10 stator slots 111) → 20e → 28d → 37c → 45b → 54a → 63a → 54b → 46c → 37d → 29e → 20f → 30f (spanning 10 stator slots 111) → 39e → 47d → 56c → 64b → 1a → 10a → 1b → 65c → 56d → 48e → 39f → 46f (second auxiliary conductor section spanning 7 stator slots 111) → 55e → 63d → 72c → 8b → 17a → 26a → 17b→9c→72d→64e→55f→65f (spanning 10 stator slots 111)→2e→10d→19c→27b→36a→45a→36b→28c→19d→11e→2f→12f (spanning 10 stator slots 111)→21e→29d→38c→46b→55a→64a→55b→47c→38d→30e→21f→28f (spanning 7 stator slots 111)→37e→45d→54c→62b→71a→8a→71b→63c→ 54d→46e→37f→47f (spanning 10 stator slots 111)→56e→64d→1c→9b→18a→27a→18b→10c→1d→65e→56f→66f (spanning 10 stator slots 111)→3e→11d→20c→28b→37a→46a→37b→29c→20d→12e→3f→10f (spanning 7 stator slots 111)→19e→27d→36c→44b→53a→62a→53b→45c→36d→28e→1 9f→29f (spanning 10 stator slots 111)→38e→46d→55c→63b→72a→9a→72b→64c→55d→47e→38f→48f (spanning 10 stator slots 111)→57e→65d→2c→10b→19a→28a→19b→11c→2d→66e→57f→64f (spanning 7 stator slots 111)→1e→9d→18c→26b→35a→44a→35b→27c→18d→10e (connection end of neutral dotted line).

[0103] The spans from slot layer f to slot layer e, from slot layer d to slot layer c, and from slot layer b to slot layer a are all achieved by welding the connecting ends 122 of the two conductor sections 124.

[0104] The winding paths for the B-phase and C-phase windings can be determined in the same way. Finally, Figure 2 shows the distribution of the three-phase windings within the stator slot 111.

[0105] Steps S1 to S7 above can also be summarized as follows:

[0106] Step 1: A step of connecting a lead wire to a second type of conductor in a first slot, wherein the second type of conductor in the first slot is positioned to span along a first circumferential direction D1.

[0107] Step 2: Starting from the second type of conductor portion of the previous step, the third type of conductor portion of the radially innermost slot layer 115 is connected to the first type of conductor portion located in the adjacent slot layer 112 by spanning y stator slots 111, along the first circumferential direction D1, from the radially outermost slot layer 113 to the radially innermost slot layer 115, until the third type of conductor portion of the radially innermost slot layer 115 spans y stator slots 111 and is connected to the first type of conductor portion of the second radially innermost slot layer 116 along the first circumferential direction D1, wherein the third type of conductor portion is arranged to span along the first circumferential direction D1.

[0108] Step 3: Starting from the third type of conductor from the previous step, the step of connecting to the first type of conductor located in an adjacent slot layer 112 by spanning y stator slots 111 from the radially innermost slot layer 115 to the radially outermost slot layer 113, along the second circumferential direction D2 opposite to the first circumferential direction D1, until the second conductor of the second type of conductor located in the radially outermost slot layer 113 is connected in the first circumferential direction D1, wherein each first type of conductor is arranged to span along the second circumferential direction D2, and the second conductor of the second type of conductor is arranged to span along the first circumferential direction D1.

[0109] Step 4: Starting from the second type of the second type of conductor section, the step of switching the span direction of the conductor section 124 to the first circumferential direction D1.

[0110] Step 5: Repeat steps 2 through 4 until the first type of conductor is located in the second outermost slot layer 117 in the radial direction of the final slot.

[0111] Step 6: Connect the neutral dotted line to the first type of conductor portion of the second outermost slot layer 117 in the radial direction of the final slot.

[0112] Please understand that slot layer a is the radially innermost slot layer 115, slot layers b, c, d, and e are intermediate slot layers 114, and slot layer f is the radially outermost slot layer 113. Slot layer e is the radially second outermost slot layer 117 (belonging to one of the intermediate slot layers 114). Slot layer b is the radially second innermost slot layer 116 (belonging to one of the intermediate slot layers 114).

