Outer rotor motor with reducing mechanism arranged on inner circle of plastic package stator assembly and manufacturing method of outer rotor motor

Abstract

The invention provides a motor with a speed reducing mechanism arranged on the inner circle of a plastic package stator assembly, which comprises an outer rotor assembly, a stator assembly and the plastic package stator assembly formed by injection molding by taking the stator assembly as an insert, and is characterized in that the inner circumference of the plastic package stator assembly is provided with an integrated inner gear ring; a planet gear meshed with the inner gear ring for rotation, a sun gear and a first planet carrier arranged at the front end of the planet gear and rotating along with the planet gear are contained in the inner circle of the plastic package stator assembly, the outer rotor assembly is fixedly connected with the sun gear and drives the sun gear to rotate, and the center of the front end face of the first planet carrier protrudes to form an output part of the motor. The stator assembly serves as an insert, the plastic package stator assembly with the inner gear ring arranged on the inner circumference is formed through injection molding, the speed reducing mechanism is reliably connected with the motor, and the motor has the output performance of low rotating speed and large rotating torque and meanwhile has the appropriate axial height size. The invention further provides a manufacturing method of the motor with the reducing mechanism arranged on the inner circle of the plastic package stator assembly.

Description

Technical Field

[0001] The invention relates to an outer rotor motor with a speed reducing mechanism arranged on the inner circle of a plastic-sealed stator assembly and a manufacturing method thereof. The IPC classification may be H02K 7 / 10 or H02K 7 / 116. Background Art

[0002] In order to achieve a larger washing torque and a smaller height dimension, the motors currently used in washing equipment, such as washing machines and dishwashers, usually have a larger stator diameter and more winding consumables, and usually a reduction gearbox is connected to the shaft extension end of the motor to reduce the speed and increase the torque. The structure of adding a reduction gearbox to the shaft extension end of the motor undoubtedly increases the height dimension of the washing equipment.

[0003] For relevant terminology and common knowledge, please refer to the "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" (Editorial Group, Machinery Industry Press, 2nd edition 1997) and the Chinese national standard GB / T 2900.25-2008 "Electrical Terminology Rotating Electric Motors". Summary of the invention

[0004] The purpose of the present invention is to improve the problems described in the background technology and to provide an outer rotor motor with a reduction mechanism provided on the inner circle of a plastic-encapsulated stator assembly and a manufacturing method thereof. The reduction mechanism is reliably connected to the motor, the motor has a suitable height dimension, can achieve the required low speed and large torque, has a compact and firm structure and high manufacturing efficiency.

[0005] The technical solution of the present invention to solve the problem is: an electric motor with a reduction mechanism provided on the inner circle of a plastic-encapsulated stator assembly, comprising an outer rotor assembly and a stator assembly, wherein the stator assembly is used as an insert for injection molding to form a plastic-encapsulated stator assembly that covers a coil but exposes a terminal for connecting a power supply, and is characterized in that an inner circumference of the plastic-encapsulated stator assembly is provided with an inner gear ring formed by a full circle of internal teeth, the inner circle of the plastic-encapsulated stator assembly accommodates planetary gears that mesh and rotate with the inner gear ring, a sun gear, and a first planetary gear carrier that is arranged at the front end of the planetary gear and rotates with the planetary gear, a plurality of planetary gear support shafts fixed to the first planetary gear carrier, the planetary gears are rotatably sleeved on the planetary gear support shafts, the outer rotor assembly is fixed to the sun gear and drives the sun gear to rotate, and the central protrusion on the front end surface of the first planetary gear carrier forms the output part of the motor.

[0006] By using the stator assembly as an insert and injection molding to form a plastic-encapsulated stator assembly with an integrated inner gear ring on the inner circumference, the speed reduction mechanism is reliably connected to the motor, the motor has low speed and large torque output performance, and has a suitable axial height size.

[0007] Furthermore, it also includes a cylindrical reducer housing, the inner circumference of which is provided with an inner gear ring formed by a full circle of inner teeth, the reducer housing and the stator assembly are together formed by insert injection molding to form the plastic-encapsulated stator assembly, and the inner cavity of the reducer housing includes an inner gear ring exposed on the inner circumference of the plastic-encapsulated stator assembly. The plastic-encapsulated stator assembly is formed by insert injection molding of a reducer housing having an independent inner gear ring and a stator assembly. The material of the inner gear ring of the transmission component and the material of the plastic layer of the plastic-encapsulated stator assembly of the plastic-encapsulated coil can be different. The material of the inner gear ring of the transmission component can use materials with good wear resistance such as nylon, POM, etc., and the plastic layer of the plastic-encapsulated stator assembly of the plastic-encapsulated coil can use BMC material with good flame retardancy to meet different performance requirements.

