Outer rotor assembly and hub motor

Abstract

The utility model discloses an outer rotor assembly and a hub motor, and relates to the technical field of motors. The outer rotor assembly comprises a rotor steel ring and a plurality of magnetic steels which are circumferentially arranged in the rotor steel ring at intervals, the inner wall of the rotor steel ring is coated with an annular adhesive layer, one surface, close to the rotor steel ring, of each magnetic steel is adhered to the annular adhesive layer, and a preset gap is formed between every two adjacent magnetic steels; the annular adhesive layer forms a bonding block located between the two adjacent magnetic steels at the preset gap, and the two adjacent magnetic steels are bonded through the bonding block. The arrangement of fixing teeth is omitted, the fixing mode of the magnetic steel is simplified, and the production cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to an outer rotor assembly and a hub motor. Background Art

[0002] Electric motors usually include inner rotor motors and outer rotor motors. Inner rotor motors have stators on the outside and rotors that rotate to generate power. Outer rotor motors have the opposite structure, with the stator in the middle and the rotor on the outside. Outer rotor motors have the characteristics of high efficiency, low noise, light weight, compact structure, and easy installation and maintenance, and have been widely used in the field of electric vehicles.

[0003] In the two-wheeled electric vehicle industry, in order to improve the stability and compactness of the connection, a hub motor (external rotor motor) is usually installed inside the wheel. Its biggest feature is that the power, transmission and braking devices are integrated into the wheel hub, which greatly simplifies the mechanical part of the electric vehicle and is beneficial to improving the overall performance of the two-wheeled electric vehicle.

[0004] In the prior art, when the hub motor magnets are arranged at intervals, positioning teeth are generally provided in the rotor steel ring to fix the magnets through the positioning teeth. This fixing method is relatively complicated and will increase the production cost of the hub motor. Utility Model Content

[0005] The purpose of the present application is to provide an outer rotor assembly and a hub motor, which can simplify the fixing method of the magnetic steel and save production costs.

[0006] The embodiment of the present application is implemented as follows:

[0007] According to one aspect of an embodiment of the present application, an outer rotor assembly is provided, comprising a rotor steel ring and a plurality of magnets circumferentially spaced apart in the rotor steel ring, wherein an inner wall of the rotor steel ring is coated with an annular adhesive layer, a side of the magnet close to the rotor steel ring is bonded to the annular adhesive layer, a preset gap is provided between two adjacent magnets, the annular adhesive layer forms a bonding block located between the two adjacent magnets at the preset gap, and the two adjacent magnets are bonded via the bonding block.

[0008] Optionally, as an implementable manner, the bonding block includes a first bonding surface and a second bonding surface relatively arranged along the arrangement direction of the magnetic steel, the magnetic steel has a first mating surface and a second mating surface relatively arranged along its arrangement direction, the first bonding surface is bonded to the first mating surface, and the second bonding surface is bonded to the second mating surface.

[0009] Optionally, as an implementable manner, along the radial bonding direction of the magnetic steel, the height of the bonding block is less than or equal to the thickness of the magnetic steel.

[0010] Optionally, as an implementable manner, along the radial bonding direction of the magnetic steel, the height of the bonding block is greater than or equal to 2 / 3 of the thickness of the magnetic steel.

[0011] Optionally, as an implementable manner, the annular adhesive layer forms a plurality of adhesive rings along the axial direction of the rotor steel ring, and the plurality of adhesive rings are arranged at intervals.

[0012] Optionally, as an implementable manner, the axial width of the annular adhesive layer is smaller than the axial length of the magnetic steel.

[0013] Optionally, as an implementable manner, the axial width of the annular adhesive layer is greater than 1 / 2 of the axial length of the magnetic steel.

[0014] Optionally, as an practicable manner, the material of the annular adhesive layer is epoxy glue.

[0015] Optionally, as an implementable manner, the number of the magnetic steels is 40-70.

[0016] Another aspect of an embodiment of the present application provides a hub motor, comprising an outer rotor assembly as described in any one of the above, and a stator assembly arranged in the outer rotor assembly, the stator assembly comprising a stator frame, and a plurality of stator cores arranged on the outer ring of the stator frame.

[0017] The beneficial effects of the embodiments of the present application include:

[0018] The outer rotor assembly and the hub motor provided by the present application include a rotor steel ring and a plurality of magnets arranged in the rotor steel ring at circumferential intervals, the inner wall of the rotor steel ring is coated with an annular adhesive layer, the side of the magnet close to the rotor steel ring is adhered to the annular adhesive layer, there is a preset gap between two adjacent magnets, the annular adhesive layer forms an adhesive block located between the two adjacent magnets at the preset gap, and the two adjacent magnets are adhered by the adhesive block. The setting of the fixed teeth is omitted, the fixing method of the magnets is simplified, and the production cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 One of the structural schematic diagrams of the outer rotor assembly provided in the embodiment of the present application;

[0021] Figure 2 The second structural schematic diagram of the outer rotor assembly provided in the embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of the hub motor provided in an embodiment of the present application.