[0113] Referring to Figure 2, in the circumferential direction, the stator slot 111 comprises a first type of stator slot 118 and a second type of stator slot 119.

[0114] The slot layers 112 formed by the conductor portion 124 within the first type of stator slot 118 all belong to the same phase. In this embodiment, the conductor portions in the six slot layers 112 of the first type of stator slot 118 belong to the same phase of the stator winding (belonging to phase A, phase B, or phase C).

[0115] The conductor layers 112 formed by the conductor portions 124 within the second type of stator slot 119 each belong to two different phases, and the number of conductor layers 112 for different phases within the second type of stator slot 119 is not equal. In this embodiment, the conductor portions 124 of the six slot layers 112 of the second type of stator slot 119 belong to two different phases of the stator winding (each belonging to phase A and phase B, phase A and phase C, or phase B and phase C).

[0116] Referring to Figure 2, in the first circumferential direction D1, the two second type stator slots 119 are positioned between adjacent first type stator slots 118.

[0117] With respect to the first type of stator slot 118, the number of conductor layers 112 in the second type of stator slot 119, which is in phase with the first type of stator slot 118, decreases to 0 along the first circumferential direction D1 and the second circumferential direction D2, respectively.

[0118] The number of slots per stage per phase is q = 72 / 8 / 3 = 3, that is, the stator slots 111 per stage per phase include a first stator slot 118 and two second type stator slots 119.

[0119] For example, if all the conductor layers 112 of one first type stator slot 118 belong to phase A, then, with respect to the first type stator slot 118, the number of phase A conductor layers in the other stator slots 111 in the first circumferential direction D1 and the second circumferential direction D2 decreases continuously down to 0.

[0120] In this disclosure, adjacent first type stator slots 118 do not mean that two first type stator slots 118 are closely adjacent within the stator core, but rather that there are no other first type stator slots 118 between the two first type stator slots 118.

[0121] In this embodiment, the number of different two-phase conductor portions 124 is not equal in the six slot layers of the second type of stator slot 119 (2 and 4, respectively). In the second type of stator slot 119, the conductor portions 124 belonging to the same phase are continuously distributed in the radial direction.

[0122] Thus, an asymmetrical layout design of the stator winding 120 is formed, in which two of the second type stator slots 119 are continuous between two adjacent first type stator slots 118, and in five continuous stator slots 111, the central stator slot 111 has six in-phase conductor sections 124, and the two-phase conductors in the four left and right stator slots 111 are distributed asymmetrically.

[0123] In this embodiment, the winding distribution pattern for phase A in five consecutive stator slots 111 is 2, 4, 6, 4, 2. Referring to Figure 2 and Table 1 below, when the number of slots q per stage per phase is 3, the arrangement of the windings for one stage of the stator assembly 100 in each stator slot 111 along the first circumferential direction D1 is BBAAAA (from slot layer f to slot layer a), BBBBAA, BBBBBB, CCBBBB, CCCCBB, CCCCCC, AACCCC, AAAACC, and AAAAAA. It can be seen that the stator windings of each phase are distributed symmetrically with respect to the axis of the stator core 110, but asymmetrically in the radial direction.

[0124] [Table 1]

[0125] Generally, in the motor design and manufacturing process, designers attempt to avoid coil asymmetry (i.e., stator windings) and adopt symmetrical coil arrangements, such as a 3, 3, 6, 3, 3 distribution pattern, where the windings are distributed symmetrically in the radial direction, ensuring motor performance and reliability, and avoiding the generation of harmonic currents and axial forces in the motor caused by coil asymmetry, which affects motor efficiency and performance. The short-distance arrangement of asymmetric coils in this disclosure attempts from a different direction, employing technical means abandoned due to technical preconceptions, optimizing the design of the motor stator assembly, eliminating 5th and 7th harmonics, and reducing 6p-th order vibration noise, achieving better results.

