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, wherein the outer rotor assembly comprises a rotor core and plastic magnetic material wrapping bodies; the rotor core comprises a plurality of core parts which are uniformly and spacedly arranged around a central axis, and in a circular state, two adjacent core parts form a magnetic steel slot; each plastic magnetic material wrapping body has a tangential magnetic steel part in the magnetic steel slot, a plastic wrapping connecting part wrapping a radial outer wall and an axial end wall of the core part, and the plastic magnetic material wrapping body is formed by integral injection molding of plastic magnetic material. The application does not need to embed the tangential magnetic steel in the magnetic steel slot between the core parts in the circular state in advance when manufacturing the outer rotor assembly, thus it is not necessary to manufacture a mold to set corresponding positioning and supporting structures for the tangential magnetic steel, the mold structure design is simplified, the manufacturing steps are simplified, and the manufacturing cost of the outer rotor core can be significantly reduced.

Description

TECHNICAL FIELD

[0001] The 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 larger output torque, and the motor length can be reduced and the weight is lighter. In addition, the high rotational inertia of the outer rotor structure effectively reduces torque fluctuation and vibration noise, and the outer rotor motor is 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 the 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 stator magnetic field to generate torque. The utilization rate of the permanent magnet material is low. Moreover, 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 In order to overcome the aforementioned deficiencies of the prior art, a motor with an outer rotor tangential magnetization magnetic steel is proposed in the related art. The rotor core and the tangential magnetic steel need to be positioned during the manufacturing process of the rotor assembly, resulting in complex manufacturing molds and manufacturing steps, and increasing the manufacturing cost. SUMMARY

[0004] Therefore, the application provides an outer rotor assembly, an outer rotor motor and a manufacturing method, which can solve the technical problem that the motor with an outer rotor tangential magnetization magnetic steel in the prior art needs to position the rotor core and the tangential magnetic steel during the manufacturing process of the rotor assembly, resulting in complex manufacturing structure and increasing the manufacturing cost.

[0005] In order to solve the above problems, the application provides an outer rotor assembly, which comprises a rotor core and a plastic magnetic material wrapping body. The rotor core comprises a plurality of core parts uniformly spaced around the central axis. In the circular state, a magnetic steel slot is formed between two adjacent core parts. Each plastic magnetic material wrapping body has a tangential magnetic steel part in the magnetic steel slot, a plastic wrapping connection part wrapped around the radial outer wall and the axial end wall of the core part, and the plastic magnetic material wrapping body is formed by integral injection molding of plastic magnetic material.

[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. In the layout state of the iron core punch, the iron core radial inner side surface and the iron core radial outer side surface are formed by cutting and separating a cutting seam.

[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 pairs, 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, and 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 iron core punch has a plastic-coated connecting hole penetrating both end surfaces thereof, and / or the iron core punch has a positioning hole penetrating both end surfaces thereof. The positioning hole can limit the circumferential rotation of the iron core punch.

[0011] In some embodiments, the radial inner ends of two adjacent core segments form pole openings in communication with the magnetic steel slots, the plastic magnetic material wrapping body has a plurality of accommodation grooves on the radially inner side of the tangential magnetic steel portion, each of the accommodation grooves corresponds to a position of each of the pole openings to prevent the plastic magnetic material from filling in the pole openings, and each of the accommodation grooves extends from the non-outside-end end face to the outside-end end face of the rotor core and penetrates through to the outside-end end face.

[0012] In some embodiments, the outer rotor assembly further comprises a rotating shaft, and the plastic wrapping connection portion comprises a rotating shaft connection portion on the outside-end end face of the rotor core, which is integrally injection-molded on the outer circumferential wall of the rotating shaft.

[0013] In some embodiments, the outer circumferential wall of the rotating shaft is provided with at least two grooves, each of the grooves is arranged at intervals around the axis of the rotating shaft, and the rotating shaft connection portion has a portion in each of the grooves.

[0014] The application further 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 above-mentioned outer rotor assembly, and the stator assembly comprises a stator assembly and a plastic wrapping body wrapped on the radially outer side and both axial ends of the stator assembly.

[0015] In some embodiments, the plastic wrapping body comprises a shell wrapping portion wrapped on the radially outer side of the stator assembly, the shell wrapping portion is provided with a matching ring groove, the groove opening of the matching ring groove faces the outer rotor assembly, the plastic wrapping connection portion comprises a shell portion on the radially outer circumferential wall of the rotor core, the shell portion is in the matching ring groove corresponding to the non-outside-end portion, and further comprises a sealing rubber ring arranged between the radially outer side groove vertical wall of the shell portion and the matching ring groove; and / or, the plastic wrapping body is provided with a motor mounting leg; and / or, the stator assembly comprises a stator core, and the center of the tooth top arc surface of the stator tooth of the stator core is located on the side of the stator core close to the stator tooth.

