Stator, generator and wind turbine

Abstract

The present application relates to a stator, a generator, and a wind turbine generator set. The stator comprises: a stator bracket, comprising an annular bracket body and a guide bar, the bracket body comprising a plurality of fixing bars spaced apart along its circumference, a vent hole communicating with the interior of the bracket body being provided between two adjacent fixing bars, a plurality of guide bars being detachably connected to the fixing bars, and an extension direction of the guide bar being arranged obliquely relative to the axial direction; a punching assembly, comprising a plurality of punching units, each group of slot units connected in the axial direction of each punching unit forming a stator slot, the stator slot being connected to the vent hole, a snap-in groove being provided on the radially outer side of the punching unit facing the guide bar, each punching unit being snap-fitted with the guide bar via the snap-in groove, so that the extension direction of the stator slot is arranged obliquely relative to the axial direction. The stator bracket and the punching assembly of the present application are reliably connected, have good heat dissipation, and will not become detached due to temperature influences.

Description

Technical Field

[0001] The present application relates to the field of wind power technology, and in particular to a stator, a generator and a wind turbine generator set. Background Art

[0002] Torque ripple of a generator or motor is a crucial metric for measuring performance. There are two common approaches to reducing torque ripple: one is through winding connections, and the other is through mechanical structure, such as rotor skew or stator slot skew.

[0003] Existing stator skew slots are mostly formed by welding, where multiple punchings and a connecting structure are welded together to form the core. The core punchings are then fused to the stator frame using a shrink fit method. This method provides poor heat dissipation and makes the core susceptible to thermal expansion and deformation during operation. In generators with an internal stator structure, this can cause the core to separate from the stator frame during operation due to thermal expansion. Summary of the Invention

[0004] The embodiments of the present application provide a stator, a generator, and a wind turbine generator set, wherein the stator bracket and the punching sheet assembly of the stator are reliably connected, have good heat dissipation effect, and will not separate due to temperature influence.

[0005] On the one hand, according to an embodiment of the present application, a stator is proposed, including: a stator bracket, including an annular bracket body and a guide bar, the bracket body including a plurality of fixing bars spaced apart along its own circumference, a vent hole connected to the interior of the bracket body is provided between two adjacent fixing bars, the number of guide bars is multiple and they are respectively detachably connected to the fixing bars, and the extension direction of the guide bar is inclined relative to the axial direction of the bracket body; a punching assembly is provided on the stator bracket, the punching assembly includes a plurality of punching units, the punching unit is formed with a plurality of slot units on the side of the bracket body in the radial direction away from the guide bar, the plurality of slot units are spaced apart along the circumferential direction, the plurality of punching units are stacked along the axial direction of the bracket body, each group of slot units connected in the axial direction of each punching unit forms a stator slot, the stator slot is connected to the vent hole, a snap-in groove is provided on the radial outer side of the punching unit facing the guide bar, and each punching unit is snap-fitted with the guide bar through the snap-in groove, so that the extension direction of the stator slot is inclined relative to the axial direction.

[0006] According to one aspect of an embodiment of the present application, a plurality of first holes are provided on the fixed bar and spaced apart along the axial direction, a plurality of second holes are provided on the guide bar, each second hole is radially opposite to one of the first holes and connected to each other, the guide bar has a first side surface and a second side surface that are opposite to each other in the circumferential direction, and the absolute value of the difference between the distance between the first side surface of at least one second hole and the center of the second hole and the distance between the first side surface and the center of the second hole is greater than zero.

[0007] According to one aspect of an embodiment of the present application, the cross-section of the guide bar along its own extension direction is dovetail-shaped, the area of ​​the guide bar facing the punching sheet assembly in the radial direction is larger than the area of ​​the side away from the punching sheet assembly, and the shape of the snap-fit ​​groove matches the cross-sectional shape of the guide bar and snaps into place.

[0008] According to one aspect of the embodiment of the present application, the stator bracket further includes positioning plates arranged in pairs and connected to the bracket body, the positioning plates arranged in pairs are distributed at intervals in the axial direction, and the punching sheet assembly is clamped between the positioning plates arranged in pairs.

[0009] According to one aspect of an embodiment of the present application, the punching assembly also includes a connecting component, which includes a connecting rod and a locking cap. The connecting rod extends axially, and a strip hole is provided on the punching unit. The strip holes of two adjacent punching units partially overlap in the axial direction. The connecting rod is inserted into the strip hole and can move circumferentially in the strip hole. The locking cap is connected to the connecting rod and pressed against the positioning plate.

[0010] According to one aspect of the embodiment of the present application, there are multiple strip-shaped holes on each punching unit and they are spaced apart in the circumferential direction, and a connecting component is provided in each strip-shaped hole of the punching unit.

