Method for improving surface cooling effect of hydro-generator pole winding

Abstract

The invention belongs to the technical field of cooling of high-rotating-speed and high-capacity hydraulic generators and pumped storage generator motors, and particularly relates to a method for improving the surface cooling effect of a magnetic pole winding of a hydraulic generator. Cooling air is introduced from the magnet yoke, wherein the cooling air is divided into two paths; after the first path of cooling air enters the axial air duct on the outer surface of the interelectrode, the air speed is gradually increased when the two end areas reach the middle area; the second path of cooling air is divided into a first part of cooling air and a second part of cooling air after entering from a radial air duct between magnet yoke sections of the magnet yoke; the first part of cooling air passes through an inner side air guide structure in the end part area, enters an inner surface radial air duct and then leaves from the outer supporting plate; the second part of cooling air passes through the radial ventilation holes of the interelectrode space separation device in the middle area, and the air speed is gradually increased in the process of leaving from the inner diameter to the outer diameter along the radial air channel of the interelectrode outer surface; the problem of temperature rise uniformity of the magnetic pole is solved, and the problem of thermal deformation discordance of the magnetic pole winding is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling high-speed and large-capacity hydroelectric generators and pumped-storage power generation motors, and in particular relates to a method for improving the cooling effect of the surface of a hydroelectric generator magnetic pole winding. Background Art

[0002] When the rotor of the hydro-turbine generator rotates in a certain direction, the cooling condition of the windward side of the outer side of the pole winding is better than that of the leeward side. The temperature rise of the leeward side is often higher than that of the windward side, resulting in a large temperature difference on both sides of the pole winding. Moreover, along the cooling path of the outer surface of the pole winding, as the heat exchange proceeds, the temperature of the cooling air gradually rises, resulting in a decrease in the heat exchange effect. Often, the temperature in the middle of the same winding is higher than that at the end, and the temperature on the outer diameter side is higher than that on the inner diameter side. This is an inevitable problem of temperature rise uniformity caused by the inherent structure of the rotor, which can easily lead to the problem of uncoordinated thermal deformation of the pole winding. This problem is more prominent for high-speed, large-capacity generators and pumped-storage generator motors in major national hydropower projects with clear long-term plans.

[0003] For example, a Chinese patent with application number 202210047026.6 and application date January 17, 2022, is named "A cooling structure for the pole winding of a salient-pole synchronous motor". Its technical solution is as follows: The present invention sets a radial flow channel in the middle of the pole winding, and sets a guide block between the poles. The cooling gas flowing out of the yoke ventilation groove forms three directional ventilation and cooling air paths after passing through the guide block. The first path enters the radial flow channel of the pole winding on one side of the guide block, the second path enters the radial flow channel of the pole winding on the other side of the guide block, and the third path enters between the two poles through the air guide hole to cool the outer surface of the pole winding.

[0004] The above patent achieves the effect of adjusting the air volume distribution of the inner cooling and the outer surface cooling by setting the guide block, so that the overall temperature distribution of the pole winding is more uniform. However, the above patent only achieves the uniform temperature distribution of the pole winding by changing the air volume distribution size, which is not obvious. Since the change in the air volume does not change the convection heat transfer coefficient, when the cooling air flows toward the outer diameter of the pole winding, the cooling air will heat up due to heat exchange, so that the heat exchange capacity gradually decreases during the cooling of the pole winding by the cooling air, resulting in a greatly weakened effect of achieving uniform temperature distribution of the pole as a whole during the entire cooling process; in addition, The inter-pole spacing is large, and the wind speed of the inter-pole radial cooling wind gradually decreases during the process from the inner diameter to the outer diameter, the temperature rise continues to increase, and the cooling capacity decreases; and, the radial ventilation effect of the heat dissipation turn structure is not as good as the axial ventilation cooling effect; in addition, after calculation and analysis, if the radial ventilation effect of the heat dissipation turn structure is to be improved, then the length of the heat dissipation turn extending to the inter-pole and the distance between the two heat dissipation turns must be strictly controlled, otherwise, the cooling air will find it difficult to flow around the space between the heat dissipation turns, thereby affecting the cooling effect. If axial ventilation is used, the length of the heat dissipation turn should be extended while meeting the rigidity conditions, so that the cooling effect is improved. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a method for improving the cooling effect of the surface of the pole winding of a hydro-turbine generator, which can realize the division of the cooling ventilation duct between the windward side and the leeward side of the pole winding, increase the wind speed of the cooling wind passing through the middle part and the outer diameter side surface of the winding, change the convection heat transfer coefficient, and weaken the difference in cooling effect between the middle part and the end part, the inner diameter side and the outer diameter side of the pole winding due to the front and back space on the cooling path. Moreover, a heat dissipation fin structure and axial ventilation are adopted at both ends to improve the cooling effect of the windward side and the leeward side, the middle end part and the inner and outer diameter side surfaces of the pole winding of the hydro-turbine generator.

[0006] In order to achieve the above technical effects, the technical solution of the present invention is as follows: A method for improving the cooling effect of the surface of a hydro-generator magnetic pole winding comprises the following specific steps: Step s1: Cooling air is introduced from the magnetic yoke, and the cooling air is divided into a first cooling air path and a second cooling air path; the first cooling air path passes through the magnetic pole end wind shields provided at the upper top and lower bottom of the magnetic pole, and is guided into the axial air duct on the outer surface between the poles; the second cooling air path enters directly from the radial air duct between the magnetic yoke segments of the magnetic yoke; Step s2: After the first cooling air enters the axial air duct on the outer surface of the interpole from the upper top and lower bottom of the magnetic pole, the wind speed of the first cooling air increases in the process of reaching the middle area from the two end areas of the magnetic pole, and the first cooling air leaves from the direction from the inner diameter to the outer diameter of the magnetic pole; the axial air duct on the outer surface of the interpole refers to the gap formed along the axial direction of the magnetic pole between the interpole space separator and the magnetic pole winding adjacent to the interpole space separator; Step s3: After the second cooling air enters from the radial air duct between the yoke sections of the yoke, it is divided into a first part of cooling air and a second part of cooling air; wherein the first part of cooling air passes through the inner wind guide structure of the inter-pole space separation device, guides the first part of cooling air into the inner surface radial air duct, and then leaves from the circumferential ventilation grooves on the outer support plate; wherein the second part of cooling air passes through the radial ventilation holes located in the middle area of ​​the pole and opened in the inter-pole space separation device, and leaves from the inner diameter to the outer diameter of the pole along the inter-pole outer surface radial air duct, and the wind speed of the second part of cooling air increases in the process of leaving from the inner diameter to the outer diameter; the inter-pole outer surface radial air duct refers to the gap along the radial direction of the pole formed between the inter-pole space separation device and the pole winding adjacent to the inter-pole space separation device; the inner surface radial air duct is the gap formed between the inner side of the pole winding and the pole core.

