Stator and rotor spoke support structure of low-speed generator
By adopting a spoke bracket structure in a wind turbine set, the problem of the low-speed generator stator bracket is easily broken under load torque is solved, and a more economical and efficient bracket design is achieved.
Patent Information
- Application Number
- CN202421047361.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-15
AI Technical Summary
In wind turbines, when the stator support structure of the low-speed generator is subjected to load torque, conventional hollow support structures are prone to fracture problems and have poor economicality.
The spoke support structure of the low-speed generator stator is adopted, including the hub, rim and spoke conditions. The spoke conditions are tangentially connected to the hub and rim to form a frame structure to avoid bending moment loads.
Through the spoke conditions composed of multiple identical profiles, the structural stress is more reasonable, avoiding bending moment loads and only tensile forces or pressures, which improves the economics and load-bearing capacity of the bracket.
Smart Images
Figure CN222620753U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wind power generation, and in particular relates to a stator and rotor spoke bracket structure of a low-speed generator. Background Art
[0002] Wind power is the most valuable and commercially viable power generation method in the renewable energy sector. Available wind energy is widely distributed around the world and has huge reserves.
[0003] The impeller captures the kinetic energy in the air through the blades and converts it into mechanical energy for the impeller to rotate. The impeller increases the speed through the gearbox or directly drives the generator rotor to rotate, forming an induced electromotive force on the generator stator. After the wind turbine is connected to the grid for power generation, the load torque (or electromagnetic torque) that balances the driving torque will act on the generator stator. Therefore, when designing the generator stator bracket structure, in addition to considering the effects of magnetic pull and gravity, the strength of the structure under the action of load torque should also be calculated. In particular, when the impeller directly drives the generator rotor to rotate (i.e., a direct-drive wind turbine), due to the low speed of the generator rotor, the generator stator needs to withstand a larger load torque.
[0004] In conventional technical solutions, the structure of the stator bracket is composed of a continuous large area of metal material. The design of this load-bearing structure is relatively direct and can ensure strength. However, with the increase in the power of wind turbines, the radial and axial dimensions of the generator are constantly increasing, resulting in the conventional bracket structure solution being too heavy and increasingly uneconomical. In order to solve this problem, a bracket structure solution with hollowing has emerged, and its structure adopts a form similar to scattering from the center to the surroundings. However, under the action of the load torque, the bracket structure has to bear the derived bending moment load, resulting in frequent fracture problems in the structure. Therefore, it is necessary to provide a more economical solution while also ensuring the bearing capacity of the bracket structure. Summary of the invention
[0005] In order to solve at least one of the above technical problems, in a first aspect, the utility model provides a low-speed generator stator and rotor spoke support structure, comprising at least a hub, a rim and spokes; the hub and the rim are both annular structural members, the hub is arranged inside the rim, and the spokes are arranged between the hub and the rim;
[0006] One end of the spoke condition is tangentially connected to the outer circumferential surface of the hub, and the other end is intersectingly connected to the rim; the spoke condition includes at least three clockwise spoke conditions and at least three counterclockwise spoke conditions, and the number of the clockwise spoke conditions and the counterclockwise spoke conditions is the same; wherein the clockwise spoke conditions are arranged clockwise around the hub axis; and the counterclockwise spoke conditions are arranged counterclockwise around the hub axis;
[0007] The wheel hub comprises an axle seat and an independent special-shaped flange; the independent special-shaped flange is arranged around the outer circumferential surface of the axle seat; the part where the spoke is connected to the wheel hub is the independent special-shaped flange, and the spoke has at least two connection surfaces with the independent special-shaped flange;
[0008] The clockwise spoke conditions and the counterclockwise spoke conditions are intersected and connected in pairs.
[0009] In a further technical solution, the spokes are made of profiles, and the material and cross-sectional shape of all the spokes are the same.
[0010] The clockwise spoke condition and the counterclockwise spoke condition are evenly arranged around the hub axis;
[0011] The clockwise spoke conditions and the counterclockwise spoke conditions are staggered and connected by welding, overlapping or bolting.
[0012] One end of the spoke condition that is tangentially connected to the hub is connected to an end face of the independent special-shaped flange that is perpendicular to the hub axis. The spoke condition and the special-shaped flange are connected by welding, overlapping, or bolting.
[0013] The spoke condition is closely attached to the independent special-shaped flange from the tangential direction of the outer circumferential surface of the hub to the rim, and the spoke condition is connected to the rim by welding, overlapping or bolting.