[0011] According to one aspect of an embodiment of the present application, there are multiple snap-in grooves on each punching unit, and the multiple snap-in grooves are spaced apart in the circumferential direction. Each snap-in groove is snap-fitted with one of the guide strips, and the strip holes and the snap-in grooves are alternately arranged in the circumferential direction.

[0012] According to one aspect of the embodiment of the present application, the positioning plate is an annular structure and is arranged around the axis of the bracket body. The positioning plate is arranged to protrude from the bracket body in the radial direction of the bracket body.

[0013] According to one aspect of an embodiment of the present application, the surface of the guide strip facing the punching unit in the radial direction is an arc-shaped surface, and the center of the circle coincides with the center of the circle of the bracket body.

[0014] According to one aspect of an embodiment of the present application, the punching sheet assembly further includes a gasket block group, and a plurality of gasket block groups spaced apart along the circumferential direction are arranged between at least two adjacent punching sheet units, and a through groove is formed between two adjacent gasket block groups to connect the vent hole and the stator slot.

[0015] According to one aspect of the embodiment of the present application, the pad block group is a block-shaped structure extending along the circumferential direction by a predetermined length.

[0016] According to one aspect of the embodiment of the present application, the bracket body has an inner annular surface and an outer annular surface in the radial direction, and the punching sheet assembly is arranged on the inner annular surface or the outer annular surface.

[0017] According to one aspect of the embodiment of the present application, the punching sheet unit is in the shape of an arc-shaped sheet extending along the circumferential direction, and there are multiple punching sheet assemblies, which are distributed at intervals or successively in the circumferential direction.

[0018] According to one aspect of the embodiment of the present application, the punching unit is in the shape of a closed ring extending in the circumferential direction, and the number of the punching assembly is one and is arranged around the axis of the bracket body.

[0019] On the other hand, according to an embodiment of the present application, there is provided a generator, comprising: a rotor, the above-mentioned stator, wherein the stator and the rotor are coaxially arranged and rotationally matched.

[0020] In yet another aspect, according to an embodiment of the present application, a wind turbine generator set is provided, comprising the above-mentioned generator.

[0021] According to the stator, generator and wind turbine generator set provided in the embodiments of the present application, the stator includes a stator bracket and a punching sheet assembly, the stator bracket includes a bracket body and a guide bar, the stator bracket includes fixing bars spaced along its own circumference, each fixing bar is connected to a guide bar, the punching sheet units of the punching sheet assembly are stacked and are all engaged with the guide bar through a snap-in groove, since the extension direction of the guide bar is inclined relative to the axial direction of the stator bracket, after the punching sheet units of the punching sheet assembly are connected to the guide bar, each group of slot units connected in the axial direction of each punching sheet unit forms a stator slot extension direction inclined relative to the axial direction, which meets the requirements of the stator skew slot and can reduce the torque fluctuation of the generator used by the stator. Since a mechanical connection and positioning method is adopted, the stator will not be separated due to temperature.

[0022] Furthermore, the guide bars and fixing bars are detachably connected, allowing selection of the appropriate guide bar based on the desired stator slot inclination angle, improving the stator bracket's versatility. Furthermore, because vents are provided between adjacent fixing bars, connecting to the interior of the bracket body, the stator slots are connected to the vents, facilitating heat dissipation from the punching assembly, preventing damage to the stator due to excessive temperatures and extending the overall stator's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic structural diagram of a wind turbine generator set according to an embodiment of the present application;

[0025] Figure 2 This is a schematic structural diagram of a generator according to an embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of the partial structure of a generator with the end cover removed according to an embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of a stator according to an embodiment of the present application;

[0028] Figure 5 yes Figure 4 Cross-sectional view along AA direction;

[0029] Figure 6 This is a schematic structural diagram of a stator bracket according to an embodiment of the present application;

[0030] Figure 7 yes Figure 6 Enlarged view of point B in FIG.

[0031] Figure 8 This is a schematic diagram of the partial structure of a stator bracket according to one embodiment of the present application;

[0032] Figure 9 yes Figure 8 Enlarged view of point C in the middle;

[0033] Figure 10 This is a structural diagram of a punching unit according to an embodiment of the present application;

[0034] Figure 11 This is a schematic diagram of the partial structure of a stator according to an embodiment of the present application;

[0035] Figure 12 This is a schematic structural diagram of a punching assembly according to an embodiment of the present application;

[0036] Figure 13 yes Figure 12 Cross-sectional view along DD direction;

[0037] Figure 14 yes Figure 12 Cross-sectional view along EE direction;

[0038] Figure 15 yes Figure 12 Cross-sectional view along the FF direction;

[0039] Figure 16 yes Figure 12 Enlarged view of point G in the middle;

[0040] Figure 17 It is a structural schematic diagram of a generator according to another embodiment of the present application.

