ABSTRACT

Heavy, large and robust supporting structures are needed to keep the airgap clearance of direct-drive multi-MW wind turbine electrical generators open and stable. As rotating pieces of machinery, generators vibrate when their natural frequencies are excited introducing potentially large amplitude oscillations due to the forces acting on them that could cause structural fatigue, noise and, in the worst-case scenario, their sudden collapse. A novel procedure for cost-effective and dynamically efficient structural design of a generator has been developed through a series of different finite element studies for a proposed 3MW machine with a conical rotor structure working under extreme conditions. Following a parametric approach coupled with the use of a topology optimisation tool it was demonstrated that the structural mass and dynamic response of the machine can be minimised, while complying with the deflection requirements.

摘要

需要重型、大型和坚固的支撑结构来保持直驱多兆瓦风力涡轮发电机的气隙间隙打开和稳定。作为旋转的机械部件，发电机在其固有频率受到激发时会振动，由于作用在它们上的力可能导致结构疲劳、噪音以及在最坏的情况下突然倒塌，从而引入潜在的大振幅振荡。通过一系列不同的有限元研究，针对在极端条件下工作的具有锥形转子结构的拟议 3MW 机器开发了一种用于发电机的成本效益和动态高效结构设计的新程序。