Coreless grating mesh-shaped brushless motor stator

Abstract

The utility model provides a coreless grid mesh brushless motor stator, comprising a cylindrical stator winding ring, the stator winding ring is formed by arranging and splicing a plurality of conductive rings along the circumferential direction at intervals, each conductive ring comprises a first conductive strip and a second conductive strip, the first conductive strip and the second conductive strip are mutually stacked in the radial direction of the stator winding ring, the first conductive strip and the second conductive strip are both of a non-straight-strip-shaped structure, the two ends of the first conductive strip are matched with the two ends of the second conductive strip respectively, and the first conductive strip and the second conductive strip are connected to form a semi-annular structure. According to the motor stator, an iron core and a tooth groove in a traditional stator are eliminated, so that the problems of non-uniform magnetic field distribution, large electromagnetic noise, high iron loss and the like are solved; the high-speed motor has the advantages of being smooth in starting, high in speed, stable in operation, low in noise, high in efficiency, large in power density, high in precision, small in size, light in weight, capable of saving more materials and the like, and a middle hole can be made to be larger so that thicker and more cables can penetrate through the middle hole conveniently.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a coreless brushless motor stator with a grid mesh. Background Technology

[0002] Currently, brushless motor stators on the market typically consist of a stator (silicon steel sheet) and enameled wire, forming a wound stator with an iron core. In this structure, the iron core is composed of various metal materials, while the enameled wire is embedded or directly wound into the stator manually or mechanically. The iron core and enameled wire are combined into a single component, which is then used in conjunction with the rotor. However, this traditional structure has several problems in practical applications: First, the motor starts slowly and is not smooth enough, and the speed regulation process is not smooth enough, mainly due to the uneven magnetic field distribution caused by the iron core structure; second, the motor generates significant electromagnetic noise during operation, affecting the user experience and working environment; in addition, there are many magnetic field harmonics, leading to unstable motor operation, reduced efficiency, and increased energy loss.

[0003] The presence of the iron core slotted structure also brings a series of problems. It not only causes significant rotational pulsation, affecting the smooth operation of the motor, but also limits the thickness of the enameled wire used, with most issues stemming from low or excessively high slot fill factor, thus hindering further improvements in motor efficiency. Simultaneously, the stator is prone to magnetic leakage, further reducing the overall performance of the motor.

[0004] Iron loss is another issue that cannot be ignored. Due to the presence of the core material, the motor generates significant iron loss during operation, directly affecting its efficiency. This not only increases energy consumption but may also lead to motor overheating and shorten its lifespan.

[0005] From a structural perspective, traditional iron-core brushless motors have a relatively large stator weight, which not only increases material costs but also limits the motor's use in weight-sensitive applications. The greater weight also implies a larger moment of inertia, which negatively impacts the motor's starting characteristics and dynamic response. Furthermore, the hidden energy consumption costs associated with producing ironless materials are significantly lower.

[0006] Finally, the traditional structure also has shortcomings in terms of accuracy. Due to the presence of the cogging structure, the overall accuracy of the motor is relatively low, especially in applications requiring precise control. Similarly, the cogging structure also results in lower braking accuracy, which may cause problems in some applications requiring precise positioning.

[0007] Currently, the winding equipment for coreless motors is also part of the technological barrier. Leading global manufacturers of winding machines are concentrated in Europe, America, and Japan, including companies such as Meteor (Switzerland), Tanaka Seiki (Japan), and Nippon Machinery (Japan). Overseas manufacturers possess advanced equipment, having largely achieved automation, intelligence, and networking in their winding equipment, resulting in reliable quality and high production efficiency. Domestic winding equipment in China has a low level of automation and lags behind overseas technology, including companies like Zhongte Technology, Qinlian Technology, and Taili Electronics. my country's research and development of coreless motor winding machines started late, with coil designs primarily based on winding, resulting in relatively complex processes. While some winding machines can achieve one-time winding, for the thicker wire diameter coils of larger power motors, domestic equipment still lags significantly behind world-class levels in terms of reliability and winding precision. The brushless motor applied in this invention avoids foreign technological barriers during production, enabling completely independent and unrestricted product manufacturing. Utility Model Content

[0008] The purpose of this application is to provide a coreless brushless motor stator with a grid mesh structure, which has the advantages of smooth and fast start-up, stable operation, low noise, high efficiency, high power density, high precision, larger central hole for easier threading of thicker and more wires, small size, light weight, and more material savings.