[0007] Furthermore, the inter-pole space separation device is arranged on the ventilation and cooling air duct on the outer surface of the pole winding inter-pole along the axial direction of the pole; the ventilation and cooling air duct on the outer surface of the pole winding inter-pole is formed by the gap between the outer surfaces of adjacent pole windings.

[0008] Furthermore, the two end regions are arranged symmetrically in the axial direction, and the axial length of each end region accounts for 1 / 4 to 1 / 3 of the total axial length of the pole winding; from the two end regions to the middle region, the circumferential shape of the inter-pole space separation device in the axial direction of the pole winding is widened in the end region of the pole, so that the wind speed of the first cooling air increases in the process of reaching the middle region from the two end regions of the pole.

[0009] Furthermore, the circumferential shape of the inter-pole space separator widens from the inner side of the inner diameter of the pole winding to the outer side of the outer diameter of the pole winding, so that the wind speed of the second part of the second cooling air increases as it leaves from the inner diameter to the outer diameter.

[0010] Furthermore, along the axial direction of the pole winding, the specific ratio of the space formed by the inter-pole space separator and the surface of the adjacent pole winding is: the ratio of the circumferential space in the two end regions to the circumferential space in the middle region is 1:0.8.

[0011] Furthermore, along the radial direction of the pole winding, the specific ratio of the space formed by the inter-pole space separator and the surface of the adjacent pole winding is: the ratio of the circumferential space on the inner diameter side to the circumferential space on the outer diameter side is 2:1.

[0012] Furthermore, the inter-pole space separation device includes an outer wind guide structure, an inner wind guide structure and a T-tail structure; the outer wind guide structure is arranged between adjacent pole windings along the radial direction of the pole; the inner wind guide structure is arranged between the inner diameter side of adjacent pole windings and the yoke along the circumferential direction of the pole; the T-tail structure is connected to the T-tail groove of the yoke; the outer wind guide structure is arranged on the outer side of the inner wind guide structure, and the outer wind guide structure and the inner wind guide structure are connected to each other; the T-tail structure is arranged on the inner side of the inner wind guide structure, and the T-tail structure is connected to the inner wind guide structure; a plurality of radial ventilation holes are opened in the axial middle area of ​​the inner wind guide structure.

[0013] Furthermore, the outer surface and the inner surface of the inner air guide structure are respectively fitted with the inner diameter inner side surface of the pole winding and the magnetic yoke.

[0014] Furthermore, wind guiding slopes are arranged on both sides of the inner wind guiding structure, and the wind guiding slopes, the magnetic yoke and the magnetic pole core form a wind guiding channel.

[0015] Furthermore, the radial ventilation holes of the inter-pole space separation device in the middle region of the magnetic pole are aligned with the radial air ducts between the yoke segments in the axial direction of the magnetic pole.

[0016] Furthermore, the T-tail structure at the inner diameter side plane of the inter-pole space separator is connected to the T-tail groove of the yoke through a gasket or a wedge key.

[0017] Furthermore, the inter-electrode space separator is made of aluminum alloy.

[0018] Furthermore, the outer diameter side surface of the inter-pole space dividing device is flush with the outer diameter side surface of the magnetic pole winding on the same circumferential surface.

[0019] Furthermore, the pole winding adopts a winding structure with heat dissipation fins, which is formed by welding and molding multiple turns of copper bars with heat dissipation fins. The thickness of the copper bar is K=4~8mm, and the ratio of the heat dissipation fin length L to the adjacent heat dissipation fin spacing H is: L / H=2~3.

[0020] Furthermore, copper bars with heat dissipation fins are arranged at intervals on the multiple turns of copper bars in the axial middle area of ​​the magnetic pole winding.

[0021] Furthermore, the pole winding also includes a copper bar with ventilation fins in the axial middle area, and the copper bar with ventilation fins and the copper bar with heat dissipation fins are alternately arranged along the radial direction of the pole winding; the length Ls of the ventilation fins is L / 3~L / 2.

[0022] Furthermore, the middle region is located in the middle of the ventilation and cooling air duct on the outer surface of the pole winding inter-pole, and the axial length of the middle region accounts for 1 / 3 to 1 / 2 of the total axial length of the pole winding.

[0023] Furthermore, the outer support plate is installed between the outer diameter side of the pole winding and the pole core, and the circumferential ventilation grooves are opened on the outer support plate; the depth of the circumferential ventilation grooves is 1 / 2 of the thickness of the outer support plate, the width is 20~30mm, and the interval between the circumferential ventilation grooves and the edges of the circumferential ventilation grooves is 20~30mm.

[0024] According to the above technical solution, the present invention has the following beneficial effects: 1. In the method of the present invention, the inter-pole space separation device and the adjacent pole windings form radial wind ducts on the inter-pole outer surface and axial wind ducts on the inter-pole outer surface. In the process of cooling the outer surface of the pole winding by flowing in the radial wind ducts on the inter-pole outer surface and the axial wind ducts on the inter-pole outer surface, there will be no effect of different cooling air volumes for actual heat exchange on the windward side and the leeward side. The cooling air volumes on the windward side and the leeward side can be made equivalent, which plays an important role in solving the problem of uniform temperature rise of the poles and avoiding the problem of uncoordinated thermal deformation of the pole windings.

[0025] 2. In the method of the present invention, the specific ratio of the space formed by the inter-pole space separation device and the surface of the adjacent pole winding is: at the same radial position, the ratio of the circumferential space of the two end areas to the circumferential space of the middle area is 1:0.8, and the wind speed of the cooling wind that reaches the middle area and axially passes over the surface of the pole winding can be increased to about 1.25 times that of the end. By increasing the relative wind speed, the convective heat transfer coefficient is changed, and the effect of the cooling air flowing to the middle of the pole winding, which causes the heat exchange capacity with the axial outer surface of the pole winding to be attenuated due to heat exchange and temperature rise, is weakened, thereby reducing the difference in cooling effect between the middle and end parts of the pole winding.

[0026] 3. In the method of the present invention, in the axial middle area, the specific ratio of the space formed by the inter-pole space separation device and the adjacent pole winding surface is: in the plane at any axial position, the ratio of the circumferential space on the inner diameter side to the circumferential space on the outer diameter side is 2:1, and the wind speed of the cooling wind passing over the surface of the pole winding on the outer diameter side can be increased to about twice that of the inner diameter side, thereby changing the convective heat transfer coefficient by increasing the relative wind speed, weakening the effect of the cooling air flowing to the outer diameter side of the pole winding, and causing the heat exchange capacity of the cooling air to be attenuated with the radial outer surface of the pole winding due to heat exchange and temperature rise, thereby reducing the difference in cooling effect between the inner and outer diameters of the pole winding.

