Asymmetric axial partition hydro-generator cooling air path

Abstract

The invention relates to the technical field of hydro-generator cooling, in particular to an asymmetric axial partition hydro-generator cooling air path. A rotor inter-pole baffle is arranged on one side, close to a stator core, of a magnetic pole, and a plurality of air holes are formed in the rotor inter-pole baffle; the rotor inter-pole baffle is suitable for blocking airflow facing the magnetic poles in the stator iron core, and the air holes are suitable for enabling the airflow to enter the stator iron core from the magnetic poles; and the air holes are formed in positions where airflow entering the stator iron core from the air holes does not hedge existing airflow in the stator iron core. Convergence of wind paths is reduced, and energy loss can be avoided. A baffling loop of airflow is formed in the stator iron core and the stator base, and the utilization rate of the airflow used for cooling is increased.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine generator cooling, and in particular to an asymmetric axially partitioned water turbine generator cooling air path. Background Art

[0002] In existing evaporatively cooled turbine generator sets, the stator winding is cooled by evaporation, while the rotor and stator core are cooled by air. Figure 1 As shown, when the rotor and stator core are cooled by air, the conventional air path is pure radial ventilation or axial radial mixing with yoke fans arranged at the upper and lower ends of the yoke, and most of the air paths are symmetrical. When the air paths converge, the airflows in the symmetrical air paths will form an offset, thereby generating unnecessary energy losses. Summary of the invention

[0003] In view of this, the present invention provides an asymmetric axially partitioned hydro-turbine generator cooling air path to solve the problem that the cooling air flow utilization rate in the existing cooling air path in a specific motor is relatively low and the heat dissipation requirements cannot be met.

[0004] The present invention provides an asymmetric axial partitioned water turbine generator cooling air path, which is arranged in the water turbine generator, the water turbine generator comprises a motor shaft and a foundation pit arranged around the motor shaft, and at least a rotor support, a rotor yoke, a magnetic pole, a stator core and a stator base are arranged in the foundation pit along the radial direction of the motor shaft, including:

[0005] A partitioned windshield is arranged on a side of the stator base away from the motor shaft, the partitioned windshield has an opening toward the stator base, the bottom end of the partitioned windshield is lower than the bottom end of the stator base, and the partitioned windshield is divided into a plurality of windshield sub-areas;

[0006] The stator frame is divided into a plurality of frame sub-areas, and the frame sub-areas are arranged corresponding to the wind shield sub-areas, so that the airflow flows between the frame sub-areas and the wind shield sub-areas;

[0007] A rotor inter-pole baffle is provided on one side of the magnetic pole close to the stator core, and a plurality of air holes are provided on the rotor inter-pole baffle;

[0008] The rotor interpolar baffle is suitable for blocking the airflow in the stator core toward the magnetic pole, and the air hole is suitable for allowing the airflow to enter the stator core from the magnetic pole;

[0009] The airflow entering the stator core from the air holes does not conflict with the existing airflow in the stator core.

[0010] In the present application, the airflow flows from the rotor support to the stator base under the driving force provided by the rotor pressure head, and then flows to the partition wind shield after passing through the wind hole. Under the blocking effect of the partition wind shield, the airflow flows from the stator base to the stator core, and then under the blocking effect of the rotor interpolar baffle, it can form a return in the stator core and the stator base, and the airflow forms a folding loop in the stator core and the stator base, and finally flows out of the partition wind shield from the lower position of the stator base toward the rotor support. The present application reduces the convergence of the wind path and can avoid energy loss. The folding loop of the airflow is formed in the stator core and the stator base, which increases the utilization rate of the airflow for cooling.

[0011] In an optional embodiment, the wind shield sub-area at the lowest position corresponds to the machine base sub-area at the lowest position and the space below the stator machine base, and the wind shield sub-area above the lowest position corresponds to two adjacent machine base sub-areas, so that the gas flow between two adjacent machine base sub-areas is opposite, thereby increasing the utilization rate of the airflow for cooling.