[0016] In some embodiments, the plastic wrapping connection portion comprises a shell portion on the radially outer circumferential wall of the rotor core, the shell portion is in the matching ring groove corresponding to the non-outside-end portion, and further comprises a sealing rubber ring arranged between the radially outer side groove vertical wall of the shell portion and the matching ring groove.

[0017] In some embodiments, the sealing 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 by a sealing plate, the inner ring wall is sleeved on the shell part, the outer ring wall and the radially outer side groove vertical wall of the matching ring groove form a gap δ, 0.1mm≤δ≤0.5mm; and / or, the outer wall surface of the shell part is provided with a positioning ring table near the non-outside end surface of the rotor core, and the axial one end of the sealing ring is in abutting connection with the positioning ring table.

[0018] In some embodiments, the inner ring wall, the outer ring wall and the sealing plate form an opening sealing ring, and the opening of the sealing ring is directed to the outside end side of the rotor core.

[0019] In some embodiments, when the outer rotor motor is in use, the central axis of the rotating shaft is in the horizontal plane, the radially outer side groove vertical wall is a flared structure that is gradually expanded towards the outside end side of the rotor core, and the one-side flaring angle of the flared structure is α, 5°<α≤30°; and / or, the horizontal distance between the outer end surface of the radially outer side groove vertical wall and the outer end surface of the outer ring wall is d, 1mm<d≤10mm.

[0020] In some embodiments, the radially outer side groove vertical wall comprises a first water retaining inclined surface and a second water retaining inclined surface, the first water retaining inclined surface and the second water retaining inclined surface are sequentially arranged along the axial direction of the rotating shaft from the non-outside end of the rotor core to the outside end, the maximum inner diameter of the first water retaining inclined surface is smaller than the minimum inner diameter of the second water retaining inclined surface, and the second water retaining inclined surface is arranged in position corresponding to the outer ring wall.

[0021] In some embodiments, the plastic-coated body comprises a first end plate covering the end of the stator assembly away from the outside end of the rotor core, and the first end plate is provided with a first bearing chamber; the plastic-coated body comprises a second end plate covering the end of the stator assembly close to the outside end of the rotor core, and the second end plate is provided 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.

[0022] In some embodiments, the stator assembly comprises a stator core, and the end surface of the stator core away from the outside end of the rotor core is provided with a supporting ring surface, the supporting ring surface is coaxially arranged with the first bearing chamber, and the width of the ring surface of the supporting ring surface is w, 3mm<w.

[0023] The application also provides a manufacturing method of the outer rotor assembly as described above, comprising the following steps:

[0024] The iron core sub-bodies are respectively placed in preset positions in the mold cavity of the injection mold to form a circular state, and the bottom end surface of each iron core sub-body and the cavity bottom wall of the mold cavity form a preset height, and the outer side surface of each iron core sub-body and the mold cavity vertical wall form a preset interval;

[0025] The rotating shaft is placed in the central through hole formed by each iron core sub-body in the circular state;

[0026] The plastic magnetic material is injected into the mold cavity to form the outer rotor assembly.

[0027] The outer rotor assembly, the outer rotor motor and the manufacturing method provided by the application have the following beneficial effects:

[0028] The plastic magnetic material is used to integrally injection mold the magnetic steel of the outer rotor assembly and wrap and connect each sub-type rotor iron core into a whole. After injection molding, only the tangential magnetic steel part needs to be magnetized in the tangential direction to realize the manufacturing of the outer rotor assembly with the tangential magnetic steel. The tangential magnetic steel does not need to be embedded in the magnetic steel groove between the iron core sub-bodies in the circular state in advance when the outer rotor assembly is manufactured. Therefore, the corresponding positioning and supporting structure for the tangential magnetic steel does not need to be provided in the mold, which simplifies the mold structure design and the manufacturing steps, and can significantly reduce the manufacturing cost of the outer rotor iron core. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the 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 those skilled in the art can also obtain other implementation drawings according to the provided drawings without creative labor.

[0030] Figure 1 is a schematic diagram of the internal structure of the outer rotor motor in the prior art;

[0031] Figure 2 is a schematic diagram of the punching layout of the sub-block type inner rotor iron core in the prior art;

[0032] Figure 3 is a schematic diagram of the structure of the rotor iron core in the circular state (radial surface projection view, including the stator iron core) of the embodiment of the application, and the arrow in the figure shows the direction of the magnetic force line;

[0033] Figure 4 is a schematic diagram of the structure of the rotor iron core in the circular state (radial surface projection view, not including the stator iron core) of the embodiment of the application

[0034] Figure 5 is Figure 4 a schematic diagram of the structure of the iron core sub-body in

[0035] Figure 6 is a core split lamination layout diagram in the present application (i.e. in a layout state);

[0036] Figure 7 is a torque fluctuation (i.e. torque ripple) comparison diagram of a motor using the corner cutting structure of the present application and a motor not using the corner cutting structure of the present application;

[0037] Figure 8 is a structure exploded view (partly cutaway) of an outer rotor motor of another embodiment of the present application;

