A method of assembling a high speed motor

Abstract

The application discloses a high-speed motor assembling method, which comprises the following steps: firstly, a first bearing is installed into an upper casing assembly, and then a stator assembly is installed into the upper casing assembly to form a first pre-assembled assembly; secondly, a rotor and a fan are respectively assembled onto a driving shaft to form a second pre-assembled assembly; thirdly, the front end of the driving shaft of the second pre-assembled assembly is installed into a bearing seat of the first pre-assembled assembly, and the rotor is assembled into the stator assembly; fourthly, a second bearing is installed at the rear end of the driving shaft of the second pre-assembled assembly, and then a lower casing assembly is assembled to the second pre-assembled assembly, and the lower casing assembly is butted against the upper casing assembly; and fifthly, a pre-pressing spring is abutted against the second bearing, and the pre-pressing spring generates a pre-pressing force on the second bearing in the direction of the first bearing. The high-speed motor assembling method provided by the application arranges the pre-pressing spring on one side of the driving shaft, and arranges the fan at the rear end to realize negative pressure air suction, thereby reducing the airflow hysteresis effect when the rotor rotates at a high speed.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and in particular to an assembly method for a high-speed electric motor. Background Technology

[0002] Existing hair dryer motors use a double-bearing structure with a spring in the middle. During operation, the fan's rotation, whether blowing or drawing air, exerts an axial force on the drive shaft. Because the spring is located between the two bearings, the spring forces acting on each bearing are opposite. One bearing experiences the force in the same direction as the force exerted on the drive shaft by the fan, while the other bearing experiences the force in the opposite direction. Furthermore, as the fan speed changes, the magnitude of the force exerted on the drive shaft also varies between zero and extreme values, causing axial movement of the drive shaft. This results in vibration and instability in the motor's operation. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a method for assembling a high-speed motor, thereby solving the problem of axial movement of the drive shaft during the motor assembly process.

[0004] To solve the above-mentioned technical problems, the present invention provides an assembly method for a high-speed motor, comprising:

[0005] The upper housing assembly, the first bearing, and the stator assembly are provided respectively.

[0006] The first bearing is installed into the upper housing assembly, and then the stator assembly is installed into the upper housing assembly to form the first pre-assembled assembly;

[0007] The rotor, drive shaft, and fan are provided separately.

[0008] The rotor and the fan are respectively assembled onto the drive shaft to form a second pre-assembled assembly;

[0009] The front end of the drive shaft of the second pre-assembled assembly is inserted into the bearing housing of the first pre-assembled assembly, while the rotor is assembled into the stator assembly.

[0010] Provide a second bearing and a lower housing assembly with a preloaded spring;

[0011] The second bearing is installed at the rear end of the drive shaft of the second pre-assembled assembly. Then, the lower housing assembly is assembled onto the second pre-assembled assembly and the lower housing assembly is docked with the upper housing assembly. At the same time, the preload spring abuts against the second bearing, so that the preload spring generates a preload on the second bearing in the direction of the first bearing.

[0012] Alternatively, the assembly method provided by the present invention, wherein providing the upper housing assembly includes:

[0013] The front housing and bearing bracket are provided separately;

[0014] Installing the first bearing into the upper housing assembly includes:

[0015] After applying adhesive to the first bearing, it is installed into the front housing, and then the bearing bracket is installed.

[0016] Alternatively, the assembly method provided by the present invention, wherein providing the stator assembly includes:

[0017] Stator outer ring, insulating support and stator module are provided respectively;

[0018] The stator module is assembled into the stator outer ring;

[0019] The insulating bracket is installed between two adjacent stator modules inside the outer ring of the stator.

[0020] Alternatively, the assembly method provided by the present invention, wherein providing the stator module includes:

[0021] Iron core blocks, coil supports, and stator coils are provided separately.

[0022] The iron core block and the coil support are integrally injection molded, and the stator coil is wound on the coil support.

[0023] Alternatively, the assembly method provided by the present invention, wherein assembling the rotor and the fan onto the drive shaft respectively, includes:

[0024] First, the rotor is mounted on the drive shaft, and then the fan is mounted on the drive shaft, with the fan mounted on the rear side of the rotor.

[0025] Alternatively, the assembly method provided by the present invention, wherein providing the lower housing assembly includes:

[0026] The rear housing and preload spring are provided separately.