[0126] Preferably, since the second type of stator slot 119 has two different phase conductor sections 124, the voltage gradient between the different phase conductor sections 124 is high, and insulating paper 140 can be placed in the second type of stator slot 119 to separate the conductor sections 124 belonging to different phases in order to ensure insulation strength and reliability (between the two different phase conductor sections 124).

[0127] Preferably, in this embodiment, the number of two-phase conductors 124 in the second type of stator slot 119 is 2 and 4, respectively, and the structure of the insulating paper 140 can be designed as type "B" (as shown in Figure 6). Specifically, the insulating paper 140 is configured as an integrally formed "B" structural member divided into two housing spaces 142 separated from each other by an intermediate partition portion 141, and the two housing spaces 142 are used to house conductors 124 of different phases, respectively. In this embodiment, the two housing spaces 142 are of different sizes. When assembling the stator assembly 100, the insulating paper 140 can be placed in the corresponding stator slots 111 in advance, and the conductors 124 can be assembled.

[0128] In other embodiments of the present disclosure, the stator winding 120 includes a three-phase winding, and each phase of the stator winding includes n branches connected in parallel, where n is an integer of 2 or more. That is, each phase of the stator winding may also consist of at least two branches.

[0129] For example, by arranging multiple branches of the stator windings for each phase in parallel, the magnetic field can be controlled by controlling the direction of current flow at each branch to form a more uniform rotating magnetic field. This improves the torque stability and operational stability of the motor, reduces the motor's mechanical losses, and extends the motor's lifespan.

[0130] Specifically, the lead wires of any two adjacent branch points in the stator windings of each phase differ by z / n stator slots 111 in the first circumferential direction D1. This allows for even distribution of the branching of each phase in the circumferential direction, improving motor stability. Furthermore, the first slot (lead wire) and the last slot (neutral dot wire) of each branch differ by z / ny stator slots 111 in the first circumferential direction D1, which facilitates the connection of the lead wires / neutral dot wires of each branch. Therefore, the number of branching points in the stator windings of each phase can be flexibly set according to actual needs, and the length of each branch can also be determined.

[0131] In another embodiment of the present disclosure, each phase of the stator winding includes four parallel branches (see Figures 10-12). Each lead wire of any two adjacent branches of the four branches differs by z / 4 stator slots 111 in the first circumferential direction D1. For example, if there are 72 stator slots 111, each lead wire of any two adjacent branches of the four branches differs by 18 stator slots 111 in the first circumferential direction D1. By distributing the four branches of each phase evenly in the circumferential direction in this way, motor performance can be further optimized, the risk of motor dielectric breakdown can be reduced, and the operational reliability of the motor can be improved.

[0132] If each phase of the stator winding contains two parallel branches, it can be understood that the lead wires of each of the two branches differ by 36 stator slots 111 in the first circumferential direction D1 (see Figures 7-9). Similarly, the number of branches in each phase of the stator winding can also be odd; for example, each phase of the stator winding may contain three parallel branches.

[0133] Next, with reference to Figures 2 and 10-12, the structure of a stator assembly 100 in another specific embodiment of the present disclosure will be described.

[0134] Referring to Figure 2, the stator assembly 100 is for an 8-stage 3-phase motor with 72 slots, where y = 72 / 8 = 9. Each stator slot 111 contains six slot layers 112, labeled a, b, c, d, e, and f in order from the slot opening to the slot bottom. Each phase of the stator winding contains four branches in parallel.

[0135] The lead wire of one branch of the A-phase winding and the lead wire of the corresponding branch of the B-phase winding differ by z / 12 = 6 stator slots 111 in the first circumferential direction D1, and the lead wire of one branch of the A-phase winding and the lead wire of the corresponding branch of the C-phase winding differ by z / 6 = 12 stator slots 111 in the first circumferential direction D1.

[0136] In this way, the neutral dot wires of each branch of each phase of the stator winding are spaced at smaller distances, and the leader wires of each branch of each phase of the stator winding are also spaced at smaller distances, which facilitates the interconnection of the neutral dot wires (or leader wires) and the connection of the neutral dot wires (or leader wires) to the leader wire assembly 130.

