Stator sealing structure of external rotor motor

Abstract

The utility model discloses a stator sealing structure of an external rotor motor. The stator sealing structure comprises a stator structure and a sealing structure. The stator structure comprises a left end ring, a right end ring and an iron core; the sealing structure comprises a gasket, a polymer film and a prestress sheath. The plurality of gaskets are uniformly glued on a cylinder formed by the first cylindrical section, the second cylindrical section and the iron core in the annular direction through an adhesive; the polymer film is arranged on the outer surface of the lining and the parts, not covered by the lining, of the first cylindrical section and the second cylindrical section; and the prestressed sheath is arranged on the outer surface of the polymer film. According to the utility model, the gasket is set as a first seal, the step difference among the left end ring, the right end ring and the iron core can be converted into smooth size transition, and the polymer film is set as a second seal, so that slight leakage possibly occurring at the first seal is thoroughly blocked; and the prestress sheath is set to be a third seal, so that the lining, the polymer film and the stator structure can be pressed tightly, and the sealing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a stator sealing structure for an external rotor motor. Background Technology

[0002] External rotor motors possess advantages such as compact structure and high torque, making them highly valuable for applications in fields like flying cars. The stator of an external rotor motor is located inside the motor, with a typical structure featuring metal end rings at both ends along the axial direction and a stator core in the middle. For high-power external rotor motors, the inner stator is typically cooled by circulating a high-pressure liquid medium, such as oil or water. Although the internal structure of the stator varies, for reasons of weight reduction and electromagnetic performance, the outermost layer is generally a thin-shell structure.

[0003] Because the stator needs to withstand the internal pressure of the cooling medium, its structural design and manufacturing must address not only conventional issues of strength and rigidity but also the structural sealing problem under high pressure. For split-type pressure-bearing structures, common sealing methods for static sealing surfaces include gasket seals, sealing ring seals, labyrinth seals, and resin casting seals. However, at the joint between the end cap and the core, due to the thin wall thickness and minimal venting between the stator and rotor, these sealing methods are difficult to implement. Furthermore, since the end ring and core are generally made of different materials, their structural deformation under load and thermal expansion deformation at high temperatures are inconsistent, further complicating structural sealing.

[0004] Based on the above, this utility model proposes a stator sealing structure for an external rotor motor, which can effectively solve the above problems. Utility Model Content

[0005] This utility model addresses the shortcomings of the existing technology by providing a stator sealing structure for an external rotor motor.

[0006] This utility model is achieved through the following technical solution:

[0007] A stator sealing structure for an external rotor motor includes a stator structure and a sealing structure. The stator structure includes a left end ring, a right end ring, and an iron core. The left end ring includes a first cylindrical segment and a first flange located at its end. The right end ring includes a second cylindrical segment and a second flange located at its end. The first cylindrical segment, the second cylindrical segment, and the iron core have the same outer diameter, and a first splicing surface is formed between the first cylindrical segment and the iron core, and a second splicing surface is formed between the second cylindrical segment and the iron core. The sealing structure includes a liner, a polymer film, and a prestressed sheath. Multiple liners are provided, and the multiple liners are uniformly bonded circumferentially to a cylinder composed of the first cylindrical segment, the second cylindrical segment, and the iron core using an adhesive, and are used to circumferentially cover the first splicing surface and the second splicing surface. The polymer film is disposed on the outer surface of the liner and on the portions of the first and second cylindrical segments not covered by the liner. The prestressed sheath is disposed on the outer surface of the polymer film.

[0008] According to the above technical solution, as a further preferred technical solution, the thickness of the liner is 0.05-0.5mm, and the liner is a thin sheet made of fiber fabric reinforced resin matrix composite material.

[0009] According to the above technical solution, as a further preferred technical solution, the polymer film has a thickness of 0.02 to 0.1 mm, and the polymer film is made of a high-temperature resistant material.

[0010] According to the above technical solution, as a further preferred technical solution, the thickness of the prestressed sheath is 0.2 to 1.0 mm, and the prestressed sheath is made of fiber-reinforced resin-based composite material.

