Water-cooled motor with internal wind path circulation
By introducing an internal air circulation system into the water-cooled motor, the problem of rotor heat dissipation difficulty was solved, resulting in more efficient heat dissipation and longer bearing life.
Patent Information
- Application Number
- CN202423189059.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In the existing technology, the heat dissipation design of existing water-cooled motors is not effective, especially the heat dissipation of the magnets in the rotor part is difficult, which leads to excessive motor temperature, affecting working efficiency and bearing life.
An internal air circulation system is introduced into the water-cooled motor. The circulation air path is formed by the internal fan, air-cooling channel and rotor ventilation holes. Heat exchange is carried out in combination with the water-cooling channel to optimize the heat dissipation effect. The heat exchange is reduced by the baffle plate to reduce the bearing temperature.
It improves the heat dissipation efficiency inside the motor, reduces the temperature of the rotor and winding coils, extends the service life of the bearings, and optimizes the overall heat dissipation effect.
Smart Images
Figure CN223625705U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a water-cooled motor with internal air circulation, belonging to the field of motor technology. Background Technology
[0002] During motor operation, various losses occur, which not only increase the internal temperature of the motor but also reduce its efficiency. When the motor temperature is too high, it will affect its normal operation. Motors need a cooling medium to dissipate the heat generated during operation, thereby preventing a series of problems caused by overheating.
[0003] The main sources of heat in a motor are iron losses, copper losses, and eddy current losses in the magnets. Iron losses consist of losses in the rotor and the wound stator core. Most of the losses in a permanent magnet synchronous motor come from the iron losses in the wound stator core and the copper losses in the windings. These losses are reduced through heat exchange via cooling water channels in the casing. However, the magnet losses and iron losses in the rotor can only exchange heat through air radiation. Since the convective heat transfer efficiency of cooling water is much higher than that of air, heat dissipation of the rotor magnets is difficult. The coils extending beyond the core at both ends of the windings are also difficult to dissipate heat due to their distance from the water channels in the casing. Furthermore, heat inside the casing is transferred to the bearings through the front and rear end covers, increasing the bearing temperature rise and reducing bearing life. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a water-cooled motor with internal air circulation.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a water-cooled motor with internal air circulation, comprising a frame, a motor shaft, a wound stator core, and a rotor. The frame has a front end cover and a rear end cover at its front and rear ends, respectively. A water-cooling channel for cooling water flow is provided on the outer wall of the frame, and an air-cooling channel is provided on the frame outside the water-cooling channel. Both ends of the air-cooling channel are connected to the interior of the frame. The wound stator core is fixedly mounted on the inner wall of the frame, and the wound stator core has winding coils extending from both ends of the wound stator core.
[0006] The motor shaft passes horizontally through the center of the base, and the motor shaft is rotatably fitted with both the front and rear covers; the rotor is fixed on the motor shaft, and the rotor is interference-fitted with the motor shaft, with a horizontal ventilation hole running through the rotor; an internal fan is fixedly installed on the motor shaft, and the internal fan is located at the end of the rotor. The internal fan is used to drive the air on one side of the rotor through the air cooling channel and the ventilation hole on the rotor in sequence, and finally return to one side of the rotor, forming a circulating air path.
[0007] Preferably, the inner fan is located below the winding coil at one end of the stator core with windings, and there is a gap between the inner fan and the rotor.
[0008] Preferably, a baffle plate is provided on the inner wall of both the front cover and the rear cover, and the baffle plate is used to prevent the circulating air path from contacting the front cover or the rear cover.
[0009] Preferably, both the front cover and the rear cover are integrally formed with support rods, and the wind deflector is fixed to the front cover or the rear cover by the support rods.
[0010] Preferably, multiple through holes are provided on both sides of the inner wall of the base, and both ends of the air-cooling channel are connected to the interior of the base through the multiple through holes.
[0011] Preferably, the front end cover is provided with a first bearing, and the motor shaft and the front end cover are rotatably engaged through the first bearing; the rear end cover is provided with a second bearing, and the motor shaft and the rear end cover are rotatably engaged through the second bearing.
[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0013] 1. Based on traditional water cooling, this utility model adds an internal circulating air path to the base. Through the cooperation of the internal fan, the base air cooling channel and the rotor ventilation holes, a circulating air path is formed that passes through one side of the rotor, the air cooling channel, the ventilation holes, and finally returns to the other side of the rotor. This allows the heat inside the rotor and the ends of the winding coils of the stator core to exchange heat with the water cooling channel through the circulating air path, thereby improving the heat dissipation efficiency inside the base and optimizing the heat dissipation effect.