[0027] The preloaded spring is installed into the first receiving structure of the rear housing.

[0028] Alternatively, the assembly method provided by the present invention includes docking the lower housing assembly with the upper housing assembly, comprising:

[0029] The second bearing is installed into the first receiving structure of the rear housing after applying adhesive, or the second bearing is installed into the first receiving structure after applying adhesive to the inner surface of the first receiving structure.

[0030] Alternatively, the assembly method provided by the present invention, wherein the lower housing assembly is docked with the upper housing assembly, includes:

[0031] The rear housing is heated and then connected to the outside of the front housing via a heat-shrink process.

[0032] Alternatively, in the assembly method provided by the present invention, after the rear housing is heated and connected to the outside of the front housing through a heat fitting process, at least a portion of the front housing is located inside the rear housing.

[0033] Alternatively, the assembly method provided by the present invention further includes:

[0034] Provide an insulating cover;

[0035] The insulating jacket is fitted over the outside of the upper housing assembly and abuts and seals with the rear housing of the lower housing assembly.

[0036] Alternatively, the assembly method provided by the present invention further includes:

[0037] Terminal blocks and control boxes are provided;

[0038] The terminal block is installed at the front end of the insulating jacket;

[0039] The control box is mounted on the terminal block.

[0040] Implementing this invention has the following beneficial effects:

[0041] The high-speed motor assembly method provided by this invention arranges a preload spring on one side of the drive shaft and positions the fan at the rear end to achieve negative pressure suction, reducing the airflow lag effect when the rotor is running at high speed. This allows the rotor to operate stably at higher speeds through the preload action of the preload spring. The direction of the force exerted by the fan rotation on the drive shaft is the same as the direction of the preload force exerted by the preload spring on the drive shaft, ensuring a tight fit between the two bearings and the drive shaft. This prevents axial movement of the drive shaft caused by changes in fan speed after motor assembly, reduces vibration, and improves the stability of the motor during high-speed rotation. Attached Figure Description

[0042] Figure 1 This is a cross-sectional view of the overall structure of the motor provided in an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of the assembly structure of the motor provided in an embodiment of the present invention (with the insulating outer jacket and rear housing removed);

[0044] Figure 3 This is a schematic diagram of the assembly structure of the motor provided in an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the internal structure of the motor provided in an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the motor assembly process provided in an embodiment of the present invention.

[0047] The reference numerals in the figure:

[0048] 10. Drive shaft; 11. Rotor; 12. Fan; 13. First bearing; 14. Second bearing; 15. Preload spring; 121. Concave hole;

[0049] 21. Rear housing; 22. Insulating jacket; 23. First housing structure; 24. Guide vane; 25. Second housing structure; 26. Support rod;

[0050] 30. Front housing; 31. Bearing housing; 32. Connecting rod; 33. Air guide duct;

[0051] 40. Outer ring of iron core; 41. Iron core block; 42. Coil support; 43. Stator coil; 44. Insulation support; 45. Air guide hole; 46. Extension; 47. Arc-shaped protrusion; 48. Guide post; 49. Ventilation hole;

[0052] 50. Bearing bracket; 51. Terminal block; 52. Control box; 55. Connection hole;

[0053] 61 First pre-assembled component; 62 Second pre-assembled component. Detailed Implementation

[0054] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0055] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0057] like Figure 5 As shown, this embodiment provides a method for assembling a high-speed motor, including:

[0058] The upper housing assembly, the first bearing 13, and the stator assembly are provided respectively.

[0059] The first bearing 13 is installed into the bearing seat 31 of the upper housing assembly, and then the stator assembly is installed into the upper housing assembly to form the first pre-assembled assembly 61.

[0060] Rotor 11, drive shaft 10 and fan 12 are provided respectively;

[0061] The rotor 11 and fan 12 are respectively assembled onto the drive shaft 10 to form the second pre-assembled assembly 62. The rotor 11 is located in front of the fan 12. The rotor 11 and fan 12 are respectively assembled onto the drive shaft 10 by a fixed connection. The positions for mounting bearings need to be reserved at both ends of the drive shaft 10.

[0062] The front end of the drive shaft 10 of the second pre-assembly assembly 62 is inserted into the bearing housing of the first pre-assembly assembly 61, while the rotor 11 is assembled in the stator assembly.

