Stator structure of a wind turbine and wind turbine comprising the same

Abstract

The application discloses a stator structure of a wind driven generator and a wind driven generator comprising the same, which comprises an inlet for cooling medium to flow in, an outlet for cooling medium to flow out, a stator core, and a cooling channel at a radial outer circumferential surface of the stator core, wherein the inlet is communicated with the cooling channel; the stator structure further comprises a coil arranged on the stator core, the coil has a first radial surface and a second radial surface, the first radial surface is close to and exposed from the radial outer circumferential surface of the stator core, and the second radial surface is close to and exposed from a radial inner circumferential surface of the stator core. The cooling medium and cooling air flow can directly exchange heat with the first radial surface and the second radial surface of the coil at the same time, the heat exchange path is shortened, the effective heat exchange area of the cooling medium and the coil is increased, and therefore the cooling efficiency of the generator is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a stator structure of a wind power generator and a wind power generator comprising the same. BACKGROUND

[0002] The air cooling method is often used in the internal structure of a motor, especially a large motor or generator, such as a wind power generator. In this method, low-temperature air is forced to flow into the motor, and the low-temperature air flows along the designed internal air path to take away the heat generated by the internal loss sources, such as the winding, the core, the magnetic steel, etc., and then the heat is discharged outside the motor. Generally, there are two forms of internal air path in the motor. One is that the cold air is introduced from one side of the axial direction of the motor, and then the cold air flows along the air gap between the stator and the rotor to the other side of the axial direction, and then the hot air is discharged from the other side of the axial direction of the motor to take away the heat. The other is that the cold air is introduced from both sides of the axial direction of the motor, and then the cold air flows along the air gap between the stator and the rotor to the middle of the motor, and then the hot air is discharged radially through the radial air slots arranged in the stator core after heat exchange.

[0003] In the prior art, a large wind power generator, especially in the application field with high rotating speed (tens of revolutions to thousands of revolutions), often adopts a permanent magnet synchronous generator. Due to the large size of the motor, in order to reduce the frequency and the loss as much as possible, the stator of the motor often adopts a distributed winding structure, that is, two coil edges of a single coil are arranged in two non-adjacent stator slots in the circumferential direction. In addition, the cold air is introduced from the axial end side of the motor, and then the cold air flows along the internal air gap between the stator and the rotor to take away the internal heat, or a hybrid cooling structure is adopted, that is, the air and the liquid are used simultaneously to cool the generator. There are three main problems in the motor structure in the prior art. First, the copper loss generated by the winding of the generator often accounts for more than half of the total loss of the motor. The copper loss generated at the end of the winding can only be exchanged by the radial flow of the cooling air, and the heat exchange area is limited. The copper loss heat generated by the effective core section of the winding needs to be conducted to the stator core first, and then the heat is exchanged by the cooling air. The heat exchange path is long, and the overall heat exchange efficiency is low. Second, when the hybrid cooling structure of liquid cooling plus air cooling is adopted, the liquid cooling part is arranged between the stator core yoke and the stator core of the generator. Since the cooling liquid first exchanges heat with the stator core, and then indirectly exchanges heat with the coil, the heat exchange path is long, and the cooling efficiency is low. Third, the large wind power generator often has a large outer diameter and a short shaft length. The distributed winding type of the stator will cause the length of the coil end ineffective winding to be too long, the loss to increase, and the efficiency of the motor to decrease. In addition, due to the large axial space occupied by the end winding of the motor, the weight, volume and cost of the related structural parts and the whole motor are greatly increased. The above problems will cause the overall heat exchange efficiency of the motor to be low, and the local hot spot of the winding to be prone to occur, which reduces the power density and the reliability of the motor. SUMMARY

[0004] The technical problem solved by the present application is to overcome the low cooling efficiency of the wind power generator in the prior art, and provide a stator structure of a wind power generator and a wind power generator comprising the same.

