Axial flux plastic encapsulated motor, manufacturing method and extractor hood

Abstract

The application discloses an axial flux plastic package motor, a manufacturing method and an extractor hood. The axial flux plastic package motor comprises a rotor assembly and a stator assembly which are stacked along an axial direction. The rotor assembly comprises a rotating shaft, a magnetic steel fixing plate and magnetic steels. The stator assembly comprises a stator core, a coil and a plastic package shell. The stator core has a stator yoke and stator teeth which protrude along the axial direction. The coil is wound on the stator teeth. The plastic package shell wraps and fixes the stator core and the coil. An opening is arranged at the top of the plastic package shell so that the top end surface of the stator teeth is exposed to form an axial air gap with the magnetic steels. The magnetic flux directly passes through the air gap along the axial direction through the axial flux structure, effectively shortens the magnetic circuit and realizes the flattening of the motor. Meanwhile, the plastic package shell provides excellent waterproof and oil-proof sealing and noise reduction and shock absorption effects. The manufacturing method of the application is realized through the injection molding of the stator semi-product and the assembly molding step. The application is suitable for the extractor hood and can reduce the axial space occupied by the extractor hood, which is beneficial to the lightweight and compact design of the whole machine.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to an axial flux-encapsulated motor, its manufacturing method, and a range hood. Background Technology

[0002] Traditional household range hoods typically use radial flux brushless DC motors as their power source. These motors are slender cylindrical with the stator core nested around the rotor. Their magnetic lines of force pass through the air gap along a radial path perpendicular to the shaft. To obtain greater output torque, the axial length of the motor is often increased (i.e., the overall motor length is increased), and the stator core requires a thick yoke to guide the magnetic circuit closure. This results in a large overall motor size, long axial length, and heavy weight.

[0003] However, as modern kitchen appliances trend towards ultra-thin, flat, and built-in designs, the space available for motor installation within the duct system and fan housing of range hoods is extremely limited, especially in the axial direction (front-to-back). This makes it difficult to directly install traditional slender cylindrical radial motors. Due to their slender cylindrical structure, traditional radial motors are typically installed behind or above the fan housing. This not only occupies a significant amount of duct space and limits the diameter of the centrifugal impeller, thus affecting suction power, but also makes it difficult to reduce the overall thickness of the range hood, restricting the overall structural design and appearance of the range hood.

[0004] Furthermore, traditional radial motors often employ metal casings or simple end cap structures. When used inside range hoods in high-humidity, high-oil environments, the gaps in the metal casing easily allow oil and moisture to seep in, leading to short circuits in the internal stator windings due to moisture, or jamming of the motor bearings due to oil buildup, severely shortening the motor's lifespan. Simultaneously, when traditional metal-cased motors are installed with a volute housing, insufficient vibration damping can easily generate high-frequency vibrations and noise, affecting the user experience. If a combination of an iron core and a metal casing is used, the motor's weight is also relatively heavy, increasing the overall load on the range hood. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems existing in the prior art and to provide an axial flux encapsulated motor that can achieve an ultra-thin and flat structure, with excellent oil and water resistance and low noise characteristics. At the same time, this invention also proposes a range hood that includes the above-mentioned axial flux encapsulated motor.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An axial flux-encapsulated motor includes: a rotor assembly and a stator assembly;

[0008] The rotor assembly includes a rotating shaft, a magnet fixing plate, and several magnets. The magnet fixing plate is fixed on the rotating shaft, and each magnet is disposed on the end face of the magnet fixing plate.

[0009] The stator assembly includes a stator core, several coils, and a plastic encapsulation shell. The stator core includes a stator yoke and several stator teeth protruding axially along the shaft. The stator teeth are spaced circumferentially, and the width of each stator tooth gradually increases from the inside to the outside along the radial direction of the stator core. Each coil is wound around a corresponding stator tooth. The plastic encapsulation shell wraps and fixes the stator core and each coil. The top of the plastic encapsulation shell has an opening so that the top surface of each stator tooth is exposed at the opening. The exposed top surface of each stator tooth forms an air gap working surface opposite to the magnet, and an axial air gap is left between the air gap working surface and the magnet.

