A method of manufacturing a rotor assembly

Abstract

A manufacturing method of a rotor assembly, comprising the following steps: S1, manufacturing a first shaft sleeve and a rotor; S2, forming a first injection molded body by injection molding with the rotor and the first shaft sleeve as injection molded inserts; and any one of the following steps: S3, forming a second injection molded body by injection molding with at least the first injection molded body as an injection molded insert; the lower cover plate and the vane in the second injection molded body are in an integrated structure; S4, forming a second injection molded body by injection molding with at least the first injection molded body as an injection molded insert; the second injection molded body comprises the lower cover plate, the vane and the upper cover plate of the rotor assembly in an integrated structure; S5, forming a second injection molded body by injection molding with at least the first injection molded body as an injection molded insert; the upper end of the vane of the second injection molded body is fixedly connected with the upper cover plate of the rotor assembly; S6, forming a second injection molded body by injection molding with at least the first injection molded body as an injection molded insert; the upper end of the vane is fixedly connected with the upper cover plate, and the lower end of the vane is fixedly connected with the lower cover plate; thus the manufacturing cost of the rotor assembly is reduced.

Description

Technical Field

[0001] This invention relates to a method for manufacturing a rotor assembly. Background Technology

[0002] An electric pump includes a pump shaft and a rotor assembly. The rotor assembly is located on the outer periphery of the pump shaft and rotates around or with the pump shaft. The rotor assembly includes multiple components such as a rotor, a lower cover plate, and blades. To reduce friction during rotation, a bushing is press-fitted into the rotor assembly. During the press-fitting process, the bushing needs to withstand the pressing force, which places relatively high demands on the bushing material and the strength of the connection between the bushing and the rotor assembly, thereby increasing the manufacturing cost of the rotor assembly. Therefore, how to reduce the manufacturing cost of the rotor assembly is a technical issue that needs to be considered. Summary of the Invention

[0003] The purpose of this invention is to provide a method for manufacturing a rotor assembly, which helps to reduce the manufacturing cost of the rotor assembly.

[0004] To achieve the above objectives, one embodiment of this application adopts the following technical solution:

[0005] A method for manufacturing a rotor assembly, the rotor assembly including a rotor and a first shaft sleeve; the method for manufacturing the rotor assembly includes the following steps:

[0006] A method for manufacturing a rotor assembly, wherein the rotor assembly is an injection-molded part, the rotor assembly comprising a rotor and a first bushing; the method for manufacturing the rotor assembly includes the following steps:

[0007] S1, the forming of the first bushing and the rotor;

[0008] S2, using the rotor and the first bushing as injection molding inserts, a first injection molded body is formed by injection molding;

[0009] The method for manufacturing the rotor assembly further includes any one of the following steps S3 to S6:

[0010] S3, at least the first injection molded body is used as an injection molding insert to form a second injection molded body; the second injection molded body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection molded body; the second injection molded body includes a lower cover plate and a blade, the lower cover plate and the blade being an integral injection molded structure;

[0011] S4, at least the first injection molded body is used as an injection molding insert to form a second injection molded body; the second injection molded body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection molded body; the second injection molded body includes a lower cover plate, and the rotor assembly also includes blades and an upper cover plate, the blades and the upper cover plate being an integral structure, the lower end of the blades being fixedly connected to the lower cover plate by welding; step S1 also includes the forming of the blades and the upper cover plate;

[0012] S5, at least the first injection body is used as an injection insert to form a second injection body by injection molding; the second injection body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection body; the second injection body includes a lower cover plate and blades, the rotor assembly also includes an upper cover plate, the upper end of the blades is fixedly connected to the upper cover plate by welding, and step S1 also includes the forming of the upper cover plate;

[0013] S6, at least the first injection molded body is used as an injection molding insert to form a second injection molded body; the second injection molded body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection molded body; the second injection molded body includes a lower cover plate, the rotor assembly also includes blades and an upper cover plate, the upper end of the blades is fixedly connected to the upper cover plate by welding, the lower end of the blades is fixedly connected to the lower cover plate by welding, and step S1 also includes the forming of the blades and the upper cover plate.

[0014] The above manufacturing method allows the first bushing to be fixed by injection molding, which helps to reduce the strength requirements of the first bushing and the connection between the first bushing and the rotor assembly, thereby reducing the manufacturing cost of the first bushing and the connection between the first bushing and the rotor assembly, and thus reducing the manufacturing cost of the rotor assembly. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the electric pump of this application;

[0016] Figure 2 yes Figure 1 A three-dimensional structural schematic diagram of a first embodiment of the central rotor assembly;

[0017] Figure 3 yes Figure 2 A front view structural schematic diagram of the intermediate rotor assembly;

[0018] Figure 4 yes Figure 3 A schematic diagram of a cross-sectional structure of the rotor assembly along section AA;

[0019] Figure 5 yes Figure 4A three-dimensional structural diagram of the first injection-molded part in one direction;

[0020] Figure 6a yes Figure 4 A three-dimensional structural schematic diagram of the first embodiment of the first bushing in one direction;

[0021] Figure 6b yes Figure 4 A three-dimensional structural schematic diagram of the first embodiment of the first bushing in another direction;

[0022] Figure 7 yes Figure 6a or Figure 6b A front view structural schematic diagram of the first bushing in the middle;

[0023] Figure 8 yes Figure 7 A schematic diagram of a cross-sectional structure of the first bushing along section AA;

[0024] Figure 9 yes Figure 4 A three-dimensional structural schematic diagram of a second embodiment of the first bushing;

[0025] Figure 10 yes Figure 4 A three-dimensional structural diagram of the central rotor;

[0026] Figure 11 yes Figure 10 A three-dimensional structural diagram of the rotor core;

[0027] Figure 12 yes Figure 10 A front view schematic diagram of the central rotor;

[0028] Figure 13 yes Figure 4 A three-dimensional structural diagram of the first injection-molded body in another direction;

[0029] Figure 14 yes Figure 1 A cross-sectional structural schematic diagram of a second embodiment of the central rotor assembly;

[0030] Figure 15 yes Figure 14 A three-dimensional structural diagram of the central rotor;

[0031] Figure 16 This is a schematic flowchart of a method for manufacturing a rotor assembly in the first and second embodiments.

[0032] Figure 17 yes Figure 1A cross-sectional structural schematic diagram of a third embodiment of the central rotor assembly;

[0033] Figure 18 This is a flowchart illustrating one step of the manufacturing method of the rotor assembly in the third embodiment;

[0034] Figure 19 yes Figure 1 A cross-sectional structural schematic diagram of a fourth embodiment of the central rotor assembly;

[0035] Figure 20 This is a flowchart illustrating one step of the manufacturing method of the rotor assembly in the fourth embodiment;

[0036] Figure 21 yes Figure 1 A cross-sectional structural schematic diagram of a fifth embodiment of the rotor assembly;

[0037] Figure 22 This is a flowchart illustrating one step of the manufacturing method of the rotor assembly in the fifth embodiment. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0039] The electric pump in the following embodiments can provide flow power for the working medium of the automotive thermal management system. The working medium can be a 50% aqueous solution of ethylene glycol or water, or other components.

