Winding method of stator coil of split-conductor motor and stator coil of split-conductor motor

Abstract

This application discloses a method for winding a stator coil of a split-wire motor and the split-wire motor stator coil itself. The winding method includes winding first and second coils. The first coil has first and second effective sides and first and second ends respectively connecting the ends of the first and second effective sides. The second coil has third and fourth effective sides and third and fourth ends respectively connecting the ends of the third and fourth effective sides. The first and second coils are connected in series and combined to form a split-wire motor stator coil, such that the first and third effective sides are arranged in parallel along the radial direction of the split-wire motor stator coil, and the second and fourth effective sides are arranged in parallel. The first and third effective sides are separately embedded in the same stator slot, and the second and fourth effective sides are separately embedded in another stator slot. This application can eliminate mutual tension stress and interference between coils during the process of separately embedding the effective sides into the corresponding stator slots, significantly reducing the deformation of the effective sides within the stator slots.

Description

Technical Field

[0001] This invention relates to the field of motor and manufacturing technology, and in particular to a method for winding stator coils of a split-wire motor and a split-wire motor stator coil. Background Technology

[0002] With the rapid development of new energy vehicles, robots, drones, industrial automation and other fields, increasingly higher requirements are being placed on the power density, energy conversion efficiency, miniaturization and cost control of motors.

[0003] Flat wire motors are typically made by winding flat wires with a roughly rectangular cross-section. They are then shaped through processes such as stretching, insulation wrapping, and hot pressing. Compared to traditional round wire motors, they have advantages such as high slot fill factor, good heat dissipation, and short end dimensions. They can reduce motor size, copper consumption, and energy conversion efficiency while maintaining the same power output. Therefore, they are gradually replacing traditional round wire motors and have broad market prospects.

[0004] Currently, based on winding manufacturing processes, flat wire motors can be divided into insert-type flat wire motors and press-fit flat wire motors. In insert-type flat wire motors, the stator slots generally use semi-closed slot openings, and the windings mostly use distributed wave windings, with a few using double-row concentrated wave windings. Essentially, both are formed with a single turn at one end, arranged in a certain pattern and inserted into the stator slots. Then, the other end undergoes a series of subsequent processing steps, including secondary twisting, flattening, welding, and solder joint coating. Using semi-closed slot openings in the stator slots helps reduce cogging torque, but it results in a more complex and cumbersome production process, a larger number of solder joints, and higher requirements for connection reliability. Furthermore, during insertion and twisting, the inter-turn insulation of the flat wire is easily damaged by friction and compression. During welding, the inter-turn insulation of the flat wire is easily damaged by high temperatures, leading to a decrease in motor insulation performance and subsequently causing motor insulation failures, severely affecting the motor's service life and operational stability.

[0005] In press-fit flat wire motors, stator slots are generally open-end slots, and the windings are mostly formed using distributed braided wave windings, with a few using distributed lap windings. These are then pressed into the stator slots using specialized equipment, resulting in high equipment investment, low standardization, and inability to achieve flexible production. The use of open-end slots increases the variation in air gap permeability, significantly increases cogging torque, and exacerbates vibration and noise. It also causes increased output torque fluctuations and reduced efficiency, significantly reducing the overall technical performance of the motor.

[0006] In order to meet the two key requirements of fewer solder joints and lower cogging torque, the industry urgently needs to develop a new winding method for stator coils of split-wire motors and a new type of stator coil for split-wire motors. Summary of the Invention

[0007] In response to the technical problems mentioned above, such as the difficulty in simultaneously meeting the two key requirements of fewer solder joints and high reliability of connections with low cogging torque, as well as the large investment in production equipment and low degree of standardization, this paper addresses these issues.

[0008] This application proposes a method for winding stator coils of a split-wire motor, applicable to a split-wire motor stator. The split-wire motor stator includes a stator core, which is annular and has multiple stator slots with semi-open slots evenly spaced along its circumference. The winding method includes: A first coil is wound, the first coil having a first effective side, a second effective side, a first end connecting one end of the first effective side and one end of the second effective side, and a second end connecting the other end of the first effective side and the other end of the second effective side; A second coil is wound, the second coil having a third effective side, a fourth effective side, a third end connecting one end of the third effective side and one end of the fourth effective side, and a fourth end connecting the other end of the third effective side and the other end of the fourth effective side; The first coil and the second coil are connected in series and combined into a stator coil of a split-wire motor, such that the first effective side and the third effective side are arranged in parallel along the radial direction of the stator coil of the split-wire motor, and the second effective side and the fourth effective side are arranged in parallel. The first effective edge and the third effective edge are separately embedded in the same stator slot, and the second effective edge and the fourth effective edge are separately embedded in another stator slot.

[0009] Optionally, winding the first coil specifically includes: continuously winding it from the 1st layer to the Nth layer using a single wire, with each layer sequentially forming a first effective side, a first end, and a second effective side, and the 1st layer to the (N-1th)th layer respectively bridging to the first effective side of the next layer through their respective second ends, and drawing a first lead from the end of the first effective side of the 1st layer and a second lead from the end of the second effective side of the Nth layer; wherein, N≥2; The winding of the second coil specifically includes: using a single wire to continuously wind from the first layer to the Nth layer, with each layer sequentially forming a third effective side, a third end, and a fourth effective side, and the first layer to the (N-1)th layer respectively connecting to the third effective side of the next layer through their respective fourth ends, and drawing a third lead from the end of the third effective side of the first layer and a fourth lead from the end of the fourth effective side of the Nth layer.

[0010] Optionally, the second coil and the first coil are each wound from two different wires; Connecting the first coil and the second coil in series to form a stator coil for a split-wire motor specifically includes: placing the second coil around the outer periphery of the first coil, with the second coil adjacent to the first coil, and connecting the third lead to the second lead.

[0011] Optionally, the second coil and the first coil are wound from the same wire; Connecting the first coil and the second coil in series to form a stator coil for a split-wire motor specifically includes: winding the second coil around the outer periphery of the first coil, with the second coil adjacent to the first coil, and the third lead wire being the same wire as the second lead wire.

[0012] Optionally, along the radial direction of the stator core, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; The stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the semi-open slot opening. The first effective edge and the third effective edge are separately embedded in the same stator slot, and the second effective edge and the fourth effective edge are separately embedded in another stator slot. Specifically, this includes: embedding the N layers of the first effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, and moving it along the circumference of the stator core toward the first sidewall to the first column, so that it is adjacent to the first sidewall; embedding the N layers of the third effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, so that it is adjacent to the second sidewall. The fourth effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, and moved to the first column along the circumference of the stator core towards the first sidewall, so that it is adjacent to the first sidewall. The second effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, so that it is adjacent to the second sidewall.