[0038] Figure 9 is a perspective structure diagram (partly cutaway) of an outer rotor assembly in the Figure 8 at an angle;

[0039] Figure 10 is a perspective structure diagram (partly cutaway) of an outer rotor assembly in the Figure 8 at another angle;

[0040] Figure 11 is a perspective structure diagram (partly cutaway) of a stator assembly in the Figure 8 at an angle;

[0041] Figure 12 is a perspective structure diagram (partly cutaway) of a stator assembly in the Figure 8 at another angle;

[0042] Figure 13 is an internal structure diagram of an outer rotor motor of an embodiment of the present application;

[0043] Figure 14 is a partial enlarged view of A in the Figure 13

[0044] Reference signs are:

[0045] ​1, rotor core; 11, core punching sheet; 111, punching sheet body; 1111, inner side circular arc segment; 1112, inner side straight line segment; 1113, outer side circular arc segment; 1114, outer side straight line segment; 112, inner side magnet stop block; 113, outer side magnet stop block; 12, magnetic steel slot; 131, plastic wrapping connecting hole; 132, positioning hole; 2, plastic magnetic material wrapping body; 21, tangential magnetic steel part; 211, let-position groove; 22, plastic wrapping connecting part; 221, rotating shaft connecting part; 222, shell part; 2221, positioning ring table; 223, injection molding support positioning hole; 3, rotating shaft; 31, groove; 32, elastic pad; 33, first stop ring; 34, second stop ring; 4, stator assembly; 41, plastic wrapping body; 411, matching ring groove; 4111, first water retaining slope; 4112, second water retaining slope; 412, motor mounting support leg; 413, first bearing chamber; 414, second bearing chamber; 421, stator core; 422, insulation framework; 423, stator winding; 5, sealing rubber ring; 51, inner ring wall; 52, outer ring wall; 53, sealing plate; 61, first bearing; 62, second bearing. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0047] 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 indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular 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.

[0048] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "above" or "below" other elements or features would then be oriented "below" or "above" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90° or at other orientations) and the spatial relative descriptors used herein interpreted accordingly.

[0049] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any meaning of importance, but are used only to distinguish one element from another, and are used subject to change only the context. Consequently, the use of such terms is not intended to limit the scope of the present application to the specific embodiments presented herein. Nor, therefore, should they be taken to imply that the application and the claims are limited to only those embodiments.

[0050] With reference to the drawings Figures 1 to 14 As shown, according to the embodiment of the present application, an outer rotor assembly is provided, comprising a rotor core 1 and plastic magnetic material wrapping bodies 2, the rotor core 1 comprises a plurality of core parts (not labeled in the figure) uniformly spaced around the central axis (not labeled in the figure) of the rotor core 1, in the circular state (i.e. the state of the core parts forming the rotor core 1), a magnetic steel slot 12 is formed between two adjacent core parts, each plastic magnetic material wrapping body 2 has a tangential magnetic steel part 21 in the magnetic steel slot 12, a plastic wrapping connecting part 22 wrapping the radial outer wall and the axial end wall of the core part, the plastic magnetic material wrapping body 2 is formed by integrally injection molding of plastic magnetic material, it can be understood that both the tangential magnetic steel part 21 and the plastic wrapping connecting part 22 are formed by integrally injection molding of plastic magnetic material, but the difference is that the tangential magnetic steel part 21 needs to be tangentially magnetized after injection molding, while the plastic wrapping connecting part 22 does not need to be magnetized, that is, the function of the plastic wrapping connecting part 22 is to wrap and connect each core part into a whole, in addition, referring to Figure 3 As shown, after the tangential magnetic steel part 21 is tangentially magnetized, the magnetic poles of the opposite sides of two adjacent tangential magnetic steel parts 21 are the same, that is, the polarities of the opposite sides of two adjacent tangential magnetic steel parts 21 are opposite, for details, see Figure 3 As shown, the magnetization direction of each tangential magnetic steel part 21 is along the tangential direction of the rotor, and the polarities of the circumferential sides of two adjacent tangential magnetic steel parts 21 are one of N-pole and S-pole, the rotor core has positive and negative alternating polarities in the circumferential direction, and the interaction with the stator core 421 generates torque.

[0051] In the technical solution, the plastic magnetic material is used to integrally injection mold the magnetic steel of the outer rotor assembly and wrap and connect each split rotor core 1 into a whole, and only the tangential magnetization of the tangential magnetic steel part 21 is needed after the injection molding is completed to realize the manufacturing of the outer rotor assembly with the tangential magnetic steel, and the tangential magnetic steel does not need to be embedded in the magnetic steel groove 12 between the split cores in the circular state in advance when the outer rotor assembly is manufactured, so that the corresponding positioning and supporting structure for the tangential magnetic steel does not need to be provided in the mold, the mold structure design is simplified, the manufacturing steps are simplified, the manufacturing cost of the outer rotor core can be significantly reduced, the outer rotor core in the application is formed by circular assembly of a plurality of separated core splits, there is no magnetic bridge connection between the two adjacent core splits, and there is basically no magnetic leakage path, so that the magnetic leakage of the motor is greatly reduced, the performance of the motor is improved, the positive and negative poles (N pole and S pole) of the tangential magnetic steel part 21 can be utilized, the utilization rate of the permanent magnet material of the outer rotor motor can be significantly improved, the power density of the motor is improved, the copper wire consumption is reduced, and the cost of the motor is reduced. In addition, the structure of the outer rotor assembly of the application is simpler and has high production efficiency.