[0009] This application provides a coreless grid-like brushless motor stator, including a cylindrical stator winding ring. The stator winding ring is formed by multiple conductive coils arranged and spliced ​​at intervals along the circumferential direction. The magnetic flux generated by the conductive coils is arranged radially along the stator winding ring. Each conductive coil includes a first conductive strip and a second conductive strip. The first and second conductive strips are stacked on top of each other radially along the stator winding ring. Both the first and second conductive strips are non-straight strip structures. The two ends of the first conductive strip are respectively matched with the two ends of the second conductive strip. The first and second conductive strips are connected to form a semi-circular structure.

[0010] Compared with existing technologies, the coreless grid-mesh brushless motor stator disclosed in this application has the following advantages: First, the conductive coil structure can significantly increase the current density, compensating for the potential decrease in magnetic field strength after removing the iron core; second, the cylindrical stator winding ring design can achieve a more uniform magnetic field distribution, helping to reduce electromagnetic noise and improve operational stability; furthermore, this application also considers the convenience of manufacturing and assembly, that is, by designing the first and second conductive strips as semi-ring structures and matching them at both ends to form a semi-ring, the production process can be simplified while ensuring structural stability; furthermore, the first and second conductive strips are stacked together radially along the stator winding rings, which allows adjacent conductive coils to be arranged more closely, increasing the density of the magnetic field and thus achieving more efficient electromagnetic conversion; finally, due to the absence of an iron core, the weight of the stator is greatly reduced, the power density of the motor is increased, the cogging effect is eliminated, and electromagnetic noise and torque ripple are significantly reduced. Therefore, this structural design not only eliminates the limitations of traditional iron core structures, but also achieves efficient electromagnetic conversion through the optimized arrangement of conductive coils.

[0011] In one possible implementation, the first conductive strip includes a first upper end, a first upper conductive segment, a first middle conductive segment, a first lower conductive segment, and a first lower end, integrally connected from top to bottom. The first upper conductive segment, the first middle conductive segment, and the first lower conductive segment form an outwardly protruding structure. The second conductive strip includes a second upper end, a second upper conductive segment, a second middle conductive segment, a second lower conductive segment, and a second lower end, integrally connected from top to bottom. The second upper conductive segment, the second middle conductive segment, and the second lower conductive segment form an outwardly protruding structure. The first lower end is connected to the second lower end, and the first middle conductive segment and the second middle conductive segment are spaced apart. Compared with the prior art, the conductive ring is simple to manufacture and has a stable structure, ensuring reliable electrical connection and mechanical strength.

[0012] In one possible implementation, both the first upper end and the first lower end are provided with first positioning holes, and both the second upper end and the second lower end are provided with second positioning holes. The first positioning holes on the first lower end and the second positioning holes on the second lower end are matched and positioned with each other. Compared with the prior art, the matching positioning of the positioning holes can ensure that the first conductive strip and the second conductive strip can be accurately aligned during assembly, thereby forming a precise semi-circular structure and improving the connection accuracy and stability between the conductive strips.

[0013] In one possible implementation, the lengths of the first and second central conductive segments are greater than 2 mm. Compared to existing technologies, by setting the length range of the central conductive segments, the overall size and shape of the conductive coil can be effectively controlled; a range greater than 2 mm ensures sufficient magnetic field strength, which helps optimize the overall structure and performance of the motor. A longer central conductive segment can increase the effective magnetic field area and improve the motor's output power; while a shorter central conductive segment may help reduce the size and weight of the stator.

