Epicyclic gears get their name from their earliest application, which 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 only travel in perfect circles, but their motions as seen from Earth could not become reconciled with circular movement. 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 was able to predict planetary orbital paths. The Antikythera Mechanism, circa 80 BC, acquired gearing which was able to approximate the moon’s elliptical path through the heavens, and actually to correct for the nine-yr precession of that route.[3] (The Greeks could have seen it much less elliptical, but instead as epicyclic motion.)
EP, a versatile and Planetary Reducer Gearbox multi-use solution, is not merely another simple planetary gearbox. EP high-tech planetary reducer can be a genuine integrated concept, including countless functions combined alongside one another to provide a complete sub-assembly to the virtually all demanding machines.
EP is the ultimate high-tech servo-reducer, specially dedicated to designs requiring:
Superior output torsional stiffness
Ultra-huge output radial stiffness and Tilting moment
Patented output bearing design
A high-tech planetary equipment train, predicated on REDEX’s differential know-how
ISO 9409-1 output drive flange for mounting pinions, pulleys, couplings, etc.
High input speeds
Superior acceleration and superb torque density
Minimum backlash (1 – 3 arc-minutes)
In-Line or right angle arrangements
This versatile design makes it easy for design engineers to find actual solutions to the most demanding applications.
Parallel shaft Gearmotors
Helical Single-Stage
The S Series style may make this gearmotor particularly effective for blower applications, pump and fan. To meet the needs of clients in these sectors, the S Series is also available in the foot or flange editions and will be completed with a variety 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) can be in conjunction with the S Series: with the breadth of its portfolio, EP provides customers with an outstanding balance of dynamics, productivity and cost effectiveness.

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 case, the ring equipment is generally fixed and sunlight gear is driven.