Outer rotor brushless motor and hub motor wheel

Abstract

The utility model provides an outer rotor brushless motor and a hub motor wheel, and belongs to the technical field of motors, the outer rotor brushless motor comprises a shell, a motor shaft, a rotor, a stator and a position detection device, and the motor shaft is rotatably connected with the shell; the rotor is arranged in the shell and is in transmission connection with the shell, the stator is fixed on the motor shaft, an accommodating space is formed between the stator and the rotor, and the position detection device is arranged in the accommodating space. According to the outer rotor brushless motor provided by the invention, the accommodating space for placing the position detection device is formed between the stator and the rotor, so that the height of the motor along the axis of the motor shaft can be reduced, and the miniaturization design of the motor is facilitated.

Description

Technical Field

[0001] This application belongs to the field of motor technology, and in particular relates to an external rotor brushless motor and a hub motor wheel. Background Technology

[0002] The load configuration of hub brushless motors differs from that of traditional brushless motors. Hub brushless motors employ a wheel-side load, meaning the motor shaft is a stationary component, while the rotor externally carries the wheel-side load to perform work. In some existing hub brushless motors, the magnetic encoder significantly occupies the motor's axial space, hindering miniaturization. Utility Model Content

[0003] The purpose of this application is to provide an external rotor brushless motor and a hub motor wheel to solve the technical problem that the magnetic encoder in some existing hub brushless motors occupies a large amount of the motor's axial space, which is not conducive to the miniaturization of the motor.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] The first aspect of this application provides an external rotor brushless motor, comprising:

[0006] case;

[0007] The motor shaft is rotatably connected to the housing;

[0008] The rotor is housed within the housing and is connected to the housing in a driving manner;

[0009] The stator is fixed on the motor shaft, and there is a space between the stator and the rotor.

[0010] A position detection device is installed in the containment space.

[0011] In some implementations, the position detection device includes a first component connected to the rotor and a second component connected to the stator, wherein one of the first component and the second component is a magnetic element and the other is a magnetic sensor.

[0012] In some implementations, the rotor includes a rotor frame and several magnets. The motor shaft passes through the rotor frame and the two are rotatably connected. Several magnets are provided on the circumferential inner surface of the rotor frame. An accommodating space is formed between the rotor frame and the stator along the axial direction of the motor shaft.

[0013] In some implementations, the rotor frame includes a first frame section, a second frame section, and a third frame section. The first frame section is sleeved on the motor shaft and the two are rotatably connected. The second frame section connects the first frame section and the third frame section. The third frame section is annular and a magnet is provided on the inner surface of the third frame section. A position detection device is installed on the first frame section and / or the second frame section.

[0014] In some implementations, the first frame segment and the third frame segment are spaced apart along the radial direction of the motor shaft. The position detection device includes a first component, which is a magnetic component. The first component of the position detection device is sleeved on the first frame segment and is attached to or close to the second frame segment.

[0015] In some implementations, the second frame section includes an inner region and an outer region, which are arranged sequentially along the radial direction of the motor shaft and connected to each other. The inner region and the outer region are respectively connected to the first frame section and the third frame section. The inner region is closer to the stator than the outer region so that a step is formed between them. The inner region is directly opposite the first component of the position detection device.

[0016] In some implementations, the external rotor brushless motor includes a first gear section and a second gear section. The motor shaft passes through the first gear section and the first gear section is fixedly connected to the side of the inner region section opposite to the stator. The second gear section is an internal gear and is fixed on the inner side of the housing. The second gear section is drivingly connected to the first gear section.

[0017] In some implementations, the stator includes a stator frame and windings wound on the stator frame, the motor shaft passes through the stator frame and the two are fixedly connected, and a position detection device is installed in the area of ​​the stator frame facing the second frame section and / or the first frame section.

[0018] In some implementations, an annular clearance groove is provided on the side of the stator frame facing the second frame section, the position detection device includes a second component and the second component is a magnetic sensor, the annular clearance groove is connected to the inner side of the stator frame, and the second component of the position detection device is installed in the annular clearance groove.

[0019] A second aspect of this application provides a hub motor wheel, comprising a tire body, an external rotor brushless motor as provided in any of the above technical solutions, and a fixed ring assembled between the tire body and the external rotor brushless motor.

