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A servo system’s inertia ratio is a commonly misunderstood parameter. When dealing with stepper motors, articles and tutorials often instruct the control engineer to select a motor that will match the ratio as close to 1:1 as possible. The reason is that stepper motors are prone to de-synchronization issues and torque losses, and need to be sized to match the load to overcome these challenges.
Click on the link below to download the full article (Kollmorgen Technical Bulletins) http://www.electromate.com/db_support/attachments/KOL_MotorInertiaMismatch_Brief_08_12_10.pdf
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