[0041] in:

[0042] 1- generator;

[0043] 100 - stator; 10 - stator bracket; 11 - bracket body; 111 - fixing bar; 111a - first hole; 112 - vent hole; 113 - inner annular surface; 114 - outer annular surface; 12 - guide bar; 121 - second hole; 122 - first side surface; 123 - second side surface; 13 - positioning plate;

[0044] 20 - Punching sheet assembly; 21 - Punching sheet unit; 211 - Slot unit; 212 - Clamping slot; 213 - Strip hole; 21a - Tooth; 21b - Yoke; 22 - Connecting component; 221 - Connecting rod; 222 - Locking cap; 23 - Spacer block assembly; 231 - Through slot; 24 - Stator slot;

[0045] 30- fasteners;

[0046] 200-rotor;

[0047] 2-tower; 3-nacelle; 4-impeller; 401-hub; 402-blade;

[0048] X-circumferential direction; Y-radial direction; Z-axial direction.

[0049] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0050] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are set forth in order to provide a comprehensive understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessary ambiguity in the present application; and, for clarity, the sizes of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0051] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the stator, generator and wind turbine generator set of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] See also Figure 1An embodiment of the present application provides a wind turbine generator set, comprising a tower 2, a nacelle 3, a generator 1, and an impeller 4. The tower 2 is connected to the wind turbine foundation, the nacelle 3 is disposed at the top of the tower 2, and the generator 1 is disposed in the nacelle 3. In some examples, the generator 1 may be located outside the nacelle 3. Of course, in some examples, the generator 1 may also be located inside the nacelle 3. The impeller 4 includes a hub 401 and a plurality of blades 402 connected to the hub 401. The impeller 4 is connected to the generator 1 via the hub 401.

[0053] See also Figures 1 to 3 The embodiment of the present application also provides a generator 1, which includes a rotor 200 and a stator 100. The rotor 200 and the stator 100 are coaxially arranged and rotated together. The hub 401 can be specifically connected to the rotor 200 of the generator 1. When wind force acts on the blades 402, it drives the entire impeller 4 and the rotor 200 of the generator 1 to rotate, thereby meeting the power generation requirements of the wind turbine generator set.

[0054] The torque fluctuation of the generator 1 is a very important indicator for measuring the generator 1. It has been verified that the torque fluctuation can be reduced by using a mechanical structure, such as using skewed slots in the stator 100.

[0055] Existing stator skew slots are mostly formed by welding, where multiple punching units and a structure connecting the punching units are welded together to form an iron core. The iron core's punching units are then fitted into the stator bracket 10 using a shrink fit method. This method has poor heat dissipation and makes the iron core susceptible to thermal expansion and deformation during operation. If the generator 1 has an internal stator structure, this can cause the core to separate from the stator bracket 10 during operation due to thermal expansion.

[0056] In order to solve the above technical problems, an embodiment of the present application further provides a stator 100, wherein the stator bracket of the stator 100 is reliably connected to the punching sheet assembly, and has good heat dissipation effect, and will not be separated due to temperature influence. The stator 100 can be produced and sold as an independent component. Of course, it can also be used in the generator 1 provided in the above embodiment and as a component of the generator 1.

[0057] In order to better understand this application, Figures 4 to 17 The stator 100 and the generator 1 according to the embodiments of the present application are described in detail.

[0058] See also Figure 4 as well as Figure 10As shown, the stator 100 provided in the embodiment of the present application includes a stator bracket 10 and a punching sheet assembly 20. The stator bracket 10 includes an annular bracket body 11 and a guide bar 12. The bracket body 11 includes a plurality of fixing bars 111 spaced apart along its own circumferential direction X. A vent hole 112 connected to the interior of the bracket body 11 is provided between two adjacent fixing bars 111. There are multiple guide bars 12 and they are respectively detachably connected to the fixing bars 111. The extension direction of the guide bar 12 is inclined relative to the axial direction Z of the bracket body 11. The punching sheet assembly 20 is arranged on the stator bracket 10, and the punching sheet assembly 20 includes a plurality of punching sheet units 21. The punching sheet unit 21 is formed with a plurality of slot units 211 on the side of the bracket body 11 away from the guide bar 12 in the radial direction Y. The plurality of slot units 211 are spaced apart along the circumferential direction X. The plurality of punching sheet units 21 are stacked along the axial direction Z of the bracket body 11. Each group of slot units 211 connected in the axial direction Z of each punching sheet unit 21 forms a stator slot 24. The stator slot 24 is connected to the vent 112. A snap-in groove 212 is provided on the radial outer side of the punching sheet unit 21 facing the guide bar 12. Each punching sheet unit 21 is snap-fitted with the guide bar 12 through the snap-in groove 212, so that the extension direction of the stator slot 24 is inclined relative to the axial direction Z.

[0059] Optionally, the number of fixing bars 111 included in the stator bracket 10 is not specifically limited, and can be two, three or even more. A vent hole 112 is formed between two adjacent fixing bars 111. The vent hole 112 is set through the wall of the bracket body 11 in the radial direction Y of the bracket body 11 to communicate with the interior of the bracket body 11.