[0063] Provides a second bearing 14 and a lower housing assembly with a preload spring 15;

[0064] The second bearing 14 is installed at the rear end of the drive shaft 10 of the second pre-assembly assembly 62. Then, the lower housing assembly is assembled into the second pre-assembly assembly 62 and the lower housing assembly is docked with the upper housing assembly. At the same time, the preload spring 15 abuts against the second bearing 14, so that the preload spring 15 generates a preload on the second bearing 14 in the direction of the first bearing 13.

[0065] The assembly method of the high-speed motor provided by the present invention arranges the preload spring 15 on one side of the drive shaft 10 and arranges the fan 12 at the rear end to achieve negative pressure suction, reducing the airflow lag effect when the rotor 11 is running at high speed. Thus, the rotor 11 can run stably at a high speed through the preload effect of the preload spring 15. The direction of the force exerted by the fan 12 on the drive shaft 10 is the same as the direction of the preload force of the preload spring 15 on the drive shaft 10, so that the two bearings and the drive shaft 10 are tightly assembled. This avoids the axial movement of the drive shaft 10 caused by changes in fan speed after the motor is assembled, reduces vibration, and improves the stability of the motor when it rotates at high speed.

[0066] Alternatively, in the assembly method provided by the present invention:

[0067] Provide upper housing components, including:

[0068] A front housing 30 and a bearing bracket 50 are provided respectively; after the first bearing 13 is installed into the bearing seat 31 of the front housing 30, the bearing bracket 50 is then installed on the outside of the first bearing 13.

[0069] The first bearing 13 is installed into the upper housing assembly, including:

[0070] After applying adhesive, the first bearing 13 is installed into the bearing seat 31 of the front housing 30. Then, the bearing bracket 50 is installed on the outside of the first bearing 13. The bearing bracket 50 and the bearing seat 31 are connected and fixed to each other by corresponding connecting rods 32 and extensions 46 to prevent the bearing bracket 50 from rotating.

[0071] Alternatively, in the assembly method provided by the present invention, a stator assembly is provided, comprising:

[0072] The stator outer ring 40, the insulating support 44, and the stator module are provided respectively.

[0073] The stator mold is assembled into the stator outer ring 40;

[0074] The insulating bracket 44 is inserted between two adjacent stator modules inside the stator outer ring 40, so that the protrusion in the middle of the insulating bracket 44 abuts against the iron core blocks of the stator modules on both sides, thereby fixing the stator modules inside the stator outer ring 40.

[0075] Alternatively, the assembly method provided by the present invention provides a stator module, comprising:

[0076] Iron core block 41, coil bracket 42, and stator coil 43 are provided respectively;

[0077] The iron core block 41 and the coil support 42 are integrally injection molded. The stator coil 43 is wound on the coil support 42. Through integral injection molding, the coil support 42 is formed on the iron core block 41. The insulating material of the coil support 42 can insulate the iron core block 41 and provide a carrier for the winding of the stator coil 43.

[0078] Alternatively, the assembly method provided by the present invention, which assembles the rotor 11 and the fan 12 onto the drive shaft 10 respectively, includes:

[0079] First, install the rotor 11 on the drive shaft 10, then install the fan 12 on the drive shaft 10, and install the fan 12 on the rear side of the rotor 11.

[0080] Alternatively, the assembly method provided by the present invention provides a lower housing assembly, comprising:

[0081] The rear housing 21 and the preload spring 15 are provided respectively;

[0082] The preload spring 15 is installed in the first receiving structure 23 of the rear housing 21. The preload spring 15 is typically a cylindrical structure and has a certain elasticity, enabling it to generate a rebound force after being compressed. In this embodiment, the preload spring 15 deforms under pressure after contacting the second bearing 14, thereby generating a preload on the second bearing 14 and pushing the second bearing 14 toward the first bearing 13.

[0083] Alternatively, the assembly method provided by the present invention includes docking the lower housing assembly with the upper housing assembly, comprising:

[0084] The second bearing 14 is installed into the first receiving structure 23 of the rear housing 21 after applying adhesive, or the second bearing 14 is installed into the first receiving structure 23 after applying adhesive to the inner surface of the first receiving structure 23.

[0085] Alternatively, the assembly method provided by the present invention, in which the lower housing assembly is docked with the upper housing assembly, includes:

[0086] The rear housing 21 is heated and then connected to the outside of the front housing 30 via a heat-shrink process.

