A segmented stator

Abstract

This utility model belongs to the field of motor technology, specifically relating to a segmented stator. This utility model utilizes grain-oriented silicon steel to create a segmented stator, comprising multiple U-shaped iron cores evenly arranged circumferentially. Each U-shaped iron core includes multiple U-shaped iron sheets stacked radially. The edges of the teeth of the U-shaped iron cores are flush, and gaps are left between the teeth of adjacent U-shaped iron cores, which are fixedly connected by insulating clips. The yokes of all U-shaped iron cores abut against the stator housing. Each U-shaped iron core is equipped with a winding coil, and the gaps between adjacent U-shaped iron cores, insulating clips, and the stator housing are filled with potting compound. This utility model maximizes the advantages of grain-oriented silicon steel while optimizing the motor structure and manufacturability, comprehensively improving the overall performance of the motor, further highlighting the potential application value of grain-oriented silicon steel as a substitute for non-grained silicon steel, and promoting the development of motor technology towards high efficiency and high power density.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a segmented stator. Background Technology

[0002] With the development of my country's industrial technology, industries using electric motors as the main drive structure have developed rapidly, and they are widely used in servo actuators in automobiles, aircraft, and other fields. Currently, improving the power density and efficiency of electric motors is a major development direction and has attracted much attention. Using grain-oriented silicon steel to manufacture motor stators is a new development trend.

[0003] The orientation of grain-oriented silicon steel is divided into two directions: the easy-to-magnetize direction (orientation direction) and the difficult-to-magnetize direction (perpendicular to the orientation direction). In the easy-to-magnetize direction, the iron loss is only one-third that of traditional non-oriented silicon steel, and its magnetic field strength can reach 2.0T, about 10% higher than that of non-oriented silicon steel. However, in the difficult-to-magnetize direction, its iron loss, permeability, and other properties are extremely poor, far inferior to those of non-oriented silicon steel. Therefore, designing special magnetic circuit structures based on the characteristics of grain-oriented silicon steel can improve motor performance to a certain extent, thus grain-oriented silicon steel has the potential to replace non-oriented silicon steel in the field of motor manufacturing.

[0004] Because the magnetic field lines of the motor stator teeth are all radial (along the direction of the teeth), perfectly matching the easy magnetization direction of oriented silicon steel, current patents in the field of motors mainly focus on stator teeth. In existing technology, the motor stator teeth use oriented silicon steel, while the motor yoke uses non-oriented silicon steel, ultimately improving motor performance through splicing. In Chinese patent document (Publication No.: CN201922182786.4, Publication Date: 2021.01.12), the stator core body is made of stacked oriented silicon steel sheets, with the easy magnetization direction of both the yoke and teeth being radial. Because the magnetic field lines of the yoke are in a difficult magnetization direction, this approach deteriorates motor performance. In Chinese patent document (Publication No.: CN201711476191.9, Publication Date: 2018.06.22), multiple U-shaped cores composed of stacked oriented silicon steel sheets are bonded together to form a ring-shaped oriented silicon steel stator core, with both ends of the U-shaped core protruding inwards. Although this patent can make full use of oriented silicon steel and the internal protrusions can act as slot wedges to fix the winding, its winding process is relatively complex and the slot fill factor is difficult to improve. At the same time, the inward protrusions at both ends will degrade the motor performance.

[0005] In view of the above, this utility model is hereby proposed. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a segmented stator.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A segmented stator includes multiple U-shaped iron cores evenly arranged circumferentially. Each U-shaped iron core includes multiple U-shaped iron sheets stacked radially. The edges of the teeth of the U-shaped iron cores are flush, and there is a gap between the teeth of adjacent U-shaped iron cores. They are fixedly connected by insulating clips. The yokes of all U-shaped iron cores abut against the stator housing. Each U-shaped iron core is provided with a winding coil. The gaps between adjacent U-shaped iron cores, insulating clips, and stator housing are filled with potting compound.

[0008] Specifically, each of the U-shaped iron sheets is prepared by winding oriented silicon steel strip.