[0060] Optionally, the number of guide bars 12 may be equal to or less than the number of fixing bars 111, and each guide bar 12 may be detachably connected to one of the fixing bars 111. For example, the detachable connection may be achieved by bolt fastening, screw fastening, or pin-positioning connection.

[0061] Optionally, the inclination angle of the guide bar 12 is not specifically limited and can be set according to the inclination angle of the stator slot 24 .

[0062] Optionally, each punching unit 21 is formed with a plurality of slot units 211 on the side of the bracket body 11 facing away from the guide bar 12 in the radial direction Y, and the number of slot units 211 formed by each punching unit 21 is the same. In the axial direction Z, the corresponding slot units 211 of each punching unit 21 are connected to form the stator slots 24.

[0063] For example, each punching unit 21 includes n slot units 211, where n is an integer greater than or equal to 3. The slot unit 211 at the same end in the circumferential direction X is the first slot unit, and the last slot unit 211 is the nth slot unit. Then, the first slot unit of each punching unit 21 is connected in sequence in the axial direction Z to form one of the stator slots 24, and the second slot unit of each punching unit 21 is connected in sequence in the axial direction Z to form another stator slot 24. And so on, the nth slot unit 211 of each punching unit 21 is connected in sequence in the axial direction Z to form the nth stator slot 24.

[0064] Optionally, the stator slots 24 are in communication with the vents 112, meaning that the cooling fluid passing through the vents 112 can contact the stator slots 24. For example, when the generator 1 is an external-stator generator, the cooling fluid outside the generator 1 can enter the interior of the bracket body 11 through the vents 112 and contact the stator slots 24. When the generator 1 is an internal-stator generator, the cooling airflow entering from the interior of the stator 100 can pass through the vents 112 to the exterior of the stator bracket 10 and contact the stator slots 24.

[0065] Optionally, the snap-fitting groove 212 on the punching unit 21 and the fixing strip 111 can be snap-fitted together, for example, the fixing strip 111 can partially extend into the snap-fitting groove 212 of the punching unit 21 and snap-fitted to the snap-fitting groove 212 .

[0066] According to the stator 100 provided in the embodiment of the present application, the stator bracket 10 includes fixing bars 111 distributed at intervals along its own circumferential direction X, and each fixing bar 111 is connected to a guide bar 12. The punching units 21 of the punching assembly 20 are stacked and are all engaged with the guide bar 12 through the snap-in groove 212. Since the extension direction of the guide bar 12 is tilted relative to the axial direction Z of the stator bracket 10, after the punching units 21 of the punching assembly 20 are connected to the guide bar 12, each group of slot units 211 of each punching unit 21 connected in the axial direction Z forms a stator slot 24, the extension direction of which is tilted relative to the axial direction Z, which meets the requirements of the stator skew slot and can reduce the torque fluctuation of the generator 1 used by the stator 100. Since a mechanical connection and positioning method is adopted, the stator 100 will not be detached due to temperature.

[0067] Furthermore, the guide bar 12 and the fixing bar 111 are detachably connected, and a corresponding guide bar 12 can be selected according to the required inclination angle of the stator slot 24 , thereby improving the versatility of the stator bracket 10 .

[0068] Furthermore, during the lamination process of the sheet unit 21, since the sheet unit 21 needs to be shaped, especially the relative position requirements of the snap-in groove 212 of the previous sheet unit 21 and the snap-in groove 212 of the next sheet unit 21 are very high, corresponding tooling is required for precise lamination. If it is not removable, it is difficult to ensure the relative position between the previous sheet unit 21 and the next sheet unit 21. Therefore, the premise of non-removability is that the entire sheet unit 21 must be stacked with high precision to form the sheet assembly 20, and then the fixing strip 111 is installed in the snap-in groove 212 for fixing. After ensuring the relative position of each sheet unit 21, it is lifted from the tooling and placed on the stator bracket 10 for welding and fixing. This method is difficult to implement in large-diameter generators, because after the sheet unit 21 is fixed, it is lifted up and easily deformed due to its large diameter and heavy weight, resulting in the sheet assembly 20 being unable to be assembled into the stator bracket.

[0069] If the guide bars 12 are detachable, they can be directly stacked on the stator support 10. Due to the detachable nature of the guide bars 12, they are generally not directly screwed and fixed to the fixing bars 111 during the stacking of the sheet units 21. The position of the guide bars 12 can be adjusted at any time during the stacking of the sheet units 21. The position of the guide bars 12 and the fixing bars 111 can be completely shortened after the entire stacking is completed. This ensures that the relative position of each guide bar and the engaging groove 212 of the sheet unit 21 match, facilitating the stacking of the sheet units 21 of the sheet assembly 20.