[0012] In an optional embodiment, a rotor interpole baffle is provided on one side of the magnetic pole close to the stator core, the rotor interpole baffle is axially arranged between two adjacent magnetic poles, and a plurality of air holes are provided on the rotor interpole baffle;

[0013] The rotor interpolar baffle is suitable for blocking the airflow in the stator core toward the magnetic pole, and the air hole of the rotor interpolar baffle is suitable for allowing the airflow from the magnetic pole to enter the stator core to pass through and making the airflow entering the stator core from the air hole not collide with the airflow in the stator core, so as to form a baffle between the stator core and the stator frame.

[0014] In an optional embodiment, an upper fan is provided on the upper end side of the rotor yoke, and a lower fan is provided on the lower end side of the rotor yoke. The upper fan and the lower fan can respectively accelerate the airflow flowing from the rotor bracket to the stator frame at the upper and lower ends of the rotor yoke.

[0015] In an optional embodiment, a lower baffle is provided at the lower end side of the magnetic pole, and the lower baffle is suitable for directing the airflow from the lower end side of the rotor yoke toward the magnetic pole into the magnetic pole along an upward inclination angle. The lower baffle can allow the airflow to cool the end of the magnetic pole winding located outside the magnetic pole, and the airflow has an axial component, which can increase the wind volume above the magnetic pole.

[0016] In an optional embodiment, a condenser is provided on the upper end side of the stator frame, and the condenser is suitable for cooling the stator winding.

[0017] In an optional embodiment, an air cooler is provided on one end of the stator frame near the partition wind shield, and the air cooler is located on the inner side of the partition wind shield. The airflow from the stator frame to the partition wind shield can be cooled by the air cooler, and then bends the stator core to enhance the cooling effect.

[0018] In an optional embodiment, the condenser is arranged on an end of the stator frame away from the motor shaft. The condenser can block the airflow above the stator frame and make it flow downward.

[0019] In an optional embodiment, a through hole is provided at the top of the stator frame, and the through hole is located between the stator core and the condenser. The through hole allows the airflow blocked by the condenser to flow into the stator frame.

[0020] In an optional implementation, the air cooler and the condenser share a water system, which can reduce the number of pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the prior art structure;

[0023] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the position of the air holes in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Motor shaft; 2. Rotor bracket; 3. Foundation pit; 4. Rotor yoke; 5. Magnetic pole; 6. Stator core; 7. Stator frame; 8. Partition wind shield; 9. Radial wind shield; 10. Radial spoke plate; 11. Rotor interpole baffle; 12. Air hole; 13. Upper fan; 14. Lower fan; 15. Lower baffle; 16. Condenser; 17. Air cooler; 18. Through hole; 19. Pole winding. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] In existing evaporatively cooled turbine generator sets, the stator winding is cooled by evaporation, while the rotor and stator core are cooled by air. Figure 1 As shown in the figure, there are both air cooler water circuit and condenser water circuit in the motor, which makes the pipe connection complicated and inconvenient for maintenance. In order to reduce the pipe connection, some studies have proposed a condensation cooling integrated structure, where the condenser and air cooler share a water circuit. In order to ensure the evaporative cooling cycle power, the condenser is generally placed at a high position, resulting in obstruction of the original air circuit. The flow rate of the original air circuit is reduced and cannot meet the heat dissipation requirements of the motor.

[0029] For large-capacity evaporative cooling hydro-turbine generators, the slip ring current is relatively high, and the conventional air path is pure radial ventilation or an axial radial mixture with yoke fans arranged at the upper and lower ends of the yoke, and most of the air paths are symmetrical. The slip ring cooling air volume only accounts for 50% of the total air volume, which cannot meet the heat dissipation requirements of the slip ring.

[0030] The ventilation structure in the existing generator is not suitable for the situation where the upper end of the stator frame is blocked.

[0031] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0032] According to an embodiment of the present invention, an asymmetric axial partitioned hydro-turbine generator cooling air path is provided, which is arranged in a hydro-turbine generator, wherein the hydro-turbine generator comprises a motor shaft 1 and a foundation pit 3 arranged around the motor shaft 1, wherein at least a rotor support 2, a magnetic pole 5, a stator core 6 and a stator frame 7 are arranged in the foundation pit 3 along the radial direction of the motor shaft 1, and comprises:

[0033] A partition windshield 8 is arranged on a side of the stator base 7 away from the motor shaft 1. The partition windshield 8 has an opening toward the stator base 7. The bottom end of the partition windshield 8 is lower than the bottom end of the stator base 7 and there is a gap between the bottom end of the partition windshield 8 and the bottom end of the stator base 7, so that airflow can flow out from the bottom end of the stator base 7. The partition windshield 8 is divided into a plurality of windshield sub-areas. It should be noted that, except for the bottom position, the partition windshield 8 should be sealed and connected to the stator base 7 to prevent airflow from flowing out from the top or the left and right sides.