[0009] Specifically, the teeth and yoke of the U-shaped iron core are of equal thickness, ensuring a relatively uniform distribution of the internal magnetic field. Compared to some traditional permanent magnet synchronous motors and AC motors, there is no problem of magnetic field oversaturation in the yoke. Furthermore, based on the principle of magnetic flux continuity, the teeth and yoke of the U-shaped iron core are designed to have equal thickness. Specifically, the tooth width is set according to the saturation magnetic flux density of silicon steel (e.g., 1.5-1.8T), and the height of the yoke is equal to that of the teeth, ensuring uniform magnetic flux distribution. The lateral width of the yoke is designed to be 60%-70% of the pole pitch, balancing the magnetic circuit length and material usage, ensuring consistent cross-sectional area of ​​the magnetic flux path, and avoiding the magnetic saturation problem caused by insufficient cross-sectional area of ​​the yoke in traditional motors. Through the symmetrical magnetic circuit structure, the magnetic field is evenly distributed in the teeth and yoke (magnetic flux density difference <5%), significantly reducing local magnetic leakage and iron loss.

[0010] Specifically, the slots of the U-shaped iron core are completely open, allowing the winding coils to be assembled using a heat-shrinking process after they are arranged; the teeth of the U-shaped iron core are flush, completely eliminating the tooth tip protrusions or mechanical locking structures of traditional stator iron cores. The smooth edge design makes the iron core slots form an unobstructed channel, avoiding scratches on the insulation layer or deformation of the copper wires caused by mechanical interference during the installation of the winding coils, reducing the risk of local magnetic flux saturation. Combined with the rolling direction control of the grain-oriented silicon steel, it ensures that the main magnetic flux is efficiently conducted along the preset path.

[0011] Specifically, the insulating buckle has grooves on the side near the U-shaped iron core that are adapted to the shape of the teeth of the U-shaped iron core. The teeth of the adjacent U-shaped iron core are fixed by the buckle and a constraint is formed on the winding coil.

[0012] Specifically, the distance between the teeth of adjacent U-shaped iron cores is not equidistant, forming equidistant slots. The spacing is designed in a gradient manner based on the results of thermo-magnetic coupling simulation (the gap width is linearly increased between 2mm and 5mm). Combined with the magnetic anisotropy of oriented silicon steel, the equidistant slots can directionally optimize the magnetic flux path and improve the utilization rate of magnetic properties.

[0013] Specifically, a support bracket for accommodating insulating clips is provided between the teeth of adjacent U-shaped iron cores; furthermore, the tops of the teeth of adjacent U-shaped iron cores are connected to each other through insulating clips to form a tension; after all winding coils are wound and the potting compound is cured, a rectangular support bracket with slots at both ends is placed between them (the potting compound is not fully cured when the support bracket is placed), the support bracket provides an outward thrust, which balances the tension of the insulating clips; finally, a housing is installed on the yoke to integrate and connect all U-shaped iron cores; the housing simultaneously applies an inward constraint force on the U-shaped iron cores, which, together with the thrust of the support bracket, forms a stable force-balanced structure.

[0014] Furthermore, the support bracket is made of glass fiber reinforced nylon 66 composite material.

[0015] Specifically, the potting compound is a silicone thermally conductive potting compound.

[0016] Specifically, it also includes a toothed bracket, which has an inner shell that can accommodate the rotor. The inner shell abuts against an insulating buckle. The outer circumference of the inner shell is evenly distributed with slots for inserting U-shaped iron cores and fixing teeth for fixing the winding coils. The toothed bracket is made of aluminum alloy.

[0017] In addition, a method for manufacturing a segmented stator as described above is also provided, including the following steps: Step 1: Take a wide-width oriented silicon steel strip (thickness 0.23-0.30mm), and wind it layer by layer in an elliptical trajectory using a four-axis servo winding machine. Insulating adhesive is sprayed synchronously between layers. After winding to the set number of layers, pressurize and cure (usually 80-120 layers) to form an elliptical cylinder. Step 2: Using a fiber laser (1.2kW power, 1070nm wavelength), under water cooling conditions, control the kerf width to ≤0.2mm, cut the elliptical cylinder into two U-shaped iron cores along its minor axis. Locally anneal the teeth of the U-shaped iron cores (annealing temperature 450-550℃, time 10-15min) to eliminate mechanical stress. Then, perform magnetorheological polishing on the cut surfaces of the U-shaped iron core teeth using a polishing slurry containing carbonyl iron powder mixed with diamond abrasive. The polishing slurry, by mass percentage, is as follows: carbonyl iron powder (CIP): 20%-30%, diamond abrasive: 5%-15%, carrier fluid (usually deionized water-based): approximately 55%-75%, stabilizer / dispersant: 1%-3%, rust inhibitor: 0.5%-1.5%. Step 3: The winding coil is wound using a mold with the same tooth shape as the U-shaped iron core. After vacuum impregnation, the winding coil is thermally expanded and assembled onto the U-shaped iron core at 110℃-130℃. The specific steps for vacuum impregnation of the winding coil are as follows: Step 3.1, Preparation and Preheating: First clean the workpiece, then dry it at 100℃-120℃ for 1-2 hours to completely remove internal moisture; Step 3.2, Vacuuming: After immersing the workpiece in the resin, draw a high vacuum (>-0.095MPa) in the sealed container and maintain it for 10-30 minutes to remove air from the pores and resin; Step 3.3, Pressure Impregnation: Apply a positive pressure of 0.4-0.8 MPa to the tank and maintain it for 10-30 minutes. Use the pressure difference to force the resin into every tiny pore. Step 3.4 Cleaning: After pressurization, remove the workpiece and rinse the surface of the workpiece with clean water to remove excess resin.

