Outer rotor assembly, outer rotor motor and manufacturing method

Abstract

The application provides an outer rotor assembly, an outer rotor motor and a manufacturing method. The outer rotor assembly comprises a rotor core, tangential magnetic steel and a first plastic package. The rotor core comprises a plurality of core parts which are uniformly and spacedly arranged around a central axis. In a circular state, two adjacent core parts form a magnetic steel slot. The magnetic steel slot penetrates a radial inner circular surface and a radial outer circular surface of the rotor core along a radial direction of the rotor core. Each tangential magnetic steel corresponds to each magnetic steel slot. The first plastic package at least wraps a radial outer peripheral wall and an axial end wall of each core part and each tangential magnetic steel. The application reduces the magnetic leakage of the motor, improves the performance of the motor, significantly improves the utilization rate of the permanent magnet material of the outer rotor motor, improves the power density of the motor, thereby reducing the amount of copper wire and reducing the cost of the motor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of motor manufacturing, and particularly relates to an outer rotor assembly, an outer rotor motor and a manufacturing method. BACKGROUND

[0002] Compared with an inner rotor motor with the same motor external diameter, the outer rotor motor has a larger air gap diameter, and since the torque is proportional to the square of the air gap diameter, the outer rotor motor has a larger output torque, the motor length can be reduced, the weight is lighter, and in addition, the high rotational inertia of the outer rotor structure effectively reduces torque fluctuation and vibration noise, and the outer rotor motor has been widely used in the fields of fans, electric vehicle hub motors, washing machines and the like.

[0003] As shown in the prior art, the rotor of a conventional outer rotor motor is usually composed of a magnetic ring, an iron shell and a rotating shaft, the magnetic ring is generally radially magnetized and fixed in the iron shell, the iron shell serves as a magnetic guide and drives the rotating shaft, only the magnetic poles on the inner diameter surface of the magnetic ring are coupled with the magnetic field of the stator to generate torque, the utilization rate of the permanent magnet material is low, and the greater the thickness of the magnetic ring, the less the performance of the motor is effectively improved, resulting in low power density of the motor; more turns of copper wire are required to improve the performance of the motor, resulting in high cost of the motor. Figure 1 The existing tangential outer rotor assembly usually adopts a whole outer rotor core or a split outer rotor core composed of multiple core parts that are spliced into a circle, and since there is a connecting part between the two adjacent core parts, the connecting part forms a magnetic bridge, which causes the existing outer rotor assembly to have a serious magnetic leakage phenomenon, thereby reducing the performance of the outer rotor motor. SUMMARY

[0004] Therefore, the present application provides an outer rotor assembly, an outer rotor motor and a manufacturing method, which can solve the technical problem that the existing outer rotor rotor assembly has a serious magnetic leakage phenomenon due to the magnetic bridge structure, thereby reducing the performance of the outer rotor motor.

[0005] In order to solve the above problems, the present application provides an outer rotor assembly, which comprises a rotor core, tangential magnetic steel and a first plastic package, the rotor core comprises multiple core parts that are uniformly and spacedly arranged around a central axis, in a circular state, two adjacent core parts form a magnetic steel slot, the magnetic steel slot penetrates the radial inner surface and the radial outer surface of the rotor core from inside to outside along the radial direction of the rotor core, each tangential magnetic steel corresponds to each magnetic steel slot, and the first plastic package at least wraps the radial outer circumferential wall and the axial end wall of each core part and each tangential magnetic steel.

[0006] In some embodiments, the iron core sub-body is formed by stacking a plurality of iron core punches, and the iron core radial inner side surface of the iron core punch matches the iron core radial outer side surface. The iron core punch is cut by a cutting seam when the iron core punch is in a layout state.

[0007] In some embodiments, each of the iron core punches has a first central symmetry plane in the diameter direction of the rotor core. The iron core punch includes a punch body, and a radially inner end of the punch body has an inner side magnet block extending to both sides of the iron core punch along the circumferential direction of the rotor core. A radially inner side surface of the inner side magnet block and a radially inner side surface of the punch body jointly form the iron core radial inner side surface. The iron core punch is projected on any radial plane of the rotor core, and a projection of the iron core radial inner side surface includes an inner side circular arc segment and inner side straight line segments at both ends of the circumferential direction of the inner side circular arc segment. The inner side straight line segments are perpendicular to the first central symmetry plane, and a radius of the inner side circular arc segment is R 内 . The rotor core has 2p pole numbers, and the circumferential distance between the inner side magnet blocks of any two adjacent iron core punches is a pole opening width B 极口 . The distance between the inner side straight line segments and the center of the rotor core is a tangent angle height h 切角 ,

[0008] In some embodiments, the length of the inner side straight line segment is L3, and the maximum distance between the inner side magnet blocks on both sides of the same iron core punch is B2,

[0009] In some embodiments, a radially outer end of the punch body has an outer side magnet block extending to both sides of the iron core punch along the circumferential direction of the rotor core. A radially outer side surface of the outer side magnet block and a radially outer side surface of the punch body jointly form the iron core radial outer side surface. A side surface of the outer side magnet block facing the inner side magnet block is a first plane, a side surface of the inner side magnet block facing the outer side magnet block is a second plane, the first plane and the second plane on the same circumferential side of the punch body are parallel, and the first plane is not perpendicular to the first central symmetry plane. The magnet slot has a second central symmetry plane in the diameter direction of the rotor core. The first plane and the second plane corresponding to the magnet slot of any two adjacent iron core punches are both perpendicular to the second central symmetry plane.

[0010] In some embodiments, the outer rotor assembly further comprises a rotating shaft and a connecting shell, the connecting shell has a shaft hole and a connecting leg matched with the end face of the shaft end of the rotor core, the rotating shaft is connected with the connecting shell through the shaft hole, and the connecting leg is wrapped in the first plastic body to realize the sealed connection between the connecting shell and the rotor core.

[0011] In some embodiments, the connecting leg has a plurality of connecting legs, each of the connecting legs is arranged one-to-one corresponding to each of the cores, the core punching sheet has a plastic connection hole penetrating through the two side end faces, the core punching sheet has a positioning hole penetrating through the two side end faces, the positioning hole can limit the circumferential rotation of the core punching sheet, each of the connecting legs has a first hole corresponding to the plastic connection hole and a second hole corresponding to the positioning hole.

[0012] The application also provides an outer rotor motor, which comprises a stator assembly and an outer rotor assembly sleeved on the radially outer side of the stator assembly, the outer rotor assembly is the outer rotor assembly described above, and the stator assembly comprises a stator assembly and a second plastic body wrapped on the radially outer side and the axial both ends of the stator assembly.

