Stator assembly, micro motor and micro water pump

Abstract

The utility model discloses a kind of stator assemblies, including core, retainer and winding, the stator assembly whole adopts ring around type structure;The core adopts U-shaped structure, including U shape outer wall and inner wall and closed end and non-closed end, its outer wall is cambered surface, the inner wall of U-shaped structure far from closed end is the first concave arc surface and second concave arc surface matched with rotor;The retainer is used to cover the core and make the winding wind on it, the retainer is covered in the both sides of the closed end, the opposite inner side in the closed end is equipped with the first opening and the second opening relatively to inwards, the opposite outer side in the closed end is equipped with the first gap and the second gap relatively to outwards, the two sides of the first gap and the second gap are bent with shell;The winding is continuously wound along the circumferential direction of the retainer that covers the core, and forms the magnetic pole of symmetrical distribution.

Description

Technical Field

[0001] This utility model relates to the field of motor stator assembly technology, and in particular to a stator assembly, a miniature motor using the stator assembly, and a miniature water pump using the miniature motor. Background Technology

[0002] Currently available DC brushless water pumps (such as the DC30 / DC40 series) and / or motors generally adopt traditional cylindrical or square stator structures (as shown in the instruction manual). Figure 1 As shown in the diagram, the stator structure is either a single, square core with a large gap between the stator and the housing, and the windings are evenly distributed along the outer periphery of the core. This structure has significant problems: low radial space utilization, meaning the traditional stator structure occupies a complete radial space within the pump and / or motor housing, resulting in redundant overall housing dimensions; existing technologies attempt to reduce size through miniaturized motors, but the stator diameter is difficult to compress. In conventional designs, the stator assembly occupies 30-50% of the pump's radial length, restricting miniaturization applications (such as portable devices); this is especially problematic in miniaturized motors and miniature pumps, where the ineffective space exceeds 30%. Summary of the Invention

[0003] This utility model addresses the shortcomings of existing technologies: a large gap exists between the stator and the housing, resulting in low radial space utilization; the stator diameter is difficult to compress, and the stator assembly occupies 30-50% of the pump body's radial length, hindering miniaturization applications. Therefore, this invention proposes a stator assembly, a miniaturized motor using this stator assembly, and a miniature water pump using this miniaturized motor. The technical solution of this utility model is as follows: The first aspect of this utility model provides a stator assembly, including a core, a cage, and windings, wherein the stator assembly as a whole adopts a surrounding structure; wherein... The iron core adopts a U-shaped structure, which includes an outer wall and an inner wall of the U shape, as well as a closed end and a non-closed end. Its outer wall is a circular arc surface, and the inner wall of the U-shaped structure away from the closed end is a first concave arc surface and a second concave arc surface that cooperate with the rotor. The retainer is used to cover the iron core and wind the winding around it. The retainer covers both sides of the closed end. The closed end has an inwardly facing first opening and a second opening on the opposite inner side. The closed end has an outwardly facing first notch and a second notch on the opposite outer side. The winding is continuously wound around the circumference of the cage covering the iron core to form symmetrically distributed magnetic poles.

[0004] Preferably, the surface of the first opening close to the rotor is a third concave arc surface. The surface of the second opening closest to the rotor is the fourth concave arc surface. The third and fourth concave arc surfaces, together with the first and second concave arc surfaces, form an arc surface that surrounds more than 3 / 4 of the circumference, used for large-area mating with the rotor.

[0005] Preferably, the winding includes a first winding and a second winding. The first winding is wound circumferentially within the first opening and the first notch. The second winding is wound circumferentially within the second opening and the second notch. The first winding and the second winding have the same number of turns but opposite directions, and after winding, the stator assembly has an overall ring structure.

[0006] Preferably, the first notch extends outward from the non-closed end of the U-shaped iron core, and a first wedge-shaped protrusion is provided on one side of the extension for fixing the coil winding end of the first winding. The second notch extends outward from the non-closed end of the U-shaped iron core, and a second wedge-shaped protrusion is provided on one side of the extension for fixing the coil winding end of the second winding. The first wedge-shaped protrusion and the second wedge-shaped protrusion are on the same side.

