A hybrid ventilation cooling method for improving the temperature difference of magnetic pole coils

Abstract

The present invention relates to the technical field of cooling of high-speed, large-capacity hydro-turbine generators and pumped-storage power generation motors, and specifically to a mixed ventilation cooling method for improving the temperature difference of a pole coil; the method passes cooling air through a yoke, and the cooling air is divided into three routes; the first route of cooling air reaches a ventilation box between poles, enters a radial air duct of the pole coil, passes through a circumferential air duct of the pole coil, and reaches an inter-pole radial air duct; the second route of cooling air is divided into two parts of cooling air, the first part of cooling air directly enters the inter-pole radial air duct, and the second part of cooling air enters the radial air duct of the pole coil, passes through the circumferential air duct of the pole coil, and reaches the inter-pole radial air duct; the third route of cooling air is divided into a third part of cooling air and a fourth part of cooling air, the third part of cooling air enters the radial air duct at the pole end, and the fourth part of cooling air enters the inter-pole axial air duct; the present invention realizes all-round cooling of the pole coil, improves the overall temperature difference level of the pole coil, and enhances the temperature rise uniformity of the pole coil.

Description

Technical Field

[0001] The invention relates to the technical field of cooling of high-speed, large-capacity hydroelectric generators and pumped-storage power generation motors, and in particular to a mixed ventilation cooling method for improving the temperature difference of magnetic pole coils. Background Art

[0002] The operating conditions of pumped-storage power generation motors are complex and have the characteristics of bidirectional rotation. Not only are there problems with inconsistent cooling conditions on the leeward and windward sides of the pole coils of conventional hydro-turbine generators, but there is also the problem of repeated switching of the leeward and windward sides of the pole coils as the direction of rotation changes. The temperature difference problem of the pole coils is even more complicated. Moreover, for high-speed, large-capacity generators and pumped-storage power generation motors in major hydropower projects, the rotors are often more slender, generating more heat, and the problem of large temperature differences in the pole coils is more prominent.

[0003] The existing technical solutions include a cooling structure that simply adopts external surface ventilation, a structure that adopts combined cooling of the internal and external surfaces, and a solution that uses internal air ducts in the pole coil to enhance the cooling effect of the pole coil. These solutions often only consider the control of the overall temperature rise level of the pole coil, but do not fully consider the problem of all-round cooling of the pole coil, nor do they mention solutions to reduce the overall temperature difference of the pole coil.

[0004] For example, a Chinese patent application number is 201410024279.7, the application date is January 20, 2014, and the patent name is "A method for internal cooling and external cooling of rotor poles". The technical solution is as follows: the cooling gas flows into the channel between the two pole coils through the ventilation partition device on the air inlet end of the two pole coils to form an external cooling ventilation air path, and cools the outside of the pole coil. At the same time, the cooling gas flows into the interior of the pole coil through the gap between the pole core and the pole coil to form an internal cooling ventilation air path, and cools the inside of the pole coil, and then flows from the inside of the pole coil to the channel between the two pole coils. The ventilation partition device separates the external cooling ventilation air path and the internal cooling ventilation air path flowing into the channel.

[0005] The above patent separates the internal cooling and external cooling ventilation paths in the channel between the two pole coils, and the internal cooling and external cooling ventilation paths do not interfere with each other, so that the cooling gas of the internal ventilation flows smoothly into the channel between the two pole coils, thereby improving the cooling effect of the entire rotor pole; however, the ventilation zoning method of the above patent is too simple, and it is easy to cause the air path to mix, resulting in poor cooling effect on various parts of the pole, so the method of the above patent cannot achieve a good technical effect of uniformly cooling the entire rotor pole. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a mixed ventilation method, which partitions different cooling parts of the pole coil and uses different cooling air paths to cool the pole coil, thereby improving the overall temperature difference of the pole coil and improving the uniformity of the temperature rise of the pole coil. A mixed ventilation cooling method for improving the temperature difference of the pole coil is provided.

[0007] In order to achieve the above technical effects, the technical solution of the present invention is as follows:

[0008] A mixed ventilation cooling method for improving the temperature difference of a magnetic pole coil comprises the following specific steps:

[0009] Step 1: Cooling air is introduced from the yoke, and the cooling air is divided into the first cooling air, the second cooling air and the third cooling air on the entire magnetic pole; the first cooling air enters from the radial air duct between the yoke sections at the head and tail of the yoke, and the axial heights of the head and tail of the yoke along the magnetic pole correspond to the axial heights of the head and tail of the magnetic pole respectively; the second cooling air enters from the radial air duct between the yoke sections in the middle of the yoke, and the axial height of the middle of the yoke along the magnetic pole corresponds to the axial height of the middle of the magnetic pole along the magnetic pole; the third cooling air enters from the radial air ducts of the yoke fans at the upper end and the lower end of the yoke;

[0010] Step 2: After the first cooling air enters from the radial air duct between the yoke segments, it first reaches the inter-pole ventilation box, then enters the radial air duct of the pole coil, passes through the circumferential air duct of the pole coil, and finally reaches the inter-pole axial air duct;

[0011] Step 3: After the second cooling air enters from the radial air duct between the yoke segments, the second cooling air is divided into a first portion of cooling air and a second portion of cooling air. The first portion of cooling air directly enters the radial air duct between the magnetic poles, and the second portion of cooling air enters the radial air duct of the magnetic pole coil, passes through the circumferential air duct of the magnetic pole coil, and finally reaches the radial air duct between the magnetic poles.

[0012] Step 4: After the third cooling air enters from the radial air duct of the yoke fan, pole tip wind shields are respectively arranged above the upper end of the pole and below the lower end of the pole. The cross section of the pole tip wind shields has a curved wind guide surface, so that the third cooling air is divided into a third part of cooling air and a fourth part of cooling air. The third part of cooling air enters the radial air duct at the pole tip to cool the outer side surfaces of the upper and lower ends of the pole coil. The fourth part of cooling air enters the axial air duct between the poles to cool the axial outer surfaces of the pole coil at the head and tail of the pole.

[0013] Furthermore, the yoke includes a plurality of yoke segments, and the radial air ducts between the yoke segments are a plurality of gaps formed between the plurality of yoke segments.

[0014] Furthermore, the magnetic pole coil radial air duct is a gap formed between the inner side surface of the magnetic pole coil and the magnetic pole core.

[0015] Furthermore, the circumferential wind duct of the magnetic pole coil is a plurality of channels opened on the magnetic pole coil, and the plurality of channels are connected with the radial wind duct of the magnetic pole coil and the inter-pole radial wind duct formed between the outer surfaces of adjacent magnetic pole coils.

