Plastic package direct current outer rotor motor and processing method thereof

Abstract

According to the plastic package direct current outer rotor motor and the processing method thereof, a positioning notch is reserved, so that a PCB is limited through the positioning notch in the plastic package process, the PCB is prevented from deviating in the plastic package process, the PCB is not completely packaged in a plastic package shell in a plastic package mode, a part of the PCB is exposed outside, and electronic elements are installed on the exposed part of the PCB. Damage to electronic components caused by high temperature and high pressure in the plastic packaging process is avoided, the heat dissipation performance is good, part of parts are omitted through plastic packaging integrated forming, and the manufacturing cost is saved; the method comprises the following steps: S1, preparing a stator winding; s2, preparing a PCB (Printed Circuit Board); s3, preparing for plastic packaging; s4, mounting a stator assembly; s5, a protection piece and a dustproof plate are installed; s6, motor characteristic detection; the threading hole is covered before plastic packaging of the PCB, the situation that a copper sheet in the threading hole falls off to affect the conduction effect in the plastic packaging process is avoided, the surface of the MCU is covered with the flexible glue, and the situation that the MCU is damaged due to high temperature and high pressure in the plastic packaging process is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a plastic-sealed DC outer rotor motor and a processing method thereof. Background Art

[0002] The motor is one of the essential components of various electromechanical products. The main feature of the outer rotor motor is that the rotor is on the outside and the stator is on the inside. This design makes the outer rotor motor have the advantages of compact structure, small axial size, high material utilization, high specific power, etc. It is widely used in exhaust equipment, air conditioning units, air purification systems and cooling equipment. The movement direction of the rotor is opposite to the direction of the magnetic field, which makes the outer rotor motor have a higher braking torque.

[0003] In the prior art, when an outer rotor motor is plastic-sealed, the stator winding and the PCB board are usually welded together in a plastic-sealed shell. During the plastic-sealing process, the PCB board cannot be positioned, resulting in the PCB board being offset during the plastic-sealing process, affecting the plastic-sealing effect. During the plastic-sealing process, the electronic components in the PCB board may be damaged due to the influence of high temperature and high pressure. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a plastic-sealed DC outer rotor motor and a processing method thereof, so as to avoid the displacement of the PCB board during the plastic sealing process, and at the same time avoid the damage of electronic components caused by high temperature and high pressure.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A plastic-sealed DC outer rotor motor comprises a stator winding and a rotor assembly, wherein the rotor assembly is sleeved on the outside of the stator winding, the stator winding comprises a winding core and a coil, the coil is wound on the outside of the winding core, and the stator winding is provided with a rotating shaft;

[0007] The invention is characterized in that: it also includes a plastic-sealed shell, a PCB board and a protective member, the stator winding is connected to the PCB board, the stator winding and the PCB board are arranged in the plastic-sealed shell, the PCB board is partially exposed outside the plastic-sealed shell, the plastic-sealed shell is provided with a through hole that runs through the entire plastic-sealed shell, the rotor assembly is sleeved outside the plastic-sealed shell and the rotating shaft is located in the through hole, the plastic-sealed shell is provided with a positioning notch, the exposed part of the PCB board is located in the positioning notch, the protective member is installed in the positioning notch, and the protective member is used to protect the PCB board.

[0008] Furthermore, the PCB board includes a plastic-sealed part and a bare part. The plastic-sealed part is sealed inside the plastic-sealed shell, and the bare part is exposed outside the plastic-sealed shell. The bare part presents an inverted "T" shape. The bare part is installed with electronic components and wiring units. The wiring unit is used for wiring with the outside. An MCU controller is installed on the plastic-sealed part. The surface of the MCU controller is covered with soft glue, and a plurality of threading holes are provided on the PCB board.

[0009] Furthermore, a positioning protrusion is provided in the positioning notch, and the positioning protrusion is used to position the PCB board. The plastic package shell is provided with a contact surface, and the contact surface is used to support the PCB board.

[0010] Furthermore, the protective piece is sleeved on the outside of the PCB board, an opening is provided on one side of the protective piece, a clamping foot is provided on the side of the protective piece, the clamping foot is provided with a limiting protrusion, the protective piece is clamped on the PCB board through the clamping foot and the protective piece is limited on the PCB board through the limiting protrusion, an elastic protrusion is provided on the side of the protective piece, and the elastic protrusion is interference fit with the positioning groove.