[0007] Preferably, the first concave arc surface is provided with a first groove. The second concave arc surface is provided with a second groove. The first groove and the second groove are arranged opposite to each other to distribute the magnetic field.

[0008] Preferably, the retainer is located on one side of the arc surface of the outer wall and has a mounting ear extending axially. The mounting ear has a hole and can be fixedly connected to the housing.

[0009] Preferably, the central angle of the non-closed end opening is α, where α = 65°-80°.

[0010] Preferably, the stator assembly further includes a housing (16). The arc surface is a structure in which the outer wall and the shell are matched. The first and second notches bend along the sides of the shell.

[0011] Another aspect of this utility model provides a miniature motor, including a housing and a stator assembly and a rotor disposed within the housing. The stator assembly is the aforementioned stator assembly, which surrounds the outer periphery of the rotor by more than 3 / 4 of its circumference, and the overall structure of the stator assembly is fully fitted to the inner wall of the housing, forming a structure in which the stator assembly tightly surrounds the rotor within the housing, thereby reducing the overall size of the housing by 1 / 3 of its volume.

[0012] In another aspect, this utility model provides a miniature water pump, including a water pump housing and an impeller assembly and a miniature motor disposed inside the water pump housing. The miniature motor is the aforementioned miniature motor. The input end of the impeller assembly is connected to the output end of the miniature motor. The miniature motor can reduce the overall size of the miniature water pump by 1 / 3.

[0013] The beneficial effects of this invention are as follows: The stator assembly of this invention adopts a wraparound structure, which can be well integrated with the rotor structure. Compared with the traditional square stator structure, this structure can greatly reduce space waste and improve space utilization. The outer wall of the iron core adopts an arc surface that matches the shell, allowing the iron core to fit perfectly with the shell. This not only enhances the stability of the stator assembly within the shell but also reduces the gap between them, contributing to a reduction in overall volume. The stator assembly surrounds more than 3 / 4 of the rotor's perimeter, ensuring a strong magnetic coupling between them. The overall structure of the stator assembly perfectly matches the inner wall of the shell, making full use of the space between the stator assembly and the shell, with almost no extra gaps. This tightly wrapped structure can reduce the overall size of the shell by 1 / 3 (the shell of this miniaturized motor can be shared with the shell of the aforementioned stator assembly). The significant reduction in size allows the miniaturized motor to be applied in more space-constrained applications, such as precision instruments and portable devices, broadening the application range of the motor. At the same time, the compact structure also enhances the overall rigidity of the motor and improves its reliability in special environments. This solution fully leverages the advantage of the miniaturized motor's small size; the miniaturized motor provides sufficient power to the impeller assembly while reducing the overall size of the micro pump by one-third. For micro pumps that need to be installed in confined spaces, such as infusion pumps in medical devices and circulation pumps in small aquariums, this miniaturized design makes them more practical. The reduced size also lowers the pump's material and transportation costs, while reducing energy consumption during operation, aligning with the trend of energy conservation and environmental protection. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the stator assembly, rotor, and housing of this utility model.

[0015] Figure 2 This is a three-dimensional structural diagram of the stator assembly of this utility model.

[0016] Figure 3 This is a cross-sectional structural diagram of the stator assembly of this utility model.

[0017] Figure 4 This is a cross-sectional structural diagram of the stator assembly, rotor, and housing of this utility model.

[0018] Figure 5 This is a schematic diagram of the U-shaped iron core of this utility model.

[0019] Figure 6 This is a three-dimensional structural diagram of the miniature water pump of this utility model.

[0020] Figure 7 This is a three-dimensional structural diagram comparing the volume of the stator assembly before and after the improvement of the micro water pump of this utility model.

[0021] Figure 8 This is an exploded three-dimensional structural diagram of the micro water pump of this utility model.

