Rotor assembly and hub motor

Abstract

The utility model relates to the technical field of motors for electric vehicles, and particularly discloses a rotor assembly and a hub motor, the rotor assembly comprises a rim, an inner ring body and a rotor iron core, the rim is fixedly sleeved on the periphery of the inner ring body, the inner ring body is made of non-magnetic conductive composite materials, the inner ring body is sleeved on the periphery of the rotor iron core at intervals to form a glue storage channel, and the glue storage channel is made of non-magnetic conductive composite materials. The glue storage channel is filled with a potting material to connect the rotor iron core and the inner ring body, the rotor iron core comprises a plurality of magnetic conductive iron cores, the plurality of magnetic conductive iron cores are uniformly arranged at intervals along the circumferential direction, and magnetic steel is arranged between every two adjacent magnetic conductive iron cores. Through the arrangement, the non-magnetic material in the inner ring body can avoid magnetic leakage of the rotor yoke part, that is, magnetic leakage of a magnet in the rotor iron core is reduced, meanwhile, the purpose that a magnetic field gathers magnetism towards one side of the stator iron core can be achieved, and the utilization rate of electric energy is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors for electric vehicles, in particular to a rotor assembly and a hub motor. Background Art

[0002] With the development and popularization of transportation means, electric two-wheelers play an increasingly important role in people's daily travel. They not only enrich people's travel modes, but also bring fun and convenience to riders. At the same time, with the development of technology and the trend of electrification conducive to carbon neutrality, electric two-wheelers will gradually replace traditional fuel motorcycles. As the most commonly used drive motor for electric two-wheelers, the main function of the hub motor is to provide continuous and stable power for the electric vehicle. It does not require any transmission system, and the driving force directly acts on the wheels, featuring high driving efficiency, compact structure, high reliability, etc.

[0003] The existing hub motors for electric vehicles usually adopt a direct drive mode of an outer rotor plus a stator in terms of structure, and their power is directly output through the outer rotor. However, the existing outer rotor structure usually has a serious problem of magnetic leakage of magnets during operation, further resulting in low utilization rate of electric energy. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a rotor assembly and a hub motor, which can reduce the magnetic leakage of magnets in the rotor core and further improve the utilization rate of electric energy.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, the utility model provides a rotor assembly, including:

[0007] A rim;

[0008] An inner ring body, the rim is fixedly sleeved on the outer periphery of the inner ring body, and the inner ring body is made of a non-magnetic composite material;

[0009] A rotor core, the inner ring body is spaced and sleeved on the outer periphery of the rotor core to form a glue storage channel, and the glue storage channel is filled with potting material to connect the rotor core and the inner ring body. The rotor core includes a plurality of magnetic cores, and the plurality of magnetic cores are arranged at intervals and evenly in the circumferential direction, and a magnet is arranged between two adjacent magnetic cores.

[0010] As a preferred technical solution of the above-mentioned rotor assembly, the inner ring body includes a spoke and a first inner ring. Both the rim and the spoke are made of steel material. The rim is fixedly sleeved on the outer periphery of the spoke. The first inner ring is made of a non-magnetic material. The spoke is sleeved on the outer periphery of the first inner ring. The first inner ring and the spoke are integrally formed by die-casting. The inner peripheral surface of the spoke is provided with a plurality of first annular anti-rotation grooves, and the plurality of first annular anti-rotation grooves are arranged at intervals along the axial direction of the spoke.

[0011] As a preferred technical solution of the above-mentioned rotor assembly, the inner peripheral surface of the first inner ring is provided with a plurality of second annular anti-rotation grooves, and the plurality of second annular anti-rotation grooves are arranged at intervals along the axial direction of the first inner ring. The first inner ring is connected to the rotor core through the potting material.

[0012] As a preferred technical solution of the above-mentioned rotor assembly, the end face of the magnetic conducting core is provided with a plurality of rectangular snap points or a plurality of circular snap points. The end face of the magnetic conducting core is further provided with two slot holes penetrating the magnetic conducting core, and the two slot holes are symmetrically arranged on both sides of the center line of the magnetic conducting core.

[0013] As a preferred technical solution of the above-mentioned rotor assembly, the potting material is an epoxy resin potting adhesive.

