A method for sectional cooling of the stator of a high-altitude and long-core wind power generator

Abstract

The present invention discloses a method for sectional cooling of the stator of a high-altitude long-core wind power generator, which relates to the technical field of ventilation and cooling of permanent magnet direct-drive wind power generators. The cooling air path of the present invention includes one path of air for cooling the stator near the non-drive end, another path of air for cooling the stator near the drive end, and a third path of air for circumferential flow through the air gap to cool the middle part of the stator. Moreover, sufficient and uniform cooling air is obtained for each section of the stator core and the stator coils located at each section of the stator core, thereby improving the cooling effect, reducing the stator temperature difference, and enhancing the utilization efficiency of the cooling air.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation and cooling of permanent magnet direct drive wind power motors, and specifically relates to a method for stator partition cooling of high altitude and long iron core wind power motors, which is applicable to high altitude and large capacity permanent magnet low speed wind power motors. Background Art

[0002] The rotational speed of a low speed permanent magnet wind power motor is low, only about 10 r / min, and the pressure generated by the rotating components is only a few pascals, which cannot drive the air to flow inside the motor to carry away the losses during motor operation. Generally, a special fan is used as the main pressure source for air flow. For a relatively large capacity permanent magnet low speed wind power motor with a long iron core, the radial ventilation method of the iron core is adopted. After the cooling air passes through the stator, it enters the air gap and diffuses towards both ends of the iron core. Finally, it passes through the end part of the stator winding and the ventilation duct. Since the iron core is long, the ventilation path for directly cooling the stator is long. In addition, due to structural limitations, it is generally impossible to evenly arrange the fans circumferentially on the machine 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, making it difficult to further increase the electromagnetic load, and affecting the economy of the motor.

[0003] For example, in a Chinese patent, the authorized announcement number is CN110429747B, the authorized announcement date is November 20, 2020, and the name is a method for reducing the circumferential temperature difference between the motor coil and the iron core. In this method, the cooling air enters the large cavity from the lower air inlet duct. When the cooling air enters the air gap from the large cavity, it cools the end part of the stator iron core at the same time. The cooling air enters the air gap for turbulent flow and enters the stator ventilation groove for heat exchange. However, since the stator iron core is long, during the process of the cooling air flowing from the air gap at one end of the stator to the other end of the stator, due to the influence of the heat dissipated by the stator iron core, the stator coil, and the rotor permanent magnet, the temperature of the cooling air gradually increases, and the cooling effect on the stator end part is not significant. Since the longer the travel distance, the higher the temperature of the cooling air flowing into the stator ventilation groove, the cooling of each section of the stator iron core is uneven, and the cooling efficiency is not high; when the cooling air enters the air inlet cavity from the large cavity, due to the small radial dimension of the air inlet cavity, the air resistance is large, and less cooling air enters. On the one hand, this leads to a short direct contact time with the stator iron core and a short heat exchange time, resulting in low heat exchange efficiency. On the other hand, when the cooling air flows from one end of the air inlet cavity to the other end, due to the influence of the heat dissipated by the stator iron core and the stator coil, the temperature of the cooling air gradually increases, resulting in uneven cooling of each section of the stator iron core and low cooling efficiency.

[0004] Especially for high altitude and large capacity permanent magnet low speed wind power motors, due to the low air density, it is more difficult to cool down, further restricting the improvement of the motor electromagnetic load. Summary of the Invention

[0005] To address the deficiencies of the above-mentioned existing technologies, the present invention provides a method for zoned cooling of the stator of a high-altitude long-core wind power generator, which is applicable to high-altitude large-capacity permanent magnet low-speed wind power generators.

[0006] The present invention is achieved through the following calculation scheme:

[0007] A method for zoned cooling of the stator of a high-altitude long-core wind power generator, characterized in that: after the cooling air enters the first pressure equalizing chamber from the first ventilation duct, it disperses in the circumferential direction and flows to the radial ventilation ducts distributed on the circumference of the stator core corresponding to the first pressure equalizing chamber to the air gap, and then enters the fourth space to cool the non-drive end of the stator coil. At the same time, the cooling air flows from the fourth space to the fifth space;

[0008] After the cooling air enters the third pressure equalizing chamber from the second ventilation duct, it also disperses in the circumferential direction and flows to the radial ventilation ducts 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 drive 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;

[0009] After the cooling air enters the second pressure equalizing chamber from the third ventilation duct, it disperses in the circumferential direction and enters the air inlet chamber, and then flows to the radial ventilation ducts distributed on the circumference of the stator core corresponding to the air inlet chamber to the air gap. It flows through the air gap to the radial ventilation ducts distributed on the circumferences corresponding to the first air outlet chamber and the second air outlet chamber, and 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 and the second space and then enters 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 paths of air converge in the fifth space and are discharged through the air outlet duct installed on the fifth space.

