A brushless motor with efficient heat dissipation

Abstract

This invention relates to the field of motor technology, specifically disclosing a brushless motor with high-efficiency heat dissipation. The motor includes a hollow cylindrical motor housing. A front cover and a rear cover are fixedly installed on the front and rear sides of the motor housing, and a power supply harness is welded to the outside of the rear cover. An output shaft, penetrating the front cover, is disposed inside the motor housing, and its rear end is coaxially fixed to a rotor assembly. The rotor assembly corresponds to a stator assembly fixedly installed on the inner wall of the motor housing. A cooling fan is fixedly installed at the rear end of the rotor assembly, and heat dissipation holes are formed inside the front and rear covers. During operation, the rotor assembly drives the output shaft to rotate, simultaneously driving the cooling fan. The cooling fan, in conjunction with the heat dissipation holes, forms an airflow channel, thereby achieving heat dissipation for the motor. Furthermore, heat dissipation fins on the outer surface of the motor housing enhance heat transfer, resulting in even better heat dissipation.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a brushless motor with efficient heat dissipation. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy and vice versa. It is mainly based on the law of electromagnetic induction. A brushless motor is an improved form of a traditional motor. Traditional motors require brushes, while brushless motors are DC motors that do not require physical brushes and commutators. Commutation is achieved through an electronic controller, and they are characterized by high efficiency, long life and low maintenance.

[0003] In the prior art, Chinese patent application number CN201711471127.1 discloses a brushless motor, including an insulating frame body and three phase copper terminals. The insulating frame body includes an insulating inner ring and insulating extension arms arranged on the insulating inner ring and spaced apart circumferentially along the insulating inner ring. A winding space is formed between adjacent insulating extension arms. Three protrusions are provided on the same end face of the insulating inner ring. The three protrusions are arranged spaced apart circumferentially along the insulating inner ring. The protrusion direction of each protrusion is along the central axis of the insulating inner ring. Each phase copper terminal is inserted into the corresponding protrusion, and part of each phase copper terminal is exposed outside the protrusion for electrical connection with the controller of the brushless motor. The insulating frame body and the phase copper terminals are fixed together. During installation, the phase copper terminals will not fall off the insulating frame body. The installation operation is convenient and reliable, improving installation efficiency.

[0004] For example, in the prior art, Chinese patent application number CN202111539620.9 discloses a brushless motor, including a housing, a stator assembly, a rotor assembly, and a first heat-conducting element. The stator assembly is located inside and connected to the housing, and the rotor assembly cooperates with the stator assembly. The rotor assembly is rotatably connected to the housing, and at least a portion of the rotor assembly is located inside the housing. The first heat-conducting element is connected to both the housing and the stator assembly and is used to transfer the heat generated by the stator assembly to the outside. The first heat-conducting element absorbs the heat generated by the stator assembly during operation and transfers the absorbed heat to the housing. Finally, the housing transfers the heat to the external environment. By transferring the heat inside the motor to the outside through the first heat-conducting element and the housing, the heat accumulation inside the motor is avoided.

[0005] For example, in the prior art, Chinese Patent Application No. CN201810019541.7 discloses a brushless motor, including a stator support and a heat sink. The stator support includes a support portion for supporting the stator of the brushless motor, and heat transfer portions are respectively provided at both ends of the support portion. One end of the heat transfer portion extends out of the housing of the brushless motor and is connected to the heat sink, which can transfer the heat of the stator of the brushless motor to the heat sink. Since one end of the heat transfer portion extends out of the housing of the brushless motor and is connected to the heat sink, the heat of the stator can be transferred from the heat transfer portion to the heat sink located outside the housing, and the heat sink dissipates the heat to the outside of the housing. This can transfer the heat inside the housing to the outside of the housing, and can effectively dissipate heat from the stator inside the housing.