[0022] Figure label: Figures 1-8 In the diagram, 1. Iron core, 2. Cage, 3. First winding, 4. Second winding, 5. First concave arc surface, 6. Second concave arc surface, 7. First opening, 8. Second opening, 9. First notch, 10. Second notch, 11. First wedge-shaped protrusion, 12. Second wedge-shaped protrusion, 13. Mounting lug, 14. Third concave arc surface, 15. Fourth concave arc surface, 16. Housing, 17. Rotor, 19. First groove, 20. Second groove, 21. End cover, 22. Impeller assembly, 23. Miniature water pump, 24. Stator assembly, 25. Outer wall, 26. Inner wall, 27. Closed end, 28. Unclosed end, 29. Conventional stator assembly. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0024] This invention addresses the existing technology where a large gap exists between the stator assembly and the housing of the motor, resulting in low radial space utilization due to the traditional stator assembly 29; the stator diameter is difficult to compress, and the stator assembly occupies 30-50% of the pump body's radial length, hindering miniaturization applications. Therefore, this invention proposes a stator assembly, a miniaturized motor using this stator assembly, and a miniature water pump using this miniaturized motor; the technical solution of this invention is as follows: The first aspect of this utility model provides a stator assembly, such as... Figures 1-5As shown, the stator assembly 24 includes a core 1, a cage 2, and windings, and the entire assembly adopts a wraparound structure. The core 1 has a U-shaped structure, which includes an outer wall 25 and an inner wall 26, as well as a closed end 27 and a non-closed end 28. The outer wall 25 is an arc surface that matches the housing 16 that surrounds the stator assembly 24. The inner wall 26 of the U-shaped structure away from the closed end 27 has a first concave arc surface 5 and a second concave arc surface 6 that cooperate with the rotor 17. The cage 2 is used to cover the core 1 and wind the windings around it. The cage 2 covers both sides of the closed end 27. The relatively inner side of the closed end 27 has an inwardly facing first opening 7 and a second opening 8, and the relatively outer side of the closed end 27 has an outwardly facing first notch 9 and a second notch 10. The sides of the first notch 9 and the second notch 10 bend with the housing 16. The windings are continuously wound around the circumference of the cage 2 that covers the core 1, forming symmetrically distributed magnetic poles.

[0025] Furthermore, such as Figures 1-5The stator assembly 24 shown adopts a wraparound structure, which can be well integrated with the rotor 17 structure. The external structure of the stator assembly 24 can also match the outer housing 16. Compared with the traditional square stator structure, this structure can greatly reduce space waste and improve space utilization. The outer wall 25 of the iron core 1 adopts an arc surface that matches the housing 16, so that the iron core 1 can fit perfectly with the housing 16. This not only enhances the stability of the stator assembly 24 within the housing 16, but also reduces the gap between the two, which helps to reduce the overall volume. The inner wall 26 of the U-shaped structure away from the closed end 27 is provided with a first concave arc surface 5 and a second concave arc surface 6 that cooperate with the rotor 17. This provides a basis for the cooperation between the stator assembly 24 and the rotor 17, ensuring that the rotor 17 maintains a stable relative position with the stator assembly 24 during rotation. Furthermore, the cage 2 features a clever and multifunctional structural design. It covers both sides of the U-shaped closed end 27 of the iron core 1. The first opening 7 and the second opening 8, located on the inner side of the closed end 27 of the iron core 1, face inwards and opposite each other, while the first notch 9 and the second notch 10, located on the outer side, face outwards and opposite each other. Both sides bend along the housing 16. This design not only adapts to the shape of the housing 16 but also creates conditions for the distribution of the windings, allowing the windings to be wound more closely to the structure of the housing 16 and the iron core 1. This provides good protection for the iron core 1 while providing support space for the windings, facilitating the formation of effective magnetic poles. Moreover, the windings are continuously wound circumferentially along the cage 2 covering the iron core 1, forming symmetrically distributed magnetic poles. This winding method allows for a more uniform magnetic field distribution, thereby improving the motor's operational stability and efficiency. The symmetrically distributed magnetic poles make the force exerted by the stator assembly 24 on the rotor 17 more balanced, reducing vibration and noise during motor operation. The iron core 1 is composed of several stamped silicon steel sheets stacked and fixed together, including but not limited to magnetic materials such as ferrite; the winding includes but is not limited to coils wound with enameled wire, and this scheme does not impose any special limitations.

