Heat dissipation structure of outer rotor motor

Abstract

The utility model discloses a kind of heat dissipation structures of outer rotor motor, including outer rotor motor, the outer rotor motor includes motor shell, rotor, stator and motor end cover, the rotor with the stator is sequentially arranged in the motor shell, the motor end cover with the motor shell detachable connection, still include heat conduction block, the heat conduction block is arranged between the stator with the motor end cover, and the heat conduction block with the stator forms heat dissipation gap, the heat conduction block can the heat generated by the rotor and stator is dissipated heat.This application is combined by the "conduction heat dissipation" of heat conduction block and the "convection heat dissipation" of heat dissipation gap, avoid the local overheating caused by single conduction heat dissipation, especially can alleviate the heat gathering on the surface of stator, to effectively improve the heat dissipation effect of outer rotor motor.

Description

Technical Field

[0001] This utility model relates to electric motors, and more particularly to a heat dissipation structure for an external rotor motor. Background Technology

[0002] External rotor motors, due to their structure where the rotor is mounted outside the stator, are widely used in electric vehicles and other fields. During operation, the stator windings and rotor generate a large amount of heat due to electromagnetic induction and friction. The stator, as the core heat-generating component, tends to accumulate heat inside the motor (especially in the enclosed space between the stator and the motor end cover). Currently, external rotor motors mostly rely on natural heat dissipation from the motor casing or the addition of simple heat sinks to the casing surface for cooling. However, this method has low heat dissipation efficiency and therefore needs improvement. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies, such as low heat dissipation efficiency of external rotor motors, by providing a new heat dissipation structure for external rotor motors.

[0004] To solve the above-mentioned technical problems, this utility model achieves this through the following technical solution: A heat dissipation structure for an external rotor motor includes an external rotor motor, which comprises a motor housing, a rotor, a stator, and a motor end cover. The rotor and the stator are sequentially disposed within the motor housing, and the motor end cover is detachably connected to the motor housing. The structure also includes a heat-conducting block disposed between the stator and the motor end cover, forming a heat dissipation gap between the heat-conducting block and the stator. The heat-conducting block can dissipate the heat generated by the rotor and the stator.

[0005] This application combines the "conductive heat dissipation" of the heat-conducting block with the "convection heat dissipation" of the heat dissipation gap to avoid local overheating caused by single conductive heat dissipation, and can especially alleviate the heat accumulation on the stator surface, thereby effectively improving the heat dissipation effect of the external rotor motor.

[0006] Preferably, in the heat dissipation structure of the external rotor motor described above, the heat-conducting block includes a first heat dissipation area, which is an annular stepped structure. A first heat dissipation groove is provided in the first heat dissipation area, and the first heat dissipation area is in close contact with the stator.

[0007] The first heat dissipation zone adopts a "ring-shaped" design to match the ring-shaped shape of the stator, while the "stepped" structure can be adapted to the end face of the stator to achieve a large-area fit between the two, maximizing the efficiency of heat transfer from the stator to the heat conduction block.

[0008] Preferably, in the heat dissipation structure of the external rotor motor described above, the heat-conducting block is further provided with a second heat dissipation area, the second heat dissipation area including at least two heat dissipation ribs, and a second heat dissipation groove is formed between adjacent heat dissipation ribs.

[0009] The heat dissipation fins have a "raised" structure, which can significantly improve the heat dissipation capacity of the heat conduction block to the end cover and the external environment, making it especially suitable for high-power motors in high-heat scenarios.

[0010] Preferably, in the heat dissipation structure of the external rotor motor described above, the height of the first heat dissipation area is higher than that of the second heat dissipation area, and after the first heat dissipation area is attached to the stator, the heat dissipation gap is formed between the second heat dissipation area and the stator.

[0011] The height difference between the first and second heat dissipation areas naturally creates a heat dissipation gap between the second heat dissipation area and the stator, thereby reducing the number of processing steps and parts required for the heat-conducting block and lowering production costs.

[0012] Preferably, in the heat dissipation structure of the external rotor motor described above, a heat accumulation area is formed between the first heat dissipation area and the second heat dissipation area.

[0013] The heat accumulation area can "converge" the heat conducted from the stator to the first heat dissipation area, preventing the heat from spreading disorderly inside the motor and directing the heat to the first and second heat dissipation areas, thereby improving heat dissipation efficiency.

[0014] Preferably, in the heat dissipation structure of the external rotor motor described above, the heat-conducting block is made of a material with fast thermal conductivity.

[0015] The present invention has the following advantages through the above structural improvements: Compared with conventional external rotor motors, this application has the advantage of high heat dissipation efficiency. By directly attaching the heat-conducting block to the core heat-generating area between the stator and the end cover, the heat transfer distance of the stator is significantly shortened compared to relying solely on the motor casing for heat dissipation. This achieves a short-path conduction from "stator heat → heat-conducting block → end cover → environment", thereby effectively improving the heat dissipation efficiency of the external rotor motor. Furthermore, by combining the "conductive heat dissipation" of the heat-conducting block with the "convective heat dissipation" of the heat dissipation gap, local overheating caused by single conductive heat dissipation is avoided, especially alleviating heat accumulation on the stator surface. Attached Figure Description

[0016] Figure 1 This is an exploded structural diagram of the external rotor motor of this utility model; Figure 2 This is a longitudinal section diagram of the external rotor motor of this utility model; Figure 3 This is a three-dimensional structural diagram of the heat-conducting block of this utility model.

