Heat dissipation structure of external rotor motor

Abstract

The utility model relates to the technical field of heat dissipation of external rotor motors, and particularly discloses an external rotor motor heat dissipation structure which comprises a motor shell, a motor flange is fixedly connected to the front end of the motor shell, a first bearing is fixedly connected to the front end of the interior of the motor shell, a motor stator is fixedly connected to the interior of the motor shell, and a second bearing is fixedly connected to the rear end of the motor shell. A stator heat dissipation disc is fixedly connected to the rear end of the motor stator, second bearings are fixedly connected to the front portion and the rear portion of the motor stator, a third bearing is fixedly connected between the stator heat dissipation disc and the motor shaft, and the motor shaft is jointly and fixedly connected to the interiors of the first bearing, the second bearings and the third bearing; the motor rotor is fixedly connected to the outside of the motor shaft, and when the rotor body rotates, the blades stir air to flow and enable air to flow axially, so that heat on the rotor body and the heat dissipation disc is taken away, the heat dissipation effect of the motor is improved, and the efficiency of the heat dissipation structure of the motor is improved.

Description

Technical Field

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

[0002] An external rotor motor is a type of electric motor characterized by having the rotor on the outside and the stator inside. This design gives external rotor motors advantages such as simple structure, small axial dimensions, and high power-to-weight ratio. Compared with traditional internal rotor motors, external rotor motors have advantages in highly integrated applications, such as electric vehicles, drones, and robots.

[0003] External rotor motors have a wide range of applications, including fans, pumps, centrifuges, and some power tools. In these applications, external rotor motors are widely used because of their excellent heat dissipation performance and low noise. For example, in industrial and domestic environments, external rotor motors are used in air conditioning and ventilation systems, providing high-efficiency and low-noise operation.

[0004] In existing technical solutions, the external rotor motor operates at a high temperature during long-term operation, thus requiring heat dissipation. The common method of heat dissipation is to cool the motor from the outside. However, external heat dissipation components not only affect the weight and shape of the motor, but also have low heat dissipation efficiency and cannot stabilize the internal temperature of the motor.

[0005] Therefore, a heat dissipation structure for an external rotor motor is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a heat dissipation structure for an external rotor motor, which, when the rotor body rotates, the blades agitate the airflow, causing the gas to flow axially, thereby carrying away the heat from the rotor body and the heat sink, thus improving the heat dissipation effect of the motor and increasing the efficiency of the motor heat dissipation structure, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an external rotor motor heat dissipation structure, comprising a motor housing, a motor flange fixedly connected to the front end of the motor housing, a first bearing fixedly connected to the front end of the inner part of the motor housing, a motor stator fixedly connected to the inner part of the motor housing, a stator heat sink fixedly connected to the rear end of the motor stator, second bearings fixedly connected to the front and rear of the motor stator, a third bearing fixedly connected between the stator heat sink and the motor shaft, a motor shaft fixedly connected inside the first, second, and third bearings, a motor rotor fixedly connected to the outside of the motor shaft, and rotor blades fixedly connected to the front end of the motor rotor.

[0008] Preferably, a strip magnetic block is fixedly connected to the inner wall of the rotor housing, and there are multiple strip magnetic blocks and heat dissipation blades.

[0009] Preferably, a rotor housing is fixedly connected to the outside of the motor rotor, heat dissipation blades are fixedly connected to the outside of the rotor housing, and heat dissipation holes are provided at the front end of the rotor housing.

[0010] Preferably, there are multiple heat dissipation blades and heat dissipation holes, and all of the multiple heat dissipation blades are inclined in the same direction.

[0011] Preferably, the stator heat sink is externally fixedly connected with heat dissipation fins and heat dissipation blocks, the heat dissipation blocks are provided with a first positioning groove on the outside, and the front end of the stator heat sink is fixedly connected with an extended hollow shaft.

[0012] Preferably, there are multiple heat dissipation fins, heat dissipation blocks, and first positioning grooves, and the stator heat dissipation plate is slidably attached to the inside of the motor housing.

