High-altitude long-iron-core wind power motor stator partition cooling method

Abstract

The invention discloses a high-altitude long-iron-core wind power motor stator partition cooling method, and relates to the technical field of permanent magnet direct drive wind power motor ventilation cooling, and a cooling air path comprises one path of air for cooling a stator close to a non-driving end, and the other path of air for cooling a stator close to a driving end. And the third path of air flows around the air gap to cool the middle part of the stator, and each section of stator iron core and a stator coil positioned at each section of stator iron core obtain sufficient and uniform cooling air, so that the cooling effect is improved, the temperature difference of the stator is reduced, and the utilization efficiency of the cooling air is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation and cooling of permanent magnet direct-drive wind turbines, and in particular to a method for zoning cooling of stators of long-core wind turbines at high altitudes, which is suitable for large-capacity permanent magnet low-speed wind turbines at high altitudes. Background Art

[0002] The speed of low-speed permanent magnet wind turbine motor is low, only about 10r / min, and the pressure generated by the rotating parts is only a few Pa, which cannot drive the air to flow inside the motor to remove the loss of motor operation. Generally, a special fan is used as the main pressure source for air flow. For large-capacity permanent magnet low-speed wind turbine motors, the iron core is longer, and the iron core radial ventilation method is adopted. After the cooling air passes through the stator, it enters the air gap and diffuses to both ends of the iron core. Finally, it passes through the stator winding end and the ventilation duct. The iron core is longer, and the ventilation path for the part that directly cools the stator is long. In addition, due to structural limitations, it is generally impossible to evenly arrange the fan around the base. As a result, due to the uneven circumferential temperature distribution of the stator coil and the iron core, the circumferential temperature difference can reach 30K-40K, which makes it difficult to further increase the electromagnetic load and affects the economic efficiency of the motor.

[0003] For example, in the Chinese patent, the authorization announcement number is CN110429747B, the authorization announcement date is November 20, 2020, and the name is a method for reducing the circumferential temperature difference between the motor coil and the core. In this method, cooling air enters the large cavity from the air inlet duct below. The cooling air enters the air gap from the large cavity and cools the end of the stator core at the same time. The cooling air enters the air gap for turbulence and enters the stator ventilation groove for heat exchange. However, the stator core is relatively long. During the journey of the cooling air flowing from the air gap at one end of the stator to the other end of the stator, the temperature of the cooling air is affected by the heat dissipated by the stator core, stator coil, and rotor magnetic steel. The cooling air temperature gradually increases. The temperature of the cooling air gradually increases, and the cooling effect on the stator end is not significant. The longer the stroke, the higher the temperature of the cooling air flowing to the stator ventilation groove, resulting in uneven cooling of each section of the stator core and low cooling efficiency. The cooling air enters the air inlet cavity from the large cavity. Due to the small radial size of the air inlet cavity, the wind resistance is large, and the amount of cooling air entering is small. On the one hand, the direct contact time with the stator core is short, the time for heat exchange is short, and the heat exchange efficiency is low. On the other hand, when the cooling air flows from one end of the air inlet cavity to the other end, it is affected by the heat dissipated by the stator core and the stator coil. The cooling air temperature gradually increases, resulting in uneven cooling of each section of the stator core and low cooling efficiency.

[0004] Especially for large-capacity permanent magnet low-speed wind turbines at high altitudes, cooling is more difficult due to the low air density, further limiting the increase in the electromagnetic load of the motor. Summary of the invention

[0005] In order to solve the above-mentioned deficiencies of the prior art, the present invention provides a method for zoning cooling of a stator of a high-altitude long-core wind turbine, which is suitable for high-altitude large-capacity permanent magnet low-speed wind turbine.

[0006] The present invention is implemented by the following calculation scheme: A method for cooling the stator of a high-altitude long-core wind turbine motor by partitioning, characterized in that: after the cooling air enters the first pressure-equalizing cavity from the first ventilation duct, it is dispersed in the circumferential direction, flows to the radial ventilation ducts distributed on the circumference of the stator core corresponding to the first pressure-equalizing cavity to the air gap, and then enters the fourth space to cool the non-driving end of the stator coil, and at the same time, the cooling air flows from the fourth space to the fifth space; After the cooling air enters the third pressure-equalizing chamber from the second ventilation duct, it is also dispersed in the circumferential direction, flows to the radial ventilation duct distributed on the circumference of the stator core corresponding to the third pressure-equalizing chamber to the air gap, and then enters the sixth space to cool the driving end of the stator coil. At the same time, the cooling air enters the third space from the sixth space, and then flows to the fifth space; After the cooling air enters the second equalizing pressure chamber from the third ventilation duct, it disperses in the circumferential direction and enters the air inlet chamber, flows to the radial ventilation ducts distributed on the circumference of the stator core corresponding to the air inlet chamber to the air gap, flows through the air gap to the radial ventilation ducts distributed on the circumference corresponding to the first air outlet chamber and the second air outlet chamber, enters the first air outlet chamber and the second air outlet chamber, the cooling air in the first air outlet chamber enters the first space, the second space, and the fifth space, the cooling air in the second air outlet chamber flows to the second space and the fifth space; at this point, the three winds converge in the fifth space and are discharged through the air outlet duct installed on the fifth space.

[0007] A cavity is formed between the stator core and the stator base, and a third ring plate is installed on the stator base, which divides the cavity into two left and right chambers; a plurality of axial ribs are arranged at intervals in the cavity, and the axial ribs divide the cavity into a plurality of axial chambers, and the axial chambers are evenly distributed along the circumference of the stator base. A portion of the plurality of axial chambers are air inlet chambers, and a portion are air outlet chambers. The air inlet chambers and the air outlet chambers are arranged adjacent to each other and evenly distributed along the circumference; a ventilation channel is provided on the third ring plate of the air inlet chamber, so that the air inlet chamber is formed into an axially longer air inlet chamber; the air outlet chamber is divided into a first air outlet chamber and a second air outlet chamber by the third ring plate; a fourth space is arranged at the non-driving end of the stator coil, and a fifth space is arranged below the fourth space and is connected to the fourth space; a first pressure equalizing chamber and a second pressure equalizing chamber are arranged between the fifth space and the axial cavity, and a second pressure equalizing chamber is arranged between the second space and the axial cavity. The pressure equalizing chamber is connected with the air inlet chamber, and a third pressure equalizing chamber is arranged adjacent to the driving end of the axial chamber near the stator coil. The first ventilation duct, the second ventilation duct and the third ventilation duct are installed in the fifth space; the air outlet of the first ventilation duct is placed in the first pressure equalizing chamber and is connected with the first pressure equalizing chamber; the air outlet of the second ventilation duct passes through the air inlet chamber and is placed in the third pressure equalizing chamber and is connected with the third pressure equalizing chamber; the air outlet of the third ventilation duct is placed in the second pressure equalizing chamber and is connected with the second pressure equalizing chamber; the first space and the second space are arranged below the cavity body, the first air outlet chamber is connected with the first space, the second air outlet chamber is connected with the second space, the first space is connected with the second space, and the second space is connected with the fifth space; the sixth space and the third space are installed below the first space and the second space, the sixth space is connected with the third space, and the third space is connected with the fifth space.

