Even-layer short-distance flat wire stator and wire winding thereof

Abstract

The invention relates to the technical field of motors, in particular to an even-layer short-distance flat wire stator and a wire winding thereof. Comprising a minimum unit coil formed by winding a single wire in a lap mode, each minimum unit coil comprises groove penetrating parts arranged on the two sides in parallel, the number of rectangular conductors in the groove penetrating parts on the two sides is the same even number not smaller than 4, and the rectangular conductors in the groove penetrating parts on the two sides are sequentially connected through connecting parts. And the tail ends of the groove penetrating parts at the two sides are respectively provided with a wire inlet end and a wire outlet end of the minimum unit coil. The motor also comprises a flat wire stator based on the minimum unit coil and a corresponding motor. By means of the structure, the winding structure has the advantage of short-distance winding, the problem that the flat wire motor is large in production and manufacturing technological process and complex is solved, and cost is reduced; the number of welding spots is reduced, and manufacturing reliability is improved; the insulation risk in the manufacturing process is solved. Copper wires are saved, the harmonic influence is weakened, and the NVH (noise vibration and harshness) of the motor, namely noise, vibration and irregularity generated in the running process of the motor, is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an even-layer short-spacing flat wire stator and a conductor winding thereof. Background Art

[0002] With technological advancements, flat wire motors are widely used in various fields due to their advantages such as high power density, high efficiency, and miniaturization. To address different applications, the winding methods used for the conductors in flat wire motors vary. Common methods include hairpin winding, ipin winding, Xpin winding, and flat wire continuous wave winding.

[0003] Hairpin windings are currently the mainstream solution. For example, patent publication number CN119834496A, "A Flat Wire Motor Stator, Flat Wire Motor, and Vehicle," discloses a flat wire motor stator, a flat wire motor, and a vehicle. The flat wire motor stator includes a wire winding and a stator core with stator slots. The wire winding includes a multi-phase winding, and each branch of the phase winding is composed of multiple hairpin coils connected in series. However, the production process of hairpin coils is complex, including wire forming, paint removal, wire insertion, twisting, welding, and coating. Consequently, the process is cumbersome, with numerous weld points and difficulty in ensuring welding quality.

[0004] In the prior art, the flat wire continuous wave winding has fewer welding points than the hairpin winding, and the manufacturing process is less than that of the hairpin winding, such as paint removal, twisting, welding, and coating. For example, in the prior art, the invention patent application "Stator of Flat Wire Motor and Flat Wire Motor" with patent publication number CN118137707A discloses a stator of a flat wire motor and a flat wire motor. The stator of the flat wire motor includes a stator core and a flat wire winding. The flat wire winding has a three-phase winding. The number of poles of the flat wire winding is 8, and the number of winding slots per pole and per phase of the stator core is 2. The number of layers L formed by the flat wire winding in the winding slot is an even number greater than 2. In each pole and per phase, the slots occupied by the flat wire winding include two inner slots that are continuous in the circumferential direction and two outer slots that are continuous in the circumferential direction. The inner slots are occupied by the corresponding windings in L / 2 layers located radially inward, and the outer slots are occupied by the corresponding windings in L / 2 layers located radially outward. The inner slots and the outer slots are staggered by 2 slots in the circumferential direction. However, since the invention application adopts continuous wave winding and complex wiring arrangement, all the wires of the motor need to be wound and arranged in advance. Multi-phase and multi-branch motors also involve transposition, etc. The winding and wiring equipment is complex and costly. The continuous wave winding solution is more difficult to design for short distances, and the end size advantage cannot be realized.

[0005] In summary, no existing solution combines the advantages of both hairpin and continuous wave windings. This approach offers the high power density and efficiency of a hairpin winding thanks to its compact arrangement, while also mimicking the continuous wave winding's reduced solder joints, optimized magnetic field distribution, and reduced resistance losses and torque ripple. The manufacturing process also eliminates the need for multiple soldering steps required for hairpin windings, nor does it require the large production platform required for continuous wave windings. Summary of the Invention

[0006] The object of the present invention is to provide an even-layer short-spacing flat wire stator and its conductor winding, forming a minimum winding unit by a stacking winding method and arranging the minimum winding units in an orderly manner.

