Combined magnetic ring, motor and glue pouring fan

Abstract

The utility model is suitable for the technical field of motors, and provides a combined magnetic ring, a motor and a glue pouring fan. The combined magnetic ring comprises a magnetic main ring body and a plurality of magnetic parts, the plurality of magnetic parts are wrapped in the side wall of the magnetic main ring body, and the plurality of magnetic parts are uniformly distributed along the circumferential direction of the magnetic main ring body. The motor comprises any one of the combined magnetic rings. The glue pouring fan comprises the motor. When the combined magnetic ring is manufactured, the magnetic main ring body can be manufactured by adopting a material with better corrosion resistance, and meanwhile, the magnetic part is manufactured by adopting a high-magnetism material. Compared with a magnet ring in the prior art, the combined magnet in the embodiment has good corrosion resistance so as to achieve the purpose of salt mist, meanwhile, the combined magnet integrally has high magnetism so that the intensity of a magnetic field can be guaranteed, and the overall efficiency of a motor and a fan is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fan technical field especially relates to a combination magnetic ring, motor and glue filling fan. BACKGROUND

[0002] Magnetic ring is the important component in motor, and the magnetic ring can produce stable and strong magnetic field. When the winding in motor is electrified, it will produce a magnetic field which interacts with the magnetic field of the magnetic ring. The current-carrying conductor will be affected by force in the magnetic field, so that the magnetic ring and winding of motor produce rotary motion, and then realize the conversion from electric energy to mechanical energy. The performance of the magnetic ring itself directly affects the performance of the motor. At the same time, the motor needs to work in the environment with salt mist, sand, dust and the like. At this time, the magnetic ring also needs to have certain corrosion resistance, so that the motor has certain protection ability to meet the requirements of salt mist. However, the existing magnetic ring mostly has the problem of being unable to balance the performance of the motor and the corrosion resistance of itself. SUMMARY

[0003] The utility model discloses a kind of combination magnetic ring, motor and glue filling fan, to solve the problem that the magnetic ring in prior art cannot balance the performance of motor and corrosion resistance.

[0004] The utility model is realized as follows, first, provide a kind of combination magnetic ring, including magnetic main ring body and magnetic piece, the number of the magnetic piece is multiple, multiple The magnetic piece is all coated in the side wall of the magnetic main ring body, and multiple the magnetic piece is evenly distributed along the circumference of the magnetic main ring body.

[0005] In an optional embodiment, along the circumference of the magnetic main ring body, the combination magnetic ring is divided into multiple arc polarity zones, the number of the magnetic piece matches the number of the arc polarity zone, and one magnetic piece is provided in each arc polarity zone.

[0006] In an optional embodiment, along the circumference of the magnetic main ring body, the magnetic piece is located in the middle of the arc polarity zone corresponding to the magnetic piece.

[0007] In an optional embodiment, the magnetic piece is a circular arc piece, the center of the magnetic piece and the center of the magnetic main ring body coincide with each other, the outer diameter of the magnetic piece is smaller than the outer diameter of the magnetic main ring body, and the inner diameter of the magnetic piece is greater than the inner diameter of the magnetic main ring body.

[0008] In an optional embodiment, along the circumference of the magnetic main ring body, the arc length of the magnetic piece is a first arc length, the arc length of the arc polarity zone opposite to the magnetic piece is a second arc length, and the ratio of the first arc length to the second arc length is 1:1.5 to 1:2.5.

[0009] In an alternative embodiment, the thickness of the magnetic member along the radial direction of the magnetic main ring body is a first thickness, the thickness of the magnetic main ring body along the radial direction of itself is a second thickness, and the ratio between the first thickness and the second thickness is 1:1.5 to 1:2.

[0010] In an alternative embodiment, the height of the magnetic member along the axial direction of the magnetic main ring body is a first height, the height of the magnetic main ring body along the axial direction of itself is a second height, and the ratio between the first height and the second height is 1:1.05 to 1:1.2.

[0011] In an alternative embodiment, the magnetic main ring body is an injection molded magnet, and the magnetic main ring body is coated on the outside of the magnetic member by a coating process.