[0016] Furthermore, the total number of radial air ducts between the yoke segments on the yoke is the sum of the number of radial air ducts between the yoke segments at the head of the yoke, the tail of the yoke and the middle of the yoke.

[0017] Furthermore, the total number of radial air ducts between the yoke segments on the yoke ranges from 5 to 12.

[0018] Furthermore, there are two inter-pole ventilation boxes in step 2, each of which is composed of a wind shield, adjacent pole coils and a yoke; the adjacent pole coils are located on the outer diameter side of the yoke; the wind shield is installed between adjacent pole coils, and the wind shield is connected to the yoke at both ends along the axial direction of the pole.

[0019] Furthermore, the windshield includes two radial cover plates and an axial vertical plate; the axial vertical plate is installed between adjacent magnetic pole coils, and the two ends of the axial vertical plate along the axial direction of the magnetic pole are respectively connected to a radial cover plate; the two radial cover plates are both connected to the yoke.

[0020] Furthermore, the height of the wind shield along the axial direction of the pole is 1 / 4~1 / 3 of the height of the pole, and the height of the inter-pole ventilation box formed by the wind shield, adjacent pole coils and magnetic yoke is 1 / 4~1 / 3 of the height of the pole; the height of the pole head along the axial direction of the pole is equal to the height of the pole tail along the axial direction of the pole, and the height of the pole head and the pole tail along the axial direction of the pole are both 1 / 4~1 / 3 of the pole height; the height of the middle part of the pole along the axial direction of the pole is 1 / 3~1 / 2 of the pole height.

[0021] Furthermore, the inter-pole radial air duct in step three is a channel located in the middle of the magnetic pole and formed along the radial direction of the magnetic pole coil between the outer surfaces of adjacent magnetic pole coils.

[0022] Furthermore, the third cooling air is provided by yoke fans arranged at the upper end and the lower end of the yoke, and the radial air duct of the yoke fan is arranged inside the yoke fan.

[0023] Furthermore, the yoke fan height range is 100mm~200mm.

[0024] Furthermore, the inter-pole axial air duct is a channel formed along the axial direction of the pole coil between the outer surfaces of adjacent pole coils at the head and tail of the pole.

[0025] Furthermore, the radial wind channel at the pole end of the magnetic pole in step 4 is a channel formed between the wind shield at the pole end of the magnetic pole and the upper end of the magnetic pole, and a channel formed between the wind shield at the pole end of the magnetic pole and the lower end of the magnetic pole.

[0026] Furthermore, the third cooling wind is guided into the axial wind channel between the magnetic poles through the magnetic pole end wind shields arranged at the upper and lower ends of the magnetic poles.

[0027] Furthermore, the air volume distribution ratio of the first cooling air, the second cooling air and the third cooling air is 2:3:5, and the specific setting method of the structure to realize the air volume distribution is: the axial height of the radial air duct between the yoke segments is set to 60mm, and the total number of the radial air ducts between the yoke segments is 7, 2 radial air ducts between the yoke segments are respectively set at the head and the tail of the yoke, and 3 radial air ducts between the yoke segments are set in the middle of the yoke; the height of the ventilation box between the poles of a single magnetic pole is 1 / 3 of the total axial height of the magnetic pole, and the height of the radial air duct between the poles is 1 / 3 of the total axial height of the magnetic pole. An interpole ventilation box is respectively arranged at the pole head and the pole tail, and corresponds to the radial air ducts between the yoke sections at the yoke head and the yoke tail; the axial height of the radial air duct of the yoke fan is set to 150mm, and a radial air duct of the yoke fan is respectively arranged at the upper end and the lower end of the yoke; the circumferential width of the radial air duct of the pole coil is set to 8mm, and the circumferential air duct of the pole coil is evenly arranged along the axial direction and radial direction of the pole coil, and its ventilation surface area is 20% of the heat dissipation area of ​​the outer surface of the pole coil.

[0028] According to the above technical solution, the beneficial effects of the present invention are as follows:

[0029] 1. The method adopted by the present invention divides the cooling air into three paths, and performs mixed ventilation of multiple cooling methods in different regions on the head, tail, middle and upper and lower ends of the magnetic pole, so as to achieve different cooling parts of the magnetic pole coil and adopt different cooling air paths in different regions, avoid obvious interference between the air paths, better exert the cooling effect, and help to effectively improve the overall temperature difference level of the magnetic pole coil and improve the temperature rise uniformity of the magnetic pole coil; when axial ventilation is adopted, the cooling effect on the outer surface of the inter-pole of the magnetic pole coil with a heat dissipation turn structure is better than the cooling effect when radial ventilation is adopted; when radial ventilation is adopted, the cooling effect on the inner surface of the magnetic pole coil and the circumferential air duct of the magnetic pole coil is better than the cooling effect when axial ventilation is adopted; but if the three-way cooling air paths formed by the three different cooling methods of axial ventilation and radial ventilation produce obvious interference, it will seriously affect the ventilation effect, which is not conducive to controlling the temperature rise and its uniformity; therefore, the interference of the three-way cooling air paths can be avoided by zoning, and the cooling effect of different cooling methods in each region can be better exerted.

[0030] 2. The method adopted in the present invention adjusts the radial air ducts between the yoke segments, the radial air ducts of the yoke fan, the inter-pole ventilation box and the radial air ducts of the pole coil, so that different proportions of air volumes can be introduced into the head, tail, middle, upper and lower ends of the yoke, thereby realizing flexible adjustment of the cooling air volume, thereby effectively and stably improving the overall temperature difference level of the pole coil.

[0031] 3. In the method adopted by the present invention, a third cooling air is introduced from the upper end and the lower end of the yoke into the axial air duct between the poles, thereby cooling the outer surface of the pole coil at the head and tail of the pole.

[0032] 4. In the method adopted by the present invention, the second cooling air is introduced from the radial air duct between the yoke segments in the middle of the yoke, and then the second cooling air is directly directed to the radial air duct between the magnetic poles, thereby cooling the outer surface of the magnetic pole coil in the middle of the magnetic pole.

[0033] 5. In the method adopted by the present invention, the first cooling air is introduced from the radial air ducts between the yoke segments at the head and tail of the yoke, and the inside of the pole coil is cooled through the radial air ducts on the inner side of the pole coil and the circumferential air ducts of the pole coil.

[0034] 6. In the method of the present invention, the wind shield plate adopts a radial cover plate and an axial vertical plate, and is combined with a magnetic yoke and a magnetic pole coil to form a ventilation box that only retains the radial air duct outlet entering the magnetic pole coil, so that when the first cooling air enters, it is completely separated from other air paths, avoiding interference between air paths, making the cooling effect of each partition better, effectively improving the overall temperature difference level of the magnetic pole coil, and improving the temperature rise uniformity of the magnetic pole coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an axial schematic diagram of part of the magnetic poles of the present invention.

