Sensorless non‐linear position‐stabilising control for magnetic levitation systems

This study presents a solution to the position stabilisation problem for non‐linear magnetic levitation systems using the only position measurement. This considers parameter and load variations without the use of current and velocity feedback. The features are given as follows: (i) the removal of current and velocity feedback by the proposed first‐order state estimators without system parameters, (ii) securing of improved closed‐loop robustness from the combination of active damping and specified feedback gain with the closed‐loop system order reduced to 1 and (iii) proof of performance recovery and offset‐free in the absence of regulation error integral actions. The numerical simulations verify the performance and robustness improvements through realistic scenarios.