External rotor motor

Abstract

The present invention provides an outer rotor motor comprising a stator and an outer rotor. The stator comprises a stator seat and a magnetic conductive assembly. The stator seat comprises a metal portion and a plastic portion injection-molded onto the metal portion. The metal portion comprises a cylindrical portion and an end portion. The metal portion is provided with a coupling hole. The plastic portion comprises a base portion that fills the coupling hole and an axial circumferential positioning portion that protrudes from the outer side of the cylindrical portion. The magnetic conductive assembly is provided with a mating cavity. The inner wall of the mating cavity is provided with an axial circumferential positioning groove. The cylindrical portion is mated in the mating cavity, and the circumferential positioning portion is axially embedded in the circumferential positioning groove. The structure of this outer rotor motor is highly reliable and can be manufactured using a stretching and injection molding process, which improves production efficiency and saves costs.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an outer rotor motor. Background Art

[0002] Depending on the relative position of the stator and rotor, motors can be divided into two categories: inner rotor and outer rotor. In an inner rotor motor, the rotor is surrounded by the stator, meaning the rotor is inside. In an outer rotor motor, the rotor surrounds the stator, meaning the rotor is outside.

[0003] In traditional solutions, the stator seats in many external rotor motors adopt a casting + machining process, that is, the blank is cast and then machined. This traditional solution has low manufacturing efficiency and high cost. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an outer rotor motor with a structure that is easy to manufacture, in view of the above-mentioned defects in the related art.

[0005] The technical solution adopted by the present invention to solve its technical problems includes: providing an outer rotor motor, including a stator and an outer rotor, the outer rotor including a housing, a magnet provided on the housing, and a rotating shaft connected to the housing, the stator including a stator seat and a magnetic conductive assembly, the stator seat including a metal portion and a plastic portion injection molded on the metal portion, the metal portion including a cylindrical portion and an end portion provided at one axial end of the cylindrical portion, the cylindrical portion being parallel to the rotating shaft, and the rotating shaft penetrating into a hollow inner cavity of the cylindrical portion;

[0006] The metal part is provided with a combining hole, the plastic part includes a base filled in the combining hole and an axial circumferential positioning part protruding from the outside of the cylindrical part, the magnetic conductive component is provided with a matching cavity, the inner wall of the matching cavity is provided with an axial circumferential positioning groove, the cylindrical part is matched in the matching cavity and the circumferential positioning part is axially embedded in the circumferential positioning groove.

[0007] Preferably, the coupling hole is provided on the cylindrical portion and is an axial groove, and the base portion fills the coupling hole and extends outward to form the circumferential positioning portion.

[0008] Preferably, one end of the circumferential positioning portion facing the magnetic conductive component is provided with a chamfer.

[0009] Preferably, the number of the circumferential positioning portions is one, or there are multiple circumferentially evenly distributed positioning portions.

[0010] Preferably, the plastic part includes a stator seat outer positioning step provided on the outside of the cylindrical part, and the stator seat outer positioning step is provided on the axial side of the circumferential positioning part. A magnetic conductive component inner positioning step is provided on the inner side of the matching cavity of the magnetic conductive component, so that the circumferential positioning part is axially embedded in the circumferential positioning groove and the stator seat outer positioning step is against the magnetic conductive component inner positioning step to axially position the magnetic conductive component.

[0011] Preferably, the outer rotor motor includes a first bearing, the coupling hole radially penetrates the cylindrical portion, the base forms a first inner positioning step of the stator seat on the inner side of the cylindrical portion, the rotating shaft cooperates with the first bearing, the first bearing is arranged in the hollow inner cavity of the cylindrical portion from the opening at one end of the cylindrical portion, and the axial direction abuts against the first inner positioning step of the stator seat to axially position the first bearing.

[0012] Preferably, a supporting step is provided on the outer side of the cylindrical portion, and the supporting step is axially opposed to the outer positioning step of the stator seat to axially support the outer positioning step of the stator seat.

[0013] Preferably, the supporting step is formed by bending the cylindrical portion.

[0014] Preferably, the outer rotor motor includes a second bearing, a second inner positioning step of the stator seat is formed on the inner side of the cylindrical portion, the rotating shaft cooperates with the second bearing, and the second bearing is arranged in the hollow inner cavity of the cylindrical portion from the opening at one end of the cylindrical portion, and axially abuts against the first inner positioning step of the stator seat to axially position the first bearing.

[0015] Preferably, the stator seat outer positioning step is formed by bending the cylindrical portion.

