Stator for external rotor motor and external rotor motor

Abstract

The utility model relates to the technical field of motors, in particular to a stator for an external rotor motor, and the stator comprises a plurality of coils which are distributed at intervals along the circumferential direction of the stator, and magnetic conductive stator teeth which are respectively installed in each coil. And a first support plate and a second support plate, in which the first support plate and the second support plate are arranged at both sides of the stator teeth so as to face each other in the axial direction of the stator, and fix the coil between the first support plate and the second support plate. The utility model also relates to a corresponding external rotor motor. Through some embodiments of the present application, the stator teeth and the coil can be fixed by using the two support plates, and the stator and the rotor are allowed to form an axial magnetic flux structure, and in addition, the stator teeth can be connected to the support plates by simply relying on the mounting shell, and the coil can be wound by relying on the mounting shell. And a modularized stator structure and a modularized stator assembly mode are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to a stator for an outer rotor electric machine and a corresponding outer rotor electric machine. BACKGROUND

[0002] In the field of electric vehicles and many devices requiring electric machine driving, wheel hub motors play a very important role. At present, the commonly seen wheel hub motors on the market mostly adopt a radial flux structure.

[0003] An outer rotor electric machine is an electric machine with a rotor located at the periphery of the electric machine and rotating around a stator. Generally, the stator is composed of a core and a coil winding, the core is generally composed of silicon steel sheets laminated together to provide support for the winding, and the winding is the key to realizing the conversion of electric energy and magnetic energy and can generate a magnetic field after passing through an electric current. The rotor includes a magnetic conducting portion and permanent magnets, the permanent magnets can be magnetically coupled with the stator core, and the magnetic conducting portion magnetically connects the permanent magnets.

[0004] For an outer rotor electric machine, there is still room for improvement in terms of structural arrangement and machine performance. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to propose an improved stator for an outer rotor electric machine, which has at least one of optimized structure, assembly method and working efficiency.

[0006] According to a first aspect of the present application, a stator for an outer rotor electric machine is provided, the stator comprising: a plurality of coils spaced apart along a circumferential direction of the stator and a magnetic conducting stator tooth respectively installed in each of the coils; and a first support plate and a second support plate, wherein the first support plate and the second support plate are arranged at both sides of the stator teeth in an axial direction of the stator opposite to each other, and the coils are fixed between the first support plate and the second support plate.

[0007] According to an optional embodiment, a receiving portion is provided on a side of the first support plate facing the second support plate, and a connecting member is used to fixedly connect the first support plate and the second support plate to each other through the receiving portion.

[0008] According to an optional embodiment, the first support plate and the second support plate respectively have a plurality of radial portions extending in a radial direction, and a hollow portion is formed between adjacent two radial portions, and the plurality of stator teeth are at least partially exposed through the corresponding hollow portions in the axial direction.

[0009] According to an optional embodiment, the stator further comprises a plurality of mounting shells, each of the mounting shells fixedly bearing one of the stator teeth, and each of the mounting shells having a coil wound on an outer circumferential surface thereof, wherein the mounting shells are respectively connected to the first support plate and the second support plate.

[0010] According to an optional embodiment, the mounting shells are configured to space the coils apart from the stator teeth and / or insulate the coils from the stator teeth.

[0011] According to an optional embodiment, the mounting shells are formed of an insulating plastic.

[0012] According to an optional embodiment, the coils form a plurality of turns side by side in an axial direction of the stator on the outer circumferential surface of the mounting shells.

[0013] According to an optional embodiment, the mounting shells have a first shell end connected to the first support plate, a second shell end connected to the second support plate, and an intermediate shell portion between the first shell end and the second shell end, wherein the first shell end and the second shell end protrude from the intermediate shell portion in a circumferential direction of the intermediate shell portion, and the coils are wound over the entire intermediate shell portion.

