| Compared with the conventional wind power generator, high power direct-drive wind turbine with permanent magnet synchronous generator eliminates the heavy gear box, and the low speed wind turbine is directly connected with the permanent magnet generator, which improve the power generation efficiency. Along with the rapid development of science and technology, the advantages of it become more and more obvious gradually.Direct drive wind turbine generator mainly consists of a generator, an impeller, pitch system, cabin, tower, yaw system, braking system and control system. With the increase of the fan unit capacity, mass of wind turbine, volume, height of the wind turbine is also increasing, so the requirements of performance of each structure is also getting higher and higher. The yaw system is wind device of wind turbine, which needs the characteristics of transmission torque and smooth. The mainframe is the important protection of the wind turbine, which needs the characteristics of small size, high intensity, long life. Cabin is the boot of each system of wind turbines, which needs the characteristics of strength, light weight, corrosion resistance.This paper design and research the yaw system, mainframe, cabin of 2MW direct-drive wind turbine as the object respectively. This paper mainly includes the following contents:The design and simulation of four stage planetary gear reducer for yaw system is done. According to the input and output speed of deceleration device, the total transmission ratio is calculated; Secondly, all levels of the planetary gear transmission ratio is distributed, and the number of gear teeth and the modulus is determined, and then the transmission principle is designed and calculated; Thirdly, Pro/E software is used to establish the 3D model of four stage planetary gear reducer, and the assembly design,preliminary design and motion simulation of it is proceeded; Finally, modeling and simulation of kinematics and dynamics for four stage planetary gear reducer is done by ADAMS software. Through simulation results the rationality of transmission ratio distribution is verified, and it’s the reasonable yaw speed is achieved, thus these lay a foundation for design and simulation of yaw control.Second, Structure design and finite element analysis of the main frame of the direct-drive wind turbine is done. Firstly, the structure design of the main frame of the direct drive wind turbine is carried out, and 3D model of the main frame is built by Pro/E software. Secondly, according to the various parameters of the wind turbine, the load of the main frame is calculated. Then, the dynamic and static analysis of the main frame structure system is proceeded by ANSYS/Workbench 15.0. Then the maximum deformation and the maximum stress under the storm conditions is calculated and evaluated.Third, The structure design of fiber reinforced laminate composite cabin and its dynamic and static analysis is carried out. Firstly, the Pro/E software is used to model the cabin; secondly, the composite laminate design is fulfilled by the ACP module on ANSYS /Workbench15.0 platform. Six different overlay program is adopted, and through calculating, analyzing and comparing to the six laminate layups, the better performance of cabin is obtained.Through the research of this paper, the structure of the four stage planetary gear reducer, the main frame and the composite material cabin is designed, which provides an effective design method and lay the necessary theoretical foundation for the structural design of the high power direct drive permanent magnet synchronous wind turbine; it also provides an important reference for improving the structure system of direct drive wind turbine. |
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