[0018] Step 3.5, Curing: Immerse the cleaned workpiece in hot water at 80-95℃ for 15-30 minutes, or heat the workpiece to 100-120℃ in an oven and keep it at that temperature for 1-2 hours to allow the internal resin to fully cure. Step 4: Arrange multiple U-shaped iron cores with installed winding coils evenly along the circumference, and fix the teeth of adjacent U-shaped iron cores together with insulating buckles to form segmented iron cores; Step 5: Inject potting compound between adjacent U-shaped cores on the segmented iron core, and then fit the stator housing onto the segmented iron core after the compound injection to form a segmented stator; the specific steps for injecting the potting compound are as follows: Step 5.1, Preparation and Preheating: After cleaning the segmented iron core, preheat it to 80-100℃ to remove moisture; Step 5.2, Injection: Under vacuum pressure, inject the mixed potting compound into the gaps between adjacent U-shaped iron cores, ensuring complete filling; Step 5.3, Gel and Assembly: When the potting colloid has initially gelled (the surface has dried, and it has been left to stand at about 40-60℃ for 30-120 minutes) but has not been completely cured, the stator shell is inserted to prevent the colloid from being squeezed out. Step 5.4 Final Curing: After the segmented iron core is encased, it is placed in an oven for final curing. A stepped temperature increase is used, first curing at 80-90℃ for 1-2 hours, and then curing at 100-120℃ for 2-4 hours to ensure that the colloid is completely cured and obtains the best performance.

[0019] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: This invention's segmented stator fully leverages the material advantages of grain-oriented silicon steel. By utilizing a winding process, it ensures that the easy magnetization direction of the motor's tooth yoke aligns with the direction of the magnetic field lines, and that the thickness of the tooth and yoke remains consistent. This solves the yoke saturation problem caused by the yoke thickness being half the tooth width in existing grain-oriented silicon steel stator patents. It also utilizes the high permeability and low iron loss characteristics of grain-oriented silicon steel to improve motor performance. Simultaneously, the U-shaped core reduces winding difficulty, increases the winding slot fill factor, and reduces copper loss. Furthermore, this invention maximizes the advantages of grain-oriented silicon steel while optimizing the motor structure and manufacturability, comprehensively improving the overall performance of the motor. It further highlights the potential application value of grain-oriented silicon steel as a replacement for non-grained silicon steel, driving motor technology towards high efficiency and high power density. Attached Figure Description

[0020] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the U-shaped iron core of this utility model; Figure 2 This is a schematic diagram of the connection between the U-shaped iron core and the insulating buckle of this utility model; Figure 3 This is a first schematic diagram of the segmented stator structure of this utility model; Figure 4 This is a second schematic diagram of the segmented stator structure of this utility model.

[0023] Wherein: 1 is the U-shaped iron core; 2 is the insulating buckle; 3 is the stator shell; 4 is the winding coil; 5 is the support bracket; 6 is the toothed bracket; 61 is the inner shell; 62 is the fixed tooth; 7 is the rotor. Detailed Implementation

[0024] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The embodiments described below do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Example 1 See Figure 1-4 As shown, this embodiment provides a segmented stator, including multiple U-shaped iron cores 1 evenly arranged circumferentially. Each U-shaped iron core 1 includes multiple U-shaped iron sheets stacked radially. The edges of the teeth of the U-shaped iron core 1 are flush, and there is a gap between the teeth of adjacent U-shaped iron cores 1. They are fixedly connected by insulating buckles 2. The yokes of all U-shaped iron cores 1 abut against the stator housing 3. Each U-shaped iron core 1 is provided with a winding coil 4. The gaps between adjacent U-shaped iron cores 1, insulating buckles 2 and stator housing 3 are filled with potting compound.