[0014] A pull rod is arranged between adjacent clockwise spoke conditions, and the pull rod leads from the position of the spoke condition close to the rim to the position where the adjacent spoke conditions intersect and connect; a pull rod is also arranged between adjacent counterclockwise spoke conditions, and the pull rod leads from the position of the spoke condition close to the rim to the position where the adjacent spoke conditions intersect and connect.
[0015] In a further technical solution, the pull rods arranged between the clockwise spokes and the pull rods arranged between the counterclockwise spokes are intersected and connected in pairs.
[0016] In a second aspect, a generator is provided, comprising a stator and rotor spoke support structure of a low-speed generator as described in the first aspect.
[0017] In a third aspect, a wind turbine generator set is provided, comprising a generator wheel as described in the second aspect.
[0018] The beneficial effects of the utility model are as follows: the support structure is formed by a plurality of identical profiles, and the spokes are tangentially connected to the hub so that when the entire structure is subjected to load moment, the spokes themselves will not bear the derived bending moment load, but only tensile force or compressive force, so the force is more reasonable. The support structure is simple, light in weight, easy to process and manufacture, and economical. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the structure of a stator and rotor spoke bracket of a low-speed generator according to an embodiment of the utility model;
[0020] Figure 2 This is an axonometric view of a stator and rotor spoke support structure of a low-speed generator according to an embodiment of the utility model;
[0021] Figure 3 This is a schematic diagram of the clockwise spoke condition of a stator and rotor spoke support structure of a low-speed generator according to an embodiment of the utility model;
[0022] Figure 4 A schematic diagram of the counterclockwise spoke condition of a stator and rotor spoke support structure of a low-speed generator according to an embodiment of the utility model;
[0023] Figure 5 A schematic diagram of a hub of a stator and rotor spoke support structure of a low-speed generator according to an embodiment of the utility model;
[0024] Figure 6 It is a schematic diagram of an independent special-shaped flange of a stator and rotor spoke support structure of a low-speed generator according to an embodiment of the utility model;
[0025] Figure 7 A bird's-eye view of an independent special-shaped flange of a stator and rotor spoke support structure of a low-speed generator according to an embodiment of the utility model;
[0026] Figure 8 This is an overhead view of a stator and rotor spoke support structure of a low-speed generator according to an embodiment of the utility model.
[0027] Description of Figure Numbers:
[0028] 1. Wheel hub, 1.1. Axle seat, 1.2. Independent special-shaped flange, 1.21. First connecting end face, 1.22. Second connecting end face, 2. Wheel rim, 3. Spoke condition, 3.1. Clockwise spoke condition, 3.2. Counterclockwise spoke condition, 4. Hub axis, 5. Tie rod.
[0029] It is worth noting that the above drawings are used to illustrate the features of the utility model, and are not intended to show any actual structure or reflect the size, relative proportion and other detailed information of various components. In order to more clearly show the principle of the utility model and to avoid unnecessary details that make the principle of the utility model unclear, the examples in the figures have been simplified. These illustrations will not cause inconvenience to technicians in the relevant fields in understanding the utility model, and the actual embodiment may include more modules or components. DETAILED DESCRIPTION
[0030] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the embodiment of the utility model is fully described below in conjunction with the relevant drawings of the embodiment of the utility model. This patent describes only a part of the embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0031] like Figure 1 and Figure 2 As shown, a low-speed generator stator and rotor spoke support structure is mainly composed of three parts: a hub (1), a rim (2) and a spoke (3). The hub (1) and the rim (2) are both annular structural parts or approximately annular structural parts. The hub (1) is arranged inside the rim (2), the spoke (3) is arranged between the hub (1) and the rim (2), and the two ends of the spoke (3) are respectively connected to the hub (1) and the rim (2).
[0032] Specifically, one end of the spoke condition (3) is tangentially connected to the outer circumferential surface of the hub (1), and the other end of the spoke condition (3) is intersected and connected to the rim (2), and the connection position is located on the inner side of the rim (2). The spoke condition (3) includes at least three clockwise spoke conditions (3.1) and at least three counterclockwise spoke conditions (3.2), that is, a total of at least six spoke conditions (3). The schematic diagram shown in this embodiment shows that the number of spoke conditions (3) is sixteen, and the number of clockwise spoke conditions (3.1) and counterclockwise spoke conditions (3.2) is the same, that is, there are eight clockwise spoke conditions (3.1) and eight counterclockwise spoke conditions (3.2). In actual applications, the number of spoke conditions (3) can be adjusted according to the radial size and load requirements of the generator.