[0013] Preferably, a motor rear cover is fixedly connected to the rear end of the motor housing, a connecting block is fixedly connected to the front end of the motor rear cover, and a fixing block is fixedly connected to the rear end of the motor rear cover.

[0014] Preferably, the motor rear cover has mounting holes inside and filter mesh holes on the outside.

[0015] Preferably, a motor filter is movably connected to the rear end of the motor rear cover. The motor filter has a mesh plate and a second positioning groove on its outer side. The mesh plate is located above the second positioning groove. A switch positioning hole is provided on the outer side of the motor filter. The number of switch positioning holes is multiple.

[0016] Preferably, the connecting block is slidably fitted inside the first positioning groove, and the motor shaft is slidably fitted inside the extended hollow shaft.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This external rotor motor heat dissipation structure, by installing components such as motor housing, motor flange, motor stator, motor shaft, and motor rotor, enables the blades to agitate the airflow when the rotor body rotates, causing the gas to flow axially, thereby carrying away the heat from the rotor body and the heat dissipation plate, thus improving the heat dissipation effect of the motor and increasing the efficiency of the motor heat dissipation structure.

[0019] 2. This external rotor motor heat dissipation structure optimizes the airflow direction by installing components such as rotor blades, rotor housing, heat dissipation blades, heat dissipation holes and strip magnetic blocks. At the same time, the motor housing and rotor blades form a directional air duct, allowing air to be discharged from the filter screen through the air outlet on the motor housing, providing all-round heat dissipation for the motor's stator, rotor and bearings.

[0020] 3. This external rotor motor heat dissipation structure, by installing components such as stator heat dissipation plate, heat dissipation fins, heat dissipation block, first positioning groove and extended hollow shaft, can ensure the cleanliness of the motor interior and reduce air intake resistance. At the same time, filter cotton is installed in the filter screen to prevent dust and hair from entering. The stator heat dissipation plate is tightly attached to the motor housing and fixed with screws, which enhances the heat dissipation effect.

[0021] 4. This external rotor motor heat dissipation structure, by installing components such as the motor rear cover, connecting block, fixing block, mounting hole, filter mesh and motor filter, can make adjacent heat dissipation fins and the inner wall of the motor housing form a vertical air duct, increasing airflow and further improving heat dissipation efficiency. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is an overall structural view of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal half-section structure of the motor housing of the present invention;

[0025] Figure 3 This is a schematic diagram of the rotor housing of the present invention;

[0026] Figure 4 This is a top view of the rotor housing of the present invention;

[0027] Figure 5 This is a schematic diagram of the stator heat sink structure of the present invention;

[0028] Figure 6 This is a top view of the stator heat sink of the present invention;

[0029] Figure 7 This is a schematic diagram of the motor rear cover structure of the present invention;

[0030] Figure 8 This is a top view of the motor rear cover of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the mesh plate of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Motor housing; 11. Motor flange; 2. First bearing; 21. Second bearing; 22. Third bearing; 3. Motor stator; 31. Motor shaft; 32. Motor rotor; 321. Rotor blades; 33. Rotor housing; 331. Heat dissipation blades; 332. Heat dissipation holes; 34. Strip magnet; 4. Stator heat dissipation plate; 41. Heat dissipation fins; 42. Heat dissipation block; 43. First positioning groove; 44. Extended hollow shaft; 5. Motor rear cover; 51. Connecting block; 52. Fixing clip; 53. Mounting hole; 54. Filter mesh; 6. Motor filter; 61. Mesh plate; 62. Second positioning groove; 63. Switch positioning hole. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1 to 4 The present invention provides a technical solution:

