Originally Posted by
joeavaerage
Hi,
the technical reason for the vibration is 'inertial mismatch'
The 34 size servos have a substantial rotor with a lot of rotational inertia. If they are coupled to a low rotational inertia load
they will exhibit a mid-band resonance. If the same motor was hooked to a much heavier ballscrew with commensurately higher
rotational inertia the resonance would not ocurr.
You may have noticed that servo manufacturers offer different model servos but all thne same power, say 750W. One model will be low inertia
with another model being medium or high inertia. The intention is that the machine builder will select the model required to give the optimum
inertia ratio.
Its not talked about with steppers, we are by and large amatuers, and inertia ratios are not easy to characterise and use intelligently but the
same physics applies to servos and steppers.
Craig