[0013] Optionally, winding the first coil specifically includes: using a single wire, winding alternately in the following order: winding the first effective side of the i-th layer, then twisting it through the first end of the i-th layer to the second effective side of the N+1-i-th layer and winding the second effective side of the N+1-i-th layer, then twisting it through the second end of the N+1-i-th layer to the first effective side of the i+1-th layer; finally winding the first effective side of the N-th layer, then twisting it through the first end of the N-th layer to the second effective side of the 1-th layer and winding the second effective side of the 1-th layer, and drawing a first lead wire from the end of the first effective side of the 1-th layer and a second lead wire from the end of the second effective side of the 1-th layer; where i = 1, 2, ..., N-1, N ≥ 2; The winding of the second coil specifically includes: using a single wire, winding alternately in the following order: winding the third effective side of the i-th layer, then twisting it through the third end of the i-th layer to the fourth effective side of the N+1-i-th layer and winding the fourth effective side of the N+1-i-th layer, then twisting it through the fourth end of the N+1-i-th layer to the third effective side of the i+1-th layer; finally winding the third effective side of the N-th layer, then twisting it through the third end of the N-th layer to the fourth effective side of the 1-th layer and winding the fourth effective side of the 1-th layer, and drawing a third lead wire from the end of the third effective side of the 1-th layer and a fourth lead wire from the end of the fourth effective side of the 1-th layer.

[0014] Optionally, the second coil and the first coil are wound from the same wire; The first coil and the second coil are connected in series and combined to form a stator coil of a split-wire motor. Specifically, the first coil and the second coil are arranged in parallel along the radial direction of the stator coil of the split-wire motor, and the second coil is adjacent to the first coil. The second lead and the third lead are the same wire.

[0015] Optionally, along the radial direction of the stator core, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; The stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the semi-open slot opening. The first effective edge and the third effective edge are separately embedded in the same stator slot, and the second effective edge and the fourth effective edge are separately embedded in another stator slot. Specifically, this includes: embedding the N layers of the first effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, and moving it along the circumference of the stator core toward the first sidewall towards the first column, so that it is adjacent to the first sidewall; embedding the N layers of the third effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, so that it is adjacent to the second sidewall. The second effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, and moved to the first column along the circumference of the stator core towards the first sidewall, so that it is adjacent to the first sidewall. The fourth effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, so that it is adjacent to the second sidewall.

[0016] Optionally, along the axial direction of the stator coil of the split-wire motor, the first effective sides of the N layers are arranged in parallel, the second effective sides of the N layers are arranged in parallel, the third effective sides of the N layers are arranged in parallel, and the fourth effective sides of the N layers are arranged in parallel.

[0017] Optionally, after winding the first coil, the first effective side and the second effective side of the first coil, which are respectively cured or semi-cured by an integral molding and curing process, are also included. After the second coil is wound, the process also includes the third and fourth effective sides of the second coil, which are cured or semi-cured by an integral molding and curing process.

[0018] This application also proposes a stator coil for a split-wire motor, mounted on a stator of the split-wire motor. The stator includes a stator core, which is annular and has multiple stator slots with semi-open slots evenly spaced along its circumference. The stator coil includes: The first coil has a first effective side, a second effective side, a first end connecting one end of the first effective side and one end of the second effective side, a second end connecting the other end of the first effective side and the other end of the second effective side, and a first lead and a second lead respectively extending from the end of the first effective side and the end of the second effective side; The second coil has a third effective side, a fourth effective side, a third end connecting one end of the third effective side and one end of the fourth effective side, a fourth end connecting the other end of the third effective side and the other end of the fourth effective side, and a third lead and a fourth lead respectively extending from the end of the third effective side and the end of the fourth effective side, wherein the third lead is connected to the second lead. Along the circumference of the stator core, the first effective side and the third effective side are arranged side by side in the same stator slot, and the second effective side and the fourth effective side are arranged side by side in another stator slot.

[0019] Optionally, the second coil is disposed on the outer periphery of the first coil.

[0020] Optionally, the stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the semi-open slot opening. The first effective edge is adjacent to the first sidewall of the same stator slot, the third effective edge is adjacent to the second sidewall of the same stator slot and the first effective edge; the fourth effective edge is adjacent to the first sidewall of the other stator slot, the second effective edge is adjacent to the second sidewall of the other stator slot and the fourth effective edge.

[0021] Optionally, the first coil and the second coil are arranged in parallel according to the end twisting position, so that the pitch of the first coil and the pitch of the second coil are equal.

[0022] Optionally, the stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the semi-open slot opening. The first effective edge is adjacent to the first sidewall of the same stator slot, the third effective edge is adjacent to the second sidewall of the same stator slot and the first effective edge; the second effective edge is adjacent to the first sidewall of the other stator slot, and the fourth effective edge is adjacent to the second sidewall of the other stator slot and the second effective edge.

[0023] Optionally, the first coil is a multi-turn coil wound with wires in a predetermined shape, the first effective side includes multiple layers of first effective sides arranged in parallel along the radial direction of the stator core, the second effective side includes multiple layers of second effective sides arranged in parallel along the radial direction of the stator core, the first end includes multiple layers of first end, and the second end includes multiple layers of second end. The second coil is a multi-turn coil wound with wires in a predetermined shape. The third effective side includes multiple layers of third effective sides arranged in parallel along the radial direction of the stator core. The fourth effective side includes multiple layers of fourth effective sides arranged in parallel along the radial direction of the stator core. The third end includes multiple layers of third end. The fourth end includes multiple layers of fourth end.

[0024] Optionally, along the radial direction of the stator core, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; The first effective edge and the third effective edge are both located in the lower layer of the same stator slot, and the second effective edge and the fourth effective edge are both located in the upper layer of the other stator slot.

[0025] The beneficial effects of this application include at least the following: The winding method of this embodiment includes winding a first coil and a second coil. The first coil has a first effective side, a second effective side, a first end connecting one end of the first effective side and one end of the second effective side, and a second end connecting the other end of the first effective side and the other end of the second effective side. The second coil has a third effective side, a fourth effective side, a third end connecting one end of the third effective side and one end of the fourth effective side, and a fourth end connecting the other end of the third effective side and the other end of the fourth effective side. The first coil and the second coil are connected in series and combined to form a stator coil for a split-wire motor, such that the first effective side and the third effective side are arranged in parallel along the radial direction of the stator coil, and the second effective side and the fourth effective side are arranged in parallel. The first effective side and the third effective side are separately embedded in the same stator slot, and the second effective side and the fourth effective side are separately embedded in another stator slot. In this application, the stator slot adopts a semi-open slot opening, resulting in lower cogging torque and improved overall performance. The two coils wound in this application are relatively independent and connected in series, which can reduce solder joints and improve the reliability of the connection. The first and third effective sides of the two coils are arranged in parallel and embedded in the same stator slot, while the second and fourth effective sides are arranged in parallel and embedded in another stator slot. During the winding process, although the shape of the effective sides and ends is constantly changing, the mutual tension and interference between the two coils can be eliminated because the two coils are relatively independent. This greatly reduces the deformation of the effective sides in the stator slot, making winding easier. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating a method for winding the stator coil of a motor with split conductors, according to an embodiment of this application. Figure 2 This is a schematic diagram of the stator coil structure of a motor with split conductors; Figure 3 This is a partial structural schematic diagram of the stator of the motor with split conductors according to this application; Figure 4 This is a schematic diagram of the structure of the stator coil of the split-conductor motor according to the first embodiment of this application; Figure 5 This is a schematic diagram of the structure of the stator coil of the split-conductor motor according to the second embodiment of this application.

