Internal circulation structure on external rotor motor

Abstract

The utility model relates to the field of motors, in particular to an internal circulation structure on an external rotor motor, which comprises a stator assembly, an external rotor assembly and a motor end cover with a built-in electric controller element. The outer rotor assembly comprises an outer rotor housing; the stator assembly is installed in the outer rotor housing, and the motor end cover is fixedly connected with the stator assembly. An inner circulating fan is arranged between the stator assembly and the motor end cover; a central shaft linked with the outer rotor housing is arranged at the center of the outer rotor housing; after the stator assembly is installed in the outer rotor housing, the center shaft penetrates through the stator assembly to be connected with the inner circulation fan. According to the scheme, when the outer rotor assembly rotates at a high speed, the inner circulating fan is driven to rotate, and when the inner circulating fan rotates, air in the stator assembly, the motor end cover and the space between the stator assembly and the motor end cover can be promoted to flow to realize inner circulation; therefore, heat in the motor end cover, the stator assembly and other structures can be uniformly distributed, the motor end cover can be fully utilized for heat dissipation, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to an internal circulation structure on an outer rotor motor. Background Art

[0002] The brushless DC external rotor fan has the advantages of small size and high energy efficiency. In its structure, the motor driver is built into the radiator (end cover) and directly connected to the motor. During operation, the motor driver and stator winding will generate a lot of heat. Under the high protection level requirements, a lot of heat can only be dissipated through air radiation, and the heat dissipation efficiency is extremely low. In addition, since the motor driver is concentrated inside the end cover, the internal heat distribution of the entire motor end cover is uneven, resulting in internal heat concentration, which is not easy to effectively dissipate heat. Summary of the invention

[0003] In order to solve the above problems, the purpose of the utility model is to provide an internal circulation structure on an outer rotor motor. When the outer rotor assembly rotates at high speed, it will drive the internal circulation fan to rotate. When the internal circulation fan rotates, it can promote the air flow in the stator assembly, the motor end cover and the space between the two to achieve internal circulation; in this way, the internal heat distribution of the motor end cover, stator assembly and other structures can be evenly distributed, which is conducive to fully utilizing the heat dissipation of the motor end cover and improving the heat dissipation effect.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] An internal circulation structure on an outer rotor motor comprises a stator assembly, an outer rotor assembly, and a motor end cover with an electronic controller element built in; the outer rotor assembly comprises an outer rotor cover; the stator assembly is installed in the outer rotor cover, and the motor end cover is connected and fixed to the stator assembly; it is characterized in that an internal circulation fan is arranged between the stator assembly and the motor end cover, and a central shaft linked to the outer rotor cover is arranged at the center of the outer rotor cover; after the stator assembly is installed in the outer rotor cover, the central shaft passes through the stator assembly and is connected to the internal circulation fan.

[0006] The utility model adopts the above-mentioned technical solution, which relates to an internal circulation structure on an outer rotor motor, in which the stator assembly is installed inside the outer rotor cover, and the motor end cover is connected and fixed to the stator assembly. During operation, the outer rotor assembly rotates at a high speed relative to the stator assembly and the motor end cover. On this basis, the solution is provided with an internal circulation fan between the stator assembly and the motor end cover, and the central axis at the center of the outer rotor cover can pass through the stator assembly and be connected to the internal circulation fan. Therefore, when the outer rotor assembly rotates at a high speed, it will drive the internal circulation fan to rotate. When the internal circulation fan rotates, it can promote the air flow in the stator assembly, the motor end cover and the space between the two to realize internal circulation; in this way, the heat distribution inside the motor end cover, the stator assembly and other structures can be uniform, which is conducive to making full use of the heat dissipation of the motor end cover and improving the heat dissipation effect.

[0007] In a further solution, the stator assembly is sealed at the edge with the motor end cover, and the internal circulation fan drives the internal airflow to circulate when it rotates. The sealed connection between the stator assembly and the motor end cover is conducive to improving the protection capability of the motor and meeting the high protection level requirements.

[0008] In a further solution, the motor end cover is built with an electric controller component, which is potted with a high heat dissipation coefficient potting glue. After the electric controller component is potted, the surface heat dissipation coefficient is 1W / mk, which is 50 times that of air (0.0244W / mk). Compared with the traditional non-potting and non-enhanced air cooling structure, the heat dissipation capacity of the controller is greatly improved. In addition, after the electric controller component is potted with glue, the protection capacity of the electric controller component is also improved, which can adapt to more complex high temperature and high humidity working conditions.

