High-voltage, high-efficiency and 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 heat dissipation problem of the three-phase asynchronous motor was solved, achieving a high-efficiency, high-power-density, and high-efficiency motor design.
Patent Information
- Application Number
- CN202423067318.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-12
AI Technical Summary
The existing three-phase asynchronous motors have large stator core radial ventilation channels and rotor core radial ventilation channels, resulting in fewer ventilation channels, smaller contact area, and poor heat dissipation. In addition, the rotor core axial ventilation channel has poor heat dissipation, and the welded shaft has a long manufacturing cycle and high cost.
The width of the radial ventilation channels of the stator and rotor core is optimized to 4mm-6mm. Flow holes and guide channels are set. A smooth shaft rotor is adopted and the rotor core axial ventilation channel is set along the circumference on the rotor. Combined with the internal and external fan circulation cooling system, a multi-branch air circulation is formed.
It improves the heat dissipation of the motor, reduces the stator temperature rise, increases power density and efficiency, shortens the production cycle, and reduces iron and copper losses.
Smart Images
Figure CN223957356U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a motor especially to a high-voltage high-efficiency high-power density three-phase asynchronous motor. BACKGROUND
[0002] At present, the three-phase asynchronous motor mainly includes a base and a rotor iron core and a stator iron core arranged in the base, the rotor iron core and the stator iron core have an air gap between them, a plurality of groups of rotor iron core radial air ducts and stator iron core radial air ducts are arranged on the rotor iron core and the stator iron core respectively, and a winding is arranged on the stator iron core; a base middle partition plate is arranged between the stator iron core and the base, a cooler for realizing a cooling effect is further arranged above the base, an inner fan is arranged inside the base to circulate air flow in the base, and the air flow is cooled by the cooler to form a circulating cooling for the inside of the base, so that heat is taken away to realize motor cooling.
[0003] However, the heat exchange mode of the existing three-phase asynchronous motor has the following problems:
[0004] 1. The width of the stator iron core radial air duct and the rotor iron core radial air duct of the three-phase asynchronous motor is large, which causes the air duct to be wide, the total number of air ducts is small, and the contact area with cooling air is small under the condition that the total iron core length is unchanged, which leads to poor heat dissipation effect and easy high temperature rise of the motor; and too many air ducts can easily cause the total length of the iron core and the base to be too long.
[0005] 2. The hot air flowing out of the stator iron core radial air duct is limited by space and has a small flow gap during entering the winding end, which leads to large air resistance and small air volume in the base, and easily causes high temperature rise of the motor.
[0006] 3. The rotor adopts a welded rib shaft (four or six ribs 19 are welded in the circumferential direction of the circular shaft), and the rotor iron core axial air duct is actually composed of the circular shaft, the rib, and the inner wall of the rotor iron core. Since the three surfaces of the rotor iron core axial air duct are circumferential surfaces, and the rib itself is not easy to heat, only one surface of the rotor iron core heats, which leads to poor heat dissipation effect of the rotor iron core of this structure; and the welded rib shaft needs to be machined in the outer diameter of the circular shaft, the rib is cut, and then the welding, annealing and other processes are carried out, which has the defects of long cycle and high cost. CONTENT OF THE UTILITY MODEL
[0007] The utility model aims at providing a high-voltage high-efficiency high-power density three-phase asynchronous motor, which can effectively improve the motor heat dissipation effect, reduce the motor stator temperature rise and the motor internal temperature, and improve the motor power density and the motor efficiency.
[0008] The utility model adopts the following technical scheme:
[0009] 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.
[0010] The width of the radial ventilation channel in the stator core and the radial ventilation channel in the rotor core is 4mm-6mm.
[0011] The flow hole is an elongated hole arranged in a left-right direction and penetrating the middle partition of the machine base.
[0012] The flow channel is an arc-shaped channel.
[0013] The position of the guide plate is adapted to the position of the guide channel near the end of the winding.
[0014] The aforementioned guide plate forms a frustum-shaped cover inside the base.
[0015] The rotor adopts an optical axis, and several axial ventilation channels of the rotor core are evenly distributed along the circumference of the rotor.
