A high-altitude long iron core permanent magnet wind power motor stator partition cooling stator frame

Abstract

The application discloses a kind of high altitude long iron core permanent magnet wind power motor stator partition cooling stator frame, belong to permanent magnet direct drive wind power motor technical field;First ventilation duct is communicated with first pressure equalizing chamber, first pressure equalizing chamber is communicated with non-drive end air outlet space and is communicated with fifth space;Second ventilation duct is communicated with third pressure equalizing chamber and is communicated with driving end air outlet space and is communicated with third space, and third space is communicated with fifth space;Third ventilation duct is communicated with second pressure equalizing chamber and is communicated with air inlet chamber and is communicated with first air outlet chamber and second air outlet chamber;First air outlet chamber is communicated with first space and is communicated with second space and is communicated with fifth space;Second air outlet chamber is communicated with second space and is communicated with fifth space, and three cooling paths are gathered fifth space and are communicated with air outlet duct.The application constructs three cooling air passages of wind power motor, can greatly reduce the difference of stator core ventilation duct air volume, so that each iron core section and the stator coil at each iron core section is sufficiently cooled by air, and the cooling effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet direct drive wind turbine technology, specifically relating to a stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine. Background Technology

[0002] Low-speed permanent magnet wind turbines operate at low speeds, only around 10 r / min. The pressure generated by the rotating parts is only a few Pascals, insufficient to drive airflow within the motor to remove operating losses. A dedicated fan is typically used as the primary pressure source for airflow. For larger-capacity permanent magnet low-speed wind turbines with longer cores, radial ventilation is employed. Cooling air passes through the stator, enters the air gap, diffuses to both ends of the core, and finally passes through the stator winding ends and ventilation ducts. Due to the longer core, the ventilation path for directly cooling the stator is long. Furthermore, structural limitations prevent the fans from being evenly distributed around the frame, resulting in uneven temperature distribution around the stator coils and core, with circumferential temperature differences reaching 30K-40K. This hinders further increases in electromagnetic load, impacting motor economics. This is especially true for high-altitude, large-capacity permanent magnet low-speed wind turbines, where low air density further limits electromagnetic load increases.

[0003] In the prior art, a wind turbine generator using stator coils and a long iron core is similar to that disclosed in Chinese invention patent CN102332780A. The wind turbine generator is equipped with a rotor and a stator frame that cooperate with each other. A circular air gap is formed between the rotor and the stator frame. The key feature is that a ring-shaped groove is provided on the outer circumference of the stator frame. Baffles are provided on both sides of the ring-shaped groove, and vertical stiffeners are provided inside along the stator axis, dividing the ring-shaped groove into several ventilation chambers. These ventilation chambers are either cold air chambers or hot air chambers, which are alternately arranged on the outer circumference of the stator frame. The bottom of each chamber is connected to a cold air inlet duct and a hot air outlet duct, respectively.

[0004] The above technologies have the following problems:

[0005] 1. In high-altitude areas, the low air density of the existing wind turbines further limits the increase of the electromagnetic load on the motors.

[0006] 2. Due to the heat generated by the stator core, stator coils, and rotor magnets, the temperature of the cooling air gradually increases, resulting in an insignificant cooling effect on the stator ends.

[0007] 3. 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, resulting in less cooling air entering. On the one hand, this leads to less airflow directly contacting the stator core, resulting in insufficient heat exchange. On the other hand, as the cooling air flows from one end of the air inlet cavity to the other end, it is affected by the heat generated by the stator core and stator coils, causing the cooling air temperature to gradually rise. This results in uneven cooling of each section of the stator core and low cooling efficiency. Summary of the Invention

[0008] The purpose of this invention is to overcome the aforementioned problems and propose a stator frame for high-altitude long iron core permanent magnet wind turbine with stator partition cooling, so as to achieve effective cooling of direct-drive wind turbines in plateau regions.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine is characterized by comprising: a first space, a second space, a third space, a non-drive end air outlet space, a fifth space, a drive end air outlet space, a first pressure equalization chamber, a second pressure equalization chamber, a third pressure equalization chamber, an air inlet chamber, a first air outlet chamber, and a second air outlet chamber within the stator frame; and a first ventilation duct, a second ventilation duct, and a third ventilation duct for allowing cooling air to enter the frame and an air outlet duct for discharging cooling air.