[0026] Preferably, such as Figures 1-5 As shown, the surface of the first opening 7 close to the rotor 17 is the third concave arc surface 14, and the surface of the second opening 8 close to the rotor 17 is the fourth concave arc surface 15. The third concave arc surface 14 and the fourth concave arc surface 15, together with the first concave arc surface 5 and the second concave arc surface 6, form an arc surface that is more than 3 / 4 of the circumference, which is used to fit the rotor 17 over a large area.

[0027] Furthermore, such as Figures 1-5The two concave arc surfaces on the iron core 1 and the two concave arc surfaces on the cage 2 together form an arc surface that surrounds more than 3 / 4 of the circumference. This large-area enclosure structure indicates a larger contact range between the stator assembly 24 and the rotor 17, which significantly enhances the magnetic coupling effect between them. The larger mating area allows for smoother transmission of magnetic flux, reduces magnetic leakage, and improves the energy conversion efficiency of the motor. Simultaneously, the large-area mating also makes the radial force on the rotor 17 more uniform during rotation, reducing the eccentricity of the rotor 17 during operation and helping to extend the service life of the motor. This design is suitable for motors requiring high precision and high stability operation.

[0028] Preferably, such as Figures 1-5 As shown, the winding includes a first winding 3 and a second winding 4. The first winding 3 is wound circumferentially within the first opening 7 and the first notch 9, and the second winding 4 is wound circumferentially within the second opening 8 and the second notch 10. The first winding 3 and the second winding 4 have the same number of turns but opposite winding directions. After winding, the stator assembly 24 has an overall ring structure.

[0029] Furthermore, such as Figures 1-5 The distribution of the first winding 3 and the second winding 4 shown makes full use of the space provided by the openings and notches on the cage 2, making the winding layout more compact and reasonable. The first winding 3 and the second winding 4 have the same number of turns but opposite winding directions, which can form a symmetrical magnetic field. The same number of turns ensures that the magnetic field strength generated by the two windings is basically the same, while the opposite winding directions will cause the magnetic field generated by them to be opposite in direction, thus forming symmetrically distributed magnetic poles on the stator assembly 24. After winding, the stator assembly 24 is structured to surround the rotor 17, which further enhances the integrity and structural compactness of the stator assembly 24, so that the magnetic field can act on the rotor 17 more effectively during the operation of the motor, thereby improving the performance of the motor.

[0030] Preferably, such as Figures 1-5 As shown, the first notch 9 extends outward from the non-closed end 28 of the U-shaped iron core 1, and a first wedge-shaped protrusion 11 is provided on one side of the extension for fixing the winding end of the coil of the first winding 3; the second notch 10 extends outward from the non-closed end 28 of the U-shaped iron core 1, and a second wedge-shaped protrusion 12 is provided on one side of the extension for fixing the winding end of the coil of the second winding 4; the first wedge-shaped protrusion 11 and the second wedge-shaped protrusion 12 are on the same side.

[0031] Furthermore, such as Figures 1-5As shown, the wedge-shaped structure has good self-locking performance, which can firmly fix the winding ends and prevent the ends from loosening due to vibration or other reasons during motor operation. The first wedge-shaped protrusion 11 and the second wedge-shaped protrusion 12 are on the same side, which facilitates the installation and wiring of the winding, makes it easier for workers to handle the winding ends during assembly, improves assembly efficiency, and is also beneficial for later maintenance and repair.

[0032] Preferably, such as Figure 5 As shown, a first groove 19 is provided in the first concave arc surface 5, and a second groove 20 is provided in the second concave arc surface 6. The first groove 19 and the second groove 20 are arranged opposite to each other to distribute the magnetic field.

[0033] Furthermore, such as Figures 1-5 As shown, the presence of the groove alters the magnetic circuit path inside the iron core 1. When the magnetic field passes through the iron core 1, the groove affects the distribution of magnetic field lines. The density of the magnetic circuit can be adjusted according to actual needs to optimize the magnetic field distribution. A reasonable magnetic field distribution can improve the magnetic permeability of the iron core 1, reduce hysteresis loss and eddy current loss, thereby improving the overall efficiency of the motor. In addition, the groove can increase the heat dissipation area of ​​the iron core 1, which helps the iron core 1 dissipate heat during motor operation and avoids the impact of excessive temperature on motor performance.

