Motor with double-fan ventilation structure

Abstract

The utility model discloses a kind of motor with double-fan ventilation structure, including front end cover, motor shell, rear end cover, stator core, rotor core and rotor shaft, the front end cover and rear end cover are respectively arranged at the both ends of motor shell, the stator core is arranged in the inside of motor shell, the rotor core is arranged in the inside of stator core, the rotor shaft is connected in rotor inside, the front and back two sides of the rotor shaft are connected with first fan and second fan respectively, the stator core is evenly provided with a plurality of front and rear through first heat dissipation channels, the rotor core is evenly provided with a plurality of front and rear through second heat dissipation channels. The scheme is simultaneously operated by fan in front and rear two ends, forms double-side forced air cooling, significantly enhances air convection efficiency, quickly takes away the heat generated by stator and rotor, avoids motor overheating.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor with a dual-fan ventilation structure. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy through electromagnetic induction, and it has a huge market potential. However, when a motor is running, the losses generated during operation increase, leading to excessive overall or localized temperature rise. This not only reduces the motor's lifespan and affects its efficiency, torque, and other economic and technical indicators, but also causes severe deformation of the motor's structural components, endangering the motor's operational safety.

[0003] Chinese patent application number 2015206324108 discloses a brushless motor with a built-in cooling fan, including a motor body, a front cover and a rear cover on both sides of the motor body, and side end covers covering the side walls of the motor body. A cooling fan is located inside the front cover and rotates with the motor shaft. The cooling fan includes a base plate, one side of which has several blades, and the other side of which has several evenly distributed reinforcing ribs. Both the front and rear covers have several symmetrical notches, and the length of the notches relative to the side end covers is greater than or equal to the overall thickness of the cooling fan. This design allows for higher air exchange frequency and better heat dissipation.

[0004] The above solution utilizes a fan installed on the inner end of the motor to cool it down. However, the disadvantage of the above solution compared to existing technologies is that while the side where the fan motor is installed provides sufficient cooling, the other side, which is far from the fan, suffers from insufficient heat dissipation. This results in uneven temperature distribution in the stator windings, core, and bearings, leading to differences in the expansion of metal components such as end caps and housings, which can easily cause localized overheating. Utility Model Content

[0005] To solve the above problems, this utility model provides a motor with a dual-fan ventilation structure, including a front cover, a motor housing, a rear cover, a stator core, a rotor core, and a rotor shaft. The front cover and the rear cover are respectively located at both ends of the motor housing. The stator core is located inside the motor housing, and the rotor core is located inside the stator core. The rotor shaft is connected to the inside of the rotor. A first fan and a second fan are respectively connected to the front and rear sides of the rotor shaft. A plurality of first heat dissipation channels are evenly distributed on the stator core, and a plurality of second heat dissipation channels are evenly distributed on the rotor core.

[0006] Preferably, the surface of the front end cover is provided with a first main vent, and the surface of the rear end cover is provided with a second main vent.

[0007] Preferably, the front end cover has a first annular sidewall on its side, and a first side ventilation opening is provided on the first annular sidewall; the rear end cover has a second annular sidewall on its side, and a second side ventilation opening is provided on the second annular sidewall.

[0008] Preferably, the first heat dissipation channel is inclined relative to the central axis of the rotor shaft.

[0009] Preferably, the rotor shaft has a third heat dissipation channel inside, and air inlet and air outlet are respectively opened at both ends of the rotor shaft.

[0010] The advantages of this utility model are:

[0011] 1. This design utilizes a dual-fan ventilation structure, with a first fan and a second fan installed at both ends of the rotor shaft. This dual-fan structure allows air to circulate synchronously on both sides of the motor during operation. Compared to the traditional single-fan structure, this significantly increases airflow, enabling the motor's internal heat to be dissipated more quickly and effectively preventing localized overheating caused by uneven heat dissipation.

[0012] 2. This solution provides heat dissipation channels on the stator core and rotor core, allowing airflow to circulate not only in the space between the front and rear end covers but also through the interior of the core. This enables the air to carry away heat more comprehensively and evenly, significantly improving heat dissipation efficiency.

[0013] 3. This solution creates a multi-path airflow pattern inside the motor by setting first and second side ventilation openings on the first and second annular sidewalls respectively, in conjunction with the operation of dual fans. On one hand, some air flows through the first and second heat dissipation channels, directly carrying away heat from the stator and rotor cores; on the other hand, most of the air is discharged from the side ventilation openings after impacting the core, achieving effective cooling of the core surface. This multi-path heat dissipation structure not only improves the overall heat dissipation efficiency but also ensures that all heat-generating parts inside the motor are adequately cooled, effectively reducing temperature differences and temperature gradients between components.