[0014] In one possible implementation, both the first and second upper ends are connected to an external power source via conductors, and the first and second lower ends are welded together and electrically connected to each other. Compared with existing technologies, this not only improves the stability and reliability of the connection but also simplifies the assembly process, thereby improving production efficiency and product quality.

[0015] In one possible implementation, the conductive rings are covered with an insulating layer. Compared to the prior art, by covering the conductive rings with an insulating layer, electrical isolation between conductive rings and between conductive rings and other components can be ensured, preventing current leakage or short circuits caused by accidental contact.

[0016] In one possible implementation, the stator winding rings have a grid-like structure. Compared with the prior art, this structure not only increases the overall strength of the stator winding rings and improves the utilization rate of the magnetic field, but also improves the uniformity of the magnetic field.

[0017] In one possible implementation, an insulating ring is further included for covering the stator winding rings, the insulating ring being made of epoxy resin or a non-metallic thermally conductive material. Compared with the prior art, by adding an insulating ring, electrical contact between the stator winding rings and the external environment can be effectively prevented, while also improving the structural strength of the stator. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the stator winding ring structure in Embodiment 1;

[0019] Figure 2 This is a schematic diagram of the stator winding rings after they have been unfolded in Example 1.

[0020] Figure 3 for Figure 2 Partial schematic diagram;

[0021] Figure 4 This is a schematic diagram of the conductive coil in Example 1;

[0022] Figure 5 This is a schematic diagram of the stator winding ring structure in Embodiment 2;

[0023] Figure 6 This is a schematic diagram of the stator winding rings after they have been unfolded in Embodiment 2.

[0024] Figure 7 for Figure 6 Partial schematic diagram;

[0025] Figure 8 This is a schematic diagram of the conductive coil in Example 2;

[0026] Figure 9 This is a schematic diagram of the conductive coil in Example 3;

[0027] Figure 10 This is a schematic diagram of the conductive coil in Example 4;

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Stator winding ring; 2. Conductive ring; 21. First conductive bar; 211. First upper end; 212. First upper conductive section; 213. First middle conductive section; 214. First lower conductive section; 215. First lower end; 216. First positioning hole; 22. Second conductive bar; 221. Second upper end; 222. Second upper conductive section; 223. Second middle conductive section; 224. Second lower conductive section; 225. Second lower end. Detailed Implementation

[0030] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0031] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0032] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In traditional brushless motor designs, the stator typically consists of an iron core and enameled wire. While this structure is widely used, it has some inherent technical limitations. Specifically, the combination of the iron core and enameled wire results in slow motor start-up, uneven speed regulation, and significant electromagnetic noise. Furthermore, the motor's operating efficiency is affected by magnetic field harmonics and cogging vibration. Stator leakage flux and significant iron losses further reduce the overall efficiency of the motor. The limitations imposed by the iron core's slots also restrict the use of excessively thick or numerous enameled wires, which to some extent limits improvements in motor performance.

[0034] Failure to address these technical challenges will severely impact the performance and reliability of the entire automation system. First, insufficient precision will directly lead to decreased product quality, increasing scrap rates and rework costs. Second, low energy efficiency will increase operating costs and may shorten system lifespan. In noise-sensitive applications, such as medical equipment or precision instrument manufacturing, electromagnetic noise from motors may interfere with the normal operation of other equipment. In the long run, these issues may limit the application of automation technology in certain demanding fields and hinder technological progress in related industries. Therefore, developing a new motor structure capable of overcoming these limitations is of paramount importance.