[0014] According to an optional embodiment, the stator teeth have a first tooth end, a second tooth end, and an intermediate tooth portion between the first tooth end and the second tooth end, wherein the first tooth end and the second tooth end protrude from the intermediate tooth portion in a circumferential direction of the stator.

[0015] According to an optional embodiment, an outer surface of the intermediate tooth portion and an inner surface of the mounting shells are in abutment with each other.

[0016] According to an optional embodiment, the first tooth end and the second tooth end extend beyond the first shell end and the second shell end in an axial direction of the stator, such that the mounting shells clamp the stator teeth in the axial direction via the first shell end and the second shell end.

[0017] According to an optional embodiment, the first tooth end and the second tooth end respectively extend to be flush with or beyond an outer surface of the first support plate and the second support plate in the axial direction.

[0018] According to an optional embodiment, the first shell end and the second shell end are respectively provided with a connecting portion adapted to be inserted into the first support plate and the second support plate.

[0019] According to an optional embodiment, the connection portions are inserted into the cutouts of the first support plate and the second support plate, respectively, such that a single mounting shell corresponds to a single cutout of the first support plate and the second support plate.

[0020] According to an optional embodiment, the connection portions are implemented as protrusions protruding outwardly from the first shell end or the second shell end in the axial direction of the stator.

[0021] According to an optional embodiment, the connection portions are implemented as a substantially U-shaped structure.

[0022] According to an optional embodiment, two adjacent connection portions from two adjacent mounting shells, respectively, sandwich a same radial portion of the first support plate or the second support plate.

[0023] According to an optional embodiment, the mounting shell has an opening through which the stator tooth is placed within the mounting shell, the mounting shell having a stop portion in a region adjacent to the opening, the stop portion being adapted to fix the stator tooth within the mounting shell in the radial direction of the stator.

[0024] According to an optional embodiment, the stop portion is provided on inner surfaces of the mounting shell opposite to each other.

[0025] According to an optional embodiment, the stop portion is implemented as a hook adapted to be hooked onto an end face of the stator tooth.

[0026] According to an optional embodiment, the stop portion is formed integrally with the mounting shell.

[0027] According to an optional embodiment, the stop portion and end portions of the first shell end and the second shell end defining the opening are spaced apart in the radial direction of the stator such that the coil is spaced apart from the stator tooth at the opening.

[0028] According to an optional embodiment, the stop portion has a triangular cross section, and a hypotenuse of the triangle of the cross section is closer to the opening than a base.

[0029] According to a second aspect of the present application, there is provided an external rotor electric machine comprising a rotor and a stator according to any of the present application.

[0030] According to an optional embodiment, the rotor is rotatable relative to the stator about a central axis of the stator extending in the axial direction of the stator, the rotor having a permanent magnet, the stator tooth and the permanent magnet having a magnetic gap therebetween in the axial direction.

[0031] According to an optional embodiment, the stator is fixedly sleeved on a mandrel, the rotor is relatively rotatably sleeved on the mandrel, and the mandrel is arranged along the axial direction of the stator.

[0032] According to an optional embodiment, the external rotor motor comprises two rotors respectively located at two sides of the stator.

[0033] According to certain embodiments of the present application, two support plates can be utilized to fix the coils and the stator teeth and allow the stator and the rotor to form an axial flux structure. In addition, the stator teeth can be connected to the support plates on both sides simply by means of the mounting shell, and the stator teeth do not need to be directly connected between the stator teeth and the support plates, thereby realizing a modular stator structure and a modular stator assembly method, simplifying the installation, and facilitating the replacement operation for a single stator tooth or a single assembly. In addition, the coils can be wound simply by means of the mounting shell, thereby providing support for the coils, and the coils can be wound individually for each stator tooth, so that the current parameters on each stator tooth can be flexibly adjusted, thereby enabling the motor to meet the fine application requirements. BRIEF DESCRIPTION OF DRAWINGS

[0034] The principles, features and advantages of the present application can be better understood by referring to the following detailed description of the application, taken in conjunction with the accompanying drawings. In the drawings:

[0035] Figure 1 A perspective view of a stator according to an embodiment of the present application is shown;

[0036] Figure 2 An exploded view of the stator in Figure 1 is shown;

[0037] Figure 3 An exploded view of an assembly of a mounting shell, a stator tooth and a coil of the stator in Figure 1 is shown;

[0038] Figure 4 A perspective view, a side view and a sectional view of the assembly in Figure 3 are shown;

[0039] Figure 5 A front view, a side view, a sectional view and a partial enlarged view of the mounting shell in Figure 3 are shown; and

[0040] Figure 6 An exploded view of an external rotor motor according to an embodiment of the present application is shown.

[0041] LIST OF REFERENCE NUMERALS

[0042] 1 stator

[0043] 11 Stator teeth

[0044] 111 First tooth tip

[0045] 112 Second tooth tip

[0046] 113 Intermediate teeth

[0047] 114 Outer surface

[0048] 12 Mounting Case

[0049] 121 First shell end

[0050] 122 Second shell end

[0051] 123 Intermediate Shell

[0052] 124 Connecting part

[0053] 125 Opening

[0054] 126 Inner Surface

[0055] 127 Stop section

[0056] 13 coils

[0057] 14 First Support Plate

[0058] 15 Second support plate

[0059] 141, 151 Radial section

[0060] 142, 152 Openwork sections

[0061] 143 Receiving Department

[0062] 144, 154 outer surfaces

[0063] X-axis direction

[0064] Y radial direction

[0065] 10 External rotor motor

[0066] 2 rotors

[0067] 21. Magnetic structure

[0068] 22 permanent magnet

[0069] 3. Housing

[0070] 4 End Caps

[0071] 5 spindles Detailed Implementation

[0072] To make the technical problems, technical solutions, and beneficial technical effects to be solved by this application clearer, the following will provide a more detailed description of this application in conjunction with the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining the principles of this application and are not intended to limit the scope of protection of this application. In the various drawings of this application, features with the same structure or similar function are represented by the same reference numerals. Furthermore, in the various drawings of the application, corresponding components or elements are shown at different angles in the same coordinate system.

[0073] like Figures 1 to 3 As shown, the stator 1 for an external rotor motor according to an embodiment of this application includes a plurality of coils 13 spaced circumferentially along the stator 1 and magnetically conductive stator teeth 11 respectively mounted in each coil 13. Current can flow through the coils 13 to generate a magnetic field. The stator teeth 11 are preferably laminates formed by stacking layers of ferrite sheet material. That is, the stator 1 includes a plurality of stator teeth 11, each stator tooth 11 corresponding to a coil 13, and the plurality of coils 13 and the plurality of stator teeth 11 are arranged circumferentially around the central axis of the stator 1 (i.e., along the axial direction X). Here and in the following text, the axial direction X of the stator 1 can also be the axial direction of the external rotor motor 10.

[0074] The stator 1 also includes a first support plate 14 and a second support plate 15. The two support plates 14 and 15 are arranged opposite each other on both sides of the stator tooth 11 along the axial direction X of the stator 1, and the coil 13 is fixed between the first support plate 14 and the second support plate 15.

[0075] Therefore, two support plates can be used to fix the stator teeth and coils, and the coils can be fixed between the support plates at both ends, thus completing the stator assembly. The addition of support plates can effectively enhance the structural stability of the stator, ensure the accurate positioning of the stator teeth and coils, and also simplify the structure.

[0076] Optionally, such as Figure 2 As shown, a receiving portion 143 may be provided on the side of the first support plate 14 facing the second support plate 15. The receiving portion 143 allows a connector S (e.g., a screw) to be inserted and secured, thereby enabling the first support plate 14 and the second support plate 15 to be fixedly connected to each other via the connector S through the receiving portion 143. This advantageously and simply achieves the relative fixation of the support plates and, consequently, the fixation of the stator teeth.