[0087] Furthermore, after heating the rear housing 21 and connecting it to the outside of the front housing 30 through a heat-fitting process, at least a portion of the front housing 30 is located inside the rear housing 21. Specifically, a portion of the front housing 30 near the fan 12 is located inside the rear housing 21, while another portion protrudes from within the rear housing 21.

[0088] Alternatively, the assembly method provided by the present invention further includes:

[0089] Provide insulating jacket 22;

[0090] The insulating jacket 22 is placed over the outside of the upper housing assembly and is mated and sealed with the rear housing 21 of the lower housing assembly.

[0091] Alternatively, the assembly method provided by the present invention further includes:

[0092] A terminal block 51 and a control box 52 are provided; the terminal block 51 is made of insulating material, such as... Figure 3 As shown, the terminal board 51 has a connection hole 55 at the position corresponding to the guide post 48 of the stator assembly, so that the guide post 48 can pass through the connection hole 55 and be fixed to the connection hole 55 (usually it can be fixed by welding, but it is not limited thereto, and those skilled in the art can also use other common methods to fix the guide post 48 in the connection hole 55); the terminal board 51 is also provided with wires or printed circuits so that the guide post 48 can be connected to the circuit or chip on the control box 52.

[0093] Terminal block 51 is installed at the front end of insulating jacket 22;

[0094] A control box 52 is installed on the terminal board 51. The control box 52 is equipped with corresponding circuits or integrated chips. It can be connected to the guide post 48 through the printed circuit on the terminal board 51. When the control box 52 is connected to an external power supply, it can make the stator coil 43 work to generate a magnetic field, thereby driving the rotor 11 to rotate and driving the fan 12 to rotate.

[0095] like Figure 1-4 As shown, this embodiment provides a motor, including a drive shaft 10, a rotor 11, and a fan 12, wherein: the rotor 11 is connected to the drive shaft 10; the fan 12 is connected to the drive shaft 10 and is located at the rear end of the rotor 11. The rotor 11 rotates under the action of the changing magnetic field of the stator, thereby driving the fan 12 to operate. Since the fan 12 is located at the rear end of the rotor 11, the fan 12 can generate a negative pressure suction effect on the motor body at the rotor 11 during rotation.

[0096] In this embodiment, two bearings are installed on the drive shaft 10, and a preload spring 15 is provided at one end of the fan 12 so that the axial force of the fan 12 on the drive shaft 10 is in the same direction as the preload of the preload spring 15 on the drive shaft 10. This avoids axial movement of the drive shaft caused by changes in fan speed, reduces vibration, and improves the stability of the motor when it rotates at high speed. The technical solution of this embodiment is specifically achieved through the following settings: a first bearing 13 is provided on the drive shaft 10 at the front end of the rotor 11, and a second bearing 14 is provided on the drive shaft 10 at the rear end of the rotor 11. The rear end of the second bearing 14 is connected to or abuts against the preload spring 15.

[0097] In this embodiment, in order to make the motor structure complete, basic structural components such as housing, stator, and control unit are also required during implementation.

[0098] The front and rear ends are described relative to the rotor. The front end usually refers to the air inlet of the motor, and the rear end refers to the air outlet of the motor.

[0099] The motor provided in this embodiment has a preload spring 15 arranged on one side of the drive shaft 10, and the fan 12 is arranged at the rear end to achieve negative pressure suction, which reduces the airflow lag when the rotor 11 is running at high speed. Thus, the rotor can run stably at a high speed through the preload action of the preload spring 15. The direction of the force exerted by the fan 12 on the drive shaft 10 is the same as the direction of the preload force of the preload spring 15 on the drive shaft 10, so that the drive shaft 10 is tightly assembled between the two bearings. This avoids the axial movement of the drive shaft 10 caused by changes in fan speed after the motor is assembled, reduces vibration, and improves the stability of the motor when it rotates at high speed.

