[mcv300]

If a motor has inertia of 0.2 kgcm^2 paired with a reduction gearbox of 1:10 with 0.1 kgcm^2 inertia

How much is the total inertia now ?
a) 30 kgcm^2
b) 20.1 kgcm^2

Thank you

[mike_Kilroy]

neither....

c) 0.3kgcm2

gearbox inertias are given at the motor shaft side, so the motor sees .1.

the motor is .2, so the total is .3

missing is the LOAD inertia: IT goes thru the gearbox and gets reduced by the square of the ratio, or reduced by 100 in your case.

[mcv300]

Thank you Mike,

very valuable information for me

[mike_Kilroy]

load inertia reflected to the motor is most important also.... consider playing with free Motioneering to see how all inertias interact for different type mechanical systems:

MOTIONEERING® | Kollmorgen