rotary axis configuration question

Hi, everyone:
I tried to understand the basic knowledge of CIP motion control axis configuration.
we have one rotary axis (kinetix350) in our system, this axis uses MPL-B330P-M motor, i don't understand the system inertia, in our case, the system inertia equals to motor inertia, why the units are different? i don't know where is the system inertia coming from, is there any formula to calculate it or coming from successful autotune?
Thanks in advance!

system inertia = 1/ system acceleration. where is system acceleration coming from? from successful autotune?
thanks!

mike3475 said:

system inertia = 1/ system acceleration. where is system acceleration coming from? from successful autotune?
thanks!

Click to expand...

1/ system acceleration is not an inertia. Look up the definition for rotational inertia. System inertia appears to be a "made up" term.
Didn't you see my post above? Torque = rotational_inertia*angular_acceleration. If you rearrange this you get angular_acceleration = Torque / rotational inertia.
You know the rotational inertia and the motor. The motor should have a maximum torque with which the maximum rotational can be calculated. This is basic. Ask Rockwell about their screwed up terms.


An auto tune will provide the open loop frequency and bandwidth or time constant of the motor and load.

this system is not new installation and is existing for 6 years.