Stator base of megawatt-level semi-direct-drive wind driven generator

Abstract

The utility model relates to a stator frame of a megawatt semi-direct drive type wind driven generator, which comprises a DE end plate and an NDE end plate, a plurality of side plates are uniformly arranged between the DE end plate and the NDE end plate along the circumferential direction, and the plurality of side plates form a hollow cavity for accommodating a generator stator assembly between the DE end plate and the NDE end plate. According to the technical scheme, the structure is reasonable, and the problems of the structural form and the manufacturing process of an existing semi-direct-drive type wind driven generator stator frame can be solved, namely, the problems that the welding process is complex, cost is high, and deformation is prone to occurring can be solved.

Description

Technical Field

[0001] The utility model relates to a stator frame for a generator, in particular to a stator frame for a megawatt - class semi - direct - drive wind turbine generator. Background Art

[0002] In recent years, the semi - direct - drive technology route has become one of the mainstream technology routes for large - scale wind turbine generator equipment. There are generally problems in the structural form and manufacturing process of existing semi - direct - drive generator stator frames. Existing semi - direct - drive generator frames mainly include frame - type and cylindrical - type. Typical representatives of frame - type stator frames are the frame - type stator frames of Vestas' Enventus platform wind turbine products and the multi - layer frame - type stator frames of Shanghai Electric semi - direct - drive generators. The above - mentioned frames generally have complex welding processes, resulting in high costs. Although the manufacturing process of cylindrical - type stator frames is simple, there are problems of easy deformation (that is, weak overall stiffness. After precision machining and being unloaded from the machine tool, there are obvious oval problems at both end flanges). Summary of the Invention

[0003] To solve the above - mentioned technical problems, the purpose of the utility model is to provide a stator frame for a megawatt - class semi - direct - drive wind turbine generator, which includes a DE end plate and an NDE end plate. A number of side plates are evenly arranged in the circumferential direction between the DE end plate and the NDE end plate. The number of side plates forms a hollow cavity for accommodating the generator stator assembly between the DE end plate and the NDE end plate.

[0004] Preferably, the side plates are flat plate structures. Eight side plates are evenly arranged in the circumferential direction between the DE end plate and the NDE end plate, that is, the cross - section of the hollow cavity is a regular octagon.

[0005] Preferably, two stator core fixing flange plates are arranged at intervals near the DE end plate of the hollow cavity. The two stator core fixing flange plates form a stator core fixing position in the hollow cavity.

[0006] Preferably, a brake fixing flange is arranged near the NDE end plate of the hollow cavity.

[0007] Preferably, each side plate has an air outlet hole between the DE end plate 1 and the stator core fixing flange plate, and each side plate has an air outlet hole between the NDE end plate and the stator core fixing flange plate.

[0008] Preferably, at least two relatively arranged side plates have air inlet holes between the two stator core fixing flange plates.

[0009] Preferably, adjacent two side plates are connected by welding, and the stator core fixing flange plate and the brake fixing flange are both welded and arranged in the hollow cavity.

[0010] With the above solution, the utility model has at least the following advantages:

[0011] The technical solution of this application overcomes the problems in the structural form and manufacturing process of the stator frame of the existing semi-direct drive wind turbine, namely, the complex welding process with high cost, easy deformation, etc.

[0012] The stator frame of the technical solution of this application is mainly formed by machining after welding the DE end plate, NDE end plate, several flange plates and several side plates, which is a typical frame plate structure. Due to the existence of the DE end plate, NDE end plate and several flange plates, the overall stiffness of the frame is good and it is not easy to deform. At the same time, several side plates in the circumferential direction can well transfer the generator electromagnetic torque, braking torque and barring torque from the stator core fixing flange, brake fixing flange and NDE end plate to the DE end flange of the motor and the flange of the rear end cover of the gearbox, and the overall load transmission is good;

[0013] The DE end plate, NDE end plate and several flange plates can be cut from steel plates by means of flame cutting, laser cutting, etc., and can also be welded in sections to reduce costs.

[0014] Due to the simple structure, most of the main welds are straight welds and the welding accessibility is good, so the overall structural rigidity of the frame is good and the subsequent machining is easier.

[0015] The above description is only an overview of the technical solution of the utility model. In order to be able to understand the technical means of the utility model more clearly and to be implemented in accordance with the content of the specification, the following takes the preferred embodiment of the utility model and combines with the attached drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show a certain embodiment of the present utility model, so it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0017] Figure 1 is a three-dimensional structural schematic diagram of the stator frame of a megawatt-level semi-direct drive wind turbine of this application;

[0018] Figure 2 is another three-dimensional structural schematic diagram of the stator frame of a megawatt-level semi-direct drive wind turbine of this application;

[0019] Figure 3 is a three-dimensional structural schematic diagram of the stator core fixing position of this application;

[0020] Figure 4 It is a schematic structural relationship diagram between the stator core fixing flange plate and the brake fixing flange of the present application.