[0034] The stator frame 7 is divided into a plurality of frame sub-areas, and the frame sub-areas are arranged corresponding to the wind shield sub-areas, so that the airflow flows between the frame sub-areas and the wind shield sub-areas;

[0035] Specifically, a plurality of radial windshield plates 9 may be provided inside the partition windshield 8. A plurality of radial spokes 10 are provided on the stator base 7; the radial windshield plates 9 are suitable for dividing the partition windshield 8 into a plurality of windshield sub-areas, and the radial spokes 10 are suitable for dividing the stator base 7 into a plurality of base sub-areas. The plate surfaces of the radial windshield plates 9 and the radial spokes 10 may be regarded as being perpendicular to the motor shaft, such as Figure 2 As shown, the radial wind shield 9 and the radial spoke 10 are arranged horizontally. The stator frame 7 can be regarded as being composed of spokes.

[0036] A rotor inter-pole baffle 11 is provided on one side of the magnetic pole 5 close to the stator core 6, and a plurality of air holes 12 are provided on the rotor inter-pole baffle 11;

[0037] The rotor interpolar baffle 11 is suitable for blocking the airflow in the stator core 6 toward the magnetic pole 5, and the air hole 12 is suitable for allowing the airflow to enter the stator core 6 from the magnetic pole 5;

[0038] The air hole 12 is provided at a position where the airflow entering the stator core 6 from the air hole 12 does not collide with the existing airflow in the stator core 6 .

[0039] In the present application, the airflow flows from the rotor support 2 to the stator frame 7 under the driving force provided by the rotor pressure head, and then flows to the partition wind shield 8 after passing through the wind hole 12. Under the blocking effect of the partition wind shield 8, the airflow flows from the stator frame 7 to the stator core 6, and then under the blocking effect of the rotor interpolar baffle 11, a return can be formed in the stator core 6 and the stator frame 7, and the airflow forms a folding loop in the stator core 6 and the stator frame 7, and finally flows out of the partition wind shield 8 from the lower position of the stator frame 7 toward the rotor support 2. The present application reduces the convergence of the wind path and can avoid energy loss. The folding loop of the airflow is formed in the stator core 6 and the stator frame 7, which increases the utilization rate of the airflow for cooling.

[0040] It should be noted that the rotor support 2 inside the foundation pit 3 has a plurality of plates adjacent to each other and arranged in parallel at intervals, and the plates are provided with connecting holes for airflow to pass through, and the plurality of plates divide the internal space of the rotor support 2 into different air ducts, and the airflow in different air ducts cools different components or different positions on the same component. The rotor support 2 is provided with a rotor core, and a reducer is provided at the bottom of the rotor core; a stator core is provided on the side of the stator base close to the rotor support 2, and a stator winding is provided on the stator core; a magnetic pole 5 is provided between the stator core and the rotor core, and a magnetic pole winding 19 is provided on the magnetic pole 5. Since the cooling air path of the hydro-turbine generator in the present application is improved based on the existing hydro-turbine generator structure, the rotor support 2, stator base, rotor core, reducer, stator core, stator winding, magnetic pole 5 and magnetic pole winding 19 structures thereof are all the same as the existing hydro-turbine generator structure, and will not be repeated here. The following content will describe in detail the differences between the asymmetric axially partitioned hydro-turbine generator cooling air path in the present application and the hydro-turbine generator structure in the prior art.

[0041] In an optional embodiment, the wind shield sub-area at the lowest position corresponds to the machine base sub-area at the lowest position and the space below the stator machine base 7, and the wind shield sub-area above the lowest position corresponds to two adjacent machine base sub-areas, so that the gas flow between two adjacent machine base sub-areas can be opposite, thereby increasing the utilization rate of the airflow for cooling.