[0027] 4. In the method adopted by the present invention, the first part of the cold air in the second cooling air enters the radial air duct on the inner surface, and then leaves from the circumferential ventilation groove on the outer support plate to cool the inner surface of the pole winding, thereby solving the technical problem of excessive temperature rise on the inner surface of the pole winding.

[0028] 5. In the method adopted by the present invention, the first cooling air flows axially to cool the magnetic pole coil, combined with the heat dissipation fin structure, and the L / H is controlled to be 2~3, which is beneficial to maximize the potential of axial ventilation cooling.

[0029] 6. In the method adopted by the present invention, the second part of the second cooling air cools the magnetic pole coil radially, which can make up for the problem of reduced cooling capacity in the middle of the magnetic pole coil caused by reduced air volume in the process of reaching the middle of the poles and pressure drop and temperature rise; and the heat dissipation fin and ventilation fin structure of the middle magnetic pole coil are adjusted to control Ls to L / 3~L / 2, so that the second part of the cooling air flowing radially can smoothly flow around and cool the space between the heat dissipation fins, thereby ensuring the effect of radial ventilation cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the cooling air path of the present invention.

[0031] Figure 2 yes Figure 1 AA section view.

[0032] Figure 3 yes Figure 1 BB cross-sectional view.

[0033] Figure 4 It is a schematic diagram of the axial air duct on the outer surface of the inter-pole of the present invention.

[0034] Figure 5 It is a schematic diagram of the inter-electrode space separation device.

[0035] Figure 6 yes Figure 5 CC cross-sectional view.

[0036] Figure 7 It is a schematic diagram of the cross section of the copper busbar with heat dissipation fins.

[0037] Figure 8 It is a cross-sectional schematic diagram of the alternating arrangement of copper bars with ventilation fins and copper bars with heat dissipation fins.

[0038] Fig. 9 It is a schematic cross-sectional view of a copper busbar with heat dissipation fins arranged at intervals on a multi-turn copper busbar.

[0039] In the attached drawings: 1-pole core; 2-pole winding; 3-outer support plate; 4-inter-pole space separator; 5-yoke; 6-radial air duct between yoke segments; 7-radial air duct on the inner surface; 8-leeward side; 9-windward side; 10-radial air duct on the outer surface between poles; 11-axial air duct on the outer surface between poles; 12-radial ventilation holes; 13-heat dissipation fins; 14-wind shield at the pole end; 15-ventilation fins. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0041] Example 1 A method for improving the cooling effect of the surface of a hydro-generator magnetic pole winding comprises the following specific steps: Step s1: Figure 1 As shown, cooling air is introduced from the yoke 5, and the cooling air is divided into a first cooling air path and a second cooling air path; wherein the first cooling air path passes through the pole pole end wind shields 14 provided at the upper top and lower bottom of the pole, and is guided into the axial air duct 11 on the outer surface between the poles; while the first cooling air path cools the upper top and lower bottom of the pole winding 2, the first cooling air path enters the axial air duct 11 on the outer surface between the poles, and cools the outer surface of the pole winding 2 in the end area; the second cooling air path enters directly from the radial air duct 6 between the yoke segments of the yoke 5, and cools the outer surface of the pole winding 2 in the middle area; Step s2: Figure 2 and Figure 4 As shown, after the first cooling wind enters the axial wind duct 11 on the outer surface of the interpole from the upper top and lower bottom of the magnetic pole, the wind speed of the first cooling wind gradually increases in the process of reaching the middle area from the two end areas of the magnetic pole, and the first cooling wind leaves in the direction from the inner diameter to the outer diameter of the magnetic pole; due to the inherent structure of the magnetic pole, the temperature of the middle area of ​​the magnetic pole is higher than the temperature of the two end areas, and the axial wind duct 11 on the outer surface of the interpole in the middle area can be narrowed to speed up the wind speed passing through the middle area, change the convection heat transfer coefficient, and thus reduce the temperature difference between the middle area and the two end areas; the axial wind duct 11 on the outer surface of the interpole refers to the gap along the axial direction of the magnetic pole formed between the interpole space separator 4 and the magnetic pole winding 2 adjacent to the interpole space separator 4; the interpole space separator 4 is a wide gap in the middle area of ​​the magnetic pole. The width of the partition is greater than that of the partition at the two end areas of the magnetic pole, and the width of the partition at the inner diameter of the magnetic pole is less than that at the outer diameter of the magnetic pole; in addition, another structure of the inter-pole space separation device is as follows: the inter-pole space separation device 4 includes an outer wind guiding structure, an inner wind guiding structure and a T-tail structure; the outer wind guiding structure is arranged between adjacent magnetic pole windings 2 along the magnetic pole radial direction; the inner wind guiding structure is arranged between the inner diameter side of adjacent magnetic pole windings 2 and the yoke 5 along the magnetic pole circumference; the T-tail structure is connected to the T-tail groove of the yoke 5; the outer wind guiding structure is arranged on the outer side of the inner wind guiding structure, and the outer wind guiding structure and the inner wind guiding structure are connected to each other; the T-tail structure is arranged on the inner side of the inner wind guiding structure, and the T-tail structure is connected to the inner wind guiding structure; a plurality of radial ventilation holes 12 are opened in the axial middle area of ​​the inner wind guiding structure; Step s3: Figure 3 and Figure 6 As shown, after the second cooling air enters from the radial air duct 6 between the yoke segments of the yoke 5, it is divided into a first portion of cooling air and a second portion of cooling air; wherein the first portion of cooling air passes through the inner side air guide structure of the inter-polar space separator 4, and is guided into the inner surface radial air duct 7, and then leaves from the circumferential ventilation slot on the outer support plate 3; Figure 6 As shown, the second part of the cooling wind passes through the radial ventilation holes 12 located in the middle area of ​​the pole and opened in the inter-pole space separation device 4, and leaves from the inner diameter of the pole to the outer diameter along the radial wind duct 10 on the outer surface of the inter-pole, and the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter; the first part of the cooling wind mainly cools the inner surface of the pole winding 2, and the second part of the cooling wind mainly cools the outer surface of the pole winding 2 in the middle area; the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter, and the radial wind duct 10 on the outer surface of the inter-pole can be gradually reduced to speed up the wind speed from the inner diameter to the outer diameter of the pole winding 2, change the convection heat transfer coefficient, and thus reduce the temperature difference from the inner diameter to the outer diameter of the pole winding 2; as shown Figure 3 and Figure 4 As shown, the radial air duct 10 on the outer surface between poles refers to the gap along the radial direction of the pole formed between the interpole space separator 4 and the pole winding 2 adjacent to the interpole space separator 4; the radial air duct 7 on the inner surface is the gap formed between the inner side of the pole winding 2 and the pole core 1.