[0052] 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 the back electromotive force does not increase when the thickness of the magnetic ring increases to a certain thickness, the utilization rate of the embedded tangential permanent magnet (i.e. the tangential magnetic steel part 21) of the outer rotor of the application is high, the air gap magnetic density is larger, and the radial lengthening of the permanent magnet can effectively increase the air gap magnetic density and improve the power density of the outer rotor motor.

[0053] In some embodiments, the core split is formed by stacking a plurality of core punches 11, and 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 punch 11 can match and fit, and the core radial inner side surface and the core radial outer side surface of the core punch 11 are formed by a cutting seam when the core punch 11 is in a layout state. 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 punch 11 are the same, and since each core split is formed by stacking the same core punch 11, the shape of each core split is the same as the shape and size of each core punch 11 when projected on the radial surface of the rotor core 1.

[0054] The core punch 11 is matched with the shape and size of the inner side and the outer side of the core, so that the core punch 11 can be closely arranged along the length direction of the core punch 11 when the core punch 11 is arranged and punched. That is, the inner side of one core punch 11 and the outer side of the adjacent core punch 11 can be formed by a punch gap, that is, the structure of the core punch 11 in the application realizes the close arrangement of the side surfaces of at least two adjacent core punches 11 in one direction, and there is no waste in this area during the punching process. Therefore, the material utilization rate of the silicon steel sheet can be greatly improved, and the waste rate is reduced. In addition, it should be noted that the outer rotor core of the present application is a block structure, and there is no magnetic bridge connection between the two adjacent core blocks. There is basically no magnetic leakage path, which greatly reduces the magnetic leakage of the motor and improves the performance of the motor.

[0055] Specifically referring to Figure 6 as shown, with Figure 6 Referring to the orientation shown, the inner side of the core punch 11 above directly abuts the outer side of the core punch 11 below 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 contrast, referring to the traditional block type inner rotor core punch arrangement shown in Figure 2 It can be seen that there are many edge regions, which will objectively form waste.

[0056] In a preferred embodiment, in some embodiments, each of the core punches 11 has a first center of symmetry in the diameter direction of the rotor core 1 (not labeled in the figure), that is, the core punch 11 is symmetric about the first center of symmetry. The core punch 11 includes a punch body 111, and the radially inner end of the punch body 111 has an inner side magnet stop 112 extending to both sides of the core punch 11 along the circumferential direction of the rotor core 1. Specifically, the aforementioned inner side magnet stop 112 and the punch body 111 are integrally punched, and the radially outer sides of the two inner side magnet stops 112 of the adjacent two core punches 11 form reliable limiting for the radially inner end of the aforementioned tangential magnetic steel portion 21. Specifically referring to Figure 3As shown, the radially inner side of the inner magnet block 112 and the radially inner side of the punch body 111 jointly form the core radially inner side, the projection of the core punch 11 on any radial plane of the rotor core 1, the projection of the core radially inner side includes an inner arc segment 1111 and inner straight segments 1112 at the circumferential two ends of the inner arc segment 1111, the inner straight segments 1112 are perpendicular to the first central symmetry plane, it should be noted that the aforementioned inner straight segments 1112 are objectively the tangent angle structure at the circumferential two ends of the core radially inner side, the radius of the inner arc segment 1111 is R 内 (the center of the circle is on the side away from the core radially outer side), the pole number of the rotor core 1 is 2p, the circumferential spacing between the inner magnet blocks 112 of the adjacent two core punches 11 is the pole opening width B 极口 , the distance between the inner straight segments 1112 and the center of the rotor core 1 is the tangent angle 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, the aforementioned core radially inner side objectively has no tangent angle structure, and h 切角 >R 内 , that is, the inner circular surface is completely tangent and the air gap is increased, which is not practical.

[0057] In the technical solution, by limiting the relationship between h 切角 , the radius of the aforementioned inner arc segment 1111, the motor pole number and the pole opening width, the torque ripple of the corresponding motor can be significantly reduced.

[0058] In some embodiments, the length of the inner straight segment 1112 is L3, the maximum spacing between the inner magnet blocks 112 on both sides of the same core punch 11 is B2, so as to further reduce the torque ripple during motor operation.

[0059] Specifically referring to Figure 7 As shown in the figure, the torque ripple of the motor using the aforementioned tangent angle structure of the application is 1.89%, and the torque ripple of the motor without using the aforementioned tangent angle structure of the application is 8.91%, that is, the torque ripple is reduced by nearly 80% after the tangent angle.