[0007] In order to achieve the above-mentioned purpose, the present invention discloses the following technical solutions:

[0008] A wire winding includes a minimum unit coil formed by stacking a single wire. Each minimum unit coil includes two parallel slots, each containing the same number of rectangular conductors, an even number not less than 4. The rectangular conductors in the slots are sequentially connected by a connecting portion, and the ends of the slots are provided with the input and output terminals of the minimum unit coil. The minimum unit coil is an important component of the present invention. Connecting multiple rectangular conductors in parallel increases the cross-sectional area of the conductors. When transmitting the same current, it can reduce the AC resistance of the conductors, reduce copper loss, and improve the efficiency of the motor. At the same time, the distribution of multiple conductors also makes the current distribution more uniform, reducing the influence of skin effect and proximity effect. This structure essentially connects multiple rectangular conductors through connecting portions to form an integral frame structure. Compared with a hairpin coil composed of a single or a small number of conductors, it reduces the number of welding points. When subjected to electromagnetic forces during motor operation, it has better mechanical strength and stability, can better resist deformation and vibration, and improve the reliability and service life of the motor.

[0009] This regular structural shape and multi-conductor design may make it easier to use automated production equipment for winding and assembly during the manufacturing process, thereby improving production efficiency and consistency of product quality.

[0010] Preferably, the present invention also includes a double-unit coil, which is formed by connecting two of the minimum unit coils formed by winding a single wire at one time, wherein the two minimum unit coils are arranged side by side and the four groups of rectangular conductors are ensured to be in the same plane through the bending of the connecting part, and the ends of the outermost two side slots are respectively provided with the input end and the output end of the double-unit coil. The double-unit coil is formed by connecting two minimum unit coils at one time, which reduces the connection process in the manufacturing process. Compared with manufacturing two minimum unit coils separately and then connecting them, it can improve production efficiency and reduce production costs. And because the four groups of rectangular conductors are in the same plane, a more stable overall structure is formed. This structure can better withstand electromagnetic force and mechanical stress during the operation of the motor, reduce deformation or damage caused by vibration or other external forces, and improve the structural stability and reliability of the coil.

[0011] The present invention also includes an even-layer short-pitch flat wire stator, comprising a stator core on which the wire winding is installed; m stator slots Z are provided on the stator core, the stator slots are arranged in a ring along the circumferential direction of the stator core, and 2n layers of rectangular conductors are provided in each stator slot along the radial direction of the stator core; the 2n layers of rectangular conductors come from two different groups of minimum unit coils, including n layers of all rectangular conductors in the slot portion on one side of the minimum unit coil A and n layers of all rectangular conductors in the slot portion on one side of the minimum unit coil B, wherein m and n are both positive integers, and n is the number of rectangular conductors in the slot portion of the small unit coil.

[0012] Furthermore, for ease of installation, the two minimum unit coils are replaced one by one by a single double unit coil.

[0013] Preferably, the connection method of the minimum unit coil at the non-outlet end includes: the rectangular conductor from the minimum unit coil B in a stator slot Zm is connected to the rectangular conductor from the minimum unit coil A in another stator slot Zm+q-1, wherein the An-th layer of rectangular conductors and the Bn-th layer of rectangular conductors in another stator slot are connected in a short-distance manner, wherein q is the number of slots per pole per phase, m is the m-th stator slot, and n is the number of rectangular conductors in the slot portion of the small unit coil.

[0014] Preferably, the connection mode of the minimum unit coil of the wire winding at the outlet end includes: the Ath in a stator slot Zm H layer of rectangular conductors and the other stator slot B H-1 The rectangular conductors of each layer are connected in a short span manner; they are connected to any position of a single coil except the input and output ends; where 1<H≤n, and H is an integer.

[0015] Preferably, the wire winding of the stator assembly is composed of several minimum unit coils, and the connection between the minimum unit coils in the same branch is as follows: A1 of the outermost minimum unit coil is connected to A1 of another minimum unit coil; Bn of the innermost minimum unit coil is connected to Bn of another minimum unit coil.

[0016] Preferably, the connecting wires between the minimum unit coils of the stator assembly are connected in series via enameled wires.