[0040] See Figure 1 The electric pump 100 includes a pump housing, a rotor assembly 1, a stator assembly 2, a pump shaft 3, and an isolation section 4. The rotor assembly 1 is sleeved on the outer periphery of the pump shaft 3. The electric pump 100 includes a pump cavity, and the isolation section 4 divides the pump cavity into a first cavity 80 and a second cavity 90. The first cavity 80 allows the working medium to flow through, while the second cavity 90 does not directly contact the working medium. The rotor assembly 1 is located in the first cavity 80, and the stator assembly 2 is located in the second cavity 80. See also... Figure 1 The stator assembly 2 includes a stator core 21, an insulating frame 23, and a winding 22. The insulating frame 23 covers at least a portion of the surface of the stator core 21, and the winding 22 is wound around the insulating frame 23. In this way, the insulating frame 23 can be used to prevent electrical conduction between the stator core 21 and the winding 22. When the electric pump 100 is working, the excitation magnetic field generated by the stator assembly 2 is controlled by controlling the current passing through the winding 22 of the stator assembly 2. The rotor assembly 1 rotates around the pump shaft 3 or together with the pump shaft 3 under the action of the excitation magnetic field.

[0041] The rotor assembly in this application will be described in detail below; it should be noted that, for ease of description, the directional terms such as "upper," "lower," "higher," and "lower" mentioned below refer to the rotor assembly in terms of orientation. Figure 3 The position shown is the reference point when placing it.

[0042] See Figure 2 , Figure 2 This is a schematic diagram of the first embodiment of the rotor assembly. The first embodiment of the rotor assembly will be described in detail below.

[0043] See Figures 2 to 5 The rotor assembly 1 includes a first injection-molded body 11, which includes a first bushing 13, a rotor 14, and a connecting portion 16. The rotor 14 is made of permanent magnet material. The rotor 14 is located on the outer periphery of the first bushing 13. The connecting portion 16 connects the rotor 14 and the first bushing 13. The connecting portion 16 is made of plastic. In this embodiment, the first injection-molded body 11 is formed by injection molding using the rotor 14 and the first bushing 13 as injection-molded inserts. The connecting portion 16 is formed by injecting plastic. The first injection-molded body 11 is a single integral part. A second injection-molded body 12 is formed by injection molding using the first injection-molded body 11 as an insert. See also... Figure 3 and Figure 4 The second injection-molded body 12 includes a lower cover plate 121 and a wrapping layer 122, with the wrapping layer 122 wrapping a portion of the outer peripheral surface of the first injection-molded body 11. In this embodiment, the rotor assembly 1 also includes blades 15. Along the axial direction of the rotor assembly 1, the lower cover plate 121 is closer to the rotor 14 than the blades 15. In this embodiment, the blades 15 and the lower cover plate 121 are an integral structure. Here, "integral structure" means that the blades 15 and the lower cover plate 121 are formed integrally by injection molding. Of course, the blades 15 and the lower cover plate 121 can also be separately arranged. Specifically, refer to the fourth and fifth embodiments of the rotor assembly, which will not be elaborated here. Through the above structure, the first bushing 13 is fixed by injection molding, which helps to reduce the strength requirements of the material of the first bushing 13 and the connection between the first bushing 13 and the rotor assembly, thereby helping to reduce the material cost of the first bushing 13 and the connection between the first bushing 13 and the rotor assembly, and thus helping to reduce the manufacturing cost of the rotor assembly.

[0044] See Figure 4 and Figure 5In this embodiment, the connection between the rotor 14 and the first bushing 13 is the plastic part of the first injection molded body 11, and the lower cover plate 121, the wrapping layer 122, and the blades of the second injection molded body 12 are the plastic parts of the second injection molded body 12. The materials of the plastic parts of the first injection molded body 11 and the second injection molded body 12 can be the same or different. When the materials of the plastic parts of the first injection molded body 11 and the second injection molded body 12 are different, the plastic parts of the second injection molded body 12 can be designed to have higher corrosion resistance than the plastic parts of the first injection molded body 11, because the plastic parts of the second injection molded body 12 are in contact with the working medium. In addition, because the plastic parts of the second injection molded body 12 will be subjected to the force of the working medium when in contact with it, the plastic parts of the second injection molded body 12 may be at risk of breakage. Therefore, when the materials of the plastic parts of the first injection molded body 11 and the second injection molded body 12 are different, the plastic parts of the second injection molded body 12 can be designed to have higher toughness than the plastic parts of the first injection molded body 11.

[0045] The first bushing of the rotor assembly in the first embodiment will be described in detail below.

[0046] See Figures 6a to 8 , Figures 6a to 8 This is a schematic diagram of the first embodiment of the first bushing; the structure of the first embodiment of the first bushing will be described in detail below.

[0047] See Figure 4 In this embodiment, along the axial direction of the rotor assembly 1, the axial height of the first bushing 13 is greater than the axial height of the rotor 14, the upper end face of the first bushing 13 is higher than the upper end face of the rotor 14, and the lower end face of the first bushing 13 is lower than the lower end face of the rotor 14; combined with Figure 1 In this embodiment, the axial length of the first bushing 13 is greater than or equal to half the axial length of the pump shaft 3. This is beneficial to relatively increase the radial support area of ​​the pump shaft 3 on the first bushing 13, thereby reducing the friction between the pump shaft 3 and the first bushing 13.

[0048] See Figures 6a to 8In this embodiment, the first bushing 13 includes a body portion 130 and at least one limiting portion 131. The limiting portion 131 protrudes from the outer peripheral surface of the body portion 130 and extends axially along the first bushing 13. The axial length of the limiting portion 131 is less than the axial length of the body portion 130. Specifically, the upper end face of the limiting portion 131 is below the upper end face of the body portion 130, and the lower end face of the limiting portion 131 is above the lower end face of the body portion 130. This allows the first injection-molded body 11 to form connecting portions at locations above the upper end face of the limiting portion 131 and below the lower end face of the limiting portion 131 during injection molding, thereby helping to prevent axial movement of the first bushing 13 during use. Furthermore, the first injection-molded body 11 can form connecting portions on the outer peripheral surface and side surface of the limiting portion 131 during injection molding, thereby helping to prevent radial movement of the first bushing 13 during use. See also... Figure 7 In this embodiment, the first bushing 13 includes six limiting parts 131, which are evenly distributed along the circumference of the first bushing 13. Of course, the limiting parts 131 can also be non-uniformly distributed along the circumference of the first bushing 13. In addition, the number of limiting parts 131 can be two, three or other numbers.