[0005] The present application solves the above technical problem by the following technical scheme:

[0006] A stator structure of a wind power generator comprises:

[0007] an inlet for flowing in of a cooling medium;

[0008] an outlet for flowing out of the cooling medium;

[0009] a stator core;

[0010] a cooling channel located at a radial outer circumferential surface of the stator core, the inlet being in communication with the cooling channel;

[0011] characterized in that the stator structure further comprises a coil, the coil being arranged on the stator core, the coil having a first radial surface and a second radial surface, the first radial surface being close to and exposed from the radial outer circumferential surface of the stator core, and the second radial surface being close to and exposed from a radial inner circumferential surface of the stator core.

[0012] The cooling medium can directly exchange heat with the first radial surface of the coil through the cooling channel, and the heat exchange path is shorter compared with the prior art in which the cooling medium exchanges heat indirectly with the stator core and the coil through the cooling channel. The second radial surface of the coil is exposed from the inner circumferential surface of the stator core, and the cooling gas can flow to the gap between the stator core and the rotor to contact and exchange heat with the second radial surface of the coil, i.e. the cooling medium and the cooling gas flow can simultaneously directly exchange heat with the first radial surface and the second radial surface of the coil, thereby increasing the effective heat exchange area of the cooling medium and the coil, and improving the cooling efficiency of the generator.

[0013] Preferably, the coil comprises a first coil side and a second coil side, the first coil side and the second coil side being arranged along the radial direction of the stator structure, the maximum outer diameter of the first coil side being greater than the maximum outer diameter of the second coil side, the first radial surface being the outer circumferential surface of the first coil side, the second radial surface being the inner circumferential surface of the second coil side, and the first coil side and the second coil side being connected.

[0014] In the scheme, the first coil side and the second coil side are directly connected, and the end winding length thereof is approximately equal to the yoke thickness of the stator, while the end length of the conventional distributed winding is approximately equal to the rotor pole pitch, so that the end winding length of the scheme is shorter, the axial length of the generator can be greatly shortened, and the volume and weight of the generator are reduced. In addition, the winding end loss is reduced, the local heat concentration of the generator is reduced, the cooling efficiency is improved, and thus the power density and reliability of the generator are improved.

[0015] Preferably, the stator structure comprises a first coil slot and a second coil slot, the first coil slot is arranged on the radial outer circumferential surface of the stator core, and the second coil slot is arranged on the radial inner circumferential surface of the stator core. The first coil side is arranged in the first coil slot, and the second coil side is arranged in the second coil slot.

[0016] In the scheme, the coil slot facilitates the installation of the first coil side and the second coil side, and the stability after installation is good.

[0017] Preferably, the inlet and the outlet are arranged in opposite positions along the axial direction of the stator structure.

[0018] In the scheme, the cooling medium is prevented from flowing from the inlet to the outlet along the axial direction of the stator structure, so that the cooling medium flows more fully in the generator, and thus the heat exchange effect is improved.

[0019] Preferably, the cooling medium is a gas, and the first radial surface is in communication with the cooling channel, so that the cooling medium can contact the first radial surface through the cooling channel.

[0020] In the scheme, the cooling medium directly contacts the coil surface for cooling, and the cooling efficiency is higher than that of the indirect heat exchange between the cooling medium and the coil through the stator core.

[0021] Preferably, the inlet comprises a first inlet and a second inlet, and the first inlet and the second inlet are arranged in opposite positions along the axial direction of the stator structure.

[0022] In the scheme, the first inlet and the second inlet arranged in opposite positions enable the generator to be bidirectionally ventilated along the axial direction of the stator structure. The external low-temperature cooling gas enters the interior of the generator from both ends along the axial direction through the first inlet and the second inlet, flows along the air gap between the stator structure and the rotor, and then flows to the outlet through the gap between the coils. After the two streams of gas converge in the interior of the generator, a disturbance effect is generated, so that the cooling gas contacts the coil surface more fully, and the heat exchange effect is better.

[0023] Preferably, the cooling medium is a liquid, and the first radial surface is in contact with the side wall of the cooling channel.