[0017] Preferably, the wire winding is a three-phase winding, and the three-phase winding structure is exactly the same. It is obtained by rotating 2q slots and 4q slots clockwise or counterclockwise with one phase as the reference and the space where the other two phases are located as the reference phase, where q is the number of slots per pole per phase, and the three-phase electrical angles differ by 120 degrees from each other. The innermost connection mode and the outermost connection mode between the minimum unit coils of the stator assembly can be exchanged, specifically: the innermost jumper wire is moved to the outermost layer, and the outermost jumper wire is moved to the inner layer, thereby realizing the swapping of the inner and outer jumper wires.

[0018] The present invention also includes a flat wire motor provided with the even-layer short-spacing flat wire stator and its conductor windings.

[0019] Due to the adoption of the technical solution, the present invention has the following technical effects:

[0020] 1. Reduce the complexities of the flat wire motor manufacturing process, reduce production costs, equipment costs, and labor costs; reduce the number of solder joints, improve manufacturing reliability; and resolve insulation risks in the manufacturing process.

[0021] 2. It solves the problems of continuous wave winding scheme, complex wiring, high processing equipment cost, difficult wire embedding and high manufacturing scrap rate.

[0022] 3. Save copper wire, reduce harmonic effects, and improve motor NVH, which refers to the noise, vibration, and harshness generated by the motor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the smallest unit coil structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the partial winding of the smallest unit coil in the stator slot.

[0026] Figure 3 It is a schematic diagram of the double unit coil structure.

[0027] Figure 4 This is a schematic diagram of the conductors in the slots of the armature winding in a flat wire motor.

[0028] Figure 5 This is the distribution diagram of conductors in short-distance slots.

[0029] Figure 6 This is the distribution diagram of conductors in short-distance slots.

[0030] Figure 7 This is the distribution diagram of conductors in short-distance slots.

[0031] Figure 8 This is a schematic diagram of the flat wire motor in Example 1.

[0032] Figure 9 This is a schematic diagram of a flat wire motor with a single-phase winding in Example 1.

[0033] Figure 10 This is a schematic diagram of the flat wire motor in Example 2.

[0034] Figure 11 This is a schematic diagram of a flat wire motor with a single-phase winding in Example 2.

[0035] Figure 12 Schematic diagram of the flat wire motor in Example 3.

[0036] Figure 13 This is a schematic diagram of a flat wire motor with a single-phase winding in Example 3. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] It should be noted here that the hairpin winding commonly used in the prior art involves a large number of solder joints, and the number of solder joints has many negative effects on the winding: in terms of electrical performance, the resistance at the solder joint is usually greater than that of the rectangular conductor itself. The more solder joints there are, the more obvious the increase in winding resistance is. According to Joule's law, more heat will be generated, resulting in reduced motor efficiency and affecting output power. In addition, the difference in contact resistance of each solder joint will cause uneven current distribution, causing local overheating, accelerated local aging of the winding, and even short circuit. In terms of mechanical reliability, the thermal stress generated by welding causes stress concentration in areas with many solder joints. The vibration and temperature changes during motor operation can easily cause cracks in the solder joints, which in turn deteriorate the electrical connection and increase the resistance, which can eventually lead to... The solder joints may break and the windings may open. At the same time, a large number of solder joints also weakens the stability of the winding structure, which is prone to deformation and loosening when the motor is frequently started and stopped or subjected to external impact. In terms of manufacturing and maintenance, a large number of solder joints increases the welding workload, places high demands on equipment and operators, requires precise control of welding parameters, and is difficult to control quality, affecting production efficiency and increasing costs. When a motor fails, it is difficult to detect and repair, and more time and energy are required to locate the faulty solder joints. The cost of re-welding is high and the downtime is long. In terms of heat dissipation performance, the thermal conductivity of the solder joints is poor, and a large number of them will form a thermal resistance area that hinders heat transfer, change the internal heat dissipation path of the winding, cause local overheating of the motor, accelerate the aging of the insulation material, and reduce the service life of the motor.