[0035] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Example

[0036] See Figures 1 to 4 This application discloses a coreless grid-like brushless motor stator, including a cylindrical stator winding ring 1. The stator winding ring 1 is formed by multiple conductive rings 2 arranged and spliced ​​at intervals along the circumferential direction. The magnetic flux generated by the conductive rings 2 is arranged radially along the stator winding ring 1. The conductive ring 2 includes a first conductive strip 21 and a second conductive strip 22. The first conductive strip 21 and the second conductive strip 22 are stacked on each other radially along the stator winding ring 1. Both the first conductive strip 21 and the second conductive strip 22 are non-straight strip structures. The two ends of the first conductive strip 21 are respectively matched with the two ends of the second conductive strip 22. The first conductive strip 21 and the second conductive strip 22 are connected to form a semi-circular structure.

[0037] As can be seen from the above, firstly, the structure of the conductive coil 2 can significantly increase the current density, compensating for the potential decrease in magnetic field strength after removing the iron core; secondly, the cylindrical stator winding ring 1 design can achieve a more uniform magnetic field distribution, which helps to reduce electromagnetic noise and improve operational stability; in addition, this application also considers the convenience of manufacturing and assembly, that is, by designing the first conductive strip 21 and the second conductive strip 22 as a semi-ring structure and matching them at both ends to form a semi-ring, the production process can be simplified while ensuring the stability of the structure; furthermore, the first conductive strip 21 and the second conductive strip 22 are stacked together radially along the stator winding ring 1. This arrangement allows adjacent conductive coils 2 to be arranged more closely, increasing the density of the magnetic field and thus achieving more efficient electromagnetic conversion; finally, since there is no iron core, the weight of the stator is greatly reduced, the motor volume is reduced, the power density of the motor is increased, the cogging effect is eliminated, and electromagnetic noise and torque ripple are significantly reduced. Therefore, this structural design not only eliminates the limitations of the traditional iron core structure, but also achieves efficient electromagnetic conversion through the optimized arrangement of the conductive coils 2.

[0038] During operation, the current passes through the conductive coil 2 to generate a magnetic field. Due to the special structure and arrangement of the conductive coil 2, the direction of the generated magnetic flux is set along the radial direction of the stator winding ring 1. This design makes the magnetic field distribution more uniform, effectively reduces electromagnetic noise, and improves the operating stability of the motor.

[0039] Specifically, the stator winding ring 1 is made of copper sheet (copper bar). Copper is chosen as the conductive material because it has good conductivity and heat dissipation. The cylindrical stator winding ring 1 design is conducive to achieving a more compact structure while ensuring a uniform distribution of the magnetic field. The first conductive bar 21 and the second conductive bar 22 are designed as a semi-ring structure and connected to each other, which not only simplifies the manufacturing process but also ensures the stability of the structure and its conductivity.

[0040] When in use, the stator winding ring 1 can be fixed inside the motor housing and used in conjunction with the rotor; when energized, the current passes through the conductive ring 2 to generate a radial magnetic field, which interacts with the permanent magnet on the rotor, thereby generating torque to drive the rotor to rotate; since the traditional iron core structure is removed, this design can significantly reduce iron loss, improve motor efficiency, and achieve faster start-up speed and smoother speed regulation.

[0041] In this embodiment, the first conductive strip 21 includes a first upper end 211, a first upper conductive segment 212, a first middle conductive segment 213, a first lower conductive segment 214, and a first lower end 215, which are integrally connected from top to bottom. The first upper conductive segment 212, the first middle conductive segment 213, and the first lower conductive segment 214 form an outwardly protruding structure. The second conductive strip 22 includes a second upper end 221, a second upper conductive segment 222, a second middle conductive segment 223, a second lower conductive segment 224, and a second lower end 225, which are integrally connected from top to bottom. The second upper conductive segment 222, the second middle conductive segment 223, and the second lower conductive segment 224 form an outwardly protruding structure. The first upper end 211 matches the second upper end 221, and the first lower end 215 is connected to the second lower end 225. The first middle conductive segment 213 and the second middle conductive segment 223 are spaced apart. First, both the first conductive strip 21 and the second conductive strip 22 are semi-ring structures, forming a semi-ring structure through the connection of their lower ends. Second, the upper, middle, and lower conductive sections of the first conductive strip 21 and the second conductive strip 22 form an outwardly protruding structure. This protruding structure increases the surface area of ​​the conductive strip, which is beneficial for heat dissipation and magnetic field formation. The outwardly protruding structure also increases the rigidity of the conductive strip and improves the overall strength of the stator winding ring 1. Finally, the conductive ring 2 designed in this way is simple to manufacture and has a stable structure. In practical applications, high-conductivity pure copper material can be used to make the conductive strip to ensure good conductivity.