[0016] 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.
[0017] 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.
[0018] 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.
[0019] The utility model discloses a radial ventilation channel, flow hole and guide flow channel of stator and rotor iron core are optimized and design, cooperate with the optical axis rotor that rotor iron core axial ventilation channel is provided, can make the heat dissipation of high pressure high efficiency high power density three phase asynchronous motor greatly improve, effectively reduced motor stator temperature rise, improved motor power density, shortened production cycle, and the temperature reduction of motor inside makes the further reduction of stator rotor iron loss, copper consumption, makes the further promotion of motor efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 It is three phase asynchronous motor structure and wind path structure schematic diagram in the utility model. DETAILED DESCRIPTION
[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, and all other embodiments obtained by the person skilled in the art without creative labor based on the embodiments in the utility model belong to the protection scope of the utility model.
[0022] As Figure 1 The utility model discloses a high pressure high efficiency high power density three phase asynchronous motor, including frame 1 and the rotor and stator of setting in frame 1, the both ends of rotor are rotatably connected with frame 1, and the stator is set on the outside of rotor and is fixed with the inner wall of frame 1, rotor iron core 2 and stator core 3 have air gap 20 between, and a plurality of groups of rotor iron core radial ventilation channel 4 and stator core radial ventilation channel 5 are arranged on rotor iron core 2 and stator core 3 respectively, are used to form ventilation air path to cool motor rotor and stator, and stator core 3 is provided with winding.
[0023] In the utility model, frame 1 top is still provided with the cooler 8 for realizing cooling function, and the cooler 8 contains built-in cooling pipe 9 and cooling pipe outer air duct 10, and the air inlet of cooling pipe 9 is communicated with the outer fan 13 outside one side frame 1 of winding terminal 16 through air duct 11 and end cover 12, and the air outlet of cooling pipe 9 is communicated with the outside.
[0024] The external cold wind passes through outer fan 13, end cover 12 and air duct 11 and enters cooling pipe 9, and the cold wind in cooling pipe 9 exchanges heat with the hot wind outside cooling pipe 9, and the cold wind in cooling pipe 9 is changed into hot wind after absorbing heat and is discharged outside frame 1, forming outer air path channel.
[0025] The utility model discloses, the inner fan 14 is arranged in the frame 1 of one side of winding end 6, and the frame middle partition 7 is arranged between the left and right sides of stator core 3 top and frame 1 top inner wall, and the flow hole 21 is arranged on the frame middle partition 7 of one side of winding end 6, and the above-mentioned structure can make the hot air of stator core radial air passage 5 directly enter winding end 6 through flow hole 21, effectively solve the defect that the hot air of stator core radial air passage 5 can only enter winding end 6 through the gap 18 between frame middle partition 7 and stator core 3 in the prior art, thereby solve the defect that the wind resistance in frame 1 is big, and the air volume is small.
[0026] The utility model discloses, the lower part of cooler 8 top of stator core 3 still is provided with the flow channel 22, and the lower end plate of cooler 8 in the covering range of flow channel 22 and the upper end plate of frame 1 can evenly set up multiple flow guide holes between, and the flow channel 22 is communicated with the inner chamber of frame 1 top of stator core 3 through flow guide hole;The design of above-mentioned flow channel 22 can form the flow guide effect of the hot air of stator core radial air passage 5 in the lower part of cooler 8, and the hot air flows into flow channel 22 through flow guide hole;
[0027] In order to cooperate with flow channel 22, make the hot air of introduction flow channel 22 reenter winding end 6, form the air path circulation, the utility model discloses, still be provided with the flow guide plate on winding end 6 top, and the flow guide plate can adopt the baffle 23, and the position of baffle 23 is compatible with the position of one side end of flow channel 22 near winding end 6;The setting of baffle 23 can cooperate with the flow hole on the same side frame middle partition and form the flow guide air duct, thereby making the hot air of flow channel 22 and frame middle partition 7 on flow hole 21 flow into winding end 6 smoothly, and realizing the air path circulation in frame 1 through inner fan 14.