[0010] A cavity is formed between the stator core and the stator frame. A third ring plate is installed on the stator frame, and this third ring plate divides the cavity into two chambers, a left chamber and a right chamber. A plurality of axial rib plates are arranged at intervals in the cavity. The axial rib plates divide the cavity into a plurality of axial cavities, and the axial cavities are evenly distributed along the circumference of the stator frame. A part of the plurality of axial cavities are air inlet cavities, and a part are air outlet cavities. The air inlet cavities and the air outlet cavities are arranged adjacent to each other and are evenly distributed along the circumference. Ventilation channels are opened on the third ring plate of the air inlet cavity, and the air inlet cavity is formed into an air inlet cavity that is longer axially. The air outlet cavity is divided by the third ring plate into a first air outlet cavity and a second air outlet cavity. A fourth space is provided at the non-driving end of the stator coil. A fifth space is provided below the fourth space and is connected to the fourth space. A first pressure equalizing cavity and a second pressure equalizing cavity are provided between the fifth space and the axial cavity. The second pressure equalizing cavity is connected to the air inlet cavity. A third pressure equalizing cavity is provided adjacent to the driving end of the stator coil in the axial cavity. A first ventilation pipe, a second ventilation pipe, and a third ventilation pipe are installed in the fifth space. The air outlet of the first ventilation pipe is placed in the first pressure equalizing cavity and is connected to the first pressure equalizing cavity. The air outlet of the second ventilation pipe passes through the air inlet cavity and is placed in the third pressure equalizing cavity and is connected to the third pressure equalizing cavity. The air outlet of the third ventilation pipe is placed in the second pressure equalizing cavity and is connected to the second pressure equalizing cavity. A first space and a second space are provided below the cavity. The first air outlet cavity is connected to the first space, and the second air outlet cavity is connected to the second space. The first space is connected to the second space, and the second space is connected to the fifth space. A sixth space and a third space are installed below the first space and the second space. The sixth space is connected to the third space, and the third space is connected to the fifth space.

[0011] Further, 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 number of axial rib plates that are sequentially arranged on the inner diameter side back of the stator core. A sixth ring plate is provided 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 provided 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. The bottom end of the fourth ring plate is connected to the seventh ring plate. The cavity is formed by the second ring plate, the sixth ring plate, the seventh ring plate, and the fourth ring plate. The third ring plate divides the cavity into two chambers, a left chamber and a right chamber. One chamber is formed by the second ring plate, the third ring plate, and the sixth ring plate, and the other chamber is formed by the third ring plate, the seventh ring plate, and the fourth ring plate. An inclined 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. The first ring plate, the second ring plate, and the conical ring plate enclose the third pressure equalizing cavity. A tenth ring plate is provided 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 pressure equalizing cavity and the second pressure equalizing cavity through which the cooling air passes are formed by the fourth ring plate, the fifth ring plate, the seventh ring plate, and the tenth ring plate.

[0012] Further, first ventilation holes are circumferentially and spacedly arranged on the fourth ring plate of the second pressure equalizing chamber, so that the air inlet chamber is communicated with the second pressure equalizing chamber; second ventilation holes are circumferentially and spacedly arranged 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 communicating with the first space; third ventilation holes are circumferentially and spacedly arranged 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 communicating with the second space; the second ventilation holes and the third ventilation holes are in the same position on the circumference.

[0013] Further, the sixth ring plate is located above the conical ring plate. The third ring plate, the sixth ring plate and the conical ring plate enclose the first space. An 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 enclose the second space; fourth ventilation holes are arranged on the third ring plate located in the first space and the second space along the circumference for communicating the first space with the second space; a 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. The third ring plate, the fifth ring plate, the eighth ring plate and the ninth ring plate enclose the third space.

[0014] Further, the stator core is arranged inside the rotor cylinder. Rotor magnets are arranged between the rotor cylinder and the stator core. Ventilation channel steels are arranged between adjacent two sections of the stator core. The two sections of the stator core and the ventilation channel steel form a radially separated radial ventilation duct. Tightening screws penetrate through multiple sections of the stator core, and both ends of the tightening screws are fixed by stator end pressing plates; an air gap is arranged between the rotor magnets and the stator core.

[0015] Further, the rotor cylinder is connected to the rotor non-driving end ring plate. A sealing structure M is assembled on the rotor non-driving end ring plate. 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, the fifth ring plate, the stator end pressing plate, the rotor non-driving end ring plate and the rotor cylinder form the fourth space; one end of a twelfth ring plate is connected to the rotor non-driving end 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 rotor non-driving end ring plate, the eleventh ring plate, the twelfth ring plate, the thirteenth ring plate and the fifth ring plate enclose the fifth space; fifth ventilation holes are evenly arranged on the eleventh ring plate along the circumference for communicating the fourth space with the fifth space; the first ring plate, the conical ring plate, the third ring plate and the rotor cylinder enclose the sixth space. Sixth ventilation holes are arranged on the third ring plate located in the sixth space and the third space for communicating the sixth space with the third space. Seventh ventilation holes are arranged on the fifth ring plate located in the second space, the third space and the fifth space along the circumference, so that the second space and the third space are both communicated with the fifth space.