[0060] 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.

[0061] 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 6 In the left and right directions of the orientation shown, the adjacent core punching sheets 11 are turned upside down 180° and then arranged left and right, forming a parallelogram-shaped cut between the two to ensure the plane formation of the aforementioned first plane and the second plane. No sharp corners remain after punching, so that the radial inner end and the radial outer end of the tangential magnetic steel part 21 can be supported on the plane, ensuring the position reliability and stability of the tangential magnetic steel part 21 during the operation of the motor, and at the same time reducing the difficulty of punching.

[0062] In some embodiments, when projected on the radial surface, the free end surfaces of the inner magnetic stopper 112 and the outer magnetic stopper 113 on the same circumferential side surface of the punch body 111 are parallel to the first central symmetry plane, that is, Figure 6 The orientation shown is for reference only. The two left and right core punching sheets 11 that are reversed by 180 degrees can form a close contact, which can further improve the material utilization rate of the silicon steel sheet.

[0063] In another preferred embodiment, the radial width of the free end face of the inner magnetic stopper 112 is B4, and the radial width of the free end face of the outer magnetic stopper 113 is B3, B4=B3, and the thickness of the two magnetic stops closely attached to each other is equal, so that the shape of the silicon steel sheet area punched out by the punch is more regular, which can reduce the special requirements for the punch structure and reduce the punching cost.

[0064] It should be noted that the reliable limiting of the tangential magnetic steel portion 21 also improves the assembly accuracy of the rotor, thereby improving the balance of the rotor.

[0065] In some embodiments, the core punching sheet 11 has a positioning hole 132 that passes through both end surfaces thereof. The positioning hole 132 can limit the circumferential rotation of the core punching sheet 11. For details, see Figure 3 As shown, the aforementioned positioning hole 132 can be a square hole. Correspondingly, in the process of manufacturing the rotor core, the formation position of each core block can be accurately determined by a plurality of circumferentially arranged square columns in the corresponding positioning mold, that is, the stability of the circular state between each core block is ensured, and then the core blocks in the circular state can be plastic-coated. Of course, before the specific plastic-coating, each tangential magnetic steel portion 21 should be respectively assembled in the corresponding magnetic steel slot 12, so as to realize the integrated plastic-coating of the outer rotor core.

[0066] In order to further ensure the structural stability and reliability of the manufactured outer rotor core and prevent peeling between the plastic coating and the core body, each of the core punching sheets 11 has a plastic coating connection hole 131 that passes through the end faces on both sides thereof. During the plastic coating process, the plastic coating will have a portion located within the plastic coating connection hole 131, specifically forming a frame structure with plastic coating end plates at both ends and multiple plastic coating columns in the middle, making the structure more stable.

[0067] See Figure 10 As shown, in some embodiments, a pole port (ie, a pole port) communicating with the magnetic steel slot 12 is formed between the radial inner ends of two adjacent core segments. Figure 4 Middle B 极口As shown in the figures, in some embodiments, the outer rotor assembly further comprises a rotating shaft 3, and the plastic-wrapped connecting portion 22 comprises a rotating shaft connecting portion 221 on the out-of-axis end face of the rotor core 1, which is integrally injection molded on the outer circumferential wall of the rotating shaft 3, that is, in this technical solution, the rotating shaft 3, the rotor core 1 and the plastic magnetic material wrapped body 2 are integrally injection molded, which can further simplify the manufacturing process of the outer rotor assembly.

[0068] Specifically referring to Figure 8 As shown in the figures, in some embodiments, the outer rotor assembly further comprises a rotating shaft 3, and the plastic-wrapped connecting portion 22 comprises a rotating shaft connecting portion 221 on the out-of-axis end face of the rotor core 1, which is integrally injection molded on the outer circumferential wall of the rotating shaft 3, that is, in this technical solution, the rotating shaft 3, the rotor core 1 and the plastic magnetic material wrapped body 2 are integrally injection molded, which can further simplify the manufacturing process of the outer rotor assembly.

[0069] The plastic-wrapped connecting portion 22 comprises a shell portion 222 on the radial outer circumferential wall of the rotor core 1, so that after the outer rotor assembly is manufactured, the outer circumferential wall of the plastic magnetic material wrapped body 2 objectively forms the shell of the corresponding motor, without the need to separately provide a motor shell to accommodate the outer rotor assembly, further simplifying the manufacturing process of the corresponding motor, reducing manufacturing costs, and at the same time, as mentioned above, since the rotating shaft 3 and the plastic magnetic material wrapped body 2 are integrally injection molded, there is no need to consider the in-axis assembly of the rotating shaft 3 and the motor shell.

[0070] Specifically referring to Figure 9 As shown in the figures, in some embodiments, the outer circumferential wall of the rotating shaft 3 is formed with at least two grooves 31 (the specific number can be determined according to the output torque of the motor and the diameter of the rotating shaft 3), each of the grooves 31 is arranged at intervals around the axis of the rotating shaft 3, and the rotating shaft connecting portion 221 has a portion in each of the grooves 31, which objectively forms a key body. In this technical solution, after the plastic magnetic material is injection molded, part of it is embedded in the groove 31, which can ensure reliable output of the torque of the rotating shaft 3.