[0036] Figure 2 yes Figure 1 Schematic diagram of the AA section.

[0037] Figure 3 yes Figure 1 Schematic diagram of BB cross section.

[0038] Figure 4 yes Figure 1 Schematic diagram of CC cross section.

[0039] In the attached drawings: 1-the first cooling air route; 2-the second cooling air route; 3-the third cooling air route; 4-radial air duct between yoke sections; 5-radial air duct of the yoke fan; 6-yoke fan; 7-wind shield at the pole end; 8-radial air duct at the pole end; 9-pole core; 10-pole coil; 11-ventilation box between poles; 12-axial air duct between poles; 13-radial air duct between poles; 14-yoke section; 15-radial air duct of the pole coil; 16-circumferential air duct of the pole coil; 17-windward side; 18-leeward side; 19-radial cover plate; 20-axial vertical plate. 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

[0042] like Figure 1 As shown, a hybrid ventilation cooling method for improving the temperature difference of a magnetic pole coil comprises the following specific steps:

[0043] Step 1: Cooling air is introduced from the yoke, and the cooling air is divided into the first cooling air 1, the second cooling air 2 and the third cooling air 3 on the entire magnetic pole; the first cooling air 1 enters from the radial air duct 4 between the yoke sections at the head and tail of the yoke, and the axial heights of the head and tail of the yoke along the magnetic pole correspond to the axial heights of the head and tail of the magnetic pole along the magnetic pole respectively; the second cooling air 2 enters from the radial air duct 4 between the yoke sections in the middle of the yoke, and the axial height of the middle of the yoke along the magnetic pole corresponds to the axial height of the middle of the magnetic pole along the magnetic pole; the third cooling air 3 enters from the radial air duct 5 of the yoke fan at the upper end and the lower end of the yoke;

[0044] Step 2: If Figure 2 As shown, after the first cooling air 1 enters from the radial air duct 4 between the yoke segments, it first reaches the inter-pole ventilation box 11, then enters the radial air duct 15 of the pole coil, passes through the circumferential air duct 16 of the pole coil, and finally reaches the inter-pole axial air duct 12; after the first cooling air 1 reaches the inter-pole ventilation box 11, the first cooling air 1 can only enter the radial air duct 15 of the pole coil, then leave from the circumferential air duct 16 of the pole coil, and reach the inter-pole axial air duct 12; the first cooling air 1 passes through the radial air duct 15 of the pole coil and the circumferential air duct 16 of the pole coil, mainly to cool down the inner surface of the pole coil 10 and the inside of the pole coil 10;

[0045] Step 3: If Figure 3As shown, after the second cooling air 2 enters from the radial air duct 4 between the yoke sections, the second cooling air 2 is divided into a first portion of cooling air and a second portion of cooling air. The first portion of cooling air directly enters the radial air duct 13 between the magnetic poles, and the second portion of cooling air enters the radial air duct 15 of the magnetic pole coil, passes through the circumferential air duct 16 of the magnetic pole coil, and finally reaches the radial air duct 13 between the magnetic poles; most of the first portion of cooling air separated from the second cooling air 2 is mainly used to cool down the outer surface of the adjacent magnetic pole coil 10, and a small portion of the second portion of cooling air separated from the second cooling air 2 is used to cool down the inner surface and the interior of the magnetic pole coil 10;

[0046] Step 4: If Figure 4 As shown, after the third cooling air 3 enters from the radial air duct 5 of the yoke fan, the third cooling air 3 is divided into a third part of cooling air and a fourth part of cooling air. The third part of cooling air enters the radial air duct 8 at the pole ends to cool the outer side surfaces of the upper and lower ends of the pole coil 10, and the fourth part of cooling air enters the inter-pole axial air duct 12 to cool the axial outer surface of the pole coil 10 at the head and tail of the pole; the yoke fan 6 arranged at the upper and lower ends of the yoke can, after passing through the radial air duct 5 of the yoke fan, respectively set a pole end wind shield plate 7 above the upper end of the pole and below the lower end of the pole, whose cross section has a curved wind guide surface, which guides the third part of cooling air and the fourth part of cooling air divided by the third cooling air 3 into the radial air duct 8 at the pole ends and the inter-pole axial air duct 12.

[0047] The second step, the third step and the fourth step of the hybrid ventilation cooling method for improving the temperature difference of the pole coil 10 are performed simultaneously.

[0048] Example 2

[0049] like Figure 1 As shown, a hybrid ventilation cooling method for improving the temperature difference of a magnetic pole coil comprises the following specific steps:

[0050] Step 1: Cooling air is introduced from the yoke, and the cooling air is divided into the first cooling air 1, the second cooling air 2 and the third cooling air 3 on the entire magnetic pole; the first cooling air 1 enters from the radial air duct 4 between the yoke sections at the head and tail of the yoke, and the axial heights of the head and tail of the yoke along the magnetic pole correspond to the axial heights of the head and tail of the magnetic pole along the magnetic pole respectively; the second cooling air 2 enters from the radial air duct 4 between the yoke sections in the middle of the yoke, and the axial height of the middle of the yoke along the magnetic pole corresponds to the axial height of the middle of the magnetic pole along the magnetic pole; the third cooling air 3 enters from the radial air duct 5 of the yoke fan at the upper end and the lower end of the yoke;

[0051] Step 2: If Figure 2As shown, after the first cooling air 1 enters from the radial air duct 4 between the yoke segments, it first reaches the inter-pole ventilation box 11, then enters the radial air duct 15 of the pole coil, passes through the circumferential air duct 16 of the pole coil, and finally reaches the inter-pole axial air duct 12; after the first cooling air 1 reaches the inter-pole ventilation box 11, the first cooling air 1 can only enter the radial air duct 15 of the pole coil, then leave from the circumferential air duct 16 of the pole coil, and reach the inter-pole axial air duct 12; the first cooling air 1 passes through the radial air duct 15 of the pole coil and the circumferential air duct 16 of the pole coil, mainly to cool down the inner surface of the pole coil 10 and the inside of the pole coil 10;

[0052] Step 3: If Figure 3 As shown, after the second cooling air 2 enters from the radial air duct 4 between the yoke sections, the second cooling air 2 is divided into a first portion of cooling air and a second portion of cooling air. The first portion of cooling air directly enters the radial air duct 13 between the magnetic poles, and the second portion of cooling air enters the radial air duct 15 of the magnetic pole coil, passes through the circumferential air duct 16 of the magnetic pole coil, and finally reaches the radial air duct 13 between the magnetic poles; most of the first portion of cooling air separated from the second cooling air 2 is mainly used to cool down the outer surface of the adjacent magnetic pole coil 10, and a small portion of the second portion of cooling air separated from the second cooling air 2 is used to cool down the inner surface and the interior of the magnetic pole coil 10;

[0053] Step 4: If Figure 4 As shown, after the third cooling air 3 enters from the radial air duct 5 of the yoke fan, pole end wind shields 7 are respectively arranged above the upper end of the pole and below the lower end of the pole, and their cross sections have curved wind guide surfaces, so that the third cooling air 3 is divided into a third part of cooling air and a fourth part of cooling air. The third part of cooling air enters the pole end radial air duct 8 to cool the outer side surfaces of the upper and lower ends of the pole coil 10, and the fourth part of cooling air enters the pole inter-pole axial air duct 12 to cool the axial outer surfaces of the pole coil 10 at the pole head and the pole tail.

