A high-voltage, high-efficiency, high-power-density three-phase asynchronous motor
By optimizing the radial ventilation channels, flow holes, and flow guide channels of the stator and rotor cores, and combining them with the optical shaft rotor and internal and external fan circulation cooling system, the problem of poor heat dissipation of the three-phase asynchronous motor was solved, realizing the design of a high-voltage, high-efficiency, and high-power-density motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WOLONG ELECTRIC NANYANG EXPLOSION PROTECTION GRP CO LTD
- Filing Date
- 2024-12-12
- Publication Date
- 2026-06-12
AI Technical Summary
The heat dissipation effect of existing three-phase asynchronous motors is not good. The ventilation channel width of the stator core and rotor core is large, resulting in fewer air channels, smaller contact area, and greater air resistance. In addition, the heat dissipation effect of the rotor core is not good, and the manufacturing cycle of the welded shaft is long and the cost is high.
The width of the radial ventilation channels in the stator and rotor cores is optimized, and flow holes and guide channels are increased. An optical shaft rotor is adopted, combined with an internal and external fan circulation cooling system, to form a multi-branch air circulation, increase the contact area between the ventilation channels and the cooling air, and improve the heat dissipation effect.
It effectively reduces the temperature rise of the motor stator, increases the power density and efficiency of the motor, shortens the production cycle, and reduces iron and copper losses.
Smart Images
Figure CN122203631A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an electric motor, and more particularly to a high-voltage, high-efficiency, high-power-density three-phase asynchronous motor. Background Technology
[0002] Currently, a three-phase asynchronous motor mainly consists of a frame and a rotor core and a stator core installed within the frame. There is an air gap between the rotor core and the stator core. Several sets of radial ventilation channels are installed on the rotor core and the stator core, respectively. The stator core is equipped with windings. A partition plate is installed between the stator core and the frame. A cooler is installed above the frame for cooling. An internal fan is installed inside the frame to circulate airflow. After being cooled by the cooler, the airflow forms a circulating cooling effect inside the frame, thereby removing heat and cooling the motor.
[0003] However, the existing heat exchange methods for three-phase asynchronous motors have the following problems: 1. The stator core radial ventilation channel and rotor core radial ventilation channel of the three-phase asynchronous motor are relatively wide. This results in a small number of ventilation channels and a small contact area with the cooling air when the total core length remains unchanged. This leads to poor heat dissipation and easy for the motor temperature to rise. On the other hand, too many ventilation channels can easily lead to an excessively long total length of the core and frame. 2. When the hot air flowing out of the radial ventilation channel of the stator core enters the winding end, it is limited by space and the flow gap is small, resulting in large air resistance and small air volume inside the frame, which can easily cause the motor temperature to rise.
[0004] 3. The rotor adopts a welded shaft (with 4 or 6 ribs welded along the circumference of the round shaft). The axial ventilation channel of the rotor core is actually composed of the round shaft, the ribs, and the inner wall of the rotor core. Since the three sides of the axial ventilation channel of the rotor core are all circumferential surfaces, and the ribs themselves do not easily generate heat, only one side of the rotor core heats up, resulting in poor heat dissipation of the rotor core in this type of structure. At the same time, the welded shaft requires machining the outer diameter of the round shaft, cutting the ribs, and then performing welding, annealing and other processes, which has the disadvantages of long cycle and high cost. Summary of the Invention
[0005] The purpose of this invention is to provide a high-voltage, high-efficiency, and high-power-density three-phase asynchronous motor that can effectively improve the motor's heat dissipation, reduce the stator temperature rise and internal temperature, and increase the motor's power density and efficiency.
[0006] The present invention adopts the following technical solution: A high-voltage, high-efficiency, high-power-density three-phase asynchronous motor includes a frame with a rotor and a stator inside, and windings on the stator core. A guide plate is inclinedly arranged above the winding ends, which cooperates with the flow holes in the middle partition plate of the frame on the same side to form a guide air duct. A guide channel communicating with the inner cavity of the frame is provided in the lower part of the cooler above the stator core. The airflow from the radial ventilation duct of the stator core enters the winding ends through three branches: the gap between the middle partition plate of the frame and the stator core, the flow holes, and the guide channel, and is circulated in the frame by an internal fan.