[0071] According to the embodiments of the present application, referring to Figures 8 to 14, also provides an outer rotor motor, including a stator assembly 4 and an outer rotor assembly mounted on the radial outer side of the stator assembly 4, the outer rotor assembly is the above-mentioned outer rotor assembly, the stator assembly 4 includes a stator assembly (not labeled in the figure) and a plastic body 41 wrapped around the radial outer side and axial ends of the stator assembly, the aforementioned stator assembly specifically includes a stator core 421, an insulating frame 422 and a stator winding 423, and the aforementioned plastic body 41 can specifically be made of BMC material (Bulk Molding Compound).

[0072] In this technical solution, the outer rotor assembly is encased in a plastic magnetic material encapsulation 2 around the outer side of the rotor core 1, and the stator assembly 4 is encased in a plastic overmolding 41 around the outer side of the stator assembly. This ensures a waterproof and dustproof design for the outer peripheral walls of both the outer rotor assembly and the stator assembly. This eliminates the need for a separate motor housing, simplifies the motor structure, and improves the motor's protection level, preventing short circuits and burns caused by external water ingress, thereby extending the motor's service life. It should be noted that for motors equipped with a PCB, the PCB is also encapsulated within the plastic overmolding 41.

[0073] Specifically, the plastic package 41 includes a shell wrapping portion (not labeled in the figure) wrapped around the radial outer side of the stator assembly. The shell wrapping portion also forms the shell structure of the stator assembly, wrapping the various components of the stator assembly therein to achieve waterproof and dustproof. For details, see Figure 8 As shown, a mating ring groove 411 is formed on the shell wrapping portion, and the notch of the mating ring groove 411 faces the outer rotor assembly. The plastic-coated connection portion 22 includes a shell portion 222 located on the radial outer peripheral wall of the rotor core 1, and the shell portion 222 and the corresponding portion of the non-shaft end are located in the mating ring groove 411. It also includes a sealing rubber ring 5, which is arranged between the shell portion 222 and the radial outer groove wall of the mating ring groove 411. The sealing rubber ring 5 can form a rotatable seal on the assembly mating gap between the outer rotor assembly and the stator assembly 4, effectively preventing external water, dust, etc. from entering the interior of the motor.

[0074] See also Figure 14 As shown, the sealing rubber ring 5 includes 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 are connected by a sealing plate 53. The inner ring wall 51 is mounted on the outer shell portion 222. A gap δ is formed between the outer ring wall 52 and the radially outer groove wall of the matching annular groove 411, and 0.1mm≤δ≤0.5mm is formed. That is, a gap seal is formed between the outer ring wall 52 and the radially outer groove wall of the matching annular groove 411, which can meet the rotation requirements of the outer rotor assembly while reducing the probability of external water, dust, etc. entering the interior of the motor.

[0075] In another preferred embodiment, the outer wall surface of the housing portion 222 is provided with a positioning ring platform 2221 near the non-outside end surface of the rotor core 1, and the axial end of the sealing rubber ring 5 is in abutting connection with the positioning ring platform 2221. In this technical solution, the aforementioned positioning ring platform 2221 is integrally injection molded with plastic magnetic material, which can reliably position the axial position of the sealing rubber ring 5.

[0076] In some embodiments, the inner ring wall 51, the outer ring wall 52, and the sealing plate 53 form an open sealing rubber ring 5, the opening of the sealing rubber ring 5 faces the outside end surface of the rotor core 1, and the sealing rubber ring 5 forms a generally C-shaped structure. 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 along the diameter direction from inside to outside under the action of centrifugal force, which can further reduce the probability of external water, dust, and the like entering the motor interior.

[0077] The plastic-encased body 41 is formed with motor mounting feet 412, that is, the motor mounting feet 412 are integrally injection molded with the plastic-encased body 41, which can further simplify the manufacturing process of the motor. The aforementioned motor mounting feet 412 generally have three, and the three motor mounting feet 412 are uniformly and spacedly arranged around the rotating shaft 3.

[0078] The stator assembly includes 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 eccentrically arranged, and the tooth top arc surface and the inner radial surface of the core form an air gap with unequal widths, thereby improving the sine degree of air gap flux density and reducing the torque ripple of the motor.

[0079] In some embodiments, when the outer rotor motor is in use, the central axis of the rotating shaft 3 is on a horizontal plane, the radial outer slot vertical wall is a flared structure that expands toward the outside end surface of the rotor core 1, and the one-side flaring angle of the flared structure is a, and 5° < a ≤ 30°, which can form a slope that guides external water to the outside of the motor, preventing external water from entering the motor interior. 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 outside end surface of the rotor core 1, and 1 mm < d ≤ 10 mm, so as to prevent water from flowing into the annular gap from the upper inclined surface when the motor is horizontally installed on a load, thereby improving the waterproof performance.