[0020] The beneficial effects of this application are as follows: The external rotor brushless motor provided in this application embodiment has a receiving space between the stator and the rotor, and the position detection device is disposed in the receiving space. That is to say, without changing the relative position of the stator and the rotor, that is, without changing the size of the space occupied by the stator and the rotor along the motor axis, the shape of the two can be changed to form a receiving space for placing the position detection device. Alternatively, the size of the space occupied by the stator and the rotor along the motor axis can be appropriately increased. However, it is best to design the increased space of the stator and the rotor to be smaller than the size of the axial space occupied by the magnetic encoder in the prior art. That is, in this application embodiment, by setting a receiving space between the stator and the rotor for placing the position detection device, it is possible to reduce the height of the motor along the motor axis, thereby facilitating the miniaturization design of the motor. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an external rotor brushless motor provided in an embodiment of this application;

[0023] Figure 2 This is another structural schematic diagram of the external rotor brushless motor provided in the embodiments of this application;

[0024] Figure 3 A top view schematic diagram of an external rotor brushless motor provided in an embodiment of this application;

[0025] Figure 4 for Figure 3 Schematic diagram of the sectional view along the central AA direction;

[0026] Figure 5 This is a schematic diagram of the rotor frame provided in an embodiment of this application;

[0027] Figure 6 A partial cross-sectional schematic diagram of the rotor, stator, and motor shaft provided in an embodiment of this application;

[0028] Figure 7 This is a schematic diagram of the stator structure provided in an embodiment of this application;

[0029] Figure 8 A top view schematic diagram of an external rotor brushless motor provided in an embodiment of this application;

[0030] Figure 9for Figure 8 Schematic diagram of the BB-direction section;

[0031] Figure 10 This is an exploded view of an external rotor brushless motor provided in an embodiment of this application.

[0032] The following are the labeling elements in the figure:

[0033] 10- External rotor brushless motor;

[0034] 100-Housing; 200-Motor shaft; 300-Rotor; 400-Stator; 500-Position detection device; 600-Bearing; 700-Oil seal; 800-Sealing ring; 900-Transmission structure; 101-Accommodation space;

[0035] 110 - First housing; 120 - Second housing;

[0036] 111 - Groove;

[0037] 310 - Rotor frame; 320 - Magnet;

[0038] 311 - First frame section; 312 - Second frame section; 313 - Third frame section; 314 - Extension section;

[0039] 3121 - Inner region; 3122 - Outer region; 3123 - Rotor frame opening;

[0040] 3131 - Mating plane;

[0041] 410 - Stator frame; 420 - Winding;

[0042] 411-Annular clearance groove; 412-Stator frame opening;

[0043] 510 - First component; 520 - Second component;

[0044] 910 - First gear section; 920 - Second gear section; 930 - Third gear section; 940 - Gear support;

[0045] 911 - Gear body; 912 - Gear end;

[0046] 931 - Third Gear Section 1; 932 - Third Gear Section 2; 933 - Third Gear Section 3;

[0047] 941 - Connecting shaft. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0049] In the description of this application, it should be understood that the terms "length", "width", "thickness", "top", "bottom", "inner", "outer", "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] To facilitate a clear description of the technical solutions of this application, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" do not necessarily imply that they are different.

[0051] In this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0053] It should be noted that, in this application, the words "in one embodiment," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in one embodiment," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "in one embodiment," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner.

[0054] Please see Figures 1-4 , Figure 1This is a schematic diagram of the structure of the external rotor brushless motor 10 provided in the embodiments of this application. Figure 2 This is another structural schematic diagram of the external rotor brushless motor 10 provided in the embodiments of this application. Figure 3 This is a top view of the external rotor brushless motor 10 provided in an embodiment of this application. Figure 4 for Figure 3 Schematic diagram of the sectional view along the AA direction.

[0055] This application provides an external rotor brushless motor 10, including a housing 100, a motor shaft 200, a rotor 300, and a stator 400.

[0056] Please see Figures 1-2 The diagram illustrates the housing 100 and motor shaft 200 of the external rotor brushless motor 10. One end of the motor shaft 200 is inserted into the housing 100, and the motor shaft 200 is rotatably connected to the housing 100. Please refer to [link to documentation]. Figure 4 The stator 400 and rotor 300 of the external rotor brushless motor 10 are housed in the housing 100. The stator 400 is fixedly connected to the motor shaft 200, and the rotor 300 is driven to the housing 100, for example, through the transmission structure 900. When the rotor 300 rotates, it can drive the housing 100 to rotate relative to the stator 400 and the motor shaft 200.