[0013] In some embodiments, the second plastic body comprises a shell wrapping part wrapped on the radially outer side of the stator assembly, the shell wrapping part is formed with a matched ring groove, the groove opening of the matched ring groove faces the outer rotor assembly, the outer peripheral wall part of the first plastic body corresponding to the non-shaft end of the rotor core is located in the matched ring groove, further comprising a sealing rubber ring, the sealing rubber ring is arranged between the outer peripheral wall of the first plastic body and the radially outer side groove vertical wall of the matched ring groove; and / or, the second plastic body is formed with a motor mounting leg; and / or, the stator assembly comprises a stator core, the center of the tooth top arc surface of the stator tooth of the stator core is located on the side of the center of the stator core close to the stator tooth.

[0014] In some embodiments, the sealing rubber ring comprises an inner ring wall and an outer ring wall arranged at intervals along the diameter of the rotor core, the inner ring wall and the outer ring wall are connected through a sealing plate, the inner ring wall is sleeved on the outer peripheral wall of the first plastic body, the outer ring wall and the radially outer side groove vertical wall of the matched ring groove form a gap δ, 0.1mm≤δ≤0.5mm; and / or, the outer peripheral wall surface of the first plastic body is provided with a positioning ring table at a position close to the non-shaft end face of the rotor core, and the axial one end of the sealing rubber ring is in abutting connection with the positioning ring table.

[0015] In some embodiments, the inner ring wall, the outer ring wall and the sealing plate form a sealing rubber ring with an opening, and the opening of the sealing rubber ring faces the shaft end side of the rotor core.

[0016] In some embodiments, when the outer rotor motor is in use, the central axis of the rotating shaft is in a horizontal plane, the radial outer slot vertical wall is a flared structure that flares towards the side close to the shaft end of the rotor core, the single-side flared angle of the flared structure is α, and 5° < α ≤ 30°; and / or, the horizontal distance between the outer end surface of the radial outer slot vertical wall and the outer end surface of the outer ring wall is d, and 1 mm < d ≤ 10 mm.

[0017] In some embodiments, the radial outer slot vertical wall comprises a first water retaining slope and a second water retaining slope, the first water retaining slope and the second water retaining slope are sequentially arranged along the axial direction of the rotating shaft from the non-shaft end to the shaft end of the rotor core, the maximum inner diameter of the first water retaining slope is smaller than the minimum inner diameter of the second water retaining slope, and the second water retaining slope is arranged in position corresponding to the outer ring wall.

[0018] In some embodiments, the second plastic covering body comprises a first end plate covering the end of the stator assembly away from the shaft end of the rotor core, the first end plate is formed with a first bearing chamber, the second plastic covering body comprises a second end plate covering the end of the stator assembly close to the shaft end of the rotor core, the second end plate is formed with a second bearing chamber, the rotating shaft is rotatably supported in the first bearing chamber by a first bearing and rotatably supported in the second bearing chamber by a second bearing.

[0019] In some embodiments, the stator assembly comprises a stator core, the end surface of the stator core away from the shaft end of the rotor core is formed with a supporting ring surface, the supporting ring surface is coaxially arranged with the first bearing chamber, and the ring surface width of the supporting ring surface is w, and 3 mm < w.

[0020] The application also provides a manufacturing method of the outer rotor assembly, characterized in that the method comprises the following steps:

[0021] Each of the core parts is placed in a preset position in the mold cavity of the injection mold to form a circular state, and a preset height is ensured between the bottom end surface of each of the core parts and the cavity bottom wall of the mold cavity, and a preset interval is ensured between the outer side surface of each of the core parts and the cavity vertical wall of the mold cavity.

[0022] The connecting shell is placed on the top surface of each of the core parts, so that each of the connecting feet of the connecting shell corresponds to each of the core parts.

[0023] The plastic covering material is injected into the mold cavity to form the outer rotor assembly.

[0024] The outer rotor assembly, the outer rotor motor and the manufacturing method provided by the application have the following beneficial effects:

[0025] The outer rotor core is formed by assembling a plurality of core segments separated from each other, and there is no magnetic bridge between two adjacent core segments, so that there is substantially no magnetic leakage path, the magnetic leakage of the motor is greatly reduced, and the performance of the motor is improved. The tangential magnetic steel can utilize both of its positive and negative poles (N pole and S pole), so that the utilization rate of the permanent magnet material of the outer rotor motor is significantly improved, the power density of the motor is improved, the amount of copper wire is reduced, and the cost of the motor is reduced. Meanwhile, the first plastic wrapping body 7 is used to wrap and connect each core segment and the tangential magnetic steel into a whole, so that the structure is simple and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only exemplary, and other embodiments can be derived from the provided drawings without creative labor for those skilled in the art.

[0027] Figure 1 is a schematic diagram of the internal structure of the outer rotor motor in the prior art;

[0028] Figure 2 is a schematic diagram of the punching layout of the segmented inner rotor core in the prior art;

[0029] Figure 3 is a schematic diagram of the structure of the rotor core in the circular state (radial plane projection view, containing the stator core, and the first plastic wrapping body is not shown), and the arrow in the figure shows the direction of the magnetic force line;

[0030] Figure 4 is a schematic diagram of the structure of the rotor core in the circular state (radial plane projection view, not containing the stator core)

[0031] Figure 5 is a schematic diagram of the structure of the core segment in Figure 4

[0032] Figure 6 is a schematic diagram of the punching layout of the core segment in the present application (i.e. in the layout state);

[0033] Figure 7 is a schematic diagram of the torque fluctuation (i.e. torque ripple) of the motor using the corner cutting structure of the present application and the motor not using the corner cutting structure of the present application;

[0034] Figure 8 is a structure exploded view (partially sectioned) of the outer rotor motor of another embodiment of the present application;

[0035] Figure 9 is​Figure 8 A schematic diagram of the three-dimensional structure of the outer rotor assembly at one angle (partial cross-section, the shaft is not assembled);

[0036] Figure 10 yes Figure 8 A schematic diagram of the three-dimensional structure of the outer rotor assembly at another angle (partial cross-section);

[0037] Figure 11 yes Figure 8 A schematic diagram of the three-dimensional structure of the stator assembly at a certain angle (partial cross-section);

[0038] Figure 12 yes Figure 8 A schematic diagram of the three-dimensional structure of the stator assembly at another angle (partial cross-section);

[0039] Figure 13 1 is a schematic diagram of the internal structure of an outer rotor motor according to an embodiment of the present invention;

[0040] Figure 14 yes Figure 13 A partial enlarged view of point A in the middle.