[0042] If the number of axial partitions of the stator base 7 is n, and n is an odd number, it is ensured that the airflow direction in the highest base sub-area and the lowest base sub-area should flow from the inner diameter of the stator into the outer diameter of the stator.

[0043] The radial spokes 10 in the stator frame 7 can cooperate with the partition wind shield 8 to achieve n axial partitions. The number of radial wind shields 9 in the partition wind shield 8 should be n-1 / 2.

[0044] In an optional embodiment, the rotor interpolar baffle 11 is axially arranged between two adjacent magnetic poles 5; wherein, the magnetic pole 5 is axially provided with a plurality of rotor coils, the gap between the magnetic pole 5 in the circumferential direction is the interpolar air gap, and the gap between the rotor and the stator is the air gap.

[0045] In the present application, the circumferential direction, radial direction and axial direction are generally based on the motor shaft 1 .

[0046] Specifically, the air holes 12 of the rotor interpolar baffle 11 are suitable for allowing the airflow from the magnetic pole 5 to enter the stator core 6 to pass through and for preventing the airflow entering the stator core 6 from the air holes 12 from colliding with the existing airflow in the stator core 6. This can form a baffle between the stator core 6 and the stator frame 7. Figure 2As shown, air holes 12 are provided at the upper and lower ends of the rotor interpolar baffle 11, and the number of the machine base sub-areas is three. The airflow enters the uppermost machine base sub-area through the air holes 12, and is deflected into the second machine base sub-area under the action of the partition wind shield 8, and flows through the stator iron core 6 to the rotor interpolar baffle 11, forming the existing airflow in the stator iron core 6. Then, the position on the rotor interpolar baffle 11 opposite to the second machine base sub-area is no longer provided with air holes 12, so as to prevent the airflow from entering from the air holes 12 and colliding with the existing airflow in the stator iron core 6. The airflow is deflected into the machine base sub-area at the bottom layer under the obstruction of the rotor interpolar baffle 11, and flows out from the wind shield sub-area at the bottom layer. Among them, the existing airflow in the uppermost and lower machine base sub-areas is far away from the rotor interpolar baffle 11, so the air holes 12 arranged opposite to the uppermost and lower machine base sub-areas can be respectively provided on the rotor interpolar baffle 11.

[0047] The air holes 12 of the rotor interpolar baffle 11 should be divided into zones. The ventilation grooves in the stator area corresponding to the rotor area flow radially outward. The air holes 12 of different sizes, numbers and shapes can be set, and the relevant parameters can be determined by air path calculation.

[0048] The air holes 12 of the rotor interpolar baffle 11 can be arranged at the upper and lower ends of the magnetic pole 5, suitable for allowing the airflow entering the stator core 6 from the upper and lower ends of the magnetic pole 5 to pass through. In addition to being arranged at both ends of the rotor interpolar baffle 11, the air holes 12 can also be arranged between the two ends of the rotor interpolar baffle 11, and it is necessary to avoid colliding with the airflow direction in the stator wind groove. The surface of the rotor interpolar baffle 11 can be smooth, and cooperate with the pole shoes of the magnetic pole 5 to realize the rotor hidden polarization and reduce ventilation loss.

[0049] In an optional embodiment, an upper fan 13 is provided on the upper end side of the rotor yoke 4, and a lower fan 14 is provided on the lower end side of the rotor yoke 4. The upper fan 13 and the lower fan 14 can respectively accelerate the airflow flowing from the rotor bracket 2 to the stator frame 7 at the upper and lower ends of the rotor yoke 4.

[0050] In an optional embodiment, a lower baffle 15 is provided at the lower end side of the magnetic pole 5, and the lower baffle 15 is suitable for allowing the airflow from the lower end side of the rotor yoke 4 toward the magnetic pole 5 to enter the magnetic pole 5 along an upward inclination angle. The lower baffle 15 can allow the airflow to cool the magnetic pole winding 19 located outside the magnetic pole 5, and make the airflow have an axial component, which can increase the air volume above the magnetic pole 5. The lower baffle 15 can have a baffle with an upward inclination toward the magnetic pole winding 19, so that the airflow enters the magnetic pole winding 19 outside the magnetic pole 5.