[0008] Furthermore, the stator frame includes a first ring plate, a second ring plate, a third ring plate, a fourth ring plate, a fifth ring plate and a plurality of axial rib plates which are sequentially arranged on the inner diameter side back of the stator core, a sixth ring plate is arranged between the second ring plate and the third ring plate, one end of the sixth ring plate is connected to the second ring plate, and the other end is connected to the third ring plate; a seventh ring plate is arranged between the third ring plate and the fifth ring plate, one end of the seventh ring plate is connected to the third ring plate, and the other end is connected to the fifth ring plate, and the bottom end of the fourth ring plate is connected to the seventh ring plate, and a cavity is surrounded by the second ring plate, the sixth ring plate, the seventh ring plate and the fourth ring plate, and the third ring plate divides the cavity into two left and right chambers, wherein One chamber is surrounded by the second ring plate, the third ring plate, and the sixth ring plate, and the other chamber is surrounded by the third ring plate, the seventh ring plate and the fourth ring plate; an oblique conical ring plate is connected between the first ring plate and the third ring plate, the end of the second ring plate is connected to the conical ring plate, and the first ring plate, the second ring plate and the conical ring plate form a third equalizing pressure chamber; a tenth ring plate is arranged between the fourth ring plate and the fifth ring plate, one end of the tenth ring plate is connected to the fourth ring plate, and the other end is connected to the fifth ring plate, and the tenth ring plate is located above the seventh ring plate; the first equalizing pressure chamber and the second equalizing pressure chamber through which cooling air passes are surrounded by the fourth ring plate, the fifth ring plate, the seventh ring plate and the tenth ring plate.

[0009] Furthermore, first ventilation holes are arranged at circumferential intervals on the fourth ring plate of the second pressure equalizing chamber so that the air inlet chamber is connected with the second pressure equalizing chamber; second ventilation holes are arranged at circumferential intervals on the sixth ring plate, and the second ventilation holes are only distributed on the sixth ring plate corresponding to the first air outlet chamber, for connecting with the first space; third ventilation holes are arranged at circumferential intervals on the seventh ring plate, and the third ventilation holes are only distributed on the seventh ring plate corresponding to the second air outlet chamber, for connecting with the second space; the second ventilation holes and the third ventilation holes have the same position on the circumference. Furthermore, the sixth ring plate is located above the conical ring plate, the third ring plate, the sixth ring plate and the conical ring plate form a first space, the eighth ring plate is arranged below the seventh ring plate, one end of the eighth ring plate is connected to the third ring plate, and the other end is connected to the fifth ring plate; the third ring plate, the fifth ring plate, the seventh ring plate and the eighth ring plate form a second space; the third ring plate located in the first space and the second space is provided with a fourth ventilation hole along the circumference for connecting the first space to the second space; the ninth ring plate is arranged below the eighth ring plate, one end of the ninth ring plate is connected to the third ring plate, and the other end is connected to the fifth ring plate, and the third ring plate, the fifth ring plate, the eighth ring plate and the ninth ring plate form a third space.

[0010] Furthermore, the stator core is arranged in the rotor cylinder, the rotor magnet is arranged between the rotor cylinder and the stator core, the ventilation slot steel is arranged between two adjacent sections of the stator core, the two sections of the stator core and the ventilation slot steel form a radially separated radial ventilation duct, the tensioning screw passes through the multiple sections of the stator core, and both ends of the tensioning screw are fixed with stator end pressure plates; an air gap is arranged between the rotor magnet and the stator core.

[0011] Furthermore, the rotor cylinder is connected to the rotor non-driving end ring plate, the rotor non-driving end ring plate is equipped with a sealing structure M, an eleventh ring plate is arranged between the rotor non-driving end ring plate and the fifth ring plate, one end of the eleventh ring plate is connected to the fifth ring plate, and the other end is connected to the rotor non-driving end ring plate, the eleventh ring plate and the fifth ring plate, the stator end pressure plate, the rotor non-driving end ring plate, and the rotor cylinder form a fourth space; the rotor non-driving end ring plate is connected to one end of the twelfth ring plate; a thirteenth ring plate is arranged below the eleventh ring plate, one end of the thirteenth ring plate is connected to the fifth ring plate, and the other end is connected to the other end of the twelfth ring plate The fifth space is surrounded by the rotor non-driving end ring plate, the eleventh ring plate, the twelfth ring plate, the thirteenth ring plate and the fifth ring plate; the fifth ventilation holes are evenly arranged on the circumference of the eleventh ring plate for connecting the fourth space with the fifth space; the first ring plate, the conical ring plate, the third ring plate and the rotor cylinder surround the sixth space, the third ring plate located between the sixth space and the third space is provided with sixth ventilation holes for connecting the sixth space with the third space, and the fifth ring plate located between the second space, the third space and the fifth space is provided with seventh ventilation holes along the circumference, so that the second space and the third space are both connected to the fifth space.

[0012] Furthermore, the fifth ring plate and the twelfth ring plate have correspondingly multiple eighth ventilation holes on the circumference for multiple first ventilation ducts to pass through, one end of the first ventilation duct is located in the first pressure equalizing chamber, and the other end is located outside the fifth space; the second ring plate, the third ring plate, the fourth ring plate, the fifth ring plate, and the twelfth ring plate have correspondingly multiple ninth ventilation holes on the circumference for multiple second ventilation ducts to pass through, one end of the second ventilation duct is located in the third pressure equalizing chamber, and the other end is located outside the fifth space; the fifth ring plate and the twelfth ring plate have correspondingly multiple tenth ventilation holes on the circumference for multiple third ventilation ducts to pass through, one end of the third ventilation duct is located in the second pressure equalizing chamber, and the other end is located outside the fifth space; and multiple air outlet ducts are installed along the circumference on the twelfth ring plate.

[0013] Furthermore, the first ventilation duct, the second ventilation duct and the third ventilation duct are combined to form a set of air inlet ducts, the air inlet ducts and the air outlet ducts are evenly distributed along the circumference, the number is 6-8, and a blower is installed at the air inlet duct.

[0014] Furthermore, the radial dimensions of the air inlet cavity, the first air outlet cavity, and the second air outlet cavity are not less than 100 mm.

[0015] Furthermore, the radial dimension of the first pressure equalizing chamber is not less than 150 mm; the radial dimension of the second pressure equalizing chamber is not less than 100 mm, and the radial dimension of the third pressure equalizing chamber is not less than 200 mm.

[0016] Furthermore, the air gap value is 4-5 mm.

[0017] Furthermore, the axial height of the radial ventilation duct is 3-4 mm.

[0018] Furthermore, the total axial length of the stator core is more than 1500 mm, and the axial length of each section of the stator core is 20-30 mm and is evenly distributed in the axial direction.

[0019] Furthermore, the sealing structure M includes a rotor non-driving end ring plate, a sealing mounting ring plate, a pressure block, a C-type seal, and a sealing ring plate. The rotor non-driving end ring plate is installed with a sealing mounting ring plate, a pressure block, a C-type seal, and a sealing ring plate; grooves for installing C-type seals are processed on both end surfaces on the inner diameter side of the rotor non-driving end ring plate, and the C-type seal is fixed with the help of a pressure block. The C-type seal lips are all facing the inner diameter side, and are squeezed and matched with the sealing ring plate installed on the sealing mounting ring plate to complete the sealing of the dynamic and static separation of the motor.