[0137] The four branch wires of each phase of the stator winding are connected to the common terminals of the corresponding phases: the A-phase common terminal, the B-phase common terminal, and the C-phase common terminal, respectively. Accordingly, the A-phase terminal 131 of the wire assembly 130 is connected to the A-phase common terminal, the B-phase terminal 132 is connected to the B-phase common terminal, and the C-phase terminal 133 is connected to the C-phase common terminal.

[0138] Taking the A-phase winding as an example, assuming that the first slot of the first branch is stator slot 111 with serial number 1, and that the first circumferential direction D1 is clockwise, then stator slot 111 with serial number 72 is adjacent to stator slot 111 with serial number 1 in a counterclockwise direction.

[0139] At this time, the windings of the four branching A-phase windings are as follows:

[0140] The connection configuration of the first branch of the A-phase winding is as follows:

[0141] 1f (connection end of the first branch lead line) → 11f (spanning 10 stator slots 111) → 20e → 28d → 37c → 45b → 54a → 63a → 54b → 46c → 37d → 29e → 20f → 30f (spanning 10 stator slots 111) → 39e → 47d → 56c → 64b → 1a → 10a → 1b → 65c → 56d → 48e → 39f → 46f (spanning 7 stator slots 111) → 55e → 63d → 72c → 8b → 17a → 26a → 17b → 9c → 72d → 64e (connection end of the first branch neutral dot line).

[0142] The connection configuration of the second branch of the A-phase winding is as follows:

[0143] 19f (connection end of the second branch lead line) → 29f (spanning 10 stator slots 111) → 38e → 46d → 55c → 63b → 72a → 9a → 72b → 64c → 55d → 47e → 38f → 48f (spanning 10 stator slots 111) → 57e → 65d → 2c → 10b → 19a → 28a → 19b → 11c → 2d → 66e → 57f → 64f (spanning 7 stator slots 111) → 1e → 9d → 18c → 26b → 35a → 44a → 35b → 27c → 18d → 10e (connection end of the second branch neutral dot line).

[0144] The connection configuration of the third branch of the A-phase winding is as follows:

[0145] 37f (connection end of the third branch lead line) → 47f (spanning 10 stator slots 111) → 56e → 64d → 1c → 9b → 18a → 27a → 18b → 10c → 1d → 65e → 56f → 66f (spanning 10 stator slots 111) → 3e → 11d → 20c → 28b → 37a → 46a → 37b → 29c → 20d → 12e → 3f → 10f (spanning 7 stator slots 111) → 19e → 27d → 36c → 44b → 53a → 62a → 53b → 45c → 36d → 28e (connection end of the third branch neutral dot line).

[0146] The connection configuration of the fourth branch of the A-phase winding is as follows:

[0147] 55f (connection end of the fourth branch lead line) → 65f (spanning 10 stator slots 111) → 2e → 10d → 19c → 27b → 36a → 45a → 36b → 28c → 19d → 11e → 2f → 12f (spanning 10 stator slots 111) → 21e → 29d → 38c → 46b → 55a → 64a → 55b → 47c → 38d → 30e → 21f → 28f (spanning 7 stator slots 111) → 37e → 45d → 54c → 62b → 71a → 8a → 71b → 63c → 54d → 46e (connection end of the fourth branch neutral dot line).

[0148] Correspondingly, the B-phase winding is the A-phase winding shifted to the right by the six stator slots 111.

[0149] The first branch lead wire of the B-phase winding is 7f, and the first branch neutral point wire of the B-phase winding is 70e.

[0150] The second branch lead wire of the B-phase winding is 25f, and the second branch neutral dot wire of the B-phase winding is 16e.

[0151] The third branch lead wire of the B-phase winding is 43f, and the third branch neutral point wire of the B-phase winding is 34e.

[0152] The fourth branch lead wire of the B-phase winding is 61f, and the fourth branch neutral dot wire of the B-phase winding is 52e.

[0153] The C-phase winding is the A-phase winding shifted to the right by 12 stator slots 111.