[0070] At the same time, since a vent hole 112 connected to the interior of the bracket body 11 is provided between two adjacent fixing bars 111, the stator slot 24 is connected to the vent hole 112, which is beneficial to the heat dissipation of the punching assembly 20, avoids damage to the stator 100 due to excessive temperature, and improves the overall service life of the stator 100.

[0071] In some optional embodiments, the stator 100 provided in the embodiments of the present application may have a stator body 11 that is annular and cylindrical in shape. A plurality of vent holes 112 are provided in the circumferential direction X of the stator body 11, and the remaining portion between two adjacent vent holes 112 forms a guide bar 12. The guide bar 12 and the remaining portion of the stator body 11 may be an integral structure, facilitating the molding of the stator body 11.

[0072] Optionally, the fixing strip 111 may be a strip-shaped structure extending along the axial direction Z of the bracket body 11, which can improve the overall rigidity of the bracket body 11. Optionally, the shape of the vent hole 112 may be rectangular or oval, and the oval shape may be selected so that the hole wall of the vent hole 112 has a smooth transition surface, which is conducive to the passage of cooling air.

[0073] See also Figures 4 to 10 As shown, as an optional embodiment, the fixing bar 111 is provided with a plurality of first holes 111a spaced apart along the axial direction Z, and the guide bar 12 is provided with a plurality of second holes 121. Each second hole 121 is disposed opposite and connected to one of the first holes 111a in the radial direction Y. The guide bar 12 has a first side surface 122 and a second side surface 123 disposed opposite each other in the circumferential direction X. The absolute value of the difference between the distance a between the first side surface 122 of at least one second hole 121 and the center of the second hole 121 and the distance b between the second side surface 122 and the center of the same second hole 121 is greater than zero. This arrangement not only satisfies the requirement for detachable connection between the guide bar 12 and the corresponding fixing bar 111, but also ensures the required inclination angle of the extension direction of the guide bar 12 relative to the axial direction Z by aligning the second hole 121 with the corresponding first hole 111a.

[0074] See also Figures 7 to 13 In some optional embodiments, the guide bar 12 and the fixing bar 111 can be connected by a fastener 30, for example, a bolt or a screw can be used, and one of the first hole 111a and the second hole 121 can be set as a threaded hole. The fastener 30 is inserted into the other of the first hole 111a and the second hole 121 and is threadedly connected to the first hole 111a or the second hole 121 to achieve a detachable connection between the guide bar 12 and the fixing bar 111.

[0075] As an optional embodiment, one of the first hole 111a and the second hole 121 is a threaded hole and the other can be a stepped hole. Through the above setting, the nut of the fastener 30 can sink into the stepped hole without affecting the fit between the punch assembly 20 and the guide bar 12 or the appearance of the bracket body 11.

[0076] In some optional embodiments, the cross-section of the guide bar 12 along the extension direction is dovetail-shaped, the area of ​​the guide bar 12 facing the punch assembly 20 in the radial direction Y is larger than the area of ​​the side away from the punch assembly 20, and the shape of the engaging groove 212 matches the cross-sectional shape of the guide bar 12 and engages with it. This arrangement facilitates the upper limit position of the guide bar 12 and the punch assembly 20 in the radial direction Y of the bracket body 11, preventing the two from separating in the radial direction Y.

[0077] As an optional embodiment, in the stator 100 provided in the embodiment of the present application, the surface of the guide bar 12 facing the punching unit 21 in the radial direction Y is an arc-shaped surface, and the center of the circle coincides with the center of the circle of the bracket body 11. Through this arrangement, when the inclination angle of the stator slot 24 is large, it can adapt to the inclination angle, thereby facilitating the lamination of the punching assembly 20.

[0078] Please continue reading Figures 7 to 13In some optional embodiments, the stator 100 provided in the embodiments of the present application further comprises a stator support 10 that is provided in pairs and connected to the support body 11. The paired positioning plates 13 are spaced apart in the axial direction Z, and the punching sheet assembly 20 is clamped between the paired positioning plates 13. By providing the positioning plates 13, the positioning plates 13 can be limited in the axial direction Z of the support body 11, thereby preventing the multiple punching sheet units 21 from moving in the axial direction Z after being stacked, thereby ensuring the safety performance of the punching sheet units 21.

[0079] As an optional embodiment, the positioning plate 13 is provided to protrude from the bracket body 11 in the radial direction Y of the bracket body 11, and the orthographic projection of the positioning plate 13 in the axial direction Z of the bracket body 11 covers at least a portion of the punching unit 21, so as to facilitate the positioning of the punching unit 20 in the axial direction Z. In addition, the provision of the stator 100 plate also helps to improve the overall strength of the stator bracket 10.

