Determine values of equation variables – Rockwell Automation AK DBU - Dynamic Braking Unit 600/690 VAC User Manual
Page 42
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C-4
Design Information
Step 1 Total
Inertia
J
T
=
Total inertia reflected to the motor shaft
(kg-m
2
or WK
2
in lb.-ft.
2
)
J
m
=
Motor inertia (kg-m
2
or WK
2
in lb.-ft.
2
)
GR
=
Gear ratio for any gear between motor and load
(dimensionless)
If the gear ratio is 2:1 then
J
L
=
Load inertia (kg-m
2
or WK
2
in lb.-ft.
2
)
1.0 lb.-ft.
2
= 0.042 kg-m
2
Calculate Total Inertia:
Record Total Inertia:
Determine Values of Equation Variables
J
T
=
J
T
J
m
GR
2
J
L
×
(
)
+
=
GR
Load Speed
Motor Speed
-----------------------------
=
GR
1
2
--
0.5
=
=
J
T
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[
]
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Ч
(
)
+
=
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