[0057] In one example, see Figure 1 and Figure 2 The housing 100 includes a first housing 110 and a second housing 120. The first housing 110 and the second housing 120 are arranged sequentially along the axial direction of the motor shaft 200. The first housing 110 and the second housing 120 are detachably connected and a sealing ring 800 is provided between them.

[0058] Please see Figure 4 The motor shaft 200 passes through the second housing 120, and a bearing 600 and an oil seal 700 are provided between the two. The bearing 600 between the motor shaft 200 and the second housing 120 enables rotational connection between the two. The oil seal 700 is in close contact with the motor shaft 200 to prevent the lubricating oil inside the motor from leaking into the external environment and to effectively prevent external contaminants such as dust, impurities and moisture from entering the motor, thereby improving the life of the motor.

[0059] In one example, see Figure 4 A groove 111 is formed on the first housing 110, and a bearing 600 is fixed in the groove 111. One end of the motor shaft 200 is inserted into the bearing 600 in the groove 111 so that the motor shaft 200 can rotate and be supported on the first housing 110.

[0060] Please see Figure 4The external rotor brushless motor 10 provided in this application embodiment also includes a position detection device 500, which detects the position of the rotor 300 so as to control the switching of the current direction of the stator 400 winding 420 and maintain the continuous rotation of the rotor 300.

[0061] In one example, the position detection device 500 is a magnetic encoder or a photoelectric encoder, etc.

[0062] Please see Figure 4 In this embodiment, a receiving space 101 is formed between the stator 400 and the rotor 300, and the position detection device 500 is disposed within the receiving space 101. For this embodiment, it can be understood that, without changing the relative positions of the stator 400 and the rotor 300, i.e., without changing the space occupied by the stator 400 and the rotor 300 along the axial direction of the motor shaft 200, the shape of the two components can be changed to form a receiving space 101 for placing the position detection device 500. Alternatively, the space occupied by the stator 400 and the rotor 300 along the axial direction of the motor shaft 200 can be appropriately increased. However, it is preferable to design the increased space of the stator 400 and the rotor 300 to be smaller than the size of the axial space occupied by the magnetic encoder inside the motor in the prior art.

[0063] In this embodiment of the application, by setting a receiving space 101 between the stator 400 and the rotor 300 for placing the position detection device 500, it is possible to reduce the height of the motor along the axial direction of the motor shaft 200, thereby facilitating the miniaturization design of the motor.

[0064] In one embodiment, the position detection device 500 includes a first component 510 connected to the rotor 300 and a second component 520 connected to the stator 400, wherein one of the first component 510 and the second component 520 is a magnetic element and the other is a magnetic sensor.

[0065] In this embodiment, the magnetic component can be disposed on the stator 400, and the magnetic sensor on the rotor 300; alternatively, the magnetic sensor can be disposed on the stator 400, and the magnetic component on the rotor 300. Please refer to [link to relevant documentation]. Figure 4 This illustrates that the magnetic sensor is mounted on the stator 400, and the magnetic component is mounted on the rotor 300. That is, the magnetic component can rotate with the rotor 300. When the magnetic component rotates with the rotor 300, the magnetic sensor can detect the change in the direction of the magnetic field, thereby obtaining information such as the position of the stator 400.

[0066] In some examples, the magnetic sensor includes a Hall sensor and a Hall plate. The Hall sensor is integrated into the Hall plate, which is fixed to the stator 400 or rotor 300. The Hall plate typically also includes other components such as signal processing circuitry for processing and converting the signal detected by the Hall sensor.

[0067] In one example, the Hall sensor is a linear Hall sensor, whose output voltage signal is linearly related to the detected magnetic field strength. In other examples, the Hall sensor is a switching Hall sensor, which outputs a fixed high or low level signal when the magnetic field strength reaches a set threshold (action point), and flips the output state when the magnetic field strength falls below another set threshold (release point). Because linear Hall sensors offer high control accuracy, it is preferable to configure the Hall sensor as a linear Hall sensor.

