Brushless motor capable of efficiently dissipating heat

Abstract

The invention relates to the technical field of motors, and particularly discloses a brushless motor capable of efficiently dissipating heat, which comprises a motor shell of a hollow cylindrical structure, a front cover plate and a rear cover plate are fixedly mounted on the front side and the rear side of the motor shell, and a power supply wire harness is fixedly welded outside the rear cover plate. An output shaft penetrating through the front cover plate is arranged in the motor shell, the rear end of the output shaft and a rotor assembly are coaxially fixed, and the rotor assembly corresponds to a stator assembly fixedly installed on the inner wall of the motor shell. A heat dissipation fan is fixedly installed at the rear end of the rotor assembly, and heat dissipation holes are formed in the front cover plate and the rear cover plate. According to the brushless motor capable of efficiently dissipating heat, in the operation process of the motor, the rotor assembly drives the output shaft to rotate and drives the heat dissipation fan to rotate at the same time, the heat dissipation fan is matched with the heat dissipation holes to form an air channel, the purpose of dissipating heat of the motor is achieved, and meanwhile heat dissipation fins are arranged on the outer surface of the motor shell, so that heat transfer can be improved; and a better heat dissipation effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a brushless motor capable of efficiently dissipating heat. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy, mainly based on the law of electromagnetic induction. A brushless motor is an improved form of 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 have the characteristics of high efficiency, long life and low maintenance.

[0003] In the prior art, a Chinese patent application numbered CN201711471127.1 discloses a brushless motor comprising an insulating skeleton body and three phase copper terminals. The insulating skeleton body comprises an insulating inner ring and insulating extension arms arranged on the insulating inner ring and spaced apart along the circumference of 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 spaced apart along the circumference of the insulating inner ring. The protruding 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 a portion of each phase copper terminal is exposed outside the protrusion for electrical connection to the controller of the brushless motor. The insulating skeleton body is fixed together with the phase copper terminals. During installation, the phase copper terminals will not fall off from the insulating skeleton body. The installation operation is convenient and reliable, thereby improving installation efficiency.

[0004] For example, in the prior art, a Chinese patent with application number CN202111539620.9 discloses a brushless motor, including a casing, a stator assembly, a rotor assembly and a first heat conductor. The stator assembly is located in the casing and connected to the casing, the rotor assembly cooperates with the stator assembly, and the rotor assembly is rotatably connected to the casing. At least part of the rotor assembly is located in the casing. The first heat conductor is respectively connected to the casing and the stator assembly, and is used to transfer the heat generated by the stator assembly to the outside world. The first heat conductor absorbs the heat generated during the operation of the stator assembly, and the first heat conductor transfers the absorbed heat to the casing. Finally, the casing transfers the heat to the external environment, and the heat inside the motor is transferred to the outside world through the first heat conductor and the casing, thereby avoiding heat accumulation inside the motor.

[0005] For example, in the prior art, a Chinese patent with application number CN201810019541.7 discloses a brushless motor, including a stator bracket and a radiator; the stator bracket includes a support portion for supporting the stator of the brushless motor, and a heat transfer portion is provided at each end of the support portion, one end of the heat transfer portion is used to extend out of the housing of the brushless motor and be connected to the radiator, so as to transfer the heat of the stator of the brushless motor to the radiator. Since one end of the heat transfer portion extends out of the housing of the brushless motor and is connected to the radiator, the heat of the stator can be transferred by the heat transfer portion to the radiator located outside the housing, and the heat is dissipated to the outside of the housing through the radiator, so that the heat inside the housing can be transferred to the outside of the housing, and the stator inside the housing can be better dissipated.

[0006] Combined with the above materials, it can be seen that in the prior art, heat dissipation operations are required when the motor is running. However, in actual use, similar to the above-mentioned prior art, air flow is generally used to achieve the purpose of heat dissipation. The heat dissipation effect of air flow is greatly affected by the changing ambient temperature. When the ambient temperature is high, the overall heat dissipation effect will be reduced. Summary of the Invention

[0007] An object of the present invention is to provide a brushless motor capable of dissipating heat efficiently, so as to solve the problem of limited heat dissipation effect mentioned in the above background technology.