[0080] In some optional embodiments, the stator 100 provided in the embodiments of the present application, the positioning plate 13 and the bracket body 11 can be connected by a fixed connection method, such as welding or integral molding. This ensures the connection strength between the positioning plate 13 and the bracket body 11. Of course, the fixed connection between the positioning plate 13 and the bracket body 11 is only an optional implementation method. In some other embodiments, the two can also be connected to each other in a detachable connection method, such as bolt fastening, as long as the limit requirements of the punch assembly 20 in the axial direction Z can be guaranteed.

[0081] In some optional embodiments, the positioning plate 13 is an arc-shaped plate extending a predetermined length along the circumferential direction X. The positioning plate 13 is provided protruding from the bracket body 11 in the radial direction Y of the bracket body 11. The positioning plate 13 may protrude inwardly or outwardly. When the punch assembly 20 is provided on the inner side of the bracket body 11, the positioning plate 13 protrudes inwardly. When the punch assembly 20 is provided on the outer side of the bracket body 11, the positioning plate 13 protrudes outwardly. The extension length of the positioning plate 13 in the circumferential direction X can be specifically set according to the extension length of the corresponding punch assembly 20 in the circumferential direction X, as long as the positioning plate 13 can ensure the limiting effect on each punch unit 21 of the punch assembly 20.

[0082] It is understood that the above-described structural form of the positioning plate 13 is only an optional embodiment. In some other examples, the positioning plate 13 can also be an annular structure and arranged around the axis of the bracket body 11. The positioning plate 13 is arranged to protrude from the bracket body 11 in the radial direction Y of the bracket body 11. The positioning plate 13 adopts the above-described structural form, which can position each punching unit 21 of the punching assembly 20 located at any position in the circumferential direction X in the axial direction Z.

[0083] Please continue reading Figures 7 to 13As an optional embodiment, the stator 100 provided in the embodiment of the present application, the punching assembly 20 also includes a connecting component 22, the connecting component 22 includes a connecting rod 221 and a locking cap 222, the connecting rod 221 extends along the axial direction Z, and a strip hole 213 is provided on the punching unit 21. The strip holes 213 of two adjacent punching units 21 partially overlap in the axial direction Z, the connecting rod 221 is inserted into the strip hole 213 and can move in the circumferential direction X in the strip hole 213, and the locking cap 222 is connected to the connecting rod 221 and pressed against the positioning plate 13.

[0084] By providing strip holes 213 on the punching units 21 and partially overlapping the strip holes 213 of two adjacent punching units 21 in the axial direction Z, after each punching unit 21 is engaged with the inclined guide bar 12, the connecting rod 221 can be inserted into the strip holes 213 of each guide punching unit 21 in the axial direction Z. Through the above arrangement, each punching unit 21 can be connected and fixed to the positioning plate 13 through the connecting rod 221 and the locking cap 222, thereby preventing the punching unit 21 from being separated from the guide bar 12 under the action of external force. At the same time, when the multiple punching units 21 of the punching assembly 20 are engaged with the guide bar 12 through their respective engaging grooves 212, they can rotate in the circumferential direction X according to the inclination angle of the guide bar 12 without being restricted by the connecting rod 221, thereby ensuring the installation requirements of the punching units 21 and the inclination requirements of the stator slots 24.

[0085] Furthermore, the correspondingly arranged connecting member 22 can press the positioning plate 13 to ensure the lamination quality of the punching sheet assembly 20 and prevent excessive tooth expansion.

[0086] See also Figures 11 to 15 In some optional embodiments, each punching unit 21 has a plurality of strip-shaped holes 213 spaced apart in the circumferential direction X. A connecting member 22 is disposed within each strip-shaped hole 213 of the punching unit 21. By providing a plurality of strip-shaped holes 213, the clamping effect of the plurality of punching units 21 is ensured, thereby optimizing the lamination quality.

[0087] Optionally, in Figure 14 In the corresponding cross-sectional position, the guide bar 12 is located to the left of the fixed bar 111, and the connecting rod 221 is located to the right of the bar hole 213 corresponding to the punching unit 21. At this time, the position of the punching unit 21 is rotated counterclockwise by an angle relative to the fixed bar 111. Figure 15In the middle, corresponding to the cross-sectional position, the guide bar 12 is positioned to the right relative to the fixed bar 111, and the connecting rod 221 is positioned to the left in the bar hole 213. At this time, the position of the punching unit 21 is rotated clockwise by an angle relative to the fixed bar 111. By setting a plurality of bar holes 213, it is possible to ensure the clamping requirements of the punching unit 21 and the rotation requirements of the punching unit 21 when it cooperates with the guide bar 12, which is beneficial to the tilt setting requirements of the stator slot 24.

[0088] As an optional embodiment, the stator 100 provided in the embodiment of the present application has a plurality of engaging grooves 212 on each punching unit 21, the plurality of engaging grooves 212 being spaced apart in the circumferential direction X. Each engaging groove 212 engages with one of the guide bars 12, and the strip-shaped holes 213 and the engaging grooves 212 are alternately arranged in the circumferential direction X. This arrangement ensures the coordination requirements between the guide bars 12 and the connecting component 22, while preventing the strip-shaped holes 213 and the engaging grooves 212 from being opposite to each other in the radial direction Y, thereby preventing the strength of the punching unit 21 from being affected.