[0054] The second step, the third step and the fourth step of the hybrid ventilation cooling method for improving the temperature difference of the pole coil 10 are performed simultaneously.

[0055] like Figure 1 As shown, the yoke includes a plurality of yoke segments 14, and the radial air ducts 4 between the yoke segments are a plurality of gaps formed between the plurality of yoke segments 14; the pole coil radial air ducts 15 are gaps formed between the inner side surface of the pole coil 10 and the pole core 9; the pole coil circumferential air ducts 16 are a plurality of channels opened on the pole coil 10, and the plurality of channels are all connected with the pole coil radial air ducts 15 and the inter-pole radial air ducts 13 formed between the outer surfaces of adjacent pole coils 10; the opening of a plurality of pole coil circumferential air ducts 16 allows more cooling air to enter the interior of the pole coil 10, thereby effectively cooling the interior of the entire pole coil 10.

[0056] like Figure 1 As shown, the total number of radial air ducts 4 between yoke sections on the yoke is the sum of the number of radial air ducts 4 between yoke sections at the yoke head, the yoke tail and the middle of the yoke; all radial air ducts 4 between yoke sections have the first cooling air 1 or the second cooling air 2 entering; the total number of radial air ducts 4 between yoke sections on the yoke ranges from 5 to 12, and the total number of radial air ducts 4 between yoke sections is adjusted accordingly according to the ventilation requirements; the air volume distribution ratio of the first cooling air 1, the second cooling air 2 and the third cooling air 3 is 2:3:5, and the specific setting method of the structure to achieve air volume distribution is: the axial height of the radial air ducts 4 between yoke sections is set to 60mm, and the total number of radial air ducts 4 between yoke sections is 7, 2 radial air ducts 4 between yoke sections are respectively set at the yoke head and the yoke tail, and 3 radial air ducts between yoke sections are set at the middle of the yoke; a single The height of the inter-pole ventilation box is 1 / 3 of the total axial height of the pole. An inter-pole ventilation box is respectively arranged at the head and the tail of the pole, and corresponds to the radial air duct 4 between the yoke sections at the head and the tail of the yoke; the axial height of the yoke fan radial air duct 5 is set to 150mm, and a yoke fan radial air duct 5 is respectively arranged at the upper end and the lower end of the yoke; the circumferential width of the pole coil radial air duct 15 is set to 8mm, and the pole coil circumferential air duct 16 is evenly arranged along the axial direction and radial direction of the pole coil, and its ventilation surface area is 20% of the heat dissipation area of ​​the outer surface of the pole coil; the above-mentioned air volume distribution ratio of the first cooling air 1, the second cooling air 2 and the third cooling air 3 is 2:3:5, which is only one distribution method. Various air volume distribution ratios can also be adjusted according to the cooling requirements of the pole, which will not be repeated here.

[0057] like Figure 2 As shown, the pole coil circumferential wind ducts 16 on the windward side 17 and the leeward side 18 of the pole coil 10 can be set in unequal numbers. For example, the number of the pole coil circumferential wind ducts 16 on the leeward side 18 of the pole coil 10 is set to be greater than the number of the pole coil circumferential wind ducts 16 on the windward side 17 of the pole coil 10, thereby further reducing the difference in cooling effect between the leeward side 18 and the windward side 17 of the pole coil 10 caused by the rotor rotation direction, thereby improving the uniformity of the pole temperature rise.

[0058] Example 3

[0059] like Figure 1 As shown, a hybrid ventilation cooling method for improving the temperature difference of a magnetic pole coil comprises the following specific steps:

[0060] Step 1: Cooling air is introduced from the yoke, and the cooling air is divided into the first cooling air 1, the second cooling air 2 and the third cooling air 3 on the entire magnetic pole; the first cooling air 1 enters from the radial air duct 4 between the yoke sections at the head and tail of the yoke, and the axial heights of the head and tail of the yoke along the magnetic pole correspond to the axial heights of the head and tail of the magnetic pole along the magnetic pole respectively; the second cooling air 2 enters from the radial air duct 4 between the yoke sections in the middle of the yoke, and the axial height of the middle of the yoke along the magnetic pole corresponds to the axial height of the middle of the magnetic pole along the magnetic pole; the third cooling air 3 enters from the radial air duct 5 of the yoke fan at the upper end and the lower end of the yoke;

[0061] Step 2: If Figure 2 As shown, after the first cooling air 1 enters from the radial air duct 4 between the yoke segments, it first reaches the inter-pole ventilation box 11, then enters the radial air duct 15 of the pole coil, passes through the circumferential air duct 16 of the pole coil, and finally reaches the inter-pole axial air duct 12; after the first cooling air 1 reaches the inter-pole ventilation box 11, the first cooling air 1 can only enter the radial air duct 15 of the pole coil, then leave from the circumferential air duct 16 of the pole coil, and reach the inter-pole axial air duct 12; the first cooling air 1 passes through the radial air duct 15 of the pole coil and the circumferential air duct 16 of the pole coil, mainly to cool down the inner surface of the pole coil 10 and the inside of the pole coil 10;

[0062] Step 3: If Figure 3 As shown, after the second cooling air 2 enters from the radial air duct 4 between the yoke sections, the second cooling air 2 is divided into a first portion of cooling air and a second portion of cooling air. The first portion of cooling air directly enters the radial air duct 13 between the magnetic poles, and the second portion of cooling air enters the radial air duct 15 of the magnetic pole coil, passes through the circumferential air duct 16 of the magnetic pole coil, and finally reaches the radial air duct 13 between the magnetic poles; most of the first portion of cooling air separated from the second cooling air 2 is mainly used to cool down the outer surface of the adjacent magnetic pole coil 10, and a small portion of the second portion of cooling air separated from the second cooling air 2 is used to cool down the inner surface and the interior of the magnetic pole coil 10;

[0063] Step 4: If Figure 4 As shown, after the third cooling air 3 enters from the radial air duct 5 of the yoke fan, pole end wind shields 7 are respectively arranged above the upper end of the pole and below the lower end of the pole, and their cross sections have curved wind guide surfaces, so that the third cooling air 3 is divided into a third part of cooling air and a fourth part of cooling air. The third part of cooling air enters the pole end radial air duct 8 to cool the outer side surfaces of the upper and lower ends of the pole coil 10, and the fourth part of cooling air enters the pole inter-pole axial air duct 12 to cool the axial outer surfaces of the pole coil 10 at the pole head and the pole tail.

