Sliding Mode Control of Active Magnetic Bearings -- A Cascaded Architecture

TL;DR

This paper introduces a cascaded sliding mode control approach for active magnetic bearings, enhancing rotor positioning accuracy and robustness through nonlinear control and adaptive estimation, with proven stability and simulation validation.

Contribution

It presents a novel cascaded nonlinear control strategy with adaptive estimation for magnetic bearings, improving stability and performance over existing methods.

Findings

Proven uniform asymptotic stability of the control system.

Effective rotor position regulation demonstrated in simulations.

Enhanced robustness and accuracy of magnetic bearing control.

Abstract

Accurate and robust positioning of rotor axle is essential for efficient and safe operation of high-speed rotational machines with active magnetic bearings. This study presents a cascaded nonlinear control strategy for vertical axial positioning of an active magnetic bearing system. The proposed scheme employs two sliding mode controllers for regulating rotor vertical position and current and an adaptive estimator to invert the nonlinear input mapping. Uniform asymptotic stability is proven for the closed-loop system and the efficacy and performance of the proposed design is evaluated in simulation.