You can tie a ring-shaped magnet with a string and put it in the gearbox to suck it up. I asked, but before the magnet could come down, it got sucked into the gear and couldn't come down.
Gearboxes are widely used in wind turbines and are often used in wind turbines, and they are an important mechanical component, the main function of the gearbox is to transmit the power generated by the wind wheel under the action of the wind to the generator and obtain the speed of corresponding rotation. Usually, the speed of the wind wheel is very low, which is far from the speed required by the generator for electricity generation. It must be achieved through the speed-increasing effect of the gear pair of the gearbox, which is why the gearbox is also called a. speed increase box. [1]