[0009] In a specific implementation, the stator assembly includes a stator body extending into the outer rotor housing, and a flange ring located outside the outer rotor housing; a sinking groove is constructed on the stator body toward the motor end cover, and the motor end cover is fixed to the flange ring of the stator assembly. In this solution, the stator body in the stator assembly extends into the outer rotor housing, and its flange ring is located outside the outer rotor housing. Further, the motor end cover is fixed to the flange ring of the stator assembly, and by setting a sinking groove on the end face of the stator body, sufficient internal space is formed between the motor end cover and the stator assembly for internal circulation.

[0010] In a further solution, a mounting groove is constructed at the center of the sinking groove, and an axial channel communicating with the mounting groove is constructed at the center of the stator assembly; the internal circulation fan is arranged in the mounting groove, and the central axis of the outer rotor assembly passes through the stator assembly and is connected to the internal circulation fan.

[0011] In a more preferred solution, a protective plate is provided on the lower end surface of the motor end cover, and ventilation holes penetrating the two end surfaces are constructed on the plate body of the protective plate. The solution here is to consider that an internal circulation fan is provided between the stator assembly and the motor end cover, in order to avoid interfering with the rotation of the internal circulation fan, or to avoid cutting or entanglement of the wires when the internal circulation fan rotates, a protective plate is provided on the lower end surface of the motor end cover, thereby solving the above-mentioned problems.

[0012] In a specific solution, the central area on one side of the protective plate faces the internal circulation fan, and the connector and its wiring harness are fixedly connected to the protective plate next to the central area. The protective plate next to the central area is provided with a mounting seat and a plurality of wire slots; the connector is fixedly connected to the mounting seat, and the wiring harness of the connector is fixed by the wire slot. An arc-shaped wire baffle is constructed on the protective plate on the other side of the central area to prevent non-fixed wiring harnesses from entering the central area. The arc-shaped wire baffle can prevent peripheral non-fixed wiring harnesses from entering the rotation trajectory of the fan. With this solution, since an internal circulation cooling fan is installed, the connection wiring harness between the electronic controller component and the stator assembly needs to avoid interference with the rotating fan, so the wiring method is optimized.

[0013] Finally, the protective plate is constructed as a porous ventilation plate, and ventilation holes are arranged on the porous ventilation plate for gas circulation. When the protective plate is between the stator assembly and the motor end cover, a gap is left between the edge of the protective plate and the edge of the motor end cover and the edge of the stator assembly, and the gap is used for air reflux, thereby realizing internal circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the three-dimensional structure of the outer rotor motor involved in the invention.

[0015] Figure 2 The present invention is an exploded view of the structure of the outer rotor motor involved in the invention.

[0016] Figure 3 It is a schematic diagram of the structure of the outer rotor assembly.

[0017] Figure 4 This is a schematic diagram of the end face of the stator assembly.

[0018] Figure 5 Schematic diagram of the assembly of the stator assembly and the motor end cover Figure 1 .

[0019] Figure 6 It is a structural schematic diagram of the internal circulation fan.

[0020] Figure 7 It is a schematic diagram of the structure of the protective plate.

[0021] Figure 8 Schematic diagram of the assembly of the stator assembly and the motor end cover Figure 2 .