[0028] Unless otherwise indicated, corresponding numbers and symbols in different figures generally refer to corresponding parts. The accompanying drawings are provided to clearly illustrate relevant aspects of various embodiments and are not necessarily drawn to scale. Detailed Implementation

[0029] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0030] The term "exemplary" as used herein means "serving as an example, embodiment, or illustration." Any embodiment illustrated herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. The terms "first," "second," "third," etc. (if present) in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "coupled," "connected," and "linked" should be interpreted broadly. For example, they can refer to electrical connection or mutual communication; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Furthermore, to better illustrate the present invention, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that the present invention can be practiced without certain specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order to highlight the spirit of the invention.

[0033] The stator for a split-conductor motor provided in this application can simultaneously meet the two key requirements of fewer solder joints, high connection reliability, and low cogging torque. The stator for a split-conductor motor provided in this application includes a stator core and multi-phase windings. The stator core is annular and has multiple stator slots evenly spaced along its circumference. The stator slots have semi-open slot openings. Along the radial direction of the stator core, the stator slots are divided into lower and upper layers from the slot bottom to the slot opening.

[0034] In this embodiment, a stator coil of a split-wire motor can be formed by winding a single wire in multiple layers with alternating inner and outer coils. Specifically, as shown... Figure 2 As shown, the stator coil of a split-wire motor is wound from a single wire in the following sequence: first effective side, first end, second effective side of the first layer of the outer coil; second end of the first layer of the outer coil turning to the first layer of the inner coil; first effective side, first end, second effective side of the first layer of the inner coil; second end of the second layer of the inner coil turning to the second layer of the outer coil; first effective side, first end, second effective side of the second layer of the outer coil; ...; second effective side of the fourth layer of the outer coil. When the split-wire motor stator coil is embedded into the corresponding stator slot, it needs to be embedded into the corresponding stator slot layer by layer in sequence. During this process, the pitch of the two effective sides is constantly changing, and the shapes of the first and second ends are also constantly changing. The end deformation stress will generate significant mutual pulling stress and interference on the effective sides within the stator slot, increasing the deformation of the effective sides within the stator slot and making split-wire embedding difficult.

[0035] To eliminate mutual stress and interference between coils and reduce the deformation of the effective sides in the stator slots, the first embodiment of this application provides a novel winding method for stator coils of a split-wire motor. This method makes coil insertion easier and allows for rapid and efficient insertion of the effective sides of the coils sequentially along the radial direction of the stator core from the semi-open slot openings into the corresponding positions in the stator slots. Although the shapes of the effective sides and ends change continuously, it can eliminate mutual stress and interference between coils and significantly reduce the deformation of the effective sides in the stator slots. This winding method is applied to a stator of a split-wire motor. The split-wire motor stator includes a stator core 3, which is annular and has multiple stator slots with semi-open slot openings evenly spaced along its circumference. The winding method includes the following steps: S1: Wind a first coil, the first coil having a first effective side, a second effective side, a first end connecting one end of the first effective side and one end of the second effective side, and a second end connecting the other end of the first effective side and the other end of the second effective side; S2: Wind a second coil, the second coil having a third effective side, a fourth effective side, a third end connecting one end of the third effective side and one end of the fourth effective side, and a fourth end connecting the other end of the third effective side and the other end of the fourth effective side; S3: Connect the first coil and the second coil in series and combine them into a stator coil of a split-wire motor, such that the first effective side and the third effective side are arranged in parallel along the radial direction of the stator coil of the split-wire motor, and the second effective side and the fourth effective side are arranged in parallel. S4 embeds the first effective edge and the third effective edge separately into the same stator slot, and embeds the second effective edge and the fourth effective edge separately into another stator slot.

[0036] For details, please refer to Figure 1 , Figure 3 , Figure 4 As shown, in step S1, a first coil 21 is wound with a wire according to a predetermined shape. The first coil 21 has a first effective side 211, a second effective side 212, a first end 213 connecting one end of the first effective side 211 and one end of the second effective side 212, and a second end 214 connecting the other end of the first effective side 211 and the other end of the second effective side 212.

[0037] In step S2, a second coil 22 is wound with a wire according to a predetermined shape. The second coil 22 has a third effective side 221, a fourth effective side 222, a third end 223 connecting one end of the third effective side 221 and one end of the fourth effective side 222, and a fourth end 224 connecting the other end of the third effective side 221 and the other end of the fourth effective side 222.

[0038] The first coil 21 and the second coil 22 can be made by winding two wires separately, or the first coil 21 and the second coil 22 can be made by winding the same wire.

[0039] In step S3, the first coil 21 and the second coil 22 are connected in series and combined in a predetermined manner to form a stator coil of a split-wire motor, such that the first effective side 211 and the third effective side 221 are arranged in parallel along the radial direction of the stator coil of the split-wire motor, and the second effective side 212 and the fourth effective side 222 are arranged in parallel.

[0040] In step S4, the first effective edge 211 of the first coil 21 and the third effective edge 221 of the second coil 22 are separately embedded in the same stator slot 46 and arranged in parallel along the circumference of the stator core 3. The second effective edge 212 of the first coil 21 and the fourth effective edge 222 of the second coil 22 are separately embedded in another stator slot 1 and arranged in parallel along the circumference of the stator core 3.

[0041] As can be seen, the first and second coils are wound independently and combined according to a preset method to form a stator coil of a split-lead motor. The first and third effective sides are embedded separately in the same stator slot, and the second and fourth effective sides are embedded separately in another stator slot. Compared with the sequential layer-by-layer embedding method, although the shape of the effective sides and ends changes continuously, this winding method basically eliminates the mutual entanglement stress and interference between the two coils, minimizing the deformation of the effective sides in the stator slot and making embedding easier. In addition, the stator slots adopt a semi-open slot opening, which can reduce cogging torque, improve the overall performance of the split-lead motor, and the series connection of the two coils can reduce solder joints and improve the reliability of the connection.

[0042] Furthermore, the winding of the first coil specifically includes: continuously winding it from the 1st layer to the Nth layer using a single wire, with each layer sequentially forming a first effective side, a first end, and a second effective side, and the 1st layer to the (N-1th)th layer respectively connecting to the first effective side of the next layer through their respective second ends, and drawing a first lead from the end of the first effective side of the 1st layer and a second lead from the end of the second effective side of the Nth layer; wherein, N≥2; The winding of the second coil specifically includes: using a single wire to continuously wind from the first layer to the Nth layer, where N can be 4, but is not limited to this, forming a third effective side, a third end, and a fourth effective side in each layer in sequence, and the first layer to the (N-1)th layer respectively cross over to the third effective side of the next layer through their respective fourth ends, and drawing a third lead from the end of the third effective side of the first layer and a fourth lead from the end of the fourth effective side of the Nth layer.