[0023] Icon: 100-outer rotor assembly; 110-rotor steel ring; 120-magnetic steel; 121-first mating surface; 122-second mating surface; 130-annular adhesive layer; 131-adhesive block; 1311-first adhesive surface; 1312-second adhesive surface; 132-adhesive ring; 200-hub motor; 300-stator assembly. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] Please refer to Figure 1 , Figure 2 and Figure 3The present embodiment provides an outer rotor assembly 100, including a rotor steel ring 110 and a plurality of magnets 120 circumferentially spaced in the rotor steel ring 110, the inner wall of the rotor steel ring 110 is coated with an annular adhesive layer 130, a side of the magnet 120 close to the rotor steel ring 110 is adhered to the annular adhesive layer 130, a preset gap is provided between two adjacent magnets 120, the annular adhesive layer 130 forms an adhesive block 131 located between the two adjacent magnets 120 at the preset gap, and the two adjacent magnets 120 are adhered by the adhesive block 131.

[0029] When assembling the outer rotor assembly 100 of the present application, an annular adhesive layer 130 is coated on the inner ring of the rotor steel ring 110, and then the magnetic steels 120 are pressed onto the annular adhesive layer 130 in sequence and at intervals, with a preset gap between two adjacent magnetic steels 120. The annular adhesive layer 130 forms a bonding block 131 located between the two adjacent magnetic steels 120 at the preset gap, and the bonding block 131 bonds the two adjacent magnetic steels 120.

[0030] The annular adhesive layer 130 is used to form an adhesive block 131 between two adjacent magnets 120 at a preset gap to achieve the function of the bracket. While ensuring the stable fixation of the magnet 120, it can also improve the installation efficiency of the magnet 120 and save production costs.

[0031] On the one hand, compared with the previous form of setting fixed teeth for fixing, there is no need to set fixed teeth on the inner ring of the rotor steel ring 110 and then install the magnetic steel 120 between the fixed teeth. This installation method is more complicated. The setting form of the present application can improve the installation efficiency of the outer rotor assembly 100. On the other hand, the setting of the fixed teeth is omitted, which can save production costs.

[0032] The present application arranges the magnetic steels 120 at intervals to make the magnetic flux lines generated between the magnetic steels 120 more evenly distributed, making the hub motor 200 run more smoothly, and also ensuring the required magnetic strength and required performance while reducing the amount of magnetic steels 120 used.

[0033] The outer rotor assembly 100 provided in the present application comprises a rotor steel ring 110 and a plurality of magnetic steels 120 circumferentially spaced in the rotor steel ring 110, the inner wall of the rotor steel ring 110 is coated with an annular adhesive layer 130, the side of the magnetic steel 120 close to the rotor steel ring 110 is adhered to the annular adhesive layer 130, there is a preset gap between two adjacent magnetic steels 120, the annular adhesive layer 130 forms an adhesive block 131 located between the two adjacent magnetic steels 120 at the preset gap, and the two adjacent magnetic steels 120 are adhered by the adhesive block 131. The setting of the fixed teeth is omitted, the fixing method of the magnetic steel 120 is simplified, and the production cost is saved.

[0034] In a feasible embodiment of the present application, Figure 1 , Figure 2 and Figure 3 As shown, the bonding block 131 includes a first bonding surface 1311 and a second bonding surface 1312 which are relatively arranged along the arrangement direction of the magnetic steel 120. The magnetic steel 120 has a first mating surface 121 and a second mating surface 122 which are relatively arranged along its arrangement direction. The first bonding surface 1311 is bonded to the first mating surface 121, and the second bonding surface 1312 is bonded to the second mating surface 122.

[0035] Specifically, the first bonding surface 1311 of the bonding block 131 is bonded to the first mating surface 121 of the magnetic steel 120, and the second bonding surface 1312 of the bonding block 131 is bonded to the second mating surface 122 of the magnetic steel 120, so that three surfaces of a piece of magnetic steel 120 are bonded and fixed to ensure stable fixation of the magnetic steel 120.

[0036] In a feasible embodiment of the present application, Figure 1 , Figure 2 and Figure 3 As shown, along the radial bonding direction of the magnetic steel 120 , the height of the bonding block 131 is less than or equal to the thickness of the magnetic steel 120 .

[0037] The height of the bonding block 131 is set to be smaller than the thickness of the magnetic steel 120 to prevent the height of the bonding block 131 from affecting the installation of the stator assembly 300 after the magnetic steel 120 is fixedly installed.

[0038] Furthermore, along the radial bonding direction of the magnetic steel 120 , the height of the bonding block 131 is greater than or equal to 2 / 3 of the thickness of the magnetic steel 120 .