[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0012] This utility model provides a stator sealing structure for an external rotor motor. The liner is used as the first seal, converting the step difference between the left and right end rings and the core caused by load and temperature changes into a smooth dimensional transition, thus providing good protection for the polymer film and prestressed sheath. The polymer film is used as the second seal, completely sealing any minor leaks that may occur at the first seal. The prestressed sheath is used as the third seal, compressing the liner, polymer film, and stator structure to improve the sealing effect. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0015] A stator sealing structure for an external rotor motor includes a stator structure and a sealing structure. The stator structure includes a left end ring 1, a right end ring 2, and an iron core 3. The left end ring 1 includes a first cylindrical section 11 and a first flange 12 located at its end. The right end ring 2 includes a second cylindrical section 21 and a second flange 22 located at its end. The first cylindrical section 11, the second cylindrical section 21, and the iron core 3 have the same outer diameter, and a first splicing surface 4 is formed between the first cylindrical section 11 and the iron core 3, and a second splicing surface 5 is formed between the second cylindrical section 21 and the iron core 3. The sealing structure includes... The system includes a liner 6, a polymer film 7, and a prestressed sheath 8. Multiple liner 6s are provided, and these liner 6s are uniformly bonded circumferentially to a cylinder composed of a first cylindrical section 11, a second cylindrical section 21, and an iron core 3 using an adhesive, and are used to circumferentially cover the first splicing surface 4 and the second splicing surface 5. The polymer film 7 is disposed on the outer surface of the liner 6, and on the portions of the first cylindrical section 11 and the second cylindrical section 21 not covered by the liner 6 (i.e., the liner 6 partially covers the first cylindrical section 11 and the second cylindrical section 21). The prestressed sheath 8 is disposed on the outer surface of the polymer film 7.

[0016] This invention, through the setting of a sealing structure, uses the liner 6 as the first seal. The liner 6 can convert the step difference between the left end ring 1, the right end ring 2 and the iron core 3 caused by load and temperature changes into a smooth dimensional transition, which provides good protection for the polymer film 7 and the prestressed sheath 8. By using the polymer film 3 as the second seal, the slight leakage that may occur at the first seal is completely sealed off. By using the prestressed sheath 8 as the third seal, the liner 6, the polymer film 7 and the stator structure can be compressed together, improving the sealing effect.

[0017] like Figure 1As shown, when a step difference occurs, the liner 6 can convert the step difference between the left end ring 1, the right end ring 2, and the iron core 3 into a smooth dimensional transition. However, when the structure is under high temperature or load, due to the incoordination of structural deformation, slight debonding of the adhesive surfaces of the liner 6 and the left end ring 1, and the right end ring 2 and the iron core 3, is still inevitable, which may form tiny leakage channels. If the liner 6 extends to the first flange 12 and the second flange 22, the leakage caused by the slight debonding will extend from the first splice surface 4 and the second splice surface 5 all the way to the root of the first flange 12 and the second flange 22, forming a gap that is difficult to seal again. However, by partially covering the first cylindrical section 11 and the second cylindrical section 21 with the liner 6, and then covering the entire section with the polymer film 7, the leakage is sealed by the polymer film 7 at the edge of the liner 6, thereby completely eliminating the possibility of leakage.

[0018] Furthermore, in another embodiment, the thickness of the liner 6 is 0.05 to 0.5 mm, and the liner 6 is a sheet made of fiber fabric reinforced resin matrix composite material.

[0019] By adopting the above technical solution, the thickness of the liner 6 is 0.05-0.5mm, with low stiffness, which makes it easier to deform and adhere to the iron core surface. Furthermore, the liner 6 is a thin sheet made of fiber fabric reinforced resin matrix composite material. Fiber fabric reinforced resin matrix composite material usually has the characteristics of being non-magnetic, non-conductive, or weakly conductive, which can reduce electromagnetic loss and maintain the electromagnetic efficiency of the structure. Specific examples include carbon fiber fabric / high temperature resistant resin composite material, glass fiber fabric / high temperature resistant resin composite material, aramid fiber fabric / high temperature resistant resin composite material, etc., and the glass transition temperature Tg of the resin should be higher than the stator operating temperature.