[0024] In the scheme, the side wall of the cooling channel directly contacts the coil surface for heat exchange, and the cooling efficiency is higher.

[0025] Preferably, the stator structure comprises a casing, the cooling channel is arranged on the casing, the casing comprises a heat exchange surface for heat exchange, the heat exchange surface is a radial inner circumferential surface of the casing, and the first radial surface is in contact with the heat exchange surface.

[0026] In the scheme, the cooling channel is arranged conveniently, and the defect of strength reduction of the stator core caused by arranging the cooling channel on the stator core is avoided.

[0027] Preferably, the cooling channel is in a spiral or linear type.

[0028] In the scheme, the spiral or linear type of the cooling channel increases the heat exchange area and improves the heat exchange efficiency.

[0029] Preferably, the radial outer circumferential surface of the stator core is in contact with the heat exchange surface.

[0030] In the scheme, the heat exchange surface exchanges heat with the stator core and indirectly cools the coil, the heat exchange area of the coil is increased, and the heat exchange effect is improved.

[0031] Preferably, the casing further comprises a liquid cooling jacket, the liquid cooling jacket is made of an insulating material, the liquid cooling jacket is located between the cooling channel and the radial outer circumferential surface of the stator core, and the heat exchange surface is a radial inner circumferential surface of the liquid cooling jacket.

[0032] In the scheme, the liquid cooling jacket can insulate and seal the cooling channel, and the liquid cooling medium is prevented from contacting the coil.

[0033] Preferably, the inner diameter of the cooling channel is smaller than the inner diameter of the heat exchange surface.

[0034] In the scheme, the cooling channel overlaps the coil in the radial direction of the stator core, that is, the cooling channel is embedded in the stator core, the heat exchange area of the cooling channel, the stator core and the coil is increased, and the heat exchange efficiency is improved.

[0035] The application further discloses a wind driven generator comprising the stator structure.

[0036] Preferably, the cooling medium is gas, the wind driven generator further comprises a rotor, an air gap is arranged between the inner circumferential surface of the stator structure and the rotor, and the cooling medium can contact the second radial surface through the air gap.

[0037] The cooling gas is split after entering the inlet, the first cooling gas passes through the cooling channel and contacts the first radial surface of the coil to exchange heat, and the second cooling gas flows to the gap between the stator core and the rotor and contacts the second radial surface of the coil to exchange heat, that is, the cooling gas exchanges heat with the first radial surface and the second radial surface of the coil at the same time, the effective heat exchange area of the cooling gas and the coil is increased, and the temperature rise of the generator is reduced.

[0038] Preferably, the cooling medium is a liquid, and the wind power generator further comprises;

[0039] An inlet for the cooling gas to flow in;

[0040] An outlet for the cooling gas to flow out;

[0041] The rotor and the inner circumferential surface of the stator structure comprise a gap, and the cooling gas can contact the second radial surface through the gap.

[0042] In the scheme, the liquid cooling medium and the gas cooling medium exchange heat with the first radial surface and the second radial surface of the coil respectively, the effective heat exchange area of the cooling medium and the coil is increased, the cooling efficiency is improved, and the temperature rise of the generator is reduced.

[0043] Preferably, the inlet and the outlet are arranged in an axial direction of the stator structure.

[0044] After the cooling gas enters the generator from the inlet, the cooling gas flows in the gap in the generator to dissipate heat, avoiding the cooling gas flowing out along the axial direction of the stator structure directly, so that the cooling gas flows more fully in the generator, and the heat exchange effect is improved.

