Flat wire stator and motor
By adopting a center-symmetric multi-layer PIN line jumper structure in the flat wire stator, the problems of winding space utilization and mechanical stability are solved, and the compact winding arrangement is achieved, which improves the electromagnetic performance and miniaturization ability of the motor.
Patent Information
- Application Number
- CN202510371490.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2025-07-22
AI Technical Summary
The winding design of traditional flat wire stator has problems such as insufficient space utilization, uneven winding distribution and poor mechanical stability, which affects the electromagnetic performance and miniaturization process of the motor.
A multi-layer PIN line jumper structure with a central symmetrical structure is adopted, and an even-numbered layer is set in the stator slot, and the coil introduction and lead-out lines are located on the outermost side. The PIN line jumper structure meets the central symmetric relationship, avoids winding direction conflicts, and achieves compact overlap.
It improves the space utilization of the winding in the groove, reduces the dependence on the inner diameter of the stator core, improves mechanical stability and electromagnetic performance, and supports the efficient and miniaturized design of the motor.
Smart Images
Figure CN120357651A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of motors, and more particularly to a flat wire stator and a motor. Background Art
[0002] Currently, in the technical field of motors, as a key component of a motor, the performance of a flat wire stator directly affects the overall operation performance of the motor. Traditional stator designs face many technical problems and urgently need innovation and optimization.
[0003] In the early stage, insufficient consideration was given to the design of the number of slots in the stator core. The number of slots was small and irregularly arranged, unable to provide sufficient and uniform winding space for the windings. This led to an unbalanced distribution of the windings on the stator, making it difficult to achieve spatial and potential balance, greatly reducing the electromagnetic performance and operation stability of the motor. At the same time, the winding arrangement of traditional flat wire stators often has problems of insufficient space utilization, especially in the design of the number of winding layers and the layout of the bridging structure in the stator slots, which easily leads to loose winding arrangements. As a result, it is necessary to borrow the inner diameter space of the stator core to meet the winding arrangement requirements. This not only increases the design complexity of the stator core but also may affect the overall performance and miniaturization process of the motor. Summary of the Invention
[0004] The purpose of the present application is to provide a flat wire stator and a motor to solve the problem of unreasonable windings in the flat wire stator.
[0005] To achieve the above object, the technical solution adopted in the present application is as follows: A flat wire stator is provided, including: a stator core and a stator winding. The stator core is provided with a plurality of stator slots arranged at equal intervals in the circumferential direction and extending along the axial direction of the stator core; the stator winding includes a three-phase winding, and the three-phase winding includes a plurality of coils, and the plurality of coils are wound in the stator slots; wherein, a multi-layer PIN wire bridging structure is arranged in the stator slots, and the multi-layer PIN wire bridging structures satisfy a central symmetry relationship.
[0006] As a preference, each stator slot is provided with an even number of layers, and the lead-in wire and the lead-out wire of the coil are arranged on the outermost two layers, and the outside is the side away from the inner diameter space of the stator core, and the stator core is provided with an even number of stator slots extending along the axial direction.
[0007] As another preference, the innermost and outermost sides of the stator core located in the stator slots are both provided with the same-layer PIN wires, and the inner side is the side close to the inner diameter space of the stator core.
[0008] Further preferably, each phase in the three-phase winding includes a first branch and a second branch, and each branch is composed of a PIN wire spanning a full distance, a PIN wire spanning a long distance, and a PIN wire spanning a short distance; wherein the PIN wires are arranged in sequence from the outer side to the inner side along the radial direction of the stator core as follows: a PIN wire spanning 1-1 layers at a full distance, a PIN wire spanning 1-2 layers at a short distance, a PIN wire spanning 2-3 layers at a full distance, a PIN wire spanning 2-3 layers at a long distance, a PIN wire spanning 3-4 layers at a short distance, a PIN wire spanning 4-5 layers at a full distance, a PIN wire spanning 4-5 layers at a long distance, a PIN wire spanning 5-6 layers at a short distance, and a PIN wire spanning 6-6 layers at a full distance, and the PIN wire includes a first welding end, a first twist section, a first straight section, a U-shaped end, a second straight section, a second twist section, and a second welding end connected in sequence.