[0042] The magnetic poles are as follows Figure 2 and Figure 3 As shown in the direction of rotation, one side of the outer surface of the adjacent pole windings 2 is the leeward side 8 , and the other side is the windward side 9 .

[0043] Example 2 Step s1: Figure 1 As shown, cooling air is introduced from the yoke 5, and the cooling air is divided into a first cooling air path and a second cooling air path; wherein the first cooling air path passes through the pole pole end wind shields 14 provided at the upper top and lower bottom of the pole, and is guided into the axial air duct 11 on the outer surface between the poles; while the first cooling air path cools the upper top and lower bottom of the pole winding 2, the first cooling air path enters the axial air duct 11 on the outer surface between the poles, and cools the outer surface of the pole winding 2 in the end area; the second cooling air path enters directly from the radial air duct 6 between the yoke segments of the yoke 5, and cools the outer surface of the pole winding 2 in the middle area; Step s2: Figure 2 and Figure 4As shown, after the first cooling wind enters the axial wind channel 11 on the outer surface of the interpole from the upper top and lower bottom of the magnetic pole, the wind speed of the first cooling wind gradually increases in the process of reaching the middle area from the two end areas of the magnetic pole, and the first cooling wind leaves from the direction of the inner diameter to the outer diameter of the magnetic pole; due to the inherent structure of the magnetic pole, the temperature of the middle area of ​​the magnetic pole is higher than the temperature of the two end areas, and the axial wind channel 11 on the outer surface of the interpole in the middle area can be shortened to speed up the wind speed passing through the middle area, change the convection heat transfer coefficient, and thus reduce the temperature difference between the middle area and the two end areas; the axial wind channel 11 on the outer surface of the interpole refers to the gap formed along the axial direction of the magnetic pole between the interpole space separator 4 and the magnetic pole winding 2 adjacent to the interpole space separator 4; Step s3: Figure 3 and Figure 6 As shown, after the second cooling air enters from the radial air duct 6 between the yoke segments of the yoke 5, it is divided into a first portion of cooling air and a second portion of cooling air; wherein the first portion of cooling air passes through the inner side air guide structure of the inter-polar space separator 4, and is guided into the inner surface radial air duct 7, and then leaves from the circumferential ventilation slot on the outer support plate 3; Figure 6 As shown, the second part of the cooling wind passes through the radial ventilation holes 12 located in the middle area of ​​the pole and opened in the inter-pole space separation device 4, and leaves from the inner diameter of the pole to the outer diameter along the radial wind duct 10 on the outer surface of the inter-pole, and the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter; the first part of the cooling wind mainly cools the inner surface of the pole winding 2, and the second part of the cooling wind mainly cools the outer surface of the pole winding 2 in the middle area; the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter, and the radial wind duct 10 on the outer surface of the inter-pole can be gradually reduced to speed up the wind speed from the inner diameter to the outer diameter of the pole winding 2, change the convection heat transfer coefficient, and thus reduce the temperature difference from the inner diameter to the outer diameter of the pole winding 2; as shown Figure 3 and Figure 4 As shown, the radial air duct 10 on the outer surface between poles refers to the gap along the radial direction of the pole formed between the interpole space separator 4 and the pole winding 2 adjacent to the interpole space separator 4; the radial air duct 7 on the inner surface is the gap formed between the inner side of the pole winding 2 and the pole core 1.

[0044] The magnetic poles are as follows Figure 2 and Figure 3 As shown in the direction of rotation, one side of the outer surface of the adjacent pole windings 2 is the leeward side 8 , and the other side is the windward side 9 .

[0045] like Figure 4As shown, the inter-pole space separator 4 is arranged on the ventilation and cooling air duct on the outer surface of the inter-pole winding along the axial direction of the pole; the ventilation and cooling air duct on the outer surface of the inter-pole winding is formed by the gap between the outer surfaces of adjacent pole windings 2; the two end regions are symmetrically arranged in the axial direction, and the axial length of each end region accounts for 1 / 4 to 1 / 3 of the total axial length of the pole winding 2; from the two end regions to the middle region, along the axial direction of the pole winding 2, the circumferential shape of the inter-pole space separator 4 in the end region of the pole gradually widens, so that the wind speed of the first cooling wind gradually increases in the process of reaching the middle region from the two end regions of the pole; the inter-pole outer surface axial The axial wind channel 11 also changes due to the change in the shape of the inter-pole space device. The axial wind channel 11 on the outer surface of the inter-pole shows that the circumferential space of the two end regions is larger than the circumferential space of the middle region. When the cooling wind enters the inter-pole outer surface wind channel, the cooling wind passing through the middle region will naturally increase the wind speed due to the narrowing of the middle region. Along the axial direction of the magnetic pole winding 2, the specific ratio of the space formed by the inter-pole space separator 4 and the surface of the adjacent magnetic pole winding 2 is: the ratio of the circumferential space of the two end regions to the circumferential space of the middle region is 1:0.8, and the size of the inter-pole space separator 4 changes continuously along the axial direction of the magnetic pole end region. Figure 4 As shown in the figure, S1 is the circumferential space size of the end, and S2 is the circumferential space size of the middle area, and the ratio of the two at the same radial position is 1:0.8; when the first cooling air reaches the middle area, the wind speed of the cooling air passing over the surface of the pole winding 2 is increased to about 1.25 times that of the end; from the inner diameter inner side of the pole winding 2 to the outer diameter outer side of the pole winding 2, the circumferential shape of the inter-pole space separator 4 is gradually widened, and the radial air duct 10 on the outer surface of the inter-pole presents that the inner diameter side space is larger than the outer diameter side space, so that the second part of the second cooling air is cooled from the inner diameter side. In the process of leaving from the inner diameter to the outer diameter, the wind speed gradually increases; when the second part of the second cooling air flows from the inner diameter side to the outer diameter side, the wind speed of the second part of the second cooling air gradually increases due to the gradual narrowing of the radial air duct 10 on the outer surface of the inter-pole. Along the radial direction of the pole winding 2, the specific ratio of the space formed by the inter-pole space separator 4 and the surface of the adjacent pole winding 2 is: in the plane at any axial position, the ratio of the circumferential space on the inner diameter side to the circumferential space on the outer diameter side is 2:1, and the size of the inter-pole space separator 4 changes continuously along the radial direction of the pole winding; Figure 2As shown in the figure, D1 is the circumferential space on the inner diameter side, and D2 is the circumferential space on the outer diameter side, and the ratio of the two is 2:1; the wind speed of the cooling wind passing over the surface of the pole winding 2 on the outer diameter side is increased to about twice that of the inner diameter side; the middle area is located in the middle of the ventilation cooling air duct on the outer surface of the pole winding inter-pole, and the axial length of the middle area accounts for 1 / 3~1 / 2 of the total axial length of the pole winding; the outer support plate 3 is installed between the outer diameter side of the pole winding 2 and the pole core 1, and the circumferential ventilation groove is opened on the outer support plate 3, the depth of the circumferential ventilation groove is 1 / 2 of the thickness of the outer support plate, the width is 20~30mm, and the interval between the circumferential ventilation groove and the circumferential ventilation groove edge is 20~30mm.

