The Butterworth filter is known to have maximally flat response. Incidentally, the same response is desired in precise positioning systems. This paper presents a method for obtaining a closed-loop Butterworth filter pattern using common control schemes for positioning applications, i.e. Integral Resonant Control (IRC), Positive Position Feedback (PPF), and Positive Velocity and Position Feedback (PVPF). Simulations show a significant increase in bandwidth over traditional design methods and verify the desired pole placement is achieved. Experiments are performed using a two-axis serial kinematic nanopositioning stage. The results show a significant improvement in bandwidth and increased positioning accuracy, specifically at the turn-around point. This allows a greater portion of the scan to be used and improved positioning accuracy at high scanning speeds.
|Title of host publication||2015 European Control Conference (ECC)|
|Number of pages||6|
|Publication status||Published - 23 Nov 2015|
|Event||14th annual European Control Conference - Linz, Austria|
Duration: 15 Jul 2015 → 15 Jul 2015
|Conference||14th annual European Control Conference|
|Period||15/07/15 → 15/07/15|