[0007] The width of the radial ventilation channel in the stator core and the radial ventilation channel in the rotor core is 4mm-6mm.
[0008] The flow hole is an elongated hole arranged in a left-right direction and penetrating the middle partition of the machine base.
[0009] The flow guiding channel is an arc-shaped channel.
[0010] The position of the wind baffle is adapted to the position of the guide channel near the end of the winding.
[0011] The wind deflector forms a frustum-shaped cover inside the base.
[0012] The rotor adopts an optical axis, and several axial ventilation channels of the rotor core are evenly distributed along the circumference of the rotor.
[0013] Multiple sets of guide holes are evenly arranged between the lower end plate of the cooler and the upper end plate of the base within the coverage area of the guide channel, and the guide channel is connected to the inner cavity of the base through the guide holes.
[0014] The external cold air enters the cooling pipe through the external fan, end cover and air guide tube. The cold air in the cooling pipe exchanges heat with the hot air in the cooling pipe. After absorbing heat and turning into hot air, the cold air in the cooling pipe is discharged outside the base, forming an external air passage.
[0015] The hot air inside the frame enters the cooling pipe's external air duct through an internal fan. The hot air outside the cooling pipe exchanges heat with the cold air inside, and the hot air outside the cooling pipe becomes cold air, entering the frame from the winding terminal side. After passing the winding terminal, it splits into two branches: the first branch enters the stator core radial ventilation duct through the air gap, and the second branch enters the rotor core radial ventilation duct and stator core radial ventilation duct through the rotor core axial ventilation duct. The hot air flowing out of the stator core radial ventilation duct is further divided into three sub-branches to cool the stator core. The first sub-branch enters the winding end through the gap between the frame's central partition and the stator core; the second sub-branch enters the winding end through the flow holes on the frame's central partition; and the third sub-branch enters the winding end through a guide channel above the stator core. Finally, all three sub-branches circulate within the frame through the internal fan.
[0016] This invention, through the optimized design of radial ventilation channels, flow holes, and guide channels in the stator and rotor cores, combined with a shaft rotor equipped with axial ventilation channels in the rotor core, can greatly improve the heat dissipation of a high-voltage, high-efficiency, and high-power-density three-phase asynchronous motor. This effectively reduces the temperature rise of the motor stator, increases the motor power density, and shortens the production cycle. At the same time, the lower internal temperature of the motor further reduces the iron and copper losses of the stator and rotor, thereby further improving the motor efficiency. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure and airflow of the three-phase asynchronous motor in this invention. Detailed Implementation
[0018] 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0019] like Figure 1 As shown, the high-voltage, high-efficiency, high-power-density three-phase asynchronous motor of the present invention includes a frame 1 and a rotor and a stator disposed within the frame 1. The two ends of the rotor are rotatably connected to the frame 1, and the stator is sleeved on the outside of the rotor and fixed to the inner wall of the frame 1. There is an air gap 20 between the rotor core 2 and the stator core 3. Several sets of radial ventilation channels 4 and radial ventilation channels 5 of the rotor core 2 and the stator core 3 are respectively provided to form ventilation paths to cool the motor rotor and stator. Windings are provided on the stator core 3.
[0020] In this invention, a cooler 8 for cooling is also provided above the base 1. The cooler 8 includes a built-in cooling pipe 9 and a cooling pipe external air duct 10. The air inlet of the cooling pipe 9 is connected to the external fan 13 outside the base 1 on one side of the winding terminal 16 through the air guide tube 11 and the end cover 12. The air outlet of the cooling pipe 9 is connected to the outside.
[0021] External cold air enters the cooling pipe 9 through the external fan 13, end cover 12, and air guide 11. The cold air inside the cooling pipe 9 exchanges heat with the hot air outside the cooling pipe 9. After absorbing heat, the cold air inside the cooling pipe 9 is discharged to the outside of the base 1, forming an external air passage.
