User guide

Series 215 Rotary Actuator Product Manual
58
Determining Maximum Rotational Inertia (JT)
Operation
1. Calculate the total rotational inertia by using the following formula:
J
T
= J
R
+ J
F
+ J
D
+ J
S
Where:
J
R
= rotational inertia for actuator (“Rotational Inertia for Actuator
Components”)
JF = rotational inertia for flange adapter options (“Rotational Inertia for
Actuator Components”)
JD = rotational inertia for diaphragm flexure (“Rotational Inertia for
Actuator Components”)
J
S
= rotational inertia value for specimen configurations (Step 2)
2. To determine J
S,
refer to Substeps A, B, and C and select the formula
appropriate to the specimen configuration. Refer to the “Rotational Inertia
Calculations” figure and note that in each formula, m is equal to the mass of
the specimen.
Rotational Inertia Calculations
A. If the specimen is a regular solid
mass, use the following formula to
calculate J
S
:
B. If the specimen is a regular hollow
mass, use the following formula to
calculate J
S
:
C. If the specimen is an offset
mass, use the following formula to calculate
J
S
:
215.45 171 0.0500 273 0.0799 960 0.281
215.51 284 0.0831 737 0.216 1400 0.410
Rotational Inertia for Actuator Components