[0077] Optionally, such as Figure 2As shown, the first support plate 14 and the second support plate 15 may each have a plurality of radial portions 141 and 151 extending along the radial direction Y of the stator 1, and hollow portions 142 and 152 are formed between adjacent radial portions 141 and 151. Each hollow portion 142 and 152 corresponds to one of the plurality of stator teeth 11. In particular, the plurality of stator teeth 11 are at least partially exposed along the axial direction X through the corresponding hollow portions 142 and 152. In this way, the portions of the stator teeth 11 exposed from the hollow portions 142 and 152 of the first support plate 14 and the second support plate 15 can be magnetically coupled to the rotor located outside the stator 1 to drive the rotor to rotate.

[0078] Optionally, such as Figures 1 to 3 As shown, the stator 1 may further include multiple mounting shells 12, each mounting shell 12 fixedly supporting one stator tooth 11, i.e., each stator tooth 11 is equipped with one mounting shell 12. Furthermore, the coil 13 is wound around the outer peripheral surface of each mounting shell 12. Advantageously, the mounting shells 12 are respectively connected to the first support plate 14 and the second support plate 15. Thus, unlike the prior art where the stator tooth is directly fixed to the support plate (e.g., by welding or threaded connection), according to this application, the connection of the stator tooth 11 to the two support plates 14, 15 can be achieved through the mounting shells 12, while the support and fixation of the coil 13 can also be achieved through the mounting shells 12, which advantageously realizes the simple assembly of the stator 1. Additionally, since each mounting shell 12 individually supports the corresponding stator tooth 11 and coil 13, it is possible to allow the stator tooth 11, coil 13, and mounting shell 12 to form an assembly, and then individually connect each assembly to the two support plates 14, 15, thereby advantageously realizing a modular stator structure and a modular stator assembly method.

[0079] Preferably, the mounting housing 12 can be configured to space the coil 13 and stator teeth 11 apart and / or insulate them from each other. For example, the mounting housing 12 can be made of an insulating material. Preferably, the mounting housing 12 can be formed of an insulating plastic. This provides insulation for supporting the stator teeth 11 and the coil 13. Additionally or alternatively, the mounting housing 12 can be configured to space the coil 13 and stator teeth 11 apart. This prevents short circuits caused by contact between the coil 13 and stator teeth 11, even if the protective layer of the coil 13 fails, thus improving the safety of the stator 1. The coil 13 can be wound from round or square flat wire.

[0080] Additionally, preferably, such as Figure 1 and Figure 2As shown, coil 13 can be formed on the outer peripheral surface of mounting housing 12 with multiple turns arranged side-by-side along the axial direction X of stator 1. This winding method is particularly suitable for external rotor motors with axial flux structures. Compared to radial flux structures, axial flux structures allow for a reduction in stator volume and weight (especially a reduction in the axial dimension of the stator) while maintaining the same power output, or can provide greater power without changing the stator dimensions. This improves material utilization, increases structural compactness, and enhances the motor's torque / power density and efficiency.

[0081] like Figure 3 As shown, the mounting housing 12 may have a first housing end 121 connected to the first support plate 14, a second housing end 122 connected to the second support plate 15, and an intermediate housing portion 123 located between the first housing end 121 and the second housing end 122. The first housing end 121 and the second housing end 122 may protrude from the intermediate housing portion 123 in a circumferential direction, and the coil 13 may be wound around the entire intermediate housing portion 123. Thus, a groove for receiving the coil 13 can be formed between the protruding first housing end 121 and the second housing end 122 and the intermediate housing portion 123, so that the coil 13 can be fixed between the first housing end 121 and the second housing end 122 in the axial direction X of the stator 1.