[0100] Alternatively, the motor provided in this embodiment also includes a stator assembly and a rear housing 21: the stator assembly can perform the basic function of a stator, and the stator assembly is connected to the outside of the rotor 11, so that the rotor 11 can rotate under the drive of the stator assembly; the rear housing 21 has a cylindrical structure, the rear housing 21 is fixed to the outside of the stator assembly, and the fan 12 is housed therein, and the rear housing 21 is connected to the stator assembly so that the rear housing 21 and the stator assembly can be fixed to each other to form an accommodating space, ensuring that the rotor 11 and the fan 12 rotate therein;

[0101] The rear housing 21 has a recessed first receiving structure 23 in the center. The first receiving structure 23 is usually a cylindrical structure with one end open and the other end closed or semi-closed. The second bearing 14 and the preload spring 15 are placed in the first receiving structure 23. The preload spring 15 is installed inside the first receiving structure 23, and the second bearing 14 is located outside the first receiving structure 23, that is, the second bearing 14 is closer to the stator assembly than the preload spring 15. The depth of the first receiving structure 23 should be sufficient to allow the preload spring 15 to exert a preload on the second bearing 14 after it is assembled therein. The second bearing 14 and the inner wall of the first receiving structure 23 are fitted with a clearance, so that the preload spring 15 can adjust the position of the second bearing 14 in the first receiving structure 23 by preload.

[0102] Alternatively, in the motor provided in this embodiment, one end of the preload spring 15 abuts against the bottom of the first receiving structure 23, and the other end abuts against or connects to the second bearing 14. An air hole is provided at the bottom of the first receiving structure 23 to balance the air pressure inside and outside the first receiving structure 23. During the process of the preload spring 15 adjusting the position of the second bearing 14, there will be relative sliding between the second bearing 14 and the first receiving structure 23. Due to the adhesive connection between the second bearing 14 and the first receiving structure 23, the interior of the first receiving structure 23 may experience negative pressure relative to the outside, causing the second bearing 14 to fail to move into position or become stuck. Therefore, the air hole is designed to balance the pressure difference inside and outside the first receiving structure 23, ensuring pressure balance and allowing the second bearing 14 to move axially within the first receiving structure 23.

[0103] Alternatively, the motor provided in this embodiment also includes a front housing 30, which is connected to the outside of the stator assembly to provide a fixed space for the stator assembly; at least part of the front housing 30 is fixed inside the rear housing 21. Optionally, the rear housing 21 and the front housing 30 are connected by a heat fitting process so that the rear housing 21 and the front housing 30 can be fixed to each other to form an accommodating space to ensure that the rotor 11 and the fan 12 rotate therein.

[0104] Alternatively, in this embodiment, the motor has a front housing 30 with a longitudinally arranged air guide groove 33; the air guide groove 33 can be arranged along the outer or inner side of the front housing 30, specifically:

[0105] The air guide slot 33 is disposed on the outer side of the front housing 30 to form an air guide channel with the rear housing 21; or, the air guide slot 33 is disposed on the inner side of the front housing 30 to form an air guide channel with the stator assembly.

[0106] The air guide channel formed by the air guide groove 33 can guide air under the action of the fan 12, thereby expanding the cross-section of the air guide channel and increasing the air volume.

[0107] Alternatively, in the motor provided in this embodiment, the stator assembly includes an outer ring 40 of the iron core and a stator module, wherein: the outer ring 40 of the iron core is a hollow cylindrical structure, usually a cylindrical structure, thereby providing installation space for the stator module; the stator module is connected inside the outer ring 40 of the iron core, and there can be 3 sets of stator modules, which are evenly distributed on the inner circumference of the outer ring 40 of the iron core. The function of the stator module is to provide stator coils 43, insulating supports 44, iron core blocks 41 and coil supports 42.

[0108] Alternatively, in the motor provided in this embodiment, the stator module includes an iron core block 41, a coil support 42, a stator coil 43, and an insulating support 44. The iron core block 41 is longitudinally connected to the inner wall of the outer ring 40 of the iron core. The function of the iron core block 41 is to form the core of the entire stator together with the outer ring 40. The iron core block 41 is directly and fixedly connected to the outer ring 40 of the iron core, and there is a large contact surface between them to ensure sufficient contact and better magnetic conductivity. The coil support 42 is connected inside the outer ring 40 of the iron core and is integrally injection molded with the iron core block 41. The coil support 42 is made of insulating material, typically plastic, to facilitate integral injection molding of the coil support 42 and the iron core block 41. The stator coil 43 is wound around the coil support 42. The insulating support 44 is located inside the outer ring 40 of the iron core and abuts between two adjacent coil supports 42. The insulating support 44 can have a V-shaped structure, and its function is to provide an insulating medium together with the coil support 42 to prevent creepage.