[0011] Furthermore, the plastic-sealed shell includes a protrusion, an annular protrusion 1 and a receiving groove, the receiving groove is located between the protrusion and the annular protrusion 1, the rotor assembly is sleeved on the protrusion, the rotor assembly is located in the receiving groove, the annular protrusion 1 is arranged on the outside of the rotor assembly, and the annular protrusion 1 is used to limit the rotor assembly.

[0012] Furthermore, the rotor assembly includes a shell, a magnetic ring, a bearing 1 and a bearing 2, a through hole is provided with a bearing chamber 1 and a bearing chamber 2, the bearing 1 is installed in the bearing chamber 1, the bearing 2 is installed in the bearing chamber 2, a corrugated spring washer is installed between the bearing 2 and the bearing chamber 2, the rotating shaft passes through the bearing 1 and the bearing 2 and is installed in the through hole, the magnetic ring is arranged in the shell, and the shell is sleeved on the raised portion.

[0013] Furthermore, the top of the shell is recessed inward to form a groove, and the groove is bent to form an assembly part. The assembly part is provided with an assembly groove, and the assembly groove is coaxially arranged with the through hole. The rotating shaft passes through the assembly groove and is installed in the through hole, and the rotating shaft is fixedly connected to the assembly part.

[0014] Furthermore, it also includes a dustproof plate, which is installed at the bottom of the plastic-sealed shell. The dustproof plate is used to seal the through hole. The dustproof plate is provided with a mounting protrusion, and the plastic-sealed shell is correspondingly provided with a mounting through hole. The dustproof plate is installed with the plastic-sealed shell by inserting the mounting through hole through the mounting protrusion. The plastic-sealed shell is provided with two annular protrusions, and the dustproof plate is sleeved outside the two annular protrusions. The dustproof plate is provided with a first recessed groove, which is abutted against the two annular protrusions. The dustproof plate is provided with a second recessed groove, and the second recessed groove is used for placing the rotating shaft.

[0015] Furthermore, the plastic-sealed shell is provided with mounting feet, the plastic-sealed shell and the mounting feet are integrally formed, the mounting feet are provided with mounting holes, and the mounting holes are used for motor installation.

[0016] A method for processing a plastic-encapsulated DC outer rotor motor, characterized by comprising the following steps:

[0017] S1. Stator winding preparation: First, the coil is wound on the winding core by manual winding or automatic winding machine to form the stator winding, and then the stator winding is tinned by a tinning machine, and the excessively long coil is cut off;

[0018] S2. PCB board preparation: After the stator winding is prepared, the enameled wire from the stator winding is passed through the threading hole to connect to the PCB board, and then the threading hole is covered and soft glue is applied to the surface of the MCU controller on the PCB board to cover the MCU controller with the soft glue;

[0019] S3, plastic sealing preparation: before plastic sealing, the stator winding is first preheated to increase the fluidity of the plastic sealing material during the molding process, reduce the impact on the coil and the PCB board, and lower the curing molding temperature. Then, the stator winding and the PCB board are fixed to the corresponding plastic sealing mold for plastic sealing. The plastic sealing forms a plastic sealing shell, and the stator winding and the PCB board are plastic sealed in the plastic sealing shell;

[0020] S4. Stator assembly installation

[0021] 1) Install the rotating shaft: First, press bearing 1 into bearing chamber 1 in the through hole, and press bearing 2 into bearing chamber 2 in the through hole. When pressing bearing 2, first lay a corrugated spring washer in bearing chamber 2, and then press bearing 2 into bearing chamber 2 and abut against the corrugated spring washer.

[0022] 2) Assemble the shell: apply glue on the inner surface of the shell, then install and fix the magnetic ring in the shell;

[0023] 3) Assembling the housing and the rotating shaft: Then the housing is sleeved on the raised portion, and the rotating shaft passes through the assembly groove, and the rotating shaft is fixed to the assembly portion, so that the housing and the rotating shaft rotate synchronously, thereby realizing the installation of the stator assembly;

[0024] S5. Installation of protective parts and dustproof plates: Install the protective parts into the positioning notches. The protective parts are clamped on the exposed part of the PCB board through the limiting protrusions on the clamping feet. The electronic components and wiring units on the exposed part are protected by the protective parts. The dustproof plates are inserted into the installation through holes through the installation protrusions. The dustproof plates seal the second bearing chamber, thereby realizing the installation of the entire motor.