[0082] Same reference Figure 3 The stator teeth 11 may have a first tooth end 111, a second tooth end 112, and a middle tooth portion 113 located in the middle, and the first tooth end 111 and the second tooth end 112 protrude to both sides of the middle tooth portion 113 in the circumferential direction of the stator 1. That is, the stator teeth 11 generally have a roughly "I" shaped structure. Each of the plurality of stator teeth 11 of the stator 1 may have a shape that gradually widens from the inner end adjacent to the central axis of the stator 1 to the outer end away from the central axis of the stator 1. The individual stator teeth 11 are independent of each other and there is no connection between them.

[0083] Optionally, in the assembly formed by the stator teeth 11, the coil 13 and the mounting housing 12, the outer surface 114 of the middle tooth portion 113 of the stator teeth 11 and the inner surface 126 of the mounting housing 12 are in contact with each other, thereby improving the load-bearing capacity of the mounting housing 12 on the stator teeth 11.

[0084] Alternatively or additionally, the first tooth end 111 and the second tooth end 112 may extend into a first shell end 121 and a second shell end 122 along the axial direction X of the stator 1, so that the mounting shell 12 secures the stator teeth 11 along the axial direction X through the first shell end 121 and the second shell end 122. Thus, the "I"-shaped structure of the stator teeth 11 can be fully utilized to construct the mounting shell 12 in a shape-fitting manner, thereby achieving the fixation of the stator teeth 11 in the corresponding direction solely through the shape construction of the mounting shell 12.

[0085] Additionally or alternatively, the first tooth end 111 and the second tooth end 112 can respectively extend along the axial direction X to be flush with or beyond an outer surface 144 of the first support plate 14 (not visible in Figure 2 Fig. 1) and an outer surface 154 of the second support plate 15. In this way, the magnetic coupling of the stator teeth 11 to the rotor can be facilitated. In this way, the outermost end faces of the first tooth end 111 and the second tooth end 112 can be completely exposed from the first support plate 14 and the second support plate 15 and face the rotor, which facilitates an enhanced magnetic coupling effect, an optimized magnetic field distribution and an increased motor efficiency.

[0086] With regard to the cooperation with the first support plate 14 and the second support plate 15, the first housing end 121 and the second housing end 122 can respectively be provided with a connection portion 124 adapted to be plugged into the first support plate 14 and the second support plate 15, as shown in Figure 3 Fig. 1. The connection portion 124 can be plugged into the hollow portion 142 of the first support plate 14 and the hollow portion 152 of the second support plate 15, respectively, i.e. the connection portion 124 on the first housing end 121 of the mounting housing 12 can be plugged into the hollow portion 142 of the first support plate 14 and the connection portion 124 on the second housing end 122 of the mounting housing 12 can be plugged into the hollow portion 152 of the second support plate 15. Thereby, a single mounting housing 12 can correspond to a single hollow portion 142, 152 of the first support plate 14 and the second support plate 15. In other words, each hollow portion 142, 152 can receive an assembly of a stator tooth 11, a mounting housing 12 and a coil 13.

[0087] Preferably, the connection portion 124 can be embodied as a protrusion protruding outwardly from the first housing end 121 or the second housing end 122 along the axial direction X of the stator 1. Additionally or alternatively, the connection portion 124 can be embodied as a substantially U-shaped structure. Additionally or alternatively, adjacent two connection portions 124 from adjacent two mounting housings 12 can sandwich a same radial portion 141 of the first support plate 14 or a same radial portion 151 of the second support plate 15, respectively. Thereby, the mounting housing 12, the support plates 14 and 15 can realize a plug-in connection in an advantageous and reliable manner.

[0088] Optionally, as shown in Figures 3 to 5 Fig. 1, the mounting housing 12 can be substantially U-shaped. Additionally or alternatively, the mounting housing 12 can have an opening 125 through which the stator tooth 11 can be placed inside the mounting housing 12. For example, when assembling the stator tooth 11, the mounting housing 12 and the coil 13, the stator tooth 11 can be placed inside the mounting housing 12 through the opening 125 and then the coil 13 can be wound from the outside of the mounting housing 12.