[0036] An external rotor motor heat dissipation structure includes a motor housing 1, a motor flange 11 fixedly connected to the front end of the motor housing 1, a first bearing 2 fixedly connected to the front end of the inner part of the motor housing 1, a motor stator 3 fixedly connected to the inner part of the motor housing 1, a stator heat sink 4 fixedly connected to the rear end of the motor stator 3, a second bearing 21 fixedly connected to the front and rear of the motor stator 3, a third bearing 22 fixedly connected between the stator heat sink 4 and the motor shaft 31, the first bearing 2, the second bearing 21 and the third bearing 22 being internally fixedly connected to the motor shaft 31, a motor rotor 32 fixedly connected to the outside of the motor shaft 31, rotor blades 321 fixedly connected to the front end of the motor rotor 32, and strip magnetic blocks 34 fixedly connected to the inner wall of the rotor housing 33. The number of strip magnetic blocks 34 and heat dissipation blades 331 are both multiple.

[0037] By adopting the above technical solution, when the motor needs to work, it is powered on by connecting the motor. The wires are connected to the motor rotor 32 through the second positioning groove 62 inside the motor filter 6. When current flows through the wires inside the motor stator 3, a magnetic field is generated around it. This magnetic field can interact with the multiple bar magnets 34 inside the motor rotor 32, thereby generating a force. This force will cause the motor rotor 32 to rotate. The rotation of the motor rotor 32 causes the motor shaft 31 between the second bearing 21 and the third bearing 22 to rotate within the first bearing 2 inside the motor flange 11. As the motor rotor 32 rotates continuously, it also causes the rotor blades 321 at the front end to rotate. The continuous rotation of the rotor blades 321 will agitate the air flow inside the motor housing 1, causing the gas to flow axially through the heat dissipation holes 332, thereby carrying away the heat generated by the rotation of the motor rotor 32, thus improving the heat dissipation effect of the motor and increasing the efficiency of the motor heat dissipation structure.

[0038] Specifically, such as Figure 4 As shown, a rotor housing 33 is fixedly connected to the outside of the motor rotor 32, and heat dissipation blades 331 are fixedly connected to the outside of the rotor housing 33. A heat dissipation hole 332 is opened at the front end of the rotor housing 33. There are multiple heat dissipation blades 331 and heat dissipation holes 332, and all the multiple heat dissipation blades 331 are inclined in the same direction.

[0039] By adopting the above technical solution, during the operation of the motor, the rotor 32 rotates along with the external rotor housing 33, and the rotor housing 33 rotates along with the external heat dissipation blades 331. As the heat dissipation blades 331 rotate continuously, gas is generated and flows along the outside of the heat dissipation blades 331, thereby optimizing the airflow direction. At the same time, the rotor housing 33 and the rotor blades 321 form a directional air duct, allowing air to be discharged from the stator heat dissipation plate 4, providing all-round heat dissipation for the motor shaft 31 and the motor rotor 32.

[0040] Specifically, such as Figure 4 As shown, the stator heat sink 4 is externally fixedly connected with heat dissipation ribs 41 and heat dissipation blocks 42. The heat dissipation blocks 42 are externally provided with a first positioning groove 43. The front end of the stator heat sink 4 is fixedly connected with an extended hollow shaft 44. There are multiple heat dissipation ribs 41, heat dissipation blocks 42 and first positioning grooves 43. The stator heat sink 4 is slidably attached to the inside of the motor housing 1. The connecting block 51 is slidably attached to the inside of the first positioning groove 43. The motor shaft 31 is slidably attached to the inside of the extended hollow shaft 44.

[0041] By adopting the above technical solution, during the operation of the motor, as the motor shaft 31 rotates continuously, the heat generated by the rotation is transferred to the stator heat sink 4 through the extended hollow shaft 44, and then dissipated through the heat dissipation fins 41 and the heat sink 42. When it is necessary to install or remove the motor rear cover 5, the connecting block 51 is slid into the first positioning groove 43 to ensure the cleanliness of the motor housing 1 and reduce the air intake resistance. At the same time, filter cotton can be installed in the filter screen to prevent dust and hair from entering. The motor rear cover 5 is tightly fitted to the stator heat sink 4 and fixed with screws, which enhances the heat dissipation effect.

