External rotor motor

Abstract

An external rotor motor comprises a rotor body, the rotor body comprises a rotor shell, a rotor base, a magnetic structure, a first cylindrical protection structure and a rotating shaft, one end of the rotor shell is arranged on the rotor base and matched with the rotor base to form a first cavity, the rotating shaft is arranged in the first cavity, and one end of the rotating shaft is connected with the rotor base. The first cylindrical protection structure is arranged in the first cavity, a second cavity is formed between the outer wall of the first cylindrical protection structure and the inner wall of the rotor shell, and the magnetic structure is arranged in the second cavity. And the outer surface of the stator main body is sleeved with a second cylindrical protection structure, the stator main body is arranged in the first cavity, and the inner wall of the first cylindrical protection structure and the outer wall of the second cylindrical protection structure are oppositely arranged and spaced by a preset distance. The first cylindrical protection structure and the second cylindrical protection structure can avoid abrasion caused by scraping of the rotor and the stator by pollutants such as gravel, so that parts, used for generating an electromagnetic effect, in the outer rotor motor are protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to a kind of outer rotor motor. BACKGROUND

[0002] The outer rotor motor is a kind of motor, and the rotor is located outside the stator, and the rotor rotates around the stator. This structure makes the outer rotor motor can play unique advantages in many application scenarios, such as in the device with high space utilization requirements, the need for large torque output or good heat dissipation requirements is more widely used.

[0003] The patent document with authorized announcement number CN219513862U discloses an outer rotor motor, which specifically discloses that the outer rotor motor includes a stator, a rotor, a stator main body, a rotor support, and a support end face. The rotor support is fixedly arranged on one side of the support end face and includes a support column assembly extending from the support end face. The support column assembly includes support columns arranged at intervals in the circumferential direction. An inner ring sleeve is tightly fitted on the inner wall of the rotor support, and an outer ring sleeve is tightly fitted on the outer wall of the rotor support. A plurality of magnetic elements are installed in the accommodation space formed by the inner ring sleeve, the outer ring sleeve, and the support column assembly.

[0004] The outer rotor in the above patent document can solve the problem that dust is easily accumulated in the gap and surface between the magnetic elements, affecting the magnetism of the magnetic elements. However, it cannot solve the problem of wear and corrosion caused by the scratching of particulate matter on the rotor and stator during the operation of the outer rotor motor, which damages the important components inside the outer rotor motor for generating electromagnetic effect. Utility model content

[0005] To solve the problems existing in the prior art, the utility model aims to provide an outer rotor motor that can prevent the wear and corrosion caused by the scratching of particulate matter on the rotor and stator, thereby effectively protecting the important components inside the outer rotor motor for generating electromagnetic effect.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] An outer rotor motor comprises a rotor body, the rotor body comprising a rotor shell, a rotor base, a magnetic structure, a first cylindrical protective structure and a rotating shaft, one end of the rotor shell is arranged on the rotor base, and the rotor shell and the rotor base cooperate to form a first cavity, the rotating shaft is arranged in the first cavity and one end of the rotating shaft is connected with the rotor base; the first cylindrical protective structure is arranged in the first cavity, and a second cavity is formed between the outer wall of the first cylindrical protective structure and the inner wall of the rotor shell, and the magnetic structure is arranged in the second cavity; a stator body, a second cylindrical protective structure is sleeved on the outer surface of the stator body, the stator body is arranged in the first cavity, and the inner wall of the first cylindrical protective structure and the outer wall of the second cylindrical protective structure are oppositely arranged and spaced apart by a predetermined distance.

[0008] Further, the first cylindrical protective structure is integrally formed.

[0009] Further, the first cylindrical protective structure comprises a first sheet material, the first sheet material comprises a first side edge, a second side edge, a third side edge and a fourth side edge, the first sheet material is bent into a cylindrical shape, the third side edge and the fourth side edge are oppositely spaced apart by a predetermined distance, and the first side edge and the second side edge are connected with each other.

[0010] Further, the first side edge and the second side edge are respectively in a straight line shape.

[0011] Further, a connecting line formed at the connection of the first side edge and the second side edge is parallel to the central axis of the first cylindrical protective structure.

[0012] Further, in a vertical projection plane, the projection of the connecting line formed at the connection of the first side edge and the second side edge and the projection of the central axis of the first cylindrical protective structure form an included angle.

[0013] Further, the first side edge and the second side edge are respectively in a non-straight line shape, and when the first side edge and the second side edge are connected together, the first side edge and the second side edge are in a clamping shape.

[0014] Further, at least one first protruding structure is arranged on the first side edge, and at least one first recess structure is arranged at a corresponding position of the second side edge; when the first side edge and the second side edge are connected together, the first protruding structure and the first recess structure are in a clamping shape.

[0015] Further, at least one second concave structure is arranged on the first side edge, and at least one second convex structure is arranged at a corresponding position of the second side edge; when the first side edge and the second side edge are connected together, the second convex structure is in engagement with the second concave structure.

[0016] Further, one end of the first cylindrical protection structure is provided with a bending part, an edge of the bending part is connected with the inner wall of the rotor shell, and the inner wall of the rotor shell, the outer wall of the bending part and the outer wall of the first cylindrical protection structure cooperatively form the second cavity.

[0017] Further, the magnetic structure comprises a plurality of magnets, and the plurality of magnets are arranged in the second cavity.

[0018] Further, a plurality of grooves are arranged along the circumferential direction of the inner wall of the rotor shell, and the magnets are arranged in the grooves.