[0039] Specifically, the height of the bonding block 131 is greater than or equal to 2 / 3 of the thickness of the magnetic steel 120, so as to ensure that the contact area between the first bonding surface 1311 of the bonding block 131 and the first mating surface 121 of the magnetic steel 120 is large enough, so that the first bonding surface 1311 of the bonding block 131 and the first mating surface 121 of the magnetic steel 120 can be stably bonded, so as to ensure that the contact area between the second bonding surface 1312 of the bonding block 131 and the second mating surface 122 of the magnetic steel 120 is large enough, so that the second bonding surface 1312 of the bonding block 131 and the second mating surface 122 of the magnetic steel 120 can be stably bonded, so that the three surfaces of the magnetic steel 120 can be stably bonded and fixed, ensuring the stable limiting fixation of the magnetic steel 120.

[0040] The height of the bonding block 131 is set to be smaller than the thickness of the magnetic steel 120 and greater than or equal to 2 / 3 of the thickness of the magnetic steel 120 , so that the magnetic steel 120 can be stably bonded and fixed.

[0041] In a feasible embodiment of the present application, Figure 1 , Figure 2 and Figure 3As shown, the annular adhesive layer 130 forms a plurality of adhesive rings 132 along the axial direction of the rotor steel ring 110 , and the plurality of adhesive rings 132 are arranged at intervals.

[0042] Specifically, the annular adhesive layer 130 is formed into multiple circles of adhesive layers along the axial direction of the rotor steel ring 110 . On the one hand, it can facilitate the coating of the annular adhesive layer 130 , and on the other hand, it can save the adhesive layer material while ensuring that the annular adhesive layer 130 can stably fix the magnetic steel 120 .

[0043] When assembling the outer rotor assembly 100 of the present application, multiple circles of adhesive rings 132 are coated on the inner ring of the rotor steel ring 110 to form an annular adhesive layer 130, and then the magnetic steels 120 are pressed and arranged on the annular adhesive layer 130 in sequence at intervals, with a preset gap between two adjacent magnetic steels 120. The annular adhesive layer 130 forms an adhesive block 131 located between the two adjacent magnetic steels 120 at the preset gap, and the adhesive block 131 bonds the two adjacent magnetic steels 120.

[0044] In a feasible embodiment of the present application, Figure 1 , Figure 2 and Figure 3 As shown, the axial width of the annular adhesive layer 130 is smaller than the axial length of the magnetic steel 120 .

[0045] Specifically, the axial width of the annular adhesive layer 130 is smaller than the axial length of the magnetic steel 120 to prevent the height of the adhesive block 131 from being higher than the thickness of the magnetic steel 120 after the magnetic steel 120 is fixedly installed, thereby affecting the installation of the stator assembly 300 .

[0046] For example, when the annular adhesive layer 130 is a plurality of adhesive rings 132 formed along the axial direction of the rotor steel ring 110 , the total axial width of the plurality of adhesive rings 132 needs to be smaller than the total width of the magnetic steel 120 .

[0047] In a feasible embodiment of the present application, Figure 1 , Figure 2 and Figure 3 As shown, the axial width of the annular adhesive layer 130 is greater than 1 / 2 of the axial length of the magnetic steel 120 .

[0048] Specifically, the axial width of the annular adhesive layer 130 is greater than 1 / 2 of the axial length of the magnetic steel 120 to ensure that the magnetic steel 120 can be stably bonded in the radial bonding direction.

[0049] For example, when the annular adhesive layer 130 is a plurality of adhesive rings 132 formed along the axial direction of the rotor steel ring 110 , the total axial width of the plurality of adhesive rings 132 needs to be greater than 1 / 2 of the axial length of the magnetic steel 120 .

[0050] Specifically, the axial width of the annular adhesive layer 130 is greater than 1 / 2 of the axial length of the magnetic steel 120 and less than the axial length of the magnetic steel 120 to ensure that the magnetic steel 120 can be stably bonded in the radial bonding direction.

[0051] In a feasible embodiment of the present application, Figure 1 , Figure 2 and Figure 3 As shown, the material of the annular adhesive layer 130 is epoxy adhesive.

[0052] Specifically, the epoxy adhesive is in a liquid paste before heating and solidifies after heating. When assembling the outer rotor assembly 100 of the present application, multiple adhesive rings 132 are coated on the inner ring of the rotor steel ring 110 to form an annular adhesive layer 130, and then the magnetic steels 120 are sequentially pressed on the annular adhesive layer 130 at intervals, with a preset gap between two adjacent magnetic steels 120, and the annular adhesive layer 130 forms an adhesive block 131 located between the two adjacent magnetic steels 120 at the preset gap, and the first adhesive surface 1311 of the adhesive block 131 is bonded to the first mating surface 121 of the magnetic steel 120, and the second adhesive surface 1312 of the adhesive block 131 is bonded to the second mating surface 122 of the magnetic steel 120. After the assembly is completed, the epoxy adhesive is heated and solidified so that the adhesive block 131 forms a bracket support between two adjacent magnetic steels 120 to prevent the magnetic steel 120 from moving when the hub motor 200 is working.