[0012] In a second aspect, a motor is provided, comprising the combined magnetic ring of any one of the above.

[0013] In a third aspect, a glue-filled fan is provided, comprising the motor of the above.

[0014] The technical effect of the first aspect of the present application is that: by setting the magnetic main ring body and the plurality of magnetic members, and coating the plurality of magnetic members in the side wall of the magnetic main ring body, and simultaneously uniformly distributing the plurality of magnetic members along the circumferential direction of the magnetic main ring body, the magnetic main ring body can be made of a material with good corrosion resistance, and the magnetic member can be made of a material with high magnetism. Compared with the magnetic ring in the prior art, the combined magnet in the present embodiment has good corrosion resistance to achieve the purpose of salt spray, and the whole has high magnetism to ensure the strength of the magnetic field and improve the overall efficiency of the motor and the fan.

[0015] It can be understood that the beneficial effects of the second aspect and the third aspect described above can be referred to the related description in the first aspect described above, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 is a structural schematic view of the combined magnetic ring provided by the embodiments of the present application;

[0018] Figure 2 is a top view structural schematic view of the combined magnetic ring provided by the embodiments of the present application;

[0019] Figure 3 is Figure 2 is a schematic view of a cross-sectional structure along line A-A in the middle;

[0020] Figure 4 is a schematic view of a side structure of a combined magnetic ring provided by an embodiment of the present application;

[0021] Figure 5 is Figure 4 is a schematic view of a cross-sectional structure along line B-B in the middle;

[0022] Figure 6 is a waveform comparison diagram of a combined magnetic ring and an existing magnetic ring provided by an embodiment of the present application;

[0023] Figure 7 is a PQ curve comparison diagram of a fan using a combined magnetic ring and an existing fan.

[0024] Explanation of reference signs:

[0025] 1, magnetic main ring body; 2, magnetic member. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0027] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] In the utility model, unless another definite provision and limitation, the terms "mount", "connect", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two element internal communication or two element mutual action relation. For ordinary skilled person in the art, the above terms can be understood according to the specific meaning in the utility model.

[0030] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following combines with the embodiment, and the utility model is further detailed.

[0031] Please refer to Figures 1 to 5 In the utility model embodiment, the first aspect provides a kind of combined magnetic ring, including magnetic main ring body 1 and magnetic piece 2, the quantity of magnetic piece 2 is multiple, multiple magnetic piece 2 are all coated in the side wall of magnetic main ring body 1, and multiple magnetic piece 2 is evenly distributed along the circumference of magnetic main ring body 1.

[0032] Specifically, magnetic main ring body 1 refers to the annular component with magnetism, the shape of magnetic main ring body 1 enables it to provide continuous magnetic field path, so that the magnetic field forms relatively closed loop in ring, reduces magnetic field leakage and improves the utilization efficiency of magnetic field.In the manufacture of magnetic main ring body 1, magnetic powder, adhesive and other additives can be mixed uniformly according to certain proportion, so that the magnetic powder is uniformly dispersed in the adhesive.Then compression molding, injection molding or extrusion molding method can be used to form the mixed material into annular magnetic main ring body 1, wherein the magnetic powder can be samarium-cobalt alloy material, and the magnetic powder can be ferrite material (main component is a composite oxide of two iron trioxide and other one or more metal oxides), so that the formed magnetic main ring body 1 can have good stability, high curie temperature and corrosion resistance.

[0033] Magnetic piece 2 refers to a component with a certain volume and magnetism, and the shape of magnetic piece 2 can be plate-shaped, block-shaped or columnar, etc., and magnetic piece 2 can also be composed of multiple shapes.Magnetic piece 2 can be processed and formed by sintering, bonding or injection molding process, and magnetic piece 2 can be made of high-magnetic materials such as neodymium iron boron, so that magnetic piece 2 can have high magnetism, and at the same time, when magnetic piece 2 is disturbed by external magnetic field or affected by other factors, the magnetism of magnetic piece 2 is not easy to be demagnetized, and the magnetic stability of magnetic piece 2 is improved.