[0049] See Figures 6a to 8 The first bushing 13 also includes a first recess 132 and a first hole 133, the first hole 133 extending axially along the first bushing 13. Figure 1 The pump shaft 3 extends into the cavity of the first hole 133 and is fitted with the inner circumferential surface of the first hole 133 with a clearance. The first recess 132 is recessed from the inner circumferential surface of the first hole 133 and extends axially along the first hole 133. In this embodiment, the first recess 132 penetrates the upper and lower end faces of the first bushing 13 along the axial direction of the first hole 133. Figure 1 In this way, when the electric pump is working, some of the working medium can flow into and be stored in the cavity of the first recess 132, which is beneficial for supplying... Figure 1 The pump shaft 3 is lubricated, which further helps to reduce the friction between the pump shaft 3 and the first bushing 13; specifically, see Figure 5 and Figure 6a In this embodiment, the first bushing 13 includes three first recesses 132, which are evenly distributed along the circumference of the first bushing 13; of course, the number of first recesses 132 can also be one or more other numbers.

[0050] See Figures 6a to 8The first bushing 13 also includes a second recess 134, which is recessed inward from the upper end face 1311 of the first bushing 13. The second recess 134 communicates with the first recess 132. Along the axial direction of the first bushing 13, the second recess 134 is located near the end of the first recess 132. This arrangement of the second recess 134 facilitates the guidance of the working medium to the first recess 132. In this embodiment, the number of second recesses 134 is equal to the number of first recesses 132. Specifically, the first bushing 13 includes three second recesses 134, each of which is connected to a first recess 132.

[0051] See Figure 6b The first bushing 13 also includes a third recess 135, which is recessed inward from the lower end face 1312 of the first bushing 13. The third recess 135 communicates with the first recess 132. Along the axial direction of the first bushing 13, the third recess 135 is located near the other end of the first recess 132. This arrangement is beneficial for exporting the working medium located in the first recess 132. In this embodiment, the number of third recesses 135 is equal to the number of first recesses 132. Specifically, the first bushing 13 includes three third recesses 135, each of which is connected to a first recess 132.

[0052] See Figure 6a and Figure 6b The first bushing 13 also includes a first stepped surface 1313 and a second stepped surface 1314. The first stepped surface 1313 is located below the upper end surface 1311 of the first bushing 13, and the second stepped surface 1314 is located above the lower end surface 1312 of the first bushing. The outer contour of the first stepped surface 1313 is farther from the central axis of the first bushing 13 than the outer contour of the upper end surface 1312 of the first bushing, and the outer contour of the second stepped surface 1314 is farther from the central axis of the first bushing 13 than the outer contour of the lower end surface 1312 of the first bushing. By setting the first stepped surface 1313 and the second stepped surface 1314, the injection mold can be positioned with the first stepped surface as the guide during the injection molding process. 1313 and the second step surface 1314 serve as a positioning reference surface, allowing the upper end surface 1311 and the lower end surface 1312 of the first bushing to extend into the cavity of the injection mold. This ensures that the upper end surface 1311 and the lower end surface 1312 of the first bushing are isolated from the injected plastic during the injection process. This helps prevent plastic from forming on the upper end surface 1311 and the lower end surface 1312 of the first bushing during the injection process, and further helps prevent the plastic formed on the upper end surface 1311 and the lower end surface 1312 of the first bushing from falling off during the use of the electric pump, thus preventing contamination of the working medium.

[0053] See Figure 9 , Figure 9This is a schematic diagram of the second embodiment of the first bushing; the second embodiment of the first bushing will be described in detail below.

[0054] See Figure 9 In this embodiment, the first bushing 13' includes at least one limiting portion 131', which is recessed inward from the outer periphery of the first bushing 13' and extends circumferentially along the first bushing 13'. Specifically, in this embodiment, the limiting portion 131' extends a full circumference along the rotor assembly 13'. Of course, the limiting portion 131' can also be a portion extending circumferentially along the first bushing 13'. In this way, during the injection molding process, the first injection molded body 11 can fill the cavity of the limiting portion 131' with injection molding material, thereby helping to prevent the first bushing 13' from axially moving during the use of the rotor assembly. In this embodiment, the first bushing 13' includes two limiting portions 131', which are distributed at a distance set along the axial direction of the first bushing 13'. Of course, the number of limiting portions 131' can also be one or other, and can be adapted to the length of the first bushing.

[0055] See Figure 6a , Figure 6b and Figure 9 In the two embodiments of the first bushing described above, in order to prevent the first bushing from moving, a limiting part is provided on the first bushing. Alternatively, a knurled structure or a threaded structure can be provided on the outer circumferential surface of the first bushing to present a certain uneven rough structure. This allows the plastic in the first injection molded body to fill the uneven surface, which helps to improve the bonding force between the first bushing and the plastic part in the first injection molded body, thereby helping to prevent the first bushing from moving.

[0056] The rotor in the rotor assembly of the first embodiment will be described in detail below.

[0057] See Figure 10 , Figure 10 This is a schematic diagram of the rotor in the rotor assembly in the first embodiment; the structure of the rotor in the rotor assembly in the first embodiment will be described in detail below.

[0058] See Figure 10 and Figure 11 In this embodiment, the rotor 14 includes a rotor core 141 and a permanent magnet 142, as detailed in the reference [reference needed]. Figure 4 and Figure 5The rotor core 141 is fixed to the first bushing 13 by injection molding, and the permanent magnet 142 is fixed to the rotor core 141 by injection molding. The wrapping layer of the second injection molded body 12 wraps the outer surface of the permanent magnet 142 and forms a sealed structure that isolates the permanent magnet 142 from the outside of the rotor assembly. This helps to form an isolation layer between the permanent magnet 141 and the working medium, thereby preventing the permanent magnet 142 from being corroded by the working medium and thus improving the service life of the rotor assembly.

[0059] See Figures 10 to 12 In this embodiment, the rotor core 141 includes stacked and riveted silicon steel sheets; the rotor core 141 includes a mounting portion 1411, which is recessed from the outer periphery of the rotor core 14 towards the inner side of the rotor core 14. A permanent magnet 142 is partially located in the mounting portion 1411, and the inner periphery of the permanent magnet 142 is fitted against one side of the mounting portion 1411, thus allowing the permanent magnet 142 to be positioned in the circumferential direction of the rotor. In this embodiment, the permanent magnet 142 has a segmented structure. Specifically, the rotor 14 includes four permanent magnets 142, and the rotor core 141 includes four mounting portions 1411, the number of mounting portions 1411 corresponding to the number of permanent magnets 142. See also... Figure 10 and Figure 12 The inner and outer circumferential surfaces of the permanent magnet 142 are arc-shaped. A cross-section of the rotor is obtained by taking a plane perpendicular to the axis of the rotor assembly. On the cross-section of the rotor, the center O1 of the outer circumferential surface of the permanent magnet 142 coincides with the central axis of the rotor core 141, and the center O2 of the inner circumferential surface of the permanent magnet 142 is offset from the central axis of the rotor core 141. In other words, the center O2 of the inner circumferential surface of the permanent magnet 142 is offset from the center O1 of the outer circumferential surface of the permanent magnet.

