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9
5.
How To Set Rotation Time
Due to inertia of the load, even a small torque generated by Rotary Actuator may cause damage
to the shaft and internal parts. Therefore, consider the inertia of the load and kinetic energy to set rotarion
time.
5-1
.
Moment of Inertia
①
Moment of inertia is effort required to turn an object, in other words, effort required to stop it.
When an object is moved by Rotary Actuator, the object has inertia force. Large impact (kinetic energy)
is applied to Rotary Actuator when Actuator stops at the stroke end. Kinetic energy can be calculated by
using the formula below.
E = 1/2 x I x ω
2
E
:
Kinetic energy (J)
I
:
Moment of inertia (kg
.
m
2
)
ω
:
Angular speed
(rad/s)
②
Since allowable kinetic energy Rotary Actuator is limited, of rotation time can be obtained by finding
moment of inertia. How to find moment of inertia is described below.
Moment of inertia can be indicated by the formula below.
I = m x r
2
m:
:
Mass (kg)
This is moment of inertia to rotation axis of an object with mass m in the distance from the rotation axis.
2020-08-27 13:47
DI006501