Epicyclic gears obtain name from their earliest app, that was the modelling of the actions of the planets in the heavens. Believing the planets, as everything in the heavens, to become perfect, they could just travel in perfect circles, but their motions as seen from Earth could not be reconciled with circular motion. At around 500 BC, the Greeks developed the idea of epicycles, of circles venturing on the circular orbits. With this theory Claudius Ptolemy in the Almagest in 148 AD could predict planetary orbital paths. The Antikythera System, circa 80 BC, acquired gearing which was in a position to approximate the moon’s elliptical path through the heavens, and actually to correct for the nine-season precession of that route.[3] (The Greeks would have seen it not as elliptical, but rather as epicyclic motion.)
EP, a versatile and multi-use option, is not simply another simple planetary gearbox. EP high-tech planetary reducer can be a genuine integrated concept, including several functions combined collectively to offer a complete 
sub-assembly to the virtually all demanding machines.
EP is the best high-tech servo-reducer, specially focused on designs requiring:
Superior output torsional stiffness
Ultra-excessive output radial stiffness and Tilting moment
Patented output bearing design
A high-tech planetary equipment train, based on REDEX’s differential know-how
ISO 9409-1 result drive flange for mounting pinions, pulleys, couplings, etc.
High input speeds
Superior acceleration and wonderful torque density
Minimum backlash (1 – 3 arc-minutes)
In-Line or correct angle arrangements
This versatile design makes it easy for design engineers to find specific answers to the most demanding applications.
Parallel shaft Gearmotors
Helical Single-Stage
The S Series design may make this gearmotor particularly effective for fan, pump and blower applications. To meet the needs of buyers in these sectors, the S Series can be available in the feet or flange variants and may be completed with an array of electric motors entirely created by EP. Asynchronous motors both IEC and small (B-BE-BX/M-ME-MX), servomotors (BMD) and reluctance motors (BSR) could be in conjunction with the S Series: with the breadth of its portfolio, EP Planetary Reducer Gearbox provides clients with an outstanding balance of efficiency, price effectiveness and dynamics.
The mixture of epicycle gear trains with a planet engaging both a sun gear and a ring gear is called a planetary gear train.[1][2] In this instance, the ring gear is usually fixed and sunlight gear is driven.