Method of manufacturing a magnetic component housing for an external rotor motor, housing assembly and airflow generator

Abstract

The present application belongs to the technical field of outer-rotor motor, and relates to a manufacturing method of a magnetic component shell of an outer-rotor motor, which comprises a die casting process and a machining process. The body of metal material is die cast in a die casting machine. The body comprises a first end and a second end. A shell cavity is formed in the body. The first end communicates with the shell cavity to form an open end of the body. A shaft hole is formed in the center of the second end. A clamping portion is formed on the outer portion of the second end. A flange is formed on the outer surface of the body at a position with a preset distance from the first end. The clamping portion is clamped by a rotating clamp jaw on a machining device. The outer diameter of the body, the end face of the flange, the shaft hole, the inner diameter of the shell cavity and the end face of the first end of the body are machined. The manufacturing method of the present application is simple in process, simplifies the structure and manufacturing process of the product, and can complete the machining of the inner diameter of the body, the port, the outer diameter of the body and the shaft hole at one time through the clamping portion. The present application is low in cost, high in machining efficiency, can ensure the consistency of the concentricity of the machining positions and the perpendicularity of the flange and the body.

Description

Technical Field

[0001] This invention relates to the field of external rotor motor technology, specifically to a method for manufacturing the magnetic component housing of an external rotor motor, the housing assembly, and an airflow generator. Background Technology

[0002] An electric motor is a device that uses electrical energy to change the direction of a coil's magnetic field and generate rotation through its interaction with a magnetic ring. It is widely used in electric products, such as fans. This patent improves upon the external rotor motor, primarily focusing on the magnetic component housing of a DC external rotor motor. Typically, the magnetic component housing of this type of motor has an open end and a closed end. The housing is made of stretched metal and has a connecting flange on the outside. This flange is used to connect to the impeller of a fan-type motor. Due to the thin wall thickness, a shaft fixing sleeve needs to be fixed in the middle of the closed end to install the rotor shaft.

[0003] During production, the magnetic component housing, flange, and rotor shaft fixing sleeve are manufactured separately using different equipment. The magnetic component housing requires multiple stretching and forming processes using a high-tonnage hydraulic press, the flange is stamped using a stamping machine, and the rotor shaft is machined by turning. During assembly, the flange and rotor shaft fixing sleeve are pre-assembled and then fixed to the housing by spot welding. Due to the installation accuracy requirements for the inner and outer diameters, end faces, and both end faces of the flange of the magnetic component housing, it is necessary to clamp the rear outer diameter of the magnetic component housing, machine the front end face of the flange and the front part of the outer diameter, end face, and inner diameter of the magnetic component housing, and then reverse the orientation of the magnetic component housing, clamp the inner diameter from the front end of the magnetic ring, and machine the front and rear end faces of the flange and the rear part of the outer diameter of the magnetic component housing.

[0004] The inventors have discovered that the existing magnetic component housing of external rotor motors, due to the separate manufacturing of the magnetic component housing, flange, and shaft fixing sleeve, requires spot welding for fixing and two clamping operations with reversed orientation. This manufacturing process requires multiple processes and multiple clamping operations, making it difficult to guarantee the concentricity of the inner and outer diameters of the housing, the shaft hole, and the flange. As a result, the cost is high, the efficiency is low, and the precision is poor. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art where the processing and assembly of the magnetic component housing, flange, and shaft fixing sleeve of an external rotor motor requires multiple processes and clamping, resulting in high cost, low efficiency, and difficulty in ensuring concentricity. The invention achieves this by integrally forming the flange and shaft hole onto the body through die casting, and die casting the clamping part at the end of the body, which is then processed in a single clamping machine.

[0006] The solution adopted in this invention is as follows:

[0007] A method for manufacturing the housing of the magnetic component of an external rotating motor includes:

[0008] Die casting process: The body is made of metal and is die-cast in a die casting machine. The body includes:

[0009] - At the first and second ends, a shell cavity is formed inside the body. The first end connects to the shell cavity to form the open end of the body, and the second end is a closed end.