[0019] Further, a plurality of protrusions are arranged along the circumferential direction of the inner wall of the rotor shell, and the magnets are arranged between two adjacent protrusions.

[0020] Further, the magnetic structure further comprises a positioning plastic part, the positioning plastic part is in the form of a ring, and a plurality of positioning grooves are arranged along the circumferential direction of one end of the positioning plastic part, and the magnets are arranged in the positioning grooves.

[0021] Further, the second cylindrical protection structure is integrally formed.

[0022] Further, the second cylindrical protection structure comprises a second sheet material, the second sheet material comprises a fifth side edge, a sixth side edge, a seventh side edge and an eighth side edge, the second sheet material is bent into a cylindrical shape, the seventh side edge and the eighth side edge are oppositely spaced apart by a predetermined distance, and the fifth side edge and the sixth side edge are connected with each other.

[0023] Further, the fifth side edge and the sixth side edge are respectively in the form of a straight line.

[0024] Further, a connecting line formed at the connection of the fifth side edge and the sixth side edge is parallel to the central axis of the second cylindrical protection structure.

[0025] Further, in a vertical projection plane, a projection of the connecting line formed at the connection of the fifth side edge and the sixth side edge forms an angle with a projection of the central axis of the second cylindrical protection structure.

[0026] Further, the fifth side and the sixth side are respectively in a non-linear shape, and when the fifth side and the sixth side are connected together, the fifth side and the sixth side are in a meshing shape.

[0027] Further, at least one third protruding structure is arranged on the fifth side, and at least one third recessed structure is arranged at a corresponding position of the sixth side; when the fifth side and the sixth side are connected together, the third protruding structure and the third recessed structure are in a meshing shape.

[0028] Further, at least one fourth recessed structure is arranged on the fifth side, and at least one fourth protruding structure is arranged at a corresponding position of the sixth side; when the fifth side and the sixth side are connected together, the fourth protruding structure and the fourth recessed structure are in a meshing shape.

[0029] Further, the stator body comprises a stator core, a stator winding and a stator potting structure, the stator core is arranged on the stator winding, and the stator winding is arranged on the stator potting structure.

[0030] Further, an avoiding channel penetrates through upper and lower ends of the stator body, and the rotating shaft is rotatably arranged in the avoiding channel.

[0031] Further, a first bearing and a second bearing are arranged at two ends of the avoiding channel respectively, and the first bearing and the second bearing are connected with the rotating shaft respectively.

[0032] Further, a quick disassembly structure is detachably arranged on an end face of an upper end of the stator body and located in an opening of an upper end of the avoiding channel.

[0033] Further, the first cylindrical protective structure and / or the second cylindrical protective structure are made of metal or non-metal materials.

[0034] Further, a protective structure is arranged on a surface of the rotating shaft.

[0035] The utility model discloses the beneficial effect is:

[0036] The utility model discloses a first cylindrical protective structure is arranged in the first cavity of the rotor body, and a second cylindrical protective structure is arranged on the outer surface of the stator body, and the first cylindrical protective structure and the second cylindrical protective structure are oppositely arranged and are spaced apart by a predetermined distance, so that the particulate matter can effectively protect the important components for generating electromagnetic effect in the outer rotor motor under the action of the first cylindrical protective structure and the second cylindrical protective structure even if entering the inside of the outer rotor motor. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a three-dimensional structure schematic view of an embodiment of the utility model;

[0038] Figure 2 is Figure 1 a three-dimensional structure schematic view of the rotor body in the utility model;

[0039] Figure 3 is Figure 2 a three-dimensional structure schematic view of the rotor body in the utility model;

[0040] Figure 4 is Figure 3 a sectional view schematic view of the utility model;

[0041] Figure 5 is Figure 4 a structure enlarged schematic view at A of the utility model;

[0042] Figure 6 is Figure 3 a three-dimensional structure schematic view of the rotor body in the utility model;

[0043] Figure 7 is Figure 6 a plane structure schematic view of the first sheet material before bending in the utility model;

[0044] Figure 8 is Figure 7 a plane structure schematic view after bending in the utility model;

[0045] Figure 9 is Figure 6 a three-dimensional structure schematic view of the first cylindrical protective structure in the utility model;

[0046] Figure 10 is Figure 2 a three-dimensional structure schematic view of the stator body in the utility model;

[0047] Figure 11 is Figure 10 a sectional view schematic view at A-A' of the utility model;

[0048] Figure 12 is Figure 10 a sectional view schematic view at B-B' of the utility model;

[0049] Figure 13 is Figure 10 a three-dimensional structure schematic view of the stator body in the utility model;

[0050] Figure 14 is Figure 13 a plane structure schematic view of the second sheet material before bending in the utility model;

[0051] Figure 15 is Figure 14 a plane structure schematic view after bending in the utility model;

[0052] Figure 16 isFigure 13 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0053] Figure 17 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0054] Figure 18 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model; Figure 17 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0055] Figure 19 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0056] Figure 20 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0057] Figure 21 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model; Figure 20 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0058] Figure 22 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0059] Figure 23 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model; Figure 22 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0060] Figure 24 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0061] Figure 25 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0062] Figure 26 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model; Figure 25 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0063] Figure 27 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0064] Figure 28 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0065] Figure 29 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0066] Figure 30 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model; Figure 29 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model;

[0067] Figure 31 The third embodiment of the utility model is a schematic diagram of the perspective structure of the first cylindrical protective structure in the second embodiment of the utility model; Figure 30a stereogram of the first tubular protective structure before being bent;

[0068] Figure 32 is a plane structure schematic diagram of the second sheet material before being bent in the twelfth embodiment of the utility model;

[0069] Figure 33 is Figure 32 a plane structure schematic diagram after being bent;

[0070] Figure 34 is a plane structure schematic diagram of the second sheet material before being bent in the eleventh embodiment of the utility model;

[0071] Figure 35 is Figure 34 a plane structure schematic diagram after being bent;

[0072] Figure 36 is a stereogram of the second tubular protective structure in the twelfth embodiment of the utility model.