[0014] As a preferred technical solution of the above-mentioned rotor assembly, the inner ring body includes a magnetic conducting ring and a second inner ring. The rim is fixedly sleeved on the magnetic conducting ring. The second inner ring is formed by stacking stainless steel thin punching sheets, and a plurality of insertion posts are evenly and spacedly protruded along the circumferential direction of the second inner ring. The outer side wall of each magnetic conducting core is provided with a groove, and the plurality of grooves are arranged in one-to-one correspondence with the plurality of insertion posts, and the insertion posts are inserted into the grooves. The magnetic conducting ring is sleeved and connected to the outer periphery of the second inner ring.

[0015] As a preferred technical solution of the above-mentioned rotor assembly, the inner ring body includes a magnetic conducting ring and a plurality of snap rings. The rim is fixedly sleeved on the magnetic conducting ring. The snap rings are made of non-magnetic materials. A plurality of installation grooves are provided on the inner circumference of the magnetic conducting ring, and the plurality of installation grooves are arranged at intervals along the axial direction of the magnetic conducting ring. The plurality of snap rings are arranged in one-to-one correspondence in the plurality of installation grooves.

[0016] As a preferred technical solution of the above-mentioned rotor assembly, the inner ring body includes a magnetic conducting ring and a third inner ring. The third inner ring is fixedly connected inside the magnetic conducting ring. The third inner ring is made of non-magnetic material, and in the radial direction of the magnetic conducting ring, the third inner ring is spaced from the magnetic conducting ring.

[0017] As a preferred technical solution of the above rotor assembly, a plurality of through holes are formed in the third inner ring, and the shape of the through holes is one or more of circular, elliptical, U-shaped or polygonal.

[0018] On the other hand, the present invention also provides a hub motor, including a stator core, a patch Hall position sensor, a support plate, and the rotor assembly in any of the above solutions. The rotor core is spacedly sleeved on the outer periphery of the stator core. A plurality of positioning grooves are recessed in the outer side wall of the stator core. The support plate is convexly provided with a plurality of bosses. The plurality of bosses are arranged in one-to-one correspondence with the plurality of positioning grooves. The bosses are clamped in the positioning grooves. The patch Hall position sensor is arranged on the support plate and is used for collecting the magnetic field signal of the end face of the magnet.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention provides a rotor assembly and a hub motor. The rotor assembly includes a rim, an inner ring body and a rotor core. The rim is fixedly sleeved on the outer periphery of the inner ring body. The inner ring body is made of a non-magnetic composite material. The inner ring body is spacedly sleeved on the outer periphery of the rotor core to form a glue storage channel. The glue storage channel is filled with potting material to connect the rotor core and the inner ring body. The rotor core includes a plurality of magnetic conductive cores. The plurality of magnetic conductive cores are arranged at intervals and evenly in the circumferential direction. Magnets are arranged between two adjacent magnetic conductive cores. With such a setting, the non-magnetic material in the inner ring body can avoid magnetic leakage in the rotor yoke, that is, reduce the magnetic leakage of the magnets in the rotor core, and at the same time, it can also achieve the purpose of concentrating the magnetic field on one side of the stator core, further improving the utilization rate of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the hub motor provided by the present invention Figure 1 ;

[0022] Figure 2 is a schematic structural diagram of the hub motor provided by the present invention Figure 2 ;

[0023] Figure 3 is a schematic structural diagram of the rotor core and the magnet provided by the present invention;

[0024] Figure 4 is a schematic structural diagram of the rotor assembly provided by the present invention Figure 1 ;

[0025] Figure 5 is a schematic structural diagram of the rotor assembly provided by the present invention Figure 2 ;

[0026] Figure 6 is a schematic structural diagram of the rotor core and the second inner ring provided by the present invention;

[0027] Figure 7 Structural schematic of the rotor assembly provided by the present utility model Figure 3 ;

[0028] Figure 8 Structural schematic of the snap ring provided by the present utility model;

[0029] Figure 9 Structural schematic of the rotor assembly provided by the present utility model Figure 4 ;

[0030] Figure 10 Structural schematic of the stator core provided by the present utility model;

[0031] Figure 11 Structural schematic of the surface mount Hall position sensor and the support plate provided by the present utility model.