[0016] Further, a plurality of eighth ventilation holes are correspondingly formed in the fifth ring plate and the twelfth ring plate in the circumferential direction for a plurality of first ventilation pipes to pass through. One end of each first ventilation pipe is located in the first pressure equalizing chamber, and the other end is located outside the fifth space. A plurality of ninth ventilation holes are correspondingly formed in the second ring plate, the third ring plate, the fourth ring plate, the fifth ring plate, and the twelfth ring plate in the circumferential direction for a plurality of second ventilation pipes to pass through. One end of each second ventilation pipe is located in the third pressure equalizing chamber, and the other end is located outside the fifth space. A plurality of tenth ventilation holes are correspondingly formed in the fifth ring plate and the twelfth ring plate in the circumferential direction for a plurality of third ventilation pipes to pass through. One end of each third ventilation pipe is located in the second pressure equalizing chamber, and the other end is located outside the fifth space. A plurality of air outlet pipes are installed along the circumference of the twelfth ring plate.

[0017] Further, the first ventilation pipe, the second ventilation pipe, and the third ventilation pipe are combined and configured as a set of air inlet pipes. The air inlet pipes and the air outlet pipes are evenly distributed along the circumference, and the number is 6 - 8. A blower is installed at the air inlet pipes.

[0018] Further, the radial dimensions of the air inlet chamber, the first air outlet chamber, and the second air outlet chamber are not less than 100 mm.

[0019] Further, 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.

[0020] Further, the air gap value is 4 - 5 mm.

[0021] Further, the axial height of the radial ventilation duct is 3 - 4 mm.

[0022] Further, the total axial length of the stator core is more than 1500 mm, the axial length of each section of the stator core is 20 - 30 mm, and they are evenly distributed axially.

[0023] Further, the sealing structure M includes a rotor non - driving - end ring plate, a sealing mounting ring plate, a pressing block, a C - type seal, and a sealing ring plate. The sealing mounting ring plate, the pressing block, the C - type seal, and the sealing ring plate are installed on the rotor non - driving - end ring plate. Grooves for installing the C - type seal are machined on both end faces of the inner diameter side of the rotor non - driving - end ring plate, and the C - type seal is fixed by means of the pressing block. The lips of the C - type seal all face the inner diameter side and are in extrusion fit with the sealing ring plate installed on the sealing mounting ring plate to complete the sealing at the dynamic - static separation of the motor.

[0024] Further, the number of the fourth ventilation holes is the same as that of the second ventilation holes or the third ventilation holes, and the positions of the fourth ventilation holes are the same as those of the second ventilation holes and the third ventilation holes in the circumferential direction.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. By adopting radial ventilation cooling at the straight section near the end of the stator and at the stator end, and 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.

[0027] 2. In the present invention, after a first path of cooling air enters the first pressure equalizing chamber from the first ventilation duct, it spreads out circumferentially and flows to the radial ventilation ducts distributed on the circumference of the stator core corresponding to the first pressure equalizing 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 near the non-driving end; on the other hand, the cooling air has a short travel distance to the non-driving end of the stator coil, and can fully cool the non-driving end of the stator coil, improving the efficiency of the cooling air.

[0028] 3. In the present invention, after a second path of cooling air enters the third pressure equalizing chamber from the second ventilation duct, it also spreads out in the circumferential direction and flows to the radial ventilation ducts 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 and is affected by the cooling air in the air inlet chamber, and 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 travel to the third pressure equalizing chamber. Therefore, it can ensure sufficient cooling of the straight section of the stator near the driving end, and at the same time can also ensure sufficient cooling of the driving end of the stator coil, improving the efficiency of the cooling air.

[0029] 4. In the first aspect of the present invention, the radial dimensions of the air inlet chamber, the first air outlet chamber and the second air outlet chamber are large, which can reduce the wind resistance, ensure that there is sufficient cooling air in the air inlet chamber to cool the stator core, and after the cooling air exchanges heat with the stator core, it can ensure that the hot air flows out smoothly from the first air outlet chamber and the second air outlet chamber; in the second aspect, the radial dimension of the air inlet chamber is large, the wind resistance is reduced, and enough cooling air enters. The cooling air flows from the corresponding air inlet chamber to the radial ventilation ducts and the air gap, and flows through the radial ventilation ducts to the air outlet chamber, 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. Thus, each section of the stator core and the stator coil at each section of the stator core can obtain more sufficient cooling air, improving the cooling effect, and the axial temperature difference reduction effect is significant.

[0030] 5. In the present invention, each section of the stator core is 20% shorter than the stator core of a conventional larger-capacity permanent magnet low-speed wind power generator. Since the stator core and the coil adopt radial ventilation cooling, the shorter the distance between the radial ventilation ducts, the greater the heat dissipation area of the stator core and the stator coil can be increased to a greater extent, improving the cooling effect.

[0031] 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 of the height of the radial ventilation duct can increase the number of radial ventilation ducts without significantly increasing the total length of the iron core as much as possible, thereby increasing the heat dissipation surface area and facilitating the improvement of the cooling effect.

[0032] 7. In the present invention, the first ventilation duct, the second ventilation duct and the third ventilation duct are combined and configured as a set of air inlet ducts. The air inlet ducts and the air outlet ducts are evenly distributed along the circumference, and the number is 6 - 8. A blower is installed at the air inlet duct, which is conducive to making the cooling air flow more evenly in the circumference, reducing the circumferential air temperature difference and ensuring the ventilation and cooling effect.