[0073] Reference signs

[0074] 100, outer rotor motor;

[0075] 1, rotor main body; 11, rotor shell; 111, groove; 112, protruding block; 12, rotor base; 13, magnetic structure; 131, positioning plastic part; 1311, positioning groove; 132, magnet; 14, first tubular protective structure; 141, first sheet material; 1411, first side edge; 14111, first protruding structure; 14112, second recessed structure; 1412, second side edge; 14121, first recessed structure; 14122, second protruding structure; 1413, third side edge; 1414, fourth side edge; 142, bending part; 15, rotating shaft; 16, first cavity; 17, second cavity; 18, mounting part; 19, protective structure;

[0076] 2, stator main body; 21, second tubular protective structure; 211, second sheet material; 2111, fifth side edge; 21111, third protruding structure; 21112, fourth recessed structure; 2112, sixth side edge; 21121, third recessed structure; 21122, fourth protruding structure; 2113, seventh side edge; 2114, eighth side edge; 22, avoiding passage; 23, stator core; 231, main body part; 232, stator tooth; 24, stator winding; 25, stator potting structure; 251, first mounting passage; 26, stator cover; 261, mounting shaft; 262, second mounting passage; 263, protruding part; 2631, electric connection passage; 27, quick release structure;

[0077] 3, first bearing; 4, second bearing; 5, first waterproof sealing structure; 6, circuit board; 7, contact pin; 8, second waterproof sealing structure. DETAILED DESCRIPTION

[0078] In the description of the utility model, it needs to explain, the orientation or position relation that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top surface", "bottom surface" indicate is based on the orientation or position relation shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated position or element must have a specific orientation, a specific orientation is constructed and operated, therefore it cannot be understood as the limitation of the utility model.

[0079] In addition, if the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first" and "second" features defined can explicitly or implicitly include one or more features, and in the description of the utility model, the meaning of "several" is two or more than two, unless otherwise explicitly specified and limited.

[0080] In the utility model, except for another explicit provision and limitation, if the terms "assembly", "connection", "connection" are understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected, it can be directly connected, or it can be connected through an intermediate medium, and it can be connected between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0081] The utility model will be further described below in combination with the drawings and specific examples, and the following description is only exemplary and does not limit the protection scope of the utility model.

[0082] Please refer to Figures 1-16 An outer rotor motor 100, comprising a rotor body 1, the rotor body 1 includes rotor shell 11, rotor base 12, magnetic structure 13, first cylindrical protective structure 14 and rotating shaft 15, one end of rotor shell 11 is arranged on rotor base 12, and first cavity 16 is formed by cooperation with rotor base 12, rotating shaft 15 is arranged in first cavity 16 and one end thereof is connected with rotor base 12. The first cylindrical protective structure 14 is arranged in the first cavity 16, and the second cavity 17 is formed between the outer wall of the first cylindrical protective structure 14 and the inner wall of the rotor shell 11, and the magnetic structure 13 is arranged in the second cavity 17.

[0083] The stator body 2 is sleeved with a second cylindrical protective structure 21 on the outer surface of the stator body 2, and the stator body 2 is arranged in the first cavity 16. The inner wall of the first cylindrical protective structure 14 is arranged opposite to the outer wall of the second cylindrical protective structure 21 and is spaced apart by a predetermined distance.

[0084] Therefore, when the rotor body 1 rotates relative to the stator body 2, even if particles such as sand enter the first cavity 16, the particles will only scratch the first cylindrical protective structure 14 and the second cylindrical protective structure 21, without damaging the structure inside the rotor body 1 or damaging the structure inside the stator body 2, thereby protecting the internal structure of the outer rotor motor 100.

[0085] Please refer to Figures 7-9 In the embodiment, the first cylindrical protective structure 14 includes a first sheet material 141, and the first sheet material 141 includes a first side edge 1411, a second side edge 1412, a third side edge 1413, and a fourth side edge 1414. The first side edge 1411 and the second side edge 1412 are spaced apart by a predetermined distance, and the third side edge 1413 and the fourth side edge 1414 are spaced apart by a predetermined distance.

[0086] Specifically, the first side edge 1411 and the second side edge 1412 of the first sheet material 141 are linear, and the first side edge 1411 is perpendicular to the third side edge 1413 and the fourth side edge 1414, and the second side edge 1412 is perpendicular to the third side edge 1413 and the fourth side edge 1414. In terms of visual effect, the first sheet material 141 is a whole rectangle, which can also be a square, which is not limited here. The first sheet material 141 is curved into a cylindrical shape along the third side edge 1413 and the fourth side edge 1414, and the first side edge 1411 and the second side edge 1412 are connected to each other, and finally the first cylindrical protective structure 14 is formed. The connection mode of the first side edge 1411 and the second side edge 1412 can be welding, adhesive bonding or other modes, which are not limited here. This structure can adapt the first sheet material 141 to the cylindrical shape of the first cavity 16, and set the first sheet material 141 in the first cavity 16.