[0154] The first branch lead wire of the C-phase winding is 13f, and the first branch neutral point wire of the C-phase winding is 4e.

[0155] The second branch lead wire of the C-phase winding is 31f, and the second branch neutral point wire of the C-phase winding is 22e.

[0156] The third branch lead wire of the C-phase winding is 49f, and the third branch neutral point wire of the C-phase winding is 40e.

[0157] The fourth branch lead wire of the C-phase winding is 67f, and the fourth branch neutral dot wire of the C-phase winding is 58e.

[0158] Figure 2 shows the distribution of the 72-slot, 8-stage, 3-phase windings obtained by the above winding method in the stator core 110.

[0159] In the above embodiment, only an 8-stage 3-phase motor with 72 slots is used as an example. Those skilled in the art will understand that the winding method for each phase of the above embodiment can be applied to a 10-stage 3-phase motor with 90 slots and a 6-stage 3-phase motor with 54 slots. Depending on the winding arrangement of each phase (short-distance asymmetry) in the above embodiment, other arrangements based on the same or similar principles can be designed accordingly, for example, by changing the number of slots per stage per phase. Details are not described here.

[0160] A third aspect of the present disclosure provides a motor. The motor according to an embodiment of the present disclosure comprises a stator assembly 100 according to an embodiment of the present disclosure. The structure and operation of other components of the motor according to an embodiment of the present disclosure, such as the rotor, are well known to those skilled in the art and will not be described herein. The motor according to an embodiment of the present disclosure improves the overall performance of the motor by arranging the stator assembly 100 according to an embodiment of the present disclosure.

[0161] According to a fourth aspect of this disclosure, a vehicle is provided that includes a motor according to a third aspect of this disclosure. The motor according to the embodiment of this disclosure improves the overall performance of the vehicle.

[0162] Unless otherwise defined, technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which this disclosure belongs. The terms used in this description are for the sole purpose of describing specific embodiments and are not intended to limit this disclosure. Terms such as “disposed” as appearing herein may mean both that one component is directly attached to another component and that one component is attached to another component via an intermediate component. Features described herein in one embodiment may be applied to other embodiments alone or in combination with other features unless otherwise stated that the feature is not applicable to other embodiments.

[0163] While the embodiments described above illustrate the present disclosure, it should be understood that these embodiments are for illustrative and illustrative purposes only and do not limit the present disclosure to the embodiments described. Those skilled in the art will understand that many more types of modifications and alterations can be made in accordance with the teachings of the present disclosure, all of which fall within the scope of the claimed present disclosure.

Claims

1. A stator assembly (100) applicable to a z-slot 2p-stage m-phase motor, wherein the stator assembly (100) is A stator core (110) having z stator slots (111) arranged at intervals along the circumferential direction of the stator core (110), wherein each stator slot has a plurality of slot layers (112) arranged radially, A stator winding (120) comprising a plurality of conductor portions (124), wherein the plurality of conductor portions (124) A first type of conductor, comprising a first type of conductor, wherein each of the two slot portions (123) of the first type of conductor is located within an adjacent slot layer (112) and has a span of y-1 stator slots (111), Each of the two slot portions (123) of the first type of conductor is located in an intermediate slot layer (114) between the radially outermost slot layer (113) and the radially innermost slot layer (115), where y is an integer and y = z / 2p. A stator winding (120) is provided, Stator assembly (100).

2. The plurality of conductor parts (124) are, A second type of conductor, wherein the two slot portions (123) of the second type of conductor are located within the radially outermost slot layer (113), the first connecting end of the second type of conductor is connected to one of the second connecting ends of the first type of conductor, and the second connecting end of the second type of conductor is connected to the other first connecting end of the first type of conductor, The stator assembly (100) according to claim 1 is further provided.

3. The plurality of conductor parts (124) are, A third type of conductor, further comprising: the two slot portions (123) of the third type of conductor, which are located within the radially innermost slot layer (115) and have a span of y stator slots (111); The first connecting end of the third type of conductor is connected to one of the second connecting ends of the first type of conductor, and the second connecting end of the third type of conductor is connected to the other of the first connecting ends of the first type of conductor. The stator assembly (100) according to claim 2.