[0034] Preferably, such as Figures 1-5 As shown, the retainer 2 is located on one side of the arc surface of the outer wall 25 and is provided with a mounting ear 13 extending along the axial direction. The mounting ear 13 has a hole and can be fixedly connected to the housing 16.

[0035] Furthermore, such as Figures 1-5 As shown, the mounting ear 13 can be a plate structure, with the same curvature as the arc surface, allowing the mounting ear 13 to perfectly fit the inner wall of the housing 16, ensuring a tight connection. The holes in the mounting ear 13 can be fixedly connected to the housing 16 and / or the base and / or the end cover 21. This connection method is simple and reliable, firmly fixing the stator assembly 24 within the housing 16, preventing displacement of the stator assembly 24 during motor operation, and reducing assembly complexity. Provided the connection strength is guaranteed, the connection holes in the mounting ear 13 are not limited to through holes; they can also be threaded holes or U-shaped holes, etc., without specific limitations here.

[0036] Preferably, such as Figure 3 As shown, the central angle of the open end 28 is α, where α = 65° - 80°.

[0037] Furthermore, such as Figure 3As shown, the central angle of the opening is set to 65°-80°, a range determined through extensive practice and optimization. If the central angle is too small, it will make rotor 17 difficult to install and may limit its rotation range; if the central angle is too large, it will reduce the mating area between the stator assembly 24 and the rotor 17, affecting the magnetic coupling effect. The 65°-80° central angle ensures that the stator assembly 24 has sufficient surrounding mating area with the rotor 17 while reserving ample space for the installation and rotation of the rotor 17, enabling the rotor 17 to operate flexibly and stably, balancing motor performance and assembly convenience.

[0038] The second aspect of this utility model provides a miniature motor, including a housing and a stator assembly 24 and a rotor 17 disposed within the housing. The stator assembly 24 is the aforementioned stator assembly 24, which surrounds the outer periphery of the rotor 17 by more than 3 / 4 of its circumference, and the overall structure of the stator assembly 24 is fully fitted to the inner wall of the housing 16, forming a structure in which the stator assembly 24 tightly surrounds the rotor 17 within the housing 16, thereby reducing the overall size of the housing 16 by 1 / 3 of its volume.

[0039] Furthermore, such as Figure 8 As shown, the stator assembly 24 can have its own stator assembly housing or share the same housing with the miniature motor, depending on the operating conditions (in this embodiment, it shares the same housing with the miniature motor). The stator assembly 24 surrounds more than 3 / 4 of the rotor 17, ensuring a strong magnetic coupling between the two. The overall structure of the stator assembly 24 perfectly fits the inner wall of the housing 16, making full use of the space between the stator assembly 24 and the housing 16 with almost no extra gaps. This tightly wrapped structure reduces the overall size of the housing 16 by 1 / 3. This significant reduction in size allows the miniature motor to be used in more applications with special space requirements, such as precision instruments and portable devices, broadening the application range of the motor. At the same time, the compact structure also enhances the overall rigidity of the motor and improves its reliability in special environments.

[0040] The third aspect of this utility model is as follows: Figures 6-8 As shown, a miniature water pump 23 is provided, including a water pump housing and an impeller assembly 22 and a miniature motor disposed inside the water pump housing. The miniature motor is the aforementioned miniature motor. The input end of the impeller assembly 22 is connected to the output end of the miniature motor. The miniature motor can reduce the overall size of the miniature water pump 23 by 1 / 3.

[0041] Furthermore, such as Figures 6-8As shown, this solution fully utilizes the advantage of the miniaturized motor's small size; the miniaturized motor can provide sufficient power to the impeller assembly 22, while reducing the overall size of the miniature water pump 23 by 1 / 3. For miniature water pumps 23 that need to be installed in confined spaces, such as infusion pumps in medical devices and circulation pumps in small aquariums, this miniaturized design makes them more practical. The reduction in size also reduces the material and transportation costs of the water pump, while reducing energy consumption during operation, which aligns with the trend of energy conservation and environmental protection.

