Epicyclic gears get their name from their earliest application, which was the modelling of the movements of the planets in the heavens. Believing the planets, as everything in the heavens, to end up being perfect, they could just travel in perfect circles, but their motions as seen from Earth cannot end up being reconciled with circular motion. At around 500 BC, the Greeks invented the idea of epicycles, of circles travelling 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, got gearing which was able to approximate the moon’s elliptical path through the heavens, and even to improve for the nine-year precession of that path.[3] (The Greeks would have seen it much less elliptical, but rather as epicyclic motion.)
EP, a versatile and multi-use answer, is not just another simple planetary gearbox. EP high-tech planetary reducer is certainly a true integrated concept, including different functions combined mutually to offer a complete sub-assembly to the virtually all demanding machines.
EP is the ultimate high-tech servo-reducer, specially focused on designs requiring:
Superior output torsional stiffness
Ultra-high 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 Planetary Reducer Gearbox speeds
Superior acceleration and exceptional torque density
Minimum backlash (1 – 3 arc-minutes)
In-Line or correct angle arrangements
This versatile design helps it be easy for design engineers to find actual answers to the most demanding applications.
Parallel shaft Gearmotors
Helical Single-Stage
The S Series style produces this gearmotor particularly effective for pump, fan and blower applications. To meet the needs of buyers in these sectors, the S Series can be 
available in the ft . or flange versions and can be completed with a wide selection of electric motors entirely made by EP. Asynchronous motors both IEC and compact (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 provides buyers with a superb 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 equipment is normally fixed and sunlight gear is driven.