[0034] The multiple magnetic pieces 2 are all wrapped in the side wall of the magnetic main ring body 1, that is, the magnetic pieces 2 are completely located in the material constituting the magnetic main ring body 1. The magnetic main ring body 1 can be wrapped outside the magnetic pieces 2 by using an injection molding wrapping process, or a mounting groove for mounting the magnetic pieces 2 can be reserved on the magnetic main ring body 1 during the manufacturing process of the magnetic main ring body 1, and the mouth of the mounting groove is sealed by using the same material as that of the magnetic main ring body 1 after the magnetic pieces 2 are mounted in the mounting groove, so that the magnetic pieces 2 are all wrapped in the side wall of the magnetic main ring body 1. The magnetic main ring body 1 can also be divided into two parts, and the magnetic pieces 2 can be clamped between the two parts, so that the magnetic pieces 2 are all wrapped in the side wall of the magnetic main ring body 1, and the combined magnetic ring is more convenient to manufacture.

[0035] The combined magnetic ring provided by the embodiment of the utility model, through setting magnetic main ring body 1 and multiple magnetic pieces 2, and wrapping multiple magnetic pieces 2 in the side wall of magnetic main ring body 1, simultaneously, multiple magnetic pieces 2 are evenly distributed along the circumference of magnetic main ring body 1, can adopt the material with better corrosion resistance to manufacture magnetic main ring body 1, simultaneously, adopt the material with high magnetism to manufacture magnetic piece 2. Compared with the magnetic ring in the prior art, make the combined magnet in this embodiment, both have good corrosion resistance to reach the purpose of salt spray, and the whole has high magnetism, can guarantee the strength and uniformity of magnetic field, improve the overall efficiency of motor or fan.

[0036] In one embodiment, please refer to Figure 3 In the embodiment, along the circumference of the magnetic main ring body 1, the combined magnetic ring is equally divided into multiple arc-shaped polarity zones, the number of the magnetic pieces 2 matches the number of the arc-shaped polarity zones, and one magnetic piece 2 is arranged in each arc-shaped polarity zone. Specifically, the arc-shaped polarity zone refers to the region of the magnetic pole after the magnetic main ring body 1 is magnetized. The magnetic pole of the magnetized magnetic main ring body 1 mainly includes N pole and S pole. For the axial magnetization cylindrical magnetic ring, the magnetic poles are usually distributed on the two end faces of the magnetic ring, one end face is N pole and the other end face is S pole. The magnetic force lines start from the S pole, pass through the external space of the magnetic ring and return to the N pole, and in the internal space of the magnetic ring, the magnetic force lines form a closed loop from the N pole to the S pole. For the radial magnetization magnetic ring, the magnetic poles are usually distributed on the inner circumference and the outer circumference of the magnetic ring. The inner circumference is one magnetic pole and the outer circumference is the other magnetic pole. The magnetic force lines start from the magnetic pole of the outer circumference, pass through the radial space of the magnetic ring and enter the magnetic pole of the inner circumference, and in the internal space of the magnetic ring, the magnetic force lines form a closed loop. In the embodiment, along the circumference of the magnetic main ring body 1, multiple N poles and S poles are alternately distributed, which is different from the above two cases, and the number of the magnetic pieces 2 matches the number of the arc-shaped polarity zones, so that one magnetic piece 2 is arranged in each arc-shaped polarity zone. In addition, the polarity of the magnetic piece 2 is the same as the polarity of the arc-shaped polarity zone where the magnetic piece 2 is located, so as to avoid the influence of the mismatch between the polarity of the magnetic piece 2 and the polarity of the arc-shaped polarity zone on the overall magnetic intensity of the combined magnetic ring, and make the overall combined magnetic ring have stronger magnetism.

[0037] In an optional embodiment, referring to Figure 3 In the circumferential direction of the magnetic main ring body 1, the combined magnetic ring is divided into four arc-shaped polarity regions, and the arc length of each arc-shaped polarity region in the circumferential direction of the magnetic main ring body 1 is 1 / 4 of the circumference of the magnetic main ring body 1. Meanwhile, the number of the magnetic members 2 is four. The combined magnetic ring adopts the structure described above, which ensures the stability of the motor on the basis of ensuring the operating efficiency of the motor.