[0025] S6. Motor characteristics detection: After the motor is installed, the motor characteristics are detected to ensure the normal operation of the motor.

[0026] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0027] In the present invention, positioning notches are reserved so that the PCB board can be limited by the positioning notches during the plastic sealing process, thereby preventing the PCB board from being offset during the plastic sealing process. The PCB board is not completely plastic sealed in the plastic sealing shell, so that part of the PCB board is exposed, and the electronic components are mounted on the exposed part of the PCB board, thereby preventing the electronic components from being damaged by high temperature and high pressure during the plastic sealing process, and having good heat dissipation performance. At the same time, some parts are omitted through integrated plastic sealing, thereby saving production costs.

[0028] In the present invention, the threading holes are covered before the PCB board is plastic-sealed through the above method steps to prevent the copper foil in the threading holes from falling off and affecting the conduction effect during the plastic-sealing process. At the same time, soft glue is covered on the surface of the MCU controller to prevent the MCU controller from being damaged due to high temperature and high pressure during the plastic-sealing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] Figure 1 It is a structural schematic diagram of a plastic-encapsulated DC outer rotor motor of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the plastic package housing and the PCB board in the present invention;

[0032] Figure 3 This is a structural schematic diagram of the plastic package housing and the PCB board in the present invention from another perspective;

[0033] Figure 4 For the present invention Figure 2 A cross-sectional view of

[0034] Figure 5 It is a schematic diagram of the structure of the plastic-sealed housing in the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the dustproof plate in the present invention;

[0036] Figure 7 It is a structural schematic diagram of the PCB board in the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of the protective member in the present invention.

[0038] In the figure: 1-stator winding; 2-rotor assembly; 3-winding core; 4-coil; 5-rotating shaft; 6-plastic housing; 7-PCB board; 8-protective member; 9-through hole; 10-positioning notch; 11-plastic sealing part; 12-exposed part; 13-electronic component; 14-wiring unit; 15-MCU controller; 16-threading hole; 17-positioning protrusion; 18-contact surface; 19-opening; 20-card foot; 21-limiting protrusion; 22-protrusion; 2 3-annular protrusion one; 24-accommodating groove; 25-housing; 26-magnetic ring; 27-bearing one; 28-bearing two; 29-bearing chamber one; 30-bearing chamber two; 31-corrugated spring washer; 32-groove; 33-assembly part; 34-assembly groove; 35-dustproof plate; 36-mounting protrusion; 37-mounting through hole; 38-annular protrusion two; 39-first recessed groove; 40-second recessed groove; 41-mounting foot; 42-mounting hole; 43-elastic protrusion. DETAILED DESCRIPTION

[0039] like Figures 1 to 8 As shown, a plastic-sealed DC outer rotor motor of the present invention comprises a stator winding 1, a rotor assembly 2, a plastic-sealed housing 6, a PCB board 7, a protective member 8 and a dustproof plate 35. The rotor assembly 2 is sleeved on the outside of the stator winding 1. The stator winding 1 is provided with a rotating shaft 5. The stator winding 1 comprises a winding core 3 and a coil 4. The coil 4 is wound on the outside of the winding core 3. The stator winding 1 is connected to the PCB board 7. The stator winding 1 and the PCB board 7 are arranged in the plastic-sealed housing 6. The PCB board 7 is partially exposed outside the plastic-sealed housing 6. The plastic-sealed housing 6 is provided with a The through hole 9 of the plastic-sealed shell 6, the rotor assembly 2 is sleeved outside the plastic-sealed shell 6 and the rotating shaft 5 is located in the through hole 9, the rotor assembly 2 blocks the through hole 9 at one end, the plastic-sealed shell 6 is provided with a positioning notch 10, the exposed portion of the PCB board 7 is located in the positioning notch 10, the protective member 8 is installed in the positioning notch 10, and the protective member 8 is sleeved on the PCB board 7 to protect the PCB board 7, the dustproof plate 35 is installed at the bottom of the plastic-sealed shell 6, and the other end of the through hole 9 is blocked by the dustproof plate 35 to prevent dust and the like from entering the through hole 9 and affecting the operation of the motor.