[0068] It is worth noting that the linear Hall sensor is too sensitive and usually cannot use the magnetic field of the motor rotor 300 itself for position sensing. Therefore, it is necessary to add a separate magnetic component to the motor to facilitate the Hall sensor to sense the position of the rotor 300.

[0069] In this embodiment, the position detection device 500 includes a magnetic component and a magnetic sensor, that is, the position detection device 500 is set as a magnetic encoder, which has the advantages of high detection accuracy and relatively low cost.

[0070] Please see Figures 5-7 , Figure 5 This is a schematic diagram of the rotor frame 310 provided in an embodiment of this application. Figure 6 This is a cross-sectional schematic diagram of the rotor 300, stator 400, and motor shaft 200 provided in an embodiment of this application. Figure 7 This is a schematic diagram of the structure of the stator 400 provided in an embodiment of this application.

[0071] In one embodiment, please refer to Figure 6 The rotor 300 includes a rotor frame 310 and a plurality of magnets 320. The motor shaft 200 passes through the rotor frame 310 and the two are rotatably connected. A plurality of magnets 320 are provided on the inner circumferential side of the rotor frame 310. A receiving space 101 is formed between the rotor frame 310 and the stator 400 along the axial direction of the motor shaft 200.

[0072] A plurality of magnets 320 are provided on the circumferential inner surface of the rotor frame 310. See one example. Figure 6 Magnet 320 is directly opposite the circumferential outer surface of stator 400 along the radial direction of motor shaft 200.

[0073] Please see Figure 6The stator 400 includes a stator frame 410 and a winding 420 wound on the stator frame 410. The motor shaft 200 passes through the stator frame 410 and the two are fixedly connected. The magnet 320 faces the winding 420 on the stator frame 410 along the radial direction of the motor shaft 200. After current passes through the winding 420 of the stator 400, a magnetic field is generated that interacts with the magnet 320 on the rotor frame 310.

[0074] In one example, the stator housing 410 is interference-fitted onto the motor shaft 200 to reduce the number of parts.

[0075] In one example, the magnet 320 on the rotor frame 310 is a rectangular plate. See also Figure 5 The inner circumferential side of the rotor frame 310 forms several mating planes 3131. There are multiple mating planes 3131, and the multiple mating planes 3131 are arranged sequentially along the circumferential direction of the rotor frame 310. The magnets 320 are respectively arranged on the corresponding mating planes 3131.

[0076] In one example, the rotor frame 310 is connected to the magnet 320 by riveting or gluing.

[0077] In one example, the motor shaft 200 is rotatably connected to the rotor frame 310 via a bearing 600.

[0078] In this embodiment, the magnet 320 is positioned radially opposite the outer circumferential surface of the stator 400 along the motor shaft 200, so that the magnet 320 on the rotor frame 310 interacts with the winding 420 on the stator 400. By setting the motor shaft 200 to pass through the rotor frame 310 and the two to be rotatably connected, the rotor 300 is supported on the motor shaft 200, while the rotor frame 310 and the stator 400 are connected to form a space 101 for accommodating the placement position detection device 500.

[0079] In one embodiment, please refer to Figure 5 The rotor frame 310 includes a first frame section 311, a second frame section 312, and a third frame section 313. The first frame section 311 is sleeved on the motor shaft 200 and the two are rotatably connected. The second frame section 312 connects the first frame section 311 and the third frame section 313. The third frame section 313 is annular and a magnet 320 is provided on the inner side of the third frame section 313. The first frame section 311 and / or the second frame section 312 are equipped with a position detection device 500.

[0080] Please see Figure 6 The second frame section 312 is directly opposite the stator 400 along the axial direction of the motor shaft 200, and there is a gap between the second frame section 312 and the stator 400 to facilitate the formation of a space 101 for accommodating the placement of the position detection device 500.

[0081] In this embodiment of the application, the first component 510 or the second component 520 of the position detection device 500 may be connected to the first frame section 311, or the first component 510 or the second component 520 of the position detection device 500 may be connected to the second frame section 312, or both the first component 510 or the second component 520 of the position detection device 500 may be connected to the first frame section 311 and the second frame section 312.

[0082] In one example, the first frame segment 311 is rotatably connected to the motor shaft 200 via one or more bearings 600. See also Figure 6 , Figure 6 The diagram shows two bearings 600 installed between the first frame section 311 and the motor shaft 200.

