Synchronous disturbance suppression of active magnetic bearing rotor systems using variable period adaptive control algorithm

Abstract

This paper aims to investigate the issue of suppressing synchronous vibration in active magnetic bearing (AMB) systems. The rotor mass imbalance is a challenging problem for the AMB system, which will cause synchronous vibration and severely affect the system stability and safety. However, existing algorithms based on the iterative feed-forward control strategy find it difficult to simultaneously ensure system’s stability and competent convergence performance. They struggle to maintain tolerable robustness within the system operating bandwidth. This paper proposes a variable period adaptive control algorithm to address these challenges. The overall control scheme can achieve current and displacement elimination separately by switching control structures and is applicable to variable speed conditions. This algorithm can adaptively adjust the iteration period based on rotational speed to ensure both splendid convergence performance and system dynamic performance. Furthermore, this work employs the Lyapunov method to analyze the algorithm’s asymptotic stability and provides a lookup table for algorithm parameters. This could significantly enhance the robustness and stability of the algorithm within the system operating bandwidth. Finally, this methodology has proven to be effective and superior in simulations and experiments.

A novel three-module real-time adjustable accuracy speed estimator for active magnetic bearing system

“…Due to the absence of mechanical contact between the rotor and stator, the AMB system boasts numerous advantages over conventional mechanical bearings, control capabilities of the AMB system to devise unbalance control algorithms, aimed at mitigating these vibrations. These methods can be broadly categorized into two types: unbalance compensation and automatic balancing [3]. The former aims to attenuate displacement vibrations, enabling the rotor to rotate about its geometrical axis.…”