[0060] See Figure 13 The connecting part 16 includes a ring part 161 and a positioning part 162. The ring part 161 is arranged around one end of the first bushing 162. One end of the positioning part 162 is connected to the inner circumferential surface of the ring part 161, and the other end of the positioning part 162 is connected to the outer circumferential surface of the ring part 161. The positioning part 162 protrudes from the bottom surface of the ring part 161. After the rotor assembly is manufactured, it is necessary to place the rotor assembly into a magnetizing fixture to magnetize the rotor assembly. The placement direction of the rotor assembly will affect the magnetization direction of the rotor assembly. By setting the positioning part 162, it can serve as a fault-prevention feature when placing the rotor assembly, providing a reference for the placement direction of the rotor assembly, which is beneficial to the magnetization of the rotor assembly.

[0061] See Figure 12 and Figure 13In this embodiment, a portion of the outer peripheral surface of the first bushing 13 forms the inner peripheral surface of the ring 161. Two positioning portions 162 are symmetrically distributed about the central axis of the first bushing 13, and the central symmetry plane of the positioning portion 162 coincides with the central symmetry plane of one of the permanent magnets 142. The "coincidence" mentioned above refers to theoretical coincidence, but in actual manufacturing, there may be deviations. All coincidence errors caused by manufacturing are within the protection scope of this application. In this embodiment, since the center O1 of the outer peripheral surface of the permanent magnet 142 coincides with the central axis of the rotor core, and the center O2 of the inner peripheral surface of the permanent magnet 142 is offset from the central axis of the rotor core 142, when the first injection molded body 11 is injection molded, the outer peripheral surface of the permanent magnet 142 can be used as one of the positioning surfaces. This provides a reference for the placement direction of the rotor when the rotor 14 is placed in the mold, thereby enabling the central symmetry plane of the positioning portion 162 to coincide with the central symmetry plane of the permanent magnet 142, which is beneficial for matching the magnetization direction of the rotor assembly.

[0062] See Figure 14 and Figure 15 , Figure 14 and Figure 15 This is a schematic diagram of the second embodiment of the rotor assembly; the second embodiment of the rotor assembly will be described in detail below.

[0063] See Figure 14 and Figure 15 In this embodiment, the rotor 14a is annular and includes an injection-molded body formed by injection molding of plastic material and magnetic material mixed in a certain proportion. The second injection-molded body 1a wraps the outer surface of the rotor 14a and forms a sealed structure that isolates the rotor 14a from the outside of the rotor assembly. In this way, during the use of the electric pump, the rotor 14a can form an isolation layer with the working medium, which helps to prevent the rotor 14a from being corroded by the working medium, thereby improving the service life of the rotor assembly.

[0064] Compared to the first embodiment of the rotor assembly, in this embodiment, the rotor 14a is annular and comprises an injection-molded body formed by injection molding of plastic material and magnetic material mixed in a certain proportion. Compared to the first embodiment of the rotor assembly, the rotor structure in this embodiment is simpler.

[0065] The manufacturing methods of the rotor assembly in the first and second embodiments will be described in detail below.

[0066] See Figures 2 to 16 The manufacturing method of rotor assembly 1 includes the following steps:

[0067] S1 includes the forming of the first bushing 13 and the rotor 14;

[0068] S2, the first injection molded body 11 is formed by injection molding using the rotor 14 and the first bushing 13 as injection molding inserts;

[0069] S3, a second injection body 12 is formed by injection molding using the first injection body 11 as an injection insert; the second injection body 12 includes a wrapping layer 122, which wraps at least part of the outer peripheral surface of the first injection body 11; the second injection body 12 includes a lower cover plate 121 and a blade 15, which are integrally injection molded.

[0070] The above manufacturing method allows the first bushing to be fixed by injection molding, which helps to reduce the strength requirements of the first bushing material, thereby reducing the manufacturing cost of the first bushing and thus reducing the manufacturing cost of the rotor assembly.

[0071] The forming of the first bushing includes the following steps:

[0072] S11, at least one limiting part 131 is formed on the first bushing 13. The limiting part 131 is provided to protrude from the outer peripheral surface of the body of the first bushing 13. Along the axial direction of the first bushing 13, the axial height of the limiting part 131 is less than the axial height of the body of the first bushing 13. In this embodiment, the limiting part is protruding. Of course, the limiting part can also be concave. In this case, the limiting part is recessed from the outer peripheral surface of the first bushing and extends along the circumferential direction of the first bushing.

[0073] S12, a first hole 133 and at least one first recess 132 are formed on the first bushing 13. The first hole 133 extends through the first bushing 13 axially, and the first recess 132 extends along the axial direction of the first hole 133. Along the radial direction of the first bushing 13, the first recess 132 is recessed from the inner circumferential surface of the first hole 133.

[0074] S13, at least one second recess 134 is formed on the first bushing 13, the second recess 134 communicates with the first recess 132, the second recess 134 is recessed from the upper end face of the first bushing 13 along the axial direction of the first bushing 13, and the second recess 134 is located near one end of the first recess 132;

[0075] S14, at least one third recess 135 is formed on the first bushing 13, the third recess 135 communicates with the first recess 134, the third recess 135 is recessed from the lower end face of the first bushing 13 along the axial direction of the first bushing 13, and the third recess 135 is located near the other end of the first recess 132;

[0076] S15, a first step surface 1313 and a second step surface 1314 are formed on the first bushing 13. The first step surface 1313 is lower than the upper end surface 1311 of the first bushing 13, and the second step surface 1314 is higher than the lower end surface 1312 of the first bushing. The first step surface 1313 is located above the second step surface 1314. The outer contour of the first step surface 1313 is farther from the central axis of the first bushing 13 than the outer contour of the upper end surface 1312 of the first bushing. The outer contour of the second step surface 1314 is farther from the central axis of the first bushing 13 than the outer contour of the lower end surface 1312 of the first bushing.

[0077] The manufacturing of the rotor includes the following steps:

[0078] S16, the rotor 14 includes a rotor core 141 and a permanent magnet 142. The rotor 14 is manufactured by assembling the rotor core 141 and the permanent magnet 142. Specifically, the rotor core 141 is manufactured by stacking and riveting silicon steel sheets. Referring to the figure, the rotor core 141 includes a mounting portion 1411, which is concave. The assembly of the rotor core 141 and the permanent magnet 1442 includes the following steps: placing the permanent magnet 142 in the mounting portion 1411; when the permanent magnet 142 is placed in the mounting portion 1411, the inner circumferential surface of the permanent magnet 142 is fitted against one side of the mounting portion 1411, and the mounting portion 1411 enables the permanent magnet 142 to be positioned in the circumferential direction of the rotor.

[0079] Of course, the rotor can also be manufactured using the following steps:

[0080] S16' and rotor 14' are injection molded bodies formed by injection molding, and the injection molding material includes magnetic materials and plastic materials mixed in a certain proportion and injection molded.

[0081] It should be noted that the above steps S11-S16 do not have a specific order; they can be performed simultaneously or in reverse order. In addition, in this embodiment, the manufacturing method of the first bushing includes steps S11-S15. Of course, the manufacturing method of the first bushing may also include only any one or more of steps S11-S15.