[0040] The PCB board 7 includes a plastic sealing part 11 and a bare part 12. The plastic sealing part 11 is plastic-sealed inside the plastic sealing shell 6, and the bare part 12 is exposed outside the plastic sealing shell 6. The bare part 12 is in an inverted "T" shape. The electronic components 13 and the wiring unit 14 are installed on the bare part 12 to prevent the high temperature and high pressure in the plastic sealing process from damaging the electronic components 13. The wiring unit 14 is installed on the bare part 12 for easy electrical connection with the external lead. An MCU controller 15 is installed on the plastic sealing part 11. Since the MCU controller 15 is installed on the plastic sealing part 11, the plastic sealing part 11 needs to be plastic-sealed in the plastic sealing shell 6, so the surface of the MCU controller 15 is covered with soft glue to prevent the MCU controller 15 from being damaged by high temperature and high pressure during the plastic sealing process. A plurality of threading holes 16 are provided on the PCB board 7. When the stator winding 1 is connected to the PCB board 7, the wiring is carried out through the threading holes 16 to avoid the influence of disorder on the plastic sealing.

[0041] A positioning protrusion 17 is provided in the positioning groove 10, and the PCB board 7 is positioned by the positioning protrusion 17 during plastic sealing to prevent the PCB board 7 from shifting during the plastic sealing process and to ensure that the exposed part 12 of the PCB board 7 is not plastic sealed in the plastic sealing shell 6. The plastic sealing shell 6 is provided with a contact surface 18, and the contact surface 18 is used to support the PCB board 7, increase the contact surface 18 area between the plastic sealing shell 6 and the PCB board 7, and increase the pressure resistance.

[0042] In the present invention, the positioning notch 10 is reserved so that the PCB board 7 is limited by the positioning notch 10 during the plastic sealing process, thereby preventing the PCB board 7 from being offset during the plastic sealing process and ensuring that the exposed portion 12 of the PCB board 7 is not plastic sealed in the plastic sealing shell 6. By not completely plastic sealing the PCB board 7 in the plastic sealing shell 6, part of the PCB board 7 is exposed to the outside, and the electronic component 13 and the wiring unit 14 are installed on the exposed exposed portion 12 of the PCB board 7, thereby preventing the electronic component 13 from being damaged by high temperature and high pressure during the plastic sealing process, and having good heat dissipation performance. At the same time, through the integrated plastic sealing molding, some parts are omitted, thereby saving the production cost.

[0043] The protective member 8 is sleeved on the outside of the PCB board 7, and an opening 19 is provided on one side of the protective member 8. The wiring unit 14 is located at one end of the opening 19, so as to facilitate the electrical connection between the wiring unit 14 and the outside. A clamping foot 20 is provided on the side of the protective member 8, and the clamping foot 20 is provided with a limiting protrusion 21. The protective member 8 is clamped on the PCB board 7 through the clamping foot 20 and the protective member 8 is limited on the PCB board 7 through the limiting protrusion 21. Since the exposed part 12 of the PCB board 7 is in an inverted "T" shape, the protective member 8 is prevented from sliding out in parallel after being stuck on the exposed part 12. An elastic protrusion 43 is provided on the side of the protective member 8. The elastic protrusion 43 is tightly clamped in the positioning notch 10 by interference fit with the positioning notch 10, thereby increasing the stability of the installation of the protective member 8.

[0044] The plastic-sealed shell 6 includes a protrusion 22, an annular protrusion 23 and a receiving groove 24. The receiving groove 24 is located between the protrusion 22 and the annular protrusion 23. The rotor assembly 2 is sleeved on the protrusion 22. The end of the rotor assembly 2 is located in the receiving groove 24. The annular protrusion 23 is arranged on the outside of the rotor assembly 2. The rotor assembly 2 rotates along the receiving groove 24. The annular protrusion 23 is integrally formed with the plastic-sealed shell 6. The setting of the annular protrusion 23 prevents the rotor assembly 2 from detaching.