[0006] Based on the above information, it can be seen that in the prior art, motors need to perform heat dissipation during operation. However, in actual use, the prior art generally uses airflow to achieve heat dissipation. The heat dissipation effect of airflow is greatly affected by changes in ambient temperature. When the ambient temperature is high, the overall heat dissipation effect will decrease. Summary of the Invention

[0007] The purpose of this invention is to provide a brushless motor with efficient heat dissipation, so as to solve the problem of limited heat dissipation effect mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a brushless motor with efficient heat dissipation, comprising a motor housing with a hollow cylindrical structure, a front cover plate and a rear cover plate fixedly installed on the front and rear sides of the motor housing, and a power supply harness fixedly welded to the outside of the rear cover plate; an output shaft penetrating the front cover plate is provided inside the motor housing, and the rear end of the output shaft is coaxially fixed to a rotor assembly; the rotor assembly corresponds to a stator assembly fixedly installed on the inner wall of the motor housing; a cooling fan is fixedly installed at the rear end of the rotor assembly, and heat dissipation holes are opened inside the front and rear cover plates; heat dissipation fins are fixedly installed on the outer surface of the motor housing; a connecting base is fixedly installed on the outer surface of the lower surface of the motor housing, and a receiving groove is opened inside the connecting base, and a cooling mechanism for enhancing heat dissipation is provided inside the receiving groove; a fixing plate for fixing the motor is installed on the lower surface of the connecting base, and a shock-absorbing mechanism is provided between the fixing plate and the connecting base; a mounting bracket is provided on the inner surface of the front cover plate, and drying cotton is installed inside the mounting bracket.

[0009] Preferably, the cooling mechanism includes a semiconductor cooling chip fixedly installed inside the receiving groove, wherein the upper surface of the semiconductor cooling chip cools and the lower surface heats, thereby achieving the purpose of cooling the air using the semiconductor cooling chip.

[0010] Preferably, the connecting base has air inlet holes on its front and rear sides that communicate with the receiving groove, and the positions of the connecting holes of the connecting base correspond to each other. The connecting holes are evenly distributed on the lower surface of the motor housing. Air in the receiving groove can enter the motor housing through the connecting holes.

[0011] Preferably, a baffle plate for extending the air retention time is fixedly installed inside the receiving groove, and the baffle plates are distributed in an alternating manner to extend the air retention time inside the receiving groove.

[0012] Preferably, the shock absorption mechanism includes a shock absorption spring and a damper fixedly installed between the connecting base and the fixed plate, and an air-filled bladder is also fixedly installed between the connecting base and the fixed plate, so as to achieve the purpose of shock absorption when the motor is running by using the shock absorption spring in conjunction with the damper.

[0013] Preferably, a copper tube is inserted and connected inside the filling airbag, and the connecting copper tube is configured with a bent structure. A heat spreader is fixedly installed on the upper surface of the connecting copper tube, and the upper surface of the heat spreader is close to the lower surface of the semiconductor cooling chip.

[0014] Preferably, the mounting frame is divided into an outer frame and an inner frame with a ring structure, and the drying cotton is fixedly installed with the inner frame. The drying cotton and the outer frame form a sliding structure, which uses the drying cotton to dry the air that enters the motor housing and prevents moisture from entering and damaging the motor.

[0015] Preferably, the outer frame is fixedly installed on the inner surface of the front cover plate using a fixing clip, and the drying cotton has uniformly opened through holes inside.

[0016] Preferably, the outer frame has a storage tank inside for storing filtered water, and the storage tank is connected to the edge of the drying cotton.

[0017] Preferably, two transmission rollers are rotatably mounted on the inner surface of the front cover plate, and the outer side of the transmission rollers rubs against the inner surface of the inner frame, the inner side of the transmission rollers rubs against the friction block, and the friction block is fixedly mounted on the outside of the output shaft.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the brushless motor with high heat dissipation adopts a novel structural design, the specific details of which are as follows:

[0019] 1. During operation, the rotor assembly drives the output shaft to rotate, which in turn drives the cooling fan to rotate. The cooling fan, together with the heat dissipation holes, forms an air duct to dissipate heat from the motor. At the same time, the outer surface of the motor housing is equipped with heat dissipation fins, which can improve heat transfer and achieve better heat dissipation.

[0020] Furthermore, when air flows inside the motor housing, a pressure difference is created between it and the outside. Under the action of pressure, the outside air enters the receiving groove inside the connecting base through the air inlet. At this time, the semiconductor cooling chip inside the receiving groove is used to cool the air (by using staggered baffles to increase the residence time of the air inside the receiving groove). The cooled air enters the motor housing through the connecting hole, thereby improving the heat dissipation effect inside the motor and achieving effective heat dissipation even when the external ambient temperature is high.