[0033] like Figure 3 As shown, the clockwise spoke condition (3.1) is arranged clockwise around the hub axis (4). Figure 4 As shown, the counterclockwise spoke condition (3.2) is arranged counterclockwise around the hub axis (4).
[0034] like Figure 5As shown, the hub (1) is composed of a shaft seat (1.1) and an independent special-shaped flange (1.2). The independent special-shaped flange (1.2) is arranged around the outer circumferential surface of the shaft seat (1.1), and the shaft seat (1.1) can be used to connect to the shaft of the generator. For example, in some embodiments, the shaft seat (1.1) can be connected to the fixed shaft of the external rotor generator. Furthermore, the spoke condition is connected to the independent special-shaped flange (1.2) of the hub (1), and the spoke condition (3) has at least two connecting surfaces with the independent special-shaped flange (1.2). Conventional flanges have only one connecting surface, which is why the name "special-shaped" flange is used in this patent. The end of the spoke condition (3) that is tangentially connected to the hub (1) is connected to an end face of the independent special-shaped flange (1.2) that is perpendicular to the hub axis (4). As shown Figure 6 As shown, in this embodiment, the independent special-shaped flange (1.2) has two end faces perpendicular to the hub axis (4): a first connection end face and a second connection end face. Figure 7 and Figure 8 From the bird's-eye view, it can be seen that the shape of the entire independent special-shaped flange (1.2) can be regarded as a hexagon, each side of the hexagon is connected to two spokes (3), and the connection surfaces between the adjacent sides of the hexagon and the spokes (3) may not belong to the same plane, and even the connection surfaces between each side of the hexagon and the spokes (3) may be independently located in a plane. Therefore, in some other embodiments, the position of the connection surface between the independent special-shaped flange (1.2) and the spokes (3) can be set according to actual conditions, and it is not necessarily necessary to follow Figure 6 The scheme shown is implemented. The connection method between the independent special-shaped flange (1.2) and the radial condition (3) is welding, lap joint or bolt connection.
[0035] The clockwise spokes (3.1) and the counterclockwise spokes (3.2) are intersected and connected to form nodes. The connection method of the nodes is welding, lap joint, or bolt connection. Although the spokes (3) are divided into clockwise spokes (3.1) and counterclockwise spokes (3.2), and the positions of each spoke (3) are different, all of these spokes (3) are made of profiles, and the materials and cross-sectional shapes of all spokes (3) are the same. In other words, all the required spokes (3) are obtained by repeated production of structures of the same specification.
[0036] The advantages and benefits of the technical solution adopted by the utility model are mainly reflected in the following aspects:
[0037] Different from the large-area continuous metal structure of the conventional technical solution, the utility model adopts a frame structure, which saves more materials, is more economical, and is lighter in weight;
[0038] The rim (2) is supported on the hub (1) by using spokes (3) of uniform specifications, and the structure is simple and clear, which is convenient for production and manufacturing;
[0039] The spoke (3) is tangentially connected to the hub (1). When the support structure is subjected to a torque load, the spoke (3) does not need to bear the derived bending moment load, but only bears a tensile force or a compressive force. For the spoke (3) made of a profile, this force is more reasonable, and the possibility of the inner structure breaking is greatly reduced.
[0040] like Figure 3 and Figure 4 As shown, the clockwise spoke condition (3.1) and the counterclockwise spoke condition (3.2) are evenly arranged around the hub axis (4), and the spoke condition (3) is connected to the independent special-shaped flange (1.2), which also confirms that in this embodiment, the shape of the independent special-shaped flange (1.2) can not only be regarded as a hexagon, but also a regular hexagon. The spoke condition (3) is closely attached to the independent special-shaped flange (1.2) from the tangential direction of the outer circumferential surface of the hub (1) and leads to the rim (2). The spoke condition (3) and the rim (2) are connected by welding, overlapping, or bolting. The structure of the rim (2) can be regarded as an annular structure. In this embodiment, a connection structure matching the end of the spoke condition (3) is also arranged at the position where the rim (2) is connected to the spoke condition (3).