[0051] In an optional embodiment, a condenser 16 is provided on the upper end side of the stator frame 7, and the condenser 16 is suitable for cooling the stator winding. The stator evaporative cooling technology is generally self-circulating at room temperature, and the condenser 16 should be higher than the stator winding to provide sufficient gravity to drive the evaporative cooling system to self-circulate. The condenser 16 can adopt plate or tube cooling technology, and the shape can be rectangular. It can be arranged above the air cooler 17, and multiple condensers 16 can be arranged circumferentially to block the wind path from entering the foundation pit 3. If the condenser 16 cannot block the wind path from entering the foundation pit 3, a circumferential baffle can be set. The top of the condenser 16 can be connected to the foundation pit 3.

[0052] In an optional embodiment, an air cooler 17 is provided on one end of the stator frame 7 close to the partition wind shield 8, and the air cooler 17 is located on the inner side of the partition wind shield 8. The airflow flowing from the stator frame 7 to the partition wind shield 8 can be cooled by the air cooler 17, and then bends the stator core 6 to enhance the cooling effect.

[0053] The air holes 12 and through holes 18 of the present application may be regular or irregular in shape, and circular holes, waist-round holes, rectangular holes, etc. are commonly used.

[0054] In an optional embodiment, the condenser 16 is disposed on an end of the stator frame 7 away from the motor shaft 1. The condenser 16 can block the airflow above the stator frame 7 and make it flow downward.

[0055] In an optional embodiment, a through hole 18 may be provided on the top radial plate of the stator frame 7, and the through hole 18 is located between the stator core 6 and the condenser 16. The through hole 18 allows the airflow blocked by the condenser 16 to flow into the stator frame 7. The through holes 18 may be arranged along the circumference of the stator frame 7 and evenly distributed, and the size, number and shape of the through holes 18 may be different, and the relevant parameters may be determined by air path calculation.

[0056] In an optional embodiment, the condenser 16 is placed above the air cooler 17, and the air cooler 17 and the condenser 16 share a water system, which can reduce the number of pipelines.

[0057] The adjacent stator core 6 sections of the stator core 6 are supported by stator slot steels, and the space of the stator slot steels forms a stator ventilation groove. The airflow passes through the stator core 6 through the stator ventilation groove, thereby fully cooling the stator core 6.

[0058] Pressure plates are arranged at both ends of the stator, and the two pressure plates can be connected by tightening screws. After the pressure plates at both ends are connected by tightening screws, all the six sections of the stator core form a whole.

[0059] Working principle: The air flows out of the air cooler 17 under the driving force provided by the rotor pressure head to form a downwind path. The downwind path flows through the lower end of the stator winding, enters the rotor bracket 2 through the connecting hole on the flat plate, and then is divided into three paths.

[0060] The first path is accelerated by the lower fan 14 and flows through the lower end of the pole winding 19 , and the pole winding 19 is cooled axially by the action of the rotor interpolar baffle 11 .

[0061] The second path flows radially into the interpolar air gap between two adjacent rotors under the action of the rotor pressure head to cool the magnetic pole winding 19. The first two paths merge in the air gap and flow radially into the air hole 12 or axially out of the upper part of the magnetic pole winding 19 under the action of the rotor interpolar baffle 11.

[0062] Under the action of the upper fan 13, the third airflow flows out from the connecting hole on the rotor bracket 2, cools the upper end of the magnetic pole winding 19, and merges with the first two airflows at the upper end of the magnetic pole winding 19. Then, it passes through the upper end of the stator winding and flows into the stator frame 7 through the through hole 18 on the stator frame 7. The radial spokes 10 of the stator frame 7 and the radial wind shield 9 of the partition wind shield 8 cooperate with each other to axially partition the stator area, that is, the area where the stator core 6 and the stator frame 7 are located. The airflow coming from the air hole 12 and radially flowing from the stator core 6 into the stator frame 7 merges with the airflow flowing from the through hole 18 on the stator frame 7, and under the action of the radial spokes 10 of the stator frame 7 and the radial wind shield 9 in the partition wind shield 8, it flows from the outer edge of the stator to the inner edge of the stator, and flows downward under the action of the rotor interpolar baffle 11 and the upper fan pressure head. Under the action of the rotor pressure head, the air flows from the inner edge of the stator to the outer edge of the stator, and is evenly cooled by multiple deflections. Finally, the air flows out from the air cooler 17 to achieve circulating cooling.