[0089] As an optional embodiment, the punching unit 21 may include a yoke 21b and a tooth 21a, the yoke 21b is a sheet-like structure extending along the circumferential direction X, the tooth 21a is a strip-like body extending along the radial direction Y, the number of tooth 21a is multiple and they are spaced apart in the circumferential direction X, each tooth 21a is connected to the yoke 21b, and a slot unit 211 is formed between two adjacent teeth 21a, and the stator slot 24 and the strip hole 213 are both arranged on the yoke 21b.

[0090] As an optional embodiment, the punching unit 21 provided in the embodiment of the present application is in the shape of an arc-shaped sheet extending along the circumferential direction X, and the number of punching assemblies 20 is multiple, and the multiple punching assemblies 20 are distributed at intervals or successively in the circumferential direction X. It will be understood that this is an optional embodiment, and in some other embodiments, the punching unit 21 can also be in the shape of a closed ring extending along the circumferential direction X, and the number of punching assemblies 20 can be one and arranged around the axis of the bracket body 11. This can also meet the functional requirements of the stator 100.

[0091] See also Figure 16 In some optional embodiments, the punching unit 21 provided in the embodiments of the present application and the punching assembly 20 further include a pad group 23. A plurality of pad groups 23 spaced apart along the circumferential direction X are provided between at least two adjacent punching units 21. A through slot 231 is formed between two adjacent pad groups 23 to connect the vent 112 with the stator slot 24. By providing the pad group 23, the cooling airflow entering through the vent can quickly enter the stator slot 24 through the through slot 231, which is beneficial to the heat dissipation of the stator 100 and ensures the life of the stator 100. Optionally, the pad group can be a block-shaped structure extending a predetermined length along the circumferential direction.

[0092] As an optional embodiment, the stator 100 provided in the embodiment of the present application has a support body 11 having an inner annular surface 113 and an outer annular surface 114 in the radial direction Y, and the punching sheet assembly 20 is disposed on the inner annular surface 113. When the stator 100 of the above type is used in the generator 1, the rotor 200 can be disposed inside the stator 100, that is, a generator 1 in the form of an outer stator 100 and an inner rotor 200 is formed.

[0093] See also Figure 17 Of course, setting the punching sheet assembly 20 on the inner annular surface 113 of the bracket body 11 is only an optional implementation method. In some other examples, the punching sheet assembly 20 can also be set on the outer annular surface 114 of the bracket body 11. When it is used in the generator 1, the stator 100 can be set inside the rotor 200 to form a generator 1 in the form of an outer rotor 200-inner stator 100.

[0094] The stator 100 provided in the embodiment of the present application changes the existing welding mode for the inclined design of the stator slot 24, and adopts a guide bar 12 that is detachably connected to the bracket body 11 and tilted to connect and position each punching unit 21 of the punching assembly 20, thereby ensuring the tilted setting of the stator slot 24 and reducing the torque fluctuation of the generator 1 used by the stator 100. Due to the use of a mechanical connection and positioning method, the stator 100 will not be affected by temperature and will not detach. The detachable connection between the guide bar 12 and the fixing bar 111 improves the versatility of the stator bracket 10. At the same time, since a vent 112 connected to the inside of the bracket body 11 is provided between two adjacent fixing bars 111, the stator slot 24 is connected to the vent 112, which is beneficial to the heat dissipation of the punching assembly 20, avoids the stator 100 from being damaged due to excessive temperature, and improves the overall service life of the stator 100.

[0095] The generator 1 and the wind turbine generator set provided in the embodiments of the present application, because they include the stator 100 provided in the above embodiments, have the advantages of small torque fluctuation, good heat dissipation effect and high safety performance.

[0096] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A stator (100), characterized in that: include: A stator bracket (10), the stator bracket (10) comprising an annular bracket body (11) and a guide bar (12), the bracket body (11) comprising a plurality of fixing bars (111) spaced apart along its own circumferential direction (X), a vent (112) communicating with the interior of the bracket body (11) being provided between two adjacent fixing bars (111), the guide bars (12) being provided in a plurality and being detachably connected to the fixing bars (111), and the extending direction of the guide bars (12) being arranged obliquely relative to the axial direction (Z) of the bracket body (11); A punching sheet assembly (20) is provided on the stator support (10), the punching sheet assembly (20) comprising a plurality of punching sheet units (21), the punching sheet units (21) being formed with a plurality of slot units (211) on a side of the support body (11) in a radial direction (Y) away from the guide bar (12), the plurality of slot units (211) being spaced apart along the circumferential direction (X), the plurality of punching sheet units (21) being stacked along the axial direction (Z), and each punching sheet unit (21) being spaced apart along the axial direction (Z). Each group of slot units (211) connected in the direction (Z) forms a stator slot (23), and the stator slot (23) is connected to the vent hole (112). A snap-fitting slot (212) is provided on the radial (Y) outer side of the punching unit (21) facing the guide bar (12). Each punching unit (21) is snap-fitted with the guide bar (12) through the snap-fitting slot (212), so that the extension direction of the stator slot (23) is inclined relative to the axial direction (Z).