[0033] 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 air 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 - 25%. The utilization rate of the cooling air is improved, so that the wind power generator can adapt to the adverse condition of lower air density in high altitude areas. Description of the Drawings

[0034] Figure 1 Longitudinal sectional view of the wind power generator;

[0035] Figure 2 Non-driving end view of the wind power generator;

[0036] Figure 3 Cross-sectional view A - A of the wind power generator;

[0037] Figure 4 Cross-sectional view B - B of the wind power generator;

[0038] Figure 5 Cross-sectional view C - C of the wind power generator;

[0039] Figure 6 Cross-sectional view D - D of the wind power generator;

[0040] Figure 7 Development view of the cavity;

[0041] Figure 8 Partial view of the sealing structure M;

[0042] Reference numerals: 1 - rotor cylinder, 2 - rotor permanent magnet, 3 - non - driving end ring plate of rotor, 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 pressure equalizing chamber, 25 - second pressure equalizing chamber, 26 - third pressure equalizing 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 pressing plate, 45 - tension 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 implementation mode

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. In the drawing materials, solid lines and dashed arrows are used to distinguish cold air and hot air flows, and ⊕ and ⊙ are used in the cross - sectional view to represent the inflow direction of the vertical cross - section of the air flow and the outflow direction of the vertical cross - section of the air flow. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0044] Embodiment 1

[0045] A method for cooling the stator of a high - altitude long - core wind power generator by zoning. After the cooling air enters the first pressure equalizing chamber 24 from the first ventilation duct 21, it disperses in the circumferential direction and flows to the radial ventilation ducts 42 distributed on the circumference of the stator core 8 corresponding to the first pressure equalizing chamber 24, then 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;

[0046] After the cooling air enters the third pressure equalizing chamber 26 from the second ventilation duct 22, it also disperses in the circumferential direction and flows to the radial ventilation ducts 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;

[0047] 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, and 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, and flows through the air gap 41 to the radial ventilation ducts 42 distributed on the circumferences corresponding to the first air outlet chamber 28 and the second air outlet chamber 52, and 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 and the second space 30 and then 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 paths of air converge in the fifth space 4 and are discharged through the air outlet duct 34 installed on the fifth space 4.

[0048] A cavity is formed between the stator core 8 and the stator frame. A third ring plate 10 is installed on the stator frame, and the third ring plate 10 divides the cavity into two left and right chambers; a plurality of axial rib plates 12 are arranged at intervals in the chamber, and the axial rib plates 12 divide the chamber into a plurality of axial chambers. The axial chambers are evenly distributed along the circumference of the stator frame. A part of the plurality of axial chambers is an air inlet chamber 27, and a part is an air outlet chamber. The air inlet chamber 27 and the air outlet chamber are adjacent and evenly distributed along the circumference; ventilation channels are formed in the third ring plate 10 of the air inlet chamber 27, and the air inlet chamber 27 is formed into an air inlet chamber 27 that is longer axially; the air outlet chamber is divided into a first air outlet chamber 28 and a second air outlet chamber 52 by the third ring plate 10; a fourth space 32 is arranged at the non-driving end of the stator coil 7, and a fifth space 4 is arranged below the fourth space 32 and communicated with the fourth space 32; a first pressure equalizing chamber 24 and a second pressure equalizing chamber 25 are arranged between the fifth space 4 and the axial chamber. The second pressure equalizing chamber 25 is communicated with the air inlet chamber 27. A third pressure equalizing chamber 26 is arranged adjacent to the driving end of the stator coil 7 in the axial chamber. A first ventilation pipe 21, a second ventilation pipe 22 and a third ventilation pipe 23 are installed in the fifth space 4; the air outlet of the first ventilation pipe 21 is placed in the first pressure equalizing chamber 24 and communicated with the first pressure equalizing chamber 24; the air outlet of the second ventilation pipe 22 passes through the air inlet chamber 27 and is placed in the third pressure equalizing chamber 26 and communicated with the third pressure equalizing chamber 26; the air outlet of the third ventilation pipe 23 is placed 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 arranged below the cavity. The first air outlet chamber 28 is communicated with the first space 29, and 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 communicated with the third space 31, and the third space 31 is communicated with the fifth space 4.

[0049] During implementation, as Figure 1 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 pipe 21, spreads out on the circumference, flows to the radial ventilation ducts 42 distributed on the circumference of the stator core 8 corresponding 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 near the non-driving end; on the other hand, the cooling air has a short travel distance to the non-driving end of the stator coil 7, and the cooling air can contact the non-driving end of the stator coil 7 faster, fully cooling the non-driving end of the stator coil 7 and improving the efficiency of the cooling air.

[0050] After the second path of cooling air enters the third pressure equalizing chamber 26 from the second ventilation duct 22, it also disperses in the circumferential direction and flows to the radial ventilation ducts 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 drive end of the stator coil 7. Since the second ventilation duct 22 passes through the air inlet chamber 27 and is affected by the cooling air in the air inlet chamber 27, and 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 process of flowing to the third equalizing chamber. Therefore, it can ensure sufficient cooling of the stator straight section near the drive end and also ensure sufficient cooling of the drive end of the stator coil, improving the efficiency of the cooling air.

