2-4 Duty Cycles
2-2
Selection of the RSF supermini Series
2-4 Duty Cycles
When the operation pattern (duty cycle) is such that the actuator starts and stops repeatedly, starting
current and braking current flow through the motor at high frequency and the actuator generates heat.
Accordingly, examine whether or not the generated heat can be accommodated.
The study is as follows:
Actuator speed
Calculate the required RSF supermini actuator
speed (r/min) to drive the load.
For linear motion, convert with the formula below:
Rotary speed (r/min) =
Liner speed (mm/min)
Pitch of screw(mm)
Select a reduction ratio from [30], [50] and [100] of
an RSF supermini actuator of which the maximum
speed is more than the required speed.
Load moment of inertia
Calculate the load moment of inertia driven by the RSF supermini series actuator.
For the calculation methods, refer to [Appendix 1 Conversion of unit] (Page A-1).
Tentatively select an RSF supermini actuator referring to section [2-1 Allowable load moment of inertia]
(P2-1) with the calculated value.
Calculating load torque
Calculate the load torque as follows:
Rotary motion
The torque for the rotating mass [W] on the friction ring of radius [r] as
shown in the figure to the right.
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