[0009] Further preferably, the radial envelope size of the PIN wires arranged at the same layer and with the same pitch at the innermost side of the stator slots is larger than the inner diameter of the stator core.
[0010] Preferably, the first twist section in the full-span PIN line spanning 1-1 layers cooperates with the second twist section to twist in the same direction; the first twist section in the full-span PIN line spanning 6-6 layers cooperates with the second twist section to twist in the same direction; wherein the twisting direction of the full-span PIN line spanning 1-1 layers is opposite to that of the full-span PIN line spanning 6-6 layers.
[0011] Preferably, the twisting direction of the first twist section and the second twist section in the short-span PIN line spanning 1-2 layers, the full-span PIN line spanning 2-3 layers, the long-span PIN line spanning 2-3 layers, the short-span PIN line spanning 3-4 layers, the full-span PIN line spanning 4-5 layers, the long-span PIN line spanning 4-5 layers, and the short-span PIN line spanning 5-6 layers is consistent, and the first twist section and the second twist section are respectively twisted toward both sides away from the center direction.
[0012] Preferably, the cross-layer PIN wires in each circle layer have only one twisting direction.
[0013] Preferably, the full-pitch PIN wires spanning 6-6 layers and the short-pitch PIN wires spanning 5-6 layers are mixedly arranged at the innermost PIN wire position of the same layer, and are both formed radially toward the outside to be larger than the inner diameter of the stator core.
[0014] Furthermore, the present application document also provides a motor, which includes: a motor rotor; a motor stator, wherein the motor stator is connected to the motor rotor, and the motor stator is specifically a flat wire stator as described in any one of the above items.
[0015] Compared with the prior art, the beneficial effects of this application are:
[0016] The flat wire stator provided in this application document shows significant advantages in terms of structural layout and electromagnetic performance through a centrally symmetric cross-layer PIN wire design. From the physical arrangement of the stator slots, the even layers combined with the centrally symmetric PIN wire cross-connection method result in a relatively high space utilization rate of the winding in the slots. Through the strict span correspondence relationship of each layer of PIN wires, such as the symmetric configuration of the cross 1-1 layer PIN wire and the cross 6-6 layer PIN wire, and the cross 1-2 layer PIN wire and the cross 5-6 layer PIN wire, the compact stacking of the winding is achieved, making the arrangement of the entire flat wire stator winding relatively compact without borrowing the space of the inner diameter of the stator core. This symmetric arrangement not only avoids the conflict of winding directions in traditional stators, but also makes the bending radius of the winding in the iron core slots uniform through the central symmetry of the turning directions of the inner and outer layer PIN wires, effectively reducing the stress concentration caused by deformation differences between conductor layers, thereby improving the overall mechanical stability of the stator.
[0017] At the same time, in this application document, by setting the stator slots to even layers and making the multi-layer PIN wire cross-connection structure satisfy the central symmetry relationship, this application achieves the compact stacking of the winding in the slots, significantly improving the space utilization rate, and at the same time avoiding the occupation of the space of the inner diameter of the stator core, providing strong support for the high-efficiency and miniaturized design of the motor. Brief Description of the Drawings
[0018] Figure 1 is a schematic structural diagram of the flat wire stator;
[0019] Figure 2 is a schematic structural diagram of the flat wire stator from another perspective;
[0020] Figure 3 is a schematic structural diagram of the stator core;
[0021] Figure 4 is a schematic structural diagram of the cross 1-1 layer PIN wire;
[0022] Figure 5 is a schematic structural diagram of the reverse turning wire type;
[0023] Figure 6 is a schematic structural diagram of the cross 6-6 layer PIN wire;
[0024] In the figure: 1. Flat wire stator; 10. Stator core; 11. Stator winding; 12. Stator slot; 13. Inner diameter space; 14. Three-phase winding; 15. Welding side; 16. U-shaped side; 20a. PIN wire across layer 1-1; 20b. Reverse torsion wire type; 20c. PIN wire across layer 6-6; 20d. Lead-in wire; 20e. Lead-out wire; 21. First welding end; 22. First torsion section; 23. First straight section; 24. U-shaped end; 241. First inclined section; 242. Cross-layer section; 243. Second inclined section; 25. Second straight section; 26. Second torsion section; 27. Second welding end. Detailed implementation mode
[0025] Next, in combination with the detailed implementation mode, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined with each other to form new embodiments.