[0082] See Figure 17 , Figure 17 This is a schematic diagram of the third embodiment of the rotor assembly. The third embodiment of the rotor assembly will be described in detail below.

[0083] See Figure 17In this embodiment, the rotor assembly 1b includes a first bushing 13b and a second bushing 16b. The second bushing 16b is positioned closer to the impeller than the first bushing 13b. In this embodiment, the first injection-molded body 11b includes a rotor 14, the first bushing 13b, and a connecting portion 16b. The connecting portion 16b connects the first bushing 13b and the rotor 14. The connecting portion 16b is made of plastic. The first injection-molded body 11b is formed by injection molding using the first bushing 13b and the rotor 14 as inserts. In this embodiment, the second injection-molded body 12b is formed by injection molding using the first injection-molded body 11b and the second bushing 16b as inserts. The second injection-molded body 12b includes a lower cover plate 121b and a wrapping layer 122b. The wrapping layer 122b wraps a portion of the outer peripheral surface of the first injection-molded body 11b. In this embodiment, the rotor assembly 1 also includes blades 15. Along the axial direction of the rotor assembly 1, the lower cover plate 121 is closer to the rotor 14 than the blades 15. In this embodiment, the blades 15 and the lower cover plate 121b are positioned closer to the rotor 14. 1b is an integral structure. Here, "integrated structure" means that the blade 15 and the lower cover plate 121b are formed integrally by injection molding. Of course, the blade 15 and the lower cover plate 121b can also be set separately. Specifically, refer to the fourth and fifth embodiments of the rotor assembly, which will not be elaborated here. Through the above structure, the first bushing 13b and the second bushing 16b are fixed by injection molding. This helps to reduce the strength requirements of the material of the first bushing 13b, the material of the connection between the first bushing 13b and the rotor assembly, the material of the second bushing 16b, and the material of the connection between the second bushing 16b and the rotor assembly. This helps to reduce the manufacturing cost of the materials of the first bushing 13b, the connection between the first bushing 13b and the rotor assembly, the second bushing 16b, and the connection between the second bushing 16b and the rotor assembly, thereby helping to reduce the manufacturing cost of the rotor assembly.

[0084] See Figure 17 The first bushing 13b includes a first hole 133b extending axially along the first bushing 13b. The second bushing 16b includes a second hole 161b extending axially along the second bushing 16b. The central axis of the first hole 133b and the central axis of the second hole 161b are coaxially arranged. Here, "coaxial" refers to theoretical coaxiality. However, in actual manufacturing, there may be manufacturing errors. Therefore, all coaxiality deviations caused by manufacturing errors are within the protection scope of this application.

[0085] See Figure 17In this embodiment, the connecting portion 16b includes a third hole portion 113b, which extends axially along the connecting portion 16b; a first bushing 13b is disposed near one end of the third hole portion 113b, and a second bushing 16b is disposed near the other end of the third hole portion 113b; the diameter of the first hole portion 133b is smaller than the diameter of the third hole portion 113b, and the diameter of the second hole portion 161b is smaller than the diameter of the third hole portion 113b; in this embodiment, when the first injection molded body 11b is formed by injection molding with the first bushing 13b and the rotor 14 as inserts, the first... The inner circumferential surface of bushing 13b serves as a positioning surface. The mold mandrel mates with the inner circumferential surface of the first bushing 13b. When the second injection molded body 12b is formed by injection molding using the first injection molded body 11b and the second bushing 16b as inserts, the inner circumferential surface of the second bushing 16b can be used as a positioning surface to mate the mold mandrel with the inner circumferential surface of the second bushing 16b. Compared to the first embodiment of the rotor assembly, this approach is advantageous in two ways: firstly, it reduces the mating area between the mold mandrel and the bushing, thus facilitating demolding; secondly, it reduces the material usage of the bushing, thereby lowering costs. (See also...) Figure 17 The outer edge dimensions of the first bushing 13b and the second bushing 16b are both larger than the diameter of the third hole 113b. In this embodiment, the outer edge dimensions of the first bushing 13b and the second bushing 16b refer to the outer circumferential dimensions of the limiting part. In addition, the rotor structure in this embodiment can refer to the rotor structure in the first embodiment of the rotor assembly. Of course, the rotor structure in this embodiment can also refer to the rotor structure in the second embodiment of the rotor assembly, which will not be described in detail here.

[0086] The manufacturing method of the rotor assembly in the third embodiment will be described in detail below.

[0087] See Figure 18 The method for manufacturing rotor assembly 1b includes the following steps:

[0088] S1 includes the forming of a first bushing 13b, a second bushing 16b, and rotors (14, 14'); the manufacturing methods of the first bushing 16b and rotors (14, 14') can be referred to the manufacturing methods of the first bushing and rotor in the first and second embodiments of the rotor assembly, and the manufacturing method of the second bushing 16b can be referred to the manufacturing method of the first bushing 13b, which will not be described in detail here;

[0089] S2, the first injection molded body 11b is formed by injection molding using the rotor (14, 14') and the first bushing 13b as injection molding inserts;

[0090] S3, a second injection molded body 12b is formed by injection molding using the first injection molded body 11b and the second bushing 16b as injection molding inserts; the second injection molded body 12b includes a wrapping layer 122b, which wraps at least a portion of the outer peripheral surface of the first injection molded body 11b; the second injection molded body 12b includes a lower cover plate 121b and a blade 15b, which are formed into an integral structure by injection molding. Specifically, in this embodiment, during the injection molding of the second injection body, the first hole of the first bushing 13b and the first hole of the second bushing 16b are used as a positioning reference surface of the mold. The mold extends into the cavity of the first hole of the first bushing 13b and the cavity of the first hole of the second bushing 16b. The mold is configured to cooperate with the side wall of the first hole of the first bushing 13b and the side wall of the first hole of the second bushing 16b. In this way, by using the first hole of the first bushing 13b and the first hole of the second bushing 16b as a positioning reference surface of the mold, it is beneficial to improve the coaxiality accuracy between the first bushing 13b and the second bushing 16b.

[0091] The above manufacturing method allows the first bushing 13b and the second bushing 16b to be fixed by injection molding. This helps to reduce the strength requirements of the materials of the first bushing 13b, the connection between the first bushing 13b and the rotor assembly, the second bushing 16b, and the connection between the second bushing 16b and the rotor assembly. This, in turn, helps to reduce the manufacturing cost of the materials of the first bushing 13b, the connection between the first bushing 13b and the rotor assembly, the second bushing 16b, and the connection between the second bushing 16b and the rotor assembly, thereby reducing the manufacturing cost of the rotor assembly.

[0092] See Figure 19 , Figure 19 This is a schematic diagram of the fourth embodiment of the rotor assembly. The fourth embodiment of the rotor assembly will be described in detail below.