[0027] Specifically, each of the U-shaped iron sheets is prepared by winding oriented silicon steel strip.

[0028] Specifically, the teeth and yoke of the U-shaped iron core 1 are of equal thickness, ensuring a relatively uniform distribution of the internal magnetic field. Compared with some traditional permanent magnet synchronous motors and AC motors, there is no problem of magnetic field oversaturation in the yoke. Furthermore, based on the principle of magnetic flux continuity, the teeth and yoke of the U-shaped iron core 1 are designed to have equal thickness. Specifically, the tooth width is set according to the saturation magnetic flux density of silicon steel (e.g., 1.5-1.8T), and the height of the yoke is equal to that of the teeth to ensure uniform magnetic flux distribution. The lateral width of the yoke is designed according to 60%-70% of the pole pitch to balance the magnetic circuit length and material usage, ensuring that the cross-sectional area of ​​the magnetic flux path is consistent. This avoids the magnetic saturation problem caused by insufficient cross-sectional area of ​​the yoke in traditional motors. Through the symmetrical magnetic circuit structure, the magnetic field is evenly distributed in the teeth and yoke (magnetic flux density difference <5%), significantly reducing local magnetic leakage and iron loss.

[0029] Specifically, the slot of the U-shaped iron core 1 is completely open, allowing the winding coils to be assembled using a heat-shrinking process after the coils are arranged. The teeth of the U-shaped iron core 1 are flush, completely eliminating the tooth tip protrusions or mechanical locking structures of traditional stator iron cores. The smooth edge design makes the iron core slots form an unobstructed channel, avoiding scratches on the insulation layer or deformation of the copper wires caused by mechanical interference during the installation of the winding coils, reducing the risk of local magnetic flux saturation. Combined with the rolling direction control of the grain-oriented silicon steel, it ensures that the main magnetic flux is efficiently conducted along the preset path.

[0030] Specifically, the insulating buckle 2 has grooves on the side near the U-shaped iron core 1 that are adapted to the shape of the teeth of the U-shaped iron core 1, which fix the teeth of the adjacent U-shaped iron core 1 by means of a buckle and form a constraint on the winding coil 4.

[0031] Specifically, the distance between the teeth of adjacent U-shaped iron cores 1 is not equidistant, forming equidistant slots. The spacing is designed in a gradient manner based on the results of thermo-magnetic coupling simulation (the gap width is linearly increased between 2mm and 5mm). Combined with the magnetic anisotropy of oriented silicon steel, the equidistant slots can optimize the magnetic flux path and improve the utilization rate of magnetic properties.

[0032] Specifically, the potting compound is a silicone thermally conductive potting compound.

[0033] Specifically, it also includes a toothed bracket 6, which has an inner shell 61 that can accommodate the rotor 7. The inner shell 61 abuts against the insulating buckle 2. The outer periphery of the inner shell 6 is evenly distributed with slots for inserting the U-shaped iron core 1 and fixing teeth 62 for fixing the winding coil 4.

[0034] Example 2 The difference between this embodiment and Embodiment 1 is that this embodiment does not install the toothed bracket 6. Instead, a support bracket 5 is provided between the teeth of adjacent U-shaped iron cores 1 to accommodate the insulating buckle 2. Furthermore, the tops of the teeth of adjacent U-shaped iron cores 1 are connected to each other through the insulating buckle 2 to form a tension. After all the winding coils are wound and the potting compound is cured, a rectangular support bracket 5 with slots at both ends is placed between them (when the support bracket 5 is placed, the potting compound is not completely cured). The support bracket 5 provides an outward thrust, which balances the tension of the insulating buckle 2. Finally, a housing 3 is installed on the yoke to integrate and connect all the U-shaped iron cores 1. The housing 3 simultaneously applies an inward constraint force on the U-shaped iron cores 1, which, together with the thrust of the support bracket 5, forms a stable force-balanced structure.

[0035] Furthermore, the support bracket 5 is made of glass fiber reinforced nylon 66 composite material.