[0038] It should be noted that, in the production process of the combined magnetic ring, the magnetic main ring body 1 and the magnetic member 2 are both non-magnetic. After the magnetic main ring body 1 and the magnetic member 2 are combined by injection molding, the magnetic ring can be magnetized by a magnetizing device according to the division of the arc-shaped polarity region of the combined magnetic ring or the position of the magnetic member 2, so that the polarity of each arc-shaped polarity region of the combined magnetic ring matches the polarity of the corresponding magnetic member 1.

[0039] In an embodiment, referring to Figure 3 In the circumferential direction of the magnetic main ring body 1, the magnetic member 2 is located in the middle of the arc-shaped polarity region corresponding to the magnetic member 2. Specifically, the magnetic member 2 is located in the middle of the arc-shaped polarity region corresponding to the magnetic member 2, which means that the shortest distance of the magnetic member 2 from the two edges of the arc-shaped polarity region is equal. In this embodiment, by locating the magnetic member 2 in the middle of the arc-shaped polarity region corresponding to the magnetic member 2 in the circumferential direction of the magnetic main ring body 1, the magnetic flux distribution of each arc-shaped polarity region is ensured to be more uniform, and thus the magnetic distribution of the combined magnetic ring as a whole is more uniform, improving the operating stability of the motor.

[0040] In an embodiment, referring to Figure 3 The magnetic member 2 is a circular arc-shaped sheet body, the center of the magnetic member 2 coincides with the center of the magnetic main ring body 1, the outer diameter of the magnetic member 2 is smaller than the outer diameter of the magnetic main ring body 1, and the inner diameter of the magnetic member 2 is larger than the inner diameter of the magnetic main ring body 1. Specifically, the circular arc-shaped sheet body refers to a sheet-shaped component with a certain thickness and an overall circular arc shape. In this embodiment, by setting the magnetic member 2 as a circular arc-shaped sheet body and making the center of the magnetic member 2 coincide with the center of the magnetic main ring body 1, the shape of the magnetic member 2 can be more matched with the shape of the magnetic main ring body 1. Meanwhile, the outer diameter of the magnetic member 2 is smaller than the outer diameter of the magnetic main ring body 1, and the inner diameter of the magnetic member 2 is larger than the inner diameter of the magnetic main ring body 1, which can make the magnetic main ring body 1 distributed more uniformly at the two plate surfaces of the magnetic member 2, improving the safety of the installation of the magnetic member 2. In addition, under the premise of ensuring the sealing performance of the installation of the magnetic member 2, the overall magnetic field distribution of the combined magnetic ring can be made more uniform.

[0041] In an embodiment, referring to Figure 3In the circumferential direction of the magnetic main ring body 1, the arc length of the magnetic piece 2 is a first arc length, the arc length of the arc-shaped polarity area opposite to the magnetic piece 2 is a second arc length, and the ratio of the first arc length to the second arc length is 1:1.5 to 1:2.5. Specifically, the arc length of the magnetic piece 2 refers to the total length in the circumferential direction of the magnetic main ring body 1, and the arc length of the arc-shaped polarity area also refers to the total length in the circumferential direction of the magnetic main ring body 1. In this embodiment, by setting the ratio of the first arc length to the second arc length to 1:1.5 to 1:2.5, the overall magnetism of the combined magnetic ring can be ensured, and the physical strength of the combined magnetic ring can also be ensured.

[0042] In an optional embodiment, referring to Figure 3 , the ratio of the first arc length to the second arc length is 1:2, that is, the arc length of the magnetic piece 2 is half of the arc length of the arc-shaped polarity area. The overall magnetism of the combined magnetic ring can be ensured, and the physical strength of the combined magnetic ring can also be ensured. In addition, the production cost can be reduced.