[0020] Furthermore, the number of the fourth ventilation holes is consistent with that of the second ventilation holes or the third ventilation holes, and the positions of the fourth ventilation holes on the circumference are the same as those of the second ventilation holes and the third ventilation holes.

[0021] The beneficial effects of the present invention are as follows: 1. By adopting radial ventilation cooling in the straight section near the end of the stator and the end of the stator, and adopting tangential air gap flow cooling in the middle of the stator, the gradient distribution of the stator temperature along the axial direction is improved and the stator temperature difference is reduced.

[0022] 2. In the present invention, after the cooling air enters the first equalizing pressure chamber from the first ventilation duct, it spreads out on the circumference, flows to the radial ventilation duct distributed on the circumference of the stator core corresponding to the first equalizing pressure chamber to the air gap, and then enters the fourth space to cool the non-driving end of the stator coil. On the one hand, the cooling air cools the straight section of the stator close to the non-driving end; on the other hand, the cooling air has a short distance to the non-driving end of the stator coil, which can fully cool the non-driving end of the stator coil, thereby improving the efficiency of the cooling air.

[0023] 3. After the second cooling air of the present invention enters the third pressure-equalizing chamber from the second ventilation duct, it is also dispersed in the circumferential direction, flows to the radial ventilation duct distributed on the circumference of the stator core corresponding to the third pressure-equalizing chamber to the air gap, and then enters the sixth space to cool the driving end of the stator coil. Since the second ventilation duct passes through the air inlet chamber, it has the effect of cooling the air in the air inlet chamber, and coupled with the isolation of the second ventilation duct, the cooling air in the second ventilation duct is less affected by the heat dissipated by the stator core during the journey to the third pressure-equalizing chamber, so it can ensure sufficient cooling of the stator straight section close to the driving end, and it can also ensure sufficient cooling of the driving end of the stator coil, thereby improving the efficiency of the cooling air.

[0024] 4. In the first aspect of the present invention, the radial dimensions of the air inlet cavity and the first air outlet cavity and the second air outlet cavity are large, which can reduce wind resistance and ensure that there is sufficient cooling air in the air inlet cavity to cool the stator core. After the cooling air exchanges heat with the stator core, it can ensure that the hot air flows out of the first air outlet cavity and the second air outlet cavity smoothly; in the second aspect, the radial dimension of the air inlet cavity is large, the wind resistance is reduced, and the cooling air entering is sufficient. The cooling air flows from the corresponding air inlet cavity to the radial ventilation duct and the air gap, and flows to the air outlet cavity through the radial ventilation duct, so that the contact area between the cooling air and the stator core in the middle part of the stator is large enough, and the heat exchange effect is high, so that each section of the stator core and the stator coil at each section of the stator core can obtain more sufficient cooling air, thereby improving the cooling effect and significantly reducing the axial temperature difference.

[0025] 5. In the present invention, each section of the stator core is 20% shorter than the conventional large-capacity permanent magnet low-speed wind turbine stator core. Since the stator core and the coil are radially ventilated and cooled, the shorter the radial ventilation duct spacing is, the greater the heat dissipation area of ​​the stator core and the stator coil can be increased, thereby improving the cooling effect.

[0026] 6. In the present invention, the axial height of the radial ventilation duct is 3-4 mm, which is more than 10% smaller than that of the prior art. The reduction in the height of the radial ventilation duct can increase the number of radial ventilation ducts without significantly increasing the total length of the core as much as possible, thereby increasing the heat dissipation surface area and improving the cooling effect.

[0027] 7. In the present invention, the first ventilation duct, the second ventilation duct and the third ventilation duct are combined to form a set of air inlet ducts. The air inlet ducts and the air outlet ducts are evenly distributed along the circumference, with a number of 6-8. A blower is installed at the air inlet duct, which is conducive to more uniform flow of cooling air on the circumference, helps to reduce the circumferential wind temperature difference, and ensures the ventilation and cooling effect.

[0028] In summary, the cooling air path of the present invention improves the cooling effect and reduces the stator temperature difference. Compared with the prior art, the wind resistance is reduced by more than 30%, the axial temperature difference is reduced by more than 20%, and the circumferential temperature difference is reduced by 20 to 25%, thereby improving the utilization rate of cooling air, thereby enabling the wind turbine to adapt to the unfavorable conditions of lower air density in high altitude areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Longitudinal section of wind turbine generator; Figure 2 Non-drive end view of wind turbine generator; Figure 3 AA cross-section of wind turbine generator; Figure 4 Cross-section of wind turbine motor BB; Figure 5 Cross-section of wind turbine generator CC; Figure 6 Wind turbine generator DD cross-section diagram; Figure 7 Cavity expansion diagram; Figure 8 Partial view of sealing structure M; Figure numerals: 1-rotor cylinder, 2-rotor magnetic steel, 3-rotor non-driving end ring plate, 4-fifth space, 5-eleventh ring plate, 6-sealing mounting ring plate, 7-stator coil, 8-stator core, 9-first ring plate, 10-third ring plate, 11-fifth ring plate, 12-rib plate, 13-second ring plate, 14-sixth ring plate, 15-fourth ring plate, 16-seventh ring plate, 17-conical ring plate, 18-eighth ring plate, 19-ninth ring plate, 20-tenth ring plate, 21-first ventilation duct, 22-second ventilation duct, 23-third ventilation duct, 24-first equalizing pressure chamber, 25-second equalizing pressure chamber, 26-third equalizing pressure chamber, 27 -air inlet chamber, 28-first air outlet chamber, 29-first space, 30-second space, 31-third space, 32-fourth space, 33-sixth space, 34-air outlet duct, 35-twelfth ring plate, 36-thirteenth ring plate, 37-first ventilation hole, 38-fourth ventilation hole, 39-seventh ventilation hole, 40-sixth ventilation hole, 41-air gap, 42-radial ventilation duct, 43-ventilation channel steel, 44-stator end pressure plate, 45-tensioning screw, 46-second ventilation hole, 47-third ventilation hole, 48-sealing ring plate, 49-blower, 50-pressing block, 51-C-type seal, 52-second air outlet chamber, 53-fifth ventilation hole. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Solid and dotted arrows are used in the drawings to distinguish between cold air and hot air flow, and ⊕ and ⊙ are used in the cross-sectional diagram to indicate the vertical cross-sectional inflow and vertical cross-sectional outflow directions of the airflow. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1 A method for cooling the stator of a high-altitude long-core wind turbine motor by partitioning, after the cooling air enters the first pressure equalizing chamber 24 from the first ventilation duct 21, it is dispersed in the circumferential direction, flows to the radial ventilation duct 42 distributed on the circumference of the stator core 8 corresponding to the first pressure equalizing chamber 24 to the air gap 41, and then enters the fourth space 32 to cool the non-driving end of the stator coil 7, and at the same time, the cooling air flows from the fourth space 32 to the fifth space 4; After the cooling air enters the third pressure-equalizing chamber 26 from the second ventilation duct 22, it is also dispersed in the circumferential direction, flows to the radial ventilation duct 42 distributed on the circumference of the stator core 8 of the third pressure-equalizing chamber 26 to the air gap 41, and then enters the sixth space 33 to cool the driving end of the stator coil 7. At the same time, the cooling air enters the third space 31 from the sixth space 33, and then flows to the fifth space 4; After the cooling air enters the second equalizing pressure chamber 25 from the third ventilation duct 23, it disperses in the circumferential direction and enters the air inlet chamber 27, flows to the radial ventilation ducts 42 distributed on the circumference of the stator core 8 corresponding to the air inlet chamber 27 to the air gap 41, flows to the radial ventilation ducts 42 distributed on the circumference corresponding to the first air outlet chamber 28 and the second air outlet chamber 52 through the air gap 41, enters the first air outlet chamber 28 and the second air outlet chamber 52, the cooling air in the first air outlet chamber 28 enters the first space 29, the second space 30, and enters the fifth space 4, the cooling air in the second air outlet chamber 52 flows to the second space 30 and the fifth space 4; at this point, the three winds converge into the fifth space 4 and are discharged through the air outlet duct 34 installed on the fifth space 4.

