NSK MEGATORQUE M-ESA-Y2005V25 - Page 85

— 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·m2, the inertia of directry
attached load (Jd) shall be :
Jd = 0.5 × 0.2
= 0.1 kg·m2
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·m2
speed reduction ration r : 1 : 3
the inertia of directry attached load (Jd) shall be:
Ji
Jd ≥
r2 × 5
20
≥
32 × 5
≥
0.444 kg·m2
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com