[0041] The accompanying drawings are:

[0042] 1. Rotor core; 11. Core punching sheet; 111. Punching sheet body; 1111. Inner arc segment; 1112. Inner straight segment; 1113. Outer arc segment; 1114. Outer straight segment; 112. Inner magnet block; 113. Outer magnet block; 12. Magnetic steel slot; 131. Plastic-coated connecting hole; 132. Positioning hole; 2. Tangential magnetic steel; 21. Polarity distinguishing mark; 3. Rotating shaft; 32. Spring washer; 33. First retaining ring; 34. Second retaining ring; 4. Stator assembly; 41. Second plastic-coated body; 411. Matching ring groove; 4111. First water retaining slope ; 4112, second water retaining slope; 412, motor mounting foot; 413, first bearing chamber; 414, second bearing chamber; 421, stator core; 422, insulation frame; 423, stator winding; 5, sealing rubber ring; 51, inner ring wall; 52, outer ring wall; 53, sealing plate; 61, first bearing; 62, second bearing; 7, first plastic package; 71, positioning ring platform; 72, injection molding support positioning hole; 73, magnetic steel support hole; 8, connecting shell; 81, connecting foot; 811, first hole; 812, second hole; 82, shaft hole; 83, bending ring structure. DETAILED DESCRIPTION

[0043] Clearly, the embodiments described are only a part of all the embodiments of the present application, rather than all the embodiments. The following description of at least one example embodiment is merely illustrative in nature and does not limit the present application or its applications or uses in any way. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0044] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0045] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Therefore, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0046] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0047] For reference Figures 1 to 14As shown, according to the embodiment of the present application, an outer rotor assembly is provided, comprising a rotor core 1, tangential magnetic steels 2 and a first plastic body 7, the rotor core 1 comprises a plurality of core parts (not shown in the figure) which are uniformly spaced around the central axis (not shown in the figure) of the rotor core 1, and in the circular state, a magnetic steel slot 12 is formed between two adjacent core parts, the magnetic steel slot 12 penetrates the radial inner and outer circular surfaces of the rotor core 1 along the radial direction of the rotor core 1, each tangential magnetic steel 2 corresponds to each magnetic steel slot 12, and the first plastic body 7 at least wraps the radial outer peripheral wall and the axial end wall of each core part and each tangential magnetic steel 2. It can be understood that the magnetic poles on the opposite sides of two adjacent tangential magnetic steels 2 are the same, that is, the polarities on the opposite sides of two adjacent tangential magnetic steels 2 are opposite, see the specific description of Figure 3 As shown, the magnetization direction of each tangential magnetic steel 2 is along the tangential direction of the rotor, and the polarities on the circumferential sides of two adjacent tangential magnetic steels 2 are one of N-pole and S-pole, respectively, and the rotor core has positive and negative alternating polarities in the circumferential direction, which interacts with the stator core 421 to generate torque, and the first plastic body 7 can be made of PA66 (polyhexamethylene adipamide, nylon-66) and PBT (polybutylene terephthalate).

[0048] In this technical solution, the outer rotor core is formed by assembling a plurality of core parts separated from each other in a circle, and there is no magnetic bridge connection between two adjacent core parts, so that there is basically no magnetic leakage path, which greatly reduces the magnetic leakage of the motor and improves the performance of the motor. The tangential magnetic steel 2 can utilize both positive and negative poles (N-pole and S-pole), which can significantly improve the utilization rate of permanent magnet material of the outer rotor motor and improve the power density of the motor, thereby reducing the amount of copper wire and reducing the cost of the motor. At the same time, the first plastic body 7 is used to connect each core part and the tangential magnetic steel 2 as a whole, which has a simple structure and improves the production efficiency.

[0049] In addition, it should be noted that the back electromotive force of the traditional outer rotor motor is limited to the thickness of the magnetic ring, and when the thickness of the magnetic ring increases to a certain thickness, the back electromotive force no longer increases. The embedded tangential permanent magnet (i.e. the aforementioned tangential magnetic steel 2) of the outer rotor of the present application has high utilization rate, larger air gap magnetic flux density, and the radial lengthening of the permanent magnet can effectively increase the air gap magnetic flux density, thereby improving the power density of the outer rotor motor.

[0050] In some embodiments, the core sub-body is formed by stacking a plurality of core punching pieces 11, the core radial inner side surface (not labeled in the figure) and the core radial outer side surface (not labeled in the figure) of the core punching piece 11 can match, in the layout state of each core punching piece 11, the core radial inner side surface and the core radial outer side surface of the core punching piece 11 are formed by a cutting seam, at this time, it can be understood that the shape and size of the core radial inner side surface and the core radial outer side surface of the core punching piece 11 are the same, and since each core sub-body is formed by stacking the same core punching piece 11, the shape of each core sub-body is the same as the shape and size of each core punching piece 11 when projected on the radial surface of the rotor core 1.

[0051] In the technical solution, since the shape and size of the core radial inner side surface and the core radial outer side surface of the core punching piece 11 match, when the core punching piece 11 is laid out and punched, a plurality of core punching pieces 11 can be closely laid out along the length direction of the core punching piece 11, that is, the core radial inner side surface of one core punching piece 11 and the core radial outer side surface of another adjacent core punching piece 11 can be formed by a punch, that is, the structure design of the core punching piece 11 in the application realizes close layout of at least two adjacent core punching pieces 11 in one direction, and there is no excess edge in this area, so no waste is generated during punching, thereby greatly improving the material utilization rate of silicon steel sheets and reducing the waste rate. In addition, it should be noted that since the outer rotor core of the application is a block structure, there is no magnetic bridge connection between the two adjacent core sub-bodies, and there is basically no magnetic leakage path, which greatly reduces the magnetic leakage of the motor and improves the performance of the motor.

[0052] Specifically referring to Figure 6 shown, with Figure 6 the core radial inner side surface of the core punching piece 11 in the upper position directly abutting the core radial outer side surface of the core punching piece 11 in the lower position and adjacent to it, that is, a gap of a certain shape is cut on a whole silicon steel sheet to form it, and almost no waste is generated. In comparison, referring to the traditional block type inner rotor core punching piece layout shown in Figure 2 It can be seen that there are many excess edge regions, which will objectively form waste.