[0026] In the description of the present application, it should be noted that for orientation terms, such as the terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.
[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.
[0028] The terms "including" and "having" in the description and claims of the present application, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.
[0029] In a preferred implementation mode, refer to Figures 1 to 6, this application document provides a flat wire stator 1, including: a stator core 10 and a stator winding 11. The stator core 10 is provided with a plurality of stator slots 12 that are arranged equidistantly in the circumferential direction and extend along the axial direction of the stator core 10. The stator winding 11 includes a three-phase winding 14, and the three-phase winding 14 includes a plurality of coils. The plurality of coils are wound in the stator slots 12. Each stator slot 12 is provided with an even number of layers, and the lead-in wire and the lead-out wire of the coil are arranged on the outermost two layers, and the outside is the side away from the inner diameter space 13 of the stator core 10. Among them, a multi-layer PIN wire bridging structure is arranged in the stator slot 12, and the multi-layer PIN wire bridging structures satisfy a central symmetry relationship.
[0030] As a preference, the stator core 10 is provided with an even number of stator slots 12 extending along the axial direction.
[0031] Specifically, the stator core 10 in this application document has 90 stator slots 12 that are arranged equidistantly along the axial direction and extend along the axial direction, and each stator slot 12 is provided with six layers. Therefore, it should be noted that a multi-layer PIN wire bridging structure is arranged in the stator slot 12. For example, the stator slot 12 in this application document is provided with six layers, and then the PIN wire distribution is preferably provided with a 1-1 layer PIN wire 20a, a 1-2 layer PIN wire, a 2-3 layer PIN wire, a 3-4 layer PIN wire, a 4-5 layer PIN wire, a 5-6 layer PIN wire, and a 6-6 layer PIN wire 20c. And because the multi-layer PIN wire bridging structures satisfy a central symmetry relationship, that is, the 1-1 layer PIN wire 20a and the 6-6 layer PIN wire 20c have the same structure and the same span. Similarly, the 1-2 layer PIN wire and the 5-6 layer PIN wire have the same structure and the corresponding span, and so on.
[0032] Therefore, for the flat wire stator 1 in this application document, in terms of the set structure, the 1-1 layer PIN wire 20a can be named to the innermost PIN wire, and the 6-6 layer PIN wire 20c is the outermost PIN wire. At this time, the stator core 10 is arranged in layers from the inside to the outside as 1, 2, 3, 4, 5, 6 layers. Similarly, because the 1-1 layer PIN wire 20a and the 6-6 layer PIN wire 20c have the same structure, the 1-1 layer PIN wire 20a can be named to the outermost PIN wire. At this time, the stator core 10 is arranged in layers from the outside to the inside as 1, 2, 3, 4, 5, 6 layers.
[0033] At the same time, the relationship between the cross-layer PIN wires is not mirror symmetry, that is, combined with Figures 4 to 6It should be noted that the twisting direction of the PIN wire 20a across the 1-1 layer is opposite to that of the PIN wire 20c across the 6-6 layer, presenting a central symmetry relationship. As a result, when observing the stator winding 11 in this application document from the outside to the inside, the observed winding structure is the same as that when observing from the inside to the outside. Specifically, in the stator slot 12 with 6 layers provided in this application document, from the outside to the inside, it is defined as layers 1, 2, 3, 4, 5, and 6. Correspondingly, the outermost layer is the PIN wire 20a across the 1-1 layer, and the innermost layer is the PIN wire 20c across the 6-6 layer. For the outermost PIN wire 20a across the 1-1 layer, when observing from the outside to the inside, the PIN wire 20a across the 1-1 layer twists to the left, and the PIN wire 20c across the 6-6 layer twists to the right. When observing from the inside to the outside, the PIN wire 20c across the 6-6 layer twists to the left, and the PIN wire 20a across the 1-1 layer twists to the right. Thus, the observation structures are consistent.