[0028] The utility model discloses, the airflow of stator core radial air passage 5 flows and will divide into three sub-branches and flow, and the first sub-branch enters winding end 6 through the gap 18 between frame middle partition 7 and stator core 3;The second sub-branch enters winding end 6 through the flow hole 21 on frame middle partition 7;The third branch enters winding end 6 through the flow channel 22 on stator core 3 top;Three sub-branches finally all realize the inner air path circulation in frame 1 through inner fan 14.
[0029] In order to can under the condition that the total length of core is invariable, the total number of stator core radial air passage 5 and rotor core radial air passage 4 is improved as far as possible, and the contact area of above-mentioned air passage and cooling air is increased as far as possible, and the width of stator core radial air passage 5 and rotor core radial air passage 4 is set at 4mm-6mm in the embodiment, and preferably 5mm;
[0030] Compared with the structural design of the traditional high-voltage high-efficiency high-power-density three-phase asynchronous motor, the width of the ventilation channel is reduced from 10mm to 5mm, the number of the stator core radial ventilation channel 5 and the rotor core radial ventilation channel 4 can be effectively increased without changing the total core length, so that the contact area of the ventilation channel with the cooling air is increased, and experimental measurement shows that the motor stator temperature rise can be reduced by 2-4℃.
[0031] In the embodiment, the flow-through hole 21 is a long circular hole arranged left and right and penetrating the middle partition plate 7 of the machine base; the flow guide channel 22 can be an arc-shaped channel, and the wind baffle 23 forms a circular truncated cone cover inside the machine base 1.
[0032] Through the optimization design of the flow-through hole 21 and the flow guide channel 22, the hot air in the machine base 1 enters the cooling pipe outer air duct 10 through the inner fan 14, the hot air outside the cooling pipe 9 exchanges heat with the cold air inside the cooling pipe 9, the hot air outside the cooling pipe 9 becomes cold air after entering the machine base 1 from one side of the winding connection end 16, and then divides into two branches after the winding connection end 16: the first branch enters the stator core radial ventilation channel 5 through the air gap 20, and the second branch enters the rotor core radial ventilation channel 4 and the stator core radial ventilation channel 5 through the rotor core axial ventilation channel 17; the hot air flowing out of the stator core radial ventilation channel 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 machine base middle partition plate 7 and the stator core 3; the second sub-branch enters the winding end 6 through the flow-through hole 21 arranged on the machine base middle partition plate 7; the third sub-branch enters the winding end 6 through the flow guide channel 22 above the stator core 3; finally, the three sub-branches realize the inner air circulation in the machine base 1 through the inner fan 14. The above-mentioned optimized air path design can further reduce the air resistance of the hot air flowing out of the stator core radial ventilation channel 5 during the flow process, thereby enhancing the heat dissipation effect. Experimental measurement shows that the motor stator temperature rise can be reduced by 3-4℃;
[0033] In the embodiment, the rotor adopts a light shaft and no longer uses a welded shaft; a plurality of rotor core axial ventilation channels 17 are arranged on the rotor in the circumferential direction. The rotor core axial ventilation channel 17 directly passes through the rotor core 2, the ventilation contact area is large, the cooling effect is obvious, and experimental measurement shows that the motor stator temperature rise can be reduced by 3-5℃; at the same time, the manufacturing period of the rotor shaft is shortened by about 10 days.
[0034] The utility model discloses a high -pressure high -efficient high -power density three -phase asynchronous motor of the rotor iron core axial air passage 17's optical axis rotor is cooperatively arranged to the optimization design of the stator and rotor iron core radial air passage 4, flow -through hole 21 and guide flow passage 22, can make high -pressure high -efficient high -power density three -phase asynchronous motor's heat dissipation get the great improvement, effectively reduced motor stator temperature rise, improved motor power density, shortened production cycle, the temperature reduction in the motor inside makes the rotor iron loss, copper consumption get further reduction, makes motor efficiency get further promotion to the high -pressure high -efficient high -power density characteristic of high -pressure high -efficient high -power density three -phase asynchronous motor of the ultimate realization.
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 guide plate is adapted to the position of the 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 aforementioned guide plate 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.