[0053] In a preferred embodiment, in some embodiments, each of the core laminations 11 has a first central symmetry plane (not labeled in the figure) in the diameter direction of the rotor core 1, that is, the core lamination 11 is symmetrical about the first central symmetry plane, the core lamination 11 comprises a lamination body 111, the radially inner end of the lamination body 111 has an inner side magnet stop 112 extending to both sides of the core lamination 11 along the circumferential direction of the rotor core 1, in particular, the aforementioned inner side magnet stop 112 and the lamination body 111 are integrally punched, and the radially outer sides of the two inner side magnet stops 112 close to each other of the two adjacent core laminations 11 together form reliable limiting of the radially inner end of the aforementioned tangential magnetic steel 2, see Figure 3 As shown, the radially inner side of the inner side magnet stop 112 and the radially inner side of the lamination body 111 together form the radially inner side of the core, the projection of the core lamination 11 on any radial plane of the rotor core 1 includes an inner side circular arc segment 1111 and an inner side straight line segment 1112 at both ends of the circumferential direction of the inner side circular arc segment 1111, the inner side straight line segment 1112 is perpendicular to the first central symmetry plane, it should be noted that the aforementioned inner side straight line segment 1112 is objectively a tangent corner structure at both ends of the circumferential direction of the radially inner side of the core, the radius of the inner side circular arc segment 1111 is R 内 (the center is on the side away from the radially outer side of the core), the pole number of the rotor core 1 is 2p, and the circumferential distance between the inner side magnet stops 112 of the two adjacent core laminations 11 is the pole opening width B 极口 , the distance between the inner side straight line segment 1112 and the center of the rotor core 1 is the tangent corner height h 切角 , It can be understood that when h 切角 < cos(π / 2p)*R 内 + sin(π / 2p)*B 极口 / 2, objectively the radially inner side of the core has no tangent corner structure, and when h 切角 >R 内 , the inner circular surface is completely tangent and the air gap is increased, which is not practical.

[0054] In this technical solution, by limiting the relationship between h 切角 , the radius of the aforementioned inner side circular arc segment 1111, the number of motor poles, and the pole opening width, the torque ripple of the corresponding motor can be significantly reduced.

[0055] In some embodiments, the length of the inner side straight line segment 1112 is L3, and the maximum distance between the inner side magnet stops 112 on both sides of the same core lamination 11 is B2, This can further reduce the torque pulsation during motor operation.

[0056] See Figure 7 As shown in the figure, it can be seen that the torque pulsation of the motor using the aforementioned angle cutting structure of the present invention is 1.89%, and the torque pulsation of the motor not using the aforementioned angle cutting structure of the present invention is 8.91%, that is, the torque pulsation is reduced by nearly 80% after the angle cutting.

[0057] In some embodiments, the radial outer end of the punch body 111 has an outer magnetic stopper 113 extending along the circumference of the rotor core 1 toward both sides of the core punch 11, and the radial outer side surface of the outer magnetic stopper 113 and the radial outer side surface of the punch body 111 jointly form the radial outer side surface of the core. It can be understood that since the radial inner side surface of the core and the radial outer side surface of the core are completely consistent in shape and size, the projection of the radial outer side surface of the core on the radial surface includes an outer arc segment 1113 and an outer straight line segment 1114 at both ends thereof, wherein the outer arc segment 1113 has the same shape and size as the inner arc segment 1111, and the outer straight line segment 1114 has the same shape and size as the inner straight line segment 1112, and the side of the outer magnetic stopper 113 facing the inner magnetic stopper 112 is a first plane (that is, Figure 4 The side of the inner magnet block 112 facing the outer magnet block 113 is a second plane (ie, the lower side of the outer magnet block 113 shown in FIG. Figure 4 The upper side surface of the inner magnetic stopper 112 shown in the figure), the first plane and the second plane on the same circumferential side surface of the punch body 111 are parallel, and the first plane is not perpendicular to the first central symmetry plane (that is, forming a certain angle), the magnetic steel slot 12 has a second central symmetry plane (not marked in the figure) in the diameter direction of the rotor core 1, and the first plane and the second plane corresponding to the magnetic steel slot 12 of any two adjacent core punches 11 are both perpendicular to the second central symmetry plane. It can be understood that the center of the aforementioned outer circular arc segment 1113 and the center of the inner circular arc segment 1111 are on the same diameter of the outer rotor core, and the spacing L1 between the two circles is equal to the radial length L2 of the punch body 111. The maximum spacing between the outer magnetic stoppers 113 on both sides of the same core punch 11 is B1, B1 = B2.

[0058] In this technical solution, the planes of the magnetic blocks on the radial inner and outer sides of the core punching sheet 11 are designed to be parallel to each other, and to form an angle setting (perpendicular or non-perpendicular) with the first central symmetry plane and the second central symmetry plane so that when the punching sheet is arranged, it can be arranged along the following lines: Figure 6The left and right directions of the shown orientation are arranged after inverting the adjacent core punching sheet 11 upside down by 180°, forming a parallelogram-shaped cut between them, ensuring the formation of the plane of the first plane and the second plane, and no sharp corners are left after punching, so as to be able to support the radial inner end and the radial outer end of the tangential magnetic steel 2, ensure the position reliability and stability of the tangential magnetic steel 2 during the operation of the motor, and at the same time, the punching difficulty can be reduced.

[0059] In some embodiments, the free end faces of the inner magnetic body block 112 and the outer magnetic body block 113 on the same circumferential side of the punching sheet body 111 are parallel to the first center symmetry plane when projected on the radial plane, that is, the free end faces of the inner magnetic body block 112 and the outer magnetic body block 113 are perpendicular to the first center symmetry plane. Figure 6 The shown orientation is taken as a reference, and the two core punching sheets 11 inverted by 180° on the left and right can be tightly fitted, and the material utilization rate of the silicon steel sheet can be further improved.

[0060] In another preferred embodiment, the radial width of the free end face of the inner magnetic body block 112 is B4, and the radial width of the free end face of the outer magnetic body block 113 is B3, B4=B3, and the thicknesses of the two magnetic body blocks that are tightly fitted with each other are equal, so that the shape of the silicon steel sheet area punched by the punch is more regular, the special requirements for the structure of the punch are reduced, and the punching cost is reduced.

[0061] It should be noted that the reliable limiting of the tangential magnetic steel 2 also improves the assembly accuracy of the rotor, thereby improving the balance of the rotor.