[0039] In contrast, continuous wave windings have virtually no welds, but this doesn't mean they're the best choice. Continuous wave windings still have numerous drawbacks: In terms of design and manufacturing, the windings are prone to overlap, making them difficult to fit into stator slots and difficult to manufacture and assemble. They require an open-slot stator core, which results in high cogging torque. They also place strict requirements on the number of slots and branches per pole and phase of the stator. When these two factors don't match, achieving continuous wave windings becomes difficult and can lead to imbalances between the branches of each phase. Furthermore, the automated winding forming process is complex, increasing equipment costs and production difficulties. In terms of electrical performance, asymmetric winding branches will cause differences in back electromotive force, resistance, and inductance, reducing motor performance. The winding circulating current will also increase the additional loss of the motor and cause local overheating of the motor. At the same time, the flat copper wire itself has a significant skin effect under high-frequency conditions, which will produce large eddy current losses, resulting in increased copper loss in the wire winding, affecting the motor efficiency and power density. If the stranding method is used to reduce losses, the traditional stranding connection will cause new circulating current loss problems due to different leakage magnetic fields between the strands.

[0040] Therefore, how to combine the advantages of the two to produce a winding that is easy to produce and install while ensuring better use effect is the technical problem to be solved by the present invention.

[0041] Combine Figures 1 to 7As shown, in order to facilitate understanding of the technical solutions described in the present invention, the applicant explains the common names: in the present invention, the number of stator slots Z is m, the number of slots per pole per phase is q; the number of pole pairs is p; the number of branches is Q; the number of wires in a single slot is b. A single stacked winding is connected by p minimum unit coils through welding points to form a branch. A and B are respectively one of the two branches in one phase. The U-phase input end is defined as slot No. 1, and the output end is slot No. (1+p). "×" and "·" represent the input and output directions respectively; the numbers represent the order of routing, and the output end A1→A2→...→A(p*2b) is the routing order in one branch. The other branch is B, which is the same as A and will not be described in detail.

[0042] The present invention also relates to lead wires: Lead wires are conductors extending from each phase of a flat wire motor's windings. They are used to connect external circuits, connecting the motor windings to a power source or other electrical equipment to achieve power transmission and control. In a three-phase flat wire motor, there are typically three lead wires, corresponding to the U, V, and W phases, also known as phase wires. These lead wires connect the motor windings to a three-phase power source, enabling the motor to operate normally.

[0043] The present invention also relates to the star point line. In a star-connected flat-wire motor, the star point line, also known as the neutral point line, refers to the line extending from the common point connecting the ends of the three-phase windings. In this connection, the head ends of the three windings are connected to the three-phase power supply as lead wires, while their ends are connected together to form the star point.

[0044] The present embodiment will be described in detail below with reference to the accompanying drawings.

[0045] Example 1

[0046] like Figure 8 and Figure 9 As shown, the two branches of the minimum unit coil are evenly wound in a full circle, and the lead wires are concentrated. A 72-slot, 12-pole, 8-layer, 2-branch flat wire motor is used as an example for explanation.

[0047] like Figure 8 As shown, the total number of slots m = 72; the number of branches Q = 2; b = 8, where q = 2, the number of slots per pole = total number of slots / number of poles = 6, there are 3 phases in total, the number of slots per pole per phase is 2; the number of pole pairs p = 6. A branch is formed by connecting 12 minimum unit coils; the input end of the U phase U1 branch is defined as slot 1,

[0048] U1 branch:

[0049] Z1(A1)→Z6(B1)→Z1(A2)→Z6(B2)→Z1(A3)→Z6(B3)→Z1(A4)→Z6(B4)→Z 12 (B4)→Z7(A4)→Z 12 (B3)→Z7(A3)→Z<h2 style=";text-align:left;direction:ltr"> 12 <h2 style=";text-align:left;direction:ltr"> (B2)→Z7(A2)→Z<h2 style=";text-align:left;direction:ltr"> 12 <h2 style=";text-align:left;direction:ltr"> (B1)→Z7(A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0050] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 14 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 14 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 14 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 14 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 20 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 20 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 20 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 20 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0051] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 30 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 30 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 30 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 25 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 30 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 36 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 36 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 36 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 36 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0052] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 38 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 38 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 38 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 38 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 49 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 44 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 49 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 44 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 49 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 44(A2) → Z 49 (B1) → Z 44 (A1) →