[0008] Furthermore, the cylindrical outer circumferential surface of the reducer housing is circumferentially uniformly provided with radially inwardly concave first limiting grooves or radially outwardly convex fourth limiting protrusions; the inner circumferential surface of the yoke of the iron core of the stator assembly is circumferentially uniformly provided with radially protruding first limiting protrusions or radially concave fifth limiting grooves; the reducer housing and the stator assembly are insert-molded together, and the stator assembly is sleeved on the cylindrical outer circumference of the reducer housing, and the first limiting protrusion is inserted in the first limiting groove, or the fourth limiting protrusion is inserted in the fifth limiting groove. The cylindrical outer circumferential surface of the reducer housing is uniformly distributed with radially concave grooves or radially protruding protrusions, which are engaged with the inner circumferential surface of the yoke of the iron core of the stator assembly, which is uniformly distributed with radially protruding protrusions or radially concave grooves. The reducer housing is sleeved on the inner circle of the stator assembly to achieve reliable circumferential and radial limiting and reliable fixation. In particular, the reducer housing can reliably avoid deformation and displacement caused by the gear rotation torque.

[0009] Preferably, the main body of the plastic-sealed stator assembly is an annular column, the inner cavity of which is open at one end and is provided with a bottom with a middle through hole at the other end, and the middle through hole is for the output part of the motor to pass through.

[0010] Furthermore, it also includes a housing cover covering the open end of the plastic-encapsulated stator assembly, a second annular step is provided at the front center of the housing cover for accommodating the second bearing, and the rear section of the sun gear is rotatably supported by the second bearing; the end surface center of the first planetary wheel carrier facing the sun gear is concave to form an annular third step for accommodating the third bearing, and the front section of the sun gear is rotatably supported by the third bearing; the outer side of the middle through hole is provided with an annular first step for accommodating the first bearing, and the first planetary wheel carrier of the planetary reducer is rotatably supported by the first bearing. The moving parts of the reduction mechanism built into the inner circle of the plastic-encapsulated stator assembly are all rotatably supported by the bearings, reducing the running noise.

[0011] Furthermore, the first planetary wheel carrier is integrally formed with the planetary wheel support shaft and the output part. The integrated structure is simple and the transmission is reliable.

[0012] Furthermore, the outer rotor assembly includes a cylindrical retainer and magnets evenly distributed along the inner circumference of the cylindrical body, a hollow cylindrical portion is provided at the center of the bottom of the cylindrical body, an inner spline for transmission is provided on the inner circumference of the cylindrical portion, and an outer spline for transmission is provided on the outer circumferential surface of the rear section of the sun gear, and during assembly, the inner spline of the outer rotor assembly is matched and connected with the outer spline of the sun gear. The sun gear and the outer rotor assembly are fixed by splines, and the connection structure is simple.

[0013] At the same time, the present invention also provides a method for manufacturing an electric motor with a speed reduction mechanism provided on the inner circle of a plastic-encapsulated stator assembly, comprising the following steps:

[0014] S1: forming a stator assembly by winding a coil on an insulating member covering the teeth of a stator core;

[0015] S2: performing injection molding with the stator assembly as an insert to form a plastic-encapsulated stator assembly that covers the coil but exposes the terminals for connecting the power supply, and providing an inner gear ring formed by a full circle of inner teeth on the inner periphery of the plastic-encapsulated stator assembly;

[0016] S3: The planetary gears meshing with the inner gear ring, the sun gear, and the first planetary gear carrier arranged at the front end of the planetary gear and rotating with the planetary gear, and the plurality of planetary gear support shafts fixed to the first planetary gear carrier are accommodated in the inner circle of the plastic-sealed stator assembly, wherein the planetary gears are rotatably sleeved on the planetary gear support shafts, and the output part of the motor is arranged on the front end surface of the first planetary gear carrier;

[0017] S4: Arrange the outer rotor assembly outside the stator assembly and fix it to the sun gear.