[0045] The positive progress effect of the application is that the cooling medium can directly exchange heat with the first radial surface of the coil through the cooling channel, and compared with the prior art in which the cooling medium exchanges heat with the stator core and the coil indirectly through the cooling channel, the heat exchange path is shorter, the second radial surface of the coil is exposed to the inner circumferential surface of the stator core, the cooling gas can flow to the gap between the stator core and the rotor to contact the second radial surface of the coil to exchange heat, that is, the cooling medium and the cooling gas flow can directly exchange heat with the first radial surface and the second radial surface of the coil at the same time, the effective heat exchange area of the cooling medium and the coil is increased, the cooling efficiency of the generator is improved, and the length of the end winding is reduced by connecting the first coil edge and the second coil edge, the axial length of the generator is shortened, the volume and weight of the motor are reduced, the end winding loss is reduced, the local heat concentration of the motor is reduced, the power density and the reliability of the motor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1Structure diagram of wind power generator in embodiment 1 of the present application.

[0047] Figure 2 Structure diagram of cooling gas flow path when unidirectional inlet is adopted in embodiment 1 of the present application.

[0048] Figure 3 Structure diagram of cooling gas flow path when bidirectional opposite inlet is adopted in embodiment 1 of the present application.

[0049] Figure 4 Structure diagram of wind power generator in embodiment 2 of the present application.

[0050] Figure 5 Structure diagram of cooling medium flow path of liquid-gas mixed cooling structure in embodiment 2 of the present application.

[0051] Figure 6 Structure diagram of wind power generator in embodiment 3 of the present application.

[0052] Figure 7 Structure diagram of wind power generator in embodiment 4 of the present application.

[0053] Explanation of reference numerals

[0054] Coil 1

[0055] First coil side 11

[0056] First radial surface 12

[0057] Second coil side 13

[0058] Second radial surface 14

[0059] Coil end 15

[0060] Stator core 2

[0061] Coil slot 21

[0062] First coil slot 211

[0063] First slot opening 212

[0064] Second coil slot 213

[0065] Second slot opening 214

[0066] Machine housing 3

[0067] Cooling passage 31

[0068] Heat exchange surface 32

[0069] Liquid cooling jacket 33

[0070] Inlet 34

[0071] first inlet 341

[0072] second inlet 342

[0073] outlet 35

[0074] air inlet 36

[0075] air outlet 37

[0076] rotor 4

[0077] rotor yoke 41

[0078] air gap 5 DETAILED DESCRIPTION

[0079] The present application will be further described by way of example but without intending to limit the application to the described examples.

[0080] Example 1

[0081] As Figures 1-2 shown, the present embodiment discloses a stator structure of a wind power generator, which comprises: an inlet 34 for flowing in of a cooling medium; an outlet 35 for flowing out of the cooling medium; a stator core 2; the stator structure further comprises: a cooling channel 31 located at a radial outer circumferential surface of the stator core 2, the inlet 34 being in communication with the cooling channel 31; a coil 1 arranged on the stator core 2, the coil 1 having a first radial surface 12 and a second radial surface 14, the first radial surface 12 being close to and exposed from a radial outer circumferential surface of the stator core 2, and the second radial surface 14 being close to and exposed from a radial inner circumferential surface of the stator core 2. Wherein, the first radial surface 12 is close to and exposed from the radial outer circumferential surface of the stator core 2, i.e. the first radial surface 12 is close to the radial outer circumferential surface of the stator core 2, and the first radial surface 12 is exposed from the radial outer circumferential surface of the stator core 2; the second radial surface 14 is close to and exposed from the radial inner circumferential surface of the stator core 2, i.e. the second radial surface 14 is close to the radial inner circumferential surface of the stator core 2, and the second radial surface 14 is exposed from the radial inner circumferential surface of the stator core 2.

[0082] In the present embodiment, the cooling medium is gas, the first radial surface 12 is in communication with the cooling channel 31, and the cooling medium can directly contact the first radial surface 12 through the cooling channel 31. Specifically, the stator structure in the present embodiment comprises a casing 3, and the cooling channel 31 is arranged on the casing 3. Of course, in other embodiments, the cooling channel 31 can also be arranged on the outer circumferential surface of the stator core 2. Arranging the cooling channel 31 on the casing 3 facilitates the arrangement of the cooling channel 31 and avoids the defect of strength reduction of the stator core 2 caused by arranging the cooling channel 31 on the stator core 2.