[0010] - Shaft hole, die-cast into the center of the second end;

[0011] - Clamping part, die-cast on the outside of the second end, including die-cast jaw and clamping surface, the jaw penetrating the outer side and end face of the second end;

[0012] - The flange is die-cast and formed at a preset distance from the first end on the outer surface of the body, dividing the outer surface of the body into a first part near the first end and a second part near the second end.

[0013] Machining process: The clamping part is held by rotating jaws on a machining equipment, and the following parts are machined:

[0014] -The first part of the outer diameter of the body and the first end face of the flange;

[0015] -The second part of the outer diameter of the main body and the second end face of the flange;

[0016] - Shaft hole;

[0017] - Shell cavity inner diameter;

[0018] - The end face of the first end of the body.

[0019] The manufacturing method of this patent involves using die casting to create the main body, which is integrally formed with the shaft hole, clamping part, and flange. This simple process simplifies the product's structure and manufacturing process. When machining the inner diameter, port, outer diameter, and shaft hole of the main body, the machining can be completed in one clamping operation using the clamping part, resulting in low cost and high processing efficiency. This single clamping operation ensures the consistency of concentricity of the machined parts and the perpendicularity of the flange and the main body. The structure of the clamping part prevents interference with the tool path during the machining of the outer diameter of the main body, and also provides a more stable clamping experience.

[0020] Furthermore, a locking hole for connecting the shaft hole is die-cast on at least one of the clamping surfaces, and threads are machined into the locking hole. With this structure, the rotor shaft can be secured by bolts locked into the locking hole during installation, simplifying the rotor shaft installation structure. Additionally, the clamping surfaces facilitate bolt accommodating, simplifying the housing structure.

[0021] Furthermore, the holding part has three or more die-cast parts that are equidistantly distributed around the axis of the shaft hole. Using the above design, the holding part is suitable for jaw clamping.

[0022] Furthermore, a die-cast boss is formed in the middle of the inner end of the housing cavity, and the shaft hole is formed in the center of the boss. A metal hoop is inserted into the outside of the boss, and the coefficient of thermal expansion of the metal hoop is less than that of the boss. Since the body is made of die-cast metal material, during the operation of the product, the heat generated by the motor stator winding module causes the body to expand, which in turn enlarges the shaft hole, causing the rotor shaft assembled inside to loosen. Because the coefficient of thermal expansion of the metal hoop is less than that of the boss, when the boss expands due to heat, the metal hoop restricts its outward expansion, causing this part to expand towards the shaft hole, thus squeezing the rotor shaft assembled inside. As the degree of thermal expansion increases, the holding force of the shaft hole on the rotor shaft increases, increasing the friction between the two and making the connection more stable.

[0023] Furthermore, several positioning posts are die-cast into the inner end of the shell cavity, located outside the boss. Correspondingly, several positioning holes are provided on the metal hoop. The positioning holes are fitted into the corresponding positioning posts, and the positioning posts are deformed on a stamping machine to tighten them onto the metal hoop. Using this method to install the metal hoop results in a simple structure and reliable connection.

[0024] Furthermore, the flange is die-cast with several connection holes.

[0025] Housing assembly The main body is integrally die-cast from metal material, including a first end and a second end arranged opposite to each other. A shell cavity is formed inside the main body. The first end connects to the shell cavity to form the open end of the main body, and the second end is a closed end. A shaft hole is die-cast in the center of the second end. Three or more clamping parts are die-cast on the outside of the second end, which are equidistantly distributed around the axis of the shaft hole. Each clamping part includes a clamping surface. A flange is die-cast at a predetermined distance from the first end on the outer surface of the main body, dividing the outer surface of the main body into a first part near the first end and a second part near the second end. A locking shaft hole is die-cast in at least one clamping surface. The following parts are machined: the first part of the outer diameter of the main body and the first end face of the flange; the second part of the outer diameter of the main body and the second end face of the flange; the inner diameter of the shell cavity and the end face of the first end of the main body; the shaft hole; threads are machined on the locking shaft hole; the inner end of the rotor shaft is inserted into the shaft hole and fixed to its inner end by screws. The main body of this patent is made by die casting and is integrally formed with shaft hole, clamping part and flange. The process is simple and simplifies the structure and manufacturing process of the product. When machining the inner diameter, port, outer diameter and shaft hole of the main body, the machining can be completed in one clamping by the clamping part, which is low cost and high processing efficiency. Through one clamping, the concentricity of the machined parts can be ensured.