[0018] Furthermore, step S2 also includes using the reducer housing as an insert during injection molding, wherein the inner circumference of the reducer housing is provided with an inner gear ring formed by a full circle of internal teeth, and after injection molding, a plastic-sealed stator assembly is formed with the inner circumference exposed outside the inner gear ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is an exploded view of an embodiment of a motor of the present invention.

[0020] Figure 2 It is an axial cross-sectional view of an embodiment of a motor of the present invention.

[0021] Figure 3 It is a schematic structural diagram of an outer rotor assembly of an electric motor embodiment of the present invention.

[0022] Figure 4 It is a schematic structural diagram of a stator assembly of an electric motor embodiment of the present invention.

[0023] Figure 5 It is a schematic structural diagram of the iron core of the stator assembly of the motor embodiment of the present invention.

[0024] Figure 6 It is a structural schematic diagram of a plastic-sealed stator assembly of an electric motor embodiment of the present invention.

[0025] Figure 7 It is a schematic structural diagram of a reducer housing of an electric motor embodiment of the present invention.

[0026] Figure 8 It is a schematic structural diagram of a motor embodiment of the present invention in which a reducer housing is sleeved on a stator assembly.

[0027] Fig. 9 It is a schematic structural diagram of the first planetary gear carrier of the motor embodiment of the present invention.

[0028] Fig.10 Schematic diagram of the structure of the sun gear of the motor embodiment of the present invention.

[0029] Fig.11 It is a step diagram of a method for manufacturing the electric motor of the present invention.

[0030] Fig.12 It is a step diagram of another method for manufacturing the motor of the present invention.

[0031] Fig.13 It is a schematic structural diagram of the iron core of a modified design embodiment of the motor of the present invention.

[0032] Fig.14 It is a schematic structural diagram of a reducer housing according to a modified design embodiment of a motor of the present invention.

[0033] Reference numerals:

[0034] Outer rotor assembly 10, retaining frame 11, magnet 12, cylindrical portion 13, stator assembly 20, iron core 21, insulating member 22, coil 23, yoke 211, first limiting protrusion 2111, first positioning groove 2112, fifth limiting groove 2113, tooth portion 212, boot portion 213, plastic-sealed stator assembly 200, bottom 2001, first step 2002, inner ring gear 101, sun gear 102, protrusion 1022, first planetary wheel carrier 103, output portion 1031, third step 1032, planetary wheel 104, reducer housing 105a, housing cover 105b, first limiting groove 1053, positioning rib 1054, fourth limiting protrusion 1059, planetary wheel support shaft 106, first bearing 107, second bearing 108. Third bearing 109. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] As shown in the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. When describing the structure of the present invention, the side where the motor output terminal is located is referred to as the front side or front end, and the opposite side is referred to as the rear side or rear side; the side adjacent to the motor rotation center is referred to as the inner side, and the opposite side is referred to as the outer side. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The electric motor of the present invention, wherein the inner circle of the plastic-sealed stator is provided with a speed reducing mechanism, is as follows Figure 1 , 2 As shown, it is mainly composed of an outer rotor assembly 10, a plastic-encapsulated stator assembly 200 formed by injection molding based on the stator assembly 20, and a reduction mechanism accommodated in the inner circle of the plastic-encapsulated stator assembly 200. The inner circumference of the plastic-encapsulated stator assembly 200 is formed with an inner gear ring 101 with a full circle of internal teeth. The outer rotor assembly 10 of the present invention is preferably sleeved on the outer circumference side of the plastic-encapsulated stator assembly 200, that is, the motor is an outer rotor motor.

[0038] The main parts structure and manufacturing method of the motor of the present invention are described in detail as follows:

[0039] The outer rotor assembly 10 of this embodiment is as follows Figure 3 As shown, the outer rotor assembly 10 includes a cylindrical retaining frame 11 and a plurality of magnets 12 evenly distributed along the circumference of the inner circumferential surface of the cylinder. A hollow cylindrical portion 13 extending axially forward is provided at the center of the bottom of the cylinder, and an inner spline for transmission is provided on the inner circumference of the cylindrical portion 13.

[0040] The stator assembly 20 of this embodiment is as follows Figure 4 , 5 As shown, the stator assembly 20 includes an iron core 21, an insulating member 22 covering the teeth of the iron core, and a coil 23 wound on the surface of the insulating member. The iron core includes an annular yoke 211 located inside, and teeth 212 protruding radially outward are evenly distributed on the outer circumference of the yoke 211, and boots 213 are formed on the outer side of each tooth extending to both sides of the circumference thereof, and the outer circumferential surface of each boot 213 is an arc surface located on the same cylinder.