[0011] First zone cooling path: The first ventilation duct is connected to the first pressure equalization chamber, the first pressure equalization chamber is connected to the non-drive end air outlet space, and the non-drive end air outlet space is connected to the fifth space.

[0012] Second zone cooling path: The second ventilation duct connects to the third pressure equalization chamber, the third pressure equalization chamber connects to the drive end air outlet space, the drive end air outlet space connects to the third space, and the third space connects to the fifth space;

[0013] The third cooling path is as follows: the third ventilation duct connects to the second equalizing chamber, the second equalizing chamber connects to the air inlet chamber, the air inlet chamber connects to the first air outlet chamber and the second air outlet chamber; the first air outlet chamber connects to the first space, the first space connects to the second space, the second space connects to the fifth space; the second air outlet chamber connects to the second space, the second space connects to the fifth space.

[0014] The fifth space connects to the air outlet duct.

[0015] The first space is formed by a support ring plate, a sixth ring plate, and a conical ring plate; the second space is formed by a support ring plate, a fifth ring plate, a seventh ring plate, and an eighth ring plate; the third space is formed by a support ring plate, a fifth ring plate, an eighth ring plate, and a ninth ring plate; the fifth space is formed by an eleventh ring plate, a fifth ring plate, a twelfth ring plate, and a thirteenth ring plate. The support ring plates located within the first and second spaces have circumferentially distributed first ventilation holes connecting the first and second spaces; the eighth ventilation hole on the support ring plate connects the drive end air outlet space and the third space; and the tenth ventilation hole on the fifth ring plate connects the... The third and fifth spaces are connected by an eleventh ventilation hole on the fifth ring plate, and a twelfth ventilation hole on the eleventh ring plate, which connects the non-drive end air outlet space and the fifth space. The second ventilation hole on the support ring plate is spaced apart, connecting the first cavity and the second cavity. The ninth ventilation hole is evenly distributed on the circumference of the fourth ring plate, connecting the second cavity and the second equalizing cavity. The third and fourth ventilation holes are spaced apart on the circumference of the sixth and seventh ring plates, respectively, and are only distributed at the circumferential positions corresponding to the air outlet cavity, so that the first air outlet cavity is connected to the first space and the second air outlet cavity is connected to the second space.

[0016] The air inlet cavity is divided into a first cavity and a second cavity. The first cavity is formed by a second ring plate, a support ring plate, a sixth ring plate, and several stiffening plates surrounding the stator base on the circumference. The second cavity is formed by a support ring plate, a seventh ring plate, a fourth ring plate, and several stiffening plates, which are evenly distributed on the circumference in the same number as the first cavity. The positions of the first cavity and the second cavity on the circumference correspond to each other and are separated by the support ring plate. The air outlet cavity is divided into a first air outlet cavity and a second air outlet cavity by the support ring plate. The air inlet cavity and the air outlet cavity are evenly spaced on the circumference.

[0017] The first equalizing chamber is formed by the fifth ring plate, the fourth ring plate and the tenth ring plate; the second equalizing chamber is formed by the fifth ring plate, the fourth ring plate, the seventh ring plate and the tenth ring plate; and the third equalizing chamber is formed by the first ring plate, the second ring plate and the conical ring plate. The first equalizing chamber and the second equalizing chamber are located between the fourth ring plate and the fifth ring plate.

[0018] The first ventilation duct passes through the support ring plate and has a fifth ventilation hole on the circumference, connecting to the first pressure equalization chamber; the third ventilation duct passes through the support ring plate and has a sixth ventilation hole on the circumference, connecting to the second pressure equalization chamber; the second ventilation duct passes through a seventh ventilation hole evenly opened on the second ring plate, the support ring plate, and the fourth ring plate, connecting to the third pressure equalization chamber.

