Heat dissipation structure for external rotor motor and motor

Abstract

The utility model discloses a heat dissipation structure for an external rotor motor and a motor, and relates to the technical field of external rotor motors, the heat dissipation structure comprises a rear end cover and a wind scooper, the wind scooper is wrapped outside a fan of the external rotor motor, a gap is arranged between the wind scooper and the rear end cover to form an air channel for air circulation, and the air channel is communicated with the rear end cover. The air duct guides air to a fan of the outer rotor motor and discharges the air; the air circulation area and path length are optimized, and the heat dissipation effect of the motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of external rotor motor technology, and in particular to a heat dissipation structure and motor for an external rotor motor. Background Technology

[0002] Currently, as external rotor motors increase in power, they also generate more heat, causing electronic components to operate at high temperatures and making them prone to damage and malfunctions. Therefore, most external rotor motors are equipped with fans to drive airflow and accelerate heat dissipation. However, the heat dissipation structure design of existing external rotor motors is not reasonable enough, resulting in poor heat dissipation performance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a heat dissipation structure for an external rotor motor, optimizing the airflow area and path length to improve the motor's heat dissipation effect.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A heat dissipation structure for an external rotor motor includes: a rear end cover and an air guide shroud, the air guide shroud covering the fan of the external rotor motor, and a gap between the air guide shroud and the rear end cover forming an air duct for air circulation, the air duct guiding air to the fan of the external rotor motor and exhausting it.

[0006] Compared with the prior art, the present invention has the following beneficial effects:

[0007] The fan is placed inside the air guide shroud, forming an air duct between the shroud and the rear end cover. The fan's rotation draws cool air into the air duct, thereby carrying away the heat transferred from the coils of the external rotor motor to the rear end cover. This design optimizes the airflow area and path length, improving the motor's heat dissipation.

[0008] As a preferred embodiment, the middle portions of both the rear end cover and the air guide shroud extend into the cavity of the stator of the external rotor motor.

[0009] As a preferred embodiment, the air guide shroud is provided with an air inlet and an air outlet. The air guide shroud includes a front cover and a rear cover that are detachably connected. The fan of the external rotor motor is located inside the front cover and the rear cover. The middle part of the front cover is open and connected to the fan of the external rotor motor.

[0010] As a preferred embodiment, the air inlets are provided at least two and distributed on different sides of the fan of the external rotor motor.

[0011] In view of the shortcomings of the existing technology, this utility model also provides a motor that optimizes the air circulation area and path length to improve the heat dissipation effect of the motor.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] An electric motor includes: a front cover, a shaft, a stator, a rotor, and a heat dissipation structure for an external rotor motor, wherein one end of the shaft is rotatably connected to the front cover and the rear cover, and a fan is connected to that end of the shaft, and the stator and the rotor are disposed on the shaft from the inside to the outside.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The fan is placed inside the air guide shroud, forming an air duct between the shroud and the rear end cover. The fan's rotation draws cool air into the air duct, thereby removing the heat transferred from the external rotor motor to the rear end cover. Optimizing the airflow area and path length improves the motor's heat dissipation.

[0016] As a preferred embodiment, the system further includes a controller unit installed on the front end cover and / or the rear end cover. The controller unit is provided with a cooling channel, and the two ends of the cooling channel are respectively connected to the outlet air of the air guide shroud and the outside.

[0017] As a preferred embodiment, an internal fan rotatably connected within the front cover is also included.

[0018] As a preferred embodiment, the inner ring of the stator is provided with a silicon steel sheet, and at least a portion of the rear end cover is attached to the silicon steel sheet.

[0019] As a preferred embodiment, the stator housing is made of aluminum. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of the external rotor motor in the embodiment;

[0021] Figure 2 for Figure 1 Exploded view.