[0042] Specifically, such as Figure 4 As shown, a motor rear cover 5 is fixedly connected to the rear end of the motor housing 1, a connecting block 51 is fixedly connected to the front end of the motor rear cover 5, a fixing block 52 is fixedly connected to the rear end of the motor rear cover 5, an installation hole 53 is provided inside the motor rear cover 5, a filter screen hole 54 is provided outside the motor rear cover 5, a motor filter 6 is movably connected to the rear end of the motor rear cover 5, a mesh plate 61 and a second positioning groove 62 are provided outside the motor filter 6, the mesh plate 61 is located above the second positioning groove 62, and a switch positioning hole 63 is provided outside the motor filter 6, and the number of switch positioning holes 63 is multiple.

[0043] By adopting the above technical solution, when the motor is working, the motor shaft 31 rotates, causing the motor rotor 32 and the external rotor housing 33 to rotate together. As the rotor housing 33 rotates, the external heat dissipation blades 331 also rotate, thereby stirring the gas inside the motor housing 1 for heat dissipation. The dissipated gas is discharged along the heat dissipation blades 331 and then dissipates heat through the filter mesh 54 inside the motor rear cover 5. The motor filter 6 is positioned and installed by the fixing block 52, the mounting hole 53, the filter mesh 54 and the mesh plate 61. Finally, the filter is filtered through the switch positioning hole 63 on the outside of the motor filter 6. This allows the adjacent heat dissipation fins 41 and the inner wall of the motor housing 1 to form a vertical air duct, increasing the airflow and further improving the heat dissipation efficiency.

[0044] Working principle: When the motor needs to work, it is powered on by connecting the motor. The wires are connected to the motor rotor 32 through the second positioning groove 62 inside the motor filter 6. When current flows through the wires inside the motor stator 3, a magnetic field is generated around it. This magnetic field interacts with the multiple bar magnets 34 inside the motor rotor 32, thereby generating a force. This force causes the motor rotor 32 to rotate. The rotation of the motor rotor 32 drives the motor shaft 31 to rotate within the first bearing 2 inside the motor flange 11. As the motor rotor 32 rotates continuously, it also drives the rotor blades 321 at the front end to rotate. The continuous rotation of the rotor blades 321 stirs the motor. The airflow inside the motor housing 1 causes gas to flow axially through the heat dissipation holes 332, thereby carrying away the heat generated by the rotation of the motor rotor 32 and improving the motor's heat dissipation effect. During motor operation, the rotation of the motor rotor 32 causes the external rotor housing 33 to rotate together, and the rotation of the rotor housing 33 causes the external heat dissipation blades 331 to rotate. As the heat dissipation blades 331 rotate continuously, gas flows along the outside of the heat dissipation blades 331, optimizing the airflow direction. At the same time, the rotor housing 33 and the rotor blades 321 form a directional airflow channel, allowing air to be discharged from the stator heat sink 4, thus providing heat for the motor. The motor shaft 31 and motor rotor 32 provide all-around heat dissipation. As the motor shaft 31 rotates continuously, the heat generated by the rotation is transferred to the stator heat sink 4 through the extended hollow shaft 44, and then dissipated through the heat dissipation fins 41 and heat sink 42. When it is necessary to install or remove the motor rear cover 5, the connecting block 51 is slid into the first positioning groove 43 to ensure the cleanliness of the motor housing 1 and reduce the air intake resistance. At the same time, filter cotton can be installed in the filter screen to prevent dust and hair from entering. The motor rear cover 5 fits tightly with the stator heat sink 4 and is fixed with screws, which enhances the heat dissipation effect. The rotation of the motor shaft 31 carries... The motor rotor 32 and the external rotor housing 33 rotate together. As the rotor housing 33 rotates, the external heat dissipation blades 331 also rotate, thereby stirring the gas inside the motor housing 1 to dissipate heat. The dissipated gas is discharged along the heat dissipation blades 331 and then dissipates heat through the filter mesh 54 inside the motor rear cover 5. The motor filter 6 is positioned and installed through the mounting hole 53, the filter mesh 54 and the mesh plate 61. Finally, the filter is filtered through the switch positioning hole 63 on the outside of the motor filter 6. This allows the adjacent heat dissipation fins 41 and the inner wall of the motor housing 1 to form a vertical air duct, increasing the airflow and further improving the heat dissipation efficiency.