[0083] As Figure 1 shown, the embodiment also discloses a wind power generator, which comprises the stator structure and the rotor 4 as described above, and the air gap 5 between the inner circumferential surface of the stator structure and the rotor 4, wherein the rotor 4 further comprises the rotor yoke 41, which is located at the air gap 5, and the cooling medium can contact the second radial surface 14 through the air gap 5, and the cooling gas flows into the inlet 34 and is then divided into two streams, the first stream of cooling gas flows through the cooling channel 31 and contacts the first radial surface 12 of the coil 1 for heat exchange, and the second stream of cooling gas flows to the air gap 5 between the stator core 2 and the rotor 4 and contacts the second radial surface 14 of the coil 1 for heat exchange, that is, the cooling medium can directly exchange heat with the first radial surface 12 and the second radial surface 14 of the coil 1 at the same time, which shortens the heat exchange path, increases the effective heat exchange area of the cooling medium and the coil 1, and thus improves the cooling efficiency of the generator and reduces the temperature rise of the generator. The cooling medium directly contacts the surface of the coil 1 for cooling, and compared with the indirect heat exchange between the cooling medium and the coil 1 through the stator core 2, the heat exchange path is shorter and the cooling efficiency is higher.

[0084] Specifically, as Figure 2 shown, the arrows in the figure represent the flow direction of the cooling medium (cooling gas), the external low-temperature cooling gas enters the inside of the generator through the inlet 34, the cooling gas is divided into two streams, one stream of cooling gas flows along the air gap 5 between the stator and the rotor 4 and contacts the second radial surface 14 of the coil 1 for heat exchange, and the high-temperature cooling gas after heat exchange flows to the other side of the generator and is discharged through the outlet 35, and the other stream of cooling gas flows along the cooling channel 31 and contacts the first radial surface 12 of the coil 1 for heat exchange, and the high-temperature cooling gas after heat exchange flows to the other side of the generator and is discharged through the outlet 35.

[0085] As Figure 1 shown, the coil 1 comprises the first coil side 11 and the second coil side 13, the first coil side 11 and the second coil side 13 are arranged along the radial direction of the stator structure, the maximum outer diameter of the first coil side 11 is greater than that of the second coil side 13, the first radial surface 12 is the outer circumferential surface of the first coil side 11, the second radial surface 14 is the inner circumferential surface of the second coil side 13, and the first coil side 11 and the second coil side 13 are connected. In other embodiments, the coil 1 can also be provided with only a single coil side, that is, the coil 1 spans the stator core along the radial direction of the stator core.

[0086] Specifically, as Figure 1As shown, in this embodiment, the first coil side 11 and the second coil side 13 are connected through the coil end 15. The length of its end winding is approximately equal to the thickness of the stator yoke, while the end length of a conventional distributed winding is approximately equal to the rotor pole pitch. Therefore, the end winding length of this scheme is shorter. The direct connection between the first coil side 11 and the second coil side 13 can significantly shorten the axial length of the generator, reduce the generator's volume and weight, and reduce winding end losses, thereby reducing local heat concentration in the generator and improving the generator's power density and reliability.

[0087] like Figure 1 As shown, in this embodiment, the stator core 2 has two rows of coil slots 21. The slots located on the radial outer circumference of the stator core 2 are the first coil slots 211, and the slots located on the radial inner circumference of the stator core 2 are the second coil slots 213. The first coil edge 11 is disposed in the first coil slot 211, and the second coil edge 13 is disposed in the second coil slot 213. The coil slots 21 facilitate the installation of the first coil edge 11 and the second coil edge 13, and provide good stability after installation.

