Continuous reset element: Transient and steady-state analysis for precision motion systems

TL;DR

This paper introduces a continuous reset element architecture for precision motion systems that improves transient response and steady-state precision, overcoming limitations of traditional reset elements and enabling complex-order behavior.

Contribution

A novel continuous output reset element architecture is proposed, enhancing transient response and steady-state precision in motion control systems.

Findings

Steady-state precision is preserved with reduced sensitivity peak.

Transient response shows significant improvement with the new architecture.

Practical example confirms the ability to achieve complex-order behavior.

Abstract

This paper addresses the main goal of using reset control in precision motion control systems, breaking of the well-known "Waterbed effect". A new architecture for reset elements will be introduced which has a continuous output signal as opposed to conventional reset elements. A steady-state precision study is presented, showing the steady-state precision is preserved while the peak of sensitivity is reduced. The architecture is then used for a "Constant in Gain Lead in Phase" (CgLp) element and a numerical analysis on transient response shows a significant improvement in transient response. It is shown that by following the presented guideline for tuning, settling time can be reduced and at the same time a non-overshoot step response can be achieved. A practical example is presented to verify the results and also to show that the proposed element can achieve a complex-order behaviour.