[0026] By adopting the above scheme, the principle of thermal expansion difference between different materials is used to make the fit between the rotor shaft and the shaft hole more robust and reliable.

[0027] The airflow generator includes: a housing assembly, a magnetic component, a mounting base, a stator winding module, and fan blades. The inner end of the rotor shaft is inserted into a shaft hole, and screws are fitted into a locking hole, with their inner ends abutting against a locking part at the inner end of the rotor shaft. The magnetic component is mounted on the inner wall of the housing cavity of the main body. The mounting base includes a rotating shaft fixing sleeve formed in the middle of the mounting base and extending towards one side of the inner wall of the housing cavity. The stator winding module is fixedly mounted on the outer side of the rotating shaft fixing sleeve. The rotating shaft fixing sleeve is mounted on the outer side of the rotor shaft via bearings. The mounting base is mounted at the port of the main body. The fan blades are connected to a flange. This patented airflow generator, with its external rotating motor magnetic component housing, features a simple manufacturing process, simplifying the product's structure and manufacturing process. It can be processed in one clamping operation, resulting in low cost and high processing efficiency. One-time clamping ensures consistent concentricity of the processed parts of the external rotating motor magnetic component housing. Assembly is simple and quick, resulting in a compact overall product with high precision. Attached Figure Description

[0028] Figure 1 This is the process of Embodiment 1 of the present invention. Figure 1

[0029] Figure 2 This is the process of Embodiment 1 of the present invention. Figure 2

[0030] Figure 3 This is the process of Embodiment 1 of the present invention. Figure 3

[0031] Figure 4 This is the process of Embodiment 1 of the present invention. Figure 4

[0032] Figure 5 This is a three-dimensional schematic diagram of the outer shell of the magnetic component of the present invention. Figure 1

[0033] Figure 6 This is a three-dimensional schematic diagram of the outer shell of the magnetic component of the present invention. Figure 2

[0034] Figure 7 This is a three-dimensional schematic diagram of the outer shell of the magnetic component of the present invention. Figure 3

[0035] Figure 8 This is a rear view of the housing of the magnetic component of the present invention.

[0036] Figure 9 This is a cross-sectional view of the outer shell of the magnetic component of the present invention.

[0037] Figure 10 This is a perspective view of another embodiment of the magnetic component housing of the present invention.

[0038] Figure 11 This is an exploded view of another embodiment of the magnetic component housing of the present invention.

[0039] Figure 12 This is a cross-sectional view of another embodiment of the magnetic component housing of the present invention.

[0040] Figure 13 This is a perspective view of the housing assembly of the present invention.

[0041] Figure 14 This is a cross-sectional view of the housing assembly of the present invention.

[0042] Figure 15 The three-dimensional representation of the motor of the present invention Figure 1

[0043] Figure 16 The three-dimensional representation of the motor of the present invention Figure 2

[0044] Figure 17 A cross-sectional view of one embodiment of the motor of the present invention.

[0045] Figure 18 A perspective view of one embodiment of the airflow generator of the present invention.