[0034] Furthermore, through the centrally symmetric cross-layer PIN wire design provided in this application document, the flat wire stator 1 demonstrates significant advantages in terms of structural layout and electromagnetic performance. From the perspective of the physical arrangement of the stator slot 12, the even layers are combined with the centrally symmetric PIN wire cross-connection method, resulting in a relatively high space utilization rate of the winding in the slot. Each layer of PIN wire achieves a compact stacking of the winding through a strict span correspondence relationship, such as the symmetric configuration of the PIN wire across the 1-1 layer and the PIN wire across the 6-6 layer, and the PIN wire across the 1-2 layer and the PIN wire across the 5-6 layer. The entire flat wire stator winding 11 is arranged in a relatively compact manner without borrowing the inner diameter space 13 of the stator core 10. This symmetric arrangement not only avoids the conflict of winding directions in traditional stators but also makes the bending radius of the winding in the core slot uniform through the central symmetry of the twisting directions of the inner and outer layer PIN wires, effectively reducing the stress concentration caused by deformation differences between conductor layers, thereby improving the overall mechanical stability of the stator.
[0035] From the perspective of the electromagnetic field distribution, since the equivalent spans of all cross-layer PIN wires maintain a symmetric relationship, a uniform current density distribution is formed in the slot depth direction of the winding, avoiding local overheating phenomena. Combining the characteristics that the outermost layer of PIN wires is uniformly arranged in the area far from the inner diameter of the iron core, not only the inner diameter space 13 is reserved for the optimized design of the heat dissipation channel, but also the axial height of the end winding is reduced through the external lead layout, providing a structural basis for the miniaturization of the motor.
[0036] In addition, this symmetric design endows the winding layout with higher process adaptability. When the naming direction of the PIN lines changes from "from outside to inside" to "from inside to outside", the symmetric characteristics of the cross-layer structure can still maintain the consistency of the winding form. This feature not only simplifies the fixture design in the production process, but also enables the same set of winding molds to adapt to the production requirements of different layer sequence definitions, significantly reducing the manufacturing cost. From the perspective of assembly reliability, the symmetrically distributed PIN lines form a self-balanced mechanical structure in the slots, which can effectively suppress the relative displacement of the conductor layers caused by centrifugal force during the high-speed operation of the motor, thereby improving the durability of the stator winding 11 under vibration conditions.
[0037] As another preference, both the innermost and outermost sides of the stator core 10 located within the stator slots 12 have the same-layer PIN line arrangements. The inner side is the side close to the inner diameter space 13 of the stator core 10. Specifically, in the specific example of this application document, the innermost PIN line is the cross-6-6 layer PIN line 20c, and the outermost PIN line is the cross-1-1 layer PIN line 20a, that is, the cross-1-1 layer PIN line 20a is arranged in the same layer, and the cross-6-6 layer PIN line 20c is arranged in the same layer.
[0038] Therefore, further, the flat wire stator 1 provided in this application document adopts 90 stator slots 12 distributed circumferentially, and each stator slot 12 is provided with a high-density layout of 6 layers of conductors. Combining with the center-symmetric PIN line cross-connection design, the rationality of the stator winding 11 under extreme structural conditions is achieved. For the stator core 10 with up to 90 slots, the mechanical interval between adjacent stator slots 12 is compressed to an extremely small value, and the stacking of 6 layers of conductors in each slot further exacerbates the complexity of space allocation. Under this working condition, the center-symmetric cross-layer structure ensures that the physical arrangement of each layer of conductors forms a self-similar pattern through a strict layer sequence mapping relationship, such as the span between the 1-1 layer and the 6-6 layer and the corresponding consistency of the structure settings. This regular layout enables the precise control of the interlayer gap of the high-density winding. When the number of conductor layers in each slot reaches 6 layers, the symmetric arrangement of the outermost two layers, such as the 1-1 layer and the 6-6 layer PIN lines, makes the welding ends of the PIN lines not need to extend towards the inner diameter direction of the core, thus reserving a complete annular heat dissipation channel in the center of the core in the dense arrangement scenario of 90 slots, effectively avoiding the local heat accumulation problem caused by the lead wires occupying the inner diameter space 13 in the traditional design.
