A planetary gearbox is a type of gear system that consists of spur gearbox. In a planetary gear (also known as a cyclic gear), a central gear called a sun gear acts as the input and drive of the assembly. Three or more "drive" gears (called planets) rotate around the sun gear. for more details about planetary gearbox read what is planetary gearbox blog post.
Although planetary gearboxes have different models and series, there are some common components in all of them:
compartment
Solar pinion
Mechanical connection to the motor shaft
planetary carrier