Planetary gearboxes are made up of a series of gears - the planets - that revolve around a central (sun) gear, with an outer ring gear creating the orbit to integrate meshing.. They are extremely efficient even at low speeds, and offer high gear ratios. Planetary gearboxes transmit three times the torque of a similar-sized conventional spur gearbox - which is noisy and carries a great deal of meshing stress - by spreading the load across the planets..
Rather