[0093] See Figure 19The rotor assembly 1c also includes an upper cover plate 17c and blades 15c. Part of the blades 15c is located between the upper cover plate 17c and the lower cover plate 121c, with the upper cover plate 17c located above the lower cover plate 121c. In this embodiment, the upper cover plate 17c and the blades 15c are integrally injection molded. Of course, the upper cover plate 17c and the blades 15c can also be separately arranged, specifically in the following two cases: one case is that the upper cover plate 17c and the blades 15c are formed separately, with the upper end of the blades 15c fixedly connected to the upper cover plate 17c and the lower end of the blades 15c fixedly connected to the lower cover plate 121c; the other case is that the upper cover plate 17c is formed separately, while the blades 15c and the lower cover plate 121c are integrally formed. In this embodiment, the structure of rotor 14 of rotor assembly 1c is the same as that of rotor in the first embodiment of rotor assembly. Of course, the structure of rotor 14 of rotor assembly 1c in this embodiment can also refer to the rotor structure in the second embodiment of rotor assembly. In this embodiment, other structural features of rotor assembly can refer to the first embodiment of rotor assembly, and will not be described in detail here.

[0094] The manufacturing method of the rotor assembly in the fourth embodiment will be described in detail below.

[0095] See Figure 19 and Figure 20 The method for manufacturing rotor assembly 1c includes the following steps:

[0096] S1 includes the forming of a first bushing 13, rotors (14, 14'), and an integrally structured upper cover plate 17c and blades 15c; the integrally structured upper cover plate 17c and blades 15c are formed by injection molding. The manufacturing method of the first bushing 16c and rotors (14, 14') can be referred to the manufacturing method of the first bushing and rotor in the first embodiment of the rotor assembly. Of course, the rotor manufacturing method in this embodiment can also refer to the rotor manufacturing method in the second embodiment of the rotor assembly, which will not be described in detail here.

[0097] S2, the first injection molded body 11c is formed by injection molding using the rotor (14, 14') and the first bushing 13 as injection molding inserts;

[0098] S4, a second injection molded body 12c is formed by injection molding using the first injection molded body 11c as an injection molding insert; the second injection molded body 12c includes a wrapping layer 122c and a lower cover plate 17c, the wrapping layer 122c wraps at least part of the outer peripheral surface of the first injection molded body 11c; the rotor assembly 11c also includes blades 15c and an upper cover plate 17c, the blades 15c and the upper cover plate 17c are an integral structure, and the lower end of the blades 15c is fixedly connected to the lower cover plate 121c by welding.

[0099] Of course, when the top cover 17c and the blade 15c can also be set separately, step S4 will become the following two different steps depending on the two different situations of separate setting.

[0100] When the blade 15c and the lower cover plate 121c are integrally formed, step S4 will become step S5. In S5, the first injection molded body 11c is used as an injection molding insert to form the second injection molded body. At this time, the structure of the second injection molded body can refer to the structure of the first or second embodiment of the rotor assembly. The second injection molded body includes a wrapping layer that wraps at least part of the outer peripheral surface of the first injection molded body 11c. The second injection molded body also includes the lower cover plate 121c and the blade 15c. The upper end of the blade 15c is fixedly connected to the upper cover plate 17c by welding. The forming of the upper cover plate 17c is completed in step S1.

[0101] When the upper cover plate 17c and the blade 15c are formed separately, step S4 will become step S6. In S6, the first injection molded body 11c is used as an injection molding insert to form the second injection molded body through injection molding. The second injection molded body includes a wrapping layer that wraps at least part of the outer peripheral surface of the first injection molded body 11c. The second injection molded body includes a lower cover plate 121c. The upper end of the blade 15c is fixedly connected to the upper cover plate 17c by welding, and the lower end of the blade 15c is fixedly connected to the lower cover plate 121c by welding. The forming of the blade 15c and the upper cover plate 17c is completed in step S1.

[0102] By using the above manufacturing method, the first bushing 13 is fixed by injection molding, which helps to reduce the strength requirements of the material of the first bushing 13 and the rotor assembly connected to the first bushing 13 in the rotor assembly, thereby reducing the material cost of the first bushing 13 and the connection between the first bushing 13 and the rotor assembly, and thus reducing the manufacturing cost of the rotor assembly.

[0103] See Figure 21 , Figure 21 This is a schematic diagram of the fifth embodiment of the rotor assembly. The structure of the fifth embodiment of the rotor assembly will be described in detail below.

[0104] See Figure 21The rotor assembly 1d also includes an upper cover plate 17d and blades 15d. Blades 15d are located between the upper cover plate 17d and the lower cover plate 121d, with the upper cover plate 17d positioned above the lower cover plate 121d. In this embodiment, the upper cover plate 17d and blades 15d are integrally injection molded. However, the upper cover plate 17d and blades 15d can also be separate components, specifically in two ways: one is that the upper cover plate 17d and blades 15d are formed separately, with the upper end of blades 15d fixedly connected to the upper cover plate 17d and the lower end of blades 15d fixedly connected to the lower cover plate 121d; the other is that the upper cover plate 17d is formed separately, while blades 15d and the lower cover plate 121d are integrally formed. The rotor structure of the rotor assembly in this embodiment is the same as the rotor structure in the first embodiment of the rotor assembly. Of course, the rotor structure of the rotor assembly can also refer to the rotor structure in the second embodiment of the rotor assembly. The main difference between the rotor assembly in this embodiment and the fourth embodiment is that the rotor assembly 1d includes a first bushing 13d and a second bushing 16d. The relevant structures can be referred to in the third embodiment, and will not be described in detail here.

[0105] The manufacturing method of the rotor assembly in the fifth embodiment will be described in detail below.

[0106] See Figure 21 and Figure 22 The manufacturing method of rotor assembly 1d includes the following steps:

[0107] S1 includes the forming of a first bushing 13d, a second bushing 16d, and rotors (14, 14'); the manufacturing methods of the first bushing 13d and rotors (14, 14') can be referred to the manufacturing methods of the first bushing and rotor in the first and second embodiments of the rotor assembly, and the manufacturing method of the second bushing 16d can be referred to the manufacturing method of the first bushing, which will not be described in detail here;

[0108] S2, the first injection molded body 11d is formed by injection molding using the rotor (14, 14') and the first bushing 13d as injection molding inserts;

[0109] S4, a second injection molded body 12d is formed by injection molding using the first injection molded body 11d and the second bushing 16d as injection molding inserts; the second injection molded body 12d includes a wrapping layer 122d, which wraps at least part of the outer peripheral surface of the first injection molded body 11d; the rotor assembly 1d also includes a blade 15d and an upper cover plate 17d, the blade 15d and the upper cover plate 17d are an integral structure, and the lower end of the blade 15d is fixedly connected to the lower cover plate 121d by welding.

[0110] Of course, when the top cover plate 17d and the blade 15d can also be set separately, step S4 will become the following two different steps for the two different cases of separate setting.