[0010] By adopting the above technical solution, because the stator teeth protrude along the axial direction of the shaft and have a fan-shaped structure that is narrower inside and wider outside, the magnetic lines of force originate from the top surface of the stator teeth, pass directly through the axial air gap, and enter the magnet, thus shortening the magnetic circuit length. In this magnetic circuit, the magnetic lines of force do not need to make large-angle detours along the periphery of the stator core, thereby reducing the cross-sectional area and thickness of the stator yoke. This results in the stator assembly having an overall flat disc shape, effectively reducing the axial dimension of the motor.

[0011] Meanwhile, by encasing and securing the stator core and coils in a plastic shell, not only is insulation provided, but the stator core and coils are also effectively sealed, preventing external moisture and oil from entering the motor and extending the motor's lifespan in harsh environments such as range hoods.

[0012] Furthermore, the magnets are fan-shaped, and the top surfaces of the stator teeth are also fan-shaped, with the magnets and stator teeth positioned opposite each other along the motor's axial direction. This structure creates a positively aligned axial air gap between the magnetic poles of the fan-shaped magnets and the fan-shaped stator teeth, effectively increasing the effective working area at the axial air gap and thus improving the motor's torque density.

[0013] Furthermore, the stator assembly also includes a winding bobbin, which is respectively fitted onto each stator tooth, and each coil is wound on the corresponding winding bobbin. By setting the winding bobbin, good electrical isolation is achieved between the coil and the stator tooth, preventing damage to the coil insulation layer during winding.

[0014] Furthermore, the winding frame includes a winding cylinder and limiting protrusions respectively disposed at both ends of the winding cylinder. The coil is wound on the winding cylinder and is confined between the limiting protrusions at both ends. By clamping the coil onto the winding cylinder through the limiting protrusions at both ends, axial loosening or displacement of the coil can be effectively prevented during winding or subsequent molding.

[0015] Furthermore, the winding plane of the coil on the winding frame is perpendicular to the axial direction of the shaft, and the axis of the coil is parallel to the axis of the shaft. This winding arrangement, combined with the axial protrusion structure of the stator teeth, allows the coil to be compactly accommodated between the stator teeth, further reducing the overall radial volume of the stator.

[0016] Furthermore, the stator teeth are provided with fitting grooves on their sides, and the end edge of the plastic-encapsulated housing is fitted into the fitting grooves to fix the plastic-encapsulated housing to the stator core. Through the interlocking fit between the fitting grooves and the edge of the plastic-encapsulated housing, after injection molding, the plastic-encapsulated housing can be firmly engaged with the stator teeth, which greatly enhances the pull-out resistance of the plastic-encapsulated housing and further prevents oil from seeping into the interior from the joint gap between the housing and the core.

[0017] Furthermore, the outer periphery of the plastic-encapsulated housing is provided with several mounting lugs, and the mounting lugs are provided with mounting holes. Through the mounting holes, the axial flux encapsulated motor can be mounted on the mounting bracket on the side wall of the range hood volute using fasteners, thereby simplifying the positioning and installation process of the motor.

[0018] Furthermore, it also includes a front cover and a rear cover, which are respectively placed on both axial ends of the plastic-encapsulated housing and together with the plastic-encapsulated housing to form a receiving cavity, in which the rotor assembly and stator assembly are located. Through the cooperation of the front and rear cover and the plastic-encapsulated housing, a fully enclosed cavity is formed that surrounds the rotor and stator, making the motor more complete and compact as a whole.

[0019] Furthermore, the front end cover and / or rear end cover are equipped with bearings for supporting the rotating shaft, which passes through the bearings. By directly supporting the bearings with the end covers, the internal structure is simplified, and the concentricity and stability of the rotating shaft during operation are improved.