[0019] The stator base is provided with a first ring plate, a second ring plate, a support ring plate, a fourth ring plate, and a fifth ring plate, and several axial stiffeners in sequence on its outer periphery. An inclined conical ring plate is connected between the first ring plate and the support ring plate. The end of the second ring plate is connected to the conical ring plate. A sixth ring plate is provided between the second ring plate and the support ring plate. A seventh ring plate, an eighth ring plate, and a ninth ring plate are provided vertically between the support ring plate and the fifth ring plate. The seventh ring plate is connected to the end of the fourth ring plate. An eleventh ring plate is provided between the non-drive end air outlet space 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 non-drive end air outlet space.

[0020] The radial dimensions of the air inlet and air outlet are not less than 100 mm.

[0021] The axial length of the air inlet and air outlet is set to be 1500 mm or more.

[0022] The number of the first ventilation hole is consistent with the number of the third or fourth ventilation hole.

[0023] The third and fourth ventilation holes are located at the same position on the circumference.

[0024] The first ventilation duct, the second ventilation duct, and the third ventilation duct are combined to form an air inlet.

[0025] The air inlet and outlet ducts are evenly distributed along the circumference.

[0026] The number of air inlets and air outlets is 6-8.

[0027] The eleventh ring plate is fixedly connected to a sealing mounting ring plate.

[0028] The sealing mounting ring plate has annular grooves machined on both the inner end face and the outer circle of the outer end face.

[0029] A central flange is fixedly connected to the lower end of the support ring plate.

[0030] The beneficial effects of using the present invention are as follows:

[0031] I. Compared with the prior art, the present invention can greatly reduce the difference in air volume in the stator core ventilation duct, thereby ensuring that each core section and the stator coil in each core section receive sufficient and uniform air cooling, thus improving the cooling effect.

[0032] Second, the present invention provides a cooling air path that cools the stator linear section near the non-driving end, the non-driving end of the stator coil, and the copper ring. The air path is relatively short, which can fully ensure the cooling of the non-driving end of the stator coil and the copper ring, thus improving the cooling efficiency.

[0033] Third, another cooling air path of the present invention is for the stator linear segment near the drive end of the stator coil drive end. The cooling air path is simple and less affected by the heat dissipated by the stator core, which can fully ensure the cooling of the stator drive end and improve the cooling efficiency.

[0034] Fourth, the radial dimensions of the air inlet and outlet cavities of the third cooling air path in the middle of the stator are larger than those of the present invention, which can reduce wind resistance. Furthermore, the air inlet and outlet cavities are arranged in a circumferentially uniform interval, which increases the air volume while ensuring the heat dissipation area, effectively improving the cooling effect and significantly reducing the stator temperature difference.

[0035] Fifth, the air inlet and outlet pipes of this invention are evenly distributed along the circumference, with a quantity of 6-8, which facilitates more uniform flow of cooling air around the circumference, helps to reduce the circumferential temperature difference, and ensures the ventilation and cooling effect.

[0036] Sixth, by using three air ducts with different directions to improve the cooling effect, reduce the stator temperature difference, and improve the efficiency of cooling air utilization, the system can adapt to the unfavorable conditions of lower air density in high-altitude areas.

[0037] Cooling air diagram

[0038] Figure 1 This is a longitudinal sectional view of the stator frame of the present invention;

[0039] Figure 2 For the present invention Figure 1 Cross section view of stator frame AA;

[0040] Figure 3 For the present invention Figure 1 Cross section of stator frame BB;

[0041] Figure 4 For the present invention Figure 1 Cross section of stator frame (CC);

[0042] Figure 5 For the present invention Figure 1 Cross section view of the stator frame (DD);

[0043] Figure 6 This is a schematic diagram of the stator frame of the present invention;

[0044] Figure 7 This is a schematic cross-sectional view of the stator frame of the present invention.