[0022] Fig. 9 This is a schematic diagram of the inner circulation of the outer rotor motor involved in the invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] like Figures 1 to 9 As shown, this embodiment relates to an internal circulation structure on an outer rotor motor, including a stator assembly 1, an outer rotor assembly 2, and a motor end cover 3 with an electronic controller element built in. The outer rotor assembly 2 includes an outer rotor housing 21. The stator assembly 1 is installed in the outer rotor housing 21, and the motor end cover 3 is connected and fixed to the stator assembly 1. An internal circulation fan 4 is arranged between the stator assembly 1 and the motor end cover 3, and a central shaft 22 linked to the outer rotor housing 21 is arranged at the center of the outer rotor housing 21. After the stator assembly 1 is installed in the outer rotor housing 21, the central shaft 22 passes through the stator assembly 1 and is connected to the internal circulation fan 4. The stator assembly 1 in this structure is installed in the outer rotor housing 21, and the motor end cover 3 is connected and fixed to the stator assembly 1. During operation, the outer rotor assembly 2 rotates at a high speed relative to the stator assembly 1 and the motor end cover 3. On this basis, this solution is provided with an internal circulation fan 4 between the stator assembly 1 and the motor end cover 3, and the central axis 22 at the center of the outer rotor housing 21 can pass through the stator assembly 1 and connect to the internal circulation fan 4. Therefore, when the outer rotor assembly 2 rotates at high speed, it will drive the internal circulation fan 4 to rotate, and when the internal circulation fan 4 rotates, it can promote the air flow in the stator assembly 1, the motor end cover 3 and the space between the two to achieve internal circulation. In this way, the heat distribution inside the motor end cover 3, the stator assembly 1 and other structures can be uniform, which is conducive to fully utilizing the heat dissipation of the motor end cover 3 and improving the heat dissipation effect.

[0029] In a further solution, the stator assembly 1 is sealed at the edge with the motor end cover 3, and the internal circulation fan 4 drives the internal airflow circulation when it rotates. The sealed edge connection between the stator assembly 1 and the motor end cover 3 is conducive to improving the protection ability of the motor and meeting the high protection level requirements. The motor end cover 3 is equipped with an electric controller component, which is potted with a high heat dissipation coefficient potting glue. After the electric controller component is potted, the surface heat dissipation coefficient is 1W / mk, which is 50 times that of air 0.0244W / mk. Compared with the traditional non-potting and non-enhanced air cooling structure, the heat dissipation capacity of the controller is greatly improved. In addition, after the electric controller component is potted, the protection ability of the electric controller component is also improved, which can adapt to more complex high temperature and high humidity working conditions. The material of the high heat dissipation coefficient potting glue mainly includes fillers with high thermal conductivity. The thermal conductivity of the thermal conductive potting glue is mainly improved by the internal high thermal conductivity filler [powder], while the thermal conductivity of the base material [such as silica gel] of the potting glue itself is relatively low. Traditional high thermal conductivity materials usually include metals, metal oxides, metal nitrides and some other non-metallic materials [such as graphite, diamond]. However, in addition to the thermal conductivity requirements, thermal conductive potting glue usually also needs to have good electrical insulation properties, and cost is also a factor that needs to be considered. Therefore, the most common fillers in practical applications are metal oxides and metal nitrides, such as aluminum oxide, zinc oxide, aluminum nitride, boron nitride, silicon carbide, silica lime, etc.

[0030] In a specific embodiment, the stator assembly 1 includes a stator body 11 extending into the outer rotor housing 21, and a flange ring 12 located on the outer side of the outer rotor housing 21. A sinking groove 13 is constructed on the stator body 11 facing the motor end cover 3, and the motor end cover 3 is fixed to the flange ring 12 of the stator assembly 1. In this scheme, the stator body 11 in the stator assembly 1 extends into the outer rotor housing 21, and its flange ring 12 is located on the outer side of the outer rotor housing 21. Further, the motor end cover 3 is fixed to the flange ring 12 of the stator assembly 1, and by setting the sinking groove 13 on the end face of the stator body 11, sufficient internal space is formed between the motor end cover 3 and the stator assembly 1 for internal circulation. In a further scheme, the center of the sinking groove 13 is also concavely constructed with a mounting groove 14, and the center of the stator assembly 1 is constructed with an axial channel 15 that communicates with the mounting groove 14. The inner circulation fan 4 is arranged in the mounting groove 14 , and the central axis 22 of the outer rotor assembly 2 passes through the stator assembly 1 and is connected to the inner circulation fan 4 .