[0046] Figure 19 A cross-sectional view of one embodiment of the airflow generator of the present invention. Detailed Implementation

[0047] The technical solution of the present invention is described below with reference to the accompanying drawings:

[0048] Example 1: Method for manufacturing the housing of the magnetic component of an external rotating motor

[0049] See Figure 1 , Figures 5 to 9 The manufacturing method of the magnetic component housing of the external rotating motor includes the following steps:

[0050] S01 Die-casting process: A metal body 1.1 is die-cast in a die-casting machine. The body 1.1 includes: a first end 1.11 and a second end 1.12. A cavity 100 is formed inside the body 1.1. The first end 1.11 connects to the cavity 100 to form the open end of the body 1.1, and the second end 1.12 is the closed end. A shaft hole 10 is die-cast and formed at the center of the second end 1.12. A clamping part 1.2 is die-cast and formed on the outside of the second end 1.12, including a die-cast jaw 1.21 and a clamping surface 1.22. The jaw 1.21 penetrates the outer side and end face of the second end 1.12. A flange 1.3 is die-cast and formed at a predetermined distance from the first end 1.11 on the outer surface of the body 1.1, dividing the outer surface of the body 1.1 into a first part 1.1a near the first end 1.11 and a second part 1.1b near the second end 1.12.

[0051] S02 Machining Process: On a CNC lathe, the clamping part 1.2 is held by rotating jaws, and the following parts are machined:

[0052] The outer diameter of body 1.1 is defined by the first part 1.1a and the first end 1.11 face of flange 1.3; the outer diameter of body 1.1 is defined by the second part 1.1b and the second end 1.12 face of flange 1.3; shaft hole 10; inner diameter of shell cavity 100; and end face of the first end 1.11 of body 1.1. During the above machining process, the tool used according to the machining path can be changed automatically using the tool changing function of the CNC lathe.

[0053] The manufacturing method of this patent involves using die casting to form the body 1.1, which is integrally formed with the shaft hole 10, clamping part 1.2, and flange 1.3. This process is simple and simplifies the product structure and manufacturing process. When machining the inner diameter, port, outer diameter, and shaft hole 10 of the body using a CNC lathe, the machining can be completed in one clamping operation using the clamping part 1.2, resulting in low cost and high processing efficiency. Through one clamping operation, the concentricity of the machined parts can be ensured, as well as the perpendicularity between the flange 1.3 and the body 1.1.

[0054] One of the clamping surfaces 1.22 is die-cast to form a locking hole 1.4 for the connecting shaft hole 10, and then threads are machined in the locking hole 1.4 using a threading machine. With this structure, the rotor shaft 3 can be fixed by bolts inserted into the locking hole 1.4 during installation, simplifying the installation structure of the rotor shaft 3. Furthermore, the clamping surface 1.22 facilitates the storage of bolts, simplifying the structure of the housing.

[0055] The clamping part 1.2 is die-cast with three or more parts, equidistantly distributed around the axis of the shaft hole 10. Using this design, the clamping part 1.2 is suitable for gripping in CNC machining equipment, such as hydraulic three-jaw chucks and hydraulic jaws.

[0056] The clamping part 1.2 includes a jaw 1.21 formed by die casting and a clamping surface 1.22, which can prevent the tool path from being affected when machining the outer diameter of the body 1.1; and the clamping is more stable.

[0057] See Figures 10 to 15A die-cast boss 1.5 is formed in the middle of the inner end of the housing cavity 100, and a shaft hole 10 is formed in the center of the boss 1.5. A metal clamp 2 is inserted into the outside of the boss 1.5. The coefficient of thermal expansion of the metal clamp 2 is less than that of the boss 1.5. Since the body 1.2 is made of die-cast metal material, during the operation of the product, the heat generated by the motor stator winding module causes the body 1.1 to expand, which in turn makes the shaft hole 10 larger. This causes the rotor shaft 3 assembled inside it to loosen. Since the coefficient of thermal expansion of the metal clamp 2 is less than that of the boss 1.5, when the part of the boss 1.5 expands due to heat, it cannot extend outward due to the restriction of the metal clamp 2. This causes the part to expand towards the shaft hole 10, thereby squeezing the rotor shaft 3 assembled inside it. As the degree of thermal expansion increases, the holding force of the shaft hole 10 on the rotor shaft 3 increases, increasing the friction between the two and making the connection more stable.