[0045] The following are labeled in the diagram: 1. Center flange, 2. First ventilation duct, 3. Second ventilation duct, 4. Third ventilation duct, 5. Eleventh ring plate, 6. Sealing installation ring plate, 7. Exhaust duct, 8. Ninth ring plate, 9. First ring plate, 10. Support 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. Twelfth ring plate, 20. Thirteenth ring plate, 21. Tenth ring plate, 22. Ninth ventilation hole, 23. Second ventilation hole. 24. First equalizing chamber, 25. Second equalizing chamber, 26. Third equalizing chamber, 27. Air inlet chamber, 28. First air outlet chamber, 29. First space, 30. Second space, 31. Third space, 32. Drive end air outlet space, 33. Non-drive end air outlet space, 34. Third ventilation hole, 35. Fourth ventilation hole, 36. First ventilation hole, 37. Eighth ventilation hole, 38. Tenth ventilation hole, 39. Eleventh ventilation hole, 40. Fifth space, 41. Twelfth ventilation hole, 42. Second air outlet chamber, 43. First cavity, 44. Second cavity.

[0046] Example 1

[0047] This embodiment, in conjunction with the accompanying drawings, further illustrates the structure and principle of the present invention:

[0048] A stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine includes a first space 29, a second space 30, a third space 31, a non-drive end air outlet space 33, a fifth space 40, a drive end air outlet space 32, a first pressure equalization chamber 24, a second pressure equalization chamber 25, a third pressure equalization chamber 26, an air inlet chamber 27, a first air outlet chamber 28, and a second air outlet chamber 42 within the stator frame; and a first ventilation duct 2, a second ventilation duct 3, and a third ventilation duct 4 for entering cooling air and an air outlet duct 7 for discharging cooling air.

[0049] First zone cooling path: First ventilation duct 2 connects to first pressure equalization chamber 24, first pressure equalization chamber 24 connects to non-drive end air outlet space 33, non-drive end air outlet space 33 connects to fifth space 40;

[0050] Second zone cooling path: Second ventilation duct 3 connects to third pressure equalization chamber 26, third pressure equalization chamber 26 connects to drive end air outlet space 32, drive end air outlet space 32 connects to third space 31, third space 31 connects to fifth space 40.

[0051] The third cooling path is as follows: the third ventilation duct 4 connects to the second equalizing chamber 25, the second equalizing chamber 25 connects to the air inlet chamber 27, the air inlet chamber 27 connects to the first air outlet chamber 28 and the second air outlet chamber 42; the first air outlet chamber 28 connects to the first space 29, the first space 29 connects to the second space 30, the second space 30 connects to the fifth space 40; the second air outlet chamber 42 connects to the second space 30, the second space 30 connects to the fifth space 40.

[0052] Fifth Space 40 connects to air outlet duct 7.

[0053] The first space 29 is formed by the support ring plate 10, the sixth ring plate 14, and the conical ring plate 17; the second space 30 is formed by the support ring plate 10, the fifth ring plate 11, the seventh ring plate 16, and the eighth ring plate 18; the third space 31 is formed by the support ring plate 10, the fifth ring plate 11, the eighth ring plate 18, and the ninth ring plate 8; and the fifth space 40 is formed by the eleventh ring plate 5, the fifth ring plate 11, the twelfth ring plate 19, and the thirteenth ring plate 20. The support ring plate 10, located within the first space 29 and the second space 30, has circumferentially distributed first ventilation holes 36 connecting the first space 29 and the second space 30. The eighth ventilation hole 37 on the support ring plate 10 connects the drive end air outlet space 32 and the third space 31. The fifth ring plate 11 has a tenth ventilation hole 36. 8 connects the second space 30 and the fifth space 40. The eleventh ventilation hole 39 on the fifth ring plate 11 connects the third space 31 and the fifth space 40. The twelfth ventilation hole 41 on the eleventh ring plate 5 connects the non-drive end air outlet space 33 and the fifth space 40. The second ventilation hole 23 on the support ring plate 10 is spaced apart to connect the first cavity 43 and the second cavity 44. The ninth ventilation hole 22 is evenly distributed on the circumference of the fourth ring plate 15 to connect the second cavity 44 and the second equalizing cavity 25. The third ventilation hole 34 and the fourth ventilation hole 35 are spaced apart on the sixth ring plate 14 and the seventh ring plate 16 respectively along the circumference, and are only distributed at the circumferential position corresponding to the air outlet cavity, so that the first air outlet cavity 28 is connected to the first space 29 and the second air outlet cavity 42 is connected to the second space 30.