[0021] In the figure: 1 DE end plate, 2 NDE end plate, 3 side plate, 4 stator core fixing flange plate, 5 stator core fixing position, 6 brake fixing flange, 7 air outlet hole, 8 air inlet hole. Specific embodiments

[0022] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0023] See Figures 1 to 4 , a megawatt-class semi-direct-drive wind turbine stator frame according to a preferred embodiment of the present utility model includes a DE end plate 1 and an NDE end plate 2. A plurality of side plates 3 are uniformly arranged along the circumferential direction between the DE end plate 1 and the NDE end plate 2. The plurality of side plates 3 form a hollow cavity for accommodating the generator stator assembly between the DE end plate 1 and the NDE end plate 2.

[0024] Preferably, the side plate 3 is a flat plate structure. Eight side plates 3 are uniformly arranged along the circumferential direction between the DE end plate 1 and the NDE end plate 2, that is, the cross-section of the hollow cavity is a regular octagon.

[0025] Preferably, two stator core fixing flange plates 4 are arranged at intervals near the DE end plate 1 of the hollow cavity. The two stator core fixing flange plates 4 form a stator core fixing position 5 in the hollow cavity.

[0026] Preferably, a brake fixing flange 6 is arranged near the NDE end plate 2 of the hollow cavity.

[0027] Preferably, an air outlet hole 7 is opened on each side plate 3 between the DE end plate 1 and the stator core fixing flange plate 4, and an air outlet hole 7 is opened on each side plate 3 between the NDE end plate 2 and the stator core fixing flange plate 4.

[0028] Preferably, at least two relatively arranged side plates 3 are provided with air inlet holes 8 between the two stator core fixing flange plates 4.

[0029] Preferably, adjacent two side plates 3 are connected by welding, and the stator core fixing flange plate 4 and the brake fixing flange 6 are both welded and arranged in the hollow cavity.

[0030] It is worth mentioning that when the side plate 3 is processed, it can be made into a bent part only by using four plates, further reducing the welding process, and at the same time, it does not affect normal use and processing. Structures such as the air holes 7 and the air inlet holes 8 can be prefabricated in the blanking process before bending. After being positioned by the welding fixture, the whole is welded, and then through processes such as stress relief annealing, primer, machining, and topcoat, the finished product can be obtained.

[0031] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A stator frame of a megawatt - class semi - direct - drive wind turbine, characterized in that: It includes a DE end plate (1) and an NDE end plate (2). A number of side plates (3) are evenly arranged in the circumferential direction between the DE end plate (1) and the NDE end plate (2). The number of side plates (3) forms a hollow cavity for accommodating the generator stator assembly between the DE end plate (1) and the NDE end plate (2).

2. The stator frame of a megawatt - class semi - direct - drive wind turbine according to claim 1, wherein: The side plate (3) is a flat plate structure. Eight side plates (3) are evenly arranged in the circumferential direction between the DE end plate (1) and the NDE end plate (2), that is, the cross-section of the hollow cavity is a regular octagon.

3. A stator frame of a megawatt - class semi - direct - drive wind turbine according to claim 1, characterized in that: Two stator core fixing flange plates (4) are arranged at intervals near the DE end plate (1) of the hollow cavity. The two stator core fixing flange plates (4) form a stator core fixing position (5) in the hollow cavity.

4. A stator frame of a megawatt-level semi-direct drive wind turbine according to claim 1, characterized in that: A brake fixing flange (6) is arranged near the NDE end plate (2) of the hollow cavity.

5. A stator frame of a megawatt - class semi - direct - drive wind turbine according to claim 1 or 2 or 3 or 4, characterized in that: Each side plate (3) is provided with an air outlet hole (7) between the DE end plate (1) and the stator core fixing flange plate (4). Each side plate (3) is provided with an air outlet hole (7) between the NDE end plate (2) and the stator core fixing flange plate (4).

6. A stator frame of a megawatt - class semi - direct - drive wind turbine according to claim 5, characterized in that: At least two relatively arranged side plates (3) are provided with air inlet holes (8) between the two stator core fixing flange plates (4).

7. A stator frame of a megawatt - class semi - direct - drive wind turbine according to claim 1 or 2 or 3 or 4, characterized in that: Adjacent two side plates (3) are connected by welding. The stator core fixing flange plate (4) and the brake fixing flange (6) are both welded and arranged in the hollow cavity.

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