[0053] Z 49 (A1) → Z 54 (B1) → Z 49 (A2) → Z 54 (B2) → Z 49 (A3) → Z 54 (B3) → Z 49 (A4) → Z 54 (B4) → Z 60 (B4) → Z 55 ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​<h2 style=";text-align:left;direction:ltr"> 18 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 13 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 18 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 24 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 24 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 24 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 24 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 19 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0058] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 26 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 26 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 26 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 26 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 31 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 32 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 32 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 32 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 32 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0059] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0060] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 50 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 50 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 50 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 55(B3)→Z 50 (A4)→Z 55 (B4)→Z 61 (B4)→Z 56 (A4)→Z 61 (B3)→Z 56 (A3)→Z 61 (B2)→Z 56 (A2)→Z 61 (B1)→Z 56 (A1)

[0061] Z 61 (A1)→Z 66 (B1)→Z 61 (A2)→Z 66 (B2)→Z 61 (A3)→Z 66 (B3)→Z 61 (A4)→Z 66 (B4)→Z 72 (B4)→Z 67 (A4)→Z 72 (B3)→Z 67 (A3)→Z 72 (B2)→Z 67 (A2)→Z 72 (B1)→Z 67 (A1)

[0062] In the stator assembly proposed in the embodiments of the present invention, each phase winding branch has the same number of components, and each branch passes through the same number of phase slots and layers. This essentially ensures that the back EMF of each branch is of the same phase and magnitude, and the resistance and inductance at the beginning and end of each branch are the same, achieving a balanced arrangement of the three-phase windings. It should be noted that the winding pattern of the V-phase and W-phase windings is the same as that of the U-phase winding, and they are symmetrically and evenly distributed on the stator. This will not be further illustrated here.

[0063] As can be seen from the figure, because two branches are used, there are 6 lead wires and 6 star point wires. The ones that are close to each other are used as lead wires. Since the spacing is relatively small, smaller lead copper bars can be made during production, which reduces costs and is more convenient to use.

[0064] Example 2

[0065] like Figure 10 and Figure 11 As shown, the two branches of the minimum unit coil are evenly wound with half a circle, and the two branches are half each. The lead wires are concentrated, and the lead wires and the star point line are distributed 180° oppositely.

[0066] The following shows the winding steps for the flat wire: total slot number m = 72; number of branches Q = 2; b = 8, where q = 6; number of pole pairs p = 6. A branch is formed by connecting 12 minimum unit coils; defining the U-phase U1 branch and the U2 branch.

[0067] U1 branch:

[0068] Z2(A1)→Z7(B1)→Z2(A2)→Z7(B2)→Z2(A3)→Z7(B3)→Z2(A4)→Z7(B4)→Z 12 (B4)→Z7(A4)→Z 12 (B3)→Z7(A3)→Z 12 (B2)→Z7(A2)→Z 12 (B1)→Z7(A1)→

[0069] Z 13 (A1)→Z 18 (B1)→Z 13 (A2)→Z 18 (B2)→Z 13 (A3)→Z 18 (B3)→Z 13 (A4)→Z 18 (B4)→Z 13 (B4)→Z8(A4)→Z 13 (B3)→Z8(A3)→Z 13 (B2)→Z8(A2)→Z3(B1)→Z8(A1)→

[0070] Z 14 (A1)→Z 19 (B1)→Z 14 (A2)→Z 19 (B2)→Z 14 (A3)→Z 19 (B3)→Z 14 (A4)→Z 19 (B4)→Z 24 (B4)→Z 19 (A4)→Z 24 (B3)→Z 19 (A3)→Z 24 (B2)→Z 19 (A2)→Z 24 (B1)→Z 19 (A1) →

[0071] Z 25 (A1)→Z 30 (B1)→Z 25 (A2)→Z 30 (B2)→Z25 (A3) → Z 30 (B3) → Z 25 (A4) → Z 30 (B4) → Z 25 (B4) → Z 20 (A4) → Z 25 (B3) → Z 20 (A3) → Z 25 (B2) → Z 20 (A2) → Z 25 (B1) → Z 20 (A1) →

[0072] Z 26 (A1) → Z 31 (B1) → Z 26 (A2) → Z 31 (B2) → Z 26 (A3) → Z 31 (B3) → Z 26 (A4) → Z 31 (B4) → Z 36 (B4) → Z 31 (A4) → Z 36 (B3) → Z 31 (A3) → Z 36 (B2) → Z 31 (A2) → Z 36 (B1) → Z 31 (A1)