[0041] The structure of the plastic-encapsulated stator assembly 200 of this embodiment is as follows: Figure 6 As shown, there are two different implementation methods.

[0042] A method for implementing a plastic-encapsulated stator assembly 200 is as follows: injection molding is performed based on the stator assembly 20 to form a plastic-encapsulated stator assembly 200 that covers the coil but exposes the terminals for connecting to a power source. The main body of the plastic-encapsulated stator assembly 200 is an annular columnar body, one end of the inner cavity of the columnar body is open, and the other end is provided with a bottom 2001 with a middle through hole, and an annular first step 2002 is provided on the outer side of the through hole for accommodating a first bearing 107. The inner cavity surface of the columnar body is formed as an inner gear ring 101 with a full circle of internal teeth, and the outer edge of the front end of the columnar body extends radially outward to form a plurality of mounting lugs 2003 for external devices, and each mounting lug 2003 is provided with a fourth through hole 2004.

[0043] Another implementation method of the plastic-encapsulated stator assembly 200 is to form the stator assembly 20 and the reducer housing 105a by injection molding. Figure 7 As shown, the reducer housing 105a is a cylindrical body, the inner cavity of which is open at one end and provided with a bottom 2001 having a middle through hole at the other end. The outer side of the through hole is provided with a first annular step 2002 for accommodating the first bearing 107. The inner cavity surface of the cylindrical body is fixed with an inner gear ring 101 with a full circle of internal teeth. The inner gear ring 101 can be an independent part fixed to the reducer housing 105a by interference fit, heat welding or other processes. Preferably, the reducer housing 105a of this embodiment is integrally injection molded with the inner gear ring 101. This structure can increase the structural stability of the inner gear ring 101. Figure 8 As shown, the reducer housing 105a is sleeved on the inner circle of the stator assembly 20, and then placed into a mold for insert injection molding to form a plastic-encapsulated stator assembly 200. Preferably, as Figure 6 As shown, a first limiting protrusion 2111 may be radially protruded from the inner circumference of the annular yoke 211 of the iron core 21 of the stator assembly 20, and the first limiting protrusions 2111 are uniformly distributed circumferentially, and a first positioning groove 2112 is provided in a first limiting protrusion 2111 to facilitate circumferential positioning of the iron core 21 during assembly; Figure 7As shown, a radially inwardly concave first limiting groove 1053 may be provided on the cylindrical outer periphery of the reducer housing 105a, and the first limiting groove 1053 is provided corresponding to the first limiting protrusion 2111. When the reducer housing 105a is sleeved on the inner circle of the stator assembly 20, the first limiting protrusion 2111 is inserted into the first limiting groove 1053 for circumferential and radial limiting. Furthermore, a positioning rib 1054 is provided protrudingly on the bottom surface of a first limiting groove 1053, and the positioning rib 1054 is aligned with the first positioning groove 2112 for circumferential positioning during assembly. The plastic part of the plastic-encapsulated stator assembly 200 covers the coil but exposes the terminals connected to the power supply. The main part of the plastic-encapsulated stator assembly 200 is an annular column, and the inner periphery of the column exposes the cylindrical inner cavity of the reducer housing 105a, including the inner gear ring 101, the bottom 2001 with the middle through hole and the first step 2002 are all exposed on the inner periphery of the plastic-encapsulated stator assembly 200. The outer edge of the front end of the column extends radially outward to form a plurality of mounting lugs 2003 for external devices, and each mounting lug 2003 is provided with a fourth through hole 2004. Of course, in other embodiments, the reducer housing 105a and the stator assembly 20 can also be placed in the mold separately as inserts and injection molded together to form the plastic-encapsulated stator assembly 200 (without pre-assembly). The plastic-encapsulated stator assembly 200 is formed in this way. The parts of the inner gear ring of the transmission component can use materials with good wear resistance such as nylon, POM, etc., while the plastic part of the plastic-encapsulated stator assembly of the plastic-encapsulated coil can use BMC material with good flame retardant properties to achieve different performance requirements.

