A structure for realizing internal heat dissipation of an outer rotor motor

Abstract

The application relates to a structure for realizing internal heat dissipation of an outer rotor motor, which comprises a motor rotor, a motor stator, a bearing seat and an end cover, the end cover is sleeved on the bearing seat, the motor rotor is sleeved on the motor stator, the motor stator is sleeved on the bearing seat, a protective cover is arranged between the motor rotor and the end cover, the protective cover is connected with the motor rotor, and heat dissipation ribs for motor rotation heat dissipation are arranged in the protective cover. The protective cover is connected with the motor rotor, a layer of "barrier" with a heat dissipation function is added outside the rotor, direct influence of the external environment on the motor interior can be blocked, the heat of the rotor itself and the heat transferred from the stator can be concentrated and conducted out through the heat dissipation ribs, meanwhile, the motor stator is sleeved on the bearing seat, the heat can also be indirectly conducted through the bearing seat, the airflow effect of the heat dissipation ribs is matched, a composite heat dissipation path of "conduction + convection" is formed, and the heat dissipation efficiency is improved.

Description

Technical Field

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

[0002] Currently, external rotor motors are widely used in various power equipment due to their compact structure and high torque density. However, since the external rotor of an external rotor motor is directly exposed, heat dissipation has always been a key factor restricting its performance improvement.

[0003] In existing technologies, traditional external rotor motors mainly rely on natural convection and radiation for heat dissipation, which has low heat dissipation efficiency. Especially under high temperature or high load conditions, the motor temperature rises too quickly, which can lead to problems such as demagnetization of the magnets and aging of the insulation, seriously affecting the reliability and service life of the motor.

[0004] Regarding the aforementioned technologies, existing heat dissipation solutions generally suffer from low heat dissipation efficiency, complex structure, and high cost, making it difficult to meet the heat dissipation requirements of high power density external rotor motors. Utility Model Content

[0005] To address the problems of low internal heat dissipation efficiency, complex structure, and high cost of external rotor motors, this application provides a structure for achieving internal heat dissipation in external rotor motors.

[0006] This application provides a structure for achieving internal heat dissipation in an external rotor motor, employing the following technical solution: The structure for internal heat dissipation of an external rotor motor includes a motor rotor, a motor stator, a bearing housing, and an end cover. The end cover is fitted onto the bearing housing, the motor rotor is fitted onto the motor stator, and the motor stator is fitted onto the bearing housing. A protective cover is provided between the motor rotor and the end cover. The protective cover is connected to the motor rotor. The interior of the protective cover is provided with heat dissipation fins for heat dissipation during motor rotation, and the heat dissipation fins rotate with the protective cover.

[0007] By adopting the above technical solution, the protective cover is connected to the motor rotor, which is equivalent to adding a "barrier" with heat dissipation function to the outside of the rotor. It can not only block the direct impact of the external environment on the inside of the motor (such as dust and water vapor), but also concentrate and dissipate the heat of the rotor itself and the heat transferred from the stator through the heat dissipation fins. At the same time, the motor stator is mounted on the bearing housing, and the heat can also be indirectly conducted through the bearing housing. Combined with the airflow effect of the heat dissipation fins, a composite heat dissipation path of "conduction + convection" is formed, which improves the heat dissipation efficiency.

[0008] Preferably, there are several heat dissipation fins, which are evenly distributed on the inner wall of the protective cover.

[0009] By adopting the above technical solution, the evenly distributed heat dissipation fins can create a more balanced disturbance to the air inside the motor when the protective cover rotates. Each heat dissipation fin can be regarded as an "airflow stirring unit". Several evenly distributed heat dissipation fins can push the airflow from different angles and positions to ensure that the air around the stator winding, iron core, rotor and other components can be fully driven, reducing the heat accumulation caused by insufficient local airflow.

[0010] Preferably, a skeleton seal is provided between the protective cover and the end cap, the skeleton seal is connected to the bearing seat, and the skeleton seal is rotatably connected to the protective cover.

[0011] By adopting the above technical solution, the relatively enclosed space formed by the skeleton seal allows the airflow driven by the heat dissipation fins to circulate more concentratedly inside the motor, reducing the meaningless diffusion of heat to the outside. At the same time, the protective cover directs the heat to the external environment, achieving the effect of "sealing without blocking heat".

[0012] Preferably, the end cap is provided with a waterproof connector for wire connection on the side away from the protective cover.

[0013] By adopting the above technical solution, the waterproof connector can waterproof the connection between the motor rotor and the wires, enabling it to operate stably in rainy or humid environments.

[0014] Preferably, the connection between the end cap and the bearing housing is a detachable connection.

[0015] By adopting the above technical solution, when the motor fails, the detachable end cover can be quickly opened to directly observe the status of internal components such as the stator, rotor, heat dissipation fins, and frame seals, which facilitates accurate location of the fault point, avoids blindly disassembling other structures, and improves the efficiency of fault diagnosis.