[0089] Figure 4 An assembly of the stator tooth 11, the mounting shell 12 and the coil 13 is shown, wherein (a) is a perspective view of the assembly, (b) is a side view of the assembly, and (c) is a sectional view of the assembly taken along line A-A in (b). Figure 5 An individual mounting shell 12 is shown, wherein (a) is a front view of the mounting shell 12, (b) is a side view of the mounting shell 12, (c) is a sectional view of the mounting shell 12 taken along line B-B in (b), and (d) is a partial enlarged view of area C in (c).

[0090] As shown in Figs. 1 and 2, the mounting shell 12 has a plurality of openings 125 for receiving the stator teeth 11. The openings 125 are arranged in a circle around the center axis of the stator 1. Figure 4 And As shown in Figs. 1 and 2, the mounting shell 12 has a plurality of openings 125 for receiving the stator teeth 11. The openings 125 are arranged in a circle around the center axis of the stator 1. Figure 5 As shown in Figs. 1 and 2, the mounting shell 12 has a plurality of openings 125 for receiving the stator teeth 11. The openings 125 are arranged in a circle around the center axis of the stator 1.

[0091] Optionally, the stop 127 can be provided on the inner surfaces 126 of the mounting shell 12 opposite to each other, so that the stop 127 is invisible outside the mounting shell 12 or the assembly, and the winding of the coil 13 outside the mounting shell 12 is facilitated.

[0092] Additionally or alternatively, the stop 127 can be implemented as a hook adapted to be clamped to the end face of the stator tooth 11. That is, the end face of the stator tooth 11 adjacent to the inner end of the stator tooth 11, the two side faces between the inner end and the outer end away from the center axis of the stator 1 substantially fit with the inner surfaces of the mounting shell 12, and the end face of the outer end of the stator tooth 11 is in contact and abutment with the stop 127, so that the stator tooth 11 is fixed in the mounting shell 12 between the stop 127 and the portion of the mounting shell 12 opposite to the opening 125 in the radial direction Y of the stator 1.

[0093] Additionally or alternatively, the stop 127 can be integrally formed with the mounting shell 12, thereby facilitating the manufacture of the mounting shell 12.

[0094] Additionally or alternatively, the stop 127 can have a triangular cross section, and the hypotenuse of the triangular cross section is closer to the opening 125 than the base. That is, the stop 127 can guide the stator tooth 11 into the mounting shell 12 by the hypotenuse of the triangular cross section, and can reversely lock the stator tooth 11 by the base of the triangular cross section. The structure is simple and the connection is stable.

[0095] Additionally or alternatively, the stop 127 is spaced apart from the end of the mounting shell 12 (e.g. the first shell end 121 and the second shell end 122) defining the opening 125 in the radial direction Y of the stator 1, so that the coil 13 is spaced apart from the stator tooth 11 at the opening 125. In this way, it can be ensured that the mounting shell 12 can space apart the coil 13 and the stator tooth 11 from each other.

[0096] Embodiments of the present application also provide an external rotor motor comprising the stator 1 according to any of the embodiments of the present application. As shown in Figure 6 the external rotor motor 10 according to embodiments of the present application can comprise the stator 1 and a rotor 2. The rotor 2 can comprise a magnetically conductive structure 21 and permanent magnets 22 fixedly arranged on the magnetically conductive structure 21. For the sake of clarity, the magnetically conductive structure 21 and the permanent magnets 22 are shown separately in Figure 6 the external rotor motor 10 according to embodiments of the present application can comprise the stator 1 and a rotor 2. The rotor 2 can comprise a magnetically conductive structure 21 and permanent magnets 22 fixedly arranged on the magnetically conductive structure 21. For the sake of clarity, the magnetically conductive structure 21 and the permanent magnets 22 are shown separately in

