Epicyclic gears obtain name from their earliest application, that 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 only travel in ideal circles, but their motions as seen from Earth cannot become reconciled with circular motion. At around 500 BC, the Greeks created the thought 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 Mechanism, circa 80 BC, had gearing which was able to approximate the moon’s elliptical path through the heavens, and actually 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 choice, is not just another simple planetary gearbox. EP high-tech planetary reducer is certainly a genuine integrated concept, including many functions combined jointly to provide 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-great output radial stiffness and Tilting Planetary Reducer Gearbox moment
Patented output bearing design
A high-tech planetary equipment train, predicated on REDEX’s differential know-how
ISO 9409-1 end result drive flange for installation pinions, pulleys, couplings, etc.
High input speeds
Superior acceleration and excellent torque density
Minimum backlash (1 – 3 arc-minutes)
In-Line or proper angle arrangements
This versatile design makes it possible for design engineers to find actual answers to the most demanding applications.
Parallel shaft Gearmotors
Helical Single-Stage
The S Series style makes this gearmotor particularly effective for blower applications, fan and pump. To meet the needs of buyers in these sectors, the S Series can be available in the ft . or flange versions and will be completed with a variety of electric motors entirely created 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 consumers with an outstanding balance of dynamics, price effectiveness and efficiency.
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 cases like this, the ring equipment is usually fixed and sunlight gear is driven.