[0032] A cavity is formed between the stator core 8 and the stator base, and a third ring plate 10 is installed on the stator base. The third ring plate 10 divides the cavity into two left and right chambers; a plurality of axial ribs 12 are arranged at intervals in the chamber, and the axial ribs 12 divide the chamber into a plurality of axial cavities, and the axial cavities are evenly distributed along the circumference of the stator base. A portion of the plurality of axial cavities is an air inlet chamber 27, and a portion is an air outlet chamber. The air inlet chamber 27 and the air outlet chamber are adjacently arranged and evenly distributed along the circumference; the third ring plate 10 of the air inlet chamber 27 is arranged at intervals in the chamber, and ... The ring plate 10 is provided with ventilation holes, forming the air inlet cavity 27 into an axially longer air inlet cavity 27; the air outlet cavity is divided into a first air outlet cavity 28 and a second air outlet cavity 52 by the third ring plate 10; a fourth space 32 is provided at the non-driving end of the stator coil 7, a fifth space 4 is provided below the fourth space 32 and communicated with the fourth space 32; a first pressure equalizing cavity 24 and a second pressure equalizing cavity 25 are provided between the fifth space 4 and the axial cavity, and the second pressure equalizing cavity 25 is communicated with the air inlet cavity 27, A third equalizing pressure chamber 26 is arranged adjacent to the driving end of the axial cavity near the stator coil 7, and the first ventilation duct 21, the second ventilation duct 22 and the third ventilation duct 23 are installed in the fifth space 4; the air outlet of the first ventilation duct 21 is placed in the first equalizing pressure chamber 24 and is connected to the first equalizing pressure chamber 24; the air outlet of the second ventilation duct 22 passes through the air inlet chamber 27 and is placed in the third equalizing pressure chamber 26 and is connected to the third equalizing pressure chamber 26; the air outlet of the third ventilation duct 23 is placed in the second equalizing pressure chamber 25 and is connected to the second equalizing pressure chamber 25; a first space 29 and a second space 30 are arranged below the cavity body, the first air outlet chamber 28 is connected to the first space 29, the second air outlet chamber 52 is connected to the second space 30, the first space 29 is connected to the second space 30, and the second space 30 is connected to the fifth space 4; the sixth space 33 and the third space 31 are installed below the first space 29 and the second space 30, the sixth space 33 is connected to the third space 31, and the third space 31 is connected to the fifth space 4.

[0033] When implementing, Figure 1As shown, the cooling air is divided into three paths. One path of cooling air enters the first pressure equalizing chamber 24 from the first ventilation duct 21, spreads out on the circumference, flows to the radial ventilation duct 42 distributed on the circumference of the stator core 8 corresponding to the first pressure equalizing chamber 24 to the air gap 41, and then enters the fourth space 32 to cool the non-driving end of the stator coil 7. On the one hand, the cooling air cools the stator straight section close to the non-driving end; on the other hand, the cooling air has a short distance to the non-driving end of the stator coil 7, so the cooling air can contact the non-driving end of the stator coil 7 faster, fully cool the non-driving end of the stator coil 7, and improve the efficiency of the cooling air.

[0034] After the second cooling air enters the third pressure equalizing chamber 26 from the second ventilation duct 22, it is also dispersed in the circumferential direction, flows to the radial ventilation duct 42 distributed on the circumference of the stator core 8 corresponding to the third pressure equalizing chamber 26 to the air gap 41, and then enters the sixth space 33 to cool the driving end of the stator coil 7. Since the second ventilation duct 22 passes through the air inlet chamber 27, it has the effect of cooling the air in the air inlet chamber 27, and coupled with the isolation of the second ventilation duct 22, the cooling air in the second ventilation duct 22 is less affected by the heat dissipated by the stator core 8 during the journey to the third pressure equalizing chamber, so that it can ensure sufficient cooling of the stator straight section close to the driving end, and also ensure sufficient cooling of the driving end of the stator coil, thereby improving the efficiency of the cooling air.

[0035] After the third cooling air enters the second equalizing pressure chamber 25 from the third ventilation duct 23, it disperses in the circumferential direction and enters the air inlet chamber 27, flows to the radial ventilation duct 42 distributed on the circumference of the stator core 8 corresponding to the air inlet chamber 27 to the air gap 41, flows to the radial ventilation duct 42 distributed on the circumference of the first air outlet chamber 28 and the second air outlet chamber 52 through the air gap 41, and enters the first air outlet chamber 28 and the second air outlet chamber 52; on the first aspect, the radial dimensions of the air inlet chamber 27 and the first air outlet chamber 28 and the second air outlet chamber 52 are large, which can reduce wind resistance and ensure that there is sufficient cooling air in the air inlet chamber 27 to cool the stator core 8. After the cooling air exchanges heat with the stator core 8, it can ensure that the hot air flows out of the first air outlet chamber 28 and the second air outlet chamber 52 smoothly; on the second aspect, the radial dimension of the air inlet chamber 27 is large, the wind resistance is reduced, and the cooling air entering is sufficient, and the cooling air is cooled from the corresponding inlet chamber 27. The wind cavity 27 flows to the radial ventilation duct 42 and the air gap 41, and flows to the corresponding air outlet cavity through the radial ventilation duct, so that the contact area between the cooling air and the stator core in the middle part of the stator is large enough, the contact time is long, the heat exchange time is long, the heat exchange efficiency is high, and the axial temperature difference cooling effect is significant; thirdly, when the cooling air flows from one end of the air inlet cavity 27 to the other end of the air inlet cavity 27, it will be affected by the heat dissipated by the stator core 8 and the stator coil 7, which will cause the temperature of the cooling air to partially increase, but because the cooling air entering the air inlet cavity 27 is sufficient, the difference in air volume in the radial ventilation duct 42 is reduced, so that the contact time between the cooling air and the stator core 8 is long, the heat exchange time is long, and the heat exchange effect is high, so that each section of the stator core 8 and the stator coil 7 at each section of the stator core 8 can obtain more sufficient cooling air, thereby improving the cooling effect and achieving a significant cooling effect.