[0088] like Figure 1 As shown, specifically, the first radial surface 12 of the first coil edge 11 is in the first coil slot 211. The first coil slot 211 includes a first slot opening 212, and the first radial surface 12 is inside the first slot opening 212. Thus, the first radial surface 12 is exposed on the radial outer circumferential surface of the stator core 2. Therefore, the cooling medium on the outer circumferential surface of the stator core 2 can directly reach the first radial surface 12 through the first slot opening 212, so that the cooling medium and the first radial surface 12 can directly contact each other for heat exchange, thereby improving the heat exchange efficiency. Correspondingly, the second coil slot 213 includes a second slot opening 214, and the second radial surface 14 is inside the second slot opening 214. Thus, the second radial surface 14 is exposed on the radial inner circumferential surface of the stator core 2. Therefore, the cooling medium between the air gaps 5 can directly reach the second radial surface 14 through the second slot opening 214, so that the cooling medium and the second radial surface 14 can directly contact each other for heat exchange, thereby improving the heat exchange efficiency.

[0089] Specifically, in this embodiment, the coil 1 is wound in the first coil slot 211 and the second coil slot 213 along the axial direction of the stator core 2. The coil 1 includes a first coil side 11 and a second coil side 13 in the first coil slot 211 and the second coil slot 213, respectively. That is, the first coil side 11 is disposed in the first coil slot 211 and the second coil side 13 is disposed in the second coil slot 213. The first coil side 11 and the second coil side 13 are connected through the coil end 15.

[0090] In the embodiment, the area of the first notch 212 is larger than that of the first radial surface 12, and the first radial surface 12 is fully exposed at the first notch 212, and the area of the second notch 214 is larger than that of the second radial surface 14, and the second radial surface 14 is fully exposed at the second notch 214, of course, in other embodiments, the first radial surface 12 and the second radial surface 14 can be partially exposed at the first notch 212 and the second notch 214, respectively; in addition, in the embodiment, the first radial surface 12 does not protrude out of the first notch 212, that is, the first radial surface 12 is not higher than the radial outer circumferential surface of the stator core 2, which is to avoid increasing the ineffective winding section of the first coil side 11 and affecting the power generation efficiency, of course, in other embodiments, the first radial surface 12 can protrude out of the first notch 212 for better heat dissipation without considering the power generation efficiency, and the second radial surface 14 does not protrude out of the second notch 214, and the principle is the same as that of the first radial surface 12, which will not be described here.

[0091] In the embodiment, the inlet 34 and the outlet 35 are arranged in an axial direction of the stator structure. The axially arranged inlet 34 and outlet 35 can avoid the cooling medium flowing from the inlet 34 directly along the axial direction of the stator structure to the outlet 35, so that the cooling medium flows more fully in the generator, thereby improving the heat exchange effect.

[0092] In the embodiment, the inlet 34 includes a first inlet 341 and a second inlet 342, and the first inlet 341 and the second inlet 342 are arranged opposite to each other in the axial direction of the stator structure.

[0093] As shown in Figure 3 , the oppositely arranged first inlet 341 and second inlet 342 enable the generator to be bidirectional ventilated in the axial direction of the stator structure, and the external low-temperature cooling gas enters the interior of the generator from both ends in the axial direction through the first inlet 341 and the second inlet 342, and flows along the air gap 5 between the stator structure and the rotor 4, and then flows to the outlet 35 through the gap between the coils 1, and the two streams of gas will produce a disturbance effect after converging in the interior of the generator, so that the cooling gas is more fully contacted with the surface of the coil 1, and the heat exchange effect is better.

[0094] Embodiment 2

[0095] As shown in Figure 4 and Figure 5As shown, the overall structure of the stator structure of the embodiment is basically the same as that in Embodiment 1, and the difference is that, in the embodiment, the cooling medium is liquid, the casing 3 comprises a heat exchange surface 32 for heat exchange, the heat exchange surface 32 is the radially inner circumferential surface of the casing 3, and the first radial surface 12 is in contact with the heat exchange surface 32. Of course, in other embodiments, the cooling channel 31 can also be arranged on the outer circumferential surface of the stator core 2, and arranging the cooling channel 31 on the casing 3 facilitates the arrangement of the cooling channel 31 and avoids the defect of strength reduction of the stator core 2 caused by arranging the cooling channel 31 on the stator core 2.