[0042] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A stator assembly comprising a core (1), a cage (2), and windings, characterized in that, The stator assembly (24) adopts a wraparound structure as a whole; wherein, The iron core (1) adopts a U-shaped structure, which includes an outer wall (25) and an inner wall (26) of the U shape, as well as a closed end (27) and a non-closed end (28). Its outer wall (25) is an arc surface, and the inner wall (26) of the U-shaped structure away from the closed end (27) is a first concave arc surface (5) and a second concave arc surface (6) that cooperate with the rotor (17). The retainer (2) is used to cover the iron core (1) and to wind the winding around it. The retainer (2) covers both sides of the closed end (27). A first opening (7) and a second opening (8) facing inward are provided on the relatively inner side of the closed end (27). A first notch (9) and a second notch (10) facing outward are provided on the relatively outer side of the closed end (27). The winding is continuously wound around the circumference of the cage (2) covering the iron core (1) to form symmetrically distributed magnetic poles.

2. The stator assembly according to claim 1, characterized in that, The surface of the first opening (7) that is close to the rotor (17) is the third concave arc surface (14). The surface of the second opening (8) that is close to the rotor (17) is the fourth concave arc surface (15). The third concave arc surface (14) and the fourth concave arc surface (15) together with the first concave arc surface (5) and the second concave arc surface (6) form an arc surface that is more than 3 / 4 of the circumference, which is used to fit the rotor (17) over a large area.

3. The stator assembly according to claim 2, characterized in that, The windings include a first winding (3) and a second winding (4). The first winding (3) is wound circumferentially within the first opening (7) and the first notch (9). The second winding (4) is wound circumferentially within the second opening (8) and the second notch (10). The first winding (3) and the second winding (4) have the same number of turns and opposite winding directions. After winding, the stator assembly (24) is in a ring-shaped structure.

4. The stator assembly according to claim 2, characterized in that, The first notch (9) extends outward from the non-closed end (28) of the U-shaped iron core (1), and a first wedge-shaped protrusion (11) is provided on one side of the extension for fixing the coil winding end of the first winding (3); The second notch (10) extends outward from the non-closed end (28) of the U-shaped iron core (1), and a second wedge-shaped protrusion (12) is provided on one side of the extension for fixing the coil winding end of the second winding (4); The first wedge-shaped protrusion (11) and the second wedge-shaped protrusion (12) are on the same side.

5. The stator assembly according to claim 1, characterized in that, The first concave arc surface (5) is provided with a first groove (19). The second concave arc surface (6) is provided with a second groove (20). The first groove (19) is arranged opposite to the second groove (20) for distributing the magnetic field.

6. The stator assembly according to claim 1, characterized in that, The retainer (2) has an axially extending mounting ear (13) on one side of the arc surface of the outer wall (25). The mounting ear (13) has a hole and can be fixedly connected to the housing (16).

7. The stator assembly according to claim 1, characterized in that, The central angle of the opening of the non-closed end (28) is a, where a = 65°-80°.

8. The stator assembly according to claim 1, characterized in that, It also includes the housing (16). The arc surface is a structure in which the outer wall (25) and the shell (16) match each other. The first notch (9) and the second notch (10) bend along the shell (16).

9. A miniature motor, characterized in that, The device includes a housing (16) and a stator assembly (24) and a rotor (17) disposed within the housing (16). The stator assembly (24) is the stator assembly (24) according to any one of claims 1-8. The stator assembly (24) surrounds the outer periphery of the rotor (17) by more than 3 / 4 of its circumference, and the overall structure of the stator assembly (24) is fully fitted to the inner wall of the housing (16), forming a structure in which the stator assembly (24) tightly surrounds the rotor (17) within the housing (16), thereby reducing the overall size of the housing (16) by 1 / 3 of its volume.

10. A miniature water pump, characterized in that, The pump includes a water pump housing and an impeller assembly (22) and a miniature motor disposed inside the water pump housing. The miniature motor is the miniature motor as described in claim 9. The input end of the impeller assembly (22) is connected to the output end of the miniature motor. The miniature motor can reduce the overall size of the miniature water pump (23) by 1 / 3.

Images