[0043] Specifically, such as Figure 4As shown, a single wire is continuously wound from layer 1 to layer N. First, the first effective side, first end, and second effective side of layer 1 are wound. Then, the second end of layer 1 is crossed to the first effective side of layer 2, and the first effective side, first end, and second effective side of layer 2 are wound. Then, the second end of layer 2 is crossed to the first effective side of layer 3, and the first effective side, first end, and second effective side of layer 3 are wound. ..., until the second end of layer N-1 is crossed to the first effective side of layer N, and the first effective side, first end, and second effective side of layer N are wound. A first lead wire 2111 is drawn from the end of the first effective side of layer 1, and a second lead wire 2121 is drawn from the end of the second effective side of layer N.

[0044] A single wire is continuously wound from layer 1 to layer N. First, the third effective side, third end, and fourth effective side of layer 1 are wound. Then, the fourth end of layer 1 is crossed to the third effective side of layer 2, and the third effective side, third end, and fourth effective side of layer 2 are wound. Then, the fourth end of layer 2 is crossed to the third effective side of layer 3, and the third effective side, third end, and fourth effective side of layer 3 are wound. ..., until the fourth end of layer N-1 is crossed to the third effective side of layer N, and the third effective side, third end, and fourth effective side of layer N are wound. A third lead wire 2211 is drawn from the end of the third effective side of layer 1, and a fourth lead wire 2221 is drawn from the end of the fourth effective side of layer N.

[0045] Along the axial direction of the stator coil of the motor with split conductors, the first effective sides of the Nth layer are arranged in parallel and adjacent to each other, the second effective sides of the Nth layer are arranged in parallel and adjacent to each other, the third effective sides of the Nth layer are arranged in parallel and adjacent to each other, and the fourth effective sides of the Nth layer are arranged in parallel and adjacent to each other; the first ends of the Nth layer are arranged in parallel and adjacent to each other, the third ends of the Nth layer are arranged in parallel and adjacent to each other, the second ends of the N-1th layer are arranged in parallel and adjacent to each other, and the fourth ends of the N-1th layer are arranged in parallel and adjacent to each other.

[0046] Furthermore, the conductor is a flat wire, a round wire, or a combination of flat and round wires. Specifically, both the first coil and the second coil are multi-turn coils wound from flat wire in a predetermined shape, or multi-turn coils wound from round wire in a predetermined shape. In other embodiments, both the first coil and the second coil are multi-turn coils wound from a combination of flat and round wires in a predetermined shape; for example, the first effective side, the second effective side, the third effective side, and the fourth effective side are flat wires, and the first end, the second end, the third end, and the fourth end are round wires.

[0047] Furthermore, after winding the first coil, the process also includes curing or semi-curing the first effective edge and the second effective edge of the wound first coil through an integral molding and curing process. Specifically, the first coil is placed in a mold, filled with liquid resin (e.g., epoxy resin), and then cured, completely or partially encapsulating the first effective edge and the second effective edge of the wound first coil inside the resin. When the first coil is a multi-turn coil, the first coil is placed in a mold, filled with liquid resin (e.g., epoxy resin), and then cured, completely or partially encapsulating the N layers of the first effective edge and the N layers of the second effective edge inside the resin.

[0048] After winding the second coil, the process includes curing or semi-curing the third and fourth effective edges of the wound second coil using an integral molding and curing process. Specifically, the wound second coil is placed into a mold, filled with liquid resin (e.g., epoxy resin), and then cured, completely or partially encapsulating the third and fourth effective edges of the wound second coil within the resin. When the second coil is a multi-turn coil, it is placed into a mold, filled with liquid resin (e.g., epoxy resin), and then cured, completely or partially encapsulating the N layers of third and fourth effective edges of the second coil within the resin.

[0049] In addition to the methods described above, integral molding and curing processes also include heat shrinkable tape wrapping, mold forming, or self-adhesion and impregnation curing, which will not be described in detail here.

[0050] As can be seen, both the first and second coils are multi-turn coils with fewer solder joints, making it easier to ensure the quality of the motor stator with split wires. Furthermore, the number of turns can be adjusted over a wider range, making the motor design more flexible and facilitating the standardization and serialization of motor designs.

[0051] Furthermore, the second coil and the first coil are each wound with two different wires; the first coil and the second coil are connected in series and combined into a stator coil of a split-wire motor, specifically including: the second coil is sleeved on the outer periphery of the first coil, and the second coil is adjacent to the first coil, and the third lead is connected to the second lead.

[0052] Specifically, such as Figure 3 and Figure 4As shown, the second coil 22 is sleeved on the outer periphery of the first coil 21. The outer periphery of the first coil 21 refers to the side of the first coil 21 that is far away from the axis of the stator coil of the split-wire motor in the radial direction of the first coil 21. Along the radial direction of the first coil 21, the third effective edge 221 is located outside and adjacent to the first effective edge 211, the fourth effective edge 222 is located outside and adjacent to the second effective edge 212, the third end 223 is located outside and adjacent to the first end 213, and the fourth end 224 is located outside and adjacent to the second end 214. Specifically, along the radial direction of the first coil 21, the outer side of the first effective edge 211 refers to the side of the first effective edge 211 away from the axis of the first coil; the outer side of the second effective edge 212 refers to the side of the second effective edge 212 away from the axis of the first coil; the outer side of the first end 213 refers to the side of the first end 213 away from the axis of the first coil; and the outer side of the second end 214 refers to the side of the second end 214 away from the axis of the first coil. The first coil 21 and the second coil 22 are two independent coils connected by a second lead 2121 and a third lead 2211. The second lead 2121 and the third lead 2211 are connected by welding, or the second lead 2121 can also be connected to the third lead 2211 by welding through a continuous wire 23, wherein the continuous wire 23 can be a part of the second lead 2121 or the continuous wire 23 can be a part of the third lead 2211.

[0053] Furthermore, the second coil and the first coil are wound from the same conductor; connecting the first coil and the second coil in series and combining them into a stator coil of a split-conductor motor specifically includes: winding the second coil around the outer periphery of the first coil, with the second coil adjacent to the first coil, and the third lead wire and the second lead wire being the same conductor.

[0054] Specifically, such as Figure 3 and Figure 4As shown, a first coil 21 is first wound using the same wire, and a second coil 22 is then wound around the outer periphery of the first coil 21 using the same wire through a second lead 2121 and a third lead 2211. Along the radial direction of the first coil 21, the third effective side 221 is located outside and adjacent to the first effective side 211, the fourth effective side 222 is located outside and adjacent to the second effective side 212, the third end 223 is located outside and adjacent to the first end 213, and the fourth end 224 is located outside and adjacent to the second end 214. The second lead 2121 and the third lead 2211 are directly connected, and both can be the same conductor; alternatively, the second lead 2121 is connected to the third lead 2211 via a continuous conductor 23, wherein the continuous conductor 23 can be a part of the second lead 2121 or a part of the third lead 2211, and all three can be the same conductor. Therefore, using the same conductor results in fewer solder joints, higher connection reliability, and easier quality assurance.