[0046] Example 3 Step s1: Figure 1 As shown, cooling air is introduced from the yoke 5, and the cooling air is divided into a first cooling air path and a second cooling air path; wherein the first cooling air path passes through the pole pole end wind shields 14 provided at the upper top and lower bottom of the pole, and is guided into the axial air duct 11 on the outer surface between the poles; while the first cooling air path cools the upper top and lower bottom of the pole winding 2, the first cooling air path enters the axial air duct 11 on the outer surface between the poles, and cools the outer surface of the pole winding 2 in the end area; the second cooling air path enters directly from the radial air duct 6 between the yoke segments of the yoke 5, and cools the outer surface of the pole winding 2 in the middle area; Step s2: Figure 2 and Figure 4 As shown, after the first cooling wind enters the axial wind channel 11 on the outer surface of the interpole from the upper top and lower bottom of the magnetic pole, the wind speed of the first cooling wind gradually increases in the process of reaching the middle area from the two end areas of the magnetic pole, and the first cooling wind leaves from the direction of the inner diameter to the outer diameter of the magnetic pole; due to the inherent structure of the magnetic pole, the temperature of the middle area of ​​the magnetic pole is higher than the temperature of the two end areas, and the axial wind channel 11 on the outer surface of the interpole in the middle area can be shortened to speed up the wind speed passing through the middle area, change the convection heat transfer coefficient, and thus reduce the temperature difference between the middle area and the two end areas; the axial wind channel 11 on the outer surface of the interpole refers to the gap formed along the axial direction of the magnetic pole between the interpole space separator 4 and the magnetic pole winding 2 adjacent to the interpole space separator 4; Step s3: Figure 3 and Figure 6 As shown, after the second cooling air enters from the radial air duct 6 between the yoke segments of the yoke 5, it is divided into a first portion of cooling air and a second portion of cooling air; wherein the first portion of cooling air passes through the inner side air guide structure of the inter-polar space separator 4, and is guided into the inner surface radial air duct 7, and then leaves from the circumferential ventilation slot on the outer support plate 3; Figure 6As shown, the second part of the cooling wind passes through the radial ventilation holes 12 located in the middle area of ​​the pole and opened in the inter-pole space separation device 4, and leaves from the inner diameter of the pole to the outer diameter along the radial wind duct 10 on the outer surface of the inter-pole, and the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter; the first part of the cooling wind mainly cools the inner surface of the pole winding 2, and the second part of the cooling wind mainly cools the outer surface of the pole winding 2 in the middle area; the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter, and the radial wind duct 10 on the outer surface of the inter-pole can be gradually reduced to speed up the wind speed from the inner diameter to the outer diameter of the pole winding 2, change the convection heat transfer coefficient, and thus reduce the temperature difference from the inner diameter to the outer diameter of the pole winding 2; as shown Figure 3 and Figure 4 As shown, the radial air duct 10 on the outer surface between poles refers to the gap along the radial direction of the pole formed between the interpole space separator 4 and the pole winding 2 adjacent to the interpole space separator 4; the radial air duct 7 on the inner surface is the gap formed between the inner side of the pole winding 2 and the pole core 1.

[0047] The magnetic poles are as follows Figure 2 and Figure 3 As shown in the direction of rotation, one side of the outer surface of the adjacent pole windings 2 is the leeward side 8 , and the other side is the windward side 9 .

[0048] like Figure 5As shown, the inter-pole space separation device 4 includes an outer wind guiding structure, an inner wind guiding structure and a T-tail structure; the outer wind guiding structure is arranged between adjacent pole windings 2 along the pole radial direction; the inner wind guiding structure is arranged between the inner diameter side of adjacent pole windings 2 and the yoke 5 along the pole circumferential direction; the T-tail structure is connected to the T-tail groove of the yoke 5; the outer wind guiding structure is arranged on the outer side of the inner wind guiding structure, where the outer side refers to the outer side along the direction from the inner diameter to the outer diameter of the pole, and the outer wind guiding structure and the inner wind guiding structure are connected to each other; the T-tail structure is arranged on the inner side of the inner wind guiding structure, where the inner side refers to the inner side along the direction from the outer diameter to the inner diameter of the pole, and the T-tail structure is connected to the inner wind guiding structure; the axial direction of the inner wind guiding structure A plurality of radial ventilation holes 12 are provided in the middle region, and the plurality of radial ventilation holes 12 are specifically provided at the connection between the outer air guiding structure and the inner air guiding structure, and are connected with the radial air duct 10 on the outer surface between the poles, so that the second part of the cooling air leaves the radial ventilation holes 12 and directly reaches the outer side of the magnetic pole along the radial air duct 10 on the outer surface between the poles, thereby cooling the outer surface of the adjacent magnetic pole winding 2 in the middle region; the outer surface and the inner surface of the inner air guiding structure are respectively fitted with the inner side surface of the inner diameter of the magnetic pole winding 2 and the yoke 5; air guiding slopes are arranged on both sides of the inner air guiding structure, and the air guiding slopes, the yoke 5 and the magnetic pole core 1 form an air guiding channel, and the circumferential space of the air guiding channel gradually becomes smaller along the flow direction of the cooling air. The radial ventilation holes 12 in the middle area of ​​the poles of the inter-pole space separator 4 are aligned with the radial air ducts 6 between the yoke segments in the axial direction of the poles; the T-tail structure at the inner diameter side plane of the inter-pole space separator 4 is connected to the T-tail slot of the yoke 5 through a gasket or a wedge key; the inter-pole space separator 4 is made of aluminum alloy; the outer diameter side surface of the inter-pole space separator 4 is flush with the outer diameter side surface of the pole winding 2 on the same circumferential surface.