[0021] Furthermore, a fixing plate is installed below the connecting base (the fixing plate is used to fix the motor in the equipment). A shock-absorbing spring and a damper are installed between the connecting base and the fixing plate. The shock-absorbing spring and the damper work together to reduce the vibration of the motor and improve the stability of motor operation. When the semiconductor heat sink is working, heat accumulates on the lower surface. The heat is transferred to the helium in the filling air bag through the heat dissipation plate and the connecting copper pipe. The helium expands under the action of heat, thereby using the elastic effect of the filling air bag in conjunction with the damper to achieve a better damping effect.

[0022] 2. A mounting bracket is fixed to the inner surface of the front cover using a fixing clip. Drying cotton is installed inside the mounting bracket. The position of the drying cotton corresponds to the position of the heat dissipation hole. When air enters the motor housing through the heat dissipation hole, it first passes through the drying cotton, which absorbs the moisture in the air, thereby preventing moisture from entering the motor housing and causing damage.

[0023] Furthermore, the mounting frame is divided into an outer frame and an inner frame. During the rotation of the output shaft, the friction block fixedly mounted on its exterior rotates synchronously. At this time, the friction of the friction block drives the transmission roller to rotate. Under the transmission action of the transmission roller, the inner frame is driven, which in turn drives the drying cotton to rotate. At this time, under the action of centrifugal force, the water adsorbed in the drying cotton is discharged into the storage tank, ensuring the subsequent water absorption effect of the drying cotton. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the motor housing of the present invention;

[0026] Figure 3 This is a schematic diagram of the cooling fan structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the internal structure of the connecting base of the present invention;

[0028] Figure 5 This is a schematic diagram of the upper surface structure of the fixing plate of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

[0030] Figure 7 This is a schematic diagram showing the positional relationship between the semiconductor cooling chip and the heat spreader of the present invention;

[0031] Figure 8 This is a schematic diagram of the inner structure of the front cover plate of the present invention;

[0032] Figure 9 This is a schematic diagram of the structure of the drying cotton of the present invention;

[0033] Figure 10 This is a schematic diagram of the internal structure of the outer frame of the present invention.

[0034] In the diagram: 1. Motor housing; 2. Front cover; 3. Rear cover; 4. Power supply harness; 5. Output shaft; 6. Rotor assembly; 7. Stator assembly; 8. Cooling fan; 9. Heat dissipation holes; 10. Heat dissipation fins; 11. Connecting base; 12. Receiving slot; 13. Semiconductor cooling chip; 14. Air inlet; 15. Connecting hole; 16. Baffle plate; 17. Fixing plate; 18. Shock-absorbing spring; 19. Damper; 20. Filler airbag; 21. Connecting copper pipe; 22. Heat spreader plate; 23. Mounting bracket; 2301. Outer frame; 2302. Inner frame; 24. Fixing clip; 25. Drying cotton; 26. Through hole; 27. Transmission roller; 28. Friction block; 29. ​​Storage slot. Detailed Implementation

[0035] 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.

[0036] Example 1: Please refer to Figures 1-5To enhance motor heat dissipation, this embodiment provides the following technical solution: a hollow cylindrical motor housing 1; a front cover plate 2 and a rear cover plate 3 fixedly installed on the front and rear sides of the motor housing 1; a power supply harness 4 fixedly welded to the outside of the rear cover plate 3; an output shaft 5 penetrating the front cover plate 2 inside the motor housing 1; and a rotor assembly 6 coaxially fixed at its rear end. The rotor assembly 6 corresponds to a stator assembly 7 fixedly installed on the inner wall of the motor housing 1. A cooling fan 8 is fixedly installed at the rear end of the rotor assembly 6; heat dissipation holes 9 are opened inside the front cover plate 2 and the rear cover plate 3; and heat dissipation fins 10 are fixedly installed on the outer surface of the motor housing 1. A connecting base 11 is fixedly installed on the lower surface of the outer casing 1, and a receiving groove 12 is opened inside the connecting base 11. A cooling mechanism to enhance heat dissipation is provided inside the receiving groove 12. The cooling mechanism includes a semiconductor cooling chip 13 fixedly installed inside the receiving groove 12. The upper surface of the semiconductor cooling chip 13 cools and the lower surface heats. Air inlet holes 14 communicating with the receiving groove 12 are opened on the front and rear sides of the connecting base 11. The positions of the connecting holes 15 of the connecting base 11 are corresponding to each other. The connecting holes 15 are evenly opened on the lower surface of the motor casing 1. A baffle plate 16 for extending the air retention time is fixedly installed inside the receiving groove 12. The baffle plates 16 are distributed in an alternating manner.