[0051] After the third 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 ducts 42 distributed on the circumference of the stator core 8 corresponding to the air inlet chamber 27 to the air gap 41, and flows through the air gap 41 to the radial ventilation ducts 42 distributed on the circumferences corresponding to the first air outlet chamber 28 and the second air outlet chamber 52, and enters the first air outlet chamber 28 and the second air outlet chamber 52. 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 the 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 smoothly from the first air outlet chamber 28 and the second air outlet chamber 52. On the other hand, the radial dimension of the air inlet chamber 27 is large, the wind resistance is reduced, and enough cooling air enters. The cooling air flows from the corresponding air inlet chamber 27 to the radial ventilation ducts 42, the air gap 41, and through the radial ventilation channels to the corresponding air outlet chambers, 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. On the third hand, when the cooling air flows from one end of the air inlet chamber 27 to the other end, it will be affected by the heat dissipated by the stator core 8 and the stator coil 7, resulting in a partial increase in the temperature of the cooling air. However, since the cooling air entering the air inlet chamber 27 is sufficient, the difference in the air volume of the radial ventilation ducts 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. Thus, 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, improving the cooling effect and the temperature reduction effect is significant.

[0052] The present invention cools the stator core 8 and is particularly applicable to high-altitude large-capacity permanent magnet low-speed wind power motors, where the air density is low and it is more difficult to cool down.

[0053] Even when the air outlet pipe in the prior art with the authorization announcement number CN110429747B, the authorization announcement date of November 20, 2020, and the name of a method for reducing the circumferential temperature difference between the motor coil and the iron core is used as the air inlet, when the air enters from the air outlet pipe, the cooling air enters the air outlet cavity and flows to the stator ventilation groove corresponding to the air outlet cavity, and is released from the stator after exiting from the air gap 41. In this process, due to the small radial dimension of the air outlet cavity and the large air resistance, less cooling air enters the air outlet cavity, resulting in a short direct contact time between the stator iron core 8 and a short heat exchange time, and low heat exchange efficiency; when the cooling air flows from one end of the air outlet cavity to the other end of the air outlet cavity, due to the influence of the heat dissipation of the stator iron core 8 and the stator coil 7, the temperature of the cooling air gradually increases, and the cooling air with a higher temperature flows to the stator ventilation groove, resulting in uneven cooling of each section of the stator iron core 8 and low cooling efficiency; the cooling air flows from the stator ventilation groove to the air gap 41, and after flowing from the air gap 41 to both ends of the stator and then being released from the stator, since the cooling air has already undergone heat exchange with the stator iron core 8 and then flows from the air gap 41 to both ends of the stator for cooling, the cooling effect is low. Compared with the prior art, it is difficult to achieve the cooling effect in the present invention.

[0054] Embodiment 2

[0055] This embodiment further elaborates and supplements the implementation manner of the present invention on the basis of Embodiment 1.

[0056] Such as Figures 1-7As 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, a fifth ring plate 11 and a number of axial rib plates 12 arranged in sequence on the back of the inner diameter side 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. The bottom end of the fourth ring plate 15 is connected to the seventh ring plate 16. A cavity 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 third ring plate 10 divides the cavity into two left and right chambers. One chamber is formed by the second ring plate 13, the third ring plate 10 and the sixth ring plate 14, and the other chamber is formed by the third ring plate 10, the seventh ring plate 16 and the fourth ring plate 15. An inclined conical ring plate 17 is connected between the first ring plate 9 and the third ring plate 10. 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. A first pressure equalizing chamber 24 and a second pressure equalizing chamber 25 through which cooling air passes are formed by the fourth ring plate 15, the fifth ring plate 11, the seventh ring plate 16 and the tenth ring plate 20.

[0057] First ventilation holes 37 are arranged at circumferential intervals on the fourth ring plate 15 that forms the second pressure equalizing chamber 25, so that the air inlet chamber 27 is communicated with the second pressure equalizing chamber 25. Second ventilation holes 46 are arranged at circumferential intervals on the sixth ring plate 14. 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 communicate with the first space 29. Third ventilation holes 47 are arranged at circumferential intervals on the seventh ring plate 16. 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 communicate with the second space 30. The positions of the second ventilation holes 46 and the third ventilation holes 47 are the same in the circumferential direction.

[0058] 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. Fourth ventilation holes 38 are arranged along the circumference on the third ring plate 10 located in the first space 29 and the second space 30 for communicating the first space 29 with the second space 30. A ninth ring plate 19 is arranged 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.

[0059] Embodiment 3

[0060] This embodiment further elaborates and supplements the implementation manner of the present invention on the basis of Embodiment 1 or Embodiment 2.

[0061] The stator core 8 is arranged inside the rotor cylinder 1. A rotor magnet 2 is arranged between the rotor cylinder 1 and the stator core 8. Ventilation channel steel 43 is arranged between adjacent two sections of the stator core 8. Two sections of the stator core 8 and the ventilation channel steel 43 form a radially separated radial ventilation duct 42. Tensioning screws 45 penetrate through multiple sections of the stator core 8, and both ends of the tensioning screws 45 are fixed by stator end pressing plates 44. An air gap 41 is arranged between the rotor magnet 2 and the stator core 8.