[0036] The present invention cools the stator core 8 and is particularly suitable for high-altitude, large-capacity, permanent magnet, low-speed wind turbines, where cooling is more difficult due to low air density.

[0037] Even if the air outlet duct in the prior art with the authorization announcement number CN110429747B and the authorization announcement date of November 20, 2020, and the name of a method for reducing the circumferential temperature difference between a motor coil and an iron core, is used as the air inlet, the air enters from the air outlet duct, the cooling air enters the air outlet cavity, flows to the stator ventilation groove corresponding to the air outlet cavity, and is released from the stator after being discharged from the air gap 41. In this process, due to the small radial size of the air outlet cavity and the large wind resistance, less cooling air enters the air outlet cavity, which will result in a short direct contact time between the stator core 8 and the stator core 8, and heat exchange can be performed. The time is short and the heat exchange efficiency is low; when the cooling air flows from one end of the air outlet cavity to the other end of the air outlet cavity, the temperature of the cooling air gradually increases due to the heat dissipated by the stator core 8 and the stator coil 7, and the cooling air with a higher temperature flows to the stator ventilation groove, resulting in uneven cooling of each section of the stator core 8 and low cooling efficiency; the cooling air flows from the stator ventilation groove to the air gap 41, flows from the air gap 41 to the two ends of the stator, and is released from the stator. Since the cooling air has exchanged heat with the stator core 8, it flows from the air gap 41 to the two ends of the stator for cooling, and the cooling effect is low. Compared with the present invention, the existing technology is difficult to achieve the cooling effect of the present invention.

[0038] Example 2 This embodiment further elaborates and supplements the implementation mode of the present invention on the basis of Embodiment 1.

[0039] like Figure 1-Figure 7As shown, the stator frame includes a first ring plate 9, a second ring plate 13, a third ring plate 10, a fourth ring plate 15 and a fifth ring plate 11 and a plurality of axial rib plates 12 which are sequentially arranged on the inner diameter side back of the stator core 8, a sixth ring plate 14 is arranged between the second ring plate 13 and the third ring plate 10, one end of the sixth ring plate 14 is connected to the second ring plate 13, and the other end is connected to the third ring plate 10; a seventh ring plate 16 is arranged between the third ring plate 10 and the fifth ring plate 11, one end of the seventh ring plate 16 is connected to the third ring plate 10, and the other end is connected to the fifth ring plate 11, and the bottom end of the fourth ring plate 15 is connected to the seventh ring plate 16, and a cavity is surrounded by the second ring plate 13, the sixth ring plate 14, the seventh ring plate 16 and the fourth ring plate 15, and the third ring plate 10 divides the cavity into two left and right chambers, one of which is A chamber is surrounded by the second ring plate 13, the third ring plate 10, and the sixth ring plate 14, and another chamber is surrounded by the third ring plate 10, the seventh ring plate 16 and the fourth ring plate 15; an oblique conical ring plate 17 is connected between the first ring plate 9 and the third ring plate 10, and the end of the second ring plate 13 is connected to the conical ring plate 17, and the first ring plate 9, the second ring plate 13 and the conical ring plate 17 surround a third equalizing pressure chamber 26; a tenth ring plate 20 is arranged between the fourth ring plate 15 and the fifth ring plate 11, one end of the tenth ring plate 20 is connected to the fourth ring plate 15, and the other end is connected to the fifth ring plate 11, and the tenth ring plate 20 is located above the seventh ring plate 16; the fourth ring plate 15, the fifth ring plate 11, the seventh ring plate 16, and the tenth ring plate 20 surround the first equalizing pressure chamber 24 and the second equalizing pressure chamber 25 through which cooling air passes.

[0040] The first ventilation holes 37 are arranged at circumferential intervals on the fourth ring plate 15 constituting the second equalizing pressure chamber 25 so that the air inlet chamber 27 is connected to the second equalizing pressure chamber 25; the second ventilation holes 46 are arranged at circumferential intervals on the sixth ring plate 14, and the second ventilation holes 46 are only distributed on the sixth ring plate 14 corresponding to the first air outlet chamber 28, for connecting to the first space 29; the third ventilation holes 47 are arranged at circumferential intervals on the seventh ring plate 16, and the third ventilation holes 47 are only distributed on the seventh ring plate 16 corresponding to the second air outlet chamber 52, for connecting to the second space 30; the second ventilation holes 46 and the third ventilation holes 47 are at the same position on the circumference.

[0041] The sixth ring plate 14 is located above the conical ring plate 17, and the third ring plate 10, the sixth ring plate 14 and the conical ring plate 17 enclose a first space 29. An eighth ring plate 18 is arranged below the seventh ring plate 16, and one end of the eighth ring plate 18 is connected to the third ring plate 10, and the other end is connected to the fifth ring plate 11; the third ring plate 10, the fifth ring plate 11, the seventh ring plate 16 and the eighth ring plate 18 enclose a second space 30; fourth ventilation holes 38 are circumferentially arranged on the third ring plate 10 located in the first space 29 and the second space 30 for connecting the first space 29 to the second space 30; a ninth ring plate 19 is arranged below the eighth ring plate 18, and one end of the ninth ring plate 19 is connected to the third ring plate 10, and the other end is connected to the fifth ring plate 11, and the third ring plate 10, the fifth ring plate 11, the eighth ring plate 18 and the ninth ring plate 19 enclose a third space 31.

[0042] Example 3 This embodiment further elaborates and supplements the implementation mode of the present invention on the basis of Embodiment 1 or Embodiment 2.

[0043] The stator core 8 is arranged in the rotor cylinder 1, the rotor magnetic steel 2 is arranged between the rotor cylinder 1 and the stator core 8, the ventilation slot steel 43 is arranged between two adjacent sections of the stator core 8, the two sections of the stator core 8 and the ventilation slot steel 43 form a radially separated radial ventilation duct 42, the tensioning screw 45 passes through the multiple sections of the stator core 8, and both ends of the tensioning screw 45 are fixed by the stator end pressure plate 44; an air gap 41 is arranged between the rotor magnetic steel 2 and the stator core 8.

[0044] The rotor cylinder 1 is connected to the rotor non-driving end ring plate 3, the rotor non-driving end ring plate 3 is equipped with a sealing structure M, an eleventh ring plate 5 is arranged between the rotor non-driving end ring plate 3 and the fifth ring plate 11, one end of the eleventh ring plate 5 is connected to the fifth ring plate 11, and the other end is connected to the rotor non-driving end ring plate 3, the eleventh ring plate 5 and the fifth ring plate 11, the stator end pressure plate 44, the rotor non-driving end ring plate 3, and the rotor cylinder 1 form a fourth space 32; the rotor non-driving end ring plate 3 is connected to one end of the twelfth ring plate 35; a thirteenth ring plate 36 is arranged below the eleventh ring plate 5, one end of the thirteenth ring plate 36 is connected to the fifth ring plate 11, and the other end is connected to the other end of the twelfth ring plate 35, and the rotor non-driving end ring plate 3 The eleventh ring plate 5, the twelfth ring plate 35, the thirteenth ring plate 36 and the fifth ring plate 11 form a fifth space 4; fifth ventilation holes 53 are evenly arranged along the circumference of the eleventh ring plate 5 for the fourth space 32 to connect with the fifth space 4; the first ring plate 9, the conical ring plate 17, the third ring plate 10 and the rotor cylinder 1 form a sixth space 33, and the third ring plate 10 located in the sixth space 33 and the third space 31 is provided with sixth ventilation holes 40 for the sixth space 33 to connect with the third space 31; the fifth ring plate 11 located in the second space 30, the third space 31 and the fifth space 4 is provided with seventh ventilation holes 39 along the circumference, so that the second space 30 and the third space 31 are both connected to the fifth space 4.

