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