[0036] Example 3 This embodiment provides a method for manufacturing a segmented stator as described in Embodiment 1, including the following steps: Step 1: Take a wide-width oriented silicon steel strip (thickness 0.23-0.30mm), and wind it layer by layer in an elliptical trajectory using a four-axis servo winding machine. Insulating adhesive is sprayed synchronously between layers. After winding to 90 layers, pressurize and cure to form an elliptical cylinder. Step 2: Using a fiber laser (power 1.2kW, wavelength 1070nm), under water cooling conditions, control the kerf width to ≤0.2mm, cut the elliptical cylinder along its minor axis into two U-shaped iron cores 1. Then, locally anneal the teeth of the U-shaped iron cores 1 (annealing temperature 450℃, time 15min) to eliminate mechanical stress. Next, perform magnetorheological polishing on the cut surfaces of the U-shaped iron cores 1 using a polishing slurry containing carbonyl iron powder mixed with diamond abrasive. The polishing slurry, by mass percentage, is as follows: carbonyl iron powder (CIP): 20%, diamond abrasive: 15%, carrier fluid (usually deionized water-based): approximately 63%, stabilizer / dispersant: 1.5%, rust inhibitor: 0.5%. Step 3: Use a mold with the same tooth shape as the U-shaped iron core 1 to wind the winding coil 4. After vacuum impregnation, the winding coil 4 is thermally expanded at 130°C and assembled onto the U-shaped iron core 1. The specific steps for vacuum impregnation of the winding coil are as follows: Step 3.1, Preparation and Preheating: First clean the workpiece, then dry it at 120℃ for 1 hour to completely remove internal moisture; Step 3.2, Vacuuming: After immersing the workpiece in the resin, draw a high vacuum (>-0.095MPa) in the sealed container and maintain it for 10 minutes to remove air from the pores and resin; Step 3.3, Pressure Impregnation: Apply a positive pressure of 0.8 MPa to the tank and maintain it for 10 minutes. Use the pressure difference to force the resin into every tiny pore. Step 3.4 Cleaning: After pressurization is completed, remove the workpiece and rinse off any excess resin from the workpiece surface.

[0037] Step 3.5, Curing: Immerse the cleaned workpiece in hot water at 80℃ for 30 minutes, or heat the workpiece to 120℃ in an oven and keep it at that temperature for 1 hour to allow the internal resin to fully cure. Step 4: Arrange multiple U-shaped iron cores 1 with the installed winding coils 4 evenly along the circumference, and fix the teeth of adjacent U-shaped iron cores 1 with insulating buckles 2 to form segmented iron cores; Step 5: Inject potting compound between adjacent U-shaped iron cores 1 on the segmented iron core, and then fit the stator housing 3 onto the segmented iron core after the potting compound is injected to form a segmented stator; The specific steps for injecting the potting compound are as follows: Step 5.1, Preparation and Preheating: After cleaning the segmented iron core, preheat it to 100°C to remove moisture; Step 5.2, Injection: Under vacuum pressure, inject the mixed potting compound into the gaps between adjacent U-shaped iron cores, ensuring complete filling; Step 5.3, Gel and Assembly: When the potting colloid has initially gelled (the surface has dried, and it has been left to stand at about 60°C for 30 minutes) but has not been completely cured, the stator housing is inserted to prevent the colloid from being squeezed out. Step 5.4 Final Curing: After the segmented iron core is encased, it is placed in an oven for final curing. A stepped temperature increase is used, first curing at 90℃ for 1 hour, and then curing at 120℃ for 2 hours to ensure that the colloid is completely cured and obtains the best performance.

