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The inertia of complex concentric rotating parts is calculated by breaking the part up into simple
rotating cylinders, calculating their individual inertia, and adding them together.
J = J
+ J
1
Total
Direct Drive
For direct drive loads, there are no mechanical linkages.
Application Notes
+ J
2
3
Speed:
Inertia:
Torque:
Where:
Page 8
Material Densities
Material
Aluminum
Brass
Bronze
Copper
Steel (cold rolled)
Plastic
W
=
W
M
L
J
=
J
+ J
T
L
M
T
=
T'
L
W
=
motor speed (rpm)
M
W
=
load speed (rpm)
L
J
=
total system inertia (lb-in-s
T
J
=
load inertia (lb-in-s
L
J
=
motor inertia (lb-in-s
M
T
=
load torque at motor shaft (lb-in)
L
T'
=
load torque (lb-in)
lb/in
3
0.096
0.300
0.295
0.322
0.280
0.040
)
2
)
2
)
2
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