[0042] In this embodiment, both the first upper end 211 and the first lower end 215 are provided with first positioning holes 216, and both the second upper end 221 and the second lower end 225 are provided with second positioning holes. The first positioning holes 216 and the second positioning holes are matched and positioned with each other. Specifically, the first positioning holes 216 are provided on the first upper end 211 and the first lower end 215, and the second positioning holes are provided on the second upper end 221 and the second lower end 225. The positions of these positioning holes are precisely calculated and designed to ensure perfect matching during assembly. When the first conductive strip 21 and the second conductive strip 22 are connected, the relative positions of the two conductive strips can be guided and fixed through these positioning holes. For example, positioning pins or other suitable connectors can be used to pass through these positioning holes to precisely fix the first conductive strip 21 and the second conductive strip 22 together. This method not only improves the assembly accuracy but also increases the stability of the connection. This positioning method also simplifies the assembly process; since the positioning holes provide clear reference points, assembly personnel or automated equipment can more easily align and connect the conductive strips; this not only improves production efficiency but also reduces assembly defects caused by human error. As a preferred embodiment, the first positioning hole 216 and the second positioning hole can be designed as circular, with the diameter selectable according to actual needs; the edges of the positioning holes can be chamfered to facilitate the insertion of the positioning pins. Therefore, the design of the positioning holes ensures precise positioning of each part of the stator, thereby reducing performance fluctuations caused by component position deviations.

[0043] In this embodiment, a longer first middle conductive segment 213 and a longer second middle conductive segment 223 are selected. The longer middle conductive segment can increase the effective magnetic field area, improve the output power of the motor, and at the same time increase the heat dissipation area, which helps to reduce the temperature of the stator during operation and improve the reliability and service life of the motor.

[0044] In this embodiment, both the first upper end 211 and the second upper end 221 are connected to an external power source via conductors. The first lower end 215 and the second lower end 225 are welded together and electrically connected. Specifically, connecting the first upper end 211 and the second upper end 221 to the external power source via conductors ensures a stable current input. Simultaneously, welding the first lower end 215 and the second lower end 225 and maintaining electrical connection forms a complete circuit loop, effectively reducing contact resistance and improving current conduction efficiency. Welding creates a metallurgical bond between metals, making it less susceptible to external factors such as vibration and temperature changes, thus ensuring a long-term stable electrical connection, which is crucial for the long-term stable operation of the motor. Since the upper ends are connected to the external power source via conductors, and the lower ends are connected by welding, the entire connection process is simpler and more direct, reducing complex wiring steps and improving production efficiency while reducing the risk of assembly errors.

[0045] In this embodiment, the outer surface of the conductive ring 2 is covered with an insulating layer. Firstly, the insulating layer protects the surface of the conductive ring 2 from oxidation and corrosion, extending its service life. Secondly, the insulating layer reduces electromagnetic interference between the conductive rings 2, improving the motor's operational stability. Furthermore, the insulating layer can reduce the surface temperature of the conductive ring 2 to some extent, helping to improve the stator's heat dissipation performance. Specifically, the insulating layer can be designed in various ways. For example, high-temperature resistant and wear-resistant insulating materials such as polyimide and polytetrafluoroethylene can be used. The thickness of the insulating layer can be adjusted according to actual needs, typically between 0.05mm and 1mm, to ensure sufficient insulation without significantly increasing the overall size of the conductive ring 2. The insulating layer can also be coated using processes such as impregnation, spraying, or hot pressing.