4. Each phase of the stator winding comprises a plurality of first type conductors, a second type conductor, and a third type conductor, The plurality of conductor portions (124) of the stator winding of each phase are located within the stator core (110), Two adjacent conductor portions (124) are located in different slot layers (112), and differ by y stator slots (111) in the circumferential direction. The conductor portion (124) is arranged starting from the radially outermost slot layer (113) of the first slot and toward the radially second innermost slot layer (116) of the last slot, and the kM+1th conductor portion (124) to the (k+1 / 2)M+1th conductor portion (124) are arranged to span along the first circumferential direction. The (k+1 / 2)M+2th conducting portion (124) to the (k+1)Mth conducting portion (124) are arranged to straddle a second circumferential direction opposite to the first circumferential direction. The (k+1 / 2)M+2th conductor portion (124) and the (k+1 / 2)M+1th conductor portion (124) differ by y stator slots (111) in the second circumferential direction, and the (k+1)M+1th conductor portion (124) and the (k+1)Mth conductor portion (124) differ by y stator slots (111) in the second circumferential direction, M is the number of slot layers (112) of the stator slot (111), k ≥ 0, and k is an integer. It is composed as follows: The stator assembly (100) according to claim 3.

5. The stator assembly (100) according to claim 4, wherein the second type of conductor portion comprises a first sub-conductor portion extending over y+1 stator slots (111) and a second sub-conductor portion extending over y-2 stator slots (111).

6. The stator assembly (100) according to claim 5, wherein the two first subconductor portions are arranged between two adjacent second subconductor portions.

7. A stator assembly (100) according to any one of claims 1 to 6, wherein the number of slots per stage per phase is q = z / (2p) / m = 3.

8. The number of stator slots (111) is 54, 72, or 90, and / or The number of slot layers in each stator slot (111) is 6, 8, or 10. A stator assembly (100) according to any one of claims 1 to 7.

9. The stator assembly (100) according to any one of claims 1 to 8, wherein the cross-sectional shape of the conductor portion (124) in a direction perpendicular to the extending direction of the conductor portion (124) is rectangular.

10. The stator assembly (100) according to any one of claims 1 to 9, wherein the stator winding (120) comprises a three-phase winding, each phase of the stator winding comprises one coil and a lead wire, and the neutral point wire of each phase of the stator winding differs by y stator slots (111) in the circumferential direction.

11. The stator assembly (100) according to claim 10, wherein the stator winding (120) comprises three phase windings, an A-phase winding, a B-phase winding, and a C-phase winding, and the lead wires of the A-phase winding and the lead wires of the B-phase winding differ by z / 12 stator slots (111) in the circumferential direction, and the lead wires of the A-phase winding and the lead wires of the C-phase winding differ by z / 6 stator slots (111) in the circumferential direction.

12. The stator winding (120) comprises a three-phase winding, and each phase of the stator winding has n branches connected in parallel, where n is an integer of 2 or more. Each of the lead wires of any two adjacent branches of the stator winding of each phase differs by z / n stator slots (111) in the circumferential direction. The leader line and the neutral dot line of each branch differ by z / n-y stator slots (111) in the circumferential direction. A stator assembly (100) according to any one of claims 1 to 9.

13. The stator assembly (100) according to claim 12, wherein each phase of the stator winding comprises four branches connected in parallel, and the respective lead wires of two adjacent branches of the four branches differ by z / 4 stator slots (111) in the circumferential direction.

14. The stator assembly (100) according to claim 12, wherein the stator winding (120) comprises three phase windings, an A-phase winding, a B-phase winding, and a C-phase winding, wherein the lead wire of one branch of the A-phase winding and the lead wire of the corresponding branch of the B-phase winding differ by z / 12 stator slots (111) in the circumferential direction, and the lead wire of the branch of the A-phase winding and the lead wire of the corresponding branch of the C-phase winding differ by z / 6 stator slots (111) in the circumferential direction.