[0043] In an embodiment, referring to Figure 3 , the thickness of the magnetic piece 2 in the radial direction of the magnetic main ring body 1 is a first thickness, the thickness of the magnetic main ring body 1 in the radial direction of itself is a second thickness, and the ratio of the first thickness to the second thickness is 1:1.5 to 1:2. Specifically, the thickness of the magnetic piece 2 in the radial direction of the magnetic main ring body 1 refers to the difference between the outer diameter and the inner diameter of the magnetic piece 2. Similarly, the thickness of the magnetic main ring body 1 in the radial direction of itself refers to the difference between the outer diameter and the inner diameter of the magnetic main ring body 1. In this embodiment, by setting the ratio of the first thickness to the second thickness to 1:1.5 to 1:2, the magnetic piece 2 can be coated inside the magnetic main ring body 1, and the material with a certain thickness can be coated on both sides of the magnetic piece 2 in the radial direction of the magnetic main ring body 1. The installation safety of the magnetic piece 2 can be ensured, and the physical strength of the combined magnetic ring can also be ensured.

[0044] In an optional embodiment, referring to Figure 3 , the ratio of the first thickness to the second thickness is 1.4:2.4, for example, when the thickness of the magnetic piece 2 in the radial direction of the magnetic main ring body 1 is 1.4 mm, the thickness of the magnetic main ring body 1 in the radial direction of itself is 2.4 mm. The magnetic piece 2 can be coated inside the magnetic main ring body 1, and the material with a certain thickness can be coated on both sides of the magnetic piece 2 in the radial direction of the magnetic main ring body 1. The installation safety of the magnetic piece 2 can be ensured, and the physical strength of the combined magnetic ring can also be ensured.

[0045] In an embodiment, referring to Figure 5, the height of the magnetic member 2 along the axial direction of the magnetic main ring body 1 is a first height, the height of the magnetic main ring body 1 along the axial direction of the magnetic main ring body 1 is a second height, and the ratio between the first height and the second height is 1:1.05 to 1:1.2. As a preferred example, the ratio between the first height and the second height is 17.2:18.9, for example, when the height of the magnetic member 2 along the axial direction of the magnetic main ring body 1 is 17.2 mm, the height of the magnetic main ring body 1 along the axial direction of the magnetic main ring body 1 can be 18.9 mm. In this embodiment, by setting the ratio between the first height and the second height to be between 1:1.05 and 1:1.2, it is ensured that after installation, the magnetic member 2 is wrapped with material at both ends along the axial direction of the magnetic main ring body 1, which makes the installation of the magnetic member 2 more secure, and also ensures that the combined magnetic ring has good physical strength while maintaining the magnetic strength of the combined magnetic ring.

[0046] In one embodiment, referring to Figures 1 to 5 , the magnetic main ring body 1 is an injection molded magnet, and the magnetic main ring body 1 is coated on the outside of the magnetic member 2 by a coating process. Specifically, the injection molded magnet refers to a magnetic component formed by injection molding. The coating process refers to a process in which other components are coated inside the formed component during the injection molding process. In this embodiment, the magnetic main ring body 1 is coated on the outside of the magnetic member 2 by injection molding, and during the manufacturing process, the magnetic member 2 can be processed into a predetermined size by any one of the processes such as sintering, bonding or injection molding, and then the surface of the magnetic member 2 is cleaned and placed in a molding mold, and then the material for manufacturing the magnetic main ring body 1 is injected into the mold to wrap the magnetic member 2. The magnetic main ring body 1 is coated on the outside of the magnetic member 2 by the coating process, which can make the installation of the magnetic member 2 more secure, and also make the manufacturing of the combined magnetic ring more convenient, thereby reducing the manufacturing cost of the combined magnetic ring.