[0016] Preferably, the protective cover has mounting holes for installation, and the protective cover is connected and fixed to the motor rotor through the mounting holes and screws.

[0017] By adopting the above technical solution, the screws are rigidly connected to the motor rotor through the mounting holes, forming a tight and stable fixing relationship, ensuring that the protective cover does not undergo relative displacement or loosening when the motor rotor rotates at high speed.

[0018] Preferably, the motor rotor includes a shaft and a housing, the shaft is connected to the housing, and the bearing housing is connected to the shaft via a bearing.

[0019] By adopting the above technical solution, the rotor usually wraps around the stator, and the shaft core serves as the rotation center of the rotor. It is connected to a fixed bearing housing through bearings, which can meet the structural requirement of high-speed rotation of the rotor housing around the stator. At the same time, the shaft core transmits torque to ensure the stability of power output.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. The protective cover connects to the motor rotor, which is equivalent to adding a heat dissipation "barrier" to the outside of the rotor. It can block the direct impact of the external environment on the inside of the motor (such as dust and water vapor), and can also concentrate and dissipate the heat of the rotor itself and the heat transferred from the stator through the heat dissipation fins. At the same time, the motor stator is mounted on the bearing housing, and the heat can also be indirectly conducted through the bearing housing. Combined with the airflow effect of the heat dissipation fins, a composite heat dissipation path of "conduction + convection" is formed to improve heat dissipation efficiency. 2. The evenly distributed heat dissipation fins can create a more balanced disturbance to the air inside the motor when the protective cover rotates. Each heat dissipation fin can be regarded as an "airflow stirring unit". Several evenly distributed heat dissipation fins can push the airflow from different angles and positions to ensure that the air around the stator winding, iron core, rotor and other components can be fully driven, reducing the heat accumulation caused by insufficient local airflow. 3. By setting up a skeleton seal, the relatively enclosed space formed by the skeleton seal allows the airflow driven by the heat dissipation fins to circulate more concentratedly inside the motor, reducing the meaningless diffusion of heat to the outside. At the same time, the protective cover directs the heat to the external environment, achieving the effect of "sealing without blocking heat". Attached Figure Description

[0021] Figure 1 This is a front view of the structure that enables internal heat dissipation in an external rotor motor; Figure 2 This is a cross-sectional view of the structure that enables internal heat dissipation in an external rotor motor; Figure 3 This is a frontal 3D view of the protective shield; Figure 4 This is a rear-view 3D view of the protective shield.

[0022] Reference numerals in the attached drawings: 1. Motor rotor; 1-1. Shaft core; 1-2. Housing; 2. Motor stator; 3. Bearing housing; 4. End cover; 5. Protective cover; 6. Heat dissipation fins; 7. Frame seal; 8. Waterproof joint; 9. Mounting hole. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail.

[0024] This application discloses a structure for achieving internal heat dissipation in an external rotor motor.

[0025] Reference Figure 1A structure for internal heat dissipation of an external rotor motor includes a motor rotor 1, a motor stator 2, a bearing housing 3, and an end cover 4. The end cover 4 is fitted onto and connected to the bearing housing 3. The motor rotor 1 is fitted onto the motor stator 2, with the end of the motor stator 2 furthest from the end cover 4 located inside the motor rotor 1. The motor stator 2 is fitted onto the surface of the bearing housing 3. A protective cover 5 is provided between the motor rotor 1 and the end cover 4, and the protective cover 5 is fixedly connected to the end of the motor rotor 1 closest to the end cover 4. Heat dissipation ribs 6 are fixedly connected to the inner wall of the protective cover 5. The heat dissipation fins 6 are used for heat dissipation of the motor stator 2 and rotor, and rotate with the protective cover 5. The protective cover 5 is connected to the motor rotor 1, which is equivalent to adding a layer of heat dissipation "barrier" on the outside of the rotor. It can not only block the direct impact of the external environment on the inside of the motor, but also concentrate and dissipate the heat of the rotor itself and the heat transferred from the stator through the heat dissipation fins 6. At the same time, the motor stator 2 is mounted on the bearing housing 3, and the heat can also be indirectly conducted through the bearing housing 3. Combined with the airflow of the heat dissipation fins 6, a composite heat dissipation path of "conduction + convection" is formed to improve the heat dissipation efficiency.

[0026] refer to Figure 2 The motor rotor 1 includes a shaft core 1-1 and a housing 1-2, wherein the shaft core 1-1 is fixedly connected to the housing 1-2, and the bearing seat 3 is rotatably connected to the shaft core 1-1 through a bearing. The rotor usually encloses the stator, and the shaft core 1-1 serves as the rotation center of the rotor. It is connected to the fixed bearing seat 3 through a bearing, which can realize the structural requirement of high-speed rotation of the rotor housing 1-2 around the stator. At the same time, the shaft core 1-1 transmits torque to ensure the stability of power output.

[0027] refer to Figure 2 The end cover 4 is provided with a waterproof connector 8 for wire connection on the side away from the protective cover 5. The waterproof connector 8 is threaded or detachably connected to the end cover 4. The waterproof connector 8 can waterproof the connection between the motor rotor 1 and the wire, so that it can operate stably in rainy or humid environments.