[0053] In a feasible embodiment of the present application, Figure 1 , Figure 2 and Figure 3 As shown, the number of the magnetic steels 120 is 40-70.

[0054] For example, the number of the magnetic steels 120 can be set to 40, 50 or 60, etc., and can be flexibly set according to actual conditions.

[0055] Specifically, when the number of the magnetic steels 120 is 50, when assembling the outer rotor assembly 100 of the present application, a plurality of adhesive rings 132 are coated on the inner ring of the rotor steel ring 110 to form an annular adhesive layer 130, and the axial width of the annular adhesive layer 130 is greater than 1 / 2 of the axial length of the magnetic steel 120 and less than the axial length of the magnetic steel 120, and then 50 magnetic steels 120 are sequentially pressed on the annular adhesive layer 130 at intervals, and there is a preset gap between two adjacent magnetic steels 120, and the annular adhesive layer 130 is formed at the preset gap between the two adjacent magnetic steels 120. The bonding block 131 between the two adjacent pieces of magnetic steel 120 has a height that is less than the thickness of the magnetic steel 120 and greater than or equal to 2 / 3 of the thickness of the magnetic steel 120, so that the first bonding surface 1311 of the bonding block 131 stably bonds the first matching surface 121 of the magnetic steel 120, and the second bonding surface 1312 of the bonding block 131 stably bonds the second matching surface 122 of the magnetic steel 120. After the assembly is completed, the epoxy glue is heated and cured so that the bonding block 131 forms a bracket support between two adjacent pieces of magnetic steel 120 to prevent the magnetic steel 120 from moving when the hub motor 200 is working.

[0056] The embodiment of the present application also discloses a hub motor 200, including a stator assembly 300 and an outer rotor assembly 100 in the aforementioned embodiment, wherein the stator assembly 300 includes a stator frame and a plurality of stator cores arranged on the outer ring of the stator frame. The hub motor 200 includes the same structure and beneficial effects as the outer rotor assembly 100 in the aforementioned embodiment. The structure and beneficial effects of the outer rotor assembly 100 have been described in detail in the aforementioned embodiment and will not be repeated here.

[0057] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An outer rotor assembly, characterized in that: It includes a rotor steel ring and a plurality of magnetic steels circumferentially spaced inside the rotor steel ring, wherein the inner wall of the rotor steel ring is coated with an annular adhesive layer, a side of the magnetic steel close to the rotor steel ring is bonded to the annular adhesive layer, a preset gap is provided between two adjacent magnetic steels, the annular adhesive layer forms a bonding block located between two adjacent magnetic steels at the preset gap, and the two adjacent magnetic steels are bonded by the bonding block.

2. The outer rotor assembly according to claim 1, characterized in that: The bonding block includes a first bonding surface and a second bonding surface which are arranged opposite to each other along the arrangement direction of the magnetic steel. The magnetic steel has a first mating surface and a second mating surface which are arranged opposite to each other along the arrangement direction thereof. The first bonding surface is bonded to the first mating surface, and the second bonding surface is bonded to the second mating surface.

3. The outer rotor assembly according to claim 1, characterized in that: Along the radial bonding direction of the magnetic steel, the height of the bonding block is less than or equal to the thickness of the magnetic steel.

4. The outer rotor assembly according to claim 3, characterized in that: Along the radial bonding direction of the magnetic steel, the height of the bonding block is greater than or equal to 2 / 3 of the thickness of the magnetic steel.

5. The outer rotor assembly according to claim 1, characterized in that: The annular adhesive layer forms a plurality of adhesive rings along the axial direction of the rotor steel ring, and the plurality of adhesive rings are arranged at intervals.

6. The outer rotor assembly according to claim 1, characterized in that: The axial width of the annular adhesive layer is smaller than the axial length of the magnetic steel.

7. The outer rotor assembly according to claim 6, characterized in that: The axial width of the annular adhesive layer is greater than 1 / 2 of the axial length of the magnetic steel.

8. The outer rotor assembly according to claim 1, characterized in that: The material of the annular adhesive layer is epoxy adhesive.

9. The outer rotor assembly according to claim 1, characterized in that: The number of the magnetic steels is 40-70.

10. A hub motor, characterized in that: It comprises the outer rotor assembly according to any one of claims 1 to 9, and a stator assembly arranged in the outer rotor assembly, wherein the stator assembly comprises a stator frame, and a plurality of stator cores arranged on the outer ring of the stator frame.

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