[0073] Z 37 (A1) → Z 42 (B1) → Z 37 (A2) → Z 42 (B2) → Z 37 (A3) → Z 42 (B3) → Z 37 (A4) → Z 42 (B4) → Z 37 (B4) → Z 32 (A4) → Z 37 (B3) → Z 32 (A3) → Z 37 (B2) → Z 32 (A2) → Z 37 (B1) → Z 32 (A1)

[0074] Branch U2:

[0075] <h2 style=";text-align:left;direction:ltr">Z1(A1)→Z6(B1)→Z1(A2)→Z6(B2)→Z1(A3)→Z6(B3)→Z1(A4)→Z6(B4)→Z1(B4)→Z<h2 style=";text-align:left;direction:ltr"> 68 <h2 style=";text-align:left;direction:ltr"> (A4)→Z1(B3)→Z<h2 style=";text-align:left;direction:ltr"> 68 <h2 style=";text-align:left;direction:ltr"> (A3)→Z1(B2)→Z<h2 style=";text-align:left;direction:ltr"> 68 <h2 style=";text-align:left;direction:ltr"> (A2)→Z1(B1)→Z<h2 style=";text-align:left;direction:ltr"> 68 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0076] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 62 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 62 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 62 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 62 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0077] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 56 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 56 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 56 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 56 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0078] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 50 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 50 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 50 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 50 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (B4)→Z60 (B4)→Z 55 (A4)→Z 60 (B3)→Z 55 (A3)→Z 60 (B2)→Z 55 (A2)→Z 60 (B1)→Z 55 (A1)→

[0079] Z 49 (A1)→Z 54 (B1)→Z 49 (A2)→Z 54 (B2)→Z 49 (A3)→Z 54 (B3)→Z 49 (A4)→Z 54 (B4)→Z 49 (B4)→Z 44 (A4)→Z 49 (B3)→Z 44 (A3)→Z 49 (B2)→Z 44 (A2)→Z 49 (B1)→Z 44 (A1)

[0080] Z 38 (A1)→Z 43 (B1)→Z 38 (A2)→Z 43 (B2)→Z 38 (A3)→Z 43 (B3)→Z 38 (A4)→Z 43 (B4)→Z 48 (B4)→Z 43 (A4)→Z 48 (B3)→Z 43 (A3)→Z 48 (B2)→Z 43 (A2)→Z 48 (B1)→Z 43 (A1)

[0081] In the stator assembly proposed in this embodiment, the number of components in each branch of each phase winding is the same, and the number of phase slots and layers passed by each branch are the same, which basically achieves the same phase and magnitude of the back electromotive force of each branch, the same resistance and inductance at the beginning and end of each branch, and realizes a balanced arrangement of the three-phase winding.

[0082] Example 3

[0083] like Figure 12 and13 It should be noted in the figure that the winding is carried out with a double coil unit group. The two branches of the unit group are evenly wound half a circle, with half of each branch. The lead wires are concentrated, and the lead wires and the star point line are distributed 180° oppositely.

[0084] In the flat wire winding process, the total number of slots (m) is 72; the number of branches (Q) is 2; the number of pole pairs (b) is 8, of which q is 6; and the number of pole pairs (p) is 6. A branch is formed by connecting 12 minimum unit coils. The U-phase U1 branch input is defined as slot 1.

[0085] U1 branch:

[0086] Z1(A1)→Z6(B1)→Z1(A2)→Z6(B2)→Z1(A3)→Z6(B3)→Z1(A4)→Z6(B4)→Z 72 (A1)→Z5(B1)→Z 72 (A2)→Z5(B2)→Z 72 (A3)→Z5(B3)→Z 72 (A4)→Z5(B4)→

[0087] Z 11 (B4)→Z6(A4)→Z 11 (B3)→Z6(A3)→Z 11 (B2)→Z6(A2)→Z 11 (B1)→Z6(A1)→Z 12 (B4)→Z7(A4)→Z 12 (B3)→Z7(A3)→Z 12 (B2)→Z7(A2)→Z 12 (B1)→Z7(A1)→

[0088] Z 13 (A1)→Z 18 (B1)→Z 13 (A2)→Z 18 (B2)→Z 13 (A3)→Z 18 (B3)→Z 13 (A4)→Z 18 (B4)→Z 12 (A1)→Z 17 (B1)→Z 12 (A2)→Z 17 (B2)→Z 12 (A3)→Z 17 (B3)→Z 12 (A4)→Z 17 (B4)→