[0049] like Figure 7 As shown, the magnetic pole winding 2 adopts a winding structure with heat dissipation fins 13, which is specifically formed by welding and die-pressing a plurality of turns of copper bars with heat dissipation fins 13, the thickness of the copper bars K = 4-8 mm, and the ratio of the length L of the heat dissipation fins 13 to the spacing H between adjacent heat dissipation fins 13 is: L / H = 2-3; the magnetic pole winding 2 is provided with copper bars with heat dissipation fins 13 at intervals on the plurality of turns of copper bars in the axial middle area; Figure 8 As shown, the magnetic pole winding 2 further includes a copper bar with ventilation fins 15 in the axial middle area, and the copper bar with ventilation fins 15 and the copper bar with heat dissipation fins 13 are alternately arranged along the radial direction of the magnetic pole winding 2; the length of the ventilation fins 15 is L / 3~L / 2; the copper bar with ventilation fins 15 is processed by processing the original copper bar with heat dissipation fins 13, and the heat dissipation fins 13 are shortened to obtain the ventilation fins 15, and the heat dissipation fins 13 can also be completely removed to obtain the following Fig. 9As shown, the copper bar with neither the heat dissipation fins 13 nor the ventilation fins 15 is arranged alternately with the copper bar with the heat dissipation fins 13 along the radial direction of the pole winding 2; the purpose of arranging the copper bar in the axial middle area is to enable the inter-pole space separator 4 whose width varies in the axial direction and radial direction to form a ventilation space with the outer surface of the pole winding 2 in the middle area.

[0050] Example 4 Step s1: Figure 1 As shown, cooling air is introduced from the yoke 5, and the cooling air is divided into a first cooling air path and a second cooling air path; wherein the first cooling air path passes through the pole pole end wind shields 14 provided at the upper top and lower bottom of the pole, and is guided into the axial air duct 11 on the outer surface between the poles; while the first cooling air path cools the upper top and lower bottom of the pole winding 2, the first cooling air path enters the axial air duct 11 on the outer surface between the poles, and cools the outer surface of the pole winding 2 in the end area; the second cooling air path enters directly from the radial air duct 6 between the yoke segments of the yoke 5, and cools the outer surface of the pole winding 2 in the middle area; Step s2: Figure 2 and Figure 4 As shown, after the first cooling wind enters the axial wind channel 11 on the outer surface of the interpole from the upper top and lower bottom of the magnetic pole, the wind speed of the first cooling wind gradually increases in the process of reaching the middle area from the two end areas of the magnetic pole, and the first cooling wind leaves from the direction of the inner diameter to the outer diameter of the magnetic pole; due to the inherent structure of the magnetic pole, the temperature of the middle area of ​​the magnetic pole is higher than the temperature of the two end areas, and the axial wind channel 11 on the outer surface of the interpole in the middle area can be shortened to speed up the wind speed passing through the middle area, change the convection heat transfer coefficient, and thus reduce the temperature difference between the middle area and the two end areas; the axial wind channel 11 on the outer surface of the interpole refers to the gap formed along the axial direction of the magnetic pole between the interpole space separator 4 and the magnetic pole winding 2 adjacent to the interpole space separator 4; Step s3: Figure 3 and Figure 6 As shown, after the second cooling air enters from the radial air duct 6 between the yoke segments of the yoke 5, it is divided into a first portion of cooling air and a second portion of cooling air; wherein the first portion of cooling air passes through the inner side air guide structure of the inter-polar space separator 4, and is guided into the inner surface radial air duct 7, and then leaves from the circumferential ventilation slot on the outer support plate 3; Figure 6As shown, the second part of the cooling wind passes through the radial ventilation holes 12 located in the middle area of ​​the pole and opened in the inter-pole space separation device 4, and leaves from the inner diameter of the pole to the outer diameter along the radial wind duct 10 on the outer surface of the inter-pole, and the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter; the first part of the cooling wind mainly cools the inner surface of the pole winding 2, and the second part of the cooling wind mainly cools the outer surface of the pole winding 2 in the middle area; the wind speed gradually increases during the process of the second part of the cooling wind leaving from the inner diameter to the outer diameter, and the radial wind duct 10 on the outer surface of the inter-pole can be gradually reduced to speed up the wind speed from the inner diameter to the outer diameter of the pole winding 2, change the convection heat transfer coefficient, and thus reduce the temperature difference from the inner diameter to the outer diameter of the pole winding 2; as shown Figure 3 and Figure 4 As shown, the radial air duct 10 on the outer surface between poles refers to the gap along the radial direction of the pole formed between the interpole space separator 4 and the pole winding 2 adjacent to the interpole space separator 4; the radial air duct 7 on the inner surface is the gap formed between the inner side of the pole winding 2 and the pole core 1.

[0051] The magnetic poles are as follows Figure 2 and Figure 3 As shown in the direction of rotation, one side of the outer surface of the adjacent pole windings 2 is the leeward side 8 , and the other side is the windward side 9 .

[0052] like Figure 4 As shown, the inter-pole space separator 4 is arranged on the ventilation and cooling air duct on the outer surface of the inter-pole winding along the axial direction of the pole; the ventilation and cooling air duct on the outer surface of the inter-pole winding is formed by the gap between the outer surfaces of adjacent pole windings 2; the two end regions are symmetrically arranged in the axial direction, and the axial length of each end region accounts for 1 / 4 to 1 / 3 of the total axial length of the pole winding 2; from the two end regions to the middle region, along the axial direction of the pole winding 2, the circumferential shape of the inter-pole space separator 4 in the pole end region is gradually widened, so that the wind speed of the first cooling wind gradually increases in the process of reaching the middle region from the two end regions of the pole; the inter-pole outer surface axial duct 11 Due to the change in the shape of the inter-pole space device, the change also occurs. The axial air duct 11 on the inter-pole outer surface presents that the circumferential space of the two end regions is larger than the circumferential space of the middle region. When the cooling air enters the inter-pole outer surface air duct, the cooling air passing through the middle region will naturally increase the wind speed due to the narrowing of the middle region. Along the axial direction of the magnetic pole winding 2, the specific ratio of the space formed by the inter-pole space separator 4 and the surface of the adjacent magnetic pole winding 2 is: at the same radial position, the ratio of the circumferential space of the two end regions to the circumferential space of the middle region is 1:0.8, and the size of the inter-pole space separator 4 changes continuously along the axial direction of the magnetic pole end region. Figure 4As shown in the figure, S1 is the circumferential space size of the end, S2 is the circumferential space size of the middle area, and the ratio of the two is 1:0.8; when the first cooling air reaches the middle area, the wind speed of the cooling air passing over the surface of the pole winding 2 is increased to about 1.25 times that of the end; from the inner diameter inner side of the pole winding 2 to the outer diameter outer side of the pole winding 2, the circumferential shape of the inter-pole space separator 4 is gradually widened, and the radial air duct 10 on the outer surface of the inter-pole presents that the inner diameter side space is larger than the outer diameter side space, so that the second part of the second cooling air is separated from the inner diameter to the outer diameter. During the opening process, the wind speed gradually increases; when the second part of the second cooling air flows from the inner diameter side to the outer diameter side, the wind speed of the second part of the second cooling air gradually increases due to the gradual narrowing of the radial air duct 10 on the outer surface of the inter-pole. Along the radial direction of the pole winding 2, the specific ratio of the space formed by the inter-pole space separator 4 and the surface of the adjacent pole winding 2 is: in the plane at any axial position, the ratio of the circumferential space on the inner diameter side to the circumferential space on the outer diameter side is 2:1, and the size of the inter-pole space separator 4 changes continuously along the radial direction of the pole winding; Figure 2 As shown in the figure, D1 is the circumferential space on the inner diameter side, and D2 is the circumferential space on the outer diameter side, and the ratio of the two is 2:1; the wind speed of the cooling wind passing over the surface of the pole winding 2 on the outer diameter side is increased to about twice that of the inner diameter side; the middle area is located in the middle of the ventilation cooling air duct on the outer surface of the pole winding inter-pole, and the axial length of the middle area accounts for 1 / 3~1 / 2 of the total axial length of the pole winding; the outer support plate 3 is installed between the outer diameter side of the pole winding 2 and the pole core 1, and the circumferential ventilation groove is opened on the outer support plate 3, the depth of the circumferential ventilation groove is 1 / 2 of the thickness of the outer support plate, the width is 20~30mm, and the interval between the circumferential ventilation groove and the circumferential ventilation groove edge is 20~30mm.