[0032] Wherein:

[0033] 1, Rim;

[0034] 2, Rotor core; 21, Magnetic conduction core; 211, Slot hole; 212, Groove;

[0035] 3, Potting compound; 4, Magnet;

[0036] 5, Spoke; 51, First annular anti-rotation groove;

[0037] 6, First inner ring; 61, Second annular anti-rotation groove;

[0038] 7, Magnetic conduction ring;

[0039] 8, Second inner ring; 81, Insert post;

[0040] 9, Snap ring;

[0041] 10, Third inner ring; 101, Through hole;

[0042] 11, Stator core; 111, Positioning groove;

[0043] 12, Surface mount Hall position sensor; 13, Support plate; 14, Boss. Detailed implementation manners

[0044] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0045] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0046] Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed" shall be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal level than the second feature.

[0048] The technical solution of the present utility model will be further described below with reference to the drawings and through specific embodiments.

[0049] Such as Figures 1 to 11As shown in the figure, this embodiment provides a rotor assembly, which includes a rim 1, an inner ring body, and a rotor core 2. The rim 1 is fixedly sleeved on the outer periphery of the inner ring body. The inner ring body is made of a non-magnetic composite material. The inner ring body is spacedly sleeved on the outer periphery of the rotor core 2 to form a glue storage channel. The glue storage channel is filled with potting compound 3 to connect the rotor core 2 and the inner ring body. The rotor core 2 includes a plurality of magnetic cores 21. The plurality of magnetic cores 21 are arranged at intervals and evenly in the circumferential direction. A magnetic steel 4 is arranged between two adjacent magnetic cores 21. With such a setting, the non-magnetic material in the inner ring body can avoid magnetic leakage in the rotor yoke, that is, reduce the magnetic leakage of the magnets in the rotor core 2. At the same time, it can also achieve the purpose of concentrating the magnetic field towards one side of the stator core 11, further improving the utilization rate of electric energy. It should be noted that the potting compound 3 is also filled in the gap between the magnetic steel 4 and the magnetic core 21 to achieve bonding.

[0050] Optionally, the inner ring body includes a spoke 5 and a first inner ring 6. Both the rim 1 and the spoke 5 are made of steel materials, and the rim 1 is fixedly sleeved on the outer periphery of the spoke 5. The first inner ring 6 is made of a non-magnetic material. The spoke 5 is sleeved on the outer periphery of the first inner ring 6. The first inner ring 6 and the spoke 5 are integrally formed by die casting. A plurality of first annular anti-rotation grooves 51 are provided on the inner peripheral surface of the spoke 5. The plurality of first annular anti-rotation grooves 51 are arranged at intervals along the axial direction of the spoke 5. With such a setting, the plurality of first annular anti-rotation grooves 51 make the die-casting surface between the spoke 5 and the first inner ring 6 larger during the die-casting forming operation, preventing relative loosening.

[0051] Further, both the rim 1 and the spoke 5 are made of steel such as SPCC or SPHC, which is convenient for welding between the rim 1 and the inner ring body, reduces the material cost, eliminates the risk of air leakage. At the same time, the first inner ring 6 is made of materials such as aluminum alloy, magnesium alloy or carbon fiber.

[0052] Optionally, in order to increase the bonding surface between the first inner ring 6 and the potting compound 3 and make the bonding between the two more reliable and stable, a plurality of second annular anti-rotation grooves 61 are provided on the inner peripheral surface of the first inner ring 6. The plurality of second annular anti-rotation grooves 61 are arranged at intervals along the axial direction of the first inner ring 6. The first inner ring 6 is connected to the rotor core 2 through the potting compound 3. Further, the potting compound 3 is an epoxy resin potting adhesive. Of course, in other embodiments, the type of the potting compound 3 can also be set according to actual needs and will not be further limited here.

[0053] Optionally, in order to make the lamination of the punching sheets of the rotor core 2 more reliable and increase the lamination coefficient of the rotor core 2, a plurality of rectangular buckles or a plurality of circular buckles are provided on the end face of the magnetic core 21. And, in order to effectively reduce the cogging torque of the motor, two slot holes 211 penetrating the magnetic core 21 are further provided on the end face of the magnetic core 21. The two slot holes 211 are symmetrically arranged on both sides of the center line of the magnetic core 21.