[0083] In one example, the first frame section 311, the second frame section 312, and the third frame section 313 are integrally formed to reduce the number of parts.

[0084] In this embodiment, the rotor frame 310 is configured to include a first frame section 311, a second frame section 312, and a third frame section 313. This allows the rotor frame 310 to support the magnet 320 that cooperates with the stator winding 420, while also facilitating the formation of a space 101 for accommodating the placement position detection device 500 between the second frame section 312 and the stator 400 along the axial direction of the motor shaft 200.

[0085] In one embodiment, please refer to Figure 5 and Figure 6 The first frame section 311 and the third frame section 313 are arranged at intervals along the radial direction of the motor shaft 200. The first component 510 of the position detection device 500 is sleeved on the first frame section 311 and is attached to or close to the second frame section 312.

[0086] The first frame section 311 and the third frame section 313 are spaced apart along the radial direction of the motor shaft 200, i.e., see [reference needed]. Figure 6 The first frame section 311 and the third frame section 313 are located on the same side of the second frame section 312 along the axis of the motor shaft 200, so as to reduce the space occupied by the rotor frame 310 along the axis of the motor shaft 200.

[0087] Please see Figure 5 The first frame segment 311 is circular in shape; please refer to [link / reference]. Figure 6 The first frame section 311 is mounted on the motor shaft 200, and the first component 510 of the position detection device 500 is mounted on the first frame section 311.

[0088] In one example, the first component 510 of the position detection device 500 is tightly fitted onto the first frame section 311, and the first component 510 is attached to or close to the second frame section 312; or, in other examples, the diameter of the first component 510 is larger than the diameter of the first frame section 311, and the first component 510 is attached to and connected to the second frame section 312.

[0089] In one example, the first component 510 of the position detection device 500 is a magnetic component.

[0090] In one example, the end of the first frame section 311 that is away from the second frame section 312 is close to the stator 400. For example, the distance between the end of the first frame section 311 that is away from the second frame section 312 and the stator 400 is in the range of 1 to 20 mm, so as to facilitate the compact structure inside the motor and reduce the height of the motor.

[0091] In one example, the distance between the end of the first frame section 311 away from the second frame section 312 and the stator 400 is in the range of 1-5mm, 5-10mm, 10-15mm, or 15-20mm, etc.

[0092] In one example, see Figure 6 An extension section 314 is provided at the end of the first frame section 311 away from the second frame section 312. The bearing 600 located between the first frame section 311 and the electronic shaft contacts the extension section 314, that is, the extension section 314 is used to position the bearing 600 and the first frame section 311.

[0093] In one example, see Figure 5 and Figure 6 The second frame section 312 includes an inner region 3121 and an outer region 3122. The inner region 3121 and the outer region 3122 are arranged sequentially along the radial direction of the motor shaft 200 and are connected to each other. The inner region 3121 and the outer region 3122 are respectively connected to the first frame section 311 and the third frame section 313. The inner region 3121 is closer to the stator 400 than the outer region 3122 so that a step is formed between the two. The inner region 3121 is directly opposite the first component 510 of the position detection device 500.

[0094] In one example, a rotor frame opening 3123 is provided on the outer region 3122 to reduce the weight of the rotor frame 310.

[0095] In this embodiment, by setting the first frame segment 311 and the third frame segment 313 to be spaced apart along the radial direction of the motor shaft 200, the internal structure of the motor is made more compact and the height of the motor is reduced.

[0096] In one embodiment, please refer to Figure 6 and Figure 7 The stator 400 includes a stator frame 410 and a winding 420 wound on the stator frame 410. The motor shaft 200 passes through the stator frame 410 and the two are fixedly connected. A position detection device 500 is installed in the area of ​​the stator frame 410 facing the second frame section 312 and / or the first frame section 311.

[0097] In one example, the position detection device 500 is installed only on the area of ​​the stator frame 410 facing the second frame section 312; or, in another example, the position detection device 500 is installed only on the area of ​​the stator frame 410 facing the first frame section 311; or, in yet another example, the position detection device 500 is installed on both the area of ​​the stator frame 410 facing the second frame section 312 and the area of ​​the stator frame 410 facing the first frame section 311.

[0098] In one example, the second component 520 of the position detection device 500 is mounted on the stator frame 410, and the second component 520 is a magnetic sensor.