2. The stator (100) according to claim 1, characterized in that The fixing bar (111) is provided with a plurality of first holes (111a) spaced apart along the axial direction (Z), and the guide bar (12) is provided with a plurality of second holes (121), each of the second holes (121) and one of the first holes (111a) being arranged opposite to each other in the radial direction (Y) and connected to each other, and the guide bar (12) has a first side surface (122) and a second side surface (123) being arranged opposite to each other in the circumferential direction (X), and the absolute value of the difference between the distance between the first side surface (122) of at least one second hole (121) and the center of the second hole (121) and the distance between the first side surface (122) and the center of the second hole (121) is greater than zero.

3. The stator (100) according to claim 1, characterized in that The cross section of the guide bar (12) along its own extension direction is dovetail-shaped, and the area of ​​the guide bar (12) on the side facing the punching assembly (20) in the radial direction (Y) is larger than the area on the side away from the punching assembly (20), and the shape of the snap-fit ​​groove (212) matches the cross-sectional shape of the guide bar (12) and is snap-fitted.

4. The stator (100) according to claim 1, characterized in that The stator bracket (10) further includes positioning plates (13) arranged in pairs and connected to the bracket body (11), the positioning plates (13) arranged in pairs are spaced apart in the axial direction (Z), and the punching sheet assembly (20) is clamped between the positioning plates (13) arranged in pairs.

5. The stator (100) according to claim 4, characterized in that The punching assembly (20) further includes a connecting component (22), the connecting component (22) including a connecting rod (221) and a locking cap (222), the connecting rod (221) extending along the axial direction (Z), a strip hole (213) being provided on the punching unit (21), the strip holes (213) of two adjacent punching units (21) partially overlapping in the axial direction (Z), the connecting rod (221) being inserted into the strip hole (213) and being movable in the strip hole (213) along the circumferential direction (X), the locking cap (222) being connected to the connecting rod (221) and pressed against the positioning plate (13).

6. The stator (100) according to claim 5, characterized in that The number of the strip-shaped holes (213) on each punching unit (21) is multiple and spaced apart in the circumferential direction (X), and the connecting component (22) is correspondingly provided in each strip-shaped hole (213) of the punching unit (21).

7. The stator (100) according to claim 5, characterized in that There are a plurality of the snap-fit ​​grooves (212) on each punching unit (21), and the plurality of snap-fit ​​grooves (212) are spaced apart in the circumferential direction (X). Each snap-fit ​​groove (212) is snap-fitted with one of the guide bars (12), and the bar-shaped holes (213) and the snap-fit ​​grooves (212) are alternately arranged in the circumferential direction (X).

8. The stator (100) according to claim 4, characterized in that The positioning plate (13) is an annular structure and is arranged around the axis of the bracket body (11). The positioning plate (13) is arranged to protrude from the bracket body (11) in the radial direction (Y) of the bracket body (11); Alternatively, the positioning plate (13) is an arc-shaped plate extending along the circumferential direction (X) to a predetermined length, and the positioning plate (13) is arranged to protrude from the bracket body (11) in the radial direction (Y) of the bracket body (11).

9. The stator (100) according to any one of claims 1 to 8, characterized in that: The surface of the guide bar (12) facing the punching unit (21) in the radial direction (Y) is an arc-shaped surface, and the center of the circle coincides with the center of the circle of the bracket body (11).

10. The stator (100) according to any one of claims 1 to 8, characterized in that: The punching sheet assembly (20) further includes a pad block group (23), wherein a plurality of pad block groups (23) are arranged between at least two adjacent punching sheet units (21) and are spaced apart along the circumferential direction (X), and a through groove (231) is formed between two adjacent pad block groups (23) to connect the vent hole (112) and the stator slot (23).

11. The stator (100) according to claim 10, characterized in that The pad block group (23) is a block-shaped structure extending along the circumferential direction (X) to a predetermined length.

12. The stator (100) according to any one of claims 1 to 8, characterized in that: The support body (11) has an inner annular surface (113) and an outer annular surface (114) in the radial direction (Y), and the punch assembly (20) is arranged on the inner annular surface (113) or the outer annular surface (114).

13. A generator, characterized in that: include: Rotor(200) The stator (100) according to any one of claims 1 to 12, wherein the stator (100) and the rotor (200) are coaxially arranged and rotationally engaged.

14. A wind turbine generator set, characterized in that: Comprising the generator of claim 13.

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