[0109] Alternatively, in the motor provided in this embodiment, a ventilation gap 49 is formed between the insulating bracket 44 and the stator coil 43 and the coil bracket 42. The ventilation gap 49 is connected to the air inlet and the air outlet, which can not only increase the air guide channel and make the air volume greater, but also dissipate heat from the stator coil 43, so that the heat of the stator coil 43 is directly carried away.

[0110] Alternatively, the motor provided in this embodiment has an air guide hole 45 extending in a direction parallel to the motor axis in the inner wall of the outer ring 40 of the iron core outside the insulating bracket 44. The function of the air guide hole 45 is to increase the area of ​​the air guide channel, so as to increase the air volume, and at the same time, to remove the heat of the outer ring 40 of the iron core.

[0111] Alternatively, in the motor provided in this embodiment, the inner wall of the outer ring 40 of the iron core has a radially formed arc-shaped protrusion 47, and an air guide hole 45 is formed on the arc-shaped protrusion 47. The shape of the arc-shaped protrusion 47 is adapted to the shape of the insulating support 44, so that the insulating support 44 can be attached to the arc-shaped protrusion 47 and supported by the arc-shaped protrusion 47. The design of the arc-shaped protrusion 47 can improve the support strength of the entire outer ring 40 of the iron core, and the air guide hole 45 is provided to maximize the area of ​​the air guide channel.

[0112] Alternatively, the motor provided in this embodiment has a plurality of air guide holes 45, and all air guide holes 45 are symmetrically arranged or evenly distributed in the circumferential direction. The number of air guide holes 45 can also be selected according to the number of stator modules, with one air guide hole 45 provided between two adjacent coil supports 42.

[0113] Alternatively, in the motor provided in this embodiment, the front end of the coil bracket 42 is provided with two connecting guide posts 48. The two connecting guide posts 48 are connected to the two ends of the stator coil 43 respectively. The connecting guide posts 48 are made of metal material, so as to provide support and conduction. When the two connecting guide posts 48 are connected to the external circuit to form a closed loop, the stator coil 43 can be energized to form a magnetic field.

[0114] Alternatively, in the motor provided in this embodiment, the iron core block 41 is inverted T-shaped; there are three iron core blocks 41, arranged in an equilateral triangle around the rotor 11, with a through hole formed in the middle for assembly with the rotor 11. Setting the iron core block 41 to three is a preferred arrangement, with the middle positions of the three iron core blocks 41 all being arc-shaped, and the overall assembly forming a circular hole to accommodate the rotor 11. Correspondingly, in this embodiment, the structure of the coil support 42 is adapted to the shape of the iron core block 41, and the iron core block 41, except for the parts that mate with the rotor 11 and the parts that abut with the outer ring 40 of the iron core, is covered by the coil support 42. Furthermore, the coil support 42 is made of insulating material, thereby providing insulation and preventing creepage.

[0115] Alternatively, in the motor provided in this embodiment, a longitudinally arranged dovetail groove is provided on the inner wall of the outer ring 40 of the iron core corresponding to the connection part of the iron core block 41. The iron core block 41 is installed in the dovetail groove, and the iron core block 41 is connected to the inner wall of the outer ring 40 of the iron core through the dovetail groove structure, so that the connection is more stable.

[0116] Alternatively, in the motor provided in this embodiment, the first housing structure 23 is connected to the inner wall of the rear housing 21 by a guide vane 24. The first housing structure 23 itself forms a cylindrical structure and is located at the center of the rear housing 21. The guide vane 24 fixes the first housing structure 23 to the inner wall of the rear housing 21 from different directions.

[0117] Alternatively, the motor provided in this embodiment has a recessed hole 121 around the shaft hole of the fan 12 that can be fitted onto the outside of the first receiving structure 23, and a gap is maintained between the recessed hole 121 and the outer wall of the first receiving structure 23. The recessed hole 121 fitted onto the outside of the first receiving structure 23 can ensure that no airflow passes through the second bearing 14 inside the first receiving structure 23, thereby extending the service life of the second bearing 14 inside the first receiving structure 23.