[0046] In this embodiment, the stator winding ring 1 has a grid-like structure. The grid structure gives the stator winding ring 1 higher mechanical strength and resistance to deformation; the grid structure increases the surface area, which is conducive to heat dissipation and improves the heat dissipation efficiency of the stator; the staggered conductive rings 2 help to form a more uniform magnetic field distribution and reduce magnetic field distortion; the grid structure can reduce material usage while maintaining strength and optimize space utilization.

[0047] In this embodiment, the motor stator also includes an insulating ring for covering the stator winding ring 1. The insulating ring is made of epoxy resin or a non-metallic thermally conductive material. Specifically, the insulating ring can be made of epoxy resin or a non-metallic thermally conductive material. Epoxy resin has excellent insulation properties and mechanical strength, which can effectively protect the stator winding ring 1 from the influence of the external environment. Non-metallic thermally conductive materials can improve the heat dissipation effect of the stator while ensuring insulation performance, which helps to reduce the temperature of the stator during operation. In the manufacturing process, the stator winding ring 1 can be placed in a mold first, and then liquid epoxy resin or other selected non-metallic thermally conductive material can be injected. After the material cures, an insulating ring that tightly covers the stator winding ring 1 can be formed. This method can ensure that there are no gaps between the insulating ring and the stator winding ring 1, thereby maximizing the insulation and heat conduction effects.

[0048] This embodiment also provides a manufacturing process for the coreless grid mesh brushless motor stator as described above, including the following steps:

[0049] Step 1: Prepare high-purity electrolytic copper or aluminum plates;

[0050] The second step involves processing multiple first conductive strips 21 and second conductive strips 22 using equipment and molds.

[0051] Third step: Arrange multiple first conductive strips 21 in a group along the horizontal direction;

[0052] Step 4: Insulate the first set of conductive strips 21;

[0053] Step 5: Arrange multiple second conductive strips 22 in a horizontal direction as a group;

[0054] Step 6: Insulate the second set of conductive strips 22;

[0055] Step 7: Stack a set of first conductive strips 21 on a set of second conductive strips 22 through positioning holes, and use a mold to splice them along the circumferential direction to form a cylindrical stator winding ring 1;

[0056] Step 8: The lower end of the conductive strip is welded and electrically connected to form a conductive ring 2, and the upper end of the conductive strip is led out through a conductor to form a star connection or a delta connection.

[0057] Step 9: Use epoxy resin or other non-metallic materials with high thermal conductivity to encapsulate and mold the stator.

[0058] The coreless grid-mesh brushless motor stator formed by the above manufacturing process can achieve the following technical effects:

[0059] 1. Reduced iron loss: Due to the adoption of a coreless structure, the iron loss caused by the iron core in the traditional stator is greatly reduced, thereby improving the overall efficiency of the motor, reducing weight, shrinking size, and saving more materials.

[0060] II. Reduced electromagnetic noise: The coreless structure reduces magnetic field harmonics, and the special design of the conductive strips also helps to form a more uniform magnetic field distribution, thus significantly reducing electromagnetic noise.

[0061] 3. Improved heat dissipation: The grid structure of the stator increases the heat dissipation area, which is conducive to the rapid dissipation of heat, thereby improving the working efficiency and service life of the motor.

[0062] IV. Enhanced Mechanical Strength: The special structural design and mesh structure of the conductive strip enhance the overall rigidity and strength of the stator winding ring 1, improving the reliability of the motor.

[0063] V. Optimized magnetic field distribution: The structural design of the conductive strip helps to form a more uniform magnetic field distribution, reduces magnetic field harmonics, and thus improves the operating stability and efficiency of the motor.

[0064] Sixth, it achieves advantages such as small size, light weight, high efficiency, high power density, high precision, large central hole to allow thicker or more cables to pass through, improves the flexibility and safety of motor layout, and makes the overall product look more concise and clean.