[0054] The air inlet cavity 27 is divided into a first cavity 43 and a second cavity 44. The first cavity 43 is formed by a second ring plate 13, a support ring plate 10, a sixth ring plate 14 and several stiffening plates 12 on the circumference to form the outer periphery of the stator base. The second cavity 44 is formed by a support ring plate 10, a seventh ring plate 16, a fourth ring plate 15 and several stiffening plates 12, and is evenly distributed on the circumference in the same number as the first cavity 43. The positions of the first cavity 43 and the second cavity 44 on the circumference correspond and are separated from each other by the support ring plate 10. The air outlet cavity is divided into a first air outlet cavity 28 and a second air outlet cavity 42 by the support ring plate 10. The air inlet cavity 27 and the air outlet cavity are evenly spaced on the circumference.

[0055] The first equalizing chamber 24 is formed by the fifth ring plate 11, the fourth ring plate 15 and the tenth ring plate 21; the second equalizing chamber 25 is formed by the fifth ring plate 11, the fourth ring plate 15, the seventh ring plate 16 and the tenth ring plate 21; and the third equalizing chamber 26 is formed by the first ring plate 9, the second ring plate 13 and the conical ring plate 17. The first equalizing chamber 24 and the second equalizing chamber 25 are disposed between the fourth ring plate 15 and the fifth ring plate 11.

[0056] The first ventilation duct 2 passes through the support ring plate 10 and has a fifth ventilation hole on its circumference, connecting to the first pressure equalization chamber 24; the third ventilation duct 4 passes through the support ring plate 10 and has a sixth ventilation hole on its circumference, connecting to the second pressure equalization chamber 25; the second ventilation duct 3 passes through a seventh ventilation hole evenly opened on the second ring plate 13, the support ring plate 10 and the fourth ring plate 15, connecting to the third pressure equalization chamber 26.

[0057] The stator base is provided with a first ring plate 9, a second ring plate 13, a support ring plate 10, a fourth ring plate 15, a fifth ring plate 11, and several axial stiffeners 12 in sequence on its outer periphery. An inclined conical ring plate 17 is connected between the first ring plate 9 and the support ring plate 10. The end of the second ring plate 13 is connected to the conical ring plate 17. A sixth ring plate 14 is provided between the second ring plate 13 and the support ring plate 10. A seventh ring plate 16, an eighth ring plate 18, and a ninth ring plate 8 are provided between the support ring plate 10 and the fifth ring plate 11 in sequence, and the seventh ring plate 16 is connected to the end of the fourth ring plate 15. An eleventh ring plate 5 is provided between the non-drive end air outlet space 33 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-drive end air outlet space 33.

[0058] The radial dimensions of the air inlet chamber 27 and the air outlet chamber are not less than 100 mm.

[0059] The axial length of the air inlet chamber 27 and the air outlet chamber is set to be more than 1500 mm.

[0060] The number of the first ventilation hole 36 is consistent with the number of the third ventilation hole 34 or the fourth ventilation hole 35.

[0061] The third ventilation hole 34 and the fourth ventilation hole 35 are located at the same position on the circumference.

[0062] The first ventilation duct 2, the second ventilation duct 3, and the third ventilation duct 4 are combined to form an air inlet.

[0063] The air inlet and air outlet 7 are evenly distributed along the circumference.

[0064] The number of air inlets and air outlets is 6-8.

[0065] The eleventh ring plate 5 is fixedly connected to a sealing mounting ring plate 6.

[0066] The sealing mounting ring plate 6 has annular grooves machined on both the inner end face and the outer circle of the outer end face.

[0067] The lower end of the support ring plate 10 is fixedly connected to the central flange 1.

[0068] like Figure 1-7 As shown, cooling air enters the first equalizing chamber 24, which is composed of the fifth ring plate 11, the fourth ring plate 15 and the tenth ring plate 21, from the first ventilation duct 2. It then disperses in the circumferential direction, passes through the radial ventilation channels of the iron core distributed on the circumference, enters the air gap and enters the non-drive end air outlet space 33, and then flows from the twelfth ventilation hole 41 on the eleventh ring plate 5 to the fifth space 40, which is composed of the eleventh ring plate 5, the fifth ring plate 11, the twelfth ring plate 19 and the thirteenth ring plate 20.

