A planetary gearbox identifies a gear system where one or more ‘planet’ gears rotate around a central ‘sun’ gear. Typically, a planet carrier is driven by the insight torque which rotates the planets around a fixed outer ring (sometimes referred to as the annulus). This in turn drives the sun gear which then supplies the output torque. However there are examples of the other combinations, such as the sun gear being fixed and the ring providing output torque.
The main benefit of planetary gearboxes are their high power transmission efficiencies. Typicially this could be around just 3% per stage. Additional to the, 
the high effiency is definitely delivered despite the compact style giving a big torque to size/weight ratio. Some of this is because of the load sharing that occurs over the multiple planet gears.
A planetary gearbox refers to a gear system where one or more ‘world’ gears rotate around a central ‘sun’ equipment. Typically, a world carrier is driven by the insight torque which rotates the planets around a fixed outer ring (sometimes known as the annulus). This in turn drives the sun gear which then provides the output torque. However there are types of the various other combinations, such as the sun gear being fixed and the ring providing output torque.
The main benefit of planetary gearboxes are their high power transmission efficiencies. Typicially this can be around simply 3% per stage. Additional to this, the high effiency is definitely delivered despite the compact style giving a large torque to size/weight ratio. Some of this is thanks to the load sharing occurring across the multiple planet gears.
Reliable Small Planetary Gearbox
EP Motor’s little planetary gearbox comes in 7 different sizes with diameters of 16mm, 22mm, 26mm, 28mm, 32mm, 36mm, and 45mm, each consisting with mono and multi-stages, and the apparatus ratios range between 3.3:1 ~ 1500:1.
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