[0087] More specifically, when the first side edge 1411 and the second side edge 1412 are connected to each other, a connection line L1 is formed at the connection of the first side edge 1411 and the second side edge 1412, and a central axis L2 passes through the center point of the first cylindrical protective structure 14, and the connection line L1 and the central axis L2 are parallel to each other.

[0088] Please refer to Figures 4-9In the embodiment, one end (specifically, the third side edge 1413) of the first cylindrical protection structure 14 is provided with a bent portion 142, which is bent at an angle with respect to the side edge (specifically, the first side edge 1411 or the second side edge 1412) of the first cylindrical protection structure 14. As a preferred embodiment, the bent portion 142 is bent at an angle of 90°, but can also be bent at other angles, which are not limited herein. The edge of the bent portion 142 is connected to the inner wall of the rotor shell 11, and the outer wall of the bent portion 142 and the outer wall of the first cylindrical protection structure 14 cooperatively form the second cavity 17.

[0089] Of course, the bent portion 142 can be welded to one end of the first cylindrical protection structure 14, or can be formed by first bending the third side edge 1413 of the first sheet material 141 along the length direction of the first side edge 1411 (or the second side edge 1412) to form the bent portion 142 before connecting the first side edge 1411 and the second side edge 1412 of the first sheet material 141 to each other. The bent portion 142 can also be formed in other ways, which are not limited herein.

[0090] Specifically, the first cylindrical protection structure 14 and the bent portion 142 are made of metal or non-metal materials, and as a preferred embodiment, the first cylindrical protection structure 14 and the bent portion 142 are made of stainless steel.

[0091] In the embodiment, the magnetic structure 13 includes a positioning plastic part 131 and a plurality of magnets 132, which are respectively located in the second cavity 17. The positioning plastic part 131 is in the shape of a ring, and a plurality of positioning grooves 1311 are spaced apart along the circumferential direction of one end of the positioning plastic part 131, and each magnet 132 is arranged in one positioning groove 1311.

[0092] Specifically, the length of the magnet 132 is less than the length of the first cylindrical protection structure 14 (the first side edge 1411 or the second side edge 1412).

[0093] Please refer to Figures 3-6 and Figure 11 In the embodiment, one end of the rotating shaft 15 is provided with a mounting portion 18, which has a cross-sectional dimension greater than that of the rotating shaft 15. The rotating shaft 15 passes through a through hole (not labeled in the figure) on the rotor base 12 and is arranged in the first cavity 16. The cross-sectional dimension of the through hole matches that of the rotating shaft 15 and is smaller than that of the mounting portion 18. Therefore, at this time, the mounting portion 18 abuts against the rotor base 12 and is connected to the rotor base 12 by screws or other means.

[0094] Specifically, an avoiding channel 22 is arranged through the upper and lower ends of the stator body 2, and the other end of the rotating shaft 15 is rotatably arranged in the avoiding channel 22.

[0095] More specifically, the surface of the rotating shaft 15 is provided with a protective structure 19, which is a plating layer with high hardness and can effectively reduce the wear caused by the frequent plugging and unplugging of the rotating shaft 15 in the avoiding channel 22.

[0096] Please refer to Figures 10-13 In the embodiment, the stator body 2 includes a stator core 23, a stator winding 24 arranged on the stator core 23, and a stator potting structure 25 on which the stator core 23 is arranged, and a first mounting channel 251 arranged through the two ends of the stator potting structure 25. The stator core 23 includes a main body part 231 and a plurality of stator teeth 232 extending outward from the main body part 231, the main body part 231 is hollow and arranged outside the first mounting channel 251, the adjacent stator teeth 232 are spaced apart by a predetermined distance, and the stator winding 24 is arranged on the stator teeth 232. The stator potting structure 25 fills the space between the adjacent stator teeth 232, and the stator winding 24 is wrapped by the stator potting structure 25.

[0097] The second cylindrical protective structure 21 is arranged on the surface of the stator teeth 232 of the stator core 23 and connected with the stator potting structure 25 to form a sealed structure. Please refer to Figures 14-16 The second cylindrical protective structure 21 includes a second sheet material 211, which includes a fifth side edge 2111, a sixth side edge 2112, a seventh side edge 2113, and an eighth side edge 2114, wherein the fifth side edge 2111 and the sixth side edge 2112 are spaced apart by a predetermined distance, and the seventh side edge 2113 and the eighth side edge 2114 are spaced apart by a predetermined distance.

[0098] Specifically, the fifth side edge 2111 and the sixth side edge 2112 of the second sheet material 211 are respectively linear, and the fifth side edge 2111 is respectively perpendicular to the seventh side edge 2113 and the eighth side edge 2114, and the sixth side edge 2112 is respectively perpendicular to the seventh side edge 2113 and the eighth side edge 2114, which is equivalent to that the second sheet material 211 as a whole is a rectangle or a square in visual effect. Herein, no limitation is made. The second sheet material 211 is bent into a cylindrical shape along the seventh side edge 2113 and the eighth side edge 2114, and the fifth side edge 2111 and the sixth side edge 2112 are connected with each other, thereby forming the second cylindrical protective structure 21. The connection mode of the fifth side edge 2111 and the sixth side edge 2112 can be welding, adhesive bonding, or other modes, and herein no limitation is made.

[0099] More specifically, when the fifth side edge 2111 and the sixth side edge 2112 are connected to each other, a connecting line L3 is formed at the connection of the fifth side edge 2111 and the sixth side edge 2112, and a central axis L4 is formed at the center point of the second cylindrical protection structure 21, and the connecting line L3 and the central axis L4 are parallel to each other.