[0062] In some embodiments, the core punching sheet 11 has a positioning hole 132 penetrating through both side end faces thereof, and the positioning hole 132 can limit the circumferential rotation of the core punching sheet 11, as shown in Figure 3 As shown, the aforementioned positioning hole 132 can be a square hole, and correspondingly, in the process of manufacturing the rotor core, the accurate positioning of each core sub-block can be realized by a plurality of square columns arranged along the circumference in the corresponding positioning mold, that is, the stability of the circular state between each core sub-block is ensured, and then the plastic packaging treatment can be performed on each core sub-block in the circular state. Of course, before the specific plastic packaging, each tangential magnetic steel 2 should be assembled in the corresponding magnetic steel slot 12, so as to realize the integrated plastic packaging of the outer rotor core.

[0063] In order to further ensure the structural stability and reliability of the manufactured outer rotor core, prevent the separation between the plastic packaging material and the core sub-block, and each core punching sheet 11 has a plastic packaging connecting hole 131 penetrating through both side end faces thereof, and during the plastic packaging treatment, the plastic packaging material will have a part in the plastic packaging connecting hole 131, and a frame structure with a plurality of plastic packaging columns in the middle of the plastic packaging end plates at both ends is formed, and the structure is more stable.

[0064] With reference to Figure 8 and Figure 9 As shown in the drawings, in some embodiments, the outer rotor assembly further comprises a rotating shaft 3 and a connecting shell 8, the connecting shell 8 has a shaft hole 82 and a connecting leg 81 matched with the shaft end face of the rotor core 1, the rotating shaft 3 is connected with the connecting shell 8 through the shaft hole 82, and the connecting leg 81 is wrapped in the first plastic body 7 to realize the sealed connection between the connecting shell 8 and the rotor core 1, that is, the matching position between the connecting shell 8 and the shaft end face of each core body is completely sealed and wrapped by the first plastic body 7, and the connecting shell 8 can be made of a metal material with high anti-torsion ability.

[0065] In the technical scheme, the rotating torque of the rotating shaft 3 is reliably transmitted through the connecting shell 8 connected with the shaft end face of the rotor core 1, which can ensure the operation reliability of the motor, and the matching position between the connecting shell and the rotor core 1 is sealed by the first plastic body 7, so that the connecting structure of the rotor core 1 and the connecting shell 8 does not need to be separately arranged, the structure is further simplified, and the entry of external water dust into the motor is also improved.

[0066] In order to further improve the structural strength of the connecting shell 8 and improve the anti-torsion ability, the outer peripheral position of the shaft hole 82 forms a bending ring structure 83.

[0067] With reference to Figure 9 As shown in the drawings, the connecting leg 81 has a plurality of connecting legs 81, each of which is arranged one by one corresponding to each of the core bodies, that is, the plurality of connecting legs 81 are uniformly and spacedly arranged around the rotating shaft 3, the core punching sheet 11 has a plastic connection hole 131 penetrating through the two side end faces thereof, the core punching sheet 11 has a positioning hole 132 penetrating through the two side end faces thereof, the positioning hole 132 can limit the circumferential rotation of the core punching sheet 11, each of the connecting legs 81 has a first hole 811 corresponding to the plastic connection hole 131 and a second hole 812 corresponding to the positioning hole 132, that is, the first hole 811 and the second hole 812 are arranged on the connecting leg 81 in the direction perpendicular to the connecting leg 81. Figure 9 As shown in the drawings, the plastic connection hole 131 and the first hole 811 are one-to-one corresponding and vertically penetrating, and the positioning hole 132 and the second hole 812 are one-to-one corresponding and vertically penetrating.

[0068] In the technical scheme, when the outer rotor assembly is injection molded, the plastic will enter the plastic connection hole 131 and the first hole 811 to form a corresponding connecting part, which improves the connecting strength between the connecting shell 8 and the rotor core 1, and the free end (top end) of the positioning rod of the injection mold can enter the second hole 812 through the positioning hole 132 to form reliable positioning of the connecting shell 8.

[0069] According to the embodiments of the present application, with reference toFigures 8 to 14 Also provided is an outer rotor motor, comprising a stator assembly 4 and an outer rotor assembly sleeved on the radially outer side of the stator assembly 4, the outer rotor assembly being the above-mentioned outer rotor assembly, the stator assembly 4 comprising a stator assembly (not marked in the figure) and a second plastic wrapping body 41 wrapped on the radially outer side and axial both ends of the stator assembly, the stator assembly specifically comprising a stator core 421, an insulation framework 422 and a stator winding 423, and the second plastic wrapping body 41 specifically can adopt a BMC material (Bulk Molding Compound).

[0070] In the technical solution, the outer rotor assembly is wrapped on the outer side of the rotor core 1 by the tangential magnetic steel 2, and the stator assembly 4 is wrapped on the outer side of the stator assembly by the second plastic wrapping body 41, so as to realize the waterproof and dustproof design of the outer peripheral walls of the outer rotor assembly and the stator assembly, without the need to separately set a corresponding motor shell, thereby simplifying the motor structure, improving the protection level of the motor, preventing the circuit short circuit and burning caused by the external water, and improving the service life of the motor. It should be noted that for the motor configured with a PCB board, the PCB board is also wrapped in the second plastic wrapping body 41.

[0071] In some embodiments, the second plastic wrapping body 41 comprises a shell wrapping part (not marked in the figure) wrapped on the radially outer side of the stator assembly, the shell wrapping part being a shell structure of the stator assembly, wrapping the components of the stator assembly therein to realize waterproof and dustproof, specifically referring to Figure 8 As shown in the figure, a matching ring groove 411 is formed on the shell wrapping part, the slot opening of the matching ring groove 411 facing the outer rotor assembly, the outer peripheral wall part of the first plastic wrapping body 7 corresponding to the non-outside shaft end of the rotor core 1 being in the matching ring groove 411, further comprising a sealing rubber ring 5, the sealing rubber ring 5 being arranged between the outer peripheral wall of the first plastic wrapping body 7 and the radially outer groove vertical wall of the matching ring groove 411, the sealing rubber ring 5 being able to form a rotatable seal for the assembly matching ring gap of the outer rotor assembly and the stator assembly 4, effectively preventing the external water, dust and the like from entering the inside of the motor.