[0058] Several positioning posts 1.51 are die-cast inside the shell cavity 100, located outside the boss 1.5. Correspondingly, several positioning holes 2.1 are provided on the metal hoop 2. The positioning holes 2.1 are fitted into the corresponding positioning posts 1.51, and the positioning posts 1.51 are deformed on a stamping machine to tighten them onto the metal hoop 2. Using this method to install the metal hoop 2 results in a simple structure and reliable connection.

[0059] The main body 1.1 can be die-cast from aluminum alloy, and the metal hoop 2 can be made of iron, stainless steel, or other applicable and known materials.

[0060] See Figure 2 In one embodiment, the metal clamp 2 is installed after the machining process and the thread of the locking shaft hole 1.4 are completed.

[0061] See Figure 3 In the preferred embodiment, the metal clamp 2 is installed after the rotor shaft 3 is installed. This method is simple to install and can avoid the deformation of the shaft hole 10 caused by installing the metal clamp 2 first, which would affect the installation of the rotor shaft 3.

[0062] See Figure 4 By installing the metal clamp 2 before performing the machining process, the size of the shaft hole 10 can be guaranteed, and the deformation of the shaft hole 10 caused by installing the metal clamp 2 first can be avoided, which would affect the installation of the rotor shaft 3.

[0063] In this embodiment, the step of machining the thread in the locking hole 1.4 can also be performed before the machining process, as needed.

[0064] See Figure 7A rib 1.9 is provided at the inner end of the shell cavity 100 corresponding to the position of the clamping part 1.2. The inner end of the rib 1.9 is connected to the boss 1.5, and the inner end of the rib 1.9 is formed with a mounting surface 1.91. The positioning post 1.51 is formed on the mounting surface 1.91, and the metal clamp 2 is mounted on the mounting surface 1.91. With the above solution, the rib 1.9 provides positional space for the clamping part 1.2, thereby reducing the thickness of other parts of the second end 1.12 of the body 1.1, saving materials and reducing costs.

[0065] In one embodiment, the metal hoop 2 has a wall thickness of 2mm-10mm and a height of 2-5mm.

[0066] See Figure 1 , Figure 5 and Figure 9 The flange has several die-cast connection holes 1.30 for installing and fixing the main body 1.1.

[0067] A boss 1.32 is formed on one side of the flange, and a connecting hole 1.30 is formed on the boss 1.32. The surface of the boss 1.32 is the second end face 1.32 of the connecting part. This structure reduces the material of the flange while ensuring the strength of the connecting part.

[0068] Example 2: Housing Assembly

[0069] See Figures 5 to 9The outer casing assembly S includes a magnetic component casing 1 and a shaft 3. The body 1.1 is integrally die-cast from metal material and includes a first end 1.11 and a second end 1.12 arranged opposite to each other. A cavity 100 is formed inside the body 1.1. The first end 1.11 communicates with the cavity 100 to form the open end of the body 1.1, and the second end 1.12 is the closed end. A shaft hole 100 is die-cast at the center of the second end 1.12. Three clamping parts 1.2 are die-cast on the outside of the second end 1.12, which are equidistantly distributed around the axis of the shaft hole 100. Each clamping part 1.2 includes a clamping surface 1.22. The first end 1.11 is located on the outer surface of the body 1.1 at a distance from the first end 1.11. A flange 1.31.3 is die-cast at a predetermined distance from end 1.11, dividing the outer surface of the body 1.1 into a first part 1.1a near the first end 1.11 and a second part 1.1b near the second end 1.12. A locking shaft hole 1.4 is die-cast within a clamping surface 1.22. The following parts are machined: the outer diameter of the body 1.1 at the first part 1.1a and the face of the first end 1.11 of the flange 1.3; the outer diameter of the body 1.1 at the second part 1.1b and the face of the second end 1.12 of the flange 1.3; the inner diameter of the cavity 100 and the end face of the first end 1.11 of the body 1.1; the shaft hole 100; and threads are machined on the locking shaft hole 1.4. The inner end of the rotor shaft 3 is inserted into the shaft hole 10, and the inner end of the rotor shaft 3 is provided with a locking part 3.1. A screw is assembled in the locking shaft hole 1.4 and abuts against the locking part 2.1 at its inner end. The body 1.1 of this patent is manufactured using a die-casting process, integrally forming the shaft hole 100, clamping part 1.2, and flange 1.3. This simple process simplifies the product's structure and manufacturing process. When machining the inner diameter, port, outer diameter, and shaft hole 100 of the body 1.1, all machining can be completed in one step using the clamping part 1.2, resulting in low cost and high processing efficiency. This single-step machining ensures consistent concentricity of the machined parts. When installing the rotor shaft 3, it can be fixed by screws into the locking shaft hole 1.4, simplifying the rotor shaft installation structure. Furthermore, the clamping surface 1.22 provides convenient screw storage, further simplifying the structure of the body 1.11.