[0100] Further, the second cylindrical protection structure 21 is made of metal or non-metal material, and as a preferred embodiment, the second cylindrical protection structure 21 is made of stainless steel.

[0101] Please refer to Figure 11 In the embodiment, the stator body 2 further comprises a stator cover 26, and the lower end surface of the stator cover 26 is provided with a mounting shaft 261, the mounting shaft 261 is arranged in the first mounting channel 251, and a second mounting channel 262 is respectively arranged through the mounting shaft 261 and the stator cover 26, the length of the second mounting channel 262 is less than that of the first mounting channel 251, and the second mounting channel 262 and the first mounting channel 251 are connected and combined to form the aforementioned avoiding channel 22.

[0102] Specifically, the two ends of the avoiding channel 22 are respectively provided with the first bearing 3 and the second bearing 4 (specifically, the first bearing 3 is arranged in the first mounting channel 251, and the second bearing 4 is arranged in the second mounting channel 262), and the first bearing 3 and the second bearing 4 are respectively connected with the rotating shaft 15, so as to effectively reduce the power loss when the rotating shaft 15 rotates, and at the same time, the axial positioning of the rotating shaft 15 can be maintained to ensure the position accuracy of the rotating shaft 15 in the axial direction.

[0103] More specifically, a quick release structure 27 is detachably arranged on the end surface of the upper end of the stator cover 26, and the quick release structure 27 is located in the opening of the second mounting channel 262 (equivalent to the upper end of the avoiding channel 22), when the external rotor motor 100 needs to be maintained, the second bearing 4 can be quickly replaced through the quick release structure 27.

[0104] In the embodiment, the side surface of the stator cover 26 is sleeved with the first waterproof sealing structure 5.

[0105] Please refer to Figures 10-11 In the embodiment, the surface of the mounting shaft 261 of the stator cover 26 is sleeved with the circuit board 6, and the circuit board 6 is provided with the contact pin 7. The upper end of the stator cover 26 has a protruding piece 263, and an electrical connection channel 2631 is respectively arranged through the stator cover 26 and the protruding piece 263, and the contact pin 7 is located in the electrical connection channel 2631.

[0106] Specifically, the side surface of the protruding piece 263 is sleeved with the second waterproof sealing structure 8.

[0107] The working principle of this utility model is described below to help you better understand it:

[0108] When current flows through the stator winding 24, a magnetic field is generated around the stator body 2. Because the magnitude and direction of the alternating current change continuously over time, the magnetic field generated by the stator body 2 also changes continuously; therefore, the magnetic field is a rotating magnetic field. Under the influence of this magnetic field, the magnet 132 of the rotor body 1 generates torque, causing the rotor body 1 to rotate relative to the stator body 2. When particles such as sand and gravel enter the external rotor motor 100, the rotor housing 11, in conjunction with the first cylindrical protective structure 14, encloses the magnet 132. A second cylindrical protective structure 21 is fitted onto the outer surface of the stator body 2, enclosing the stator winding 24. Therefore, the sand and gravel cannot damage the magnet 132 and the stator winding 24, thus protecting them and allowing the magnet 132 and stator winding 24 to continuously perform electromagnetic effects, enabling the external rotor motor 100 to operate continuously.

[0109] Please refer to Figures 17-19 , Figure 17 This is a schematic diagram of the planar structure of the first sheet material 141 before bending in the second embodiment of this utility model. Figure 18 This is a schematic diagram of the planar structure of the first sheet material 141 after bending. Figure 19 This is a three-dimensional structural schematic diagram of the first cylindrical protective structure 14. The difference between the second embodiment and the first embodiment lies in the change of the structure of the first sheet material 141, specifically:

[0110] In this embodiment, a plane a is provided along the horizontal direction of the first sheet material 141, and plane a is parallel to the first sheet material 141. Before the first sheet material 141 is bent, the projection of the first sheet material 141 onto plane a is a parallelogram shape (e.g., ...). Figure 17 It can also be other shapes, which are not limited here. When the first side 1411 and the second side 1412 are connected, the connection point of the first side 1411 and the second side 1412 forms a connecting line L1 (e.g., Figure 18 (A plan view of the structure after the first sheet material 141 is bent to form the first cylindrical protective structure 14.) Figure 18 ) and three-dimensional structure diagram ( Figure 19 From the perspective of plane a, the projection of connecting line L1 onto plane a forms an angle D1 with the projection of the central axis L2 of the first cylindrical protective structure 14 onto plane a. The angle D1 is greater than 0° and less than 90°. The specific degree of the angle is not limited here and is determined by the actual working conditions.

[0111] Other technical features and effects are consistent with the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16The explanation content.

[0112] Please refer to Figures 20-21 , Figure 20 This is a schematic diagram of the planar structure of the first sheet material 141 before bending in the third embodiment of this utility model. Figure 21 This is a schematic diagram of the planar structure of the first sheet material 141 after bending. The difference between the third embodiment and the first embodiment lies in the change of the structure of the first sheet material 141, specifically:

[0113] In this embodiment, please refer to Figure 20 When the first sheet material 141 is not bent to form the first cylindrical protective structure 14, the first side 1411 and the second side 1412 are respectively non-linear, and can be curved or lines of other shapes, which are not limited here.