[0069] Cooling air enters the third equalizing chamber 26, which is composed of the first ring plate 9, the second ring plate 13 and the conical ring plate 17, from the second ventilation. It then disperses in the circumferential direction, passes through the radial ventilation channels of the iron core distributed on the circumference to the air gap, enters the exhaust space 32 at the drive end, passes through the eighth ventilation hole 37 evenly distributed on the support ring plate 10 and enters the third space 31, which is composed of the ninth ring plate 8, the support ring plate 10, the fifth ring plate 11 and the eighth ring plate 18. It then flows to the fifth space 40 after passing through the eleventh ventilation hole 39 evenly distributed on the fifth ring plate 11.

[0070] Cooling air enters the second equalizing chamber 25, composed of the fifth ring plate 11, the fourth ring plate 15, the seventh ring plate 16, and the tenth ring plate 21, from the third ventilation duct 4. It then disperses circumferentially, passing through the ninth ventilation hole 22 evenly distributed on the fourth ring plate 15 and the second ventilation hole 23 on the supporting ring plate 10, into the air inlet chamber 27, which is at least 100 mm long and at least 1500 mm in length. From there, it passes through the radial ventilation channels of the core distributed on the corresponding circumference of the air inlet chamber 27 to the air gap, and from the air gap, through the radial ventilation channels of the core, it enters the outlet chamber, which is at least 100 mm long and at least 1500 mm in length. The air chamber 28 passes through the radial ventilation channels of the iron core distributed on the corresponding circumference of the air outlet 28, through the third ventilation hole 34 on the sixth ring plate 14 and the ventilation hole 35 on the seventh ring plate 16, and into the first space 29 composed of the support ring plate 10, the sixth ring plate 14 and the conical ring plate 17, and the second space 30 composed of the support ring plate 10, the fifth ring plate 11, the seventh ring plate 16 and the eighth ring plate 18. The cooling air of the first space 29 enters the second space 30 through the first ventilation hole 36 on the support ring plate 10, and finally enters the fifth space 40 through the tenth ventilation hole 38 on the fifth ring plate 11.

[0071] The three streams of air converge at the fifth space 40 and are discharged through the air outlet duct 7.

[0072] Example 2

[0073] The first ventilation duct 2, the second ventilation duct 3, and the third ventilation duct are combined to form an air inlet duct. The air inlet duct and the air outlet duct 7 are evenly distributed along the circumference, with a quantity of 6-8. A blower is installed at the air inlet duct to facilitate more uniform flow of cooling air around the circumference, which helps to ensure the ventilation and cooling effect, reduce the circumferential air temperature difference, and ensure the ventilation and cooling effect.

[0074] The radial dimensions of the air inlet cavity 27, the first air outlet cavity 28, and the second air outlet cavity 42 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 42 reduce air resistance, ensuring sufficient cooling air in the air inlet cavity 27 to cool the stator core. After heat exchange between the cooling air and the stator core, the hot air can flow smoothly out of the first air outlet cavity 28 and the second air outlet cavity 42. Secondly, the large radial dimension of the air inlet cavity 27 reduces air resistance, allowing for a sufficient amount of cooling air to enter. The cooling air flows from the corresponding air inlet cavity to the radial ventilation channel and air gap, and then through the radial ventilation channel to the corresponding air outlet cavity. This ensures a sufficiently large contact area between the cooling air and the stator core in the middle part of the stator, facilitating contact during cooling. The longer the interval, the longer the heat exchange time, resulting in higher heat exchange efficiency and a significant axial temperature difference cooling effect. Thirdly, when the cooling air flows from one end of the air inlet cavity 27 to the other end, it will be affected by the heat dissipated by the stator core and stator coil, causing the temperature of the cooling air to rise partially. However, since the cooling air entering the air inlet cavity 27 is sufficient, the difference in air volume in the radial ventilation channel is reduced, resulting in a longer contact time between the cooling air and the stator core, a longer heat exchange time, and a higher heat exchange effect. This allows each section of the stator core and the stator coil located at each section of the stator core to receive more sufficient cooling air, improving the cooling effect and resulting in a significant temperature reduction effect.