[0041] like Figure 8 As shown, a pull rod (5) is arranged between adjacent clockwise spokes (3.1), and the pull rod (5) is led from a position of the spoke close to the rim (2) to a position where adjacent spokes (3) are intersected and connected. A pull rod (5) is also arranged between adjacent counterclockwise spokes (3.2), and the pull rod (5) is led from a position of the spoke (3) close to the rim (2) to a position where adjacent spokes (3) are intersected and connected.
[0042] The tie rods (5) arranged between the clockwise spoke conditions (3.1) and the tie rods (5) arranged between the counterclockwise spoke conditions (3.2) are intersected and connected in pairs, and the connection method can be welding or overlapping. The main function of arranging these tie rods (5) is to increase the overall rigidity of the entire support structure and reduce deformation after being loaded.
[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower" etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0044] In this utility model, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0045] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A low-speed generator stator and rotor spoke support structure, characterized in that: The wheel hub comprises at least a wheel hub (1), a wheel rim (2) and a spoke (3); the wheel hub (1) and the wheel rim (2) are both annular structural parts, the wheel hub (1) is arranged inside the wheel rim (2), and the spoke (3) is arranged between the wheel hub (1) and the wheel rim (2); One end of the spoke condition (3) is tangentially connected to the outer circumferential surface of the hub (1), and the other end is intersectingly connected to the rim (2); the spoke condition (3) comprises at least three clockwise spoke conditions (3.1) and at least three counterclockwise spoke conditions (3.2), and the number of the clockwise spoke conditions (3.1) and the counterclockwise spoke conditions (3.2) are the same; wherein the clockwise spoke conditions (3.1) are arranged clockwise around the hub axis (4); and the counterclockwise spoke conditions (3.2) are arranged counterclockwise around the hub axis (4); The wheel hub (1) comprises an axle seat (1.1) and an independent special-shaped flange (1.2); the independent special-shaped flange (1.2) is arranged around the outer circumferential surface of the axle seat (1.1); the portion of the spoke (3) connected to the wheel hub (1) is the independent special-shaped flange (1.2), and the spoke (3) has at least two connection surfaces with the independent special-shaped flange (1.2); The clockwise spoke conditions (3.1) and the counterclockwise spoke conditions (3.2) are intersected and connected in pairs.
2. A low-speed generator stator and rotor spoke support structure according to claim 1, characterized in that: The spoke conditions (3) are made of profiles, and the material and cross-sectional shape of all the spoke conditions (3) are the same.
3. A low-speed generator stator and rotor spoke support structure according to claim 1, characterized in that: The clockwise spoke condition (3.1) and the counterclockwise spoke condition (3.2) are evenly arranged around the hub axis (4).
4. A low-speed generator stator and rotor spoke support structure according to claim 1, characterized in that: The clockwise spoke condition (3.1) and the counterclockwise spoke condition (3.2) are staggeredly connected, and the connection method is welding, overlapping, or bolting.
5. The low-speed generator stator and rotor spoke support structure according to claim 1, characterized in that: One end of the spoke condition (3) tangentially connected to the hub (1) is connected to an end face of the independent special-shaped flange (1.2) perpendicular to the hub axis (4), and the spoke condition (3) and the special-shaped flange are connected by welding, lap joint, or bolt connection.
6. A low-speed generator stator and rotor spoke support structure according to claim 1, characterized in that: The spoke condition (3) is closely attached to the independent special-shaped flange (1.2) from the outer circumferential surface of the hub (1) in the tangential direction and leads to the rim (2). The spoke condition (3) is connected to the rim (2) by welding, overlapping or bolting.
7. The low-speed generator stator and rotor spoke support structure according to claim 1, characterized in that: A pull rod (5) is arranged between adjacent clockwise spoke conditions (3.1), and the pull rod (5) is led from a position of the spoke condition (3) close to the wheel rim (2) to a position where adjacent spoke conditions (3) intersect and connect; a pull rod (5) is also arranged between adjacent counterclockwise spoke conditions (3.2), and the pull rod (5) is led from a position of the spoke condition (3) close to the wheel rim (2) to a position where adjacent spoke conditions (3) intersect and connect.
8. A low-speed generator stator and rotor spoke support structure according to claim 7, characterized in that: The pull rods (5) arranged between the clockwise spoke conditions (3.1) and the pull rods (5) arranged between the counterclockwise spoke conditions (3.2) are intersected and connected in pairs.
9. A generator, characterized in that: A low-speed generator stator and rotor spoke support structure comprising the structure described in any one of claims 1 to 8.
10. A wind turbine generator set, characterized in that: A generator comprising the generator described in claim 9.