[0072] Referring to Figure 14As shown, the sealing rubber ring 5 comprises an inner ring wall 51 and an outer ring wall 52 which are arranged at intervals along the diameter of the rotor core 1, and the inner ring wall 51 and the outer ring wall 52 are connected by a sealing plate 53, the inner ring wall 51 is sleeved on the outer peripheral wall of the first plastic body 7, and the outer ring wall 52 and the radial outer side slot vertical wall of the matching ring groove 411 form a gap δ, 0.1mm≤δ≤0.5mm, that is, the outer ring wall 52 and the radial outer side slot vertical wall of the matching ring groove 411 form a gap seal, which can meet the rotation requirement of the outer rotor assembly while reducing the probability of external water, dust and the like entering the motor.

[0073] In another preferred embodiment, a positioning ring table 71 is arranged on the outer peripheral wall surface of the first plastic body 7 near the non-axle end surface of the rotor core 1, and an axial end of the sealing rubber ring 5 is in abutting connection with the positioning ring table 71. In this technical solution, the aforementioned positioning ring table 71 is integrally injection molded by plastic magnetic material, which can reliably position the axial position of the sealing rubber ring 5.

[0074] In some embodiments, the inner ring wall 51, the outer ring wall 52 and the sealing plate 53 form an opening of the sealing rubber ring 5, the opening of the sealing rubber ring 5 faces the axle end side of the rotor core 1, and the sealing rubber ring 5 forms a structure in a C shape. Since the sealing rubber ring 5 is made of elastic rubber and has deformation ability, when the outer rotor assembly rotates, the outer ring wall 52 will be deformed and extended along the diameter direction under the action of centrifugal force, which can further reduce the probability of external water, dust and the like entering the motor.

[0075] The second plastic body 41 is formed with motor mounting legs 412, that is, the motor mounting legs 412 are integrally injection molded with the second plastic body 41, which can further simplify the manufacturing process of the motor, and the aforementioned motor mounting legs 412 generally have three, and the three motor mounting legs 412 are uniformly and interval arranged around the shaft 3.

[0076] The stator assembly comprises a stator core 421, and the center of the tooth top arc surface of the stator tooth of the stator core 421 is located on the side of the center of the stator core 421 close to the stator tooth, so that the tooth top arc surface of the stator tooth is arranged eccentrically, and the tooth top arc surface and the inner side surface of the core form an air gap with unequal width, which improves the sine degree of air gap flux density and reduces the torque ripple of the motor.

[0077] In some embodiments, when the outer rotor motor is in use, the central axis of the rotating shaft 3 is in the horizontal plane, the radial outer slot vertical wall is a flared structure that expands towards the side close to the shaft end of the rotor core 1, and the single-side flared angle of the flared structure is a, 5° < a ≤ 30°, which can form an inclined plane that guides the external water towards the outside of the motor, preventing the external water from entering the inside of the motor; the horizontal distance between the outer end surface of the radial outer slot vertical wall and the outer end surface of the outer ring wall 52 is d, and the outer end surface of the radial outer slot vertical wall is closer to the shaft end surface of the rotor core 1, 1mm < d ≤ 10mm, so as to prevent water from flowing into the annular gap from the upper inclined plane when the motor is installed horizontally on the load, and improve the waterproof performance.

[0078] Further referring to Figure 14 As shown in some embodiments, the radial outer slot vertical wall includes a first water blocking inclined surface 4111 and a second water blocking inclined surface 4112, which are sequentially arranged along the axial direction of the rotating shaft 3 from the non-shaft end to the shaft end of the rotor core 1, the maximum inner diameter of the first water blocking inclined surface 4111 is smaller than the minimum inner diameter of the second water blocking inclined surface 4112, thereby forming a stepped structure that sequentially decreases from inside to outside of the matching ring groove 411, and the second water blocking inclined surface 4112 is arranged in position corresponding to the outer ring wall 52, which can make the water entering the inside of the motor flow outward under the action of gravity when the motor is installed horizontally.

[0079] In some embodiments, the second plastic covering body 41 includes a first end plate (not labeled in the figure) covering the end of the stator assembly away from the shaft end of the rotor core 1, and a first bearing chamber 413 is formed on the first end plate, and the second plastic covering body 41 includes a second end plate (not labeled in the figure) covering the end of the stator assembly close to the shaft end of the rotor core 1, and a second bearing chamber 414 is formed on the second end plate, and the rotating shaft 3 is rotatably supported in the first bearing chamber 413 through a first bearing 61 and rotatably supported in the second bearing chamber 414 through a second bearing 62. In this technical solution, the first bearing chamber 413 and the second bearing chamber 414 are integrally formed on the second plastic covering body 41, which can further simplify the structure of the motor.

[0080] Further referring to Figure 13As shown, the first bearing 61 is provided with a first retainer ring 33 (sleeved on the rotating shaft 3, which can be a snap ring) at one end away from the outer rotor assembly, which can position the first bearing 61 sleeved on the rotating shaft 3 in one axial side, the second bearing 62 is provided with a second retainer ring 34 (sleeved on the rotating shaft 3, which can be a snap ring) at one end away from the stator assembly 4, which can position the second bearing 62 sleeved on the rotating shaft 3 in the other axial side, a spring washer 32 is arranged at the other side of the second bearing 62 away from the second retainer ring 34, the spring washer 32 is clamped between the inner ring of the second bearing 62 and the chamber bottom wall of the second bearing chamber 414, the outer ring of the first bearing 61 is assembled in the first bearing chamber 413, and the outer ring of the second bearing 62 is assembled in the second bearing chamber 414, so that the axial positioning between the outer rotor assembly and the stator assembly 4 is realized through the rotating shaft 3.

[0081] In some embodiments, the stator assembly comprises a stator core 421, which is provided with a supporting ring surface (not labeled in the figure) on the end face away from the shaft end of the rotor core 1, the supporting ring surface is coaxially arranged with the first bearing chamber 413, and the width of the ring surface of the supporting ring surface is w, 3mm

[0082] According to the embodiments of the present application, a manufacturing method of the outer rotor assembly is also provided, which comprises the following steps:

[0083] The bottom end surface of each of the core segments and the cavity bottom wall of the mold cavity form a predetermined height, and the outer side surface of each of the core segments and the cavity vertical wall of the mold cavity form a predetermined interval. The predetermined height and the predetermined interval can be positioned and supported by square positioning columns arranged on the cavity bottom wall. The square positioning columns have positioning segments that can be inserted into the positioning holes 132 and the second holes 812, and supporting segments at the bottom end of the positioning segments. The cross sections of the positioning segments and the supporting segments are square, but the cross-sectional area of the supporting segments is larger than the hole area of the positioning holes 132 to ensure stable support of the core segments. After injection molding, a plurality of injection molding support positioning holes 72 are formed on the non-axis end surface of the rotor core 1, and a plurality of magnetic steel support holes 73 are formed on the non-axis end surface of the outer rotor assembly. In this step, each tangential magnetic steel 2 is placed according to the polarity division mark on the tangential magnetic steel 2 to ensure that the opposite poles of two adjacent tangential magnetic steels 2 are the same.