15. The stator slot (111) comprises a first type of stator slot (118) and a second type of stator slot (119), The conductor portion (124) arranged in the first type of stator slot (118) belongs to the winding of the same phase, and the conductor portion (124) arranged in the second type of stator slot (119) belongs to the winding of two different phases. The number of conductor portions (124) belonging to the windings of the two different phases in the second type of stator slot (119) is not equal. A stator assembly (100) according to any one of claims 1 to 9.

16. A method for winding a winding for a stator assembly (100), The stator assembly (100) is applicable to a z-slot 2p-stage m-phase motor, and the stator assembly (100) is, A stator core (110) has z stator slots (111) arranged at intervals along the circumferential direction of the stator core (110), and each stator slot has multiple slot layers (112) arranged radially, A stator winding (120) comprising a plurality of conductor portions (124), wherein the plurality of conductor portions (124) A first type of conductor, comprising a first type of conductor, wherein each of the two slot portions (123) of the first type of conductor is located within an adjacent slot layer (112) and has a span of y-1 stator slots (111), Each of the two slot portions (123) of the first type of conductor is located in an intermediate slot layer (114) between the radially outermost slot layer (113) and the radially innermost slot layer (115), where y is an integer and y = z / 2p. It comprises a stator winding (120) and, The winding method of the stator winding for each phase includes the step of connecting the first type of conductor as part of the stator winding (120), A method for winding the windings of a stator assembly (100).

17. The plurality of conductor portions (124) of the stator winding (120) are The second type of conductor portion, wherein the two slot portions (123) of the second type of conductor portion are located within the radially outermost slot layer (113), the first connecting end of the second type of conductor portion is connected to one of the second connecting ends of the first type of conductor portion, and the second connecting end of the second type of conductor portion is connected to the other first connecting end of the first type of conductor portion, A third type of conductor, wherein the two slot portions (123) of the third type of conductor are located within the radially innermost slot layer (115) and have a span of y stator slots (111), and the first connecting end of the third type of conductor is connected to one second connecting end of the first type of conductor, and the second connecting end of the third type of conductor is connected to the other first connecting end of the first type of conductor, further comprising: The winding method for the stator windings of each phase is as follows: Step 1: Connecting a lead wire to the second type of conductor portion in the first slot, wherein the second type of conductor portion in the first slot is positioned to span along the first circumferential direction, Step 2: Starting from the second type of conductor portion of the preceding step, the step of connecting the first type of conductor portion of the second innermost slot layer (116) along the first circumferential direction, from the radially outermost slot layer (113) to the radially innermost slot layer (115), by spanning each of the y stator slots (111) until the first type of conductor portion of the radially innermost slot layer (116) spans y stator slots (111) along the first circumferential direction, and is connected to the third type of conductor portion of the radially innermost slot layer (115), wherein the third type of conductor portion is arranged to span along the first circumferential direction, Step 3: Starting from the third type of conductor portion of the previous step, the step of connecting to the first type of conductor portion located in an adjacent slot layer (112) by spanning y stator slots (111) along a second circumferential direction opposite to the first circumferential direction, from the radially innermost slot layer (115) to the radially outermost slot layer (113), until connecting to the second type of conductor portion located in the first circumferential direction of the radially outermost slot layer (113), wherein each first type of conductor portion is arranged to span along the second circumferential direction, and the second type of conductor portion is arranged to span along the first circumferential direction, and Step 4: Starting from the second of the second type of conductor section, the step of switching the orientation of the straddling arrangement of the conductor section (124) to the first circumferential direction, Step 5: Repeat steps S2 to S4 until the first type of conductor located in the second outermost slot layer (117) in the radial direction of the final slot, Step 6: Connect the neutral dotted line to the first type of conductor located in the second outermost slot layer (117) in the radial direction of the final slot, including, A method for winding a winding for a stator assembly (100) according to claim 16.

18. A motor comprising a rotor and stator assembly (100) according to any one of claims 1 to 15, and a method for winding the windings of the stator assembly (100) according to claim 16 or 17.

19. A vehicle comprising the electrical machinery described in claim 18.

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