[0055] Reference Figure 3 and Figure 4 Along the radial direction of the stator core 3, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; the stator slot includes a first sidewall 32 and a second sidewall 33 disposed opposite to each other, and a bottom wall 31 connecting the first sidewall 32 and the second sidewall 33. The first sidewall 32 is provided with a protrusion 321 extending toward the second sidewall 33, and the protrusion 321 and the second sidewall 33 define the semi-open slot opening.

[0056] The first effective edge 211 and the third effective edge 221 are separately embedded in the same stator slot 46, and the second effective edge 212 and the fourth effective edge 222 are separately embedded in another stator slot 1. Specifically, this includes: embedding the N layers of the first effective edge along the radial direction of the stator core 3 through the semi-open slot into the lower second column of the same stator slot 46, and moving it along the circumference of the stator core 3 toward the first sidewall 32 to the first column, so that it is adjacent to the first sidewall 32; embedding the N layers of the third effective edge along the radial direction of the stator core 3 through the semi-open slot into the lower second column of the same stator slot 46, so that it is adjacent to the second sidewall 33.

[0057] The fourth effective edge of the Nth layer is inserted into the second column of the upper layer of the other stator slot 1 through the semi-open slot along the radial direction of the stator core 3, and moved to the first column along the circumference of the stator core 3 towards the first sidewall 32, so that it is adjacent to the first sidewall 32. The second effective edge of the Nth layer is inserted into the second column of the upper layer of the other stator slot 1 through the semi-open slot along the radial direction of the stator core 3, so that it is adjacent to the second sidewall 33.

[0058] As can be seen, both the first and second coils are multi-turn coils, and the two coils are relatively independent. They are nested together to form a stator coil of a split-lead motor. The first and third effective sides are embedded and moved to corresponding positions in the same stator slot, and the second and fourth effective sides are embedded and moved to corresponding positions in another stator slot. Compared with the sequential layer-by-layer embedding method, this embedding method is easier. Although the shape of the effective sides and ends is constantly changing, it basically eliminates the mutual tension and interference between the two, minimizing the deformation of the effective sides in the stator slot. In addition, the stator slot adopts a semi-open slot, which can reduce cogging torque, improve the overall performance of the split-lead motor, and the series connection of the two coils can reduce solder joints and improve the reliability of the connection, making quality assurance easier. Moreover, the number of turns can be adjusted over a wider range, making the motor design more flexible and easy to achieve motor design standardization and serialization.

[0059] Further, the winding of the first coil specifically includes: using a single wire, winding alternately in the following order: winding the first effective side of the i-th layer, then twisting it through the first end of the i-th layer to the second effective side of the N+1-i-th layer and winding the second effective side of the N+1-i-th layer, then twisting it through the second end of the N+1-i-th layer to the first effective side of the i+1-th layer; finally winding the first effective side of the N-th layer, then twisting it through the first end of the N-th layer to the second effective side of the 1-th layer and winding the second effective side of the 1-th layer, and drawing out a first lead wire from the end of the first effective side of the 1-th layer and a second lead wire from the end of the second effective side of the 1-th layer; where i = 1, 2, ..., N-1, N ≥ 2; The winding of the second coil specifically includes: using a single wire, winding alternately in the following order: winding the third effective side of the i-th layer, then twisting it through the third end of the i-th layer to the fourth effective side of the N+1-i-th layer and winding the fourth effective side of the N+1-i-th layer, then twisting it through the fourth end of the N+1-i-th layer to the third effective side of the i+1-th layer; finally winding the third effective side of the N-th layer, then twisting it through the third end of the N-th layer to the fourth effective side of the 1-th layer and winding the fourth effective side of the 1-th layer, and drawing a third lead wire from the end of the third effective side of the 1-th layer and a fourth lead wire from the end of the fourth effective side of the 1-th layer.

[0060] Specifically, such as Figure 5 As shown, a single wire is used and wound alternately in the following order: the first effective edge of the first layer is wound, then the wire is twisted through the first end of the first layer to the second effective edge of the Nth layer and wound around the second effective edge of the Nth layer, then the wire is twisted through the second end of the Nth layer to the first effective edge of the second layer and wound around the first effective edge, then the wire is twisted through the first end of the second layer to the second effective edge of the (N-1)th layer and wound around the second effective edge of the (N-1)th layer, then the wire is twisted through the second end of the (N-1)th layer to the first effective edge of the third layer, ..., until the wire is twisted through the first end of the Nth layer to the second effective edge of the first layer and wound around the second effective edge of the first layer, and a first lead wire 4111 is drawn from the end of the first effective edge of the first layer and a second lead wire 4121 is drawn from the end of the second effective edge of the first layer.

[0061] Using a single wire, the wire is wound alternately in the following order: the third effective side of the first layer is wound, then the wire is twisted through the third end of the first layer to the fourth effective side of the Nth layer and wound around the fourth effective side of the Nth layer, then the wire is twisted through the fourth end of the Nth layer to the third effective side of the second layer and wound around the third effective side, then the wire is twisted through the third end of the second layer to the fourth effective side of the (N-1)th layer and wound around the fourth effective side of the (N-1)th layer, then the wire is twisted through the fourth end of the (N-1)th layer to the third effective side of the third layer, ..., until the wire is twisted through the third end of the Nth layer to the fourth effective side of the first layer and wound around the fourth effective side of the first layer, and a third lead wire 4211 is drawn from the end of the third effective side of the first layer and a fourth lead wire 4221 is drawn from the end of the fourth effective side of the first layer.

[0062] Along the axial direction of the stator coil of the motor with split conductors, the first effective sides of the Nth layer are arranged in parallel and adjacent to each other, the second effective sides of the Nth layer are arranged in parallel and adjacent to each other, the third effective sides of the Nth layer are arranged in parallel and adjacent to each other, and the fourth effective sides of the Nth layer are arranged in parallel and adjacent to each other.

[0063] Furthermore, the conductor is a flat wire, a round wire, or a combination of flat wire and round wire.

[0064] Furthermore, after winding the first coil, the process includes curing or semi-curing the first and second effective edges of the wound first coil using an integral molding and curing process; after winding the second coil, the process includes curing or semi-curing the third and fourth effective edges of the wound second coil using an integral molding and curing process. Specifically, the first and second coils are placed in molds, filled with liquid resin (e.g., epoxy resin), and then cured, completely or partially encapsulating the first and second effective edges of the wound first coil, as well as the third and fourth effective edges of the second coil, within the resin. In addition to the methods described above, integral molding and curing processes also include heat-shrinkable tape wrapping, mold forming, or self-adhesive and impregnation curing, which will not be specifically described here.

[0065] As can be seen, both the first and second coils are multi-turn coils with fewer solder joints, making it easier to ensure the quality of the motor stator with split wires. Furthermore, the number of turns can be adjusted over a wider range, making the motor design more flexible and facilitating the standardization and serialization of motor designs.