[0070] The clamping part 1.2 is suitable for jaw clamping, such as hydraulic three-jaw chucks, hydraulic jaws, etc.

[0071] The body 1.11 can be die-cast from aluminum alloy or other known and applicable materials.

[0072] In other embodiments, the clamping part 1.2 may also be designed with four or more parts as needed.

[0073] See Figure 2 , Figure 3 and Figure 7The clamping part 1.2 also includes a die-cast bayonet 1.21, with a clamping surface 1.22 formed within the bayonet 1.21. The bayonet 1.21 extends through the outer side and end face of the second end 1.12. This configuration facilitates the clamping and prevents interference with the tool path during machining of the outer diameter of the body 1.1 (if necessary); moreover, the clamping is more stable.

[0074] See Figures 8 to 12 In one improved embodiment, a boss 1.5 extends inward from the middle of the inner end of the cavity 100. The shaft hole 10 is formed at the center of the boss 1.5. A metal clamp 2 is attached to the outside of the boss 1.5. The coefficient of thermal expansion of the metal clamp 2 is less than that of the boss 1.5. Since the body is made of die-cast metal, during operation, the motor stator winding module heats up, causing the body 1.1 to expand. This enlarges the shaft hole 10, causing the rotor shaft 3 assembled inside to loosen. Because the coefficient of thermal expansion of the metal clamp 2 is less than that of the boss 1.5, when the boss 1.5 expands due to heat, it cannot extend outward due to the restriction of the metal clamp 2. Instead, it expands towards the shaft hole 10, thus squeezing the rotor shaft 3 assembled inside. As the degree of thermal expansion increases, the gripping force of the shaft hole 10 on the rotor shaft 3 increases, increasing the friction between the two and making the connection more stable.

[0075] One installation method for the metal hoop 2 is as follows: A plurality of positioning posts 1.51 are formed at the inner end of the shell cavity 100 outside the protrusion 1.5. A plurality of positioning post holes 2.1 are correspondingly provided on the metal hoop 2. After each positioning post 1.51 is fitted into its corresponding hole 2.1, the metal hoop 2 is tightened by pressing and deforming the positioning post 1.51. Using this method to install the metal hoop 2 results in a simple structure and reliable connection.

[0076] The outer shell 1 of the magnetic component can be die-cast from aluminum alloy, and the metal hoop 2 can be made of iron, stainless steel, or other applicable and known materials.

[0077] See Figure 9 A rib 1.9 is provided at the inner end of the shell cavity 100 corresponding to the position of the clamping part 1.2. The inner end of the rib 1.9 is connected to the boss 1.5, and the inner end of the rib 1.9 is formed with a mounting surface 1.91. The positioning post 1.51 is formed on the mounting surface 1.91, and the metal clamp 2 is mounted on the mounting surface 1.91. With the above solution, the rib 1.9 provides positional space for the clamping part 1.2, thereby reducing the thickness of other parts of the second end 1.12 of the body 1.1, saving materials and reducing costs.