[0047] In a second aspect, a motor is provided, which includes the combined magnetic ring of any one of the above. Specifically, the motor refers to a component or assembly that converts electrical energy into mechanical energy and outputs rotational torque, and the motor can drive the fan to rotate. In the motor, the magnetic ring can generate a stable and strong magnetic field. When the winding in the motor is connected with current, a magnetic field that interacts with the magnetic field of the magnetic ring is generated, and the current-carrying conductor is subjected to a force in the magnetic field, thereby generating rotational motion between the magnetic ring and the winding of the motor. Referring to Figure 6 , it can be seen from the curves in the figure that the waveform of the combined magnetic ring provided in this embodiment is significantly better than that of the ordinary injection molded magnetic ring, so that the motor also has better performance after using the combined magnetic ring, and also has better corrosion resistance, so that the motor can better resist the attack of salt mist.

[0048] In a third aspect, a waterproof fan is provided, comprising the motor described above. Specifically, the waterproof fan refers to a fan whose motor part is sealed by pouring waterproof glue, so that the internal electronic components are isolated from the external environment, achieving the purposes of waterproof and dustproof. In order to accommodate the waterproof glue, the motor of the waterproof fan usually needs to have a larger magnetic gap. However, the increase of the magnetic gap will lead to the performance degradation of the motor. In the present embodiment, please refer to Figure 7 As shown in FIG. 22, when the motor of the waterproof fan adopts the combined magnetic ring provided in the present embodiment, the overall efficiency of the fan is improved under the premise that the waterproof fan can resist salt mist, so that the waterproof fan provided in the present embodiment can be well applied to high-speed scenes.

[0049] The above is only a preferred embodiment of the present application, and only the technical principle of the present application is specifically described. These descriptions are only for explaining the principle of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the above explanation, any modification, equivalent replacement and improvement within the spirit and principles of the present application, and other specific embodiments of the present application that can be conceived by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. A combination magnetic ring for generating a magnetic field, characterized in that, The combined magnetic ring comprises a magnetic main ring body and a plurality of magnetic pieces, the magnetic pieces are evenly distributed along the circumference of the magnetic main ring body.

2. The combination magnetic ring of claim 1, wherein, Along the circumference of the magnetic main ring body, the combined magnetic ring is equally divided into a plurality of arc-shaped polarity zones, the number of the magnetic pieces matches the number of the arc-shaped polarity zones, and one magnetic piece is arranged in each arc-shaped polarity zone.

3. The combination magnetic ring of claim 2, wherein, Along the circumference of the magnetic main ring body, the magnetic pieces are located in the middle of the arc-shaped polarity zones corresponding to the magnetic pieces.

4. The combination magnetic ring of claim 2, wherein, The magnetic piece is a circular arc-shaped sheet, the center of the magnetic piece coincides with the center of the magnetic main ring body, the outer diameter of the magnetic piece is smaller than the outer diameter of the magnetic main ring body, and the inner diameter of the magnetic piece is larger than the inner diameter of the magnetic main ring body.

5. The combination magnetic ring of claim 4, wherein, Along the circumference of the magnetic main ring body, the arc length of the magnetic piece is a first arc length, the arc length of the arc-shaped polarity zone opposite to the magnetic piece is a second arc length, and the ratio of the first arc length to the second arc length is 1:1.5 to 1:2.

5.

6. The combination magnetic ring of claim 2, wherein, The thickness of the magnetic piece along the radial direction of the magnetic main ring body is a first thickness, the thickness of the magnetic main ring body along the radial direction of itself is a second thickness, and the ratio of the first thickness to the second thickness is 1:1.5 to 1:

2.

7. The combination magnetic ring of claim 2, wherein, The height of the magnetic piece along the axial direction of the magnetic main ring body is a first height, the height of the magnetic main ring body along the axial direction of itself is a second height, and the ratio of the first height to the second height is 1:1.05 to 1:1.

2.

8. The combination magnetic ring of any one of claims 1 to 7, wherein, The magnetic main ring body is an injection molded magnet, and the magnetic main ring body is coated outside the magnetic piece by a package injection process.

9. An electric machine characterized by The combined magnetic ring comprises a magnetic main ring body and a plurality of magnetic pieces, the magnetic pieces are evenly distributed along the circumference of the magnetic main ring body.

10. A glue filling fan, characterized by, The electric machine comprises the combined magnetic ring. The electric machine comprises the combined magnetic ring.

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