[0080] Further referring to Figure 14As shown, in some embodiments, the radially outer groove upright wall comprises a first water retaining slope 4111 and a second water retaining slope 4112, which are sequentially arranged along the axial direction of the rotating shaft 3 from the non-outside end to the outside 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, thereby forming a step structure sequentially decreasing from inside to outside of the matching ring groove 411, and the second water retaining slope 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.

[0081] In some embodiments, the plastic coated body 41 comprises a first end plate (not marked in the figure) covering one end of the stator assembly away from the outside end of the rotor core 1, and a first bearing chamber 413 is formed on the first end plate, the plastic coated body 41 comprises a second end plate (not marked in the figure) covering one end of the stator assembly close to the outside 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 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 plastic coated body 41, which can further simplify the structure of the motor.

[0082] Specifically referring to Figure 13 As shown, the first bearing 61 is provided with a first retainer ring 33 (sleeved on the rotating shaft 3, which can specifically adopt a circlip) away from one end of the outer rotor assembly, which can form positioning on one axial side of the first bearing 61 overfitting on the rotating shaft 3, the second bearing 62 is provided with a second retainer ring 34 (sleeved on the rotating shaft 3, which can specifically adopt a circlip) away from one end of the stator assembly 4, which can form positioning on the other axial side of the second bearing 62 overfitting on the rotating shaft 3, a spring washer 32 is arranged on 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 overfittingly assembled in the first bearing chamber 413, and the outer ring of the second bearing 62 is overfittingly assembled in the second bearing chamber 414, thereby objectively realizing the axial positioning between the outer rotor assembly and the stator assembly 4 through the aforementioned rotating shaft 3.

[0083] In some embodiments, the stator assembly comprises a stator core 421, which is formed with a supporting annular surface (not labeled in the figure) on the end surface of the out-shaft end of the rotor core 1, the supporting annular surface is coaxially arranged with the first bearing chamber 413, and the annular surface width of the supporting annular surface is w, 3mm < w, so as to ensure reliable support and positioning of the bottom end surface of the stator assembly during overall plastic packaging of the stator assembly 4.

[0084] According to the embodiments of the present application, a manufacturing method of the outer rotor assembly is also provided, which comprises the following steps:

[0085] The bottom end surface of each of the core parts is formed at a preset height (which can be reasonably selected according to actual needs) from the cavity bottom wall of the mold cavity, and the outer side surface of each of the core parts is formed at a preset interval (which can be reasonably selected according to actual needs) from the cavity vertical wall of the mold cavity. The preset height and the preset interval can be positioned and supported by square positioning columns arranged on the cavity bottom wall. The square positioning columns have positioning segments and supporting segments, and the cross sections of the positioning segments and the supporting segments are square. However, the cross-sectional area of the supporting segments is larger than the hole area of the positioning holes 132, so as to stably support the core parts. After the injection molding is completed, a plurality of injection molding support positioning holes 223 are formed on the non-out-shaft end surface of the rotor core 1.

[0086] The shaft 3 is arranged in the central through hole (not labeled in the figure) formed by the core parts in the circular state. The out-shaft segment of the shaft 3 protrudes from the top surface of the core parts.

[0087] The plastic magnetic material is injected into the mold cavity to form the outer rotor assembly.

[0088] Then, the tangential magnet steel parts 21 are formed by tangential magnetization, and the tangential magnetization directions of the two adjacent tangential magnet steel parts 21 are opposite.

[0089] The second stop ring 34 is sleeved on the clamping groove on the side of the shaft 3 close to the out-shaft segment, and then the inner ring of the second bearing 62 is sleeved on the shaft 3 in an interference fit and is axially limited by the second stop ring 34.

[0090] Then, the sealing rubber ring 5 is sleeved on the outer peripheral wall of the housing part 222 and is axially limited by the positioning ring table 2221. Thus, the manufacturing of the outer rotor assembly is completed.

[0091] The technical scheme in the application does not need to position and support the assembled permanent magnet (magnetic steel) in the prior art when manufacturing the outer rotor assembly, and the corresponding injection mold does not need to be specially provided with a corresponding supporting and positioning structure, thereby reducing the manufacturing cost of the outer rotor assembly.

[0092] More specifically, the outer rotor motor is assembled by the following steps:

[0093] According to the manufacturing method of the outer rotor assembly, the independent outer rotor assembly is manufactured, and of course, the stator assembly 4 can also be manufactured synchronously. The stator assembly is assembled as follows:

[0094] 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, and then the first bearing 61 is sleeved in the first bearing chamber 413. The first bearing 61 is fixed in the first bearing chamber 413 by interference fit or adhesive, thereby forming the stator assembly 4.