[0062] The rotor cylinder 1 is connected to the non-driven end ring plate 3 of the rotor. The non-driven end ring plate 3 of the rotor is equipped with a sealing structure M. An eleventh ring plate 5 is arranged between the non-driven end ring plate 3 of the rotor 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 non-driven end ring plate 3 of the rotor. The eleventh ring plate 5, the fifth ring plate 11, the stator end pressing plate 44, the non-driven end ring plate 3 of the rotor, and the rotor cylinder 1 form a fourth space 32. One end of the twelfth ring plate 35 is connected to the non-driven end ring plate 3 of the rotor. 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. A fifth space 4 is enclosed by the non-driven end ring plate 3 of the rotor, the eleventh ring plate 5, the twelfth ring plate 35, the thirteenth ring plate 36, and the fifth ring plate 11. Fifth ventilation holes 53 are uniformly arranged along the circumference on the eleventh ring plate 5 for the fourth space 32 to communicate 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 enclose a sixth space 33. Sixth ventilation holes 40 are arranged on the third ring plate 10 located in the sixth space 33 and the third space 31 for the sixth space 33 to communicate 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 both the second space 30 and the third space 31 communicate with the fifth space 4.

[0063] A plurality of eighth ventilation holes are correspondingly opened on the fifth ring plate 11 and the twelfth ring plate 35 in the circumferential direction for a plurality of first ventilation pipes 21 to pass through. One end of the first ventilation pipe 21 is located in the first pressure equalizing chamber 24, and the other end is located outside the fifth space 4. A plurality of ninth ventilation holes are correspondingly opened on 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 in the circumferential direction for a plurality of second ventilation pipes 22 to pass through. One end of the second ventilation pipe 22 is located in the third pressure equalizing chamber 26, and the other end is located outside the fifth space 4. A plurality of tenth ventilation holes are correspondingly opened on the fifth ring plate 11 and the twelfth ring plate 35 in the circumferential direction for a plurality of third ventilation pipes 23 to pass through. One end of the third ventilation pipe 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 pipes 34 are installed along the circumference on the twelfth ring plate 35.

[0064] Embodiment 4

[0065] This embodiment further elaborates and supplements the implementation manner of the present invention on the basis of Embodiment 1, Embodiment 2, or Embodiment 3.

[0066] The first ventilation duct 21, the second ventilation duct 22, and the third ventilation duct 23 are combined and configured as a set of air inlet ducts. The air inlet ducts and the air outlet duct 34 are evenly distributed along the circumference, with a quantity of 6 - 8. A blower 49 is installed at the air inlet ducts, which is conducive to making the cooling air flow more evenly on the circumference, ensuring the ventilation and cooling effect, reducing the circumferential wind temperature difference, and guaranteeing the ventilation and cooling effect.

[0067] 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 mm. Firstly, the large radial dimensions of the air inlet cavity 27, the first air outlet cavity 28, and the second air outlet cavity 52 can reduce the wind resistance, ensure that there is sufficient cooling air in the air inlet cavity 27 to cool the stator core 8, and after the cooling air exchanges heat with the stator core 8, it can ensure that the hot air flows out smoothly from the first air outlet cavity 28 and the second air outlet cavity 52. Secondly, the large radial dimension of the air inlet cavity 27 reduces the wind resistance, and enough cooling air enters. The cooling air flows from the corresponding air inlet cavity 27 to the radial ventilation ducts 42 and the air gap 41, and through the radial ventilation channels to the corresponding air outlet cavities, 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 reduction effect is significant. Thirdly, when the cooling air flows from one end of the air inlet cavity 27 to the other end, the temperature of the cooling air will be partially increased due to the heat dissipated by the stator core 8 and the stator coil 7. However, since the cooling air entering the air inlet cavity 27 is sufficient, the difference in the air volume of the radial ventilation ducts 42 is reduced, 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, improving the cooling effect and the temperature reduction effect is significant.

[0068] The radial dimension of the first pressure equalizing cavity 24 is not less than 150 mm; the radial dimension of the second pressure equalizing cavity 25 is not less than 100 mm, and the radial dimension of the third pressure equalizing cavity 26 is not less than 200 mm.

[0069] The value of the air gap 41 is 4 - 5 mm. This ensures that the cooling air has sufficient flow space.

[0070] The axial height of the radial ventilation ducts 42 is 3 - 4 mm. The axial height of the radial ventilation ducts 42 is 3 - 4 mm, which is more than 10% smaller than the prior art. The reduction of the axial height of the radial ventilation ducts 42 can increase the number of radial ventilation ducts 42 without significantly increasing the total length of the iron core as much as possible, thereby increasing the heat dissipation surface area and being conducive to improving the cooling effect.

[0071] 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 axially. Compared with the prior art, each section of the stator core 8 in the present invention is 20% shorter than the stator core 8 of a conventional large-capacity permanent magnet low-speed wind power motor. Since the stator core 8 and the stator coil 7 are cooled by radial ventilation, the shorter the spacing of the radial ventilation ducts 42, the greater the heat dissipation area of the stator core 8 and the stator coil 7 can be increased, and the cooling effect can be improved.