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

[0009] Preferably, the refrigeration mechanism includes a semiconductor refrigeration plate fixedly installed inside the accommodating groove, and the upper surface of the semiconductor refrigeration plate cools and the lower surface heats, so that the purpose of cooling the air is achieved by using the semiconductor refrigeration plate.

[0010] Preferably, air inlet holes connected to the accommodating groove are opened on the front and rear sides of the connecting base, and the positions of the connecting holes of the connecting base correspond to each other, and the connecting holes are evenly opened on the lower surface of the motor housing so that the air in the accommodating groove can enter the interior of the motor housing through the connecting holes.

[0011] Preferably, a shielding plate for prolonging the air retention time is fixedly installed inside the accommodating tank, and the shielding plates are distributed in a staggered manner, so as to prolong the air retention time inside the accommodating tank.

[0012] Preferably, the shock absorbing mechanism includes a shock absorbing spring and a damper fixedly installed between the connecting base and the fixed plate, and a filling air bag is also fixedly installed between the connecting base and the fixed plate, and the shock absorbing spring is combined with the damper to achieve the purpose of shock absorption when the motor is running.

[0013] Preferably, a connecting copper tube is inserted into the filling airbag, and the connecting copper tube is set to a bent structure, and 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 refrigeration plate.

[0014] Preferably, the mounting frame is divided into an outer frame and an inner frame in a ring structure, and the drying cotton is fixedly installed on the inner frame, and a sliding structure is formed between the drying cotton and the outer frame. The drying cotton is used to dry the air entering the motor casing to prevent moisture from entering and damaging the motor.

[0015] Preferably, the outer frame is fixedly mounted on the inner surface of the front cover by means of a fixing clip, and through holes are evenly opened inside the drying cotton.

[0016] Preferably, a storage tank for storing filtered water is provided inside the outer frame, and the storage tank is communicated with an 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 sides of the transmission rollers rub against the inner surface of the inner frame, and the inner sides of the transmission rollers rub against the friction blocks, and the friction blocks are fixedly mounted on the outside of the output shaft.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the brushless motor with high heat dissipation efficiency adopts a new structural design, the specific contents of which are as follows: 1. During the operation of the motor, the rotor assembly drives the output shaft to rotate, and at the same time drives the cooling fan to rotate. The cooling fan and the cooling holes form an air duct to achieve the purpose of heat dissipation of the motor. At the same time, the outer surface of the motor housing is provided with cooling fins to improve heat transfer and achieve better heat dissipation effect. Furthermore, when the air flows inside the motor housing, a pressure difference is formed with the outside. Under the action of the pressure, the outside air enters the receiving groove inside the connection base through the air inlet hole. At this time, the semiconductor refrigeration plate inside the receiving groove is used to cool the air (the staggered shielding plates are used 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, so that the purpose of effective heat dissipation can be achieved even when the external ambient temperature is high. Furthermore, a fixed plate is provided under the connecting base (the fixed plate is used to fix the motor in the equipment), and a shock-absorbing spring and a damper are provided between the connecting base and the fixed plate. The cooperation between the shock-absorbing spring and the damper is utilized to reduce vibration of the motor, thereby improving the operating stability of the motor. Heat accumulates on the lower surface of the semiconductor heat sink during operation, and the heat is transferred to the helium in the filling airbag through the heat spreader and the connecting copper tube. The helium expands under the action of heat, thereby utilizing the elastic effect of the filling airbag in combination with the damper to achieve a better damping effect.