[0039] In addition, the winding method of the stator winding 11 provided in this application document has particularly prominent process adaptability advantages under extreme structures. For the complex configuration of the stator core 10 with 90 slots and 6 layers, the central symmetry design effectively improves the reuse rate of the winding mold. That is, the same set of molds only needs to adjust the layer sequence mapping relationship to complete the synchronous forming of the inner and outer layer PIN wires. For example, when winding the 1-2 layer PIN wire structure, the mold simultaneously reserves the symmetric forming tracks of the 5-6 layer PIN wire structure. The same applies to the 2-3 layer corresponding to the 4-5 layer.
[0040] Further preferably, each phase of the three-phase winding 14 in this application document includes a first branch and a second branch. Therefore, in a specific example, each branch is composed of PIN wires spanning a full pitch, PIN wires spanning a long pitch, and PIN wires spanning a short pitch connected together; among them, the PIN wires are arranged radially from the outside to the inside of the stator core 10 as follows: the full-pitch PIN wire spanning layers 1-1, the short-pitch PIN wire spanning layers 1-2, the full-pitch PIN wire spanning layers 2-3, the long-pitch PIN wire spanning layers 2-3, the short-pitch PIN wire spanning layers 3-4, the full-pitch PIN wire spanning layers 4-5, the long-pitch PIN wire spanning layers 4-5, the short-pitch PIN wire spanning layers 5-6, and the full-pitch PIN wire spanning layers 6-6 20c. And the PIN wire includes a first welding end 21, a first turning section 22, a first straight section 23, a U-shaped end 24, a second straight section 25, a second turning section 26, and a second welding end 27 connected in sequence.
[0041] Among them, the U-shaped end 24 includes a first inclined section 241, a layer-crossing section 242, and a second inclined section 243. Taking a single PIN wire as an example, that is, the first straight section 23 and the second straight section 25 in the PIN wire are respectively inserted into the slot layers of the corresponding stator slots 12. The U-shaped end 24 is located on one end face side of the stator core 10, and this end face side is the U-shaped side 16. The first welding end 21, the first turning section 22, the second turning section 26, and the second welding end 27 are located on the other end face side of the stator core 10, and this end face is the welding side 15. In terms of production and manufacturing, the first turning section 22 and the second turning section 26 are turned after the PIN wire is inserted into the stator slot 12 of the stator core 10, and each PIN wire is welded and connected through the corresponding first welding end 21 or second welding end 27 after turning.
[0042] Specifically, for the PIN wire structure of the flat wire stator 1 in this application document, the full pitch is across five slot pitches, the short pitch is across four slot pitches, and the long pitch is across six slot pitches. Therefore, the three-phase winding 14 includes a plurality of coils, and the coils in each layer are formed by combining one or more of the full pitch PIN wires, short pitch PIN wires, and long pitch PIN wires. The plurality of coils are evenly distributed in the circumferential direction of the stator core 10. Furthermore, the coil includes a U-shaped end 24 and a welding end, which are respectively located on the U-shaped side 16 and the welding side 15 of the stator core 10. At the same time, the welding ends of the lead-in wire and the lead-out wire are located on the welding side 15 of the stator core 10.
[0043] Among them, the full pitch, short pitch, and long pitch span designs adopted in this application document, and the short pitch and the full pitch differ by one slot pitch, and the full pitch and the long pitch also differ by only one slot pitch. It is deeply coupled with the 90-slot 6-layer high-density stator core 10 structure provided in this application document, and has great advantages in terms of electromagnetic performance optimization and spatial layout coordination. Compared with the extensive configuration with a span interval of two or more slots in the traditional design, this application document realizes a double improvement in the winding distribution coefficient within a very narrow slot number window by finely adjusting the span step. For the stator core 10 with 90 stator slots 12, the mechanical angle corresponding to the adjacent slot pitch is only about 4°, and the electrical angle differences corresponding to each span type are strictly controlled within the range of about 4° to 24° (short pitch 4×4° = 16°, full pitch 5×4° = 20°, long pitch 6×4° = 24°). This fine span grading effectively improves the matching accuracy between the winding pitch and the magnetic field pole pitch.
[0044] Further preferably, the radial envelope size of the full pitch PIN wires arranged in the innermost layer of the stator slot 12 is larger than the inner diameter of the stator core 10, that is, the PIN wires on the side close to the inner diameter position of the stator core 10 do not occupy the inner diameter space 13 of the stator core 10. Furthermore, the overall layout of the flat wire stator winding 11 is relatively compact, and the inner diameter space of the stator core 10 does not need to be borrowed in the overall structure of the flat wire stator 1. When the flat wire stator 1 is applied to a motor, it is beneficial to the installation and adaptation of other subsequent components, ensuring the rationality of the internal structure of the motor.