[0037] First, the motor is installed in its operating position using the fixing plate 17 and bolts. Then, the power supply harness 4 is connected. Under the principle of electromagnetic induction, the rotor assembly 6 rotates, driving the output shaft 5 to rotate, thereby driving the load. During this process, the rotor assembly 6 drives the cooling fan 8 on its rear side to rotate synchronously. The rotation of the cooling fan 8 causes airflow, allowing external air to enter through the heat dissipation holes 9 of the front cover plate 2 and exit through the heat dissipation holes 9 of the rear cover plate 3, achieving the purpose of cooling the inside of the motor housing 1. Simultaneously, the heat dissipation fins 10 on the outside of the motor housing 1 can improve the heat conduction speed, further enhancing the heat dissipation effect. When the internal air flows, a pressure difference is formed with the outside. Under the action of pressure, the outside air is drawn into the receiving groove 12 inside the connecting base 11 through the air inlet 14. At this time, the semiconductor cooling chip 13 inside the receiving groove 12 is turned on to cool the air entering the receiving groove 12 (the residence time of the air inside the receiving groove 12 is increased under the blocking effect of the baffle plate 16, thereby improving the cooling effect of the air). The cooled air enters the motor housing 1 through the connecting hole 15 and mixes with the normal air, improving the heat dissipation effect inside the motor housing 1, so that a good heat dissipation effect can still be achieved when the outside temperature is high.

[0038] Example 2: Please refer to Figures 6-7In order to achieve the purpose of vibration reduction during motor operation, this embodiment provides the following technical solution, specifically: a fixing plate 17 for fixing the motor is installed on the lower surface of the connecting base 11, and a vibration damping mechanism is provided between the fixing plate 17 and the connecting base 11; the vibration damping mechanism includes a vibration damping spring 18 and a damper 19 fixedly installed between the connecting base 11 and the fixing plate 17, and a filling airbag 20 is also fixedly installed between the connecting base 11 and the fixing plate 17. A copper tube 21 is inserted and connected inside the filling airbag 20, and the connecting copper tube 21 is set as a bent structure. A heat dissipation plate 22 is fixedly installed on the upper surface of the connecting copper tube 21, and the upper surface of the heat dissipation plate 22 is close to the lower surface of the semiconductor cooling chip 13.

[0039] When the motor vibrates during operation, the shock-absorbing spring 18 between the connecting base 11 and the fixed plate 17 absorbs the vibration force, and works with the damper 19 to achieve the purpose of shock absorption. At the same time, the heat dissipation plate 22 is in contact with the lower surface of the thermoelectric cooler 13 (the thermoelectric cooler 13 cools and heats at the same time during operation, with the upper surface cooling and the lower surface heating). The heat is transferred to the filling airbag 20 through the heat dissipation plate 22 and the connecting copper pipe 21 in contact with the heat dissipation plate 22, causing the helium gas in the filling airbag 20 to expand. Under the filling effect of the helium gas, the filling airbag 20 maintains its support and elasticity, thereby achieving a better shock absorption effect in conjunction with the shock-absorbing spring 18 and the damper 19.

[0040] Example 3: Please refer to Figures 8-10 In order to achieve the purpose of drying the heat dissipation air, this embodiment provides the following technical solution, specifically: a mounting bracket 23 is provided on the inner surface of the front cover plate 2, and a drying cotton 25 is installed on the inner side of the mounting bracket 23. The mounting bracket 23 is divided into an outer frame 2301 and an inner frame 2302 with an annular structure. The drying cotton 25 is fixedly installed with the inner frame 2302, and a sliding structure is formed between the drying cotton 25 and the outer frame 2301. The outer frame 2301 is fixedly installed on the inner surface of the front cover plate 2 by a fixing clip 24. Through holes 26 are evenly opened inside the drying cotton 25. A storage tank 29 for storing filtered water is opened inside the outer frame 2301, and the storage tank 29 is connected to the edge of the drying cotton 25. Two transmission rollers 27 are rotatably installed on the inner surface of the front cover plate 2. The outer side of the transmission rollers 27 is in contact with the inner surface of the inner frame 2302 and rubs against the inner side of the transmission rollers 27. The friction block 28 is fixedly installed outside the output shaft 5.