Claims

1. A heat dissipation structure of an outer rotor motor, comprising a motor housing (1), characterized in that: The front end of the motor shell (1) is fixedly connected with a motor flange (11), the inner front end of the motor shell (1) is fixedly connected with a first bearing (2), the inside of the motor shell (1) is fixedly connected with a motor stator (3), the rear end of the motor stator (3) is fixedly connected with a stator heat dissipation disc (4), the front and rear of the motor stator (3) are fixedly connected with a second bearing (21), the stator heat dissipation disc (4) and a motor shaft (31) are fixedly connected with a third bearing (22), the inside of the first bearing (2), the second bearing (21) and the third bearing (22) are fixedly connected with the motor shaft (31) in common, the outside of the motor shaft (31) is fixedly connected with a motor rotor (32), and the front end of the motor rotor (32) is fixedly connected with a rotor blade (321). The outside of the motor rotor (32) is fixedly connected with a rotor shell (33), the outside of the rotor shell (33) is fixedly connected with a heat dissipation blade (331), and the front end of the rotor shell (33) is provided with a heat dissipation hole (332).

2. A heat sink structure for an outer rotor electric machine according to claim 1, characterized in that: The inner wall of the rotor shell (33) is fixedly connected with a strip-shaped magnetic block (34), and the number of the strip-shaped magnetic block (34) and the heat dissipation blade (331) is multiple.

3. The heat dissipation structure of an outer rotor motor according to claim 1, characterized in that: The number of the heat dissipation blade (331) and the heat dissipation hole (332) is multiple, and multiple heat dissipation blades (331) are inclined to the same direction.

4. A heat sink structure for an outer rotor electric machine according to claim 3, characterized in that: The outside of the stator heat dissipation disc (4) is fixedly connected with a heat dissipation rib (41) and a heat dissipation block (42), the outside of the heat dissipation block (42) is provided with a first positioning groove (43), and the front end of the stator heat dissipation disc (4) is fixedly connected with an extended hollow shaft (44).

5. A heat sink structure for an outer rotor electric machine according to claim 4, characterized in that: The number of the heat dissipation rib (41), the heat dissipation block (42) and the first positioning groove (43) is multiple, and the stator heat dissipation disc (4) is slidably attached to the inside of the motor shell (1).

6. A heat sink structure for an outer rotor electric machine according to claim 4, characterized by: The rear end of the motor shell (1) is fixedly connected with a motor rear cover (5), the front end of the motor rear cover (5) is fixedly connected with a connecting block (51), and the rear end of the motor rear cover (5) is fixedly connected with a fixed clamping block (52).

7. A heat sink structure for an outer rotor electric machine according to claim 6, characterized in that: The inside of the motor rear cover (5) is provided with a mounting hole (53), and the outside of the motor rear cover (5) is provided with a filter mesh hole (54).

8. A heat sink structure for an outer rotor electric machine according to claim 6, characterized by: The rear end of the motor rear cover (5) is movably connected with a motor filter screen (6), the outside of the motor filter screen (6) is provided with a mesh plate (61) and a second positioning groove (62), the mesh plate (61) is located above the second positioning groove (62), the outside of the motor filter screen (6) is provided with a switch positioning hole (63), and the number of the switch positioning hole (63) is multiple.

9. A heat sink structure for an outer rotor electric machine according to claim 6, characterized by: The connecting block (51) is slidably attached to the inside of the first positioning groove (43), and the motor shaft (31) is slidably attached to the inside of the extended hollow shaft (44).

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