[0064] The second step, the third step and the fourth step of the hybrid ventilation cooling method for improving the temperature difference of the pole coil 10 are performed simultaneously.

[0065] like Figure 2 As shown, there are two inter-pole ventilation boxes 11 in step 2, and each inter-pole ventilation box 11 is composed of a wind shield, adjacent pole coils 10 and a yoke; the adjacent pole coils 10 are located on the outer diameter side of the yoke; the wind shield is installed between adjacent pole coils 10, and the wind shield is connected to the yoke at both ends along the axial direction of the pole; the ventilation space inside each inter-pole ventilation box 11 only leaves a channel for the first cooling air 1 to enter the radial air duct 15 of the pole coil, and guides the first cooling air 1 to cool the inner surface of the pole coil 10 at the head and tail of the pole; as shown Figure 1 and Figure 4 As shown, the windshield includes two radial cover plates 19 and an axial vertical plate 20; the axial vertical plate 20 is installed between adjacent pole coils 10, and the two ends of the axial vertical plate 20 along the axial direction of the pole are respectively connected to a radial cover plate 19; the two radial cover plates 19 are both connected to the yoke; the height of the windshield along the axial direction of the pole is 1 / 4~1 / 3 of the height of the pole, and the height of the inter-pole ventilation box formed by the windshield, adjacent pole coils 10 and the yoke is 1 / 4~1 / 3 of the height of the pole; the height of the head of the pole along the axial direction of the pole is equal to the height of the tail of the pole along the axial direction of the pole, and the height of the head and tail of the pole along the axial direction of the pole are both 1 / 4~1 / 3 of the height of the pole; the height of the middle part of the pole along the axial direction of the pole is 1 / 3~1 / 2 of the height of the pole. As shown Figure 1 and Figure 2As shown, two wind shields are respectively arranged at the head and tail of the pole, and the height of the wind shield on the pole can be extended or shortened according to the requirements of the inner surface and internal cooling of the pole coil 10 at the head and tail of the pole, so as to guide the first cooling wind 1 to cool the inner surface and internal of the pole coil 10 at the head and tail of the pole; the height of the head, tail and middle part of the pole along the axial direction of the pole is adjusted according to the height adjustment of the wind shield, the adjacent pole coils 10 and the pole interpole ventilation box 11 surrounded by the yoke, and the specific adjustment method is: make the height of the head and tail of the pole equal to the corresponding pole interpole ventilation box 11, and the head and tail of the pole are respectively aligned with the corresponding pole interpole ventilation box 11 along the pole axis. The height positions in the axial direction are the same; since the heights of the yoke head, the middle part of the yoke and the tail of the yoke are respectively equal to the heights of the pole head, the middle part of the pole and the tail of the pole in the axial direction of the pole and the height positions are the same, when the height of the inter-pole ventilation box 11 is adjusted, the heights of the yoke head, the yoke tail and the middle part of the yoke should also be adjusted, and the pole head, the pole tail and the middle part of the pole are adjusted in the same height change; for example, the heights of the inter-pole ventilation box 11 at the pole head and tail are both 1 / 4 of the pole height, then the heights of the pole head and the yoke tail are both 1 / 4 of the pole height, the height of the middle part of the pole is 1 / 2 of the pole height, and the heights of the yoke head and the yoke tail are both 1 / 4 of the pole height, and the height of the yoke middle part is 1 / 2 of the pole height.

[0066] Example 4

[0067] like Figure 1 As shown, a hybrid ventilation cooling method for improving the temperature difference of a magnetic pole coil comprises the following specific steps:

[0068] Step 1: Cooling air is introduced from the yoke, and the cooling air is divided into the first cooling air 1, the second cooling air 2 and the third cooling air 3 on the entire magnetic pole; the first cooling air 1 enters from the radial air duct 4 between the yoke sections at the head and tail of the yoke, and the axial heights of the head and tail of the yoke along the magnetic pole correspond to the axial heights of the head and tail of the magnetic pole along the magnetic pole respectively; the second cooling air 2 enters from the radial air duct 4 between the yoke sections in the middle of the yoke, and the axial height of the middle of the yoke along the magnetic pole corresponds to the axial height of the middle of the magnetic pole along the magnetic pole; the third cooling air 3 enters from the radial air duct 5 of the yoke fan at the upper end and the lower end of the yoke;

[0069] Step 2: If Figure 2As shown, after the first cooling air 1 enters from the radial air duct 4 between the yoke segments, it first reaches the inter-pole ventilation box 11, then enters the radial air duct 15 of the pole coil, passes through the circumferential air duct 16 of the pole coil, and finally reaches the inter-pole axial air duct 12; after the first cooling air 1 reaches the inter-pole ventilation box 11, the first cooling air 1 can only enter the radial air duct 15 of the pole coil, then leave from the circumferential air duct 16 of the pole coil, and reach the inter-pole axial air duct 12; the first cooling air 1 passes through the radial air duct 15 of the pole coil and the circumferential air duct 16 of the pole coil, mainly to cool down the inner surface of the pole coil 10 and the inside of the pole coil 10;

[0070] Step 3: If Figure 3 As shown, after the second cooling air 2 enters from the radial air duct 4 between the yoke sections, the second cooling air 2 is divided into a first portion of cooling air and a second portion of cooling air. The first portion of cooling air directly enters the radial air duct 13 between the magnetic poles, and the second portion of cooling air enters the radial air duct 15 of the magnetic pole coil, passes through the circumferential air duct 16 of the magnetic pole coil, and finally reaches the radial air duct 13 between the magnetic poles; most of the first portion of cooling air separated from the second cooling air 2 is mainly used to cool down the outer surface of the adjacent magnetic pole coil 10, and a small portion of the second portion of cooling air separated from the second cooling air 2 is used to cool down the inner surface and the interior of the magnetic pole coil 10;

[0071] Step 4: If Figure 4 As shown, after the third cooling air 3 enters from the radial air duct 5 of the yoke fan, pole end wind shields 7 are respectively arranged above the upper end of the pole and below the lower end of the pole, and their cross sections have curved wind guide surfaces, so that the third cooling air 3 is divided into a third part of cooling air and a fourth part of cooling air. The third part of cooling air enters the pole end radial air duct 8 to cool the outer side surfaces of the upper and lower ends of the pole coil 10, and the fourth part of cooling air enters the pole inter-pole axial air duct 12 to cool the axial outer surfaces of the pole coil 10 at the pole head and the pole tail.