[0066] Furthermore, the second coil and the first coil are wound from the same conductor; the first coil and the second coil are connected in series and combined into a stator coil of a split-conductor motor, specifically including: along the radial direction of the stator coil of the split-conductor motor, the first coil and the second coil are arranged in parallel, and the second coil is adjacent to the first coil, and the second lead wire and the third lead wire are from the same conductor.

[0067] Specifically, such as Figure 3 and Figure 5As shown, along the radial direction of the stator coils of the split-wire motor, the first coil and the second coil are arranged in parallel. That is, along the radial direction of the stator coils of the split-wire motor, the third effective side 421 is located outside the first effective side 411 and adjacent to the first effective side 411, and the fourth effective side 422 is located inside the second effective side 412 and adjacent to the second effective side 412; the third end 423 is twisted from the outside of the first end 413 to the inside of the first end 413 and adjacent to the first end 413, and the fourth end 424 is twisted from the inside of the second end 414 to the outside of the second end 414 and adjacent to the second end 413. The portions 414 are adjacent to each other; wherein, along the radial direction of the first coil, the outer side of the first effective edge 411 refers to the side of the first effective edge 411 away from the axis of the first coil, the inner side of the second effective edge 412 refers to the side of the second effective edge 412 close to the axis of the first coil, the outer side of the first end 413 refers to the side of the first end 413 away from the axis of the first coil, the inner side of the first end 413 refers to the side of the first end 413 close to the axis of the first coil, the outer side of the second end 414 refers to the side of the second end 414 away from the axis of the first coil, and the inner side of the second end 414 refers to the side of the second end 414 close to the axis of the first coil.

[0068] In this embodiment, the first coil and the second coil are two independent coils, which are connected by a third lead 4211 and a second lead 4121. The third lead 4211 and the second lead 4121 are directly connected, and they can be the same wire, resulting in fewer solder joints, high connection reliability, and easy quality assurance.

[0069] Reference Figure 3 and Figure 5 ,Will Figure 3 The stator coil of the motor with split wires is replaced with Figure 5 The stator coil of the motor with split conductors shown has a lower and upper layer in the stator slot along the radial direction of the stator core 3, from the bottom to the opening of the slot. The stator slot includes a first sidewall 32 and a second sidewall 33 arranged opposite to each other, and a bottom wall 31 connecting the first sidewall 32 and the second sidewall 33. The first sidewall 32 has a protrusion 321 extending toward the second sidewall 33, and the protrusion 321 and the second sidewall 33 define the semi-open slot opening.

[0070] The first effective edge and the third effective edge are separately embedded in the same stator slot, and the second effective edge and the fourth effective edge are separately embedded in another stator slot. Specifically, this includes: embedding the N layers of the first effective edge along the radial direction of the stator core 3 through the semi-open slot into the second column of the lower layer in the same stator slot 46, and moving it along the circumference of the stator core 3 toward the first sidewall 32 into the first column, so that it is adjacent to the first sidewall 32; embedding the N layers of the third effective edge along the radial direction of the stator core 3 through the semi-open slot into the second column of the lower layer in the same stator slot 46, so that it is adjacent to the second sidewall 33.

[0071] The second effective edge of the Nth layer is inserted into the upper second column of the other stator slot 1 through the semi-open slot along the radial direction of the stator core 3, and moved to the first column along the circumference of the stator core 3 towards the first sidewall 32, so that it is adjacent to the first sidewall 32. The fourth effective edge of the Nth layer is inserted into the upper second column of the other stator slot 1 through the semi-open slot along the radial direction of the stator core 3, so that it is adjacent to the second sidewall 33.

[0072] As can be seen, both the first and second coils are multi-turn coils, and the two coils are relatively independent and arranged in parallel to form a stator coil of a split-wire motor. The first and third effective sides are separately embedded and moved to the corresponding positions in the same stator slot, and the second and fourth effective sides are separately embedded and moved to the corresponding positions in another stator slot. Compared with the sequential layer-by-layer embedding method, this embedding method is easier. Although the shape of the effective sides and ends is constantly changing, it basically eliminates the mutual entanglement stress and interference between the two, so that the deformation of the effective sides in the stator slot is minimized.

[0073] like Figure 3 , Figure 4 and Figure 5As shown in the figure, this application embodiment also provides a stator for a split-wire motor, which is installed on the stator. The stator includes a stator core 3, which is annular and has a plurality of stator slots with semi-open slots evenly spaced along the circumference of the stator core 3. The stator coil of the split-wire motor includes a first coil 21 and a second coil 22. The first coil 21 has a first effective side 211, a second effective side 212, a first end 213 connecting one end of the first effective side 211 and one end of the second effective side 212, a second end 214 connecting the other end of the first effective side 211 and the other end of the second effective side 212, and a first lead wire 2111 and a second lead wire 2121 respectively led out from the end of the first effective side 211 and the end of the second effective side 212. The second coil 22 has a third effective side 221, a fourth effective side 222, a third end 223 connecting one end of the third effective side 221 and one end of the fourth effective side 222, a fourth end 224 connecting the other end of the third effective side 221 and the other end of the fourth effective side 222, and a third lead 2211 and a fourth lead 2221 respectively extending from the end of the third effective side 221 and the end of the fourth effective side 222. The third lead 2211 is connected to the second lead 2121. Along the circumference of the stator core 3, the first effective side 211 and the third effective side 221 are arranged side by side in the same stator slot 46, and the second effective side 212 and the fourth effective side 222 are arranged side by side in another stator slot 1.

[0074] It is evident that when the first and third effective sides are separately embedded in the same stator slot, and the second and fourth effective sides are separately embedded in another stator slot, although the shapes of the effective sides and ends change continuously, the mutual entanglement stress and interference between the coils are essentially eliminated because the two coils are relatively independent. This minimizes the deformation of the effective sides within the stator slot and makes wire insertion easier. Furthermore, the use of semi-open stator slots reduces cogging torque, improves the overall performance of the motor with split conductors, and the series connection of the two coils reduces solder joints and improves connection reliability.

[0075] Reference Figure 3 and Figure 4 The second coil 22 is disposed on the outer periphery of the first coil 21, which refers to the side of the first coil 21 that is radially away from the axis of the stator coil of the split-wire motor. The second coil 22 and the first coil 21 are adjacent to each other.

[0076] Along the radial direction of the stator core 3, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; the stator slot includes a first sidewall 32 and a second sidewall 33 disposed opposite to each other, and a bottom wall 31 connecting the first sidewall 32 and the second sidewall 33. The first sidewall 32 is provided with a protrusion 321 extending toward the second sidewall 33, and the protrusion 321 and the second sidewall 33 define the semi-open slot opening.

[0077] The first effective edge is adjacent to the first sidewall 32 of the same stator slot 46, and the third effective edge is adjacent to the second sidewall 33 of the same stator slot 46 and the first effective edge. The first effective edge and the third effective edge are arranged side by side in the lower layer of the same stator slot 46. The fourth effective edge is adjacent to the first sidewall 32 of the other stator slot 1, and the second effective edge is adjacent to the second sidewall 33 of the other stator slot 1 and the fourth effective edge. The fourth effective edge and the second effective edge are arranged side by side in the upper layer of the other stator slot 1.