[0084] The connecting shell 8 is placed on the top surface of each of the core segments, and each connecting foot 81 of the connecting shell 8 corresponds to each of the core segments. Specifically, each connecting foot 81 of the connecting shell 8 corresponds to the top surface of each core segment, and the first hole 811 of each connecting foot 81 communicates with the plastic-coated connection hole 131 of the corresponding core segment, and the second hole 812 communicates with the positioning hole 132 of the corresponding core segment. The second hole 812 and the positioning hole 132 are sleeved on the positioning segment of the same positioning rod.

[0085] The mold cavity is injected with plastic to form the outer rotor assembly. It can be understood that during injection molding, the plastic will wrap around the radial outer wall and the two axial end walls of the rotor core 1 and the tangential magnetic steel 2, and part of the plastic will also enter the first hole 811 and the plastic-coated connection hole 131, thereby forming a plastic-coated outer rotor assembly.

[0086] After the plastic-coated outer rotor assembly is formed, the shaft 3 and the shaft hole 82 of the connecting shell 8 can be further connected by interference fit, thereby assembling an outer rotor assembly with a shaft 3.

[0087] Then, the second stop ring 34 is sleeved on the clamping groove of the shaft 3 near the shaft section, and the inner ring of the second bearing 62 is interference-fitted on the shaft 3 and axially limited by the second stop ring 34.

[0088] Afterwards, the sealing rubber ring 5 is sleeved on the outer circumferential wall of the first plastic body 7 and is axially limited by the positioning ring table 71, and the manufacturing of the outer rotor assembly is completed.

[0089] In the technical scheme, the connecting shell 8 is connected to the shaft outlet end surface of the rotor core 1 in an integral injection molding manner, without the need to set a connecting structure for the two, simplifying the assembly process of the rotor and improving the production efficiency.

[0090] More specifically, for the outer rotor motor of the application, the following steps are specifically adopted for assembly:

[0091] According to the manufacturing method of the outer rotor assembly described above, an independent outer rotor assembly is manufactured, and of course, the stator assembly 4 can also be simultaneously manufactured, and the assembly of the stator assembly is specifically as follows:

[0092] First, the insulating framework 422 (which can be a framework or a plastic encapsulation framework) is sleeved on the stator core 421, and then the stator winding 423 is wound to form the stator assembly; the stator assembly is fixed in the plastic encapsulation mold to form the plastic encapsulation of the stator assembly, and then the first bearing 61 is sleeved in the first bearing chamber 413, and the first bearing 61 is fixed in the first bearing chamber 413 by interference fit or adhesive bonding, thereby forming the stator assembly 4.

[0093] Then, the manufactured outer rotor assembly and the stator assembly 4 are assembled, first, the elastic pad 32 (specifically a spring wave pad) is placed on the chamber bottom wall of the second bearing chamber 414, the non-shaft outlet end of the shaft 3 is inserted into the center through hole of the stator core 421, and after the shaft 3 is inserted to the side of the first bearing 61 away from the outer rotor assembly, the first stop ring 33 is sleeved on the shaft 3 to form the final axial positioning of the shaft 3, thereby completing the assembly of the entire outer rotor motor.

[0094] Those skilled in the art will readily understand that the advantageous technical features of the above-mentioned methods can be freely combined and superimposed without conflict.

[0095] The above description is only the preferred embodiment of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application. The above description is only the preferred embodiment of the application, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the application, and these improvements and modifications shall be considered as within the protection scope of the application.

Claims

1. An outer rotor assembly, characterized in that: The invention comprises a rotor core (1), tangential magnetic steel (2) and a first plastic package (7), wherein the rotor core (1) comprises a plurality of core segments evenly spaced around the central axis thereof, and in a circular state, a magnetic steel slot (12) is formed between two adjacent core segments, and the magnetic steel slot (12) passes through the radial inner circular surface and the radial outer circular surface of the rotor core (1) from the inside to the outside along the radial direction of the rotor core (1), and each tangential magnetic steel (2) corresponds to each magnetic steel slot (12) one by one, and the first plastic package (7) at least wraps around the radial outer peripheral wall and the axial end wall of each core segment and each tangential magnetic steel (2); the core segment is formed by stacking a plurality of core punching sheets (11), and the radial inner side surface of the core of the core punching sheet (11) can match and match the radial outer side surface of the core, and each core punching sheet (11) has a radial inner side surface and an axial outer side surface of the core. The first central symmetric plane in the diameter direction of the sub-iron core (1), the iron core punching sheet (11) includes a punching sheet body (111), the radial inner end of the punching sheet body (111) has an inner magnetic block (112) extending along the circumference of the rotor iron core (1) to both sides of the iron core punching sheet (11), the radial inner side surface of the inner magnetic block (112) and the radial inner side surface of the punching sheet body (111) together form the radial inner side surface of the iron core, the iron core punching sheet (11) is projected on any radial surface of the rotor iron core (1), the projection of the radial inner side surface of the iron core includes an inner arc segment (1111) and inner straight line segments (1112) at both circumferential ends of the inner arc segment (1111), the inner straight line segment (1112) is perpendicular to the first central symmetric plane, and the radius of the inner arc segment (1111) is R 内 The number of poles of the rotor core (1) is 2p, and the circumferential spacing between the inner magnetic stoppers (112) respectively provided by two adjacent core punching sheets (11) is the pole opening width B. 极口 The distance between the inner straight line segment (1112) and the center of the rotor core (1) is the cutting angle height h 切角 , 2. The outer rotor assembly according to claim 1, characterized in that When each of the iron core punching sheets (11) is in an arrangement state, the radial inner side surface of the iron core and the radial outer side surface of the iron core punching sheet (11) are formed by punching and dividing by a cutting seam.