[0045] The fifth ring plate 11 and the twelfth ring plate 35 are provided with a plurality of eighth ventilation holes on the circumference correspondingly for the passage of the plurality of first ventilation ducts 21, one end of the first ventilation duct 21 is located in the first pressure equalizing chamber 24, and the other end is located outside the fifth space 4; the second ring plate 13, the third ring plate 10, the fourth ring plate 15, the fifth ring plate 11, and the twelfth ring plate 35 are provided with a plurality of ninth ventilation holes on the circumference correspondingly for the passage of the plurality of second ventilation ducts 22, one end of the second ventilation duct 22 is located in the third pressure equalizing chamber 26, and the other end is located outside the fifth space 4; the fifth ring plate 11 and the twelfth ring plate 35 are provided with a plurality of tenth ventilation holes on the circumference correspondingly for the passage of the plurality of third ventilation ducts 23, one end of the third ventilation duct 23 is located in the second pressure equalizing chamber 25, and the other end is located outside the fifth space 4; a plurality of air outlet ducts 34 are installed along the circumference of the twelfth ring plate 35.

[0046] Example 4 This embodiment further elaborates and supplements the implementation manner of the present invention on the basis of Embodiment 1, Embodiment 2 or Embodiment 3.

[0047] The first ventilation duct 21, the second ventilation duct 22 and the third ventilation duct 23 are combined to form a set of air inlet ducts. The air inlet ducts and the air outlet ducts 34 are evenly distributed along the circumference, with a number of 6-8. A blower 49 is installed at the air inlet duct, which is conducive to more uniform flow of cooling air on the circumference, ensuring the ventilation and cooling effect, and reducing the circumferential wind temperature difference to ensure the ventilation and cooling effect.

[0048] The radial dimensions of the air inlet chamber 27, the first air outlet chamber 28, and the second air outlet chamber 52 are not less than 100 mm. On the one hand, the radial dimensions of the air inlet chamber 27, the first air outlet chamber 28, and the second air outlet chamber 52 are large, which can reduce wind resistance and ensure that there is sufficient cooling air in the air inlet chamber 27 to cool the stator core 8. After the cooling air exchanges heat with the stator core 8, it can ensure that the hot air flows smoothly out of the first air outlet chamber 28 and the second air outlet chamber 52. On the other hand, the radial dimensions of the air inlet chamber 27 are large, the wind resistance is reduced, and the cooling air entering is sufficient. The cooling air flows from the corresponding air inlet chamber 27 to the radial ventilation duct 42 and the air gap 41, and then flows to the corresponding air outlet chamber through the radial ventilation duct, so that the contact area between the cooling air and the stator core in the middle part of the stator is large enough, and the contact time is short. The heat exchange time is long, the heat exchange efficiency is high, and the axial temperature difference cooling effect is significant; thirdly, when the cooling air flows from one end of the air inlet cavity 27 to the other end of the air inlet cavity 27, it will be affected by the heat dissipated by the stator core 8 and the stator coil 7, which will cause the temperature of the cooling air to partially increase. However, since the cooling air entering the air inlet cavity 27 is sufficient, the difference in air volume in the radial ventilation duct 42 is reduced, so that the contact time between the cooling air and the stator core 8 is long, the heat exchange time is long, and the heat exchange effect is high, so that each section of the stator core 8 and the stator coil 7 at each section of the stator core 8 can obtain more sufficient cooling air, thereby improving the cooling effect and achieving significant cooling effect.

[0049] The radial dimension of the first pressure equalizing chamber 24 is not less than 150 mm; the radial dimension of the second pressure equalizing chamber 25 is not less than 100 mm, and the radial dimension of the third pressure equalizing chamber 26 is not less than 200 mm.

[0050] The value of the air gap 41 is 4-5 mm, which ensures that the cooling air has sufficient flow space.

[0051] The axial height of the radial ventilation channel 42 is 3-4 mm. The axial height of the radial ventilation channel 42 is 3-4 mm, which is more than 10% smaller than that of the prior art. The reduction in the height of the radial ventilation channel 42 can increase the number of radial ventilation channels 42 without significantly increasing the total length of the core as much as possible, thereby increasing the heat dissipation surface area and improving the cooling effect.

[0052] The total axial length of the stator core 8 is more than 1500 mm, and the axial length of each section of the stator core 8 is 20-30 mm, and is evenly distributed in the axial direction. Compared with the prior art, each section of the stator core 8 in the present invention is 20% shorter than the conventional large-capacity permanent magnet low-speed wind power motor stator core 8. Since the stator core 8 and the stator coil 7 are radially ventilated and cooled, the shorter the spacing of the radial ventilation duct 42, the greater the heat dissipation area of ​​the stator core 8 and the stator coil 7 can be increased, thereby improving the cooling effect.

[0053] The sealing structure M includes a rotor non-driving end ring plate 3, a sealing mounting ring plate 6, a pressure block 50, a C-type seal 51, and a sealing ring plate 48. The sealing mounting ring plate 6, the pressure block 50, the C-type seal 51, and the sealing ring plate 48 are installed on the rotor non-driving end ring plate 3; grooves for installing the C-type seal 51 are processed on both end surfaces on the inner diameter side of the rotor non-driving end ring plate 3, and the C-type seal 51 is fixed with the help of the pressure block 50. The lips of the C-type seal 51 are all facing the inner diameter side, and are squeezed and matched with the sealing ring plate 48 installed on the sealing mounting ring plate 6 to complete the sealing of the dynamic and static separation of the motor.

[0054] The number of the fourth ventilation holes 38 is the same as that of the second ventilation holes 46 or the third ventilation holes 47 , and the positions of the fourth ventilation holes 38 on the circumference are the same as those of the second ventilation holes 46 and the third ventilation holes 47 .

