Offshore Wind Machine Maglev Yawing Device Design And Yaw Control

Currently, offshore wind power which is an important direction of the wind power, is vigorously developed all over the world. The development of China’s offshore wind power is speeding up too. Especially in the southeast coastal regions where electricity load increases continually, offshore wind power is a good choice to alleviate the electric pressure. Among all kinds of large wind turbines used in offshore wind power, horizontal axis wind turbine absolutely is the mainstream. Active yaw device which is an integral part of the horizontal axis wind turbine, affects the life and work efficiency of the horizontal axis wind turbine directly or indirectly. Most of active yaw uses the gear-motor type yaw bearing and yaw transmission device. After years of application, many problems has been found, for example, containing many parts and being heavy, more complicated structures, needing regular replacement of oil and grease, frequent maintenance, multiple motors driving, needing more space, more large eccentric torque the nose to bear in the yaw process leads to tower bending and blade tremor, and so on.Through the study of the problems of traditional yaw device mentioned above, this paper proposes a new horizontal axis offshore wind turbine yaw device, this device is a combination of magnetic suspension and disc motor. The new yaw device is to improve the shortcomings of the current active yaw system. It contains some features such as, a more simple structure, convenience to maintenance, no lubrication, long life and not appear the tower lateral bending and blade tremor in the case of the fan running.There is the need for many extensive researches on offshore wind magnetic levitation yaw device. This paper does the following research aspects based on the reference to previous analyses and researches.1)Referencing the motor design process and special motor design, and combined with design methods of the linear and the synchronous motor and the disc motor,and combined with the design principles for magnetic levitation, we designs the disc magnetic levitation motor;2)Using finite element analysis software ANSYS, I analyze the new designed motor and do the finite element analysis to verify the magnetic field distribution of the motor;3)Setting a dynamic mathematical model of rotating device and magnetic suspension devices, and combined with the actual listing the relationship between the rotating torque and the turbine weight, and listing the relationship between the turbine torque and phase current, and AC/DC interactions;4)Experimental models of rotating suspension control hardware circuit control chip intended to select the DSP the TMS28335, and the frequency converter to adjust the speed, the suspension is controlled by the DC power supply;5) Verify the feasibility of the design model.