[0019] 2. Use a fixing clip to fix the mounting bracket on the inner surface of the front cover. Install drying cotton inside the mounting bracket. The position of the drying cotton corresponds to the position of the heat dissipation holes. When air enters the motor housing through the heat dissipation holes, it first passes through the drying cotton and absorbs moisture in the air, thereby preventing moisture from entering the motor housing and causing damage. Furthermore, the mounting frame is divided into an outer frame and an inner frame. During the rotation of the output shaft, the friction block fixed on the outside is driven to rotate synchronously. At this time, the friction force of the friction block is used to drive the transmission roller to rotate, and the inner frame is driven under the transmission action of the transmission roller, so that the inner frame drives the drying cotton to rotate. At this time, under the action of centrifugal force, the adsorbed water in the drying cotton is discharged into the storage tank, ensuring the subsequent water absorption effect of the drying cotton. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the motor housing of the present invention; Figure 3 This is a schematic diagram of the heat dissipation fan structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the connection base of the present invention; Figure 5 This is a schematic diagram of the upper surface structure of the fixed plate of the present invention; Figure 6 For the present invention Figure 5 A in the middle is an enlarged structural diagram; Figure 7 This is a schematic diagram of the positional relationship between the semiconductor refrigeration plate and the heat sink of the present invention; Figure 8 This is a schematic diagram of the inner structure of the front cover of the present invention; Figure 9 This is a schematic diagram of the structure of the drying cotton of the present invention; Figure 10 It is a schematic diagram of the internal structure of the outer frame of the present invention.

[0021] In the figure: 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 groove; 13. Semiconductor cooling plate; 14. Air inlet hole; 15. Connecting hole; 16. Shielding plate; 17. Fixing plate; 18. Shock-absorbing spring; 19. Damper; 20. Filling airbag; 21. Connecting copper tube; 22. Heat spreader; 23. Mounting frame; 2301. Outer frame; 2302. Inner frame; 24. Fixing clip; 25. Drying cotton; 26. Through hole; 27. Drive roller; 28. Friction block; 29. Storage tank. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figure 1-Figure 5In order to achieve the purpose of enhancing the heat dissipation of the motor, this embodiment provides the following technical solutions, which specifically disclose: a motor housing 1 with a hollow cylindrical structure, a front cover plate 2 and a rear cover plate 3 are fixedly installed on the front and rear sides of the motor housing 1, and a power supply harness 4 is fixedly welded to the outside of the rear cover plate 3, an output shaft 5 is arranged inside the motor housing 1 and passes through the front cover plate 2, and the rear end of the output shaft 5 is coaxially fixed with a rotor assembly 6, and 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, and heat dissipation holes 9 are provided 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 outside of the lower surface of the shell 1, and a receiving groove 12 is opened inside the connecting base 11, and a refrigeration mechanism for enhancing the heat dissipation effect is arranged inside the receiving groove 12; the refrigeration mechanism includes a semiconductor refrigeration plate 13 fixedly installed inside the receiving groove 12, and the upper surface of the semiconductor refrigeration plate 13 is cooled and the lower surface is heated, and air inlet holes 14 connected to the receiving groove 12 are opened on the front and back sides of the connecting base 11, and the positions of the connecting holes 15 of the connecting base 11 correspond to each other, and the connecting holes 15 are evenly opened on the lower surface of the motor housing 1, and a baffle 16 for extending the air retention time is fixedly installed inside the receiving groove 12, and the baffles 16 are staggered.

[0024] First, use the fixing plate 17 with bolts to install the motor to the use position, then connect the power supply harness 4 to power the motor, and under the action of the electromagnetic induction principle, the rotor assembly 6 rotates to drive the output shaft 5 to rotate, thereby driving the load. In this process, the rotor assembly 6 drives the cooling fan 8 on the rear side to rotate synchronously, and the rotation of the cooling fan 8 drives the surrounding air flow, so that the external air enters through the cooling holes 9 of the front cover 2 and is discharged from the cooling holes 9 of the rear cover 3, thereby achieving the purpose of dissipating heat inside the motor housing 1. At the same time, the cooling fins 10 on the outside of the motor housing 1 can increase the heat conduction speed and further enhance the heat dissipation effect. When the internal air flows, a pressure difference is formed with the outside. Under the action of the pressure, the outside air is sucked into the receiving groove 12 inside the connection base 11 through the air inlet hole 14. At this time, the semiconductor cooling plate 13 inside the receiving groove 12 is turned on to cool the air entering the receiving groove 12 (the retention time of the air inside the receiving groove 12 is increased under the shielding effect of the shielding 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, thereby improving the heat dissipation effect inside the motor housing 1, so that a good heat dissipation effect can still be achieved when the external temperature is high.