[0016] Preferably, the metal part is formed by stretching, drawing or calendaring.

[0017] Preferably, the end portion of the metal portion is in the shape of a radially extending disk.

[0018] The implementation of the technical solution of the present invention has at least the following beneficial effects: the structure of the outer rotor motor has high reliability while being conducive to improving production efficiency and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] Figure 1 It is a perspective view of an outer rotor motor according to one embodiment of the present invention.

[0021] Figure 2 yes Figure 1Exploded diagram of an outer rotor motor.

[0022] Figure 3 yes Figure 1 Exploded diagram of an outer rotor motor (outer rotor omitted).

[0023] Figure 4 yes Figure 1 Another perspective view of the outer rotor motor.

[0024] Figure 5 yes Figure 4 Exploded diagram of an outer rotor motor.

[0025] Figure 6 yes Figure 4 Exploded diagram of an outer rotor motor (outer rotor omitted).

[0026] Figure 7 yes Figure 6 A three-dimensional view of the metal part of the stator base.

[0027] Figure 8 yes Figure 4 Exploded view of an outer rotor motor in a cross-sectional state (outer rotor omitted).

[0028] Figure 9 yes Figure 8 A partial enlarged view of area A in the middle.

[0029] The numbers in the figure indicate: stator 1, stator seat 11, metal part 111, cylindrical part 1111, coupling hole 11111, second inner positioning step 11112 of stator seat, supporting step 11113, end 1112, plastic part 112, base 1121, circumferential positioning part 1122, chamfer 11221, outer positioning step 1123 of stator seat, first inner positioning step 1124 of stator seat, magnetic conductive component 12, matching cavity 121, circumferential positioning groove 122, inner positioning step 123 of magnetic conductive component, first bearing 13, second bearing 14, outer rotor 2, housing 21, magnet 22, rotating shaft 23. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. It should be understood that if the "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail" and other indications of orientation or positional relationship appear in the text, they are based on the orientation or positional relationship shown in the drawings, constructed and operated in a specific orientation, and are only for the convenience of describing the present technical solution, and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be understood as limiting the present invention. It should also be noted that unless otherwise expressly specified and limited, if the terms "installed", "connected", "connected", "fixed", "set" and the like appear in the text, they should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be directly connected, or indirectly connected through an intermediate medium, and can be internal communication between two elements or an interactive relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or one or more intervening elements may be present. If the terms "first," "second," "third," etc. appear in this document, they are merely for the purpose of describing the technical solution and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first," "second," "third," etc. may explicitly or implicitly include one or more of such features. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0032] See also Figure 1-9 In one embodiment of the present invention, an outer rotor motor includes a stator 1 and an outer rotor 2. The outer rotor 2 includes a housing 21, a magnet 22 provided on the housing 21, and a rotating shaft 23 connected to the housing 21. The stator 1 includes a stator base 11, a magnetic conductive component 12, and a winding wound on the magnetic conductive component 12. The stator base 11 includes a metal portion 111 and a plastic portion 112 injection-molded on the metal portion 111. The metal portion 111 includes a cylindrical portion 1111 and an end portion 1112 provided at one axial end of the cylindrical portion 1111. The cylindrical portion 1111 is parallel to the rotating shaft 23, and the rotating shaft 23 penetrates into the hollow inner cavity of the cylindrical portion 1111.

[0033] The metal portion 111 is provided with a coupling hole 11111. The plastic portion 112 includes a base portion 1121 that fills the coupling hole 11111 and an axial circumferential positioning portion 1122 that protrudes from the outside of the cylindrical portion 1111. The magnetic conductive component 12 is provided with a mating cavity 121, the inner wall of which is provided with an axial circumferential positioning groove 122. The cylindrical portion 1111 is mated in the mating cavity 121, and the circumferential positioning portion 1122 is axially embedded in the circumferential positioning groove 122. This strengthens the torsional resistance of the stator 1 and enhances reliability. This design not only improves the stability of part tolerances, but also saves costs and greatly improves production efficiency. It represents a new design concept and manufacturing process.

[0034] Preferably, see Figure 7-9 The coupling hole 11111 is provided on the cylindrical portion 1111 and is an axial groove. The base 1121 of the plastic portion 112 fills the coupling hole 11111 and extends outward to form a circumferential positioning portion 1122 .