[0031] like Figure 7-9As shown, a protective plate 5 is provided on the lower end surface of the motor end cover 3, and a vent 51 is constructed on the plate body of the protective plate 5 that passes through the two end surfaces. The scheme here takes into account that an internal circulation fan 4 is arranged between the stator assembly 1 and the motor end cover 3. In order to avoid interfering with the rotation of the internal circulation fan 4, or to avoid cutting or winding the wires when the internal circulation fan 4 rotates, a protective plate 5 is provided on the lower end surface of the motor end cover 3, thereby solving the above-mentioned problems. In a specific scheme, the central area on one side of the protective plate 5 faces the internal circulation fan 4, and the connector and its wiring harness are fixedly connected to the protective plate 5 next to the central area. The protective plate 5 next to the central area is provided with a mounting seat 52 and a plurality of wire clamping grooves 53. The connector 6 is fixedly connected to the mounting seat 52, and the wiring harness of the connector 6 is fixed by the wire clamping groove 53. An arc-shaped wire blocking plate 54 is constructed on the protective plate 5 on the other side of the central area to prevent non-fixed wire harnesses from entering the central area. The arc-shaped wire blocking plate 54 can prevent the peripheral non-fixed wire harnesses from entering the rotation trajectory range of the fan. With this solution, since an internal circulation cooling fan is installed, the connection harness between the electronic controller element and the stator assembly 1 needs to avoid interference with the rotating fan, so the wiring method is optimized. Finally, the protective plate 5 is constructed as a porous ventilation plate, and the porous ventilation plate is provided with ventilation holes 51 for gas circulation. When the protective plate 5 is between the stator assembly 1 and the motor end cover 3, a gap 55 is left between the edge of the protective plate 5 and the edge of the motor end cover 3 and the edge of the stator assembly 1, and the gap 55 is for air reflux, thereby realizing internal circulation.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An internal circulation structure on an outer rotor motor, comprising a stator assembly (1), an outer rotor assembly (2), and a motor end cover (3) with an electronic control element built in; the outer rotor assembly (2) comprises an outer rotor housing (21); the stator assembly (1) is inserted into the outer rotor housing (21), and the motor end cover (3) is connected and fixed to the stator assembly (1); the characteristics are: An internal circulation fan (4) is arranged between the stator assembly (1) and the motor end cover (3), and a central shaft (22) linked to the internal circulation fan (4) is arranged at the center of the outer rotor housing (21); after the stator assembly (1) is installed inside the outer rotor housing (21), the central shaft (22) passes through the stator assembly (1) and is connected to the internal circulation fan (4).

2. The inner circulation structure of an outer rotor motor according to claim 1, characterized in that: The stator assembly (1) and the motor end cover (3) are connected in a sealed manner at their edges, and the internal circulation fan (4) drives internal airflow circulation when it rotates.

3. The inner circulation structure of an outer rotor motor according to claim 2, characterized in that: The motor end cover (3) has an electric controller component built in, and the electric controller component is potted with a high heat dissipation coefficient potting glue.

4. The inner circulation structure of an outer rotor motor according to claim 2, characterized in that: The stator assembly (1) comprises a stator body (11) extending into the interior of the outer rotor housing (21), and a flange ring (12) located outside the outer rotor housing (21); a sinking groove (13) is constructed on the stator body (11) on a side facing the motor end cover (3), and the motor end cover (3) is fixedly connected to the flange ring (12) of the stator assembly (1).

5. The inner circulation structure of an outer rotor motor according to claim 4, characterized in that: The center of the sinking groove (13) is also concavely formed with a mounting groove (14), and the center of the stator assembly (1) is formed with an axial path (15) communicating with the mounting groove (14).

6. The inner circulation structure of an outer rotor motor according to claim 1, characterized in that: A protective plate (5) is provided on the lower end surface of the motor end cover (3), and a vent hole (51) penetrating through both end surfaces is constructed on the plate body of the protective plate (5).

7. The inner circulation structure of an outer rotor motor according to claim 6, characterized in that: The central area of ​​one side of the protective plate (5) faces the internal circulation fan (4), the connector (6) and its wiring harness are fixedly connected to the protective plate (5) next to the central area, and the protective plate (5) on the other side of the central area is constructed with an arc-shaped wire blocking plate (54) to prevent non-fixed wiring harnesses from entering the central area.

8. The inner circulation structure of an outer rotor motor according to claim 7, characterized in that: A mounting seat (52) and a plurality of wire-holding grooves (53) are provided on the protection plate (5) next to the central area; the connector (6) is fixedly connected to the mounting seat (52), and the wiring harness of the connector (6) is fixed via the wire-holding grooves (53).

9. The inner circulation structure of an outer rotor motor according to claim 6, characterized in that: The protective plate (5) is constructed as a porous ventilation plate. When the protective plate (5) is located between the stator assembly (1) and the motor end cover (3), a gap (55) is left between the edge of the protective plate (5) and the edge of the motor end cover (3) and the edge of the stator assembly (1).

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