How Do Planetary Gears Increase Torque?

How Do Planetary Gears Increase Torque? A planetary gearhead takes a high-speed, low-torque input, say from an electric motor, then increases torque and reduces speed at the output by the gearhead ratio. This lets motors run at higher, more-efficient rpms in equipment that operates at low speeds. Are planetary gears Backdrivable? A: Yes, Micron planetary