[0020] Furthermore, the magnets are fixedly attached to the end face of the magnet fixing plate, and a gap is provided between adjacent magnets. The gap between adjacent magnets helps to avoid short circuits in the magnetic circuit, ensuring that the magnetic flux can be more concentrated and act on the stator teeth through the air gap, thereby maintaining a high torque output capability.

[0021] A method for manufacturing an axial flux-encapsulated motor, characterized by comprising the following steps:

[0022] Step 1: Place the winding bobbins onto each stator tooth of the stator core, and wind the coils onto the corresponding winding bobbins to form a semi-finished stator.

[0023] Step 2: After heating the stator semi-finished product obtained in Step 1, place it into an injection mold, inject molding material into the injection mold, and perform injection molding to obtain a stator assembly with a molding shell.

[0024] Step 3: Assemble the rotor assembly;

[0025] Step 4: Stack the stator assembly with plastic-encapsulated shell obtained in Step 2 and the rotor assembly obtained in Step 3 along the axial direction to complete the manufacturing of the axial flux plastic-encapsulated motor.

[0026] Furthermore, in step two, the stator semi-finished product obtained in step one is placed into a stator heating machine and heated to a preheating temperature of 160℃~200℃.

[0027] Furthermore, in step two, the mold temperature of the injection mold is 115℃~135℃, and the molding compound is DMC resin.

[0028] Furthermore, the present invention also provides a range hood including the aforementioned axial flux-encapsulated motor. When applied to a range hood, the aforementioned axial flux-encapsulated motor effectively utilizes its flattened characteristics, occupying less installation space behind the volute, thereby reducing the overall weight of the range hood and providing favorable conditions for its compact front-to-back layout.

[0029] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0030] 1. This invention features stator teeth that bulge axially along the shaft and have a fan-shaped structure that is narrower on the inside and wider on the outside. This allows magnetic lines of force to originate from the top surface of the stator teeth and directly pass through the axial air gap into the magnet. In this process, the magnetic lines of force do not need to make large-angle detours along the periphery of the stator core as in traditional radial motors, thus effectively reducing the cross-sectional area and thickness of the stator yoke. This not only makes the stator assembly as a whole flat disc, reducing the axial dimensions of the motor and providing hardware support for the ultra-thin and compact design of equipment such as range hoods, but also increases the effective area of ​​the air gap working surface, making the distribution of magnetic lines of force more uniform. Actual testing has verified that, under the same volume and weight conditions, the output torque of this invention can be increased by 30% to 80% compared to traditional radial motors, and it also exhibits extremely strong low-speed starting torque and excellent direct-drive performance.

[0031] 2. This invention uses injection molding to integrally mold the plastic-encapsulated shell, stator core, and coils. On one hand, the dense plastic layer forms a seamless insulating and sealing barrier on the outside of the stator assembly, effectively isolating the high concentration of oil fumes, moisture, and dust inside the range hood. This prevents traditional motors from experiencing winding short circuits or bearing jamming due to oil seeping into the metal shell, thus improving the motor's lifespan and reliability in harsh kitchen environments. On the other hand, the plastic material tightly fills the space between the coils and the stator core, eliminating the micro-fluids generated by traditional loose windings during air gap vibration. This provides excellent damping and vibration reduction, effectively reducing high-frequency vibration and electromagnetic noise during motor operation, and improving the user experience.

[0032] 3. This invention employs an axial flux design, resulting in a shorter magnetic circuit and eliminating the need for the heavy yoke used in traditional motors for large-angle magnetic circuit detours. This significantly reduces the weight and volume of the stator core. Due to the greatly shortened magnetic circuit length, the hysteresis and eddy current losses of the stator core are significantly reduced. Testing shows that the peak efficiency of the motor based on this invention can reach over 97% over a wide speed range, with a broad high-efficiency range. Simultaneously, the reduction in the overall weight of the stator assembly effectively lowers the overall load, providing favorable conditions for the lightweight design of range hoods.