[0097] As shown in Figure 6 the external rotor motor 10 according to embodiments of the present application can comprise the stator 1 and a rotor 2. The rotor 2 can comprise a magnetically conductive structure 21 and permanent magnets 22 fixedly arranged on the magnetically conductive structure 21. For the sake of clarity, the magnetically conductive structure 21 and the permanent magnets 22 are shown separately in

[0098] By some embodiments of the present application, two support plates can be utilized to fix the stator teeth and coils, and fix the coils between the support plates at both ends, thereby completing the assembly of the stator of the external rotor motor. The addition of the support plates can advantageously enhance the structural stability of the stator, ensure the accurate positioning of the stator teeth, and also achieve the effect of simplifying the structure. The stator teeth can be simply connected to the support plates at both sides by the mounting shell, and the stator teeth do not need to be directly connected to each other, nor do the stator teeth need to be directly connected to the support plates, thereby realizing a modular stator structure and a modular stator assembly method, simplifying the installation, and facilitating the replacement operation for a single stator tooth or a single assembly. In addition, the coils can be simply wound by the mounting shell, thereby providing support for the coils, and the coils can be wound individually for each stator tooth, so that the current parameters on each stator tooth can be flexibly adjusted, thereby enabling the motor to meet the fine application requirements. That is, according to some embodiments of the present application, the optimized axial flux structure of the external rotor motor, the modular assembly method, and the improved work efficiency can be achieved by the addition and structural design of the support plates and the mounting shell.

[0099] It should be understood that the expressions "first", "second", etc. are used herein only for descriptive purposes and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly indicating the number of technical features indicated. The features defined as "first", "second" can explicitly or implicitly indicate that they include at least one of the features. In addition, the term "directly connected" can mean connection without other components or structures.

[0100] It should also be understood that in the description of the specification, the description of the terms "one embodiment", "some embodiments" and "exemplary embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiments are included in at least one embodiment of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment.

[0101] Although specific implementations of the present application are described in detail herein, they are given by way of example only and are not intended to limit the scope of the present application. Various substitutions, alterations and modifications can be conceived without departing from the spirit and scope of the present application.

Claims

1. A stator for an external rotor motor, characterized in that, The stator (1) includes: A plurality of coils (13) spaced circumferentially along the stator (1) and magnetically conductive stator teeth (11) respectively mounted in each of the coils (13); and First support plate (14) and second support plate (15), The first support plate (14) and the second support plate (15) are arranged opposite each other on both sides of the stator tooth (11) along the axial direction (X) of the stator (1), and the coil (13) is fixed between the first support plate (14) and the second support plate (15).

2. The stator for an external rotor motor according to claim 1, characterized in that, A receiving part (143) is provided on the side of the first support plate (14) facing the second support plate (15), and the first support plate (14) and the second support plate (15) are fixedly connected to each other through the receiving part (143) by a connector (S); and / or The first support plate (14) and the second support plate (15) respectively have a plurality of radial portions (141, 151) extending in the radial direction (Y), and a hollow portion (142, 152) is formed between two adjacent radial portions (141, 151). The plurality of stator teeth (11) are at least partially exposed in the axial direction (X) through the corresponding hollow portion (142, 152).

3. The stator for an external rotor motor according to claim 1 or 2, characterized in that, The stator (1) further includes a plurality of mounting shells (12), each mounting shell (12) fixedly supports one stator tooth (11), and the coil (13) is wound on the outer peripheral surface of each mounting shell (12). The mounting shells (12) are respectively connected to the first support plate (14) and the second support plate (15).

4. The stator for an external rotor motor according to claim 3, characterized in that, The mounting housing (12) is configured to space the coil (13) from the stator teeth (11) and / or insulate them from each other; and / or The mounting housing (12) is formed of insulating plastic; and / or The coil (13) forms a plurality of turns arranged side by side along the axial direction (X) of the stator (1) on the outer peripheral surface of the mounting housing (12); and / or The mounting housing (12) has a first housing end (121) connected to the first support plate (14), a second housing end (122) connected to the second support plate (15), and an intermediate housing portion (123) located between the first housing end (121) and the second housing end (122), wherein the first housing end (121) and the second housing end (122) protrude from the intermediate housing portion (123) in the circumferential direction, and the coil (13) is wound around the entire intermediate housing portion (123).