[0022] In the above attached figures:

[0023] 1. Front cover; 2. Rear cover; 201. First annular protrusion; 202. Second annular protrusion; 3. Shaft; 4. Stator; 5. Rotor; 6. Fan; 7. Air guide shroud; 701. Front cover; 7011. Third annular protrusion; 702. Rear cover; 8. Bearing housing; 9. Air inlet; 10. Air outlet; 11. Silicon steel sheet; 12. Controller unit; 121. Housing; 122. Controller assembly; 123. Bracket; 13. Internal fan. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments; the structures described in various embodiments can be freely combined without conflict in terms of structure or principle.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are 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, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] This utility model proposes a heat dissipation structure for an external rotor motor. For ease of understanding, the heat dissipation structure for an external rotor motor will be described in conjunction with the external rotor motor itself. Specifically, as follows... Figure 1As shown, the external rotor motor includes a front cover 1, a rear cover 2, a shaft 3, a stator 4, a rotor 5, a fan 6, and an air guide shroud 7. The front cover 1 and the rear cover 2 are detachably connected together by bolts or other fasteners. The right end of the shaft 3 is rotatably connected to the front cover 1 and the rear cover 2 via a bearing seat 8, and the right end of the shaft 3 is connected to the fan 6 via a keyway, thus driving the fan 6 to rotate. The stator 4 is fitted outside the shaft 3, and the rotor 5 is fitted outside the stator 4. The specific structure and connection method of the stator 4 and the rotor 5 are existing technologies and will not be described in detail here. The air guide shroud 7 covers the fan 6. Specifically, for ease of installation and manufacturing, the air guide shroud 7 includes a front cover 701 and a rear cover 702, which are detachably connected by bolts or other fasteners. The front cover 701 has an air inlet 9, and the rear cover 702 has an air outlet 10. A gap is provided between the air guide shroud 7 and the rear end cover 2 to form an air duct for air circulation. The air duct guides air sequentially to the inner cavity of the stator 4, the fan 6, and finally exhausts it. The flow path of the cold air in the air duct is as follows: Figure 1 As indicated by the middle arrow.

[0028] In this design, fan 6 is placed inside air guide shroud 7, forming an air duct between air guide shroud 7 and rear end cover 2. Rotation of shaft 3 drives fan 6 to rotate, drawing cool air into the air duct and thus removing the heat transferred from the coils of the external rotor motor to the rear end cover 2. This design optimizes the airflow area and path length, improving the motor's heat dissipation effect.

[0029] As a preferred option, such as Figure 1 and Figure 2 As shown, a ring of silicon steel sheets 11 is fixed to the inner ring of the stator 4, and at least a portion of the rear end cover 2 is in contact with the silicon steel sheets 11. For example, a first annular protrusion 201 protruding to the left is provided in the middle of the rear end cover 2. The first annular protrusion 201 extends to the inner ring of the stator 4 (i.e., the cavity of the stator 4) and is in contact with the inner ring of the silicon steel sheets 11. By optimizing the airflow path, the contact area between the rear end cover 2 and the silicon steel sheets 11 is increased. The heat generated by the motor coils is quickly transferred to the rear end cover 2 through the silicon steel sheets 11. Part of the heat from the rear end cover 2 is radiated to the outside, and the remaining heat is carried away by the cool air in the airflow duct, greatly enhancing the heat dissipation effect of the external rotor motor.

[0030] Furthermore, a second annular protrusion 202 protruding to the right is provided in the middle of the rear end cover 2. The rotating shaft 3 passes through the second annular protrusion 202 and is connected to the second annular protrusion 202 through the bearing seat 8. The first annular protrusion 201 and the second annular protrusion 202 extend the air duct path (first bending horizontally to the left, then bending vertically, and finally bending horizontally to the right), increasing the contact area between the cold air and the rear end cover 2 and enhancing heat dissipation. In addition, the second annular protrusion 202 provides a mounting point for the rotating shaft 3.

[0031] Furthermore, a third annular protrusion 7011, protruding to the left, is provided in the middle of the front cover 701. The middle of the third annular protrusion 7011 is open and communicates with the inner cavity of the rear cover 702, serving to connect the fan 6. The third annular protrusion 7011 is fitted over the second annular protrusion 202. Gaps are left between the third annular protrusion 7011 and the first annular protrusion 201 and the second annular protrusion 202, forming part of the air duct. In this way, the airflow path is extended, heat dissipation is enhanced, and the structure is compact.

[0032] As a preferred embodiment, at least two air inlets 9 are provided and distributed on different sides of the fan 6. For example, such as... Figure 1 and Figure 2 As shown, the left end of the front cover 701 covers the right side of the rear cover 2 with a gap between them, forming an annular air inlet 9. In this way, cold air can enter the air duct from the annular side of the front cover 701, increasing the air intake and enhancing the heat dissipation effect.