[0111] When the blade 15d and the lower cover plate 121d are integrally formed, step S4 will become step S5. In S5, the first injection molded body 11d is used as an injection molding insert to form the second injection molded body. At this time, the structure of the second injection molded body can refer to the structure of the first or second embodiment of the rotor assembly. The second injection molded body includes a wrapping layer that wraps at least part of the outer peripheral surface of the first injection molded body 11d. The second injection molded body includes the lower cover plate 121d and the blade 15d. The upper end of the blade 15d is fixedly connected to the upper cover plate 17d by welding. The forming of the upper cover plate 17d is completed in step S1.

[0112] When the upper cover plate 17d and the blade 15d are formed separately, step S4 will become step S6. In S6, the first injection molded body 11d is used as an injection molding insert to form the second injection molded body. The second injection molded body includes a wrapping layer that wraps at least part of the outer peripheral surface of the first injection molded body 11d. The second injection molded body includes a lower cover plate 121d. The upper end of the blade 15d is fixedly connected to the upper cover plate 17d by welding, and the lower end of the blade 15d is fixedly connected to the lower cover plate 121d by welding. The forming of the blade 15d and the upper cover plate 17d is completed in step S1.

[0113] The above manufacturing method allows the first bushing 13d and the second bushing 16d to be fixed by injection molding. This helps to reduce the strength requirements of the materials of the first bushing 13d, the connection between the first bushing 13d and the rotor assembly, the second bushing 16d, and the connection between the second bushing 16d and the rotor assembly. This, in turn, helps to reduce the manufacturing cost of the materials of the first bushing 13d, the connection between the first bushing 13d and the rotor assembly, the second bushing 16d, and the connection between the second bushing 16d and the rotor assembly, thereby reducing the manufacturing cost of the rotor assembly.

[0114] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A method for manufacturing a rotor assembly, characterized in that: The rotor assembly includes a rotor and a first shaft sleeve; the method for manufacturing the rotor assembly includes the following steps: S1, the forming of the first bushing and the rotor, the forming of the first bushing further includes forming a first stepped surface on the first bushing, the first stepped surface being located below the upper end surface of the first bushing, and the outer contour of the first stepped surface being farther from the central axis of the first bushing than the outer contour of the upper end surface of the first bushing. S2, the rotor and the first bushing are used as injection molding inserts to form a first injection molded body. When the first injection molded body is injected, the first step surface is used as a positioning reference surface of the mold. The upper end surface of the first bushing extends into the cavity of the mold. The upper end surface of the first bushing is isolated from the injected plastic by extending into the cavity of the mold. The method for manufacturing the rotor assembly further includes any one of the following steps S3 to S6: S3, at least the first injection molded body is used as an injection molding insert to form a second injection molded body; the second injection molded body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection molded body; the second injection molded body includes a lower cover plate and a blade, the lower cover plate and the blade being an integral injection molded structure; S4, at least the first injection molded body is used as an injection molding insert to form a second injection molded body; the second injection molded body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection molded body; the second injection molded body includes a lower cover plate, and the rotor assembly also includes blades and an upper cover plate, the blades and the upper cover plate being an integral structure, the lower end of the blades being fixedly connected to the lower cover plate by welding; step S1 also includes the forming of the blades and the upper cover plate; S5, at least the first injection body is used as an injection insert to form a second injection body by injection molding; the second injection body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection body; the second injection body includes a lower cover plate and blades, the rotor assembly also includes an upper cover plate, the upper end of the blades is fixedly connected to the upper cover plate by welding, and step S1 also includes the forming of the upper cover plate; S6, at least the first injection molded body is used as an injection molding insert to form a second injection molded body; the second injection molded body includes a wrapping layer that wraps at least a portion of the outer peripheral surface of the first injection molded body; the second injection molded body includes a lower cover plate, the rotor assembly also includes blades and an upper cover plate, the upper end of the blades is fixedly connected to the upper cover plate by welding, the lower end of the blades is fixedly connected to the lower cover plate by welding, and step S1 also includes the forming of the blades and the upper cover plate.

2. The manufacturing method according to claim 1, characterized in that: The rotor assembly further includes a second bushing, and step S1 further includes forming the second bushing; in steps S3 to S6, the second injection molded body is formed by injection molding using the second bushing and the first injection molded body as injection molding inserts.

3. The manufacturing method according to claim 2, characterized in that: The forming of the first bushing includes forming a hole in the first bushing, the hole in the first bushing extending along the axial direction of the first bushing; the forming of the second bushing includes forming a hole in the second bushing, the hole in the second bushing extending along the axial direction of the second bushing. During the injection molding of the second injection body, the hole portion of the first bushing and the hole portion of the second bushing are used as a positioning reference surface of the mold. The mold extends into the cavity of the hole portion of the first bushing and the cavity of the hole portion of the second bushing. The mold is configured to cooperate with the side wall of the hole portion of the first bushing and the side wall of the hole portion of the second bushing.

4. The manufacturing method according to any one of claims 1 to 3, characterized in that: In step S1, the forming of the first bushing includes forming at least one limiting portion on the first bushing. The limiting portion protrudes from the outer peripheral surface of the first bushing and extends along the axial direction of the first bushing. The length of the limiting portion is less than the length of the first bushing. When the first injection molding body is injection molded, the injected plastic surrounds the limiting portion, so that the first bushing is limited in both the circumferential and axial directions.

5. The manufacturing method according to any one of claims 1 to 3, characterized in that: In step S1, the forming of the first bushing includes forming at least one limiting portion on the first bushing. The limiting portion is recessed from the outer peripheral surface of the first bushing and extends along the circumferential direction of the first bushing. When the first injection molded body is injected, the injected plastic fills the limiting portion, so that the first bushing is limited in the axial direction.

6. The manufacturing method according to claim 4, characterized in that: In step S1, the forming of the first bushing further includes forming a second stepped surface on the first bushing. The second stepped surface is located above the lower end face of the first bushing, and the first stepped surface is located above the second stepped surface. The outer contour of the second stepped surface is farther from the central axis of the first bushing than the outer contour of the lower end face of the first bushing. During the injection molding of the first injection molded body, the second stepped surface is used as a positioning reference surface of the mold. The lower end face of the first bushing extends into the cavity of the mold. The lower end face of the first bushing is isolated from the injected plastic by extending into the cavity of the mold.

7. The manufacturing method according to claim 5, characterized in that: In step S1, the forming of the first bushing further includes forming a second stepped surface on the first bushing. The second stepped surface is located above the lower end face of the first bushing, and the first stepped surface is located above the second stepped surface. The outer contour of the second stepped surface is farther from the central axis of the first bushing than the outer contour of the lower end face of the first bushing. During the injection molding of the first injection molded body, the second stepped surface is used as a positioning reference surface of the mold. The lower end face of the first bushing extends into the cavity of the mold. The lower end face of the first bushing is isolated from the injected plastic by extending into the cavity of the mold.

8. The manufacturing method according to any one of claims 1 to 3, characterized in that: In step S1, the rotor is an injection-molded body formed by injection molding, and the injection molding material includes a material that is a mixture of magnetic material and plastic material in a certain proportion.