[0114] At least one first protruding structure 14111 is provided on the first side 1411, and at least one first recessed structure 14121 is provided on the second side 1412. The position of the first recessed structure 14121 corresponds to the position of the first protruding structure 14111, and the shape and size of the first recessed structure 14121 are substantially the same as the shape and size of the first protruding structure 14111. When the first side 1411 and the second side 1412 are connected together, the first protruding structure 14111 and the first recessed structure 14121 are interlocked (equivalent to the first side 1411 and the second side 1412 being interlocked), and at this time, the first sheet material 141 is bent to form the first cylindrical protective structure 14.

[0115] Compared to setting the first side 1411 and the second side 1412 as straight lines, setting them as non-straight lines has the advantage that, after welding the conventional straight first side 1411 and the second side 1412, the shrinkage stress generated during the metal's cooling process is relatively concentrated, easily forming stress concentration points at the joint and thus causing cracks. However, by setting the first side 1411 and the second side 1412 as non-straight lines, the stress can be dispersed along a non-straight path, avoiding excessive stress concentration at any one point, thereby improving the fatigue resistance of the first sheet material 141.

[0116] Other technical features and effects are consistent with the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 The explanation content.

[0117] Please refer to Figures 22-23 , Figure 22 This is a schematic diagram of the planar structure of the first sheet material 141 before bending in the fourth embodiment of this utility model. Figure 23This is a schematic diagram of the planar structure of the first sheet material 141 after bending. The difference between the fourth embodiment and the third embodiment lies in the change of the structure of the first sheet material 141, specifically:

[0118] In this embodiment, at least one second recessed structure 14112 is provided on the first side 1411, and at least one second protruding structure 14122 is provided on the second side 1412. The position of the second protruding structure 14122 corresponds to the position of the second recessed structure 14112, and the shape and size of the second protruding structure 14122 are substantially the same as the shape and size of the second recessed structure 14112. When the first side 1411 and the second side 1412 are connected together, the second protruding structure 14122 and the second recessed structure 14112 are interlocked (equivalent to the first side 1411 and the second side 1412 being interlocked). At this time, the first sheet material 141 is bent to form the first cylindrical protective structure 14.

[0119] Other technical features and effects are consistent with those of the third embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 The explanation content.

[0120] Please refer to Figure 24 , Figure 24 This is a three-dimensional structural diagram of the fifth embodiment of the present invention. The difference between the fifth embodiment and the first embodiment lies in the change of the structure of the first cylindrical protective structure 14, specifically:

[0121] In this embodiment, the first cylindrical protective structure 14 is integrally formed, meaning that its shape is already cylindrical during manufacturing. The advantages of this structure are: 1. It avoids stress concentration and cracking caused by welding. 2. It eliminates the need for precise control of welding parameters; as long as the mold for the first cylindrical protective structure 14 is appropriate, rapid and mass production is possible.

[0122] Other technical features and effects are consistent with the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 The explanation content.

[0123] Please refer to Figures 25-26 , Figure 25 This is a cross-sectional view of the rotor body 1 in the sixth embodiment of this utility model. Figure 26 This is an enlarged schematic diagram of the rotor body at point B. The difference between the sixth embodiment and the first embodiment lies in the change of the structure of the magnetic structure 13, specifically:

[0124] In this embodiment, the positioning plastic part 131 is removed, and the magnet 132 is directly attached to the inner wall of the rotor housing 11. The specific attachment method can be by adhesive or potting, etc., which is not limited here. The advantage of this structure is that it reduces manufacturing costs and has a simple structure.

[0125] Other technical features and effects are consistent with the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 The explanation content.

[0126] Please refer to Figure 27 , Figure 27 This is an exploded structural diagram of the rotor body 1 in the seventh embodiment of this utility model. The difference between the seventh embodiment and the sixth embodiment lies in the change of the arrangement of the magnet 132, specifically:

[0127] In this embodiment, a plurality of grooves 111 are provided at intervals along the circumferential direction of the inner wall of the rotor housing 11, and the depth of the grooves 111 is basically the same as the thickness of the magnet 132. The magnet 132 is placed in the grooves 111 and the magnet 132 is firmly pressed into the grooves 111 by the first cylindrical protective structure 14.

[0128] The advantages of this structure are: 1. It eliminates the need for additional positioning structures, reducing costs. 2. It allows for rapid and mass production with only a reasonable mold for the rotor housing 11. 3. The structure is simple and also solves the problem of separating multiple magnets 132.

[0129] Other technical features and effects are consistent with those of the sixth embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 , Figure 25 and Figure 26 The explanation content.

[0130] Please refer to Figure 28 , Figure 28 This is an exploded structural diagram of the rotor body 1 in the eighth embodiment of this utility model. The difference between the eighth embodiment and the sixth embodiment lies in the change of the arrangement of the magnet 132, specifically:

[0131] In this embodiment, a plurality of protrusions 112 are spaced apart along the circumferential direction of the inner wall of the rotor housing 11, and the spacing between two adjacent protrusions 112 is basically the same as the width of the magnet 132. Each magnet 132 is disposed between two adjacent protrusions 112.

[0132] The advantages of this structure are: 1. It eliminates the need for additional positioning structures, reducing costs. 2. It allows for rapid and mass production with only a reasonable mold for the rotor housing 11. 3. The structure is simple and also solves the problem of separating multiple magnets 132.

[0133] Other technical features and effects are consistent with those of the sixth embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 , Figure 25 and Figure 26 The explanation content.