[0099] In one example, see Figure 6 The second component 520 is disposed on the area of ​​the stator frame 410 facing the second frame section 312.

[0100] In one example, the magnetic sensor is integrated on a Hall plate, which is detachably connected to the stator frame 410 via a connector, or the Hall plate is glued to the stator frame 410.

[0101] In one example, see Figure 6 The stator frame 410 is provided with a stator frame opening 412 to reduce the weight of the stator frame 410.

[0102] In one embodiment, please refer to Figure 5 and Figure 6 An annular clearance groove 411 is provided on the side of the stator frame 410 facing the second frame section 312, and the second component 520 of the position detection device 500 is installed in the annular clearance groove 411.

[0103] In one example, the annular clearance groove 411 connects to the inner side of the stator frame 410 so that the stator frame 410 can avoid the first frame section 311 of the rotor frame 310.

[0104] In this application example, by providing an annular clearance groove 411 in the stator frame 410, a space 101 for placing the position detection device 500 is formed between the stator frame 410 and the rotor frame 310, while reducing the space occupied by the stator frame 410 and the rotor frame 310 along the axis of the motor shaft 200.

[0105] Please see Figures 8-10 , Figure 8 This is a top view of the external rotor brushless motor 10 provided in an embodiment of this application. Figure 9 for Figure 8 Schematic diagram of the BB-direction section. Figure 10 This is an exploded view of the external rotor brushless motor 10 provided in the embodiments of this application.

[0106] In one embodiment, please refer to Figure 9 and Figure 10 The external rotor brushless motor 10 (i.e., the transmission structure 900) includes a first gear section 910 and a second gear section 920. The motor shaft 200 passes through the first gear section 910 and the first gear section 910 is fixedly connected to the side of the rotor 300 away from the stator 400. The second gear section 920 is an internal gear and is fixed on the inner side of the housing 100. The second gear section 920 is connected to the first gear section 910 in a transmission connection.

[0107] In one example, the first gear part 910 and the stator frame 410 of the stator 400 are detachably connected by a connector to facilitate the separate machining of the two components, the first gear part 910 and the stator frame 410.

[0108] In one example, the second gear portion 920 is detachably connected to the housing 100; or, in other examples, the second gear portion 920 is not detachably connected to the housing 100, such as by welding.

[0109] In one example, the transmission structure 900 further includes one or more third gear sections 930, each of which meshes with the first gear section 910 and the second gear section 920.

[0110] In one example, see Figure 10 There are three third gear sections 930, namely third gear section one 931, third gear section two 932, and third gear section three 933, which are distributed circumferentially around the first gear section 910. When the rotor 300 rotates, it drives the first gear section 910 to rotate. The rotation of the first gear section 910 drives the third gear sections one 931, third gear section two 932, and third gear section three 933 to rotate. The rotation of the third gear sections one 931, third gear section two 932, and third gear section three 933 drives the second gear section 920 to rotate.

[0111] In one example, see Figure 9 and Figure 10The transmission structure 900 also includes a gear bracket 940, through which the motor shaft 200 passes and is fixedly connected. A connecting shaft 941 is formed on the gear bracket 940. The number of connecting shafts 941 is the same as the number of third gear parts 930. The connecting shafts 941 are respectively inserted into the corresponding third gear parts 930. The third gear parts 930 and the connecting shafts 941 are connected by bearings 600. The third gear parts 930 can rotate relative to the connecting shafts 941.

[0112] In this embodiment, the rotor 300 and the housing 100 are connected by a gear transmission mechanism, which makes the transmission stable and accurate.

[0113] As described above, in one example, the second frame section 312 includes an inner region 3121 and an outer region 3122, which are sequentially arranged and connected along the radial direction of the motor shaft 200. The inner region 3121 is closer to the stator 400 than the outer region 3122 to form a step between them. The inner region 3121 faces the first component 510 of the position detection device 500. In one embodiment, please refer to... Figure 9 The first gear section 910 can be connected to the inner region section 3121.

[0114] In one example, the first gear portion 910 includes a gear body 911 and a gear end portion 912. The gear end portion 912 is disposed at one end of the gear body 911 and the two are connected. The gear end portion 912 is connected to the second gear portion 920 in a transmission manner. The gear end portion 912 is fixed on the inner region portion 3121.