[0045] Preferably, referring to Figures 4 to 6 , the first turning section 22 of the full pitch across 1-1 layer PIN wire 20a and the second turning section 26 are turned in the same direction; the first turning section 22 of the full pitch across 6-6 layer PIN wire 20c and the second turning section 26 are turned in the same direction; among them, the turning directions of the full pitch across 1-1 layer PIN wire 20a and the full pitch across 6-6 layer PIN wire 20c are opposite.
[0046] Preferably, the first twist section 22 and the second twist section 26 in the short-span 1-2 layer PIN line, the full-span 2-3 layer PIN line, the long-span 2-3 layer PIN line, the short-span 3-4 layer PIN line, the full-span 4-5 layer PIN line, the long-span 4-5 layer PIN line, and the short-span 5-6 layer PIN line have the same twisting direction, and the first twist section 22 and the second twist section 26 are respectively twisted toward both sides away from the center direction.
[0047] Preferably, the twist direction of the cross-layer PIN wire in each coil layer is one and only one, and the coil layers are arranged to form the structure of the stator winding 11. Specifically, the twist direction of the first twist section 22 and the second twist section 26 in the cross-layer PIN wire 20a is one and only one, Figure 4 For the reference explanation, that is, turning toward the left side, similarly, the first turning section 22 and the second turning section 26 of the 6-6 layer PIN line 20c have only one turning direction, that is, turning toward the right side. For the 1-2 layer PIN line, the 2-3 layer PIN line, the 3-4 layer PIN line, the 4-5 layer PIN line, and the 5-6 layer PIN line, no matter long distance, short distance or full distance, there is only one turning method, see for details. Figure 5 , showing the structure of the reverse twist line type 20b, that is, the first twist section 22 and the second twist section 26 are twisted toward both sides away from the center direction, Figure 5 The structure shown in the reverse twist line type 20b is applicable to any of the PIN lines spanning 1-2 layers, PIN lines spanning 2-3 layers, PIN lines spanning 3-4 layers, PIN lines spanning 4-5 layers, and PIN lines spanning 5-6 layers. The twist structures between the PIN lines are consistent, and only the spans are different.
[0048] Among them, when the twisting directions of the PIN wire 20a across the 1-1 layer and the PIN wire 20c across the 6-6 layer are opposite, the torsional stresses generated in the axial direction of the two outermost layers of conductors form a mutual offset effect. For example, the tangential force generated by the leftward twisting deformation of the 1-1 layer will be balanced by the equivalent reverse force of the rightward twisting of the 6-6 layer, avoiding the warping of the end winding caused by the unidirectional accumulated stress. The middle layer adopts a double-sided outward-expanding twist, that is, the first twist section 22 and the second twist section 26 are twisted away from the center to both sides, so that the end of the PIN wire forms a self-supporting structure in the circumferential direction, and the twist sections of adjacent PIN wires are staggered and interlocked in space, forming a mechanical network similar to "weaving".
[0049] When applying the PIN wire turning design in this application document to the stator core 10 with 90 stator slots 12, due to the large number of stator slots 12, the combination of each PIN wire is dense. The turning designs of the cross 1-1 layer PIN wire 20a and the cross 6-6 layer PIN wire 20c arranged in reverse symmetry form symmetrically distributed air channels at the welding end of the stator core 10, while the regular gaps generated by the turning of the double-sided outward expansion in the middle layer form an axial heat dissipation air duct to improve the heat dissipation path. In addition, the turning segments of the PIN wires in layers 2 to 5 drive the welding end to be uniformly oriented away from the center direction, avoiding the aggregation of high-temperature solder joints in the heat dissipation weak area and further improving the reliability of thermal management.
[0050] Preferably, the full-pitch cross 6-6 layer PIN wire 20c and the short-pitch cross 5-6 layer PIN wire are mixedly arranged at the same layer PIN wire position on the innermost side, and are both formed radially outward so that it is larger than the inner diameter of the stator core 10, making the arrangement of the entire flat wire stator winding 11 relatively compact without borrowing the space of the inner diameter of the iron core.