[0095] Then, the outer rotor assembly and the stator assembly 4 are assembled. First, the elastic pad 32 (which is a spring wave pad) is placed on the bottom wall of the second bearing chamber 414, the non-shaft end of the rotating shaft 3 is inserted into the center through hole of the stator core 421, and then the first stop ring 33 is sleeved on the rotating shaft 3 to finally position the rotating shaft 3 in the axial direction. Thus, the assembly of the outer rotor motor is completed.

[0096] 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.

[0097] 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 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 is not intended to limit the application. Any modification, equivalent replacement and improvement within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An outer rotor assembly, characterized in that: The invention comprises a rotor core (1) and a plastic magnetic material wrapping body (2), wherein the rotor core (1) comprises a plurality of core segments evenly spaced around the central axis thereof, wherein in a circular state, a magnetic steel slot (12) is formed between two adjacent core segments, and each plastic magnetic material wrapping body (2) comprises a tangential magnetic steel portion (21) located in the magnetic steel slot (12), a plastic-wrapped connecting portion (22) wrapped around the radial outer peripheral wall and axial end wall of the core segment, and the plastic magnetic material wrapping body (2) is formed by integral injection molding of plastic magnetic material; the core segment is formed by stacking a plurality of core punching sheets (11), wherein the radial inner side surface of the core of the core punching sheet (11) can match and coincide with the radial outer side surface of the core, and each core punching sheet (11) has a first center alignment in the diameter direction of the rotor core (1). The iron core punching sheet (11) comprises a punching sheet body (111), the radial inner end of the punching sheet body (111) has an inner magnetic stopper (112) extending along the circumference of the rotor iron core (1) toward both sides of the iron core punching sheet (11), the radial inner side surface of the inner magnetic stopper (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), and the projection of the radial inner side surface of the iron core comprises 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 symmetry 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 iron core punching sheet (11) has a plastic-coated connection hole (131) passing through the end surfaces on both sides thereof, and / or the iron core punching sheet (11) has a positioning hole (132) passing through the end surfaces on both sides thereof, and the positioning hole (132) can limit the circumferential rotation of the iron core punching sheet (11).

6. The outer rotor assembly according to claim 1, wherein: A pole port connected to the magnetic steel slot (12) is formed between the radial inner ends of two adjacent core segments. The plastic magnetic material inclusion body (2) has a plurality of clearance grooves (211) on the radial inner side surface of the tangential magnetic steel portion (21). The position of each clearance groove (211) corresponds to the position of each pole port to prevent the plastic magnetic material from being filled in the pole port. The clearance groove (211) extends from the non-axial end face of the rotor core (1) to the axial end face and passes through the axial end face.

7. The outer rotor assembly according to claim 1, wherein: It also includes a rotating shaft (3), the plastic-coated connecting portion (22) includes a rotating shaft connecting portion (221) located on the end surface of the shaft outlet end of the rotor core (1), and the rotating shaft connecting portion (221) is integrally injection-molded and connected to the outer circumferential wall of the rotating shaft (3).

8. The outer rotor assembly according to claim 7, wherein: At least two grooves (31) are formed on the outer circumferential wall of the rotating shaft (3), and the grooves (31) are arranged at intervals around the axis of the rotating shaft (3). The rotating shaft connecting portion (221) has a portion located in each groove (31).

9. 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 8, and the stator assembly (4) includes a stator assembly and a plastic body (41) wrapped around the radial outer side and axial ends of the stator assembly.

10. The outer rotor motor according to claim 9, characterized in that The plastic-wrapped body (41) includes a shell wrapping portion wrapped around the radial outer side of the stator assembly, a matching ring groove (411) is formed on the shell wrapping portion, and the notch of the matching ring groove (411) faces the outer rotor assembly. The plastic-wrapped connecting portion (22) includes a shell portion (222) located on the radial outer peripheral wall of the rotor core (1), and the shell portion (222) and the corresponding portion of the non-axial end of the rotor core (1) are located in the matching ring groove (411). The stator assembly further comprises a sealing rubber ring (5), the sealing rubber ring (5) being arranged between the outer shell portion (222) and the radially outer groove wall of the matching annular groove (411); and / or the plastic package (41) is formed with a motor mounting foot (412); and / or the stator assembly comprises 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.

11. The outer rotor motor according to claim 10, 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 fitted onto the outer shell portion (222), 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 (2221) is provided on the outer wall surface of the outer shell portion (222) 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 (2221).

12. The outer rotor motor according to claim 11, 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).

13. The outer rotor motor according to claim 11, 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.

14. The outer rotor motor according to claim 13, 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).

15. The outer rotor motor according to claim 9, characterized in that The 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), a first bearing chamber (413) being formed on the first end plate, and the 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), a second bearing chamber (414) being 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 is rotatably supported in the second bearing chamber (414) through a second bearing (62).

16. The outer rotor motor according to claim 15, 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.

17. A method for manufacturing an outer rotor assembly according to any one of claims 1 to 8, 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 the rotating shaft (3) at the center through hole formed by each of the iron cores in a circular state; Plastic magnetic material is injected into the mold cavity to form the outer rotor assembly.

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