A planetary gearbox refers to a gear system in which one or more ‘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). Therefore drives the sun gear which then provides the output torque. However there are examples of the other combinations, such as the sun gear being set 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. Further to this, the high effiency can be delivered regardless of the compact design giving a sizable torque to size/weight ratio. A few of this is thanks to the load sharing occurring over the multiple planet gears.
A planetary gearbox identifies a gear system where one or more ‘planet’ 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 known as the annulus). This in turn drives the sun gear which then supplies the output torque. Nevertheless there are types of the additional combinations, like the sun gear being set and the ring providing output torque.

The main advantage of planetary gearboxes are their high power transmission efficiencies. Typicially this is often around simply 3% per stage. Additional to this, the high effiency is delivered regardless of the compact style giving a big 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 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 gear ratios range from 3.3:1 ~ 1500:1.

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