[0033] 4. This invention features an interlocking groove on the side of the stator teeth, into which the end edge of the plastic-encapsulated housing is embedded during injection molding. This physical interlocking structure not only significantly improves the tensile strength between the plastic-encapsulated housing and the stator core, ensuring that the housing and core will not loosen under long-term vibration conditions, but also seals the joint gap between the plastic-encapsulated housing and the stator core, forming an oil- and water-resistant barrier, further preventing capillary leakage of oil fumes along the gaps and ensuring internal electrical safety. Attached Figure Description

[0034] The present invention will be further described below with reference to the accompanying drawings:

[0035] Figure 1 A three-dimensional view of an axial flux-encapsulated motor;

[0036] Figure 2 for Figure 1 Top view;

[0037] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0038] Figure 4 for Figure 1 A bottom view;

[0039] Figure 5 This is a schematic diagram of the structure without a plastic-sealed outer casing;

[0040] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0041] Figure 7 This is a schematic diagram of the rotor assembly.

[0042] Figure 8 This is a schematic diagram of the stator core structure;

[0043] Figure 9 for Figure 8 Enlarged structural diagram at point C;

[0044] Figure 10 A schematic diagram of the connection between the stator core and the coil;

[0045] Figure 11 This is a schematic diagram of the winding skeleton.

[0046] Figure 12 This is a schematic diagram of the coil structure;

[0047] Figure 13 A schematic diagram of the connection between the magnet and the magnet fixing plate;

[0048] Figure 14 This is a schematic diagram of the structure without a front cover.

[0049] Figure 15 A schematic diagram of an axial flux encapsulated motor mounted on the volute of a range hood;

[0050] Figure 16 A schematic diagram of the structure connecting the rotating shaft to the centrifugal impeller;

[0051] Figure 17 This is a schematic diagram of the volute structure;

[0052] Figure 18 This is a flowchart illustrating the manufacturing method of an axial flux-encapsulated motor.

[0053] In the diagram, 1-rotor assembly; 11-shaft; 12-magnet mounting plate; 13-magnet;

[0054] 2-Stator assembly; 21-Stator core; 211-Stator yoke; 212-Stator tooth; 213-Root arc transition surface; 214-Winding slot; 2121-Matching slot; 2122-Stator tooth top surface; 22-Coil; 23-Winding bobbin; 231-Winding column; 232-Limiting protrusion; 233-Connecting arc transition surface; 234-Edge arc transition surface; 24-Plastic encapsulation shell; 241-Mounting lug; 242-Mounting hole; 243-Opening;

[0055] 3-Front end cap;

[0056] 4- Rear end cover;

[0057] 5-Bearings;

[0058] 6-Volume; 61-Mounting bracket; 62-Centrifugal impeller; 63-Slot;

[0059] a-Axial air gap;

[0060] D - Coil axis. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0062] Example 1

[0063] like Figures 1 to 14 As shown, the present invention provides an axial flux-encapsulated motor, which is generally in the shape of a flat disc and mainly includes a rotor assembly 1 and a stator assembly 2. The rotor assembly 1 and the stator assembly 2 are stacked axially, with an axial air gap a between them.

[0064] The rotor assembly 1 includes a rotating shaft 11, a magnet fixing plate 12, and a plurality of magnets 13. The magnet fixing plate 12 is disc-shaped and is fixedly sleeved on the rotating shaft 11. The plurality of magnets 13 are evenly arranged circumferentially on the lower end face of the magnet fixing plate 12, with a gap between adjacent magnets 13 (e.g., ...). Figure 13 (as shown) to avoid short circuits in the magnetic circuit and ensure that the magnetic flux can be more concentrated through the air gap and act on the stator teeth 212.