[0115] In one example, the gear end 912 is fitted with the inner region 3121 and the gear end 912 is detachably connected to the inner region 3121 by a connector.

[0116] In this embodiment, by setting the inner region 3121 closer to the stator 400 relative to the outer region 3122 so that a step is formed between the two, and by connecting the first gear 910 to the inner region 3121, the internal structure of the motor can be made more compact, and the size of the motor along the direction of the motor shaft 200 can be reduced.

[0117] A hub motor wheel includes a tire body, an external rotor brushless motor 10 as provided in any of the above embodiments, and a fixing ring assembled between the tire body and the external rotor brushless motor 10.

[0118] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An external rotor brushless motor, characterized in that, include: Casing (100); The motor shaft (200) is rotatably connected to the housing (100); A rotor (300) is disposed inside the housing (100) and is connected to the housing (100) in a driving manner; A stator (400) is fixed on the motor shaft (200), and a receiving space (101) is formed between the stator (400) and the rotor (300); A position detection device (500) is disposed in the accommodating space (101).

2. The external rotor brushless motor as described in claim 1, characterized in that, The position detection device (500) includes a first component (510) connected to the rotor (300) and a second component (520) connected to the stator (400), wherein one of the first component (510) and the second component (520) is a magnetic component and the other is a magnetic sensor.

3. The external rotor brushless motor as described in claim 1, characterized in that, The rotor (300) includes a rotor frame (310) and a plurality of magnets (320). The motor shaft (200) passes through the rotor frame (310) and the two are rotatably connected. A plurality of the magnets (320) are provided on the inner circumferential side of the rotor frame (310). The receiving space (101) is formed between the rotor frame (310) and the stator (400) along the axial direction of the motor shaft (200).

4. The external rotor brushless motor as described in claim 3, characterized in that, The rotor frame (310) includes a first frame section (311), a second frame section (312), and a third frame section (313). The first frame section (311) is sleeved on the motor shaft (200) and the two are rotatably connected. The second frame section (312) connects the first frame section (311) and the third frame section (313). The third frame section (313) is annular and the magnet (320) is provided on the inner side of the third frame section (313). The position detection device (500) is installed on the first frame section (311) and / or the second frame section (312).

5. The external rotor brushless motor as described in claim 4, characterized in that, The first frame segment (311) and the third frame segment (313) are spaced apart along the radial direction of the motor shaft (200). The position detection device (500) includes a first component (510) and the first component (510) is a magnetic component. The first component (510) is sleeved on the first frame segment (311) and is attached to or close to the second frame segment (312).

6. The external rotor brushless motor as described in claim 5, characterized in that, The second frame section (312) includes an inner region (3121) and an outer region (3122). The inner region (3121) and the outer region (3122) are arranged sequentially along the radial direction of the motor shaft (200) and connected to each other. The inner region (3121) and the outer region (3122) are respectively connected to the first frame section (311) and the third frame section (313). The inner region (3121) is closer to the stator (400) than the outer region (3122) so that a step is formed between them. The inner region (3121) is directly opposite the first component (510).

7. The external rotor brushless motor as described in claim 6, characterized in that, The external rotor brushless motor (10) includes a first gear section (910) and a second gear section (920). The motor shaft (200) passes through the first gear section (910), and the first gear section (910) is fixedly connected to the inner side region (3121) on the side opposite to the stator (400). The second gear section (920) is an internal gear and is fixed to the inner side of the housing (100). The second gear section (920) is drive-connected to the first gear section (910).

8. The external rotor brushless motor as described in claim 4, characterized in that, The stator (400) includes a stator frame (410) and a winding (420) wound on the stator frame (410). The motor shaft (200) passes through the stator frame (410) and the two are fixedly connected. The position detection device (500) is installed in the area of ​​the stator frame (410) facing the second frame section (312) and / or facing the first frame section (311).

9. The external rotor brushless motor as described in claim 8, characterized in that, The stator frame (410) is provided with an annular clearance groove (411) on the side facing the second frame section (312). The position detection device (500) includes a second component (520) and the second component (520) is a magnetic sensor. The second component (520) is installed in the annular clearance groove (411).

10. A hub motor wheel, characterized in that, Includes a tire body, an external rotor brushless motor (10) as described in any one of claims 1-9, and a retaining ring assembled between the tire body and the external rotor brushless motor (10).

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