[0022] In this invention, an internal fan 14 is provided inside the base 1 on the side near the winding end 6. A base intermediate partition 7 is provided between the upper left and right sides of the stator core 3 and the upper inner wall of the base 1. A flow hole 21 is provided on the base intermediate partition 7 on the side near the winding end 6. The above structure allows the hot air flowing out of the stator core radial ventilation channel 5 to directly enter the winding end 6 through the flow hole 21, effectively solving the defect in the prior art that the hot air flowing out of the stator core radial ventilation channel 5 can only enter the winding end 6 through the gap 18 between the base intermediate partition 7 and the stator core 3, thereby solving the defects of large wind resistance and small air volume in the base 1.
[0023] In this invention, a flow guide channel 22 is also provided at the lower part of the cooler 8 above the stator core 3. Multiple sets of flow guide holes can be evenly arranged between the lower end plate of the cooler 8 and the upper end plate of the frame 1 within the coverage area of the flow guide channel 22. The flow guide channel 22 is connected to the inner cavity of the frame 1 above the stator core 3 through the flow guide holes. The design of the flow guide channel 22 can form a flow guide effect on the hot air flowing out of the radial ventilation channel 5 of the stator core at the lower part of the cooler 8, so that the hot air flows into the flow guide channel 22 through the flow guide holes. In order to cooperate with the guide channel 22 and allow the hot air introduced into the guide channel 22 to re-enter the winding end 6 to form an air circulation, in this invention, a guide plate is also inclinedly provided above the winding end 6. The guide plate can be a baffle plate 23. The position of the baffle plate 23 is adapted to the position of the end of the guide channel 22 near the winding end 6. The baffle plate 23 can cooperate with the flow hole provided on the middle partition of the base on the same side to form a guide air channel, so that the hot air flowing out through the guide channel 22 and the flow hole 21 on the middle partition of the base can smoothly enter the winding end 6 and achieve air circulation in the base 1 through the internal fan 14.
[0024] In this invention, the airflow flowing out of the radial ventilation channel 5 of the stator core is divided into three sub-branches for flow. The first sub-branchine is introduced into the winding end 6 through the gap 18 between the intermediate partition 7 of the frame and the stator core 3. The second sub-branchine is introduced into the winding end 6 through the flow hole 21 provided on the intermediate partition 7 of the frame. The third sub-branchine is introduced into the winding end 6 through the guide channel 22 above the stator core 3. Finally, all three sub-branches are circulated in the frame 1 through the internal fan 14 to achieve internal air circulation.
[0025] In order to maximize the total number of stator core radial ventilation channels 5 and rotor core radial ventilation channels 4 while keeping the total core length constant, and to maximize the contact area between the ventilation channels and the cooling air, in this embodiment, the width of the stator core radial ventilation channel 5 and rotor core radial ventilation channel 4 is set to 4mm-6mm, preferably 5mm. Compared with the traditional high-voltage, high-efficiency, high-power-density three-phase asynchronous motor structure design, this invention reduces the width of the ventilation duct from 10mm to 5mm. This effectively increases the number of stator core radial ventilation ducts 5 and rotor core radial ventilation ducts 4 without changing the total core length, thereby increasing the contact area between the ventilation ducts and the cooling air. Experimental results show that this can reduce the stator temperature rise of the motor by 2℃-4℃. In this embodiment, the flow hole 21 is an elongated hole arranged in the left and right direction and penetrating the middle partition plate 7 of the base; the guide channel 22 can be an arc-shaped channel, and the baffle plate 23 forms a frustum-shaped cover inside the base 1.
[0026] Through the optimized design of the flow hole 21 and the guide channel 22, the hot air inside the frame 1 enters the cooling pipe external air duct 10 through the internal fan 14. The hot air outside the cooling pipe 9 exchanges heat with the cold air inside the cooling pipe 9. After the hot air outside the cooling pipe 9 becomes cold air, it enters the frame 1 from the winding terminal 16 side and is divided into two branches after passing through the winding terminal 16: the first branch enters the stator core radial ventilation duct 5 through the air gap 20, and the second branch enters the rotor core radial ventilation duct 17 through the rotor core axial ventilation duct 17. 4. Stator core radial ventilation duct 5; the hot air flowing out of the stator core radial ventilation duct 5 is divided into three sub-branches to cool the stator core 3. The first sub-branch enters the winding end 6 through the gap 18 between the frame partition 7 and the stator core 3; the second sub-branch enters the winding end 6 through the flow hole 21 on the frame partition 7; the third sub-branch enters the winding end 6 through the guide channel 22 above the stator core 3; all three sub-branches finally circulate within the frame 1 through the internal fan 14. The above-mentioned optimized airflow design can further reduce the wind resistance of the hot air flowing out of the stator core radial ventilation duct 5 during the flow process, thereby enhancing the heat dissipation effect. Experimental results show that it can reduce the temperature rise of the motor stator by 3℃-4℃. In this embodiment, the rotor uses a smooth shaft instead of a welded shaft; several axial ventilation channels 17 are evenly distributed along the circumference of the rotor core. The axial ventilation channels 17 directly pass through the rotor core 2, resulting in a large ventilation contact area and significant cooling effect. Experimental results show that they can reduce the stator temperature rise of the motor by 3℃-5℃; at the same time, they can shorten the rotor shaft manufacturing cycle by about 10 days.