[0045] The rotor assembly 2 includes a housing 25, a magnetic ring 26, a bearing 1 27 and a bearing 2 28. The through hole 9 is provided with a bearing chamber 1 29 and a bearing chamber 2 30. The bearing chamber 1 29 and the bearing chamber 2 30 are both connected to the through hole 9. The bearing 1 27 is installed in the bearing chamber 1 29, and the bearing 2 28 is installed in the bearing chamber 2 30. A corrugated spring washer 31 is installed between the bearing 28 and the bearing chamber 2 30 to reduce the noise of the motor. The rotating shaft 5 passes through the bearing 1 27 and the bearing 2 28 and is installed in the through hole 9. The shaft 5 is tightly connected with the inner rings of the bearing 1 27 and the bearing 2 28, the magnetic ring 26 is arranged in the shell 25 by gluing, the shell 25 is sleeved on the raised portion 22, the top of the shell 25 is recessed inward to form a groove 32, the groove 32 is bent to form an assembly portion 33, the assembly portion 33 is horizontal with the top of the shell 25, the assembly portion 33 is provided with an assembly groove 34, the assembly groove 34 is coaxially arranged with the through hole 9, the rotating shaft 5 passes through the assembly groove 34 and is installed in the through hole 9, and the rotating shaft 5 is fixedly connected with the assembly portion 33.

[0046] The dustproof plate 35 is provided with a mounting protrusion 36, and the plastic-sealed shell 6 is correspondingly provided with a mounting through hole 37. The dustproof plate 35 is installed with the plastic-sealed shell 6 by inserting the mounting through hole 37 through the mounting protrusion 36. The plastic-sealed shell 6 is provided with a second annular protrusion 38, and the dustproof plate 35 is sleeved outside the second annular protrusion 38. The dustproof plate 35 is provided with a first recessed groove 39, and the first recessed groove 39 is abutted against the second annular protrusion 38 to increase the tight fit between the dustproof plate 35 and the plastic-sealed shell 6 to prevent dust from entering. The dustproof plate 35 is provided with a second recessed groove 40, and the second recessed groove 40 is used to place the rotating shaft 5.

[0047] The plastic package housing 6 is provided with a mounting foot 41 . The plastic package housing 6 and the mounting foot 41 are integrally formed. The mounting foot 41 is provided with a mounting hole 42 . The mounting hole 42 is used for motor installation.

[0048] A method for processing a plastic-encapsulated DC outer rotor motor, characterized by comprising the following steps:

[0049] S1. Preparation of stator winding 1: firstly, the coil 4 is wound on the winding core 3 by manual winding or automatic winding machine to form the stator winding 1, then the stator winding 1 is tinned by a tinning machine, and the excessively long coil 4 is cut off;

[0050] S2, PCB board 7 preparation: After the stator winding 1 is prepared, the enameled wire led out from the stator winding 1 is passed through the threading hole 16 to be connected to the PCB board 7, and then the threading hole 16 is covered and soft glue is applied to the surface of the MCU controller 15 on the PCB board 7, and the MCU controller 15 is covered with the soft glue;

[0051] S3, plastic packaging preparation: before plastic packaging, the stator winding 1 is first preheated to increase the fluidity of the plastic packaging material during the molding process, reduce the impact on the coil 4 and the PCB board 7, reduce the curing molding temperature, and reduce the adverse effects caused by the plastic packaging process. Then, the stator winding 1 and the PCB board 7 are fixed to the corresponding plastic packaging mold for plastic packaging, and the plastic packaging forms a plastic packaging shell. The stator winding 1 and the PCB board 7 are plastic-sealed in the plastic packaging shell;

[0052] In step S3, preferably, the encapsulating material can also be preheated to achieve the same effect, but attention should be paid to the timing of preheating the encapsulating material. After the preheating of the encapsulating material is completed, it needs to be immediately put into the encapsulating mold for molding, otherwise it will enter the expected reaction curing stage and become irreversible.

[0053] S4. Stator assembly installation

[0054] 1) Install the rotating shaft 5: First, press the bearing 1 27 into the bearing chamber 1 29 in the through hole 9, and press the bearing 2 28 into the bearing chamber 2 30 in the through hole 9. When pressing the bearing 28, first lay the corrugated spring washer 31 in the bearing chamber 2 30, and then press the bearing 2 28 into the bearing chamber 2 30 and abut against the corrugated spring washer 31.