[0025] Example 2: Please refer to Figure 6-Figure 7In order to achieve the purpose of shock absorption during the operation of the motor, this embodiment provides the following technical solutions, which specifically disclose: a fixing plate 17 for fixing the motor is installed on the lower surface of the connecting base 11, and a shock absorption mechanism is set on the fixing plate 17 and the connecting base 11; the shock absorption mechanism includes a shock absorption spring 18 and a damper 19 fixedly installed between the connecting base 11 and the fixing plate 17, and a filling air bag 20 is also fixedly installed between the connecting base 11 and the fixing plate 17, and a connecting copper tube 21 is inserted into the filling air bag 20, and the connecting copper tube 21 is set to a bent structure, and a heat spreader 22 is fixedly installed on the upper surface of the connecting copper tube 21, and the upper surface of the heat spreader 22 is close to the lower surface of the semiconductor refrigeration plate 13.

[0026] When the motor is in use, it generates vibrations, and the shock-absorbing spring 18 connecting the base 11 and the fixed plate 17 is used to absorb the vibration force, and the damper 19 is used to achieve the purpose of shock absorption. At the same time, the heat spreader 22 is in contact with the lower surface of the semiconductor refrigeration plate 13 (the semiconductor refrigeration plate 13 cools and heats at the same time when working, with the upper surface for cooling and the lower surface for heating). The heat is transferred to the filling airbag 20 through the heat spreader 22 and the connecting copper tube 21 in contact with the heat spreader 22, so that the helium in the filling airbag 20 expands. Under the filling action of the helium, the support and elastic effect of the filling airbag 20 are maintained, thereby achieving a better shock absorption effect in cooperation with the shock-absorbing spring 18 and the damper 19.

[0027] Example 3: Please refer to Figures 8-10 In order to achieve the purpose of drying the heat dissipated air, this embodiment provides the following technical solutions, which specifically discloses that: a mounting frame 23 is provided on the inner surface of the front cover 2, and a drying cotton 25 is installed inside the mounting frame 23, the mounting frame 23 is divided into an outer frame 2301 and an inner frame 2302 in a ring structure, and the drying cotton 25 is fixedly installed on 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 2 by a fixing clip 24, and 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 position of the drying cotton 25, two transmission rollers 27 are rotatably installed on the inner surface of the front cover 2, and the outer side of the transmission roller 27 is in contact with the inner surface of the inner frame 2302 for friction, and the inner side of the transmission roller 27 is in contact with the friction block 28 for friction, and the friction block 28 is fixedly installed on the outside of the output shaft 5.

[0028] During the heat dissipation process of the motor, air enters the interior of the motor housing 1 through the heat dissipation holes 9 opened in the front cover 2. At this time, the air passes through the drying cotton 25 inside the mounting frame 23, and the drying cotton 25 absorbs moisture in the air, thereby preventing moisture from entering the interior of the motor and causing damage. When the output shaft 5 rotates, it drives the friction block 28 fixed on its outside to rotate synchronously, and utilizes the friction force outside the friction block 28 to drive the transmission roller 27 to rotate. During the rotation process, the transmission roller 27 utilizes the friction force to drive the inner frame 2302 to rotate, so that the inner frame 2302 drives the drying cotton 25 to rotate, and utilizes the centrifugal force of the rotation of the drying cotton 25 to discharge the water adsorbed inside and collect it into the storage tank 29, thereby ensuring the subsequent drying effect of the drying cotton 25.