[0033] As a preferred embodiment, it also includes a controller unit 12 installed on the front cover 1 and / or the rear cover 2. The controller unit 12 is provided with a cooling channel, and the two ends of the cooling channel are respectively connected to the outlet air 10 of the air guide shroud 7 and the outside. For example, as shown in the figure... Figure 1 and Figure 2 As shown, the controller unit 12 includes a housing 121, a controller assembly 122, and a bracket 123. The controller assembly 122 itself is an existing PCB controller, which is installed inside the housing 121. The housing 121 is mounted on the front cover 1 and the rear cover 2 via the bracket 123. The bracket 123 has a through hole and faces the air outlet 10 of the air guide 7. A horizontally extending gap is left between the bracket 123 and the housing 121 for air circulation.

[0034] In this way, the rotation of the shaft 3 drives the fan 6 to rotate, thereby drawing in cooling air from the air inlet 9. The cold air flows through the silicon steel sheet 11 inside the stator 4 along the gap between the rear end cover 2 and the front cover 701, and then passes through the fan 6, the air outlet 10, the bracket 123 and the gap between the front end cover 1 and the rear end cover 2 in sequence, thereby carrying away the heat generated by the external rotor motor and the controller unit 12 during operation, achieving good heat dissipation and a compact structure.

[0035] As a preferred embodiment, an internal fan 13 is also provided on the rotating shaft 3, and the internal fan 13 is located inside the front cover 1. The rotation of the rotating shaft 3 drives the internal fan 13 to rotate, which enhances the circulation of hot air in the external rotor motor, allowing the hot air to radiate heat to the outside through the shell of the front cover 1 and the rear cover 2, thereby enhancing heat dissipation.

[0036] Furthermore, the outer casing 121 of the stator 4 is made of aluminum, which facilitates the heat radiation to the outside or the transfer to the cold air in the air duct.

Claims

1. A heat dissipating structure for an outer rotor motor, characterized by, include: The rear end cover (2) and the air guide cover (7) are provided. The air guide cover (7) covers the fan (6) of the outer rotor motor. There is a gap between the air guide cover (7) and the rear end cover (2) to form an air duct for air circulation. The air duct guides the air to the fan (6) of the outer rotor motor and discharges it.

2. A heat dissipation structure for an outer rotor motor according to claim 1, characterized in that, The middle portions of the rear end cover (2) and the air guide shroud (7) both extend into the cavity of the stator (4) of the external rotor motor.

3. A heat dissipation structure for an outer rotor motor according to claim 1 or 2, characterized in that, The air guide shroud (7) is provided with an air inlet (9) and an air outlet (10). The air guide shroud (7) includes a front cover (701) and a rear cover (702) that are detachably connected. The fan (6) of the external rotor motor is located inside the front cover (701) and the rear cover (702). The front cover (701) is open in the middle and communicates with the fan (6) of the external rotor motor.

4. A heat dissipating structure for an outer rotor motor according to claim 3, wherein The air inlet (9) is provided in at least two locations and is distributed on different sides of the fan (6) of the external rotor motor.

5. An electric motor, characterized in that, The device includes a front cover (1), a rotating shaft (3), a stator (4), a rotor (5), and a heat dissipation structure for an external rotor motor as described in any one of claims 1-4. One end of the rotating shaft (3) is rotatably connected to the front cover (1) and the rear cover (2), and a fan (6) is connected to that end of the rotating shaft (3). The stator (4) and the rotor (5) are mounted on the rotating shaft (3) from the inside out.

6. An electric machine according to claim 5, characterised in that It also includes a controller unit (12) installed on the front cover (1) and / or the rear cover (2), the controller unit (12) having a cooling channel, the two ends of the cooling channel being connected to the outlet air of the air guide shroud (7) and the outside world respectively.

7. An electrical machine according to claim 5 or 6, characterised in that, It also includes an internal fan (13) that is rotatably connected inside the front cover (1).

8. An electric machine according to claim 7, characterised in that The inner ring of the stator (4) is provided with a silicon steel sheet (11), and at least a portion of the rear end cover (2) is attached to the silicon steel sheet (11).

9. An electric machine according to claim 8, characterised in that The outer shell of the stator (4) is made of aluminum.

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