[0072] The second step, the third step and the fourth step of the hybrid ventilation cooling method for improving the temperature difference of the pole coil 10 are performed simultaneously.

[0073] like Figure 1 As shown, the inter-pole radial air duct 13 in step three is located in the middle of the pole, and is a channel formed along the radial direction of the pole coil 10 between the outer surfaces of adjacent pole coils 10. The channel is located in the middle of the pole, and is not blocked by the windshield of the inter-pole ventilation box 11. After the second cooling air 2 enters from the radial air duct 4 between the yoke sections, most of the first part of the cooling air separated from the second cooling air 2 directly reaches this part of the channel; the third cooling air 3 is provided by the yoke fan 6 arranged at the upper and lower ends of the yoke, and the yoke fan radial air duct 5 is arranged inside the yoke fan 6, and the height range of the yoke fan 6 is 100mm~200mm.

[0074] like Figure 1 As shown, the inter-pole axial wind duct 12 is a channel formed along the axial direction of the pole coil 10 between the outer surfaces of the adjacent pole coils 10 at the head and tail of the pole; the pole end radial wind duct 8 in step four is a channel formed between the pole end wind shield 7 and the upper end of the pole and a channel formed between the pole end wind shield 7 and the lower end of the pole; the third cooling air 3 is guided into the inter-pole axial wind duct 12 through the pole end wind shields 7 respectively arranged above the upper end of the pole and below the lower end of the pole.

[0075] Example 5

[0076] like Figure 1 As shown, a hybrid ventilation cooling method for improving the temperature difference of a magnetic pole coil comprises the following specific steps:

[0077] Step 1: Cooling air is introduced from the yoke, and the cooling air is divided into the first cooling air 1, the second cooling air 2 and the third cooling air 3 on the entire magnetic pole; the first cooling air 1 enters from the radial air duct 4 between the yoke sections at the head and tail of the yoke, and the axial heights of the head and tail of the yoke along the magnetic pole correspond to the axial heights of the head and tail of the magnetic pole along the magnetic pole respectively; the second cooling air 2 enters from the radial air duct 4 between the yoke sections in the middle of the yoke, and the axial height of the middle of the yoke along the magnetic pole corresponds to the axial height of the middle of the magnetic pole along the magnetic pole; the third cooling air 3 enters from the radial air duct 5 of the yoke fan at the upper end and the lower end of the yoke;

[0078] Step 2: If Figure 2 As shown, after the first cooling air 1 enters from the radial air duct 4 between the yoke segments, it first reaches the inter-pole ventilation box 11, then enters the radial air duct 15 of the pole coil, passes through the circumferential air duct 16 of the pole coil, and finally reaches the inter-pole axial air duct 12; after the first cooling air 1 reaches the inter-pole ventilation box 11, the first cooling air 1 can only enter the radial air duct 15 of the pole coil, then leave from the circumferential air duct 16 of the pole coil, and reach the inter-pole axial air duct 12; the first cooling air 1 passes through the radial air duct 15 of the pole coil and the circumferential air duct 16 of the pole coil, mainly to cool down the inner surface of the pole coil 10 and the inside of the pole coil 10;

[0079] Step 3: If Figure 3As shown, after the second cooling air 2 enters from the radial air duct 4 between the yoke sections, the second cooling air 2 is divided into a first portion of cooling air and a second portion of cooling air. The first portion of cooling air directly enters the radial air duct 13 between the magnetic poles, and the second portion of cooling air enters the radial air duct 15 of the magnetic pole coil, passes through the circumferential air duct 16 of the magnetic pole coil, and finally reaches the radial air duct 13 between the magnetic poles; most of the first portion of cooling air separated from the second cooling air 2 is mainly used to cool down the outer surface of the adjacent magnetic pole coil 10, and a small portion of the second portion of cooling air separated from the second cooling air 2 is used to cool down the inner surface and the interior of the magnetic pole coil 10;

[0080] Step 4: If Figure 4 As shown, after the third cooling air 3 enters from the radial air duct 5 of the yoke fan, pole end wind shields 7 are respectively arranged above the upper end of the pole and below the lower end of the pole, and their cross sections have curved wind guide surfaces, so that the third cooling air 3 is divided into a third part of cooling air and a fourth part of cooling air. The third part of cooling air enters the pole end radial air duct 8 to cool the outer side surfaces of the upper and lower ends of the pole coil 10, and the fourth part of cooling air enters the pole inter-pole axial air duct 12 to cool the axial outer surfaces of the pole coil 10 at the pole head and the pole tail.

[0081] The second step, the third step and the fourth step of the hybrid ventilation cooling method for improving the temperature difference of the pole coil 10 are performed simultaneously.

[0082] like Figure 1 As shown, the yoke includes a plurality of yoke segments 14, and the radial air ducts 4 between the yoke segments are a plurality of gaps formed between the plurality of yoke segments 14; the pole coil radial air ducts 15 are gaps formed between the inner side surface of the pole coil 10 and the pole core 9; the pole coil circumferential air ducts 16 are a plurality of channels opened on the pole coil 10, and the plurality of channels are all connected with the pole coil radial air ducts 15 and the inter-pole radial air ducts 13 formed between the outer surfaces of adjacent pole coils 10; the opening of a plurality of pole coil circumferential air ducts 16 allows more cooling air to enter the interior of the pole coil 10, thereby effectively cooling the interior of the entire pole coil 10.