[0053] like Figure 5As shown, the inter-pole space separation device 4 includes an outer wind guiding structure, an inner wind guiding structure and a T-tail structure; the outer wind guiding structure is arranged between adjacent pole windings 2 along the pole radial direction; the inner wind guiding structure is arranged between the inner diameter side of adjacent pole windings 2 and the yoke 5 along the pole circumferential direction; the T-tail structure is connected to the T-tail groove of the yoke 5; the outer wind guiding structure is arranged on the outer side of the inner wind guiding structure, where the outer side refers to the outer side along the direction from the inner diameter to the outer diameter of the pole, and the outer wind guiding structure and the inner wind guiding structure are connected to each other; the T-tail structure is arranged on the inner side of the inner wind guiding structure, where the inner side refers to the inner side along the direction from the outer diameter to the inner diameter of the pole, and the T-tail structure is connected to the inner wind guiding structure; the axial direction of the inner wind guiding structure A plurality of radial ventilation holes 12 are provided in the middle region, and the plurality of radial ventilation holes 12 are specifically provided at the connection between the outer air guiding structure and the inner air guiding structure, and are connected with the radial air duct 10 on the outer surface between the poles, so that the second part of the cooling air leaves the radial ventilation holes 12 and directly reaches the outer side of the magnetic pole along the radial air duct 10 on the outer surface between the poles, thereby cooling the outer surface of the adjacent magnetic pole winding 2 in the middle region; the outer surface and the inner surface of the inner air guiding structure are respectively fitted with the inner side surface of the inner diameter of the magnetic pole winding 2 and the yoke 5; air guiding slopes are arranged on both sides of the inner air guiding structure, and the air guiding slopes, the yoke 5 and the magnetic pole core 1 form an air guiding channel, and the circumferential space of the air guiding channel gradually becomes smaller along the flow direction of the cooling air. The radial ventilation holes 12 in the middle area of ​​the poles of the inter-pole space separator 4 are aligned with the radial air ducts 6 between the yoke segments in the axial direction of the poles; the T-tail structure at the inner diameter side plane of the inter-pole space separator 4 is connected to the T-tail slot of the yoke 5 through a gasket or a wedge key; the inter-pole space separator 4 is made of aluminum alloy; the outer diameter side surface of the inter-pole space separator 4 is flush with the outer diameter side surface of the pole winding 2 on the same circumferential surface.

[0054] like Figure 7 As shown, the magnetic pole winding 2 adopts a winding structure with heat dissipation fins 13, which is specifically formed by welding and die-pressing a plurality of turns of copper bars with heat dissipation fins 13, the thickness of the copper bars K = 4-8 mm, and the ratio of the length L of the heat dissipation fins 13 to the spacing H between adjacent heat dissipation fins 13 is: L / H = 2-3; the magnetic pole winding 2 is provided with copper bars with heat dissipation fins 13 at intervals on the plurality of turns of copper bars in the axial middle area; Figure 8 As shown, the magnetic pole winding 2 further includes a copper bar with ventilation fins 15 in the axial middle area, and the copper bar with ventilation fins 15 and the copper bar with heat dissipation fins 13 are alternately arranged along the radial direction of the magnetic pole winding 2; the length of the ventilation fins 15 is L / 3~L / 2; the copper bar with ventilation fins 15 is processed by processing the original copper bar with heat dissipation fins 13, and the heat dissipation fins 13 are shortened to obtain the ventilation fins 15, and the heat dissipation fins 13 can also be completely removed to obtain the following Fig. 9As shown, the copper bar with neither the heat dissipation fins 13 nor the ventilation fins 15 is arranged alternately with the copper bar with the heat dissipation fins 13 along the radial direction of the pole winding 2; the purpose of arranging the copper bar in the axial middle area is to enable the inter-pole space separator 4 whose width varies in the axial direction and radial direction to form a ventilation space with the outer surface of the pole winding 2 in the middle area.

[0055] The above description is a detailed description of the preferred feasible embodiment of the present application, but the embodiment is not intended to limit the patent application scope of the present application. All equivalent changes or modified changes made under the technical spirit suggested by the present application should fall within the patent scope covered by the present application.