[0118] Alternatively, the motor provided in this embodiment further includes an insulating jacket 22, which is joined with the rear housing 21 to form a cylindrical outer shell, and the front housing 30 is fixed inside the cylindrical outer shell; when the air guide groove 33 of the front housing 30 is provided on the outside, an air guide channel is formed between the air guide groove 33, the insulating jacket 22, and the rear housing 21. The insulating jacket 22 itself is usually also a cylindrical structure with a cylindrical inner wall. The external dimensions of the insulating jacket 22 are usually the same as those of the rear housing 21, and it is also usually a cylindrical structure. The insulating jacket 22 and the rear housing 21 are joined and sealed to each other, thereby providing an air guide channel and preventing airflow leakage through the joint between them. The outer diameter profile and basic length of the entire motor are determined by the insulating jacket 22 and the rear housing 21.

[0119] Alternatively, in the motor provided in this embodiment, the front end center of the insulating jacket 22 is provided with a protruding second receiving structure 25, and a bearing seat 31 is formed at the front end center of the front housing 30. The bearing seat 31 is installed inside the second receiving structure 25 and is used to connect with the first bearing 13. The second receiving structure 25 is usually a cylindrical blind hole structure. The second receiving structure 25 protrudes forward to form a protrusion, and a receiving space is formed inside the second receiving structure 25 to assemble the bearing seat 31 therein. The bearing seat 31 can assemble the first bearing 13 and position the first bearing 13. The blind hole structure of the second receiving structure 25 can protect the bearing seat 31 and the first bearing 13 inside it, preventing airflow from passing through the first bearing 13 during the operation of the fan. As part of the insulating jacket 22, the second receiving structure 25 itself is also made of insulating material, so the second receiving structure 25 can also play an insulating role.

[0120] Alternatively, in this embodiment, the second housing structure 25 of the motor is integrated with the side wall of the insulating jacket 22 via support rods 26. There are six support rods 26 arranged radially in six directions. Those skilled in the art will know that the number of support rods 26 can also be three, four, five, or other values ​​greater than three. The bearing seat 31 is connected to the side wall of the front housing 30 via connecting rods 32. Furthermore, the positions of the support rods 26 and connecting rods 32 correspond one-to-one in the circumferential direction, and their orthographic projections in the axial direction of the motor correspond, thus minimizing their impact on the air intake surface. When the insulating jacket 22 is sleeved with the front housing 30, the support rods 26 and connecting rods 32 also connect or contact accordingly, thereby strengthening the overall support strength of the insulating jacket or front housing 30 to a certain extent.

[0121] Alternatively, the motor provided in this embodiment also includes a bearing bracket 50, which is connected to the bearing housing 31 to form a receiving space for accommodating the first bearing 13. The bearing bracket 50 also has a shaft hole that allows the drive shaft 10 to pass through. Typically, the bearing bracket 50 and the first bearing 14 are both mounted on the front end of the drive shaft 10, the first bearing 13 is assembled into the bearing housing 31, and then the bearing bracket 50 is mounted on the first bearing 13.

[0122] Alternatively, in this embodiment, the bearing bracket 50 of the motor is made of insulating material and can protect the first bearing 13.

[0123] Alternatively, in the motor provided in this embodiment, the support rod 26 has a groove structure, and the connecting rod 32 is inserted into the groove. Correspondingly, the bearing bracket 50 has an extension 46 corresponding to the connecting rod. The extension 46 and the support rod 26 are located on both sides of the connecting rod 32, and the extension 46 and the groove structure are connected to form a space to accommodate the connecting rod 32. The extension 46 and the support rod 26 are connected from both sides of the connecting rod 32 and surround the connecting rod 32, thereby forming a mutually embedded connection structure, which further improves the structural strength of the bearing seat and makes the first bearing 13 more securely fixed.

[0124] Alternatively, in this embodiment, the second receiving structure 25 of the motor is a cylindrical cavity; a terminal plate 51, also circular, is provided on the outside of the second receiving structure 25; the connecting guide post 48 of each stator module is connected to the terminal plate 51 respectively, and corresponding opening structures need to be provided on the terminal plate 51 for the connecting guide post 48 to pass through and fix the connecting guide post 48. The terminal plate 51 and the second receiving structure 25 at the front end of the insulating jacket 22 are in close contact with each other, and the second receiving structure 25 provides support for the terminal plate 51. The terminal plate 51 is also made of insulating material.