[0027] This invention, through the optimized design of the radial ventilation channels 4, flow holes 21, and guide channels 22 of the stator and rotor cores, combined with a smooth-shaft rotor equipped with an axial ventilation channel 17 in the rotor core, can greatly improve the heat dissipation of a high-voltage, high-efficiency, and high-power-density three-phase asynchronous motor. This effectively reduces the temperature rise of the motor stator, increases the power density of the motor, and shortens the production cycle. At the same time, the lower internal temperature of the motor further reduces the iron and copper losses of the stator and rotor, further improving the efficiency of the motor. Ultimately, this invention achieves the characteristics of a high-voltage, high-efficiency, and high-power-density three-phase asynchronous motor.
Claims
1. A high-voltage, high-efficiency, high-power-density three-phase asynchronous motor, comprising a frame with a rotor and a stator, and windings disposed on the stator core; characterized in that: A guide plate is inclinedly installed above the winding end, which cooperates with the flow hole on the middle partition of the frame on the same side to form a guide air channel; a guide channel communicating with the inner cavity of the frame is provided at the lower part of the cooler above the stator core; the airflow from the radial ventilation channel of the stator core enters the winding end through three branches: the gap between the middle partition of the frame and the stator core, the flow hole and the guide channel, and the airflow is circulated in the frame by the internal fan.
2. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: The width of the radial ventilation channel in the stator core and the radial ventilation channel in the rotor core is 4mm-6mm.
3. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: The flow hole is an elongated hole arranged in a left-right direction and penetrating the middle partition of the machine base.
4. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: The flow guiding channel is an arc-shaped channel.
5. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: The position of the wind baffle is adapted to the position of the end of the flow guide channel near the end of the winding.
6. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: The wind deflector forms a frustum-shaped cover inside the base.
7. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: The rotor adopts an optical axis, and several axial ventilation channels of the rotor core are evenly distributed along the circumference of the rotor.
8. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: Multiple sets of guide holes are evenly arranged between the lower end plate of the cooler and the upper end plate of the base within the coverage area of the guide channel, and the guide channel is connected to the inner cavity of the base through the guide holes.
9. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 1, characterized in that: The cooler includes a cooling pipe and an external air duct for the cooling pipe. External cold air enters the cooling pipe through an external fan, end cover, and air guide tube outside the base. The cold air inside the cooling pipe exchanges heat with the hot air inside the cooling pipe. After absorbing heat and turning into hot air, the cold air inside the cooling pipe is discharged outside the base, forming an external air duct.
10. The high-voltage, high-efficiency, high-power-density three-phase asynchronous motor according to claim 9, characterized in that: Hot air inside the frame enters the cooling pipe's external air duct through an internal fan. The hot air outside the cooling pipe exchanges heat with the cold air inside, turning into cold air that enters the frame from the winding terminal side. After passing the winding terminal, it splits into two branches: the first branch enters the stator core radial ventilation duct through an air gap, and the second branch enters both the rotor core radial ventilation duct and the stator core radial ventilation duct through the rotor core axial ventilation duct. The hot air flowing out of the stator core radial ventilation duct is further divided into three sub-branches to cool the stator core. The first sub-branch enters the winding end through the gap between the frame's central partition and the stator core; the second sub-branch enters the winding end through flow holes on the frame's central partition; and the third sub-branch enters the winding end through a guide channel above the stator core. All three sub-branches ultimately circulate within the frame through the internal fan.