Claims

1. A method for cooling the stator of a high-altitude long-core wind turbine generator by zoning, characterized in that: After the cooling air enters the first pressure equalizing chamber (24) from the first ventilation duct (21), it is dispersed in the circumferential direction and flows to the radial ventilation duct (42) distributed on the circumference of the stator core (8) corresponding to the first pressure equalizing chamber (24) to the air gap (41), and then enters the fourth space (32) to cool the non-driving end of the stator coil (7). At the same time, the cooling air flows from the fourth space (32) to the fifth space (4); After the cooling air enters the third pressure equalizing chamber (26) from the second ventilation duct (22), it is also dispersed in the circumferential direction, flows to the radial ventilation duct (42) distributed on the circumference of the stator core (8) corresponding to the third pressure equalizing chamber (26) to the air gap (41), and then enters the sixth space (33) to cool the driving end of the stator coil (7). At the same time, the cooling air enters the third space (31) from the sixth space (33), and then flows to the fifth space (4); After the cooling air enters the second pressure equalizing chamber (25) from the third ventilation duct (23), it disperses in the circumferential direction and enters the air inlet chamber (27), flows to the radial ventilation passages (42) distributed on the circumference of the stator core (8) corresponding to the air inlet chamber (27) to the air gap (41), flows through the air gap (41) to the radial ventilation passages (42) distributed on the circumference corresponding to the first air outlet chamber (28) and the second air outlet chamber (52), enters the first air outlet chamber (28) and the second air outlet chamber (52), the cooling air in the first air outlet chamber (28) enters the first space (29), the second space (30), and enters the fifth space (4), the cooling air in the second air outlet chamber (52) flows to the second space (30), the fifth space (4) ; At this point, the three winds converge into the fifth space (4) and are discharged through the air outlet duct (34) installed on the fifth space (4); a cavity is formed between the stator core (8) and the stator base, and a third ring plate (10) is installed on the stator base, and the third ring plate (10) divides the cavity into two left and right chambers; a plurality of axial ribs (12) are arranged at intervals in the cavity, and the axial ribs (12) divide the cavity into a plurality of axial cavities, and the axial cavities are evenly distributed along the circumference of the stator base. A portion of the plurality of axial cavities is an air inlet cavity (27), and a portion is an air outlet cavity. The air inlet cavity (27) and the air outlet cavity are adjacently arranged and evenly distributed along the circumference; a ventilation channel is opened on the third ring plate (10) of the air inlet cavity (27), and the air inlet cavity (27) is connected to the air outlet cavity. 7) is formed into an air inlet cavity (27) which is longer in the axial direction; the air outlet cavity is divided into a first air outlet cavity (28) and a second air outlet cavity (52) by a third ring plate (10); a fourth space (32) is provided at the non-driving end of the stator coil (7); a fifth space (4) is provided below the fourth space (32) and is communicated with the fourth space (32); a first pressure equalizing cavity (24) and a second pressure equalizing cavity (25) are provided between the fifth space (4) and the axial cavity; the second pressure equalizing cavity (25) is communicated with the air inlet cavity (27); a third pressure equalizing cavity (26) is provided adjacent to the driving end of the axial cavity close to the stator coil (7); a first ventilation duct (21), a second ventilation duct (22) and a third ventilation duct are installed in the fifth space (4); duct (23); the air outlet of the first ventilation duct (21) is disposed in the first pressure equalizing chamber (24) and communicated with the first pressure equalizing chamber (24); the air outlet of the second ventilation duct (22) passes through the air inlet chamber (27) and is disposed in the third pressure equalizing chamber (26) and communicated with the third pressure equalizing chamber (26); the air outlet of the third ventilation duct (23) is disposed in the second pressure equalizing chamber (25) and communicated with the second pressure equalizing chamber (25); a first space (29) and a second space (30) are provided below the cavity body; the first air outlet chamber (28) is communicated with the first space (29), the second air outlet chamber (52) is communicated with the second space (30), the first space (29) is communicated with the second space (30), and the second space (30) is communicated with the fifth space (4);A sixth space (33) and a third space (31) are installed below the first space (29) and the second space (30); the sixth space (33) is connected to the third space (31), and the third space (31) is connected to the fifth space (4). ; 2. A method for cooling the stator of a high-altitude long-core wind turbine according to claim 1, characterized in that: The stator frame comprises a first ring plate (9), a second ring plate (13), a third ring plate (10), a fourth ring plate (15) and a fifth ring plate (11) and a plurality of axial rib plates (12) which are sequentially arranged on the inner diameter side back of the stator core (8); a sixth ring plate (14) is arranged between the second ring plate (13) and the third ring plate (10); one end of the sixth ring plate (14) is connected to the second ring plate (13) and the other end is connected to the third ring plate (10); the third ring plate (10 ) and the fifth ring plate (11), one end of the seventh ring plate (16) is connected to the third ring plate (10), and the other end is connected to the fifth ring plate (11); the bottom end of the fourth ring plate (15) is connected to the seventh ring plate (16); a cavity is surrounded by the second ring plate (13), the sixth ring plate (14), the seventh ring plate (16) and the fourth ring plate (15); the third ring plate (10) divides the cavity into two left and right chambers, one of which is formed by the second ring plate (13), the sixth ring plate (14), the seventh ring plate (16) and the fourth ring plate (15); The ring plate (13), the third ring plate (10), and the sixth ring plate (14) are used to form a chamber, and another chamber is formed by the third ring plate (10), the seventh ring plate (16), and the fourth ring plate (15); an oblique conical ring plate (17) is connected between the first ring plate (9) and the third ring plate (10), and the end of the second ring plate (13) is connected to the conical ring plate (17); the first ring plate (9), the second ring plate (13), and the conical ring plate (17) form a third pressure equalizing chamber (26) A tenth ring plate (20) is arranged between the fourth ring plate (15) and the fifth ring plate (11), one end of the tenth ring plate (20) is connected to the fourth ring plate (15), and the other end is connected to the fifth ring plate (11), and the tenth ring plate (20) is located above the seventh ring plate (16), and the fourth ring plate (15), the fifth ring plate (11), the seventh ring plate (16), and the tenth ring plate (20) form a first equalizing pressure cavity (24) and a second equalizing pressure cavity (25) through which cooling air passes.

3. A method for cooling the stator of a high-altitude long-core wind turbine according to claim 2, characterized in that: First ventilation holes (37) are arranged at intervals along the circumference of the fourth ring plate (15) of the second pressure equalizing chamber (25) so that the air inlet chamber (27) is connected to the second pressure equalizing chamber (25); second ventilation holes (46) are arranged at intervals along the circumference of the sixth ring plate (14), and the second ventilation holes (46) are only distributed on the sixth ring plate (14) corresponding to the first air outlet chamber (28) and are used to connect to the first space (29); third ventilation holes (47) are arranged at intervals along the circumference of the seventh ring plate (16), and the third ventilation holes (47) are only distributed on the seventh ring plate (16) corresponding to the second air outlet chamber (52) and are used to connect to the second space (30); the second ventilation holes (46) and the third ventilation holes (47) are located at the same position on the circumference.

4. A method for cooling the stator of a high-altitude long-core wind turbine according to claim 3, characterized in that: The sixth ring plate (14) is located above the conical ring plate (17); the third ring plate (10), the sixth ring plate (14) and the conical ring plate (17) enclose a first space (29); an eighth ring plate (18) is arranged below the seventh ring plate (16); one end of the eighth ring plate (18) is connected to the third ring plate (10) and the other end is connected to the fifth ring plate (11); the third ring plate (10), the fifth ring plate (11), the seventh ring plate (16) and the eighth ring plate (18) enclose a second space (30); A fourth ventilation hole (38) is provided along the circumference of the third ring plate (10) in the first space (29) and the second space (30) for connecting the first space (29) to the second space (30); a ninth ring plate (19) is provided below the eighth ring plate (18); one end of the ninth ring plate (19) is connected to the third ring plate (10) and the other end is connected to the fifth ring plate (11); the third ring plate (10), the fifth ring plate (11), the eighth ring plate (18) and the ninth ring plate (19) enclose a third space (31).