5. The stator for an external rotor motor according to claim 4, characterized in that, The stator tooth (11) has a first tooth end (111), a second tooth end (112), and a middle tooth portion (113) located in the middle. The first tooth end (111) and the second tooth end (112) protrude to both sides of the middle tooth portion (113) along the circumferential direction of the stator (1). Wherein, the outer surface (114) of the intermediate tooth (113) and the inner surface (126) of the mounting shell (12) are in contact with each other; and / or The first tooth tip (111) and the second tooth tip (112) extend from the first shell end (121) and the second shell end (122) along the axial direction (X) of the stator (1), such that the mounting shell (12) secures the stator tooth (11) along the axial direction (X) through the first shell end (121) and the second shell end (122); and / or The first tooth tip (111) and the second tooth tip (112) extend along the axial direction (X) to be flush with or beyond the outer surfaces (144, 154) of the first support plate (14) and the second support plate (15).

6. The stator for an external rotor motor according to claim 4 or 5, characterized in that, The first shell end (121) and the second shell end (122) are respectively provided with connecting portions (124) suitable for insertion into the first support plate (14) and the second support plate (15). The connecting portion (124) is inserted into the cutout portions (142, 152) of the first support plate (14) and the second support plate (15), respectively, such that a single mounting shell (12) corresponds to a single cutout portion (142, 152) of the first support plate (14) and the second support plate (15); and / or The connecting portion (124) is implemented as a protruding rib protruding outward from the first shell end (121) or the second shell end (122) along the axial direction (X) of the stator (1); and / or The connecting portion (124) is implemented in a generally U-shaped structure; and / or Two adjacent connecting portions (124) from two adjacent mounting shells (12) respectively clamp the same radial portion (141, 151) of the first support plate (14) or the second support plate (15) in the middle.

7. The stator for an external rotor motor according to claim 3, characterized in that, The mounting housing (12) has an opening (125) through which the stator tooth (11) is placed within the mounting housing (12). The mounting housing (12) has a stop (127) in a region adjacent to the opening (125), the stop (127) being adapted to fix the stator tooth (11) within the mounting housing (12) along the radial direction (Y) of the stator (1).

8. The stator for an external rotor motor according to claim 7, characterized in that, The stop (127) is provided on the opposing inner surfaces (126) of the mounting housing (12); and / or The stop (127) is configured as a hook adapted to engage with the end face of the stator tooth (11); and / or The stop (127) is integrally formed with the mounting shell (12); and / or The stop (127) is spaced apart from the ends of the first shell end (121) and the second shell end (122) that define the opening (125) along the radial direction (Y) of the stator (1), such that the coil (13) is spaced apart from the stator teeth (11) at the opening (125); and / or The stop (127) has a triangular cross-section, and the hypotenuse of the triangle is closer to the opening (125) than the base.

9. An external rotor motor, characterized in that, The external rotor motor (10) includes: Stator (1) according to any one of claims 1-8; and Rotor (2).

10. The external rotor motor according to claim 9, characterized in that, The rotor (2) is rotatable relative to the stator (1) about the central axis of the stator (1), the central axis extending along the axial direction (X) of the stator (1), the rotor (2) having a permanent magnet (22), and a magnetic gap between the stator teeth (11) and the permanent magnet (22) along the axial direction (X); and / or The stator (1) is fixedly sleeved on the spindle (5), and the rotor (2) is rotatably sleeved on the spindle (5). The spindle (5) is arranged extending along the axial direction (X) of the stator (1); and / or The external rotor motor (10) includes two rotors (2) located on both sides of the stator (1).

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