[0041] During the motor cooling process, air enters the motor housing 1 through the heat dissipation holes 9 in the front cover 2. At this time, the air passes through the drying cotton 25 inside the mounting bracket 23, which absorbs the moisture in the air, thus preventing moisture from entering the motor and causing damage. When the output shaft 5 rotates, it drives the friction block 28 fixedly mounted on its outside to rotate synchronously. The friction force of the friction block 28 drives the transmission roller 27 to rotate. During the rotation, the transmission roller 27 drives the inner frame 2302 to rotate, which in turn drives the drying cotton 25 to rotate. The centrifugal force of the rotating drying cotton 25 discharges the water adsorbed inside and collects it in the storage tank 29, ensuring the subsequent drying effect of the drying cotton 25.

[0042] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An efficient heat dissipation brushless motor, comprising a hollow cylindrical motor housing (1), the motor housing (1) is fixedly installed with front cover plate (2) and rear cover plate (3) on both sides, and the outside of the rear cover plate (3) is fixedly welded with power supply wire harness (4), characterized in that: the inside of the motor housing (1) is provided with an output shaft (5) penetrating through the front cover plate (2), and the rear end of the output shaft (5) is coaxially fixed with a rotor assembly (6), the rotor assembly (6) corresponds to a stator assembly (7) fixedly installed on the inner wall of the motor housing (1); the rear end of the rotor assembly (6) is fixedly installed with a cooling fan (8), the inside of the front cover plate (2) and the rear cover plate (3) is provided with a cooling hole (9), and the outer surface of the motor housing (1) is fixedly installed with a cooling fin (10), the lower surface of the motor housing (1) is fixedly installed with a connecting base (11), the inside of the connecting base (11) is provided with a containing groove (12), and the inside of the containing groove (12) is provided with a refrigeration mechanism for enhancing the cooling effect; the inside of the containing groove (12) is fixedly installed with a shielding plate (16) for prolonging the air retention time, the shielding plate (16) is staggered, the damping mechanism comprises a damping spring (18) and a damper (19) fixedly installed between the connecting base (11) and a fixed plate (17), and a filled air bag (20) is also fixedly installed between the connecting base (11) and the fixed plate (17), the inside of the filled air bag (20) is filled with helium, a copper pipe (21) is inserted into the inside of the filled air bag (20), the connecting copper pipe (21) is arranged in a bent structure, a heat evenly plate (22) is fixedly installed on the upper surface of the connecting copper pipe (21), and the upper surface of the heat evenly plate (22) is close to the lower surface of a semiconductor refrigeration piece (13); the lower surface of the connecting base (11) is installed with a fixed plate (17) for fixing the motor, and the fixed plate (17) and the connecting base (11) are provided with a damping mechanism; the inside surface of the front cover plate (2) is provided with a mounting frame (23), and the inside of the mounting frame (23) is installed with dry cotton (25).

2. The brushless motor of claim 1, wherein: The refrigeration mechanism comprises a semiconductor refrigeration piece (13) fixedly installed in the containing groove (12), and the upper surface of the semiconductor refrigeration piece (13) is refrigerated and the lower surface is heated.

3. The brushless motor of claim 2, wherein: The front and rear sides of the connecting base (11) are provided with air inlet holes (14) communicating with the containing groove (12), the positions of the communicating holes (15) of the connecting base (11) correspond to each other, and the communicating holes (15) are evenly arranged on the lower surface of the motor housing (1).

4. The brushless motor of claim 1, wherein: The mounting frame (23) is divided into an outer frame body (2301) and an inner frame body (2302) in a ring structure, the dry cotton (25) is fixedly installed with the inner frame body (2302), and a sliding structure is formed between the dry cotton (25) and the outer frame body (2301).

5. The brushless motor of claim 4, wherein: The outer frame body (2301) is fixedly installed on the inside surface of the front cover plate (2) by a fixed clamp (24), and the inside of the dry cotton (25) is evenly provided with a penetrating hole (26).

6. The brushless motor of claim 5, wherein: The outer frame (2301) is internally provided with a storage groove (29) for storing filtered water, and the storage groove (29) and the edge position of the dry cotton (25) are in communication with each other.

7. The brushless motor of claim 6, wherein: Two transmission rollers (27) are rotationally installed on the inner side surface of the front cover plate (2), the outer side of the transmission roller (27) is in frictional engagement with the inner side surface of the inner frame (2302), the inner side of the transmission roller (27) is in frictional engagement with the friction block (28), and the friction block (28) is fixedly installed on the outer side of the output shaft (5).

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