[0096] In other embodiments, the first radial surface 12 can also be in contact with the side wall of the cooling channel 31, and the side wall of the cooling channel 31 is directly in contact with the surface of the coil 1 for heat exchange, so that the cooling efficiency is higher.

[0097] As shown in the figure, Figure 4 In the embodiment, when the heat exchange surface 32 and the first radial surface 12 of the coil 1 are in contact, there is a certain gap between them, and they are not in direct contact. Due to the effect of the conductor, direct contact may cause short circuit. Of course, in other embodiments, the heat exchange surface 32 can be made of insulating material, and the heat exchange surface 32 can be directly in contact with the first radial surface 12 of the coil 1.

[0098] As shown in the figure, Figure 4 As shown in the figure, the wind driven generator disclosed in the embodiment is provided with a liquid cooling medium, and the wind driven generator further comprises: an air inlet 36 for allowing the cooling gas to flow in; an air outlet 37 for allowing the cooling gas to flow out; and a rotor 4, which is provided with an air gap 5 on the inner circumferential surface of the stator structure, and the cooling gas can contact the second radial surface 14 through the air gap 5.

[0099] As shown in the figure, Figure 5 As shown in the figure, the liquid cooling medium enters through the inlet 34 and directly contacts the first radial surface 12 of the coil 1 for heat exchange, and the gaseous cooling medium directly exchanges heat with the second radial surface 14 of the coil 1, which shortens the heat exchange path, increases the effective heat exchange area of the cooling medium and the coil 1, and thus improves the cooling efficiency and reduces the temperature rise of the generator. Compared with the indirect heat exchange between the cooling medium and the coil 1 through the stator core 2, the cooling medium directly contacts the surface of the coil 1 for cooling, and the heat exchange path is short and the cooling efficiency is higher.

[0100] In the embodiment, the air inlet 36 and the air outlet 37 are arranged in an axial direction of the stator structure. After the cooling gas enters the generator from the air inlet 36, it flows in the air gap 5 inside the generator for heat dissipation, avoiding direct flow along the axial direction of the stator structure, so that the cooling gas flows more fully inside the generator, improving the heat exchange effect.

[0101] In this embodiment, the cooling channel 31 can be configured as a spiral or a straight line. The spiral or straight cooling channel 31 increases the heat exchange area and improves the heat exchange efficiency.

[0102] like Figure 4 As shown, in this embodiment, the radial outer circumferential surface of the stator core 2 is in contact with the heat exchange surface 32. The heat exchange surface 32 simultaneously exchanges heat with the stator core 2 and indirectly cools the coil 1, increasing the effective heat exchange area of ​​the coil 1 and improving the heat exchange effect.

[0103] Example 3

[0104] like Figure 6 As shown, the overall structure of the stator structure in this embodiment is basically the same as that in embodiment 2. The difference is that in this embodiment, the housing 3 also includes a liquid cooling jacket 33. The liquid cooling jacket 33 is made of insulating material and is located between the cooling channel 31 and the radial outer circumferential surface of the stator core 2. The heat exchange surface 32 is the radial inner circumferential surface of the liquid cooling jacket 33. The liquid cooling jacket 33 can insulate and seal the cooling channel 31, preventing the liquid cooling medium from contacting the coil 1.

[0105] Example 4

[0106] like Figure 7 As shown, the overall structure of the stator structure in this embodiment is basically the same as that in embodiment 2. The difference is that in this embodiment, the inner diameter of the cooling channel 31 is smaller than the inner diameter of the heat exchange surface 32. The heat exchange surface 32 is located between the inner circumferential surface of the cooling channel 31 and the outer circumferential surface of the cooling channel 31 along the radial direction of the stator core 2. Since the heat exchange surface 32 is in contact with the outer circumferential surface of the stator core 2, that is, the cooling channel 31 is embedded in the stator core 2, that is, the cooling channel 31 overlaps with the coil 1 along the radial direction of the stator core 2, which increases the heat exchange area between the cooling channel 31, the stator core 2 and the coil 1, and improves the heat exchange efficiency.