[0078] In one embodiment, the metal hoop 2 has a wall thickness of 2mm-10mm and a height of 2-5mm.

[0079] See Figure 3 , Figure 4and Figure 7 The flange has several die-cast connection holes 1.30 for installing and fixing the main body 1.1.

[0080] A boss 1.32 is formed on one side of the flange, and a connecting hole 1.30 is formed on the boss 1.32. The surface of the boss 1.32 is the second end face 1.32 of the connecting part. This structure reduces the material of the flange while ensuring the strength of the connecting part.

[0081] Example 3: Airflow Generator

[0082] See Figures 12 to 17 The airflow generator includes: a housing assembly S, a magnetic component 5, a mounting base 6, a stator winding module 7, and a fan blade 8. The magnetic component 5 is mounted on the inner wall of the housing cavity 100 of the body 1.1; the mounting base 6 includes an annular joint 6.1 that engages with the port of the body 1, and a shaft fixing sleeve 6.2 formed in the middle and extending towards the inner wall of the housing cavity 100; the stator winding module 7 is fixedly mounted on the outer side of the shaft fixing sleeve 6.2; the shaft fixing sleeve 6.2 is mounted on the outer side of the rotor shaft 3 via a bearing K, and is axially limited by a limiting step 6.21 in the inner hole of the stator fixing sleeve 6.2 and a snap ring (not shown) mounted on the rotor shaft 3; the mounting base 6 is mounted at the port of the body 1; the fan blade 8 is mounted on the connecting part 1.3. The airflow generator of this patent features a simple and streamlined outer casing 1 for the magnetic component of the external rotating motor, simplifying the product's structure and manufacturing process. It can be machined in a single clamping operation using the clamping part 1.2, resulting in low cost and high processing efficiency. This single clamping operation ensures consistent concentricity of the machined areas on the magnetic component casing 1. Assembly is simple and quick, resulting in a compact and highly precise product. A mounting part 6.3 is provided along the outer edge of the fixing base 6, through which the airflow generating device is mounted and fixed.

[0083] like Figures 12 to 17 As shown, the outer side of the mounting base 6 is connected to the mounting base housing 9, and the circuit module e is installed inside the mounting base housing 9.

[0084] The structures of the stator winding module 7 and the magnetic component 5 are not improvements of this patent and will not be described in detail. They can be implemented using existing known solutions.

[0085] A boss 1.5 extends inward from the middle of the inner end of the housing cavity 100. The shaft hole is formed at the center of the boss 1.5. A metal clamp 2 is attached to the outside of the boss 1.5. The coefficient of thermal expansion of the metal clamp 2 is less than that of the boss 1.5. Since the body is made of die-cast metal, during operation, the motor stator winding module heats up, causing the body to expand and the shaft hole to enlarge. This leads to loosening of the rotor shaft assembled inside. Because the coefficient of thermal expansion of the metal clamp 2 is less than that of the boss 1.5, when the boss 1.5 expands due to heat, it cannot extend outward due to the restriction of the metal clamp 2. Instead, it expands towards the shaft hole, thus squeezing the rotor shaft assembled inside. As the degree of thermal expansion increases, the holding force of the shaft hole 10 on the rotor shaft 3 increases, increasing the friction between the two and making the connection more stable.

[0086] For the installation structure of the metal hoop 2, please refer to Examples 1 and 2.

[0087] The other structures and technical effects of the outer casing assembly S are illustrated in Embodiment 2 and will not be repeated here.

[0088] The combination of features between the embodiments of this patent is also within the scope of protection of this invention.

[0089] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. The present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention.