[0020] Furthermore, in another embodiment, the polymer film 7 has a thickness of 0.02 to 0.1 mm, and the polymer film 7 is made of a high-temperature resistant material.

[0021] By adopting the above technical solution, the thickness of the polymer film 7 is 0.02-0.1 mm. If it is too thick, it will occupy too much air, which will affect the electromagnetic performance; if it is too thin, it will lead to a decrease in airtightness and strength. The above-mentioned thickness can ensure that it maintains a good sealing effect when the stator is operating at high temperature. At the same time, the polymer film 7 is made of high-temperature resistant materials, such as polypropylene, polyethylene, polyimide, polyetheretherketone, polyester, etc., but not limited to the above high-temperature materials, and the temperature resistance of the polymer film 7 should be higher than the stator operating temperature.

[0022] Furthermore, in another embodiment, the thickness of the prestressed sheath 8 is 0.2 to 1.0 mm, and the prestressed sheath 8 is made of fiber-reinforced resin-based composite material.

[0023] Specifically, the thickness of the prestressed sheath 8 is 0.2–1.0 mm. If the prestressed sheath 8 is too thin, it will be difficult to effectively constrain the polymer film 3; if the prestressed sheath 8 is too thick, it will obstruct the electromagnetic field. Simultaneously, the prestressed sheath 8 is made of fiber-reinforced resin-based composite materials, such as carbon fiber / high-temperature resistant resin composites, glass fiber / high-temperature resistant resin composites, aramid fiber / high-temperature resistant resin composites, etc., and the glass transition temperature (Tg) of the resin should be higher than the stator's operating temperature. The prestressed sheath is formed using a fiber winding process. During winding, tensile stress is applied to the fibers, causing them to tightly press against the polymer film 3 below. The specific prestress is 20–300 MPa. If the prestress is too low, it will not be able to compress the polymer film 3, easily leading to sealing failure; if the prestress is too high, it will easily cause excessive deformation or even instability in the thin-walled structure.

[0024] Based on the description and drawings of this utility model, those skilled in the art can easily manufacture or use the stator sealing structure of an external rotor motor according to this utility model, and can achieve the positive effects described in this utility model.

[0025] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0026] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A stator sealing structure for an external rotor motor, characterized in that: It includes a stator structure and a sealing structure; the stator structure includes a left end ring (1), a right end ring (2) and an iron core (3); the left end ring (1) includes a first cylindrical section (11) and a first flange (12) located at its end; the right end ring (2) includes a second cylindrical section (21) and a second flange (22) located at its end; the first cylindrical section (11), the second cylindrical section (21) and the iron core (3) have the same outer diameter, and a first splicing surface (4) is formed between the first cylindrical section (11) and the iron core (3), and a second splicing surface (5) is formed between the second cylindrical section (21) and the iron core (3); The sealing structure includes a liner (6), a polymer film (7), and a prestressed sleeve (8); multiple liner (6) are provided, and multiple liner (6) are uniformly bonded in a circumferential direction to a cylinder composed of a first cylindrical section (11), a second cylindrical section (21), and an iron core (3) by an adhesive, and are used to circumferentially cover the first splicing surface (4) and the second splicing surface (5); the polymer film (7) is provided on the outer surface of the liner (6), as well as the parts of the first cylindrical section (11) and the second cylindrical section (21) not covered by the liner (6); the prestressed sleeve (8) is provided on the outer surface of the polymer film (7).

2. The stator sealing structure of an external rotor motor according to claim 1, characterized in that: The thickness of the liner (6) is 0.05 to 0.5 mm, and the liner (6) is a thin sheet made of fiber fabric reinforced resin matrix composite material.

3. The stator sealing structure of an external rotor motor according to claim 1, characterized in that: The polymer film (7) has a thickness of 0.02 to 0.1 mm and is made of a high-temperature resistant material.

4. The stator sealing structure of an external rotor motor according to claim 1, characterized in that: The thickness of the prestressed sheath (8) is 0.2 to 1.0 mm, and the prestressed sheath (8) is made of fiber-reinforced resin-based composite material.

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