[0035] Preferably, see Figure 9 The end of the circumferential positioning portion 1122 facing the magnetic conductive component 12 is provided with a chamfer 11221 so that the circumferential positioning portion 1122 can be embedded in the circumferential positioning groove 122 of the magnetic conductive component 12 during assembly.

[0036] Preferably, the number of the circumferential positioning portions 1122 is one, or multiple and evenly distributed circumferentially. For example, when the number of the circumferential positioning portions 1122 is two, they are evenly distributed 180 degrees (see Figure 1-9 ), the three are evenly distributed at 120 degrees.

[0037] Preferably, the plastic part 112 includes a stator seat outer positioning step 1123 surrounding the axis and arranged on the outside of the cylindrical part 1111. The stator seat outer positioning step 1123 is arranged on one axial side of the circumferential positioning part 1122 and is connected to one end of the circumferential positioning part 1122. A magnetic component inner positioning step 123 is provided on the inner side of the mating cavity 121 of the magnetic component 12, so that the circumferential positioning part 1122 is axially embedded in the circumferential positioning groove 122 and the stator seat outer positioning step 1123 is against the magnetic component inner positioning step 123 to axially position the magnetic component 12.

[0038] Preferably, the outer rotor motor includes a first bearing 13, the plastic part 112 is formed as a whole by injection molding, the coupling hole 11111 radially penetrates the cylindrical part 1111, and the base 1121 of the plastic part 112 forms a first inner positioning step 1124 of the stator seat surrounding the axis on the inner side of the cylindrical part 1111. The rotating shaft 23 cooperates with the first bearing 13 to facilitate the rotation of the outer rotor 2. The first bearing 13 is arranged in the hollow inner cavity of the cylindrical part 1111 from the opening at one end of the cylindrical part 1111, and axially presses against the first inner positioning step 1124 of the stator seat to axially position the first bearing 13.

[0039] Preferably, a support step 11113 surrounding the axis is provided on the outside of the cylindrical portion 1111, and the support step 11113 axially abuts against the stator seat outer positioning step 1123 to axially support the stator seat outer positioning step 1123. The support step 11113 is formed by bending the cylindrical portion 1111.

[0040] Preferably, the outer rotor motor includes a second bearing 14. A second inner positioning step 11112 of the stator seat is formed inside the cylindrical portion 1111 of the metal part 111. The rotating shaft 23 cooperates with the second bearing 14 to facilitate the rotation of the outer rotor 2. The second bearing 14 is fitted into the hollow inner cavity of the cylindrical portion 1111 through an opening at one end of the cylindrical portion 1111 and axially abuts against the first inner positioning step 1124 of the stator seat to axially position the first bearing 13. The stator seat outer positioning step 1123 is formed by bending the cylindrical portion 1111.

[0041] Preferably, the metal portion 111 is formed by stretching, drawing or rolling. The end portion 1112 of the metal portion 111 is in the shape of a radially extending disk.

[0042] Preferably, the magnetic conductive component 12 may include a plastic base frame and a magnetic conductive metal block disposed on the plastic base frame for conducting a magnetic field, and the winding is wound around the magnetic conductive component 12 .

[0043] Preferably, the manufacturing process of the stator seat 11 specifically includes:

[0044] 1. Before injection molding, the metal portion 111 of the stator seat 11 is stretched (or drawn or rolled), and then the metal portion 111 is placed in an injection mold, and the plastic portion 112 is injection molded on the metal portion 111 .

[0045] 2. Stretching and injection molding features must be strictly formed according to design requirements.

[0046] 3. When the stator seat 11 is inserted into the magnetic conductive component 12, the chamfer 11221 of the circumferential positioning portion 1122 of the plastic portion 112 of the stator seat 11 is guided and pressed into the circumferential positioning groove 122 of the magnetic conductive component 12. The circumferential positioning portion 1122 cooperates with the circumferential positioning groove 122 to increase the torsional force of the stator 1. The internal positioning step 123 of the magnetic conductive component is completely fitted with the external positioning step 1123 of the stator seat. The surface of the external positioning step 1123 of the stator seat can be made without chamfer at the bottom by injection molding.

[0047] 4. The first inner positioning step 1124 of the stator seat fits against the first bearing 13 to limit the axial movement of the first bearing 13 .

[0048] 5. The second inner positioning step 11112 of the stator seat fits against the second bearing 14 to limit the axial movement of the second bearing 14.