[0028] refer to Figure 2 and Figure 3 There are several heat dissipation fins 6, which are evenly distributed on the inner wall of the protective cover 5. The even distribution of heat dissipation fins 6 on the protective cover 5 can create a more balanced disturbance to the air inside the motor when the protective cover 5 rotates. Each heat dissipation fin 6 can be regarded as an "airflow stirring unit". Several evenly distributed heat dissipation fins 6 can push the airflow from different angles and positions to ensure that the air around the stator winding, iron core, rotor and other components can be fully driven, reducing the heat accumulation caused by insufficient local airflow.

[0029] refer to Figure 2 and Figure 3A skeleton seal 7 is provided between the protective cover 5 and the end cover 4, and the skeleton seal 7 is fixedly connected to the bearing seat 3 and rotatably connected to the protective cover 5. The relatively closed space formed by the skeleton seal 7 allows the airflow driven by the heat dissipation fins 6 to circulate more concentratedly inside the motor, reducing the meaningless diffusion of heat to the outside. At the same time, the protective cover 5 directs the heat to the external environment, achieving the effect of "sealing without blocking heat".

[0030] refer to Figure 4 The connection between the end cover 4 and the bearing housing 3 is a detachable connection, which allows the end cover 4 and the bearing housing 3 to be fixed by screws or studs. When the motor fails, the detachable end cover 4 can be quickly opened to directly observe the status of internal components such as the stator, rotor, heat dissipation fins 6, and frame seal 7, which facilitates accurate location of the fault point, avoids blindly disassembling other structures, and improves the efficiency of fault diagnosis.

[0031] refer to Figure 4 The protective cover 5 has mounting holes 9 for installation. The protective cover 5 is connected and fixed to the motor rotor 1 through the mounting holes 9 and the screws. The screws are rigidly connected to the motor rotor 1 through the mounting holes 9, which can form a tight and stable fixed relationship, ensuring that the protective cover 5 does not undergo relative displacement or loosening when the motor rotor 1 rotates at high speed.

[0032] The implementation principle of this application embodiment is as follows: In implementation, the external rotor motor starts, the motor rotor 1 rotates, the motor rotation drives the protective cover 5 to rotate, the protective cover 5 drives the heat dissipation fins 6 on the protective cover 5 to rotate, so that the heat dissipation fins 6 and the protective cover 5 form a fan-like structure, which blows between the motor stator 2 and the motor rotor 1, so that the heat dissipation fins 6 can push the airflow from different angles and positions, ensuring that the air around the stator windings, iron core, rotor and other components can be fully driven. At the same time, the heat dissipation fins 6 concentrate and dissipate the heat of the rotor itself and the heat transferred from the stator, thereby reducing the internal temperature of the external rotor motor and improving the heat dissipation efficiency.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A structure for internal heat dissipation of an external rotor motor, comprising a motor rotor (1), a motor stator (2), a bearing housing (3), and an end cover (4), characterized in that, The end cap (4) is fitted onto the bearing seat (3), the motor rotor (1) is fitted onto the motor stator (2), the motor stator (2) is fitted onto the bearing seat (3), a protective cover (5) is provided between the motor rotor (1) and the end cap (4), the protective cover (5) is connected to the motor rotor (1), and the interior of the protective cover (5) is provided with heat dissipation fins (6) for motor rotation heat dissipation, and the heat dissipation fins (6) rotate with the protective cover (5).

2. The structure for achieving internal heat dissipation of an external rotor motor according to claim 1, characterized in that, There are several heat dissipation ribs (6), and the heat dissipation ribs (6) are evenly distributed on the inner wall of the protective cover (5).

3. The structure for achieving internal heat dissipation of an external rotor motor according to claim 1, characterized in that, A skeleton seal (7) is provided between the protective cover (5) and the end cap (4). The skeleton seal (7) is connected to the bearing seat (3) and is rotatably connected to the protective cover (5).

4. The structure for achieving internal heat dissipation of an external rotor motor according to claim 1, characterized in that, The end cap (4) is provided with a waterproof connector (8) for wire connection on the side away from the protective cover (5).

5. The structure for achieving internal heat dissipation of an external rotor motor according to claim 1, characterized in that, The connection between the end cap (4) and the bearing seat (3) is a detachable connection.

6. The structure for achieving internal heat dissipation of an external rotor motor according to claim 1, characterized in that, The protective cover (5) is provided with mounting holes (9) for installing the protective cover (5). The protective cover (5) is connected and fixed to the motor rotor (1) through the mounting holes (9) and screws.

7. The structure for achieving internal heat dissipation of an external rotor motor according to claim 1, characterized in that, The motor rotor (1) includes a shaft core (1-1) and a housing (1-2). The shaft core (1-1) is connected to the housing (1-2), and the bearing seat (3) is connected to the shaft core (1-1) through a bearing.

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