[0014] 4. In this design, the first heat dissipation channel is inclined relative to the central axis of the rotor shaft, which lengthens the air flow path and residence time in the channel, and generates a turbulence effect during the flow process. This effectively breaks the laminar flow state, enhances the heat exchange capacity between the air and the iron core surface, avoids heat accumulation, and further improves the uniformity and efficiency of heat dissipation.

[0015] 5. In this design, a third heat dissipation channel is installed inside the rotor shaft, with air inlets and outlets at both ends, allowing cool air to flow directly through the rotor shaft. This internal cooling design can promptly remove the heat generated by electromagnetic losses and mechanical friction within the rotor shaft, preventing structural deformation caused by high-temperature expansion of the shaft, thereby ensuring the mechanical strength and structural stability of the motor during operation. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present utility model.

[0017] Figure 2 This is an exploded structural diagram of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of the stator core and rotor core of this utility model.

[0019] Figure 4 This is a diagram showing the internal structure of the rotor shaft of this utility model.

[0020] In the diagram: 1. Front cover, 2. Motor housing, 3. Rear cover, 4. Stator core, 5. Rotor core, 6. Rotor shaft, 7. First fan, 8. Second fan, 9. First heat dissipation channel, 10. Second heat dissipation channel, 11. First main vent, 12. Second main vent, 13. First annular sidewall, 14. First side vent, 15. Second annular sidewall, 16. Second side vent, 17. Third heat dissipation channel, 18. Air inlet, 19. Air outlet. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1, as Figure 1-2 As shown, a motor with a dual-fan ventilation structure includes a front cover 1, a motor housing 2, a rear cover 3, a stator core 4, a rotor core 5, and a rotor shaft 6. The front cover 1 and the rear cover 3 are respectively assembled at both ends of the motor housing 2. The stator core 4 is located inside the motor housing 2, and the rotor core 5 is located inside the stator core 4. The rotor shaft 6 is connected to the inner side of the rotor, and a first fan 7 and a second fan 8 are respectively connected to the front and rear sides of the rotor shaft 6. The front cover 1 has a first annular sidewall 13 on its side, and the space formed inside the first annular sidewall 13 is used to accommodate the rotation of the first fan 7. The rear cover 3 has a second annular sidewall 15 on its side, and the space formed inside the second annular sidewall 15 is used to accommodate the rotation of the second fan 8. When the motor starts running, the rotor shaft 6 drives the first fan 7 and the second fan 8 on both sides to rotate simultaneously. The dual-fan structure allows airflow to be generated on both the front and rear sides of the motor during operation. Compared with a single-fan motor, the airflow is greatly increased, which can more quickly remove the heat generated inside the motor. Meanwhile, the front and rear fans correspond to the front and rear parts of the motor respectively, which can dissipate heat to the front and rear areas of the motor separately, avoiding the problem of local overheating of the motor that may occur when using a single fan for cooling.

[0025] Combination Figure 3The stator core 4 has several uniformly spaced first heat dissipation channels 9 running through it, and the rotor core 5 has several uniformly spaced second heat dissipation channels 10 running through it. The first and second heat dissipation channels 9 and 10 provide additional airflow paths within the motor. When the motor is running, the airflow generated by the dual fans not only circulates within the space formed by the front and rear end covers 3, but also flows through these through-channels within the stator core 4 and rotor core 5, carrying away more heat and significantly improving heat dissipation efficiency. Simultaneously, the presence of these channels increases the contact area between the stator core 4 and rotor core 5 and the air. More core surfaces are directly exposed to the flowing air, allowing heat to be transferred to the air more quickly, thus accelerating heat dissipation. Finally, because the heat dissipation channels allow air to flow within the stator core 4 and rotor core 5, heat can be dissipated more evenly, preventing localized overheating.

[0026] Combination Figure 2 The front cover 1 has a first main ventilation port 11 on its surface, and the rear cover 3 has a second main ventilation port 12 on its surface. The first main ventilation port 11 and the second main ventilation port 12 are located at the front and rear covers 3 of the motor, respectively, forming a channel for air to enter and exit the motor. When the motor is running, the dual fans rotate, driving airflow. External cold air can enter the motor through the first main ventilation port 11, while the hot air generated by the motor operation can be discharged through the second main ventilation port 12. The first main ventilation port 11 and the second main ventilation port 12 allow air to enter and exit the motor more smoothly, reducing airflow resistance, resulting in a smaller temperature rise inside the motor and enabling it to maintain a stable working state for a longer period of time.