[0049] In summary, the structure of the stator base 11 of the outer rotor motor of the present invention embodies a novel design concept and can be fabricated using a completely new manufacturing process. The circumferential positioning of the stator base 11 provides enhanced reliability and torque resistance, while various axial positioning structures enable precise positioning of various components. This design not only improves component tolerance stability but also reduces costs and significantly improves production efficiency.

[0050] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications, combinations, and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. An outer rotor motor, characterized in that: The invention comprises a stator (1) and an outer rotor (2), wherein the outer rotor (2) comprises a housing (21), a magnet (22) arranged on the housing (21), and a rotating shaft (23) connected to the housing (21); the stator (1) comprises a stator seat (11) and a magnetic conductive component (12); the stator seat (11) comprises a metal part (111) and a plastic part (112) formed on the metal part (111) by injection molding; the metal part (111) comprises a cylindrical part (1111) and an end part (1112) arranged at one axial end of the cylindrical part (1111); the cylindrical part (1111) is parallel to the rotating shaft (23); and the rotating shaft (23) penetrates into the hollow inner cavity of the cylindrical part (1111); The metal part (111) is provided with a coupling hole (11111), the plastic part (112) includes a base (1121) filled in the coupling hole (11111) and an axial circumferential positioning portion (1122) protruding from the outside of the cylindrical part (1111), the magnetic conductive component (12) is provided with a matching cavity (121), the inner wall of the matching cavity (121) is provided with an axial circumferential positioning groove (122), the cylindrical part (1111) is matched in the matching cavity (121), and the circumferential positioning portion (1122) is axially embedded in the circumferential positioning groove (122).

2. The outer rotor motor according to claim 1, characterized in that The coupling hole (11111) is provided on the cylindrical portion (1111) and is an axial groove. The base portion (1121) fills the coupling hole (11111) and extends outward to form the circumferential positioning portion (1122).

3. The outer rotor motor according to claim 1, characterized in that An end of the circumferential positioning portion (1122) facing the magnetic conductive component (12) is provided with a chamfer (11221).

4. The outer rotor motor according to claim 1, characterized in that The number of the circumferential positioning parts (1122) is one, or multiple and evenly distributed around the circumference.

5. The outer rotor motor according to claim 1, characterized in that The plastic part (112) includes a stator seat outer positioning step (1123) arranged on the outside of the cylindrical part (1111), and the stator seat outer positioning step (1123) is arranged on the axial side of the circumferential positioning part (1122). The magnetic component inner positioning step (123) is provided on the inner side of the matching cavity (121) of the magnetic component (12) so that the circumferential positioning part (1122) can be axially embedded in the circumferential positioning groove (122) and the stator seat outer positioning step (1123) abuts against the magnetic component inner positioning step (123) to axially position the magnetic component (12).

6. The outer rotor motor according to claim 1, characterized in that The outer rotor motor includes a first bearing (13), the coupling hole (11111) radially penetrates the cylindrical portion (1111), the base (1121) forms a first inner positioning step (1124) of the stator seat on the inner side of the cylindrical portion (1111), the rotating shaft (23) cooperates with the first bearing (13), and the first bearing (13) is arranged in the hollow inner cavity of the cylindrical portion (1111) from an opening at one end of the cylindrical portion (1111) and axially abuts against the first inner positioning step (1124) of the stator seat to axially position the first bearing (13).

7. The outer rotor motor according to claim 5, characterized in that A supporting step (11113) is provided on the outside of the cylindrical portion (1111), and the supporting step (11113) is axially opposed to the stator seat outer positioning step (1123) to axially support the stator seat outer positioning step (1123).

8. The outer rotor motor according to claim 7, characterized in that The supporting step (11113) is formed by bending the cylindrical portion (1111).

9. The outer rotor motor according to claim 6, characterized in that The outer rotor motor includes a second bearing (14), a second inner positioning step (11112) of the stator seat is formed on the inner side of the cylindrical portion (1111), the rotating shaft (23) is matched with the second bearing (14), and the second bearing (14) is matched with the hollow inner cavity of the cylindrical portion (1111) from the opening at one end of the cylindrical portion (1111) and axially abuts against the first inner positioning step (1124) of the stator seat to axially position the first bearing (13).

10. The outer rotor motor according to claim 5, characterized in that The stator seat outer positioning step (1123) is formed by bending the cylindrical portion (1111).

11. The outer rotor motor according to any one of claims 1 to 10, characterized in that: The metal portion (111) is formed by stretching, drawing or rolling.

12. The outer rotor motor according to claim 1, characterized in that The end portion (1112) of the metal portion (111) is in the shape of a radially extending disk.

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