[0072] The sealing structure M includes a rotor non-driving end ring plate 3, a sealing mounting ring plate 6, a pressing block 50, a C-shaped seal 51, and a sealing ring plate 48. The sealing mounting ring plate 6, the pressing block 50, the C-shaped seal 51, and the sealing ring plate 48 are mounted on the rotor non-driving end ring plate 3; grooves for mounting the C-shaped seal 51 are machined on both end faces on the inner diameter side of the rotor non-driving end ring plate 3, and the C-shaped seal 51 is fixed by means of the pressing block 50. The lips of the C-shaped seal 51 all face the inner diameter side and are extrusion-fitted with the sealing ring plate 48 mounted on the sealing mounting ring plate 6 to complete the sealing at the motor's static-dynamic separation.

[0073] 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 sectional cooling of the stator of a high-altitude long-core wind power generator, characterized in that: After the cooling air enters the first pressure equalizing chamber (24) from the first ventilation duct (21), it disperses in the circumferential direction, flows to the radial ventilation ducts (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 also disperses in the circumferential direction, flows to the radial ventilation ducts (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 ducts (42) distributed on the circumference of the stator core (8) corresponding to the air inlet chamber (27) to the air gap (41), and flows through the air gap (41) to the radial ventilation ducts (42) distributed on the circumferences corresponding to the first air outlet chamber (28) and the second air outlet chamber (52), and 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) and 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-way air converges into the fifth space (4) and is 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 frame. A third ring plate (10) is installed on the stator frame, and the third ring plate (10) divides the cavity into two chambers on the left and right. A plurality of axial rib plates (12) are arranged at intervals in the chamber, and the axial rib plates (12) divide the chamber into a plurality of axial chambers. The axial chambers are evenly distributed along the circumference of the stator frame. A part of the plurality of axial chambers is the air inlet chamber (27), and a part is the air outlet chamber. The air inlet chamber (27) and the air outlet chamber are arranged adjacent to each other and are evenly distributed along the circumference. Ventilation holes are provided on the third ring plate (10) of the air inlet chamber (27) to form the air inlet chamber (27) that is longer axially. The air outlet chamber is divided into the first air outlet chamber (28) and the second air outlet chamber (52) by the third ring plate (10). A fourth space (32) is provided at the non-driving end of the stator coil (7). The fifth space (4) is provided below the fourth space (32) and is communicated with the fourth space (32). A first pressure equalizing chamber (24) and a second pressure equalizing chamber (25) are provided between the fifth space (4) and the axial chamber. The second pressure equalizing chamber (25) is communicated with the air inlet chamber (27). A third pressure equalizing chamber (26) is arranged adjacent to the driving end of the stator coil (7) in the axial chamber. A first ventilation duct (21), a second ventilation duct (22) and a 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 pressure equalizing chamber (24) and is 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 placed in the third pressure equalizing chamber (26) and is communicated with the third pressure equalizing chamber (26). The air outlet of the third ventilation duct (23) is placed in the second pressure equalizing chamber (25) and is communicated with the second pressure equalizing chamber (25). A first space (29) and a second space (30) are provided below the cavity. 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).The first space (29) has the sixth space (33) and the third space (31) installed below 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. The method for zoned cooling of the stator of a high-altitude long-core wind power generator according to claim 1, characterized in that: The stator frame includes a first ring plate (9), a second ring plate (13), a third ring plate (10), a fourth ring plate (15), a fifth ring plate (11) and a number of axial rib plates (12) arranged in sequence 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). The bottom end of the fourth ring plate (15) is connected to the seventh ring plate (16). A cavity 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 third ring plate (10) divides the cavity into two left and right chambers. One chamber is formed by the second ring plate (13), the third ring plate (10) and the sixth ring plate (14), and the other chamber is formed by the third ring plate (10), the seventh ring plate (16) and the fourth ring plate (15); An inclined conical ring plate (17) is connected between the first ring plate (9) and the third ring plate (10). 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) enclose the 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). The tenth ring plate (20) is located above the seventh ring plate (16). The first pressure equalizing chamber (24) and the second pressure equalizing chamber (25) through which the cooling air passes are formed by the fourth ring plate (15), the fifth ring plate (11), the seventh ring plate (16) and the tenth ring plate (20).

3. A method for zoned cooling of the stator of a high-altitude long-core wind power generator as described in claim 2, characterized in that: The first ventilation holes (37) are circumferentially and spacedly arranged on the fourth ring plate (15) of the second pressure equalizing cavity (25) so that the air inlet cavity (27) is communicated with the second pressure equalizing cavity (25); the second ventilation holes (46) are circumferentially and spacedly arranged 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 cavity (28) for communicating the first space (29); the third ventilation holes (47) are circumferentially and spacedly arranged 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 cavity (52) for communicating the second space (30); the second ventilation holes (46) and the third ventilation holes (47) are in the same position on the circumference.