[0017] Reference numerals: 1. External rotor motor; 11. Motor housing; 12. Rotor; 13. Stator; 14. Motor end cover; 2. Heat-conducting block; 21. First heat dissipation area; 211. First heat dissipation groove; 22. Second heat dissipation area; 221. Heat dissipation fin; 222. Second heat dissipation groove; 3. Heat dissipation gap; 4. Heat accumulation zone. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-3 The present invention will be further described in detail with reference to specific embodiments, but these are not intended to limit the present invention: Example

[0019] like Figure 1 , Figure 2 , Figure 3 As shown, a heat dissipation structure for an external rotor motor includes an external rotor motor 1. The external rotor motor 1 includes a motor housing 11, a rotor 12, a stator 13, and a motor end cover 14. The rotor 12 and the stator 13 are sequentially disposed within the motor housing 11. The motor end cover 14 is detachably connected to the motor housing 11. The structure also includes a heat-conducting block 2, which is disposed between the stator 13 and the motor end cover 14, and a heat dissipation gap 3 is formed between the heat-conducting block 2 and the stator 13. The heat-conducting block 2 can dissipate the heat generated by the rotor 12 and the stator 13.

[0020] Preferably, the heat-conducting block 2 includes a first heat dissipation area 21, which has an annular stepped structure. A first heat dissipation groove 211 is provided in the first heat dissipation area 21, and the first heat dissipation area 21 is in close contact with the stator 13.

[0021] Furthermore, the setting of the first heat dissipation groove 211 increases the surface area of ​​the first heat dissipation area 21 ("groove sidewall extended heat dissipation area"), which on the one hand accelerates the dissipation of heat inside the heat conduction block 2 to the external environment, and on the other hand guides the air in the heat dissipation gap 3 to flow along the groove to form directional convection, further improving the heat dissipation effect. In this embodiment, the first heat sink 211 is filled with thermal adhesive during use.

[0022] Preferably, the heat-conducting block 2 is further provided with a second heat dissipation area 22, the second heat dissipation area 22 includes at least two heat dissipation ribs 221, and a second heat dissipation groove 222 is formed between adjacent heat dissipation ribs 221.

[0023] Furthermore, the second heat dissipation groove 222 formed by the adjacent heat dissipation fins 221 can construct multiple independent air flow channels, making it easier for cold air near the motor end cover 14 to enter the heat dissipation gap 3, and hot air to be quickly discharged along the groove, avoiding the heat dissipation bottleneck caused by poor air flow in a single gap. In this embodiment, the second heat sink 222 is filled with thermal adhesive during use.

[0024] Preferably, the height of the first heat dissipation area 21 is higher than that of the second heat dissipation area 22. After the first heat dissipation area 21 is attached to the stator 13, the heat dissipation gap 3 is formed between the second heat dissipation area 22 and the stator 13.

[0025] Furthermore, the height difference between the first heat dissipation area 21 and the second heat dissipation area 22 can work in conjunction with the second heat dissipation groove 222 of the second heat dissipation area 22 to allow air to circulate in an orderly manner along the "second heat dissipation groove 222 → gap → first heat dissipation groove 211", thereby effectively improving the heat dissipation effect.

[0026] Preferably, a heat accumulation area 4 is formed between the first heat dissipation area 21 and the second heat dissipation area 22.

[0027] Furthermore, the recessed space of the heat accumulation area 4 can form a "negative pressure zone", which guides the cold air in the heat dissipation gap 3 to flow preferentially to the area where the heat is most concentrated, while the hot air is quickly discharged along the first heat dissipation groove 211 or the second heat dissipation groove 222, forming an orderly cycle of "cold air in → hot air out", avoiding local hot air stagnation.

[0028] Preferably, the heat-conducting block 2 is made of a material with fast thermal conductivity.

[0029] Furthermore, the heat-conducting block 2 is made of materials such as aluminum.

[0030] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A heat dissipation structure for an external rotor motor, comprising an external rotor motor (1), wherein the external rotor motor (1) includes a motor housing (11), a rotor (12), a stator (13), and a motor end cover (14), wherein the rotor (12) and the stator (13) are sequentially disposed within the motor housing (11), and the motor end cover (14) is detachably connected to the motor housing (11), characterized in that: It also includes a heat-conducting block (2), which is disposed between the stator (13) and the motor end cover (14), and a heat dissipation gap (3) is formed between the heat-conducting block (2) and the stator (13). The heat-conducting block (2) can dissipate the heat generated by the rotor (12) and the stator (13).

2. The heat dissipation structure of an external rotor motor according to claim 1, characterized in that: The heat-conducting block (2) includes a first heat dissipation area (21), which is an annular stepped structure. A first heat dissipation groove (211) is provided in the first heat dissipation area (21), and the first heat dissipation area (21) is in close contact with the stator (13).

3. The heat dissipation structure of an external rotor motor according to claim 2, characterized in that: The heat-conducting block (2) is also provided with a second heat dissipation area (22), the second heat dissipation area (22) includes at least two heat dissipation ribs (221), and a second heat dissipation groove (222) is formed between adjacent heat dissipation ribs (221).

4. The heat dissipation structure of an external rotor motor according to claim 3, characterized in that: The height of the first heat dissipation area (21) is higher than that of the second heat dissipation area (22). After the first heat dissipation area (21) is attached to the stator (13), the heat dissipation gap (3) is formed between the second heat dissipation area (22) and the stator (13).

5. The heat dissipation structure of an external rotor motor according to claim 4, characterized in that: A heat accumulation area (4) is formed between the first heat dissipation area (21) and the second heat dissipation area (22).

6. The heat dissipation structure of an external rotor motor according to claim 5, characterized in that: The heat-conducting block (2) is made of a material with fast thermal conductivity.

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