[0078] Reference Figure 3 and Figure 5 The first coil and the second coil are arranged in parallel with their ends twisted, such that the pitch of the first coil and the pitch of the second coil are equal. The second coil 22 and the first coil 21 are adjacent to each other.

[0079] Will Figure 3 The stator coil of the motor with split wires is replaced with Figure 5 The stator coil of the motor with split conductors shown has a lower and upper layer in the stator slot along the radial direction of the stator core 3, from the bottom to the opening of the slot. The stator slot includes a first sidewall 32 and a second sidewall 33 disposed opposite to each other, and a bottom wall 31 connecting the first sidewall 32 and the second sidewall 33. The first sidewall 32 has a protrusion 321 extending toward the second sidewall 33, and the protrusion 321 and the second sidewall 33 define the semi-open slot opening.

[0080] The first effective edge is adjacent to the first sidewall 32 of the same stator slot 46, and the third effective edge is adjacent to the second sidewall 33 of the same stator slot 46 and the first effective edge. The first and third effective edges are arranged side-by-side in the lower layer of the same stator slot 46. The second effective edge is adjacent to the first sidewall 32 of another stator slot 1, and the fourth effective edge is adjacent to the second sidewall 33 of the other stator slot 1 and the second effective edge. The second and fourth effective edges are arranged side-by-side in the upper layer of the other stator slot 1. The distance between the first and second effective edges is equal to the distance between the second and fourth effective edges.

[0081] Furthermore, the first coil is a multi-turn coil wound with wires in a predetermined shape, the first effective side includes multiple layers of first effective sides arranged in parallel along the radial direction of the stator core, the second effective side includes multiple layers of second effective sides arranged in parallel along the radial direction of the stator core, the first end includes multiple layers of first end, and the second end includes multiple layers of second end. The second coil is a multi-turn coil wound with wires in a predetermined shape. The third effective side includes multiple layers of third effective sides arranged in parallel along the radial direction of the stator core. The fourth effective side includes multiple layers of fourth effective sides arranged in parallel along the radial direction of the stator core. The third end includes multiple layers of third end. The fourth end includes multiple layers of fourth end.

[0082] The stator coil of the split-coil motor in this application is a multi-layered coil, which allows for a wider range of turns adjustment in motor design, greater flexibility in motor design, and easier standardization and serialization of motors of the same specifications, while also reducing costs. Furthermore, this multi-layered coil features fewer solder joints, higher reliability, and a semi-open slot design, reducing cogging torque and improving overall performance. Using two coils connected in series reduces solder joints and ensures high connection reliability. By separately embedding and shifting the parallel multi-layered first and third effective sides of the two coils into corresponding positions within the same stator slot, and the parallel multi-layered second and fourth effective sides into corresponding positions within another stator slot, the embedding process is easier. Although the shape of the effective sides and ends changes continuously, the relative independence of the two coils eliminates mutual stress and interference between them, significantly reducing the deformation of the effective sides within the stator slots.

[0083] Although embodiments of the present application and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the present application as defined by the appended claims.

[0084] Furthermore, the scope of this application is not limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, methods, and steps described herein. Those skilled in the art will readily understand from the disclosure of this application that, according to this application, currently existing or to be developed processes, machines, manufactures, compositions of matter, methods, or steps that perform substantially the same function or achieve substantially the same results as the corresponding embodiments described herein can be utilized. Therefore, it is intended that the appended claims encompass such processes, machines, manufactures, compositions of matter, methods, or steps within their scope.

Claims

1. A method for winding stator coils of a split-conductor motor, applied to the stator of a split-conductor motor, characterized in that, The stator of the split-conductor motor includes a stator core, the stator core being annular and having multiple stator slots with semi-open slots evenly spaced along its circumference; the winding method includes: A first coil is wound, the first coil having a first effective side, a second effective side, a first end connecting one end of the first effective side and one end of the second effective side, and a second end connecting the other end of the first effective side and the other end of the second effective side; A second coil is wound, the second coil having a third effective side, a fourth effective side, a third end connecting one end of the third effective side and one end of the fourth effective side, and a fourth end connecting the other end of the third effective side and the other end of the fourth effective side; The first coil and the second coil are connected in series and combined into a stator coil of a split-wire motor, such that the first effective side and the third effective side are arranged in parallel along the radial direction of the stator coil of the split-wire motor, and the second effective side and the fourth effective side are arranged in parallel. The first effective edge and the third effective edge are separately embedded in the same stator slot, and the second effective edge and the fourth effective edge are separately embedded in another stator slot.

2. The method for winding the stator coil of a split-conductor motor according to claim 1, characterized in that, The winding of the first coil specifically includes: continuously winding a single wire from the 1st layer to the Nth layer, with each layer sequentially forming a first effective side, a first end, and a second effective side, and the 1st layer to the (N-1th)th layer respectively connecting to the first effective side of the next layer through their respective second ends, and drawing a first lead from the end of the first effective side of the 1st layer and a second lead from the end of the second effective side of the Nth layer; wherein, N≥2; The winding of the second coil specifically includes: using a single wire to continuously wind from the first layer to the Nth layer, with each layer sequentially forming a third effective side, a third end, and a fourth effective side, and the first layer to the (N-1)th layer respectively connecting to the third effective side of the next layer through their respective fourth ends, and drawing a third lead from the end of the third effective side of the first layer and a fourth lead from the end of the fourth effective side of the Nth layer.

3. The method for winding the stator coil of a split-conductor motor according to claim 2, characterized in that, The second coil and the first coil are each made of two different wires. Connecting the first coil and the second coil in series to form a stator coil for a split-wire motor specifically includes: placing the second coil around the outer periphery of the first coil, with the second coil adjacent to the first coil, and connecting the third lead to the second lead.

4. The method for winding the stator coil of a split-conductor motor according to claim 2, characterized in that, The second coil and the first coil are wound from the same wire; Connecting the first coil and the second coil in series to form a stator coil for a split-wire motor specifically includes: winding the second coil around the outer periphery of the first coil, with the second coil adjacent to the first coil, and the third lead wire being the same wire as the second lead wire.

5. The method for winding the stator coil of a split-conductor motor according to claim 3 or 4, characterized in that, Along the radial direction of the stator core, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; The stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the semi-open slot opening. The first effective edge and the third effective edge are separately embedded in the same stator slot, and the second effective edge and the fourth effective edge are separately embedded in another stator slot. Specifically, this includes: embedding the N layers of the first effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, and moving it along the circumference of the stator core toward the first sidewall to the first column, so that it is adjacent to the first sidewall; embedding the N layers of the third effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, so that it is adjacent to the second sidewall. The fourth effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, and moved to the first column along the circumference of the stator core towards the first sidewall, so that it is adjacent to the first sidewall. The second effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, so that it is adjacent to the second sidewall.