4. The method for zoned cooling of the stator of a high-altitude long-core wind power generator as described in claim 3, characterized in that: The sixth ring plate (14) is located above the conical ring plate (17), and the first space (29) is formed by enclosing the third ring plate (10), the sixth ring plate (14) and the conical ring plate (17). 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 second space (30) is formed by enclosing the third ring plate (10), the fifth ring plate (11), the seventh ring plate (16) and the eighth ring plate (18); the 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 communicating the first space (29) and the second space (30); a ninth ring plate (19) is arranged 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 space (31) is formed by enclosing the third ring plate (10), the fifth ring plate (11), the eighth ring plate (18) and the ninth ring plate (19).

5. A method for zoned cooling of the stator of a high-altitude long-core wind power generator according to any one of claims 1-4, characterized in that: The stator core (8) is arranged inside the rotor cylinder (1). The rotor magnet (2) is arranged between the rotor cylinder (1) and the stator core (8). The ventilation channel steel (43) is arranged between two adjacent sections of the stator core (8). The two sections of the stator core (8) and the ventilation channel steel (43) form a radially separated radial ventilation duct (42). The tension screw (45) penetrates through multiple sections of the stator core (8), and both ends of the tension screw (45) are fixed by the stator end pressing plate (44); an air gap (41) is arranged between the rotor magnet (2) and the stator core (8).

6. A method for zoned cooling of the stator of a high-altitude long-core wind power generator as described in claim 5, characterized in that: The rotor cylinder (1) is connected to the non-driven end ring plate (3) of the rotor. The non-driven end ring plate (3) of the rotor is equipped with a sealing structure M. An eleventh ring plate (5) is arranged between the non-driven end ring plate (3) of the rotor 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 non-driven end ring plate (3) of the rotor. The eleventh ring plate (5), the fifth ring plate (11), the stator end pressing plate (44), the non-driven end ring plate (3) of the rotor, and the rotor cylinder (1) form a fourth space (32). One end of the non-driven end ring plate (3) of the rotor 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). A fifth space (4) is enclosed by the non-driven end ring plate (3) of the rotor, the eleventh ring plate (5), the twelfth ring plate (35), the thirteenth ring plate (36), and the fifth ring plate (11). Fifth ventilation holes (53) are evenly arranged along the circumference on the eleventh ring plate (5) for the fourth space (32) to communicate 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) enclose a sixth space (33). Sixth ventilation holes (40) are arranged on the third ring plate (10) located in the sixth space (33) and the third space (31) for the sixth space (33) to communicate 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 both the second space (30) and the third space (31) communicate with the fifth space (4).

7. A method for zoned cooling of the stator of a high-altitude long-core wind power generator according to claim 6, characterized in that: The fifth ring plate (11) and the twelfth ring plate (35) are correspondingly provided with a plurality of eighth ventilation holes on the circumference for a plurality of first ventilation pipes (21) to pass through. One end of the first ventilation pipe (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 correspondingly provided with a plurality of ninth ventilation holes on the circumference for a plurality of second ventilation pipes (22) to pass through. One end of the second ventilation pipe (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 correspondingly provided with a plurality of tenth ventilation holes on the circumference for a plurality of third ventilation pipes (23) to pass through. One end of the third ventilation pipe (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 pipes (34) are installed along the circumference on the twelfth ring plate (35).

8. A method for zoned cooling of the stator of a high-altitude long-core wind power generator as described in claim 7, characterized in that: The first ventilation pipe (21), the second ventilation pipe (22), and the third ventilation pipe (23) are combined and configured as a set of air inlet pipes. The air inlet pipes and the air outlet pipes (34) are evenly distributed along the circumference, and the number is 6 - 8. And a blower (49) is installed at the air inlet pipes.

9. A method for sectional cooling of the stator of a high-altitude long-core wind power generator according to any one of claims 1-4, characterized in that: 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.

10. A method for zoned cooling of the stator of a high-altitude long-core wind power generator according to any one of claims 1-4, 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. A method for zoned cooling of the stator of a high-altitude long-core wind power generator as claimed in claim 5, characterized in that: The value of the air gap (41) is 4 - 5 mm.

12. A method for zoned cooling of the stator of a high-altitude long-core wind power generator according to claim 5, characterized in that: The axial height of the radial ventilation duct (42) is 3 - 4 mm.

13. A method for zoned cooling of the stator of a high-altitude long-core wind power generator as claimed in 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 axially.

14. A method for zoned cooling of the stator of a high-altitude long-core wind power generator as described in claim 6, characterized in that: The sealing structure M includes a rotor non-driving end ring plate (3), a sealing mounting ring plate (6), a pressing block (50), a C-shaped seal (51), and a sealing ring plate (48). The sealing mounting ring plate (6), the pressing block (50), the C-shaped seal (51), and the sealing ring plate (48) are installed on the rotor non-driving end ring plate (3); grooves for installing the C-shaped seal (51) are machined on the two end faces on the inner diameter side of the rotor non-driving end ring plate (3), and the C-shaped seal (51) is fixed by means of the pressing block (50). The lips of the C-shaped seal (51) all face the inner diameter side and are extrusion-fitted with the sealing ring plate (48) installed on the sealing mounting ring plate (6) to complete the sealing at the motor's static and dynamic separation.

15. A method for sectional cooling of the stator of a high-altitude long-core wind power generator as claimed in claim 4, characterized in that: 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 their circumferential positions are the same as those of the second ventilation holes (46) and the third ventilation holes (47).

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