[0065] like Figure 5 , Figures 8 to 10 As shown, the stator assembly 2 includes a stator core 21, several coils 22, a winding frame 23, and a plastic-encapsulated housing 24. The stator core 21 includes an annular stator yoke 211 and 12 stator teeth 212 protruding upward from the upper surface of the stator yoke 211 along the axial direction of the shaft 11. The stator yoke 211 and each stator tooth 212 are integrally formed, which ensures the dimensional accuracy between each stator tooth 212, guarantees the accuracy of the magnetic circuit, and reduces operating vibration. The stator teeth 212 are evenly distributed circumferentially, thereby ensuring the dynamic balance and magnetic pull balance of the stator core 21 during operation. A winding groove 214 is formed between two adjacent stator teeth 212, which is circumferentially continuous, facilitating automated winding. To ensure a good fit with the fan-shaped magnet 13, the width of each stator tooth 212 gradually increases from the inside to the outside along the radial direction of the stator core 21, thus making the top surface 2122 of the stator tooth 212 fan-shaped (e.g., ...). Figure 8 and Figure 9 (As shown). A root arc transition surface 213 is provided between the root of each stator tooth 212 and the stator yoke 211. This root arc transition surface 213 is beneficial to eliminate stress concentration during stamping or injection molding, thereby improving the manufacturing yield of the stator core.

[0066] like Figure 10 and Figure 11As shown, each stator tooth 212 is fitted with a winding bobbin 23. The winding bobbin 23 has an axially penetrating hole to fit the winding bobbin 23 onto the stator tooth 212. The winding bobbin 23 includes a winding cylinder 231 and limiting protrusions 232 respectively disposed at the upper and lower ends of the winding cylinder 231. The coil 22 is wound on the corresponding winding cylinder 231 and is axially limited between the upper and lower limiting protrusions 232 (e.g., ...). Figure 10 As shown in the diagram, this effectively prevents the coil from axially loosening or shifting during winding or subsequent molding. A connecting arc transition surface 233 is provided between the winding cylinder 231 and the limiting protrusion 232 to avoid stress concentration at this connection point, which could damage the winding skeleton and prevent friction damage between the copper wire and the skeleton edge during winding. Furthermore, an edge arc transition surface 234 is provided at the outer edge of the winding cylinder 231 to eliminate the sharp edges of the outer wall of the winding cylinder and prevent the coil insulation layer from being scratched by the edges during winding. Figure 12 As shown, the winding plane of the coil 22 on the winding frame 23 is perpendicular to the axial direction of the rotating shaft 11, and the coil axis D is parallel to the axis of the rotating shaft 11. This winding arrangement allows the coil 22 to be compactly accommodated between adjacent stator teeth 212, reducing the overall volume of the stator.

[0067] like Figure 5 and Figure 9 As shown, the stator teeth 212 have fitting grooves 2121 on both sides. These fitting grooves 2121 are axially connected along the sides of the stator teeth 212. The fitting grooves 2121 have a structure that is wider at the outside and narrower at the inside, meaning the width of the groove opening is greater than the width of the groove bottom. In this embodiment, the cross-section of the fitting groove 2121 is triangular. For example... Figure 3 and Figure 14 As shown, the stator assembly 2 uses an injection-molded plastic casing 24, which tightly wraps and fixes the stator core 21, winding frame 23, and coil 22. During the injection molding process, the end edges of the plastic casing 24 are embedded and solidified in the fitting groove 2121. This chamfered structure not only plays a good guiding role, allowing the plastic material to flow smoothly into and fill the fitting groove, but also forms a good mechanical interlock after the injection material solidifies. This improves the tensile strength between the plastic casing 24 and the stator core 21, ensuring that the motor will not loosen under long-term vibration conditions. At the same time, it seals the joint gaps, forming an oil-proof and water-proof barrier.

[0068] like Figure 14As shown, the top of the plastic-encapsulated housing 24 has an opening 243, exposing the top surface 2122 of each stator tooth 212 at the opening 243. The exposed top surface 2122 of the stator tooth 212 forms an air gap working surface opposite to the magnet 13, with an axial air gap a between the air gap working surface and the magnet 13. Magnetic lines of force originate from the top surface 2122 of the stator tooth, pass directly through the axial air gap a along the axial direction, and enter the magnet 13, effectively shortening the magnetic circuit length. Furthermore, since the large-angle detour of a traditional radial motor is not required, the thickness of the stator yoke 211 is reduced, making the stator assembly as a whole flat disc.