6. The method for winding the stator coil of a split-conductor motor according to claim 1, characterized in that, The winding of the first coil specifically includes: using a single wire, winding alternately in the following order: winding the first effective side of the i-th layer, then twisting it through the first end of the i-th layer to the second effective side of the N+1-i-th layer and winding the second effective side of the N+1-i-th layer, then twisting it through the second end of the N+1-i-th layer to the first effective side of the i+1-th layer; finally winding the first effective side of the N-th layer, then twisting it through the first end of the N-th layer to the second effective side of the 1-th layer and winding the second effective side of the 1-th layer, and drawing out a first lead wire from the end of the first effective side of the 1-th layer and a second lead wire from the end of the second effective side of the 1-th layer; where i = 1, 2, ..., N-1, N ≥ 2; The winding of the second coil specifically includes: using a single wire, winding alternately in the following order: winding the third effective side of the i-th layer, then twisting it through the third end of the i-th layer to the fourth effective side of the N+1-i-th layer and winding the fourth effective side of the N+1-i-th layer, then twisting it through the fourth end of the N+1-i-th layer to the third effective side of the i+1-th layer; finally winding the third effective side of the N-th layer, then twisting it through the third end of the N-th layer to the fourth effective side of the 1-th layer and winding the fourth effective side of the 1-th layer, and drawing a third lead wire from the end of the third effective side of the 1-th layer and a fourth lead wire from the end of the fourth effective side of the 1-th layer.

7. The method for winding the stator coil of a split-conductor motor according to claim 6, characterized in that, The second coil and the first coil are wound from the same wire; The first coil and the second coil are connected in series and combined to form a stator coil of a split-wire motor. Specifically, the first coil and the second coil are arranged in parallel along the radial direction of the stator coil of the split-wire motor, and the second coil is adjacent to the first coil. The second lead and the third lead are the same wire.

8. The method for winding the stator coil of a split-conductor motor according to claim 7, characterized in that, Along the radial direction of the stator core, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; The stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the opening of the semi-open slot. The first effective edge and the third effective edge are separately embedded in the same stator slot, and the second effective edge and the fourth effective edge are separately embedded in another stator slot. Specifically, this includes: embedding the N layers of the first effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, and moving it along the circumference of the stator core toward the first sidewall towards the first column, so that it is adjacent to the first sidewall; embedding the N layers of the third effective edge along the radial direction of the stator core through the semi-open slot into the second column of the lower layer in the same stator slot, so that it is adjacent to the second sidewall. The second effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, and moved to the first column along the circumference of the stator core towards the first sidewall, so that it is adjacent to the first sidewall. The fourth effective edge of the Nth layer is inserted into the upper second column of the other stator slot through the semi-open slot along the radial direction of the stator core, so that it is adjacent to the second sidewall.

9. The method for winding the stator coil of a split-conductor motor according to claim 2 or 6, characterized in that, Along the axial direction of the stator coil of the motor with split conductors, the first effective sides of the N layers are arranged in parallel, the second effective sides of the N layers are arranged in parallel, the third effective sides of the N layers are arranged in parallel, and the fourth effective sides of the N layers are arranged in parallel.

10. The method for winding the stator coil of a split-conductor motor according to claim 1, characterized in that, After the first coil is wound, the first effective side and the second effective side of the first coil, which are cured or semi-cured by an integral molding and curing process, are also included. After the second coil is wound, the process also includes the third and fourth effective sides of the second coil, which are cured or semi-cured by an integral molding and curing process.

11. A stator coil for a split-conductor motor, mounted on the stator of a split-conductor motor, characterized in that, The stator of the split-conductor motor includes a stator core, which is annular and has a plurality of stator slots with semi-open slots at equal intervals along the circumference of the stator core. The stator coil of the split-conductor motor includes: The first coil has a first effective side, a second effective side, a first end connecting one end of the first effective side and one end of the second effective side, a second end connecting the other end of the first effective side and the other end of the second effective side, and a first lead and a second lead respectively extending from the end of the first effective side and the end of the second effective side; The second coil has a third effective side, a fourth effective side, a third end connecting one end of the third effective side and one end of the fourth effective side, a fourth end connecting the other end of the third effective side and the other end of the fourth effective side, and a third lead and a fourth lead respectively extending from the end of the third effective side and the end of the fourth effective side, wherein the third lead is connected to the second lead. Along the circumference of the stator core, the first effective side and the third effective side are arranged side by side in the same stator slot, and the second effective side and the fourth effective side are arranged side by side in another stator slot.

12. The stator coil of the split-conductor motor according to claim 11, characterized in that, The second coil is disposed on the outer periphery of the first coil.

13. The stator coil of the split-conductor motor according to claim 12, characterized in that, The stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the semi-open slot opening. The first effective edge is adjacent to the first sidewall of the same stator slot, the third effective edge is adjacent to the second sidewall of the same stator slot and the first effective edge; the fourth effective edge is adjacent to the first sidewall of the other stator slot, the second effective edge is adjacent to the second sidewall of the other stator slot and the fourth effective edge.

14. The stator coil of the split-conductor motor according to claim 11, characterized in that, The first coil and the second coil are arranged in parallel according to the end twisting position, so that the pitch of the first coil and the pitch of the second coil are equal.

15. The stator coil of the split-conductor motor according to claim 14, characterized in that, The stator slot includes a first sidewall and a second sidewall disposed opposite to each other, and a bottom wall connecting the first sidewall and the second sidewall. The first sidewall has a protrusion extending toward the second sidewall, and the protrusion and the second sidewall define the semi-open slot opening. The first effective edge is adjacent to the first sidewall of the same stator slot, the third effective edge is adjacent to the second sidewall of the same stator slot and the first effective edge; the second effective edge is adjacent to the first sidewall of the other stator slot, and the fourth effective edge is adjacent to the second sidewall of the other stator slot and the second effective edge.

16. The stator coil of the split-conductor motor according to claim 11, characterized in that, The first coil is a multi-turn coil wound with wires in a predetermined shape. The first effective side includes multiple layers of first effective sides arranged in parallel along the radial direction of the stator core. The second effective side includes multiple layers of second effective sides arranged in parallel along the radial direction of the stator core. The first end includes multiple layers of first end and the second end includes multiple layers of second end. The second coil is a multi-turn coil wound with wires in a predetermined shape. The third effective side includes multiple layers of third effective sides arranged in parallel along the radial direction of the stator core. The fourth effective side includes multiple layers of fourth effective sides arranged in parallel along the radial direction of the stator core. The third end includes multiple layers of third end. The fourth end includes multiple layers of fourth end.

17. The stator coil of the split-conductor motor according to claim 11, characterized in that, Along the radial direction of the stator core, the stator slot is divided into a lower layer and an upper layer from the bottom of the slot to the opening of the slot; The first effective edge and the third effective edge are both located in the lower layer of the same stator slot, and the second effective edge and the fourth effective edge are both located in the upper layer of the other stator slot.

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