풍력발전용 비접촉식 하이브리드 타입 동력전달장치에 관한 연구

Abstract

When the wind speed changes rapidly, the wind turbine is stopped for the safety of power system and the mechanical system. At that moment, the wind turbine gearbox is damaged and broken due to high contact load of the gearbox. In addition, the problems such as increasing frictional heat and deterioration of the brake arise because the power of the blades is transmitted directly to the brake. This paper proposes a hybrid magnetic gear shape that solves the problem caused by the contact of the mechanical gear, which is the power transmission device of the wind power generation system, and the power cutoff system. An optimized structure of the hybrid magnetic gear suitable for the wind power generation system is derived through the torque and loss analysis. Two excitation methods were compared and a better one was picked up from the loss analysis. The power density and efficiency have been analyzed and compared for all possible combinations of gear ratio and pole numbers in the selected excitation method. Two dimensional finite element method(FEM) was utilized for the analysis.