[0125] Alternatively, the motor provided in this embodiment also includes a control box 52, which is connected to the terminal board 51 and is connected to the connecting post 48 of the stator module through the lines on the terminal board 51.

[0126] This embodiment also provides a hair dryer, which can be a hair dryer. The motor used in this hair dryer is the motor provided in the above embodiments. By using the motor provided in the above embodiments, the axial movement generated by the motor rotation during the operation of the hair dryer can be effectively reduced, thereby reducing noise and vibration.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An assembling method of a high-speed motor, comprising: respectively providing an upper casing assembly, a first bearing (13), and a stator assembly; assembling the first bearing (13) into the upper casing assembly, and then assembling the stator assembly into the upper casing assembly to form a first pre-assembled assembly (61); the providing of the upper casing assembly comprises: respectively providing a front casing (30) and a bearing bracket (50); the assembling of the first bearing (13) into the upper casing assembly comprises: assembling the first bearing (13) into the front casing (30) after being glued, and then assembling the bearing bracket (50); respectively providing a rotor (11), a driving shaft (10), and a fan (12); assembling the rotor (11) and the fan (12) to the driving shaft (10) respectively to form a second pre-assembled assembly (62); assembling a front end of the driving shaft (10) of the second pre-assembled assembly (62) into a bearing seat of the first pre-assembled assembly (61), and assembling the rotor (11) into the stator assembly; providing a second bearing (14) and a lower casing assembly with a pre-pressing spring (15); assembling the second bearing (14) to a rear end of the driving shaft (10) of the second pre-assembled assembly (62), and then assembling the lower casing assembly to the second pre-assembled assembly (62), and abutting the lower casing assembly with the upper casing assembly, and abutting the pre-pressing spring (15) against the second bearing (14), so that the pre-pressing spring (15) generates a pre-pressing force on the second bearing (14) in the direction of the first bearing (13); the force direction of the fan (12) rotating against the driving shaft (10) is the same as the pre-pressing force direction of the pre-pressing spring (15) against the driving shaft (10), so that the first bearing (13), the second bearing (14), and the driving shaft (10) are tightly assembled.

2. The assembling method according to claim 1, wherein the providing of the stator assembly comprises: respectively providing a stator outer ring (40), an insulating support (44), and a stator module; assembling the stator module into the stator outer ring (40); assembling the insulating support (44) between two adjacent stator modules in the stator outer ring (40).

3. The assembling method according to claim 2, wherein the providing of the stator module comprises: respectively providing a core block (41), a coil support (42), and a stator coil (43); integrally injection molding the core block (41) and the coil support (42), and winding the stator coil (43) on the coil support (42).

4. The assembling method according to claim 1, wherein the assembling of the rotor (11) and the fan (12) to the driving shaft (10) respectively comprises: firstly assembling the rotor (11) to the driving shaft (10), and then assembling the fan (12) to the driving shaft (10) and the fan (12) is assembled to a rear side of the rotor (11). ​ ​ ​ 5. The assembling method according to claim 1, wherein, a lower casing assembly is provided, comprising: a rear casing (21) is provided respectively, a pre-press spring (15) is provided respectively; the pre-press spring (15) is assembled into the first accommodating structure (23) of the rear casing (21).

6. The assembling method according to claim 5, wherein, the lower casing assembly is butted with the upper casing assembly, comprising: the second bearing (14) is assembled into the first accommodating structure (23) of the rear casing (21) after being coated with glue, or the second bearing (14) is assembled into the first accommodating structure (23) after the inner surface of the first accommodating structure (23) is coated with glue.

7. The assembling method according to claim 5, wherein, the lower casing assembly is butted with the upper casing assembly, comprising:

8. The method of assembling according to claim 7, wherein, the rear casing (21) is heated, and then butted with the outside of the front casing (30) through a hot sleeve process. after the rear casing (21) is heated and butted with the outside of the front casing (30) through the hot sleeve process, at least a part of the front casing (30) is located in the rear casing (21).

9. The assembling method according to claim 7, wherein, further comprising: an insulating sleeve (22) is provided; the insulating sleeve (22) is sleeved on the outside of the upper casing assembly, and is butted and sealed with the rear casing (21) of the lower casing assembly; further comprising: a terminal plate (51) and a control box (52) are provided; the terminal plate (51) is installed at the front end of the insulating sleeve (22); the control box (52) is installed on the terminal plate (51).

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