[0065] VII. Application Areas: Applicable to high-end medical, robotics, automation, new energy vehicles, aerospace and other fields. Example

[0066] like Figures 5 to 8 As shown, the difference between this embodiment and Embodiment 1 is that a shorter first middle conductive segment 213 and a shorter second middle conductive segment 223 are selected. The shorter middle conductive segment helps to reduce the size and weight of the stator, which is beneficial for the miniaturization of the motor. Example

[0067] like Figure 9 As shown, the difference between this embodiment and Embodiment 1 is that a first upper end 211 and a second upper end 221 of a conductive ring 2 are spaced apart, and the first upper end 211 of the conductive ring 2 is positioned and matched with the second upper end 221 of the adjacent conductive ring 2. Example

[0068] like Figure 10 As shown, the difference between this embodiment and Embodiment 3 is that a shorter first middle conductive segment 213 and a shorter second middle conductive segment 223 are selected.

[0069] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0070] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A coreless grid-mesh brushless motor stator, characterized in that, The stator winding ring (1) is cylindrical. The stator winding ring (1) is formed by multiple conductive rings (2) arranged and spliced ​​at intervals along the circumferential direction. The magnetic flux generated by the conductive rings (2) is arranged radially along the stator winding ring (1). The conductive rings (2) include a first conductive strip (21) and a second conductive strip (22). The first conductive strip (21) and the second conductive strip (22) are stacked on each other radially along the stator winding ring (1). The first conductive strip (21) and the second conductive strip (22) are both non-straight strip structures. The two ends of the first conductive strip (21) are respectively matched with the two ends of the second conductive strip (22). The first conductive strip (21) and the second conductive strip (22) are connected to form a semi-circular structure.

2. The coreless grid-mesh brushless motor stator according to claim 1, characterized in that, The first conductive strip (21) includes a first upper end (211), a first upper conductive segment (212), a first middle conductive segment (213), a first lower conductive segment (214), and a first lower end (215) integrally connected from top to bottom. The first upper conductive segment (212), the first middle conductive segment (213), and the first lower conductive segment (214) form an outwardly protruding structure. The second conductive strip (22) includes a second upper end integrally connected from top to bottom. (221), second upper conductive segment (222), second middle conductive segment (223), second lower conductive segment (224) and second lower end (225), the second upper conductive segment (222), the second middle conductive segment (223) and the second lower conductive segment (224) form an outward protruding structure, the first lower end (215) is connected to the second lower end (225), and the first middle conductive segment (213) and the second middle conductive segment (223) are spaced apart.

3. The coreless grid-mesh brushless motor stator according to claim 2, characterized in that, The first upper end (211) and the first lower end (215) are each provided with a first positioning hole (216), and the second upper end (221) and the second lower end (225) are each provided with a second positioning hole. The first positioning hole (216) of the first lower end (215) and the second positioning hole of the second lower end (225) are matched and positioned with each other.

4. The coreless grid-mesh brushless motor stator according to claim 2, characterized in that, The lengths of the first middle conductive segment (213) and the second middle conductive segment (223) are greater than 2 mm.

5. The coreless grid-mesh brushless motor stator according to claim 2, characterized in that, The first upper end (211) and the second upper end (221) are both connected to an external power source through a conductor, and the first lower end (215) and the second lower end (225) are welded together and electrically connected to each other.

6. The coreless grid-mesh brushless motor stator according to claim 1, characterized in that, The outer surface of the conductive ring (2) is covered with an insulating layer.

7. The coreless grid-mesh brushless motor stator according to claim 1, characterized in that, The stator winding ring (1) has a grid-like structure.

8. The coreless grid-mesh brushless motor stator according to claim 1, characterized in that, It also includes an insulating ring for covering the stator winding ring (1), the insulating ring being made of epoxy resin or a non-metallic thermally conductive material.

9. The coreless grid-mesh brushless motor stator according to claim 1, characterized in that, The stator winding ring (1) is made of copper plate, aluminum plate or highly conductive material.

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