GE DS215UPLAG1BZZ01A Matrix switch card

Inside a step motor, the rotor behaves like a mass on a spring, as mentioned above. When commanded to quickly accelerate to a given velocity, the rotor will “ring” about that velocity, oscillating back and forth. As shown in the next drawing, the ringing decays—grows smaller over time—and the rotor eventually settles at the commanded velocity.

Notice that ringing can be caused 

both by accelerating or decelerating to a commanded velocity, and decelerating to a stop. In any of these cases, ringing causes error in rotor position. Ringing is a transient phenomenon (unlike resonance, which occurs during steady state operations). It is a response to a sudden change that we impose on the system, such as “Accelerate to Velocity” or “Stop.” Several problems are associated with ringing. It can cause audible noise; the motor must have a margin of extra torque to overcome the ringing; and longer settling times can decrease throughput.

Common problem

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