[0044] The speed reduction mechanism of this embodiment is a planetary speed reducer. Figure 1 , 2 As shown, the planetary reducer includes an inner gear ring 101 which is integrated (fixed as one and cannot be detached) and arranged on the inner periphery of the plastic-encapsulated stator assembly 200, a sun gear 102 arranged at the center of the planetary reducer, a planetary gear 104 meshing between the sun gear 102 and the inner gear ring 101, and a first planetary wheel carrier 103 which is arranged at the front end of the planetary wheel 104 and rotates with the planetary wheel 104, four planetary wheel support shafts 106 are evenly distributed and fixed on the first planetary wheel carrier 103 in the circumferential direction, the planetary wheel 104 is rotatably sleeved on the planetary wheel support shaft 106, the rear end center of the first planetary wheel carrier 103 is concave to form an annular third step 1032 for accommodating the third bearing 109, the front end center of the first planetary wheel carrier 103 is convex to form a cylindrical body for sleeved the first bearing 107, and the front end of the cylindrical body is also provided with an output part 1031 of the motor, and in this embodiment, a spline is provided on the outer periphery of the output part 1031 for connecting with an external load. In other embodiments, the output portion 1031 may also be a conventional torque transmission connection structure such as a polygonal shaft or a flat shaft. Fig. 9As shown, the first planetary wheel carrier 103, the planetary wheel support shaft 106 and the output part 1031 are integrally formed into an integral planetary wheel carrier, which can be manufactured by conventional forming processes such as drawing and casting.

[0045] The sun gear 102 of this embodiment is as follows Fig.10 As shown, the sun gear 102 is a cylinder with a large diameter in the middle and small diameters at both ends. The transmission teeth are arranged on the outer circumference of a section with a larger diameter in the middle of the cylinder. An annular protrusion 1022 is radially protruded on the outer surface of the rear section of the cylinder with a smaller diameter adjacent to the transmission teeth. The protrusion 1022 is adapted to be installed with the inner ring of the second bearing 108; the outer circumference of the smaller diameter cylinder of the front section is sleeved with a third bearing 109 and accommodated in the third step 1032 of the first planetary wheel carrier 103, and is rotatably connected to the first planetary wheel carrier 103; the outer circumferential surface of the smaller diameter cylinder of the rear section is provided with an external spline for transmission, and the spline is correspondingly arranged with the internal spline provided on the inner circumference of the cylindrical portion 13 of the outer rotor assembly.

[0046] The planetary reducer further comprises a housing cover 105 b covering the inner opening end of the plastic-encapsulated stator assembly 200 . The housing cover 105 b is a disc-shaped rotating body. A second annular step 1052 is provided at the center of the front end of the housing cover 105 b for accommodating the second bearing 108 .

[0047] In summary, the manufacturing method of the motor of this embodiment is as follows Fig.11 As shown, the following steps are included:

[0048] S1: forming a stator assembly 20 by winding a coil 23 on an insulating member 22 covering a tooth portion 212 of a stator core 21;

[0049] S2: performing injection molding with the stator assembly 20 as an insert to form a plastic-encapsulated stator assembly 200 that covers the coil but exposes the terminals for connecting the power supply, wherein the inner circumference of the plastic-encapsulated stator assembly 200 is formed with an inner gear ring 101 having a full circle of inner teeth;

[0050] S3: The planetary gear 104 meshing with the inner gear ring 101, the sun gear 102, and the first planetary gear carrier 103 arranged at the front end of the planetary gear 104 and rotating with the planetary gear 104, and the plurality of planetary gear support shafts 106 fixed to the first planetary gear carrier 103 are accommodated in the inner circle of the plastic-encapsulated stator assembly 200, wherein the planetary gear 104 is rotatably sleeved on the planetary gear support shaft 106, and the output part 1031 of the motor is arranged at the front end center of the first planetary gear carrier 103;

[0051] S4: The outer rotor assembly 10 is arranged outside the stator assembly 20 and fixedly connected to the sun gear 102.

[0052] Furthermore, if Fig.12As shown, during the injection molding, the reducer housing 105a is also included as an insert, and the inner circumference of the reducer housing 105a is provided with an inner gear ring 101 with a full circle of internal teeth. The reducer housing 105a and the stator assembly 20 are injection molded as an insert to form a plastic-encapsulated stator assembly 200 that covers the coil but exposes the terminals for connecting the power supply, and the inner gear ring 101 is exposed on the inner circumference.