[0089] Z 23(B4) → Z 18 (A4) → Z 23 (B3) → Z 18 (A3) → Z 23 (B2) → Z 18 (A2) → Z 23 (B1) → Z 18 (A1) → Z 24 (B4) → Z 19 (A4) → Z 24 (B3) → Z 19 (A3) → Z 24 (B2) → Z 19 (A2) → Z 24 (B1) → Z 19 (A1) →

[0090] Z 25 (A1) → Z 30 (B1) → Z 25 (A2) → Z 30 (B2) → Z 25 (A3) → Z 30 (B3) → Z 25 (A4) → Z 30 (B4) → Z 24 (A1) → Z 29 (B1) → Z 24 (A2) → Z 29 (B2) → Z 24 (A3) → Z 29 (B3) → Z 24 (A4) → Z 29 (B4) →

[0091] Z 35 (B4) → Z 30 (A4) → Z 35 (B3) → Z 30 (A3) → Z 35 (B2) → Z 30 (A2) → Z 35 (B1) → Z 30 (A1) → Z 36 [[ID=八十六]](B4) → Z 31 (A4) → Z 36 (B3) → Z 31 (A3) → Z 36 (B2) → Z 31 (A2) → Z 36 (B1) → Z 31 (A1);

[0092] Branch U2: <h2 style=";text-align:left;direction:ltr">

[0093] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 71 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 71 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 71 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 71 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 72 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 67 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0094] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 61 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 66 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 65 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 65 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 65 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 65 <h2 style=";text-align:left;direction:ltr"> (B4)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0095] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 59 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 59 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 59 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 59 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 60 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 55 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0096] <h2 style=";text-align:left;direction:ltr">Z<h2 style=";text-align:left;direction:ltr"> 49 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 49 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 49 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 49 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 54 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 53 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 53 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 53 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 53 <h2 style=";text-align:left;direction:ltr"> (B4)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0097] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 47 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 47 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 47 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 47 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0098] <h2 style=";text-align:left;direction:ltr"> A1)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B4)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 48 <h2 style=";text-align:left;direction:ltr"> (B1)<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0099] <h2 style=";text-align:left;direction:ltr"> →Z<h2 style=";text-align:left;direction:ltr"> 43 <h2 style=";text-align:left;direction:ltr"> (A1)→<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0100] <h2 style=";text-align:left;direction:ltr"> Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (B3)→Z<h2 style=";text-align:left;direction:ltr"> 37 <h2 style=";text-align:left;direction:ltr"> (A4)→Z<h2 style=";text-align:left;direction:ltr"> 42 <h2 style=";text-align:left;direction:ltr"> (<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr">

[0101] <h2 style=";text-align:left;direction:ltr"> B4)→Z<h2 style=";text-align:left;direction:ltr"> 36 <h2 style=";text-align:left;direction:ltr"> (A1)→Z<h2 style=";text-align:left;direction:ltr"> 41 <h2 style=";text-align:left;direction:ltr"> (B1)→Z<h2 style=";text-align:left;direction:ltr"> 36 <h2 style=";text-align:left;direction:ltr"> (A2)→Z<h2 style=";text-align:left;direction:ltr"> 41 <h2 style=";text-align:left;direction:ltr"> (B2)→Z<h2 style=";text-align:left;direction:ltr"> 36 <h2 style=";text-align:left;direction:ltr"> (A3)→Z<h2 style=";text-align:left;direction:ltr"> 41(B3)→Z 36 (A4)

[0102] →Z 41 (B4);

[0103] This embodiment primarily demonstrates an alternative solution using dual-coil units. In the stator assembly proposed in this embodiment, each branch of each phase winding has the same number of components, passes through the same number of phase slots and layers, and simplifies the installation process. This essentially ensures that each branch has the same back EMF phase and magnitude, and the resistance and inductance at the beginning and end of each branch are identical, achieving a balanced arrangement of the three-phase windings.

[0104] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of implementation of the present invention. Any person of ordinary skill in the art can make some improvements without departing from the scope of the invention of the present invention, that is, all equivalent improvements made in accordance with the present invention should be covered by the scope of the present invention. In the description of this specification, the description of the reference terms "one embodiment / method", "some embodiments / methods", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples without contradicting each other.

