— 6-6 —
u
Example 4 : Load is connected using sprocket chain or gear mechanism.
(There may be backlash.)
Figure 6-6 : Using Sprocket Chain Or Gear Mechanism
“Dummy”
1)
For smooth drive, the inertia of directly attached load should be:
Jd = Ji × 0.2
where
Jd : inertia of directly attached load
Ji : inertia of indirectly attached load
Example:
l
When the inertia of indirectly attached load (Ji) is 0.5 kg·m
2
, the inertia of directry
attached load (Jd) shall be :
Jd = 0.5 × 0.2
= 0.1 kg·m
2
2)
When driving a speed reduction;
Ji
r
2
× Jd
≤
5
where
Jd
: inertia of directly attached load
Ji
: inertia of indirectly attached load
r
: speed reduction ratio
Example:
l
When
inertia of indirectly attached load Ji : 20 kg·m
2
speed reduction ration r
: 1 : 3
the inertia of directry attached load (Jd) shall be:
Ji
Jd
≥
r
2
× 5
20
≥
3
2
× 5
≥
0.444 kg·m
2
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