[0055] 2) Assembling the housing 25: applying glue on the inner surface of the housing 25, and then installing and fixing the magnetic ring 26 in the housing 25;

[0056] 3) Assembling the housing 25 and the shaft 5: Then, the housing 25 is sleeved on the raised portion 22, and the shaft 5 passes through the assembly groove 34, and the shaft 5 is fixed to the assembly portion 33, so that the housing 25 and the shaft 5 rotate synchronously, thereby realizing the installation of the stator assembly;

[0057] S5, installation of the protective member 8 and the dustproof plate 35: the protective member 8 is installed in the positioning notch 10, the protective member 8 is clamped on the exposed part 12 of the PCB board 7 through the limiting protrusion 21 on the clamping foot 20, the electronic components 13 and the wiring unit 14 on the exposed part 12 are protected by the protective member 8, and the dustproof plate 35 is inserted into the installation through hole 37 through the installation protrusion 36, and the dustproof plate 35 closes the bearing chamber 2 30, thereby realizing the installation of the motor as a whole;

[0058] S6. Motor characteristics detection: After the motor is installed, the motor characteristics are detected to ensure the normal operation of the motor.

[0059] In the present invention, the threading hole 16 is covered before the PCB board 7 is plastic-sealed through the above-mentioned method steps to prevent the copper foil in the threading hole 16 from falling off and affecting the conduction effect during the plastic-sealing process. At the same time, soft glue is covered on the surface of the MCU controller 15 to prevent the MCU controller 15 from being damaged due to high temperature and high pressure during the plastic-sealing process.

[0060] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A plastic-encapsulated DC outer rotor motor, comprising a stator winding and a rotor assembly, wherein the rotor assembly is sleeved on the outside of the stator winding, the stator winding comprises a winding core and a coil, the coil is wound on the outside of the winding core, and the stator winding is equipped with a rotating shaft; Features: It also includes a plastic-sealed shell, a PCB board and a protective member, the stator winding is connected to the PCB board, the stator winding and the PCB board are arranged in the plastic-sealed shell, the PCB board is partially exposed outside the plastic-sealed shell, the plastic-sealed shell is provided with a through hole that runs through the entire plastic-sealed shell, the rotor assembly is sleeved outside the plastic-sealed shell and the rotating shaft is located in the through hole, the plastic-sealed shell is provided with a positioning notch, the exposed part of the PCB board is located in the positioning notch, the protective member is installed in the positioning notch, and the protective member is used to protect the PCB board.

2. The plastic-encapsulated DC outer rotor motor according to claim 1, characterized in that: The PCB board includes a plastic-sealed part and a bare part, the plastic-sealed part is plastic-sealed inside the plastic-sealed shell, and the bare part is bare outside the plastic-sealed shell. The bare part is in an inverted "T" shape, and the bare part is installed with electronic components and a wiring unit. The wiring unit is used for wiring with the outside. An MCU controller is installed on the plastic-sealed part, and the surface of the MCU controller is covered with soft glue. A plurality of threading holes are provided on the PCB board.

3. The plastic-encapsulated DC outer rotor motor according to claim 1, characterized in that: A positioning protrusion is provided in the positioning notch, and the positioning protrusion is used to position the PCB board. The plastic package shell is provided with a contact surface, and the contact surface is used to support the PCB board.

4. The plastic-encapsulated DC outer rotor motor according to claim 1, characterized in that: The protective member is sleeved on the outside of the PCB board, one side of the protective member is provided with an opening, the side of the protective member is provided with a clamping foot, the clamping foot is provided with a limiting protrusion, the protective member is clamped on the PCB board by the clamping foot and the protective member is limited on the PCB board by the limiting protrusion, the side of the protective member is provided with an elastic protrusion, and the elastic protrusion is interference fit with the positioning notch.

5. The plastic-encapsulated DC outer rotor motor according to claim 1, characterized in that: The plastic-sealed shell includes a protrusion, an annular protrusion 1 and a receiving groove, wherein the receiving groove is located between the protrusion and the annular protrusion 1, the rotor assembly is sleeved on the protrusion, the rotor assembly is located in the receiving groove, the annular protrusion 1 is arranged on the outside of the rotor assembly, and the annular protrusion 1 is used to limit the rotor assembly.

