A planetary gearbox identifies a gear system in which a number of ‘world’ gears rotate around a central ‘sun’ equipment. 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 provides the output torque. Nevertheless there are examples of the additional combinations, such as the sun gear being fixed and the band providing output torque.
The main advantage of planetary gearboxes are their high power transmission efficiencies. Typicially this can be around simply 3% per stage. Additional to the, the high effiency can be delivered regardless of the compact design giving a big torque to size/weight ratio. Some of this is thanks to the load sharing occurring across the multiple planet gears.
A planetary gearbox identifies a gear system where a number of ‘world’ gears rotate around a central ‘sun’ equipment. Typically, a world carrier is driven by the insight torque which rotates the planets around a set outer ring (sometimes known as the annulus). Therefore drives sunlight gear which then supplies the output torque. Nevertheless there are examples of the various other combinations, like 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. Further to this, the high effiency is delivered regardless of the compact design giving a huge torque to size/weight ratio. Some of this is because of the load sharing occurring 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 between 3.3:1 ~ 1500:1.
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