9. The manufacturing method according to claim 4, characterized in that: In step S1, the rotor is an injection-molded body formed by injection molding, and the injection molding material includes a material that is a mixture of magnetic material and plastic material in a certain proportion.

10. The manufacturing method according to claim 5, characterized in that: In step S1, the rotor is an injection-molded body formed by injection molding, and the injection molding material includes a material that is a mixture of magnetic material and plastic material in a certain proportion.

11. The manufacturing method according to claim 6, characterized in that: In step S1, the rotor is an injection-molded body formed by injection molding, and the injection molding material includes a material that is a mixture of magnetic material and plastic material in a certain proportion.

12. The manufacturing method according to claim 7, characterized in that: In step S1, the rotor is an injection-molded body formed by injection molding, and the injection molding material includes a material that is a mixture of magnetic material and plastic material in a certain proportion.

13. The manufacturing method according to any one of claims 1 to 3, characterized in that: In step S1, the rotor includes a rotor core and a permanent magnet, and the manufacturing of the rotor includes the assembly of the rotor core and the permanent magnet.

14. The manufacturing method according to claim 4, characterized in that: In step S1, the rotor includes a rotor core and a permanent magnet, and the manufacturing of the rotor includes the assembly of the rotor core and the permanent magnet.

15. The manufacturing method according to claim 5, characterized in that: In step S1, the rotor includes a rotor core and a permanent magnet, and the manufacturing of the rotor includes the assembly of the rotor core and the permanent magnet.

16. The manufacturing method according to claim 6, characterized in that: In step S1, the rotor includes a rotor core and a permanent magnet, and the manufacturing of the rotor includes the assembly of the rotor core and the permanent magnet.

17. The manufacturing method according to claim 7, characterized in that: In step S1, the rotor includes a rotor core and a permanent magnet, and the manufacturing of the rotor includes the assembly of the rotor core and the permanent magnet.

18. The manufacturing method according to claim 13, characterized in that: The rotor core is manufactured by stacking and riveting silicon steel sheets together. The rotor core includes a mounting portion that is concave. The assembly of the rotor core and the permanent magnet includes the following steps: placing the permanent magnet in the mounting portion; when the permanent magnet is placed in the mounting portion, the inner circumferential surface of the permanent magnet is fitted against one side of the mounting portion, and the mounting portion enables the permanent magnet to be positioned at the upper limit in the circumferential direction of the rotor.

19. The manufacturing method according to claim 14, characterized in that: The rotor core is manufactured by stacking and riveting silicon steel sheets together. The rotor core includes a mounting portion that is concave. The assembly of the rotor core and the permanent magnet includes the following steps: placing the permanent magnet in the mounting portion; when the permanent magnet is placed in the mounting portion, the inner circumferential surface of the permanent magnet is fitted against one side of the mounting portion, and the mounting portion enables the permanent magnet to be positioned at the upper limit in the circumferential direction of the rotor.

20. The manufacturing method according to claim 15, characterized in that: The rotor core is manufactured by stacking and riveting silicon steel sheets together. The rotor core includes a mounting portion that is concave. The assembly of the rotor core and the permanent magnet includes the following steps: placing the permanent magnet in the mounting portion; when the permanent magnet is placed in the mounting portion, the inner circumferential surface of the permanent magnet is fitted against one side of the mounting portion, and the mounting portion enables the permanent magnet to be positioned at the upper limit in the circumferential direction of the rotor.

21. The manufacturing method according to claim 16, characterized in that: The rotor core is manufactured by stacking and riveting silicon steel sheets together. The rotor core includes a mounting portion that is concave. The assembly of the rotor core and the permanent magnet includes the following steps: placing the permanent magnet in the mounting portion; when the permanent magnet is placed in the mounting portion, the inner circumferential surface of the permanent magnet is fitted against one side of the mounting portion, and the mounting portion enables the permanent magnet to be positioned at the upper limit in the circumferential direction of the rotor.

22. The manufacturing method according to claim 17, characterized in that: The rotor core is manufactured by stacking and riveting silicon steel sheets together. The rotor core includes a mounting portion that is concave. The assembly of the rotor core and the permanent magnet includes the following steps: placing the permanent magnet in the mounting portion; when the permanent magnet is placed in the mounting portion, the inner circumferential surface of the permanent magnet is fitted against one side of the mounting portion, and the mounting portion enables the permanent magnet to be positioned at the upper limit in the circumferential direction of the rotor.

23. The manufacturing method according to claim 18, characterized in that: The inner and outer circumferential surfaces of the permanent magnet are arc-shaped. The center of the outer circumferential surface of the permanent magnet is offset from the central axis of the rotor core, and the center of the inner circumferential surface of the permanent magnet is concentric with the center of the rotor core. During the injection molding of the first injection molded body, the outer circumferential surface of the permanent magnet is used as a positioning reference surface of the mold, so that when the rotor is placed into the mold, a reference reference can be provided for the placement direction of the rotor.

24. The manufacturing method according to claim 19, characterized in that: The inner and outer circumferential surfaces of the permanent magnet are arc-shaped. The center of the outer circumferential surface of the permanent magnet is offset from the central axis of the rotor core, and the center of the inner circumferential surface of the permanent magnet is concentric with the center of the rotor core. During the injection molding of the first injection molded body, the outer circumferential surface of the permanent magnet is used as a positioning reference surface of the mold, so that when the rotor is placed into the mold, a reference reference can be provided for the placement direction of the rotor.

25. The manufacturing method according to claim 20, characterized in that: The inner and outer circumferential surfaces of the permanent magnet are arc-shaped. The center of the outer circumferential surface of the permanent magnet is offset from the central axis of the rotor core, and the center of the inner circumferential surface of the permanent magnet is concentric with the center of the rotor core. During the injection molding of the first injection molded body, the outer circumferential surface of the permanent magnet is used as a positioning reference surface of the mold, so that when the rotor is placed into the mold, a reference reference can be provided for the placement direction of the rotor.

26. The manufacturing method according to claim 21, characterized in that: The inner and outer circumferential surfaces of the permanent magnet are arc-shaped. The center of the outer circumferential surface of the permanent magnet is offset from the central axis of the rotor core, and the center of the inner circumferential surface of the permanent magnet is concentric with the center of the rotor core. During the injection molding of the first injection molded body, the outer circumferential surface of the permanent magnet is used as a positioning reference surface of the mold, so that when the rotor is placed into the mold, a reference reference can be provided for the placement direction of the rotor.

27. The manufacturing method according to claim 22, characterized in that: The inner and outer circumferential surfaces of the permanent magnet are arc-shaped. The center of the outer circumferential surface of the permanent magnet is offset from the central axis of the rotor core, and the center of the inner circumferential surface of the permanent magnet is concentric with the center of the rotor core. During the injection molding of the first injection molded body, the outer circumferential surface of the permanent magnet is used as a positioning reference surface of the mold, so that when the rotor is placed into the mold, a reference reference can be provided for the placement direction of the rotor.

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