[0014] 2. By installing baffles on both the front and rear covers, the heat exchange between the internal circulating air path of the machine base and the front and rear covers can be reduced, thereby lowering the temperature of the front and rear covers. At the same time, the temperature of the outer rings of the first and second bearings can be reduced, extending their service life. Attached Figure Description
[0015] The technical solution of this utility model will be further described below with reference to the accompanying drawings:
[0016] Appendix Figure 1 This is a schematic diagram of the structure of a water-cooled motor with internal air circulation as described in this utility model;
[0017] Appendix Figure 2 For the appendix Figure 1 Enlarged view of point A in the middle.
[0018] In the diagram: 1. Base; 11. Front cover; 111. Baffle plate; 112. Support rod; 113. First bearing; 12. Rear cover; 121. Second bearing; 13. Water cooling channel; 14. Air cooling channel; 15. Through hole; 2. Motor shaft; 21. Internal fan; 3. Stator core with windings; 31. Winding coil; 4. Rotor; 41. Ventilation hole; 5. Gap. Detailed Implementation
[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0020] As attached Figure 1-2 As shown, the water-cooled motor with internal air circulation according to this utility model includes a frame 1, a motor shaft 2, a wound stator core 3 and a rotor 4. The front end of the frame 1 is provided with a front end cover 11 and a rear end cover 12 respectively. The wound stator core 3 is fixedly installed on the inner wall of the frame 1. The wound stator core 3 has a winding coil 31, which extends out of both ends of the wound stator core 3.
[0021] A water-cooled channel 13 for supplying cooling water is provided on the outer wall of the base 1. An air-cooled channel 14 is provided on the base 1 outside the water-cooled channel 13. Both ends of the air-cooled channel 14 are connected to the interior of the base 1. In this embodiment, multiple through holes 15 are provided on both sides of the inner wall of the base 1. Both ends of the air-cooled channel 14 are connected to the interior of the base 1 through multiple through holes 15.
[0022] The motor shaft 2 passes horizontally through the center of the base 1, and the motor shaft 2 is rotatably engaged with both the front cover 11 and the rear cover 12; wherein, the front cover 11 is provided with a first bearing 113, and the motor shaft 2 is rotatably engaged with the front cover 11 through the first bearing 113; the rear cover 12 is provided with a second bearing 121, and the motor shaft 2 is rotatably engaged with the rear cover 12 through the second bearing 121.
[0023] The rotor 4 is fixed on the motor shaft 2, and the rotor 4 and the motor shaft 2 are interference-fitted. A horizontal ventilation hole 41 is provided through the rotor 4. An internal fan 21 is fixed on the motor shaft 2. In this embodiment, the internal fan 21 is a vertical fan and blows air along the circumference of the motor shaft 2. The internal fan 21 is located at the end of the rotor 4 in the horizontal direction and below the winding coil 31 at one end of the winding stator core 3 in the circumferential direction. The internal fan 21 is used to drive the air on one side of the rotor 4 through the air cooling channel 14 and the ventilation hole 41 on the rotor 4 in sequence, and finally return to one side of the rotor 4 to form a circulating air path.
[0024] During operation, the internal fan 21 rotates, blowing hot air from one side of the rotor 4 towards the inner wall of the base 1. Since the internal fan 21 is located below the winding coil 31 at one end of the stator core 3, it can directly blow air onto the end of the winding coil 31. The hot air from the ends of the rotor 4 and the winding coil 31 enters the air-cooling channel 14 through the through-hole 15 on one side of the base 1, creating a negative pressure on that side of the rotor 4. After entering the air-cooling channel 14, the hot air exchanges heat with the water-cooling channel 13 inside the air-cooling channel 14. After the heat exchange is complete, the cooling air enters the interior of the base 1 through the through-hole 15 on the other side of the base 1. Since the internal fan 21 is not installed on this side, it is under positive pressure. Therefore, the cooling air flows from the positive pressure side to the negative pressure side through the ventilation hole 41 inside the rotor 4, forming the aforementioned circulating airflow path. Please refer to the appendix. Figure 1 The circulating air path is shown with arrows.