[0105] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0106] Those skilled in the art will appreciate that the above embodiments are merely intended to clearly illustrate the present disclosure and are not intended to limit the scope of the present disclosure. Other changes or modifications may be made based on the above disclosure, and such changes or modifications are still within the scope of the present disclosure.

Claims

1. A wire winding, characterized in that: It includes a minimum unit coil formed by stacking a single wire, each of the minimum unit coils includes slots arranged in parallel on two sides, the number of rectangular conductors in the slots on both sides is the same even number not less than 4, the rectangular conductors in the slots on both sides are connected in sequence by connecting parts, and the ends of the slots on both sides are respectively provided with the input end and the output end of the minimum unit coil.

2. A wire winding according to claim 1, characterized in that: It includes a double unit coil, which is formed by connecting two minimum unit coils formed by stacking a single wire at one time. The two minimum unit coils are arranged side by side and the four groups of rectangular conductors are ensured to be in the same plane through the bending cooperation of the connecting part. The ends of the outermost two sides of the slot part are respectively provided with the input end and the output end of the double unit coil.

3. An even-layer short-pitch flat wire stator, characterized in that: The invention comprises a stator core installed with the wire winding according to claim 1; m stator slots Z are provided on the stator core, the stator slots are arranged in a ring along the circumferential direction of the stator core, and 2n layers of rectangular conductors are provided in each stator slot along the radial direction of the stator core; the 2n layers of rectangular conductors come from two different groups of minimum unit coils, including n layers of all rectangular conductors in the slot portion on one side of the minimum unit coil A and n layers of all rectangular conductors in the slot portion on one side of the minimum unit coil B, wherein m and n are both positive integers, and n is the number of rectangular conductors in the slot portion of the small unit coil.

4. The even-layer short-pitch flat wire stator according to claim 3, characterized in that: The two minimum unit coils are replaced by a single double unit coil as claimed in claim 2 .

5. The even-layer short-pitch flat wire stator according to claim 3, characterized in that: The connection method of the minimum unit coil at the non-outlet end includes: connecting the rectangular conductor from the minimum unit coil B in a stator slot Zm and the rectangular conductor from the minimum unit coil A in another stator slot Zm+q-1, wherein the An-th layer of rectangular conductors and the Bn-th layer of rectangular conductors in another stator slot are connected in a short-distance manner, where q is the number of slots per pole and per phase, m is the m-th stator slot, and n is the number of rectangular conductors in the slot portion of the small unit coil.

6. The even-layer short-pitch flat wire stator according to claim 3, characterized in that: The connection method of the minimum unit coil of the wire winding at the output end includes: H layer of rectangular conductors and the other stator slot B H-1 The rectangular conductors of each layer are connected in a short span manner; they are connected to any position of a single coil except the input and output ends; where 1<H≤n, and H is an integer.

7. The even-layer short-pitch flat wire stator according to claim 3, characterized in that: The wire winding of the stator assembly is composed of several minimum unit coils. The connection between the minimum unit coils in the same branch is as follows: A1 of the outermost minimum unit coil is connected to A1 of another minimum unit coil; Bn of the innermost minimum unit coil is connected to Bn of another minimum unit coil.

8. An even-layer short-pitch flat wire stator according to any one of claims 3-7, characterized in that: The connecting wires between the minimum unit coils of the stator assembly are connected in series through enameled wires.

9. An even-layer short-pitch flat wire stator according to any one of claims 3-7, characterized in that: The wire winding is a three-phase winding with exactly the same structure. It is obtained by rotating 2q slots and 4q slots clockwise or counterclockwise with one phase as the reference and the space where the other two phases are located as the reference phase, where q is the number of slots per pole per phase, and the three-phase electrical angles differ by 120 degrees from each other. The innermost connection mode and the outermost connection mode between the smallest unit coils of the stator assembly can be exchanged, specifically: the innermost jumper wire is moved to the outermost layer, and the outermost jumper wire is moved to the inner layer, thereby realizing the swapping of the inner and outer jumper wires.

10. A flat wire motor, characterized in that: A stator with even layers of short-spacing flat wires and a conductor winding thereof as described in any one of claims 3 to 9 is provided.

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