[0134] Please refer to Figures 29-31 , Figure 29 This is a schematic diagram of the planar structure of the second sheet material 211 before bending in the ninth embodiment of this utility model. Figure 30 This is a schematic diagram of the planar structure of the second sheet material 211 after bending. Figure 31 This is a schematic diagram of the three-dimensional structure of the second sheet material 211 after bending. The difference between the ninth embodiment and the first embodiment lies in the change of the structure of the second sheet material 211, specifically:

[0135] In this embodiment, a plane b is provided along the horizontal direction of the second sheet material 211, and plane b is parallel to the second sheet material 211. Before the second sheet material 211 is bent, the projection of the second sheet material 211 onto plane b is a parallelogram (e.g., ...). Figure 29 It can also be other shapes, which are not limited here. When the fifth side 2111 and the sixth side 2112 are connected, the connection point of the fifth side 2111 and the sixth side 2112 forms a connecting line L3 (such as...). Figure 30 A plan view of the second sheet material 211 after bending to form the second cylindrical protective structure 21. Figure 30 From the three-dimensional structural diagram (i.e.) Figure 31 The projection of connecting line L3 onto plane b forms an angle D2 with the projection of the central axis L4 of the second cylindrical protective structure 21 onto plane b. The angle D2 is greater than 0° and less than 90°. The specific degree of the angle is not limited here and is determined by the actual working conditions.

[0136] Other technical features and effects are consistent with the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 The explanation content.

[0137] Please refer to Figures 32-33 , Figure 32 This is a schematic diagram of the planar structure of the second sheet material 211 before bending in the tenth embodiment of this utility model. Figure 33 This is a schematic diagram of the planar structure of the second sheet material 211 after bending. The difference between the tenth embodiment and the first embodiment lies in the change of the structure of the second sheet material 211, specifically:

[0138] In this embodiment, the fifth side 2111 and the sixth side 2112 are non-linear, and can be curved or lines of other shapes, which are not limited here.

[0139] At least one third protruding structure 21111 is provided on the fifth side 2111, and at least one third recessed structure 21121 is provided on the sixth side 2112. The position of the third recessed structure 21121 corresponds to the position of the third protruding structure 21111, and the shape and size of the third recessed structure 21121 are basically the same as those of the third protruding structure 21111. When the fifth side 2111 and the sixth side 2112 are connected together, the third protruding structure 21111 and the third recessed structure 21121 are interlocked (equivalent to the fifth side 2111 and the sixth side 2112 being interlocked). At this time, the second sheet material 211 is bent to form the second cylindrical protective structure 21.

[0140] Compared to setting the fifth side 2111 and the sixth side 2112 as straight lines, setting them as non-straight lines has the advantage that, after welding the conventional straight fifth side 2111 and sixth side 2112, the shrinkage stress generated during the metal's cooling process is relatively concentrated, easily forming stress concentration points at the joint, thus causing cracks. Setting the fifth side 2111 and sixth side 2112 as non-straight lines disperses the stress along a non-straight path, avoiding excessive stress concentration at any one point, thereby improving the fatigue resistance of the first sheet material 141.

[0141] Other technical features and effects are consistent with the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 The explanation content.

[0142] Please refer to Figures 34-35 , Figure 34 This is a schematic diagram of the planar structure of the second sheet material 211 before bending in the eleventh embodiment of this utility model. Figure 35 This is a schematic diagram of the planar structure of the second sheet material 211 after bending. The difference between the eleventh embodiment and the tenth embodiment lies in the change of the structure of the first sheet material 141, specifically:

[0143] In this embodiment, at least one fourth recessed structure 21112 is provided on the fifth side 2111, and at least one fourth protruding structure 21122 is provided on the sixth side 2112. The position of the fourth protruding structure 21122 corresponds to the position of the fourth recessed structure 21112, and the shape and size of the fourth protruding structure 21122 are substantially the same as the shape and size of the fourth recessed structure 21112. When the fifth side 2111 and the sixth side 2112 are connected together, the fourth protruding structure 21122 and the fourth recessed structure 21112 are interlocked (equivalent to the fifth side 2111 and the sixth side 2112 being interlocked).

[0144] Other technical features and effects are consistent with those of the tenth embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 , Figure 32 and Figure 33 The explanation content.

[0145] Please refer to Figure 36 , Figure 36 This is a perspective view of the second cylindrical protective structure 21 in the twelfth embodiment of this utility model. The difference between the twelfth embodiment and the first embodiment lies in the change of the structure of the second cylindrical protective structure 21, specifically:

[0146] In this embodiment, the second cylindrical protective structure 21 is integrally formed, meaning that its shape is already cylindrical during manufacturing. The advantages of this structure are: 1. It avoids stress concentration and cracking caused by welding. 2. It eliminates the need for precise control of welding parameters; as long as the mold for the second cylindrical protective structure 21 is appropriate, rapid and mass production is possible.

[0147] Other technical features and effects are consistent with the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-16 The explanation content.

Claims

1. An external rotor electric machine characterized by, The outer rotor motor comprises a rotor body and a stator body. The rotor body comprises a rotor shell, a rotor base, a magnetic structure, a first cylindrical protective structure and a rotating shaft. The rotor shell is arranged on the rotor base at one end and cooperates with the rotor base to form a first cavity. The rotating shaft is arranged in the first cavity and connected to the rotor base at one end. The first cylindrical protective structure is arranged in the first cavity and forms a second cavity between the outer wall of the first cylindrical protective structure and the inner wall of the rotor shell. The magnetic structure is arranged in the second cavity. The stator body is arranged in the first cavity. The outer surface of the stator body is sleeved with a second cylindrical protective structure. The inner wall of the first cylindrical protective structure is arranged opposite to the outer wall of the second cylindrical protective structure and spaced by a predetermined distance.

