Electricity + Control July 2016

DRIVES, MOTORS + SWITCHGEAR

Figure 6: 10:1 inertia match – default setting.

Figure 7: 10:1 inertia match – optimum settings.

Conclusion It appears that the conventional wisdom on matching is valid in this case with good response easily achieved. Note that the presence of load friction would make system tuning more difficult. That said, most systems tend to be dominated by inertia. The Servo Parameters shown are by no means the only combinations possible for stable system response. For point to point control, such as a drillingmachine, the rise time could be shortened at the expense of overshoot. As long

Figure 6 • This time the inertia of the load exceeds the rotor inertia by 10:1. The default servo parameters result in the large overshoot and long settling time. The small Steady State Error is the result of no friction present

Figure 7 • Well behaved response in spite of the 10:1 inertia mismatch

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A5 Emax2 Power Manager 2016.indd 1 Electricity+Control July ‘16

6/6/2016 4:57:02 PM

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