[0069] like Figure 1 and Figure 14 As shown, the outer periphery of the plastic-encapsulated housing 24 is provided with several outwardly extending mounting lugs 241, and each mounting lug 241 has a mounting hole 242. Figure 15 As shown, the axial flux encapsulated motor can be directly fixed to the mounting bracket 61 on the side wall of the volute 6 of the range hood by means of mounting lug 241 and fasteners, without the need for an additional transition bracket, which simplifies the positioning and installation process.

[0070] like Figure 1 , Figure 3 and Figure 4 As shown, the present invention also includes a front cover 3 and a rear cover 4. The front cover 3 and the rear cover 4 are respectively installed on the upper and lower axial ends of the plastic-encapsulated housing 24, forming a closed receiving cavity together with the plastic-encapsulated housing 24, which houses the rotor assembly 1 and the stator assembly 2. In addition, the front cover 3 and / or the rear cover 4 are provided with bearings 5 ​​for supporting the rotating shaft 11, and the rotating shaft 11 passes through the bearings 5, realizing the smooth rotation of the motor.

[0071] Example 2

[0072] like Figure 18 As shown, this embodiment provides a method for manufacturing an axial flux encapsulated motor. In this embodiment, the specific structures of the stator core 21, stator teeth 212, magnet 13, winding frame 23, coil 22, encapsulated shell 24, front cover 3, and rear cover 4 are the same as in Embodiment 1, and will not be described again here.

[0073] Step 1: Assemble the stator semi-finished product: Place the winding frame 23 onto each stator tooth 212 and wind the coil 22 onto the corresponding winding frame 23 to obtain the stator semi-finished product.

[0074] Step 2: Injection molding of the stator semi-finished product: Place the above stator semi-finished product into the stator heating machine and heat it to a preheating temperature of 160℃~200℃; at the same time, heat the upper and lower molds of the injection mold to a mold temperature of 115℃~135℃.

[0075] After the injection mold enters the constant temperature working state, use a spot thermometer to measure the temperature of the four corner points of the inner mold of the injection mold, and ensure that the temperature error of the four corner points of the inner mold of the injection mold is within 10℃.

[0076] The preheated stator semi-finished product is placed into an injection mold, and a molding compound, preferably DMC resin, is injected for injection molding. The molding compound wraps and fixes the stator core 21, the winding frame 23 and the coil 22. After demolding, the stator assembly 2 with the molding compound shell 24 is obtained.

[0077] Step 3: Assemble the rotor assembly: Fix the magnet fixing plate 12 onto the rotating shaft 11, and attach the magnet 13 to the end face of the magnet fixing plate 12 to obtain the rotor assembly 1.

[0078] Step 4: Assemble the motor as a whole: Stack the stator assembly 2 with the plastic-sealed shell 24 and the rotor assembly 1 axially, leaving an axial air gap a between the top surface 2122 of the stator teeth 212 and the magnet 13, and install the front cover 3 and the rear cover 4 to complete the assembly of the axial flux plastic-sealed motor.

[0079] Example 3

[0080] like Figures 15 to 17 As shown, this embodiment provides a range hood, including the axial flux encapsulated motor of Embodiment 1. The range hood has an internal volute 6, with a mounting bracket 61 and a slot 63 on its side wall. The mounting lugs 241 on the outer periphery of the motor's encapsulated housing 24 are fixed to the mounting bracket 61 by screws or other fasteners. The shaft 11 of the axial flux encapsulated motor passes through the slot 63 of the volute 6 and extends into the volute, drivingly connecting with the internal centrifugal impeller 62. Because this axial flux encapsulated motor uses an encapsulated structure and is generally flat and disc-shaped, it occupies very little space in the axial direction (i.e., the front-to-back direction) of the volute 6, providing favorable conditions for a thinner and more compact overall layout of the range hood.