[0083] like Figure 1As shown, the total number of radial air ducts 4 between yoke sections on the yoke is the sum of the number of radial air ducts 4 between yoke sections at the yoke head, the yoke tail and the middle of the yoke; all radial air ducts 4 between yoke sections have the first cooling air 1 or the second cooling air 2 entering; the total number of radial air ducts 4 between yoke sections on the yoke ranges from 5 to 12, and the total number of radial air ducts 4 between yoke sections is adjusted accordingly according to the ventilation requirements; the air volume distribution ratio of the first cooling air 1, the second cooling air 2 and the third cooling air 3 is 2:3:5, and the specific setting method of the structure to achieve air volume distribution is: the axial height of the radial air ducts 4 between yoke sections is set to 60mm, and the total number of radial air ducts 4 between yoke sections is 7, 2 radial air ducts 4 between yoke sections are respectively set at the yoke head and the yoke tail, and 3 radial air ducts between yoke sections are set at the middle of the yoke; a single The height of the inter-pole ventilation box is 1 / 3 of the total axial height of the pole. An inter-pole ventilation box is respectively arranged at the head and the tail of the pole, and corresponds to the radial air duct 4 between the yoke sections at the head and the tail of the yoke; the axial height of the yoke fan radial air duct 5 is set to 150mm, and a yoke fan radial air duct 5 is respectively arranged at the upper end and the lower end of the yoke; the circumferential width of the pole coil radial air duct 15 is set to 8mm, and the pole coil circumferential air duct 16 is evenly arranged along the axial direction and radial direction of the pole coil, and its ventilation surface area is 20% of the heat dissipation area of ​​the outer surface of the pole coil; the above-mentioned air volume distribution ratio of the first cooling air 1, the second cooling air 2 and the third cooling air 3 is 2:3:5, which is only one distribution method. Various air volume distribution ratios can also be adjusted according to the cooling requirements of the pole, which will not be repeated here.

[0084] like Figure 2 As shown, the pole coil circumferential wind ducts 16 on the windward side 17 and the leeward side 18 of the pole coil 10 can be set in unequal numbers. For example, the number of the pole coil circumferential wind ducts 16 on the leeward side 18 of the pole coil 10 is set to be greater than the number of the pole coil circumferential wind ducts 16 on the windward side 17 of the pole coil 10, thereby further reducing the difference in cooling effect between the leeward side 18 and the windward side 17 of the pole coil 10 caused by the rotor rotation direction, thereby improving the uniformity of the pole temperature rise.

[0085] like Figure 2 As shown, there are two inter-pole ventilation boxes 11 in step 2, and each inter-pole ventilation box 11 is composed of a wind shield, adjacent pole coils 10 and a yoke; the adjacent pole coils 10 are located on the outer diameter side of the yoke; the wind shield is installed between adjacent pole coils 10, and the wind shield is connected to the yoke at both ends along the axial direction of the pole; the ventilation space inside each inter-pole ventilation box 11 only leaves a channel for the first cooling air 1 to enter the radial air duct 15 of the pole coil, and guides the first cooling air 1 to cool the inner surface of the pole coil 10 at the head and tail of the pole; as shown Figure 1 and Figure 4As shown, the windshield includes two radial cover plates 19 and an axial vertical plate 20; the axial vertical plate 20 is installed between adjacent pole coils 10, and the two ends of the axial vertical plate 20 along the axial direction of the pole are respectively connected to a radial cover plate 19; the two radial cover plates 19 are both connected to the yoke; the height of the windshield along the axial direction of the pole is 1 / 4~1 / 3 of the height of the pole, and the height of the inter-pole ventilation box formed by the windshield, adjacent pole coils 10 and the yoke is 1 / 4~1 / 3 of the height of the pole; the height of the head of the pole along the axial direction of the pole is equal to the height of the tail of the pole along the axial direction of the pole, and the height of the head and tail of the pole along the axial direction of the pole are both 1 / 4~1 / 3 of the height of the pole; the height of the middle part of the pole along the axial direction of the pole is 1 / 3~1 / 2 of the height of the pole. As shown Figure 1 and Figure 2 As shown, two wind shields are respectively arranged at the head and tail of the pole, and the height of the wind shield on the pole can be extended or shortened according to the requirements of the inner surface and internal cooling of the pole coil 10 at the head and tail of the pole, so as to guide the first cooling wind 1 to cool the inner surface and internal of the pole coil 10 at the head and tail of the pole; the height of the head, tail and middle part of the pole along the axial direction of the pole is adjusted according to the height adjustment of the wind shield, the adjacent pole coils 10 and the pole interpole ventilation box 11 surrounded by the yoke, and the specific adjustment method is: make the height of the head and tail of the pole equal to the corresponding pole interpole ventilation box 11, and the head and tail of the pole are respectively aligned with the corresponding pole interpole ventilation box 11 along the pole axis. The height positions in the axial direction are the same; since the heights of the yoke head, the middle part of the yoke and the tail of the yoke are respectively equal to the heights of the pole head, the middle part of the pole and the tail of the pole in the axial direction of the pole and the height positions are the same, when the height of the inter-pole ventilation box 11 is adjusted, the heights of the yoke head, the yoke tail and the middle part of the yoke should also be adjusted, and the pole head, the pole tail and the middle part of the pole are adjusted in the same height change; for example, the heights of the inter-pole ventilation box 11 at the pole head and tail are both 1 / 4 of the pole height, then the heights of the pole head and the yoke tail are both 1 / 4 of the pole height, the height of the middle part of the pole is 1 / 2 of the pole height, and the heights of the yoke head and the yoke tail are both 1 / 4 of the pole height, and the height of the yoke middle part is 1 / 2 of the pole height.

[0086] like Figure 1As shown, the inter-pole radial air duct 13 in step three is located in the middle of the pole, and is a channel formed along the radial direction of the pole coil 10 between the outer surfaces of adjacent pole coils 10. The channel is located in the middle of the pole, and is not blocked by the windshield of the inter-pole ventilation box 11. After the second cooling air 2 enters from the radial air duct 4 between the yoke sections, most of the first part of the cooling air separated from the second cooling air 2 directly reaches this part of the channel; the third cooling air 3 is provided by the yoke fan 6 arranged at the upper and lower ends of the yoke, and the yoke fan radial air duct 5 is arranged inside the yoke fan 6, and the height range of the yoke fan 6 is 100mm~200mm.

[0087] like Figure 1 As shown, the inter-pole axial wind duct 12 is a channel formed along the axial direction of the pole coil 10 between the outer surfaces of the adjacent pole coils 10 at the head and tail of the pole; the pole end radial wind duct 8 in step four is a channel formed between the pole end wind shield 7 and the upper end of the pole and a channel formed between the pole end wind shield 7 and the lower end of the pole; the third cooling air 3 is guided into the inter-pole axial wind duct 12 through the pole end wind shields 7 respectively arranged above the upper end of the pole and below the lower end of the pole.

