The basic principle of wind power generation is that the kinetic energy of the wind is converted into mechanical energy through a wind turbine, [1] and then the generator is driven to generate electricity and converted into electrical energy. The dominant wind turbine is generally a horizontal-axis wind turbine, which is composed of blades, hubs, speed-increasing gearboxes, generators, main shafts, yaw devices, control systems, towers and other components. The function of the wind wheel is to convert wind energy into mechanical energy. It consists of blades with excellent aerodynamic performance mounted on the hub. The low-speed rotating wind wheel is increased by a speed-increasing gearbox and transmits power to the generator. [2] The above-mentioned components are arranged in the nacelle, and the entire nacelle is supported by the tower. In order to effectively use wind energy, the yaw device controls the yaw motor by the controller according to the wind direction signal measured by the wind direction sensor, and drives the small gear that engages with the large gear on the tower to rotate, so that the nacelle is always facing the wind. As the gearbox is a component with a high rate of overload and premature failure in MW-class wind turbines, foreign countries have begun to develop a direct drive type wind turbine (also known as gearless wind turbine), which uses many In order to track the best blade tip speed ratio and enable the wind turbine to obtain the best power output within a larger wind speed range, the speed or power must be adjusted by the direct connection of the first-stage asynchronous motor and the impeller for driving, eliminating the need for gears. There are two commonly used adjustment methods: one is stall adjustment, and the other is pitch adjustment. The blade can rotate around the axis on the blade to change the aerodynamic data of the blade to achieve power adjustment.