[0051] Furthermore, this application document also provides a motor, which includes: a motor rotor; a motor stator, the motor stator is connected to the motor rotor, and the motor stator is specifically the flat wire stator 1 as described in any one of the above.
[0052] The above describes the basic principle, main features and advantages of this application. Those skilled in the art of this industry should understand that this application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed. The scope of protection required by this application is defined by the appended claims and their equivalents.
Claims
1. A flat wire stator, characterized in that, Comprising: A stator core and a stator winding, wherein the stator core is provided with a plurality of stator slots arranged at equal circumferential intervals and extending axially along the stator core; The stator winding includes a three-phase winding, and the three-phase winding includes a plurality of coils, and the plurality of coils are wound in the stator slots; Wherein, a multi-layer PIN wire bridging structure is arranged in the stator slot, and the multi-layer PIN wire bridging structures satisfy a central symmetry relationship.
2. The flat wire stator according to claim 1, characterized in that Each of the stator slots has an even number of layers, and the lead-in wire and the lead-out wire in the coil are arranged on the outermost two layers, and the outside is the side away from the inner diameter space of the stator core, and the stator core is axially provided with an even number of stator slots.
3. The flat wire stator according to claim 1, characterized in that Both the innermost and outermost sides of the stator core located in the stator slot have the same layer of PIN wires arranged, and the inner side is the side close to the inner diameter space of the stator core.
4. The flat wire stator according to claim 3, characterized in that Each phase of the three-phase winding includes a first branch and a second branch, and each branch is connected and composed of a PIN wire spanning a full pitch, a PIN wire spanning a long pitch, and a PIN wire spanning a short pitch; Wherein, the PIN wires are arranged in sequence from the outside to the inside along the radial direction of the stator core as follows: a full pitch PIN wire spanning 1-1 layers, a short pitch PIN wire spanning 1-2 layers, a full pitch PIN wire spanning 2-3 layers, a long pitch PIN wire spanning 2-3 layers, a short pitch PIN wire spanning 3-4 layers, a full pitch PIN wire spanning 4-5 layers, a long pitch PIN wire spanning 4-5 layers, a short pitch PIN wire spanning 5-6 layers, and a full pitch PIN wire spanning 6-6 layers, and the PIN wire includes a first welding end, a first turning section, a first straight section, a U-shaped end, a second straight section, a second turning section, and a second welding end connected in sequence.
5. The flat wire stator according to claim 4, characterized in that The radial envelope dimension of the same layer of full pitch PIN wires arranged at the innermost side of the stator slot is larger than the inner diameter of the stator core.
6. The flat wire stator according to claim 4, characterized in that The first turning section in the full pitch PIN wire spanning 1-1 layers is turned in the same direction as the second turning section; The first turning section in the full pitch PIN wire spanning 6-6 layers is turned in the same direction as the second turning section; Wherein, the turning directions of the full pitch PIN wire spanning 1-1 layers and the full pitch PIN wire spanning 6-6 layers are opposite.
7. The flat wire stator according to claim 6, characterized in that The first turning section and the second turning section in the short pitch PIN wire spanning 1-2 layers, the full pitch PIN wire spanning 2-3 layers, the long pitch PIN wire spanning 2-3 layers, the short pitch PIN wire spanning 3-4 layers, the full pitch PIN wire spanning 4-5 layers, the long pitch PIN wire spanning 4-5 layers, and the short pitch PIN wire spanning 5-6 layers have the same turning direction, and the first turning section and the second turning section are both turned away from the center direction towards both sides.
8. The flat wire stator according to claim 7, characterized in that there is one and only one twisting direction of the cross-layer PIN wires in each layer.
9. The flat wire stator according to claim 4, characterized in that the full pitch cross 6-6 layer PIN wires and the short pitch cross 5-6 layer PIN wires are mixedly arranged at the same layer PIN wire position on the innermost side, and are all formed radially outwards so that they are larger than the inner diameter of the stator core.
10. A motor, characterized in that, The motor includes: a motor rotor; a motor stator, the motor stator is connected to the motor rotor, and the motor stator is specifically the flat wire stator according to any one of claims 1-9.