[0088] 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 mixed ventilation cooling method for improving the temperature difference of magnetic pole coils, characterized in that: The specific steps include: Step 1: Cooling air is introduced from the yoke, and the cooling air is divided into a first cooling air path (1), a second cooling air path (2) and a third cooling air path (3) on the entire magnetic pole; wherein the first cooling air path (1) enters from the radial air duct (4) between the yoke segments at the head and tail of the yoke, and the axial heights of the head and tail of the yoke along the magnetic pole correspond to the axial heights of the head and tail of the magnetic pole respectively; the second cooling air path (2) enters from the radial air duct (4) between the yoke segments at the middle of the yoke, and the axial height of the middle of the yoke along the magnetic pole corresponds to the axial height of the middle of the magnetic pole along the magnetic pole; the third cooling air path (3) enters from the radial air duct (5) of the yoke fan at the upper end and the lower end of the yoke; Step 2: After the first cooling air (1) enters from the radial air duct (4) between the yoke segments, it first reaches the inter-pole ventilation box (11), then enters the radial air duct (15) of the pole coil, passes through the circumferential air duct (16) of the pole coil, and finally reaches the inter-pole axial air duct (12); Step 3: After the second cooling air (2) enters from the radial air duct (4) between the yoke segments, the second cooling air (2) is divided into a first portion of cooling air and a second portion of cooling air. The first portion of cooling air directly enters the radial air duct (13) between the magnetic poles, and the second portion of cooling air enters the radial air duct (15) of the magnetic pole coil, passes through the circumferential air duct (16) of the magnetic pole coil, and finally reaches the radial air duct (13) between the magnetic poles. Step 4: After the third cooling air (3) enters from the radial air duct (5) of the yoke fan, a pole end wind shield (7) is respectively arranged above the upper end of the pole and below the lower end of the pole, and its cross section has a curved air guide surface, so that the third cooling air (3) is divided into a third portion of cooling air and a fourth portion of cooling air. The third portion of cooling air enters the pole end radial air duct (8) to cool the outer side surfaces of the upper and lower ends of the pole coil (10), and the fourth portion of cooling air enters the pole inter-pole axial air duct (12) to cool the axial outer surfaces of the pole coil (10) at the head and tail of the pole. There are two inter-pole ventilation boxes (11) in step 2, each of which is composed of a windshield, adjacent pole coils (10) and a yoke; the adjacent pole coils (10) are located on the outer diameter side of the yoke; the windshield is installed between adjacent pole coils (10), and the windshield is connected to the yoke at both ends along the axial direction of the pole; the windshield includes two radial cover plates (19) and an axial vertical plate (20); the axial vertical plate (20) is installed between adjacent pole coils (10), and the axial vertical plate (20) is connected to a radial cover plate (19) at both ends along the axial direction of the pole; the two Each radial cover plate (19) is connected to the magnetic yoke; the height of the windshield along the axial direction of the magnetic pole is 1 / 4 to 1 / 3 of the height of the magnetic pole, and the height of the inter-pole ventilation box formed by the windshield, the adjacent magnetic pole coils (10) and the magnetic yoke is 1 / 4 to 1 / 3 of the height of the magnetic pole; the height of the magnetic pole head along the axial direction of the magnetic pole is equal to the height of the magnetic pole tail along the axial direction of the magnetic pole, and the heights of the magnetic pole head and the magnetic pole tail along the axial direction of the magnetic pole are both 1 / 4 to 1 / 3 of the height of the magnetic pole; the height of the magnetic pole middle along the axial direction of the magnetic pole is 1 / 3 to 1 / 2 of the height of the magnetic pole; two windshields are respectively arranged at the magnetic pole head and the magnetic pole tail.

2. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The magnetic yoke comprises a plurality of magnetic yoke segments (14), and the radial air ducts (4) between the magnetic yoke segments are a plurality of gaps formed between the plurality of magnetic yoke segments (14).

3. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The magnetic pole coil radial air duct (15) is a gap formed between the inner side surface of the magnetic pole coil (10) and the magnetic pole core (9).

4. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The magnetic pole coil circumferential air duct (16) is a plurality of channels opened on the magnetic pole coil (10), and the plurality of channels are connected to the magnetic pole coil radial air duct (15) and the magnetic pole inter-pole radial air duct (13) formed between the outer surfaces of adjacent magnetic pole coils (10).

5. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 2, characterized in that: The total number of radial air ducts (4) between yoke segments on the yoke is the sum of the number of radial air ducts (4) between yoke segments at the head of the yoke, the tail of the yoke and the middle of the yoke.

6. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 5, characterized in that: The total number of radial air ducts (4) between the yoke segments on the yoke ranges from 5 to 12.

7. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The inter-pole radial air duct (13) in step three is a channel located in the middle of the magnetic pole and formed along the radial direction of the magnetic pole coil (10) between the outer surfaces of adjacent magnetic pole coils (10).

8. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The third cooling air (3) is provided by a yoke fan (6) arranged at the upper end and the lower end of the yoke, and the yoke fan radial air duct (5) is arranged inside the yoke fan (6).

9. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 8, characterized in that: The height of the yoke fan (6) ranges from 100 mm to 200 mm.

10. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The inter-pole axial air duct (12) is a channel formed along the axial direction of the magnetic pole coil (10) between the outer surfaces of adjacent magnetic pole coils (10) at the magnetic pole head and the magnetic pole tail.

11. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The magnetic pole end radial wind channel (8) in step 4 is a channel formed between the magnetic pole end wind shield (7) and the upper end of the magnetic pole, and a channel formed between the magnetic pole end wind shield (7) and the lower end of the magnetic pole.

12. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 1, characterized in that: The third cooling air (3) is guided into the inter-pole axial air duct (12) through the pole end wind shields (7) provided at the upper and lower ends of the poles.

13. A mixed ventilation cooling method for improving the temperature difference of magnetic pole coils according to claim 9, characterized in that: The air volume distribution ratio of the first cooling air (1), the second cooling air (2) and the third cooling air (3) is 2:3:5, and the specific configuration of the structure for realizing the air volume distribution is as follows: the axial height of the radial air duct (4) between the yoke segments is set to 60 mm, and the total number of the radial air ducts (4) between the yoke segments is 7, 2 radial air ducts (4) between the yoke segments are respectively set at the head and the tail of the yoke, and 3 radial air ducts between the yoke segments are set at the middle of the yoke; the height of the ventilation box between the poles of a single pole is 1 / 3 of the total axial height of the pole, and the head and the tail of the pole are 1 / 3 of the total axial height of the pole. An inter-pole ventilation box is provided at each end, and corresponds to the inter-segment radial air duct (4) at the head and tail of the yoke; the axial height of the yoke fan radial air duct (5) is set to 150 mm, and a yoke fan radial air duct (5) is provided at the upper end and the lower end of the yoke; the circumferential width of the pole coil radial air duct (15) is set to 8 mm, and the pole coil circumferential air duct (16) is evenly arranged along the axial direction and radial direction of the pole coil (10), and its ventilation surface area is 20% of the heat dissipation area of ​​the outer surface of the pole coil (10).

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