Claims

1. A method for improving the cooling effect of the surface of a hydro-generator pole winding, characterized in that: The specific steps include: Step s1: cooling air is introduced from the magnetic yoke (5), and the cooling air is divided into a first cooling air path and a second cooling air path; the first cooling air path passes through magnetic pole end wind shields (14) provided at the upper top and lower bottom of the magnetic pole, and is guided into the axial air duct (11) on the outer surface of the inter-pole space; the second cooling air path directly enters from the radial air duct (6) between the magnetic yoke segments of the magnetic yoke (5); Step s2: After the first cooling air enters the inter-pole outer surface axial air duct (11) from the upper top and lower bottom of the magnetic pole, the wind speed of the first cooling air increases in the process of reaching the middle area from the two end areas of the magnetic pole, and the first cooling air leaves in the direction from the inner diameter to the outer diameter of the magnetic pole; the inter-pole outer surface axial air duct (11) refers to the gap formed along the axial direction of the magnetic pole between the inter-pole space separator (4) and the magnetic pole winding (2) adjacent to the inter-pole space separator (4); Step s3: After the second cooling air enters the radial air duct (6) between the yoke segments of the yoke (5), it is divided into a first portion of cooling air and a second portion of cooling air; wherein the first portion of cooling air passes through the inner side wind guide structure of the inter-pole space separator (4), guides the first portion of cooling air into the inner surface radial air duct (7), and then leaves from the circumferential ventilation slot on the outer support plate (3); wherein the second portion of cooling air passes through the radial ventilation holes (12) located in the middle region of the magnetic pole and opened in the inter-pole space separator (4), and leaves from the inner diameter to the outer diameter of the magnetic pole along the inter-pole outer surface radial air duct (10), and the wind speed of the second portion of cooling air increases during the process of leaving from the inner diameter to the outer diameter; the inter-pole outer surface radial air duct (10) refers to the gap formed along the radial direction of the magnetic pole between the inter-pole space separator (4) and the magnetic pole winding (2) adjacent to the inter-pole space separator (4); the inner surface radial air duct (7) is the gap formed between the inner side of the magnetic pole winding (2) and the magnetic pole core (1).

2. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 1, characterized in that: The inter-pole space separation device (4) is arranged on the inter-pole outer surface ventilation and cooling air duct of the pole winding along the axial direction of the magnetic pole; the inter-pole outer surface ventilation and cooling air duct of the pole winding is formed by the gap between the outer surfaces of adjacent pole windings (2).

3. A method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 2, characterized in that: The two end regions are symmetrically arranged in the axial direction, and the axial length of each end region accounts for 1 / 4 to 1 / 3 of the total axial length of the magnetic pole winding (2); from the two end regions to the middle region, the circumferential shape of the inter-pole space separation device (4) in the axial direction of the magnetic pole winding (2) is widened in the magnetic pole end region, so that the wind speed of the first cooling wind increases in the process of reaching the middle region from the two end regions of the magnetic pole.

4. A method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 2, characterized in that: The circumferential shape of the inter-pole space separator (4) widens from the inner diameter inner side surface of the pole winding (2) to the outer diameter outer side surface of the pole winding (2), so that the wind speed of the second part of the second cooling air increases in the process of leaving from the inner diameter to the outer diameter.

5. A method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 3, characterized in that: Along the axial direction of the magnetic pole winding (2), the specific ratio of the space formed by the inter-pole space separation device (4) and the surface of the adjacent magnetic pole winding (2) is: the ratio of the circumferential space in the two end regions to the circumferential space in the middle region is 1:0.

8.

6. A method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 4, characterized in that: Along the radial direction of the magnetic pole winding (2), the specific ratio of the space formed by the inter-pole space dividing device (4) and the surface of the adjacent magnetic pole winding (2) is: the ratio of the circumferential space on the inner diameter side to the circumferential space on the outer diameter side is 2:

1.

7. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 2, characterized in that: The inter-pole space separation device (4) comprises an outer wind guiding structure, an inner wind guiding structure and a T-tail structure; the outer wind guiding structure is arranged between adjacent pole windings (2) along the pole radial direction; the inner wind guiding structure is arranged between the inner diameter side of adjacent pole windings (2) and the yoke (5) along the pole circumferential direction; the T-tail structure is connected to the T-tail slot of the yoke (5); the outer wind guiding structure is arranged on the outer side of the inner wind guiding structure, and the outer wind guiding structure and the inner wind guiding structure are connected to each other; the T-tail structure is arranged on the inner side of the inner wind guiding structure, and the T-tail structure is connected to the inner wind guiding structure; and a plurality of radial ventilation holes (12) are provided in the axial middle area of ​​the inner wind guiding structure.

8. A method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 7, characterized in that: The outer surface and the inner surface of the inner air guide structure are respectively fitted to the inner diameter side surface of the magnetic pole winding (2) and the magnetic yoke (5).

9. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 7, characterized in that: Wind guiding slopes are arranged on both sides of the inner wind guiding structure, and the wind guiding slopes, the magnetic yoke (5) and the magnetic pole core (1) form a wind guiding channel.

10. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 7, characterized in that: The radial ventilation holes (12) of the inter-pole space separation device (4) in the middle region of the magnetic pole are aligned with the radial air ducts (6) between the magnetic yoke segments in the axial direction of the magnetic pole.

11. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 7, characterized in that: The T-tail structure at the inner diameter side plane of the inter-polar space dividing device (4) is connected to the T-tail groove of the magnetic yoke (5) via a gasket or a wedge key.

12. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 7, characterized in that: The inter-electrode space separator (4) is made of aluminum alloy.

13. The method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 2, characterized in that: The outer diameter side surface of the inter-pole space dividing device (4) and the outer diameter side surface of the magnetic pole winding (2) are flush on the same circumferential surface.

14. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 4, characterized in that: The magnetic pole winding (2) adopts a winding structure with heat dissipation fins (13), which is formed by welding and molding a plurality of turns of copper bars with heat dissipation fins (13), the copper bar thickness K=4-8 mm, and the ratio of the heat dissipation fin (13) length L to the spacing H between adjacent heat dissipation fins (13) is: L / H=2-3.

15. A method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 14, characterized in that: Copper bars with heat dissipation fins (13) are arranged at intervals on the multiple turns of copper bars in the axial middle region of the magnetic pole winding (2).

16. A method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 15, characterized in that: The magnetic pole winding (2) further comprises a copper bar with ventilation fins (15) in the axial middle region, and the copper bar with ventilation fins (15) and the copper bar with heat dissipation fins (13) are arranged alternately along the radial direction of the magnetic pole winding (2); the length Ls of the ventilation fins (15) is L / 3~L / 2.

17. A method for improving the cooling effect of the surface of a hydro-generator pole winding according to claim 10, characterized in that: The middle region is located in the middle of the ventilation and cooling air duct on the outer surface of the pole winding inter-pole, and the axial length of the middle region accounts for 1 / 3 to 1 / 2 of the total axial length of the pole winding (2).

18. The method for improving the cooling effect of the surface of the magnetic pole winding of a hydro-generator according to claim 1, characterized in that: The outer support plate (3) is installed between the outer diameter side of the magnetic pole winding (2) and the magnetic pole core (1), and a circumferential ventilation groove is provided on the outer support plate (3); the depth of the circumferential ventilation groove is 1 / 2 of the thickness of the outer support plate, the width is 20-30 mm, and the spacing between the circumferential ventilation groove and the circumferential ventilation groove edge is 20-30 mm.

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