An epicyclic gear train (also known as planetary gear) contains two gears mounted so that the centre of one equipment revolves around the centre of the other. A carrier links the centres of both gears and rotates to transport one gear, called the earth gear or planet pinion, around the various other, called sunlight gear or sunlight wheel. The earth and sunlight gears mesh to ensure that their pitch circles roll without slip. A point on the pitch circle of the earth equipment traces an epicycloid curve. In this simplified case, the sun gear is set and the planetary equipment(s) roll around the sun gear.
An epicyclic gear train can be assembled so the planet equipment rolls 
on the inside of the pitch circle of a set, outer gear ring, or ring equipment, Planetary Reducer Gearbox sometimes called an annular equipment. In this instance, the curve traced by a spot on the pitch circle of the earth is a hypocycloid.
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 normally fixed and the sun gear is driven.
Epicyclic gears get their name from their earliest program, that was the modelling of the motions of the planets in the heavens. Believing the planets, as everything in the heavens, to be perfect, they could only travel in ideal circles, but their motions as viewed from Earth cannot become reconciled with circular movement. At around 500 BC, the Greeks developed the thought of epicycles, of circles traveling 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 able to approximate the moon’s elliptical path through the heavens, and also to improve for the nine-calendar year precession of that path.[3] (The Greeks could have seen it not as elliptical, but instead as epicyclic motion.)
EP, a versatile and multi-use solution, is not merely another simple planetary gearbox. EP high-tech planetary reducer is certainly a true integrated concept, including many functions combined together to give you 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 moment
Patented output bearing design
A high-tech planetary gear train, predicated on REDEX’s differential know-how
ISO 9409-1 outcome drive flange for installation pinions, pulleys, couplings, etc.
High input 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 possible 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 pump, fan and blower applications. To meet the needs of consumers in these sectors, the S Series can be available in the ft . or flange editions and may be completed with an array of electric motors entirely manufactured by EP. Asynchronous motors both IEC and small (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 cost effectiveness, dynamics and efficiency.