[0054] Optionally, the inner ring body includes a magnetic conductive ring 7 and a second inner ring 8. The rim 1 is fixedly sleeved on the magnetic conductive ring 7. The second inner ring 8 is formed by stacking stainless steel thin punching sheets, and a plurality of insertion posts 81 are convexly provided at equal intervals along the circumferential direction of the second inner ring 8. A groove 212 is provided on the outer side wall of each magnetic conductive core 21. The plurality of grooves 212 are arranged in one-to-one correspondence with the plurality of insertion posts 81, and the insertion posts 81 are inserted into the grooves 212. The magnetic conductive ring 7 is sleeved and adhesively bonded to the outer circumference of the second inner ring 8 with glue. With such a setting, the groove 212 provided on the outer side wall of the magnetic conductive core 21 can further increase the bonding area, making the bonding between the second inner ring 8 and the rotor core 2 more firm and reliable.

[0055] In this embodiment, the insertion posts 81 are in a dovetail shape, the grooves 212 are dovetail grooves, and a plurality of rectangular fastening points or a plurality of circular fastening points are provided on the second inner ring 8.

[0056] Optionally, the inner ring body includes a magnetic conductive ring 7 and a plurality of snap rings 9. The rim 1 is fixedly sleeved on the magnetic conductive ring 7. The snap rings 9 are made of non-magnetic conductive materials. A plurality of mounting grooves are provided on the inner circumference of the magnetic conductive ring 7. The plurality of mounting grooves are arranged at intervals along the axial direction of the magnetic conductive ring 7. The plurality of snap rings 9 are arranged in one-to-one correspondence in the plurality of mounting grooves.

[0057] Furthermore, the snap ring 9 is provided with an inclined opening structure to facilitate installation in the mounting groove on the inner wall of the magnetic conductive ring 7.

[0058] Optionally, the inner ring body includes a magnetic conductive ring 7 and a third inner ring 10. The third inner ring 10 is fixedly connected inside the magnetic conductive ring 7. The third inner ring 10 is made of non-magnetic conductive materials, and in the radial direction along the magnetic conductive ring 7, the third inner ring 10 is spaced from the magnetic conductive ring 7 to form an air flow domain to prevent magnetic leakage from the rotor yoke. Furthermore, the third inner ring 10 is made of stainless steel material and is welded inside the magnetic conductive ring 7.

[0059] Optionally, in order to facilitate the flow of the potting material 3 so that the rotor core 2, the permanent magnet 4 and the magnetic conductive ring 7 are better bonded, the third inner ring 10 is provided with a plurality of through holes 101, and the shape of the through holes 101 is one or more of circular, elliptical, U-shaped or polygonal.

[0060] Please refer to Figure 1 、 Figure 10 and Figure 11As shown in the figure, this embodiment also provides a wheel hub motor, which includes a stator core 11, a surface-mounted Hall position sensor 12, a support plate 13, and the rotor assembly in the above solution. The rotor core 2 is sleeved at intervals on the outer periphery of the stator core 11. A plurality of positioning grooves 111 are recessed on the outer side wall of the stator core 11. A plurality of bosses 14 protrude from the support plate 13. The plurality of bosses 14 are arranged in one-to-one correspondence with the plurality of positioning grooves 111. The bosses 14 are clamped in the positioning grooves 111. The surface-mounted Hall position sensor 12 is arranged on the support plate 13 and is used to collect the magnetic field signal of the end face of the permanent magnet 4. It should be noted that the number of the surface-mounted Hall position sensors 12 is three and they are arranged at equal intervals. Moreover, the surface-mounted Hall position sensor 12 can effectively compress the axial space, avoid the interference of the electromagnetic field on it, and make the detection more accurate.

[0061] In this embodiment, the cross section of the boss 14 is trapezoidal, cylindrical or dovetail-shaped. An axial limiting point is also provided on the support plate 13 to better play the role of locking and limiting.

[0062] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A rotor assembly, characterized in that: include: Rim (1); An inner ring body, wherein the rim (1) is fixedly sleeved on the outer periphery of the inner ring body, and the inner ring body is made of a non-magnetic composite material; A rotor core (2), wherein the inner ring body is sleeved on the outer circumference of the rotor core (2) at intervals to form a glue storage channel, wherein the glue storage channel is filled with a potting material (3) to connect the rotor core (2) and the inner ring body, and wherein the rotor core (2) comprises a plurality of magnetically conductive cores (21), wherein the plurality of magnetically conductive cores (21) are spaced and evenly arranged along a circumferential direction, and a magnetic steel (4) is arranged between two adjacent magnetically conductive cores (21).

