Design, identification and control of a fast nanopositioning device

S. Salapaka, A. Sebastian, J. P. Cleveland, M. V. Salapaka

Research output: Contribution to journalArticlepeer-review


This paper presents the design, identification and control of a nanopositioning device. The device is actuated by a piezoelectric stack and its motion is sensed by a Linear Variable Differential Transformer (LVDT). A fourth order single input single output model has been identified to describe its dynamics. It is demonstrated that PI control law does not meet the bandwidth requirements for positioning. This motivated the design and implementation of an H controller which demonstrates substantial improvements in the positioning speed and precision besides eliminating the undesirable nonlinear effects of the actuator. The characterization of the device in terms of bandwidth, resolution, and repeatability is also shown.

Original languageEnglish (US)
Article number45
Pages (from-to)1966-1971
Number of pages6
JournalProceedings of the American Control Conference
StatePublished - 2002
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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