2. The outer rotor motor according to claim 1, wherein: The first cylindrical protective structure is integrally formed.

3. The outer rotor motor according to claim 1, wherein: The first cylindrical protective structure comprises a first sheet material. The first sheet material comprises a first side edge, a second side edge, a third side edge and a fourth side edge. The first sheet material is curved into a cylindrical shape. The third side edge and the fourth side edge are oppositely spaced by a predetermined distance. The first side edge and the second side edge are connected to each other.

4. The outer rotor motor according to claim 3, wherein: The first side edge and the second side edge are respectively in a straight line shape.

5. The outer rotor motor according to claim 4, wherein: A connecting line formed at the connection of the first side edge and the second side edge is parallel to the central axis of the first cylindrical protective structure.

6. The outer rotor motor according to claim 4, wherein: In a vertical projection plane, the projection of the connecting line formed at the connection of the first side edge and the second side edge forms an angle with the projection of the central axis of the first cylindrical protective structure.

7. The outer rotor motor according to claim 3, wherein: The first side edge and the second side edge are respectively in a non-straight line shape. When the first side edge and the second side edge are connected together, the first side edge and the second side edge are in an occlusion shape.

8. The outer rotor motor according to claim 7, wherein: At least one first protruding structure is arranged on the first side edge. At least one first recess structure is arranged at the corresponding position of the second side edge. When the first side edge and the second side edge are connected together, the first protruding structure and the first recess structure are in an occlusion shape.

9. The outer rotor motor according to claim 7, wherein: At least one second recess structure is arranged on the first side edge. At least one second protruding structure is arranged at the corresponding position of the second side edge. When the first side edge and the second side edge are connected together, the second protruding structure and the second recess structure are in an occlusion shape.

10. The outer rotor motor according to claim 1, wherein: One end of the first cylindrical protection structure is provided with a bending part, the edge of the bending part is connected with the inner wall of the rotor shell, and the inner wall of the rotor shell, the outer wall of the bending part and the outer wall of the first cylindrical protection structure cooperate to form the second cavity.

11. The external rotor motor of claim 1, wherein: The magnetic structure comprises a plurality of magnets, and the plurality of magnets are arranged in the second cavity.

12. The external rotor motor of claim 11, wherein: A plurality of grooves are arranged along the circumferential direction of the inner wall of the rotor shell, and the magnets are arranged in the grooves.

13. The external rotor motor of claim 11, wherein: A plurality of protrusions are arranged along the circumferential direction of the inner wall of the rotor shell, and the magnets are arranged between two adjacent protrusions.

14. The external rotor motor of claim 11, wherein: The magnetic structure further comprises a positioning plastic part, the positioning plastic part is in the shape of a ring, a plurality of positioning grooves are arranged along the circumferential direction of one end of the positioning plastic part, and the magnets are arranged in the positioning grooves.

15. The external rotor motor of claim 1, wherein: The second cylindrical protection structure is integrally formed.

16. The external rotor motor of claim 1, wherein: The second cylindrical protection structure comprises a second sheet material, the second sheet material comprises a fifth side, a sixth side, a seventh side and an eighth side, the second sheet material is curved into a cylindrical shape, the seventh side and the eighth side are oppositely spaced apart by a predetermined distance, and the fifth side and the sixth side are connected to each other.

17. The external rotor motor of claim 16, wherein: The fifth side and the sixth side are respectively in the shape of a straight line.

18. The external rotor motor of claim 17, wherein: A connecting line formed at the connection of the fifth side and the sixth side is parallel to the central axis of the second cylindrical protection structure.

19. The external rotor motor of claim 17, wherein: In a vertical projection plane, the projection of the connecting line formed at the connection of the fifth side and the sixth side forms an angle with the projection of the central axis of the second cylindrical protection structure.

20. The external rotor motor of claim 16, wherein: The fifth side and the sixth side are respectively in the shape of a non-straight line, and when the fifth side and the sixth side are connected together, the fifth side and the sixth side are in the shape of a bite.

21. The external rotor motor of claim 20, wherein: At least one third protruding structure is arranged on the fifth side, and at least one third recessed structure is arranged at the corresponding position of the sixth side; when the fifth side and the sixth side are connected together, the third protruding structure and the third recessed structure are in the shape of a bite.

22. The external rotor motor of claim 20, wherein: At least one fourth recessed structure is arranged on the fifth side edge, and at least one fourth protruding structure is arranged on the sixth side edge in the corresponding position; when the fifth side edge and the sixth side edge are connected together, the fourth protruding structure and the fourth recessed structure are in engagement.

23. The external rotor electric machine of any one of claims 15-22, wherein: The stator body comprises a stator core, a stator winding and a stator potting structure, the stator core is arranged on the stator winding, and the stator winding is arranged on the stator potting structure.

24. The external rotor electric machine of claim 1, wherein: An avoiding channel is arranged through the upper and lower ends of the stator body, and the rotating shaft is rotatably arranged in the avoiding channel.

25. The external rotor electric machine of claim 24, wherein: First and second bearings are arranged at the two ends of the avoiding channel respectively, and the first and second bearings are connected with the rotating shaft respectively.

26. The external rotor electric machine of claim 25, wherein: A quick release structure is detachably arranged on the end face of the upper end of the stator body and located in the opening of the upper end of the avoiding channel.

27. The external rotor electric machine of any one of claims 2, 3, 15 or 16, wherein: The first and / or second cylindrical protective structures are made of metal or non-metal wear-resistant materials.

28. The external rotor electric machine of claim 1, wherein: The surface of the rotating shaft is provided with a protective structure.

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