Claims

1. A method for manufacturing the housing of the magnetic component of an external rotating motor, characterized in that, include: Die casting process: The body is made of metal and is die-cast in a die casting machine. The body includes: - At the first and second ends, a shell cavity is formed inside the body. The first end connects to the shell cavity to form the open end of the body, and the second end is a closed end. - Shaft hole, die-cast into the center of the second end; - The clamping part, die-cast into the exterior of the second end, includes a jaw and a clamping surface, the jaw penetrating the outer side and end face of the second end; and The locking hole of the connecting shaft hole is die-cast on at least one of the clamping surfaces; - The flange is die-cast and formed at a preset distance from the first end on the outer surface of the body, dividing the outer surface of the body into a first part near the first end and a second part near the second end. Machining process: The clamping part is held by rotating jaws on a machining equipment, and the following parts are machined: -The first part of the outer diameter of the body and the first end face of the flange; -The second part of the outer diameter of the main body and the second end face of the flange; - Shaft hole; - Shell cavity inner diameter; - The end face of the first end of the body; threads are machined in the lock shaft hole.

2. The method for manufacturing the magnetic component housing of the external rotating motor according to claim 1, characterized in that, The clamping part has three or more die-cast parts that are evenly spaced around the axis of the shaft hole.

3. The method for manufacturing the magnetic component housing of the external rotating motor according to claim 1, characterized in that, A die-cast boss is placed in the middle of the inner end of the housing cavity, and the shaft hole is formed in the center of the boss; a metal hoop is inserted into the outside of the boss, and the coefficient of thermal expansion of the metal hoop is less than that of the boss. Alternatively, the metal hoop is installed after the rotor shaft is installed into the shaft hole.

4. The method for manufacturing the magnetic component housing of the external rotating motor according to claim 3, characterized in that, Several positioning posts are die-cast on the outer side of the boss at the inner end of the shell cavity. Several positioning holes are correspondingly provided on the metal hoop. The positioning holes are fitted into the corresponding positioning posts, and the positioning posts are deformed on the stamping machine to make them rivet the metal hoop.

5. The method for manufacturing the magnetic component housing of the external rotating motor according to claim 1, characterized in that, The flange has several connection holes formed by die casting.

6. The housing assembly of the external rotating motor, characterized in that, include: The body is integrally die-cast from metal material and includes a first end and a second end arranged opposite to each other. A shell cavity is formed inside the body. The first end connects to the shell cavity to form the open end of the body, and the second end is a closed end. The shaft hole is die-cast into the center of the second end; Three or more clamping parts are die-cast on the outside of the second end and are equidistantly distributed around the axis of the shaft hole. Each clamping part includes a bayonet and a clamping surface. The clamping surface is formed inside the bayonet, and the bayonet penetrates the outer side and end face of the second end. The flange is die-cast and formed at a predetermined distance from the first end on the outer surface of the body, dividing the outer surface of the body into a first part near the first end and a second part near the second end. The locking shaft hole is die-cast within at least one clamping surface; The following parts are machined: the first part of the outer diameter of the body and the first end face of the flange; the second part of the outer diameter of the body and the second end face of the flange; the inner diameter of the shell cavity and the end face of the first end of the body; the shaft hole; Machining threads on the lock shaft hole; The rotor shaft is inserted into the shaft hole and fixed to the inner end by screws in the locking hole.

7. The housing assembly according to claim 6, characterized in that, A boss is die-cast in the middle of the inner end of the shell cavity, and the shaft hole is formed in the center of the boss. A metal band is inserted into the outside of the boss, and the coefficient of thermal expansion of the metal band is less than that of the boss.

8. An airflow generator, characterized in that, include: The housing assembly as described in claim 6 or 7; Magnetic components are assembled into the inner wall of the shell cavity of the main body; The fixing seat includes a rotating shaft fixing sleeve formed in the middle of the fixing seat and extending toward the inner wall of the shell cavity; The stator winding module is fixedly assembled on the outside of the shaft fixing sleeve; Fan blades, connected to the flange; The rotating shaft fixing sleeve is installed on the outside of the rotor shaft via bearings, and the fixing seat is assembled at the port of the main body.

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