[0029] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A brushless motor capable of efficient heat dissipation, comprising a motor housing (1) in a hollow cylindrical structure, a front cover (2) and a rear cover (3) fixedly mounted on the front and rear sides of the motor housing (1), and a power supply harness (4) fixedly welded to the outside of the rear cover (3), characterized in that: An output shaft (5) penetrating the front cover (2) is provided inside the motor housing (1), and a rear end of the output shaft (5) is coaxially fixed to a rotor assembly (6), and the rotor assembly (6) corresponds to a stator assembly (7) fixedly mounted on the inner wall of the motor housing (1); A cooling fan (8) is fixedly mounted on the rear end of the rotor assembly (6), and cooling holes (9) are provided inside the front cover (2) and the rear cover (3), and cooling fins (10) are fixedly mounted on the outer surface of the motor housing (1), and a connecting base (11) is fixedly mounted on the outer surface of the lower surface of the motor housing (1), and a receiving groove (12) is provided inside the connecting base (11), and a refrigeration mechanism for enhancing the heat dissipation effect is provided inside the receiving groove (12); A fixing plate (17) for fixing the motor is installed on the lower surface of the connecting base (11), and a shock absorbing mechanism is provided between the fixing plate (17) and the connecting base (11); A mounting frame (23) is provided on the inner surface of the front cover plate (2), and drying cotton (25) is installed on the inner side of the mounting frame (23).

2. The brushless motor with high heat dissipation efficiency according to claim 1, characterized in that: The refrigeration mechanism comprises a semiconductor refrigeration plate (13) fixedly mounted inside the accommodating groove (12), wherein the upper surface of the semiconductor refrigeration plate (13) cools and the lower surface heats.

3. The brushless motor with high heat dissipation efficiency according to claim 2, characterized in that: Air inlet holes (14) communicating with the accommodating groove (12) are provided on the front and rear sides of the connecting base (11), and the positions of the communicating holes (15) of the connecting base (11) correspond to each other, and the communicating holes (15) are evenly provided on the lower surface of the motor housing (1).

4. The brushless motor with high heat dissipation efficiency according to claim 3, characterized in that: A shielding plate (16) for extending the air retention time is fixedly installed inside the accommodating groove (12), and the shielding plates (16) are distributed in a staggered manner.

5. The brushless motor with high heat dissipation efficiency according to claim 4, characterized in that: The shock absorbing mechanism comprises a shock absorbing spring (18) and a damper (19) fixedly mounted between the connecting base (11) and the fixing plate (17), and a filling airbag (20) is also fixedly mounted between the connecting base (11) and the fixing plate (17), wherein the filling airbag (20) is filled with helium.

6. The brushless motor with high heat dissipation efficiency according to claim 5, characterized in that: A connecting copper tube (21) is inserted into the filling air bag (20), and the connecting copper tube (21) is configured as a bent structure. A heat spreader (22) is fixedly mounted on the upper surface of the connecting copper tube (21), and the upper surface of the heat spreader (22) is close to the lower surface of the semiconductor refrigeration plate (13).

7. The brushless motor with high heat dissipation efficiency according to claim 1, characterized in that: The mounting frame (23) is divided into an outer frame (2301) and an inner frame (2302) in an annular structure, and the drying cotton (25) is fixedly mounted on the inner frame (2302), and a sliding structure is formed between the drying cotton (25) and the outer frame (2301).

8. The brushless motor with high heat dissipation efficiency according to claim 7, characterized in that: The outer frame (2301) is fixedly mounted on the inner surface of the front cover (2) using a fixing clip (24), and through holes (26) are evenly opened inside the drying cotton (25).

9. The brushless motor with high heat dissipation efficiency according to claim 8, characterized in that: A storage tank (29) for storing filtered water is provided inside the outer frame (2301), and the storage tank (29) is communicated with the edge of the drying cotton (25).

10. The brushless motor with high heat dissipation efficiency according to claim 8, characterized in that: Two transmission rollers (27) are rotatably mounted on the inner surface of the front cover (2), and the outer sides of the transmission rollers (27) are in contact with and rub against the inner surface of the inner frame (2302), and the inner sides of the transmission rollers (27) are in contact with and rub against the friction blocks (28), and the friction blocks (28) are fixedly mounted on the outside of the output shaft (5).

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