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 only travel in ideal circles, but their motions as seen from Earth could not become reconciled with circular movement. At around 500 BC, the Greeks created the idea of epicycles, of circles venturing on the circular orbits. With this theory Claudius Ptolemy in the Almagest in 148 AD was able to predict planetary orbital paths. The Antikythera System, circa 80 BC, experienced gearing which was in a position to approximate the moon’s elliptical route through the heavens, and actually to correct for the nine-calendar 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 remedy, is not just another simple planetary gearbox. EP high-tech planetary reducer is a genuine integrated concept, including different functions combined jointly to give you 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-large 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 excellent torque density
Minimum backlash (1 – 3 arc-minutes)
In-Line or proper angle arrangements
This versatile design makes it easy for design engineers to find specific solutions to the most demanding applications.
Parallel shaft Gearmotors
Helical Single-Stage
The S Series style produces this gearmotor particularly effective for fan, blower applications and pump. To meet up the needs of customers in these sectors, the S Series is also available in the feet or flange editions and will be completed with a wide range of Planetary Reducer Gearbox 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 coupled with the S Series: with the breadth of its portfolio, EP provides clients with a superb balance of dynamics, proficiency and cost effectiveness.
The mixture of epicycle gear trains with a planet engaging both a sun gear and a ring gear is named a planetary gear train.[1][2] In cases like this, the ring gear is usually fixed and the sun gear is driven.