[0053] After the above-mentioned motor is manufactured, the outer rotor assembly 10 and the rear section of the sun gear 102 are rotatably connected to the reducer housing cover 105b through the second bearing 108, the first planetary carrier 103 is rotatably connected to the plastic-sealed stator assembly 200 through the first bearing 107, and the front section of the sun gear 102 is rotatably connected to the first planetary carrier 103 through the third bearing 109.

[0054] The working principle of the electric motor with a speed reduction mechanism provided on the inner circumference of the plastic-sealed stator of the present invention is as follows: when working, the plastic-sealed stator assembly 200 is fixed, the outer rotor assembly 10 rotates by electromagnetic action between the rotor magnet group 12 thereon and the coil 23 of the stator assembly 20, and the sun gear 102 rotates synchronously with the outer rotor assembly 10. At the same time, the sun gear 102 drives the planetary gear 104 to rotate by meshing with the planetary gear 104. The planetary gear 104 meshes with the inner gear ring 101 while rotating, forming an orbit around the sun gear 102, completing the speed reduction effect, and the planetary gear 104 drives the first planetary wheel carrier 103 to make a circular motion through the planetary wheel support shaft 106. The torque after deceleration is output by the output part 1031 provided on the first planetary wheel carrier 103, and finally the motor is decelerated and the output torque is increased.

[0055] The present invention can also have the following design modifications:

[0056] 1. The connection structure between the outer rotor assembly 10 and the sun gear 102 can also be fixed by a conventional connection method such as a flat shaft plus a nut;

[0057] 2. If Fig.13 , 14 As shown, a fifth limiting groove 2113 evenly distributed in the circumference may be formed radially on the inner periphery of the annular yoke 211 of the iron core 21, and a fourth limiting protrusion 1059 protruding radially outward may be provided on the cylindrical outer periphery of the reducer housing 105a. When the reducer housing 105a and the stator assembly 20 are insert-molded together, the reducer housing 105a is sleeved on the inner periphery of the stator assembly 20, and the fourth limiting protrusion 1059 is inserted into the fifth limiting groove 2113 for limiting.

[0058] 3. The number of planetary gears and planetary gear support shafts may be other numbers, such as 3, 5, etc.

[0059] The above-mentioned embodiments and design examples only express several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of protection of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the scope of protection of the present invention.

Claims

1. An outer rotor motor having a speed reducing mechanism disposed on the inner circle of a plastic-encapsulated stator assembly, comprising an outer rotor assembly (10) and a stator assembly (20), wherein the stator assembly (20) is used as an insert and injection molding is performed to form a plastic-encapsulated stator assembly (200) that covers the coil but exposes a terminal for connecting a power source, wherein the stator assembly (20) is characterized in that The inner circumference of the plastic-encapsulated stator assembly (200) is provided with an inner gear ring (101) formed by a full circle of internal teeth. The inner circumference of the plastic-encapsulated stator assembly (200) accommodates a planetary gear (104) meshing with the inner gear ring (101) and rotating, a sun gear (102), and a first planetary gear carrier (103) arranged at the front end of the planetary gear (104) and rotating with the planetary gear (104). A plurality of planetary gear support shafts (106) are fixed to the first planetary gear carrier (103). The planetary gear (104) is rotatably sleeved on the planetary gear support shaft (106). The outer rotor assembly (10) is fixedly connected to the sun gear (102) and drives the sun gear (102) to rotate. The output portion (1031) of the motor is provided at the center of the front end surface of the first planetary gear carrier (103).

2. According to claim 1, the outer rotor motor with a speed reduction mechanism provided on the inner circle of the plastic-encapsulated stator assembly is characterized in that , further comprising a cylindrical reducer housing (105a); the inner gear ring (101) is formed on the inner periphery of the reducer housing (105a) and is insert-molded together with the stator assembly (20) to form the plastic-encapsulated stator assembly (200), and is exposed on the inner periphery of the plastic-encapsulated stator assembly (200).

3. The outer rotor motor with a speed reduction mechanism provided on the inner circle of the plastic-encapsulated stator assembly according to claim 2 is characterized in that The cylindrical outer circumferential surface of the reducer housing (105a) is uniformly distributed in the circumferential direction with radially inwardly concave first limiting grooves (1053) or radially outwardly convex fourth limiting protrusions (1059); the inner circumferential surface of the yoke (211) of the iron core (21) of the stator assembly (20) is uniformly distributed in the circumferential direction with radially protruding first limiting protrusions (2111) or radially concave fifth limiting grooves (2113); when the reducer housing (105a) and the stator assembly (20) are insert-molded together, the stator assembly (20) is sleeved on the cylindrical outer circumference of the reducer housing (105), and the first limiting protrusion (2111) is inserted into the first limiting groove (1053), or the fourth limiting protrusion (1059) is inserted into the fifth limiting groove (2113).