6. The plastic-encapsulated DC outer rotor motor according to claim 5, characterized in that: The rotor assembly includes a shell, a magnetic ring, a bearing 1 and a bearing 2. The through hole is provided with a bearing chamber 1 and a bearing chamber 2. The bearing 1 is installed in the bearing chamber 1, and the bearing 2 is installed in the bearing chamber 2. A corrugated spring washer is installed between the bearing 2 and the bearing chamber 2. The rotating shaft passes through the bearing 1 and the bearing 2 and is installed in the through hole. The magnetic ring is arranged in the shell, and the shell is sleeved on the raised portion.

7. The plastic-encapsulated DC outer rotor motor according to claim 6, characterized in that: The top of the shell is recessed inward to form a groove, and the groove is bent to form an assembly portion. The assembly portion is provided with an assembly groove, and the assembly groove is coaxially arranged with the through hole. The rotating shaft passes through the assembly groove and is installed in the through hole, and the rotating shaft is fixedly connected to the assembly portion.

8. The plastic-encapsulated DC outer rotor motor according to claim 1, characterized in that: It also includes a dustproof plate, which is installed at the bottom of the plastic-sealed shell. The dustproof plate is used to seal the through hole. The dustproof plate is provided with a mounting protrusion, and the plastic-sealed shell is correspondingly provided with a mounting through hole. The dustproof plate is inserted into the mounting through hole through the mounting protrusion to achieve installation with the plastic-sealed shell. The plastic-sealed shell is provided with two annular protrusions, and the dustproof plate is sleeved outside the two annular protrusions. The dustproof plate is provided with a first recessed groove, which is abutted against the two annular protrusions. The dustproof plate is provided with a second recessed groove, and the second recessed groove is used for the placement of the rotating shaft.

9. The plastic-encapsulated DC outer rotor motor according to claim 1, characterized in that: The plastic-sealed shell is provided with mounting feet, the plastic-sealed shell and the mounting feet are integrally formed, the mounting feet are provided with mounting holes, and the mounting holes are used for motor installation.

10. A method for processing a plastic-encapsulated DC outer rotor motor according to any one of claims 1 to 9, characterized in that The following steps are involved: S1. Stator winding preparation: First, the coil is wound on the winding core by manual winding or automatic winding machine to form the stator winding, and then the stator winding is tinned by a tinning machine, and the excessively long coil is cut off; S2. PCB board preparation: After the stator winding is prepared, the enameled wire from the stator winding is passed through the threading hole to connect to the PCB board, and then the threading hole is covered and soft glue is applied to the surface of the MCU controller on the PCB board to cover the MCU controller with the soft glue; S3, plastic sealing preparation: before plastic sealing, the stator winding is first preheated to increase the fluidity of the plastic sealing material during the molding process, reduce the impact on the coil and the PCB board, and lower the curing molding temperature. Then, the stator winding and the PCB board are fixed to the corresponding plastic sealing mold for plastic sealing. The plastic sealing forms a plastic sealing shell, and the stator winding and the PCB board are plastic sealed in the plastic sealing shell; S4. Stator assembly installation 1) Install the rotating shaft: First, press bearing 1 into bearing chamber 1 in the through hole, and press bearing 2 into bearing chamber 2 in the through hole. When pressing bearing 2, first lay a corrugated spring washer in bearing chamber 2, and then press bearing 2 into bearing chamber 2 and abut against the corrugated spring washer. 2) Assemble the shell: apply glue on the inner surface of the shell, then install and fix the magnetic ring in the shell; 3) Assembling the housing and the rotating shaft: Then the housing is sleeved on the raised portion, and the rotating shaft passes through the assembly groove, and the rotating shaft is fixed to the assembly portion, so that the housing and the rotating shaft rotate synchronously, thereby realizing the installation of the stator assembly; S5. Installation of protective parts and dustproof plates: Install the protective parts into the positioning notches. The protective parts are clamped on the exposed part of the PCB board through the limiting protrusions on the clamping feet. The electronic components and wiring units on the exposed part are protected by the protective parts. The dustproof plates are inserted into the installation through holes through the installation protrusions. The dustproof plates seal the second bearing chamber, thereby realizing the installation of the entire motor. S6. Motor characteristics detection: After the motor is installed, the motor characteristics are detected to ensure the normal operation of the motor.

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