[0081] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. An axial flux-encapsulated motor, comprising: a rotor assembly and a stator assembly; Its features are: The rotor assembly includes a rotating shaft, a magnet fixing plate, and a plurality of magnets. The magnet fixing plate is fixed to the rotating shaft, and each of the magnets is disposed on the end face of the magnet fixing plate. The stator assembly includes a stator core, several coils, and a plastic-encapsulated housing; The stator core includes a stator yoke and a plurality of stator teeth protruding along the axial direction of the rotating shaft. The stator teeth are distributed circumferentially, and the width of each stator tooth gradually increases from the inside to the outside along the radial direction of the stator core. Each coil is wound on the corresponding stator tooth. The plastic encapsulation shell wraps and fixes the stator core and each of the coils, and the top of the plastic encapsulation shell is provided with an opening so that the top surface of each stator tooth is exposed at the opening. The exposed top surface of each stator tooth forms an air gap working surface opposite to the magnet, and an axial air gap is left between the air gap working surface and the magnet.

2. The axial flux-encapsulated motor according to claim 1, characterized in that: The magnet is fan-shaped, the top surface of the stator tooth is fan-shaped, and the magnet and the top surface of the stator tooth are arranged opposite each other along the axial direction of the motor.

3. An axial flux-encapsulated motor according to claim 1, characterized in that: The stator assembly further includes a winding frame, which is respectively sleeved on each of the stator teeth, and each of the coils is wound on the corresponding winding frame.

4. An axial flux-encapsulated motor according to claim 3, characterized in that: The winding frame includes a winding column and limiting protrusions respectively disposed at both ends of the winding column. Each coil is wound on the winding column and is limited between the limiting protrusions at both ends.

5. An axial flux-encapsulated motor according to claim 3, characterized in that: The winding plane of each coil on the winding frame is perpendicular to the axial direction of the rotating shaft, and the axis of the coil is parallel to the axis of the rotating shaft.

6. An axial flux-encapsulated motor according to claim 1, characterized in that: The stator teeth are provided with fitting grooves on their sides, and the end edge of the plastic-encapsulated shell is fitted into the fitting grooves to fix the plastic-encapsulated shell to the stator core.

7. An axial flux-encapsulated motor according to claim 1, characterized in that: The outer periphery of the plastic-encapsulated shell is provided with several mounting lugs, and the mounting lugs are provided with mounting holes.

8. An axial flux-encapsulated motor according to claim 1, characterized in that: It also includes a front cover and a rear cover, which are respectively installed on the axial ends of the plastic-encapsulated housing and together with the plastic-encapsulated housing to form a receiving cavity, in which the rotor assembly and the stator assembly are located.

9. An axial flux-encapsulated motor according to claim 8, characterized in that: The front end cover and / or the rear end cover are provided with bearings for supporting the rotating shaft, and the rotating shaft passes through the bearings.

10. An axial flux-encapsulated motor according to claim 1, characterized in that: The magnet is attached and fixed to the end face of the magnet fixing plate, and there is a gap between two adjacent magnets.

11. A method for manufacturing an axial flux-encapsulated motor as described in any one of claims 1 to 10, characterized in that, Includes the following steps: Step 1: Place the winding frame onto each stator tooth of the stator core as described in claim 1, and wind the coil onto the corresponding winding frame to form a stator semi-finished product; Step 2: After heating the stator semi-finished product obtained in Step 1, place it into an injection mold, inject molding material into the injection mold, and perform injection molding to obtain a stator assembly with a molding shell. Step 3: Assemble the rotor assembly; Step 4: Stack the stator assembly with plastic-encapsulated shell obtained in Step 2 and the rotor assembly obtained in Step 3 along the axial direction to complete the manufacturing of the axial flux plastic-encapsulated motor.

12. A method for manufacturing an axial flux-encapsulated motor according to claim 11, characterized in that: In step two, the stator semi-finished product obtained in step one is placed into a stator heating machine and heated to a preheating temperature of 160℃~200℃.

13. A method for manufacturing an axial flux-encapsulated motor according to claim 11, characterized in that: In step two, the mold temperature of the injection mold is 115℃~135℃, and the molding compound is DMC resin.

14. A range hood, characterized in that, The axial flux-encapsulated motor includes any one of claims 1 to 10.

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