Planetary reduction box, small size, planetary reduction box body 42mm diameter brushless reduction motor. A Brushless Geared Motor planetary reduction box typically refers to a motor that is integrated with a gearbox or gear reduction system. The gearbox is used to reduce the motor’s speed while increasing torque. It consists of three main components: a sun gear in the center, multiple planet gears that revolve around the sun gear, and an outer ring gear. The planetary gearbox is integrated with the brushless motor to form a compact and efficient geared motor system.