2. The rotor assembly according to claim 1, characterized in that: The inner ring body includes spokes (5) and a first inner ring (6); the rim (1) and the spokes (5) are both made of steel, and the rim (1) is fixedly sleeved on the outer periphery of the spokes (5); the first inner ring (6) is made of non-magnetic material, and the spokes (5) are sleeved on the outer periphery of the first inner ring (6); the first inner ring (6) and the spokes (5) are integrally formed by die casting; the inner peripheral surface of the spoke (5) is provided with a plurality of first annular anti-rotation grooves (51), and the plurality of first annular anti-rotation grooves (51) are arranged at intervals along the axial direction of the spoke (5).

3. The rotor assembly according to claim 2, characterized in that: The inner circumferential surface of the first inner ring (6) is provided with a plurality of second annular anti-rotation grooves (61), and the plurality of second annular anti-rotation grooves (61) are arranged at intervals along the axial direction of the first inner ring (6). The first inner ring (6) is connected to the rotor core (2) through the potting material (3).

4. The rotor assembly according to claim 1, characterized in that: The end surface of the magnetically conductive core (21) is provided with a plurality of rectangular buckle points or a plurality of circular buckle points. The end surface of the magnetically conductive core (21) is also provided with two slot holes (211) penetrating the magnetically conductive core (21). The two slot holes (211) are symmetrically arranged on both sides of the center line of the magnetically conductive core (21).

5. The rotor assembly according to any one of claims 1 to 4, characterized in that: The potting material (3) is epoxy resin potting glue.

6. The rotor assembly according to claim 1, characterized in that: The inner ring body comprises a magnetic conductive ring (7) and a second inner ring (8); the wheel rim (1) is fixedly sleeved on the magnetic conductive ring (7); the second inner ring (8) is formed by stacking stainless steel thin punching sheets; and the second inner ring (8) is provided with a plurality of plug posts (81) uniformly and spaced apart along the circumferential direction; the outer wall of each magnetic conductive core (21) is provided with a groove (212); the plurality of grooves (212) and the plurality of plug posts (81) are arranged in a one-to-one correspondence; and the plug posts (81) are inserted into the grooves (212); and the magnetic conductive ring (7) is sleeved and connected to the outer periphery of the second inner ring (8).

7. The rotor assembly according to claim 1, characterized in that: The inner ring body comprises a magnetic conductive ring (7) and a plurality of clamping rings (9); the wheel rim (1) is fixedly sleeved on the magnetic conductive ring (7); the clamping ring (9) is made of a non-magnetic conductive material; a plurality of mounting grooves are arranged on the inner periphery of the magnetic conductive ring (7); the plurality of mounting grooves are arranged at intervals along the axial direction of the magnetic conductive ring (7); and the plurality of clamping rings (9) are arranged in a one-to-one correspondence in the plurality of mounting grooves.

8. The rotor assembly according to claim 1, characterized in that: The inner ring body comprises a magnetic conductive ring (7) and a third inner ring (10); the third inner ring (10) is fixedly connected to the magnetic conductive ring (7); the third inner ring (10) is made of non-magnetic conductive material; and in the radial direction of the magnetic conductive ring (7), the third inner ring (10) and the magnetic conductive ring (7) are spaced apart.

9. The rotor assembly according to claim 8, characterized in that: The third inner ring (10) is provided with a plurality of through holes (101), and the shape of the through holes (101) is one or more of circular, elliptical, U-shaped or polygonal.

10. A hub motor, characterized in that: The invention comprises a stator core (11), a patch Hall position sensor (12), a support plate (13), and a rotor assembly as claimed in any one of claims 1 to 9, wherein the rotor core (2) is sleeved on the outer periphery of the stator core (11) at intervals, the outer side wall of the stator core (11) is recessed with a plurality of positioning grooves (111), the support plate (13) is convexly provided with a plurality of bosses (14), the plurality of bosses (14) are arranged in a one-to-one correspondence with the plurality of positioning grooves (111), the bosses (14) are snapped into the positioning grooves (111), the patch Hall position sensor (12) is arranged on the support plate (13), and is used to collect the magnetic field signal of the end face of the magnetic steel (4).

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