5. A method for cooling a high-altitude long-core wind turbine stator by zones according to any one of claims 1 to 4, characterized in that: The stator core (8) is arranged in the rotor cylinder (1), a rotor magnetic steel (2) is arranged between the rotor cylinder (1) and the stator core (8), a ventilation slot steel (43) is arranged between two adjacent sections of the stator core (8), the two sections of the stator core (8) and the ventilation slot steel (43) form a radially separated radial ventilation duct (42), a tensioning screw (45) passes through the multiple sections of the stator core (8), and both ends of the tensioning screw (45) are fixed by stator end pressure plates (44); an air gap (41) is arranged between the rotor magnetic steel (2) and the stator core (8).

6. A method for cooling the stator of a high-altitude long-core wind turbine according to claim 5, characterized in that: The rotor cylinder (1) is connected to the rotor non-driving end ring plate (3), the rotor non-driving end ring plate (3) is equipped with a sealing structure M, an eleventh ring plate (5) is arranged between the rotor non-driving end ring plate (3) and the fifth ring plate (11), one end of the eleventh ring plate (5) is connected to the fifth ring plate (11), and the other end is connected to the rotor non-driving end ring plate (3), the eleventh ring plate (5) and the fifth ring plate (11), the stator end pressure plate (44), the rotor non-driving end ring plate (3), and the rotor cylinder (1) form a fourth space (32); the rotor non-driving end ring plate (3) is connected to one end of the twelfth ring plate (35); a thirteenth ring plate (36) is arranged below the eleventh ring plate (5), one end of the thirteenth ring plate (36) is connected to the fifth ring plate (11), and the other end is connected to the other end of the twelfth ring plate (35), and the rotor non-driving end ring plate (3), the eleventh ring plate (5) and the fifth ring plate (11), the stator end pressure plate (44), the rotor non-driving end ring plate (3), and the rotor cylinder (1) form a fourth space (32); the rotor non-driving end ring plate (3) is connected to one end of the twelfth ring plate (35); The plate (5), the twelfth ring plate (35), the thirteenth ring plate (36) and the fifth ring plate (11) enclose a fifth space (4); fifth ventilation holes (53) are evenly arranged along the circumference of the eleventh ring plate (5) for connecting the fourth space (32) to the fifth space (4); the first ring plate (9), the conical ring plate (17), the third ring plate (10) and the rotor cylinder (1) enclose a sixth space (33); a sixth ventilation hole (40) is arranged on the third ring plate (10) located in the sixth space (33) and the third space (31) for connecting the sixth space (33) to the third space (31); and a seventh ventilation hole (39) is arranged along the circumference of the fifth ring plate (11) located in the second space (30), the third space (31) and the fifth space (4), so that the second space (30) and the third space (31) are both connected to the fifth space (4).

7. A method for cooling the stator of a high-altitude long-core wind turbine according to claim 6, characterized in that: The fifth ring plate (11) and the twelfth ring plate (35) are provided with a plurality of eighth ventilation holes on the circumference thereof for the plurality of first ventilation ducts (21) to pass through, one end of the first ventilation duct (21) being located in the first pressure equalizing chamber (24) and the other end being located outside the fifth space (4); the second ring plate (13), the third ring plate (10), the fourth ring plate (15), the fifth ring plate (11) and the twelfth ring plate (35) are provided with a plurality of ninth ventilation holes on the circumference thereof for the plurality of second ventilation ducts ( 22) passes through, one end of the second ventilation duct (22) is located in the third pressure equalizing chamber (26), and the other end is located outside the fifth space (4); the fifth ring plate (11) and the twelfth ring plate (35) are provided with a plurality of tenth ventilation holes correspondingly on the circumference for a plurality of third ventilation ducts (23) to pass through, one end of the third ventilation duct (23) is located in the second pressure equalizing chamber (25), and the other end is located outside the fifth space (4); a plurality of air outlet ducts (34) are installed along the circumference of the twelfth ring plate (35).

8. A method for reducing the temperature difference of a high-altitude long-core permanent magnet wind turbine stator according to claim 7, characterized in that: The first ventilation duct (21), the second ventilation duct (22) and the third ventilation duct (23) are configured as a set of air inlet ducts. The air inlet ducts and air outlet ducts (34) are evenly distributed along the circumference and are 6 to 8 in number. A blower (49) is installed at the air inlet duct.

9. A method for reducing the temperature difference of a stator of a long core permanent magnet wind turbine at high altitude according to any one of claims 1 to 4, characterized in that: The radial dimensions of the air inlet cavity (27), the first air outlet cavity (28), and the second air outlet cavity (52) are not less than 100 millimeters.

10. A method for reducing the temperature difference of a stator of a long core permanent magnet wind turbine at high altitude according to any one of claims 1 to 4, characterized in that: The radial dimension of the first pressure equalizing chamber (24) is not less than 150 mm; the radial dimension of the second pressure equalizing chamber (25) is not less than 100 mm; and the radial dimension of the third pressure equalizing chamber (26) is not less than 200 mm.

11. The method for reducing the temperature difference of the stator of a long core permanent magnet wind turbine at high altitude according to claim 5, characterized in that: The air gap (41) has a value of 4-5 mm.

12. A method for reducing the temperature difference of a stator of a long-core permanent magnet wind turbine at high altitude as claimed in claim 5, characterized in that: The radial ventilation channel (42) has an axial height of 3-4 mm.

13. The method for reducing the temperature difference of the stator of a long core permanent magnet wind turbine at high altitude according to claim 5, characterized in that: The total axial length of the stator core (8) is more than 1500 mm, and the axial length of each section of the stator core (8) is 20-30 mm and is evenly distributed in the axial direction.

14. The method for reducing the temperature difference of the stator of a long core permanent magnet wind turbine at high altitude according to claim 6, characterized in that: The sealing structure M comprises a rotor non-driving end ring plate (3), a sealing mounting ring plate (6), a pressure block (50), a C-type seal (51), and a sealing ring plate (48). The sealing mounting ring plate (6), the pressure block (50), the C-type seal (51), and the sealing ring plate (48) are mounted on the rotor non-driving end ring plate (3). Grooves for mounting the C-type seal (51) are machined on both end surfaces on the inner diameter side of the rotor non-driving end ring plate (3), and the C-type seal (51) is fixed by means of the pressure block (50). The lips of the C-type seal (51) are all facing the inner diameter side, and are squeezed and matched with the sealing ring plate (48) mounted on the sealing mounting ring plate (6) to complete the sealing of the motor dynamic and static separation.

15. The method for reducing the temperature difference of the stator of a long core permanent magnet wind turbine at high altitude according to claim 4, characterized in that: The number of the fourth ventilation holes (38) is consistent with that of the second ventilation holes (46) or the third ventilation holes (47), and the positions on the circumference are the same as those of the second ventilation holes (46) and the third ventilation holes (47).

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