GE DS215UDSAG1A Serial control card

In this appendix we will discuss resonance and ringing in step motors. This information will help you configure the ZETA6104’s damping features—antiresonance, active damping, and electronic viscosity. All step motors have natural resonant frequencies, due to the nature of their mechanical construction. Internally, the rotor acts very similarly to a mass suspended on a spring—it can oscillate about its commanded position. Externally, the machine, mounting structure, and drive electronics can also be resonant, and interact with the motor. During a move, two types of problems can arise from these causes: resonance and ringing transients.

Resonance (Steady State Response) 

Resonance is a steady state phenomenon—it occurs when the motor’s natural resonant frequencies are excited at particular velocities. It is not caused by transient commands that we give the motor. If you slowly increase your motor’s speed from zero to 20 rps, for example, you may notice “rough” spots at certain speeds. The roughness is resonance; it is depicted in the next drawing.

Common problem

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