4. An outer rotor motor with a speed reduction mechanism provided on the inner circle of the plastic-encapsulated stator assembly according to any one of claims 1 to 3, characterized in that The main body of the plastic-encapsulated stator assembly (200) is an annular column, the inner cavity of which is open at one end and has a bottom (2001) with a central through hole at the other end, and the output part (1031) of the motor passes through the central through hole.

5. The outer rotor motor with a speed reduction mechanism provided on the inner circle of the plastic-encapsulated stator assembly according to claim 4, characterized in that: It also includes a shell cover (105b) covering the open end of the plastic-sealed stator assembly (200), wherein a second annular step (1052) is provided at the center of the front end of the shell cover (105b) for accommodating a second bearing (108), and the rear section of the sun gear (102) is rotatably supported by the second bearing (108); and the center of the end surface of the first planetary wheel carrier (103) facing the sun gear is concave to form a third annular step (1032) for accommodating a third bearing (109), and the front section of the sun gear (102) is rotatably supported by the third bearing (109).

6. The outer rotor motor with a speed reduction mechanism provided on the inner circle of the plastic-encapsulated stator assembly according to claim 5, characterized in that A first annular step (2002) is provided on the outer side of the central through hole for accommodating a first bearing (107), and the first planetary wheel carrier (103) of the planetary reducer is rotatably supported by the first bearing (107).

7. The outer rotor motor with a speed reduction mechanism disposed on the inner circle of the plastic-encapsulated stator assembly according to claim 1, characterized in that: The first planetary wheel carrier (103) is integrally formed with the planetary wheel support shaft (106) and the output portion (1031).

8. The outer rotor motor with a speed reduction mechanism disposed on the inner circle of the plastic-encapsulated stator assembly according to claim 1, characterized in that: The outer rotor assembly (10) comprises a cylindrical retaining frame (11) and magnets (12) evenly distributed along the inner circumference of the cylinder. A hollow cylindrical portion (13) is provided at the center of the bottom of the cylinder. The inner circumference of the cylindrical portion (13) is provided with an internal spline for transmission. The outer circumferential surface of the rear section of the sun gear (102) is provided with an external spline for transmission. During assembly, the internal spline of the outer rotor assembly (10) is meshed and connected with the external spline of the sun gear (102).

9. A method for manufacturing an outer rotor motor with a speed reduction mechanism provided on the inner circle of a plastic-encapsulated stator assembly, characterized in that: include: S1: forming a stator assembly (20) by winding a coil (23) on an insulating member (22) covering a stator core tooth portion (212); S2: using the stator assembly (20) as an insert for injection molding to form a plastic-encapsulated stator assembly (200) that covers the coil but exposes terminals for connecting to a power source, and providing an inner gear ring (101) formed by a full circle of inner teeth on the inner circumference of the plastic-encapsulated stator assembly (200); S3: The planetary gear (104) meshing with the inner gear ring (101) and rotating, the sun gear (102), and the first planetary gear carrier (103) arranged at the front end of the planetary gear (104) and rotating with the planetary gear (104), and a plurality of planetary gear support shafts (106) fixed to the first planetary gear carrier (103) are accommodated in the inner circle of the plastic-encapsulated stator assembly (200), wherein the planetary gear (104) is rotatably sleeved on the planetary gear support shaft (106), and the output part (1031) of the motor is arranged on the front end surface of the first planetary gear carrier (103); S4: The outer rotor assembly (10) is arranged outside the stator assembly and fixedly connected to the sun gear (102).

10. The method for manufacturing an outer rotor motor having a speed reduction mechanism disposed on the inner circumference of a plastic-encapsulated stator assembly according to claim 9, characterized in that Step S2 also includes using the reducer housing (105a) as an insert during injection molding, wherein the inner circumference of the reducer housing (105a) is provided with an inner gear ring (101) formed by a full circle of internal teeth, and after injection molding, a plastic-encapsulated stator assembly (200) is formed with the inner gear ring (101) exposed outside the inner circumference.

Images