[0107] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A stator structure of a wind power generator, comprising: an inlet for a cooling medium to flow in; an outlet for the cooling medium to flow out; a stator core; a cooling channel at a radial outer circumferential surface of the stator core, the inlet being in communication with the cooling channel; characterized in that the stator structure further comprises a coil disposed on the stator core, the coil having a first radial surface and a second radial surface, the first radial surface being close to and exposed from a radial outer circumferential surface of the stator core, the second radial surface being close to and exposed from a radial inner circumferential surface of the stator core, cooling gas flowing to a gap between the stator core and a rotor to contact and exchange heat with the second radial surface of the coil; the inlet comprises a first inlet and a second inlet, the first inlet and the second inlet being oppositely disposed along an axial direction of the stator structure, the outlet being located between the first inlet and the second inlet. the coil comprises a first coil side and a second coil side, the first coil side and the second coil side being disposed along a radial direction of the stator structure, a maximum outer diameter of the first coil side being greater than a maximum outer diameter of the second coil side, the first radial surface being an outer circumferential surface of the first coil side, the second radial surface being an inner circumferential surface of the second coil side, the first coil side and the second coil side being connected. the stator structure comprises a first coil slot and a second coil slot, the first coil slot being formed at the radial outer circumferential surface of the stator core, the second coil slot being formed at the radial inner circumferential surface of the stator core, the first coil side being disposed in the first coil slot, the second coil side being disposed in the second coil slot. the inlet and the outlet are misaligned along the axial direction of the stator structure. the cooling medium is gas, the first radial surface being in communication with the cooling channel, the cooling medium being able to contact the first radial surface through the cooling channel. the cooling medium is liquid, the first radial surface being in contact with a side wall of the cooling channel. the stator structure comprises a housing, the cooling channel being disposed on the housing, the housing comprising a heat exchange surface for heat exchange, the heat exchange surface being a radial inner circumferential surface of the housing, the first radial surface being in contact with the heat exchange surface.

2. The stator structure of claim 1, wherein the cooling channel is in a spiral shape or a straight line shape.

3. The stator structure of claim 2, wherein the radial outer circumferential surface of the stator core is in contact with the heat exchange surface.

4. The stator structure of claim 1, wherein the housing further comprises a liquid cooling jacket, the liquid cooling jacket being made of an insulating material, the liquid cooling jacket being located between the cooling channel and the radial outer circumferential surface of the stator core, the heat exchange surface being a radial inner circumferential surface of the liquid cooling jacket.

5. The stator structure of claim 1, wherein an inner diameter of the cooling channel is smaller than an inner diameter of the heat exchange surface.

6. The stator structure of claim 1, wherein the stator structure according to any one of claims 1-11.

7. The stator structure of claim 6, wherein the cooling medium is gas, the wind power generator further comprising a rotor, an air gap being included between the rotor and an inner circumferential surface of the stator structure, the cooling medium being able to contact the second radial surface through the air gap.

8. The stator structure of claim 6, wherein the cooling medium is liquid, the wind power generator further comprising 9. The stator structure of claim 7, wherein ​ 10. The stator structure of claim 7, wherein ​ 11. The stator structure of claim 7, wherein ​ 12. A wind driven electric power generator, characterised in that ​ 13. A wind driven electric power generator as claimed in claim 12 wherein, ​ 14. A wind driven electric power generator as claimed in claim 12 wherein, ​ an inlet for a flow of cooling gas to enter; an outlet for a flow of cooling gas to exit; a rotor comprising an air gap with an inner circumferential surface of the stator structure, the cooling gas being contactable with the second radial surface through the air gap.

15. A wind driven electric power generator as claimed in claim 14 wherein, the inlet and the outlet are axially offset along the stator structure.

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