What is a reasonable inertia ratio between a motor and load?
A. This depends on the acceleration that you expect out of a system. With stepper motors, it is best to target a 1:1 inertial load to motor ratio to expect good acceleration. For servo motors, target for a 5:1 mismatch. Note: gearheads are a good option to reduce the ratio mismatch because the gearhead reduces the reflected inertia by the square of the gear ratio.
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