[0038] Example 4 This embodiment provides a method for manufacturing a segmented stator as described in Embodiment 1, including the following steps: Step 1: Take a wide-width oriented silicon steel strip (thickness 0.23-0.30mm), and wind it layer by layer in an elliptical trajectory using a four-axis servo winding machine. Insulating adhesive is sprayed synchronously between layers. After winding to 110 layers, pressurize and cure to form an elliptical cylinder. Step 2: Using a fiber laser (1.2kW power, 1070nm wavelength), and under water cooling conditions, control the kerf width to ≤0.2mm, cut the elliptical cylinder into two U-shaped iron cores 1 along the minor axis. Locally anneal the teeth of the U-shaped iron cores 1 (annealing temperature 550℃, time 10min) to eliminate mechanical stress. Then, perform magnetorheological polishing on the cut surfaces of the U-shaped iron cores 1 using a polishing slurry containing carbonyl iron powder mixed with diamond abrasive. The polishing slurry, by mass percentage, is as follows: carbonyl iron powder (CIP): 25.5%, diamond abrasive: 8%, carrier fluid (usually deionized water-based): approximately 62%, stabilizer / dispersant: 3%, rust inhibitor: 1.5%. Step 3: Use a mold with the same tooth shape as the U-shaped iron core 1 to wind the winding coil 4. After vacuum impregnation, the winding coil 4 is thermally expanded at 110°C and assembled onto the U-shaped iron core 1. The specific steps for vacuum impregnation of the winding coil are as follows: Step 3.1, Preparation and Preheating: First clean the workpiece, then dry it at 100℃ for 2 hours to completely remove internal moisture; Step 3.2, Vacuuming: After immersing the workpiece in the resin, draw a high vacuum (>-0.095MPa) in the sealed container and maintain it for 30 minutes to remove air from the pores and resin; Step 3.3, Pressure Impregnation: Apply a positive pressure of 0.4 MPa to the tank and maintain it for 30 minutes. Use the pressure difference to force the resin into every tiny pore. Step 3.4 Cleaning: After pressurization is completed, remove the workpiece and rinse off any excess resin from the workpiece surface.

[0039] Step 3.5, Curing: Immerse the cleaned workpiece in hot water at 95℃ for 15 minutes, or heat the workpiece to 100℃ in an oven and keep it at that temperature for 2 hours to allow the internal resin to fully cure. Step 4: Arrange multiple U-shaped iron cores 1 with the installed winding coils 4 evenly along the circumference, and fix the teeth of adjacent U-shaped iron cores 1 with insulating buckles 2 to form segmented iron cores; Step 5: Inject potting compound between adjacent U-shaped iron cores 1 on the segmented iron core, and then fit the stator housing 3 onto the segmented iron core after the potting compound is injected to form a segmented stator; The specific steps for injecting the potting compound are as follows: Step 5.1, Preparation and Preheating: After cleaning the segmented iron core, preheat it to 80°C to remove moisture; Step 5.2, Injection: Under vacuum pressure, inject the mixed potting compound into the gaps between adjacent U-shaped iron cores, ensuring complete filling; Step 5.3, Gel and Assembly: When the potting colloid has initially gelled (the surface has dried, and it has been left to stand at about 40°C for 120 minutes) but has not been completely cured, the stator shell is fitted in to prevent the colloid from being squeezed out. Step 5.4, Final Curing: After the segmented iron core is encased, it is placed in an oven for final curing. A stepped temperature increase is used, first curing at 80℃ for 2 hours, and then curing at 100℃ for 4 hours to ensure that the colloid is completely cured and obtains the best performance.

[0040] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0041] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A segmented stator, characterized in that, It includes multiple U-shaped iron cores (1) evenly arranged in the circumferential direction. Each U-shaped iron core (1) includes multiple U-shaped iron sheets stacked in the radial direction. The edges of the teeth of the U-shaped iron core (1) are flush. There is a gap between the teeth of adjacent U-shaped iron cores (1) and they are fixedly connected by insulating buckles (2). The yoke of all U-shaped iron cores (1) abuts against the stator housing (3). Each U-shaped iron core (1) is provided with a winding coil (4). The gap between adjacent U-shaped iron cores (1), insulating buckles (2) and stator housing (3) is filled with potting compound.

2. The segmented stator according to claim 1, characterized in that, The insulating buckle (2) has a groove on the side near the U-shaped iron core (1) that matches the shape of the teeth of the U-shaped iron core (1) to fix the teeth of the adjacent U-shaped iron core (1).

3. The segmented stator according to claim 1, characterized in that, The distance between the teeth of adjacent U-shaped iron cores (1) is not equidistant.

4. The segmented stator according to claim 1, characterized in that, A support bracket (5) for adapting the insulating buckle (2) is also provided between the teeth of the adjacent U-shaped iron core (1).

5. The segmented stator according to claim 4, characterized in that, The support bracket (5) is made of glass fiber reinforced nylon 66 composite material.

6. The segmented stator according to claim 1, characterized in that, The potting compound is a silicone thermally conductive potting compound.

7. The segmented stator according to claim 1, characterized in that, It also includes a toothed bracket (6), which has an inner shell (61) that can accommodate the rotor (7). The inner shell (61) abuts against the insulating buckle (2). The outer periphery of the inner shell (61) is evenly provided with slots for inserting the U-shaped iron core (1) and fixing teeth (62) for fixing the winding coil (4).

Images