[0063] The present application solves the problem of the condenser 16 blocking the air path after cooling integration.

[0064] The single-direction cooling air path improves the air cooling utilization rate and heat dissipation efficiency, reduces the unnecessary energy loss caused by airflow collision in the symmetrical air path, and is also beneficial to reduce the motor wind friction loss and improve the temperature uniformity of the motor.

[0065] When the stator evaporative cooling fails, the temperature of the upper end of the stator winding is often the highest. Secondly, for large-capacity hydro-turbine generators, there is a heat dissipation problem in the lead wire. In this wind path, the wind path has a single flow direction, which increases the cooling air volume for the upper winding end and the merge ring of the stator winding and improves the cooling effect.

[0066] The present application optimizes the rotor cooling structure: the wind shield on the rotor is removed, and the structure of the rotor bracket 2 is modified to adapt to the new wind path system.

[0067] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An asymmetric axially partitioned cooling air path of a hydro-turbine generator, arranged in a hydro-turbine generator, the hydro-turbine generator comprising a motor shaft (1) and a foundation pit (3) arranged around the motor shaft (1), wherein at least a rotor support (2), a rotor yoke (4), a magnetic pole (5), a stator core (6) and a stator base (7) are arranged in the foundation pit (3) along the radial direction of the motor shaft (1), characterized in that: include: A partitioned wind shield (8) is arranged on a side of the stator base (7) away from the motor shaft (1), the partitioned wind shield (8) having an opening facing the stator base (7), a bottom end of the partitioned wind shield (8) lower than a bottom end of the stator base (7), and the partitioned wind shield (8) is divided into a plurality of wind shield sub-areas; The stator base (7) is divided into a plurality of base sub-areas, and the base sub-areas are arranged corresponding to the wind shield sub-areas, so that air flows between the base sub-areas and the wind shield sub-areas; A rotor inter-pole baffle (11) is provided on one side of the magnetic pole (5) close to the stator core (6), and a plurality of air holes (12) are provided on the rotor inter-pole baffle (11); The rotor interpolar baffle (11) is suitable for blocking the airflow in the stator core (6) toward the magnetic pole (5), and the air hole (12) is suitable for allowing the airflow to enter the stator core (6) from the magnetic pole (5); The airflow entering the stator core (6) from the air hole (12) does not collide with the existing airflow in the stator core (6).

2. The cooling air duct according to claim 1, characterized in that: The windshield sub-area at the lowest position corresponds to the machine base sub-area at the lowest position and the space below the stator machine base (7), and the windshield sub-areas above the lowest position correspond to two adjacent machine base sub-areas.

3. The cooling air duct according to claim 1, characterized in that: The rotor interpolar baffle (11) is axially arranged between two adjacent magnetic poles (5).

4. The cooling air duct according to claim 1, characterized in that: An upper fan (13) is provided on the upper end side of the rotor yoke (4), and a lower fan (14) is provided on the lower end side of the rotor yoke (4).

5. The cooling air duct according to claim 1, characterized in that: A lower baffle (15) is provided at the lower end side of the magnetic pole (5), and the lower baffle (15) is suitable for allowing the airflow from the lower end side of the rotor yoke (4) toward the magnetic pole (5) to enter the magnetic pole (5) along an upward inclination angle.

6. The cooling air duct according to claim 1, characterized in that: A condenser (16) is provided on the upper end side of the stator frame (7), and the condenser (16) is suitable for cooling the stator winding.

7. The cooling air duct according to claim 1, characterized in that: An air cooler (17) is provided on one end of the stator frame (7) close to the partition wind shield (8), and the air cooler (17) is located on the inner side of the partition wind shield (8).

8. The cooling air duct according to claim 6, characterized in that: The condenser (16) is arranged on an end of the stator frame (7) away from the motor shaft (1).

9. The cooling air duct according to claim 6, characterized in that: The top radial plate of the stator frame (7) is provided with a through hole (18), and the through hole (18) is located between the stator core (6) and the condenser (16).

10. The cooling air duct according to claim 7, characterized in that: The air cooler (17) and the condenser (16) share a water system.

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