The diagram shows the driving torque required to generate a specific force (without allowing for the screw bearing).
Example
At 2 mm lead, torque of only 3.4 Nm is needed to generate 10 kN. At 1 mm lead this is reduced to 1.9 Nm.
The diagram shows the efficiency curve of an ASCA servo screw with 1 mm and 2 mm lead.
It is clear that very high efficiency levels can be obtained even at small leads. Due to the pre-loading of the planetary rollers, the efficiency is relatively low in the lower force ranges but rises as the force increases.
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