3. The outer rotor assembly according to claim 1, wherein: The length of the inner straight line segment (1112) is L3, the maximum distance between the inner magnetic stoppers (112) on both sides of the same core punching sheet (11) is B2, 4. The outer rotor assembly according to claim 3, characterized in that The radial outer end of the punch body (111) has an outer magnetic stopper (113) extending along the circumference of the rotor core (1) toward both sides of the core punch (11), and the radial outer side surface of the outer magnetic stopper (113) and the radial outer side surface of the punch body (111) together form the radial outer side surface of the core, the side surface of the outer magnetic stopper (113) facing the inner magnetic stopper (112) is a first plane, and the side surface of the inner magnetic stopper (112) facing the outer magnetic stopper (113) is a second plane, the first plane and the second plane on the same circumferential side surface of the punch body (111) are parallel, and the first plane is not perpendicular to the first central symmetry plane, the magnetic steel slot (12) has a second central symmetry plane in the diameter direction of the rotor core (1), and the first plane and the second plane corresponding to the magnetic steel slot (12) of any two adjacent core punches (11) are both perpendicular to the second central symmetry plane.

5. The outer rotor assembly according to claim 2, characterized in that The invention also includes a rotating shaft (3) and a connecting shell (8), wherein the connecting shell (8) has an axial hole (82) and a connecting foot (81) that cooperates with the end face of the shaft outlet of the rotor core (1), and the rotating shaft (3) is connected to the connecting shell (8) through the axial hole (82). The connecting foot (81) is wrapped in the first plastic package (7) to achieve a sealed connection between the connecting shell (8) and the rotor core (1).

6. The outer rotor assembly according to claim 5, characterized in that There are a plurality of connecting pins (81), and each connecting pin (81) is arranged in a one-to-one correspondence with each iron core body. The iron core punch (11) has a plastic-coated connecting hole (131) passing through the end faces on both sides thereof, and the iron core punch (11) has a positioning hole (132) passing through the end faces on both sides thereof. The positioning hole (132) can limit the circumferential rotation of the iron core punch (11), and each connecting pin (81) has a first hole (811) corresponding to the plastic-coated connecting hole (131) and a second hole (812) corresponding to the positioning hole (132).

7. An outer rotor motor, comprising a stator assembly (4) and an outer rotor assembly mounted radially outside the stator assembly (4), characterized in that: The outer rotor assembly is the outer rotor assembly according to any one of claims 1 to 6, and the stator assembly (4) includes a stator assembly and a second plastic package (41) wrapped around the radial outer side and axial ends of the stator assembly.

8. The outer rotor motor according to claim 7, characterized in that The second plastic-encapsulated body (41) includes a shell encapsulated portion encapsulated on the radial outer side of the stator assembly, a matching ring groove (411) is formed on the shell encapsulated portion, the notch of the matching ring groove (411) faces the outer rotor assembly, the outer peripheral wall portion of the first plastic-encapsulated body (7) corresponding to the non-axial end of the rotor core (1) is located in the matching ring groove (411), and also includes a sealing rubber ring (5), the sealing rubber ring (5) is arranged between the outer peripheral wall of the first plastic-encapsulated body (7) and the radial outer side groove wall of the matching ring groove (411); and / or, the second plastic-encapsulated body (41) is formed with a motor mounting foot (412); and / or, the stator assembly includes a stator core (421), the center of the tooth top arc surface of the stator teeth of the stator core (421) is located on the side of the center of the stator core (421) close to the stator teeth.

9. The outer rotor motor according to claim 8, characterized in that The sealing rubber ring (5) comprises an inner ring wall (51) and an outer ring wall (52) arranged at intervals along the diameter of the rotor core (1), the inner ring wall (51) and the outer ring wall (52) being connected via a sealing plate (53), the inner ring wall (51) being sleeved on the outer peripheral wall of the first plastic package (7), and a gap δ is formed between the outer ring wall (52) and the radially outer groove wall of the matching ring groove (411), 0.1mm≤δ≤0.5mm; and / or, a positioning ring platform (71) is provided on the outer peripheral wall surface of the first plastic package (7) at a position close to the non-axial end surface of the rotor core (1), and one axial end of the sealing rubber ring (5) is abutted against the positioning ring platform (71).

10. The outer rotor motor according to claim 9, characterized in that The inner ring wall (51), the outer ring wall (52) and the sealing plate (53) form a sealing rubber ring (5) with an opening, and the opening of the sealing rubber ring (5) faces the shaft end side of the rotor core (1).

11. The outer rotor motor according to claim 9, characterized in that When the outer rotor motor is in use, the central axis of the rotating shaft (3) is on a horizontal plane, the radial outer groove wall is a flaring structure that gradually expands toward the shaft end close to the rotor core (1), and the unilateral flaring angle of the flaring structure is α, 5°<α≤30°; and / or the horizontal spacing between the outer end surface of the radial outer groove wall and the outer end surface of the outer ring wall (52) is d, 1mm<d≤10mm.

12. The outer rotor motor according to claim 11, characterized in that The radial outer groove wall comprises a first water retaining slope (4111) and a second water retaining slope (4112). The first water retaining slope (4111) and the second water retaining slope (4112) are arranged in sequence along the axial direction of the rotating shaft (3) from the non-exiting end to the exiting end of the rotor core (1). The maximum inner diameter of the first water retaining slope (4111) is smaller than the minimum inner diameter of the second water retaining slope (4112), and the second water retaining slope (4112) is arranged corresponding to the position of the outer ring wall (52).

13. The outer rotor motor according to claim 7, characterized in that The second plastic-encased body (41) includes a first end plate covering an end of the stator assembly away from the shaft end of the rotor core (1), and a first bearing chamber (413) is formed on the first end plate. The second plastic-encased body (41) includes a second end plate covering an end of the stator assembly close to the shaft end of the rotor core (1), and a second bearing chamber (414) is formed on the second end plate. The rotating shaft (3) is rotatably supported in the first bearing chamber (413) through a first bearing (61) and is rotatably supported in the second bearing chamber (414) through a second bearing (62).

14. The outer rotor motor according to claim 13, characterized in that The stator assembly comprises a stator core (421), and a support annular surface is formed on the end surface of the stator core (421) away from the shaft end of the rotor core (1). The support annular surface is coaxially arranged with the first bearing chamber (413), and the annular surface width of the support annular surface is w, 3mm<w.

15. A method for manufacturing an outer rotor assembly according to any one of claims 1 to 6, characterized in that: The steps include: Placing each of the core segments at a preset position in the mold cavity of the injection mold to form a circle, ensuring that a preset height is formed between the bottom end surface of each core segment and the bottom wall of the mold cavity, and ensuring that a preset gap is formed between the outer side surface of each core segment and the vertical wall of the mold cavity; Placing a connection shell (8) on the top surface of each of the iron core segments so that each connection foot (81) of the connection shell (8) corresponds to each of the iron core segments; Injecting plastic into the mold cavity to mold the outer rotor assembly.

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