[0075] The radial dimension of the first equalizing chamber 24 is not less than 150 mm; the radial dimension of the second equalizing chamber 25 is not less than 100 mm; and the radial dimension of the third equalizing chamber 26 is not less than 200 mm.

[0076] The number of fourth ventilation holes 35 is the same as that of the second ventilation holes 23 or the third ventilation holes 34, and their positions on the circumference are the same as those of the second ventilation holes 23 and the third ventilation holes 34.

Claims

1. A stator frame for stator partition cooling of a high-altitude long-core permanent magnet wind turbine, characterized in that: Includes a first space (29), a second space (30), a third space (31), a non-drive end air outlet space (33), a fifth space (40), a drive end air outlet space (32), a first equalizing chamber (24), a second equalizing chamber (25), a third equalizing chamber (26), an air inlet chamber (27), a first air outlet chamber (28), and a second air outlet chamber (42) within the stator frame; a first ventilation duct (2), a second ventilation duct (3), and a third ventilation duct (4) for allowing cooling air to enter the frame and an air outlet duct (7) for discharging cooling air; First zone cooling path: First ventilation duct (2) connects to first equalizing chamber (24), first equalizing chamber (24) connects to non-drive end air outlet space (33), non-drive end air outlet space (33) connects to fifth space (40); Second zone cooling path: Second ventilation duct (3) connects to third equal pressure chamber (26), third equal pressure chamber (26) connects to drive end air outlet space (32), drive end air outlet space (32) connects to third space (31), third space (31) connects to fifth space (40); The third cooling path is as follows: the third ventilation duct (4) connects to the second equalizing chamber (25), the second equalizing chamber (25) connects to the air inlet chamber (27), the air inlet chamber (27) connects to the first air outlet chamber (28) and the second air outlet chamber (42); the first air outlet chamber (28) connects to the first space (29), the first space (29) connects to the second space (30), the second space (30) connects to the fifth space (40); the second air outlet chamber (42) connects to the second space (30), the second space (30) connects to the fifth space (40); The fifth space (40) is connected to the air outlet duct (7); The first space (29) is formed by the support ring plate (10), the sixth ring plate (14) and the conical ring plate (17). The second space (30) is formed by the support ring plate (10), the fifth ring plate (11), the seventh ring plate (16) and the eighth ring plate (18). The third space (31) is formed by the support ring plate (10), the fifth ring plate (11), the eighth ring plate (18) and the ninth ring plate (8). The fifth space (40) is formed by the eleventh ring plate (5), the fifth ring plate (11), the twelfth ring plate (19) and the thirteenth ring plate (20). The support ring plate (10) located in the first space (29) and the second space (30) is provided with a first ventilation hole (36) arranged in a circle to connect the first space (29) and the second space (30). The eighth ventilation hole (37) provided on the support ring plate (10) connects the drive end air outlet space (32) and the third space (31). The fifth ring plate (11) is provided with a tenth ventilation hole. The air hole (38) connects the second space (30) and the fifth space (40). The eleventh ventilation hole (39) on the fifth ring plate (11) connects the third space (31) and the fifth space (40). The twelfth ventilation hole (41) on the eleventh ring plate (5) connects the non-drive end air outlet space (33) and the fifth space (40). The second ventilation hole (23) on the support ring plate (10) is spaced apart to connect the first cavity (43) and the second cavity (44). The ninth ventilation hole (22) on the circumference of the fourth ring plate (15) is evenly arranged to connect the second cavity (44) and the second equalizing cavity (25). The third ventilation hole (34) and the fourth ventilation hole (35) on the sixth ring plate (14) and the seventh ring plate (16) are spaced apart along the circumference, respectively, and are only distributed at the circumferential position corresponding to the air outlet cavity, so that the first air outlet cavity (28) is connected to the first space (29) and the second air outlet cavity (42) is connected to the second space (30).

2. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine as described in claim 1, characterized in that: The air inlet cavity (27) is divided into a first cavity (43) and a second cavity (44). The first cavity (43) is formed by a second ring plate (13), a support ring plate (10), a sixth ring plate (14) and several stiffeners (12) on the circumference to form the outer periphery of the stator base. The second cavity (44) is formed by a support ring plate (10), a seventh ring plate (16), a fourth ring plate (15) and several stiffeners (12), and is evenly distributed on the circumference in the same number as the first cavity. The positions of the first cavity (43) and the second cavity (44) on the circumference correspond to each other and are separated by the support ring plate (10). The air outlet cavity is divided into a first air outlet cavity (28) and a second air outlet cavity (42) by the support ring plate (10). The air inlet cavity (27) and the air outlet cavity are evenly spaced on the circumference.

3. The stator frame for stator partition cooling of a high-altitude long-core permanent magnet wind turbine as described in claim 1, characterized in that: The first equalizing cavity (24) is formed by the fifth ring plate (11), the fourth ring plate (15) and the tenth ring plate (21), the second equalizing cavity (25) is formed by the fifth ring plate (11), the fourth ring plate (15), the seventh ring plate (16) and the tenth ring plate (21), and the third equalizing cavity (26) is formed by the first ring plate (9), the second ring plate (13) and the conical ring plate (17); the first equalizing cavity (24) and the second equalizing cavity (25) are located between the fourth ring plate (15) and the fifth ring plate (11).

4. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine as described in claim 1, characterized in that: The first ventilation duct (2) passes through the support ring plate (10) and has a fifth ventilation hole on the circumference to connect to the first equalizing chamber (24); the third ventilation duct (4) passes through the support ring plate (10) and has a sixth ventilation hole on the circumference to connect to the second equalizing chamber (25); the second ventilation duct (3) passes through the seventh ventilation hole evenly opened on the second ring plate (13), the support ring plate (10) and the fourth ring plate (15) to connect to the third equalizing chamber (26).

5. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine as described in claim 1, characterized in that: The stator base is provided with a first ring plate (9), a second ring plate (13), a support ring plate (10), a fourth ring plate (15), and a fifth ring plate (11) and several axial stiffeners (12) in sequence on its outer periphery. An inclined conical ring plate (17) is connected between the first ring plate (9) and the support ring plate (10). The end of the second ring plate (13) is connected to the conical ring plate (17). A sixth ring plate (14) is provided between the second ring plate (13) and the support ring plate (10). A seventh ring plate (16), an eighth ring plate (18), and a ninth ring plate (8) are provided between the support ring plate (10) and the fifth ring plate (11) in sequence. The seventh ring plate (16) is connected to the end of the fourth ring plate (15). An eleventh ring plate (5) is provided between the non-drive end air outlet space (33) 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-drive end air outlet space (33).

6. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine as described in claim 3, characterized in that: The radial dimensions of the air inlet and air outlet are not less than 100 mm.

7. A stator frame for stator partition cooling of a high-altitude long-core permanent magnet wind turbine as described in claim 3 or 6, characterized in that: The axial length of the air inlet and air outlet is set to be 1500 mm or more.

8. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine according to claim 6, characterized in that: The number of the first ventilation hole (36) is consistent with the number of the third ventilation hole (34) or the fourth ventilation hole (35).

9. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine as described in claim 6, characterized in that: The third ventilation hole (34) and the fourth ventilation hole (35) are in the same position on the circumference.

10. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine according to claim 1, characterized in that: The first ventilation duct (2), the second ventilation duct (3) and the third ventilation duct (4) are combined to form an air inlet.

11. A stator frame for stator partition cooling of a high-altitude long-core permanent magnet wind turbine according to any one of claims 1 or 10, characterized in that: The air inlet and air outlet duct (7) are evenly distributed along the circumference.

12. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine according to claim 11, characterized in that: The number of air inlets and air outlets (7) is 6-8.

13. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine according to claim 6, characterized in that: The eleventh ring plate (5) is fixedly connected to a sealing mounting ring plate (6).

14. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine according to claim 13, characterized in that: The sealing mounting ring plate (6) has annular grooves machined on both the inner end face and the outer circle of the outer end face.

15. The stator frame for stator partition cooling of a high-altitude long iron core permanent magnet wind turbine according to claim 1, characterized in that: The lower end of the support ring plate (10) is fixedly connected to the center flange (1).

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