[0027] A first side ventilation opening 14 is provided on the first annular sidewall 13, and a second side ventilation opening 16 is provided on the second annular sidewall 15. When the first fan 7 rotates, external air enters the motor through the first main ventilation opening 11. At this time, some air flows through the first heat dissipation channel 9 and the second heat dissipation channel 10 to the second main ventilation opening 12, which can directly carry away the heat generated inside the stator core 4 and the rotor core 5. However, most of the air will collide with the stator core 4 and the rotor core 5 and then flow out through the first side ventilation opening 14 to dissipate heat on the surface of the core. This multi-path airflow method allows the air to more comprehensively cover all the heat-generating parts inside the motor, greatly improving the heat dissipation efficiency. Similarly, when the second fan 8 rotates, some external air enters the motor through the second side ventilation opening 16, and then is discharged from the second main ventilation opening 12 along with the air that has passed through the two heat dissipation channels. This part of the air can provide targeted heat dissipation for the rear area of ​​the motor, making up for the lack of local heat dissipation by the first fan 7 and ensuring that all parts of the motor are adequately cooled. Multi-path heat dissipation can remove heat from the motor more evenly, reducing temperature differences between internal components and lowering the temperature gradient. Lowering the temperature gradient effectively reduces the impact of thermal stress on motor components, ensuring the motor's mechanical strength and structural stability.

[0028] In this embodiment, since the motor operates in a relatively clean environment with little dust or particulate matter in the air, and the dual-fan structure provides a large airflow and high velocity, a self-cleaning airflow path can be formed during operation. Some fine dust or impurities that enter are directly carried out of the motor channel, providing a certain level of impurity removal capability and reducing the risk of impurity accumulation. Therefore, no additional filter is needed. However, in environments with high dust concentrations or a large amount of fiber or lint, filters must be installed at the first main ventilation port 11, the second main ventilation port 12, the first side ventilation port 14, and the second side ventilation port 16. Although the filters will create some resistance to airflow, they can prevent dust and fibers that may be carried in the air from easily entering the motor, keeping the airflow unobstructed and ensuring long-term stable heat dissipation efficiency.

[0029] Combination Figure 3-4The first heat dissipation channel 9 is inclined relative to the central axis of the rotor shaft 6. When air passes through the inclined first heat dissipation channel 9, its flow path becomes relatively longer. The air stays in the channel for a longer time, allowing more time to exchange heat with the stator core 4, thus carrying away more heat. At the same time, the inclined channel causes turbulence in the airflow. Turbulence can break the laminar flow of air, making the heat exchange between the air and the surface of the core more complete. Turbulence can also prevent the formation of dead zones in the channel, ensuring that the air can evenly carry away heat from all parts of the core. The rotor shaft 6 has a third heat dissipation channel 17 inside. Air inlet 18 and air outlet 19 are respectively opened at both ends of the rotor shaft 6. The rotor shaft 6 will generate heat due to electromagnetic losses, mechanical friction, and other factors during motor operation. The presence of the third heat dissipation channel 17 allows external cold air to directly enter the rotor shaft 6 and come into direct contact with the shaft, carrying away heat. Compared to relying solely on external air to dissipate heat from the surface of the rotor shaft 6, this internal cooling method can more effectively reduce the operating temperature of the rotor shaft 6, reduce problems such as thermal expansion and deformation of the shaft caused by high temperature, and further ensure the stable operation of the motor.

[0030] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motor with a dual-fan ventilation structure, characterized in that: The motor housing includes a front cover (1), a motor housing (2), a rear cover (3), a stator core (4), a rotor core (5), and a rotor shaft (6). The front cover (1) and the rear cover (3) are respectively located at both ends of the motor housing (2). The stator core (4) is located inside the motor housing (2). The rotor core (5) is located inside the stator core (4). The rotor shaft (6) is connected to the inside of the rotor. A first fan (7) and a second fan (8) are respectively connected to the front and rear sides of the rotor shaft (6). Several first heat dissipation channels (9) are evenly distributed on the stator core (4). The sub-core (5) is evenly provided with several second heat dissipation channels (10) that run through the front and rear. The surface of the front end cover (1) is provided with a first main ventilation port (11). The surface of the rear end cover (3) is provided with a second main ventilation port (12). The side of the front end cover (1) is provided with a first annular sidewall (13). The first annular sidewall (13) is provided with a first side ventilation port (14). The side of the rear end cover (3) is provided with a second annular sidewall (15). The second annular sidewall (15) is provided with a second side ventilation port (16). The first heat dissipation channel (9) is inclined relative to the central axis of the rotor shaft (6).

2. The motor with a dual-fan ventilation structure according to claim 1, characterized in that: The rotor shaft (6) has a third heat dissipation channel (17) inside, and air inlet (18) and air outlet (19) are respectively opened at both ends of the rotor shaft (6).

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