[0025] This solution, based on traditional water cooling, adds an internal circulating air path to the base 1. Through the cooperation of the internal fan 21, the air cooling channel 14, and the ventilation holes 41 of the rotor 4, a circulating air path is formed that passes through one side of the rotor 4, the air cooling channel 14, the ventilation holes 41, and finally returns to the other side of the rotor 4. This allows the heat inside the rotor 4 and the ends of the winding coils 31 of the winding stator core 3 to exchange heat with the water cooling channel 13 through the circulating air path, thereby improving the heat dissipation efficiency inside the base 1 and optimizing the heat dissipation effect.
[0026] As attached Figure 2 As shown, in this embodiment, there is a gap 5 between the inner fan 21 and the rotor 4 to prevent the inner fan 21 and the rotor 4 from interfering with each other during operation and causing damage to the inner fan 21 or the rotor 4.
[0027] Both the inner wall of the front cover 11 and the inner wall of the rear cover 12 are provided with wind baffles 111. The wind baffles 111 are used to block the circulating air path from contacting the front cover 11 or the rear cover 12. Specifically, both the front cover 11 and the rear cover 12 are integrally formed with support rods 112, and the wind baffles 111 are fixed to the front cover 11 or the rear cover 12 by the support rods 112.
[0028] By providing baffles 111 on both the front cover 11 and the rear cover 12, the heat exchange between the internal circulating air path of the base 1 and the front cover 11 and the rear cover 12 can be reduced, thereby lowering the temperature of the front cover 11 and the rear cover 12. At the same time, the temperature of the outer ring of the first bearing 113 and the second bearing 121 can be reduced, extending their service life. In addition, by providing support rods 112 to fix the baffles 111, the contact area between the front cover 11 or the rear cover 12 and the baffles 111 can be reduced, thereby reducing the heat transferred from the baffles 111 to the front cover 11 and the rear cover 12.
[0029] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model; all technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of protection of this utility model.
Claims
1. A water-cooled motor with internal air circulation, characterized in that: The device includes a base (1), a motor shaft (2), a wound stator core (3), and a rotor (4). The base (1) has a front end cover (11) and a rear end cover (12) at its front and rear ends, respectively. A water-cooling channel (13) for supplying cooling water is provided on the outer wall of the base (1). An air-cooling channel (14) is provided on the base (1) outside the water-cooling channel (13). Both ends of the air-cooling channel (14) are connected to the inside of the base (1). The wound stator core (3) is fixedly installed on the inner wall of the base (1). The wound stator core (3) has a winding coil (31) on it. The winding coil (31) extends out of both ends of the wound stator core (3). The motor shaft (2) passes horizontally through the center of the base (1), and the motor shaft (2) is rotatably fitted with the front cover (11) and the rear cover (12); the rotor (4) is fixed on the motor shaft (2), and the rotor (4) is interference fitted with the motor shaft (2), and a horizontal ventilation hole (41) is provided through the rotor (4); an internal fan (21) is fixedly installed on the motor shaft (2), and the internal fan (21) is located at the end of the rotor (4). The internal fan (21) is used to drive the air on one side of the rotor (4) through the air cooling channel (14) and the ventilation hole (41) on the rotor (4) in sequence, and finally return to one side of the rotor (4) to form a circulating air path.
2. A water-cooled motor with internal air circulation as described in claim 1, characterized in that: The inner fan (21) is located below the winding coil (31) at one end of the winding stator core (3), and there is a gap (5) between the inner fan (21) and the rotor (4).
3. A water-cooled motor with internal air circulation as described in claim 1, characterized in that: A baffle plate (111) is provided on the inner wall of the front cover (11) and the inner wall of the rear cover (12). The baffle plate (111) is used to prevent the circulating air path from contacting the front cover (11) or the rear cover (12).
4. A water-cooled motor with internal air circulation as described in claim 3, characterized in that: Both the front cover (11) and the rear cover (12) are integrally formed with support rods (112), and the wind baffle (111) is fixed to the front cover (11) or the rear cover (12) by the support rods (112).
5. A water-cooled motor with internal air circulation as described in claim 1, characterized in that: The inner wall of the base (1) is provided with multiple through holes (15) on both sides, and the two ends of the air-cooling channel (14) are connected to the inside of the base (1) through the multiple through holes (15).
6. A water-cooled motor with internal air circulation as described in claim 1, characterized in that: The front end cover (11) is provided with a first bearing (113), and the motor shaft (2) and the front end cover (11) are rotatably connected through the first bearing (113); the rear end cover (12) is provided with a second bearing (121), and the motor shaft (2) and the rear end cover (12) are rotatably connected through the second bearing (121).