Evaluation of Switching Power Amplifier Topology for Active Magnetic Bearings

Abstract

Active magnetic bearings (AMBs) have led to great progress in the field of rotating machinery due to their many advantages, such as their non-contact and non-lubrication properties. As the key component of an AMB actuator, the switching power amplifier has an important impact on the performance of magnetic bearings and rotating machinery. In this paper, the topologies of switching power amplifiers for AMBs are introduced. The traditional half-bridge topology and two newly proposed topologies—the three-phase-half-bridge and neutralized-sharing-bridge topology—are analyzed and discussed. The volume, current output performance and cost of the power amplifier with different topologies are comprehensively evaluated, providing a theoretical basis and guidance for the selection and design of the topology of switching power amplifiers for AMBs under different conditions.

Influence of displacement sensor runout on active magnetic bearing-rotor system and control analysis

“…Since the power amplifier characteristics of each channel are the same, other channels of the power amplifier can be characterized by the transfer function obtained by the above fitting (Yang et al, 2021). The transfer function of the power amplifier is transformed into the state space to obtain a 4 × 4 multi-input multi-output state-space model, and the control voltage u and current i are the input and output of the power amplifier, respectively.…”

Power Amplifiers and Their Feedback Mechanisms for AMB—A Comprehensive Review

“…Evaluation of various topologies was carried out in [30] and guidance was offered on selecting the topologies based on different coil pair arrangements and bias current distributions. The work also compares both traditional and novel SPA topologies, providing a comprehensive comparison of three topologies: half bridge, 3-phase-halfbridge, and neutralized-sharing-bridge designs.…”

“…Initial comparisons of switching topologies were conducted by researcher in [61]. Later the different topologies were analyzed and simulated by authors in [30].…”

“…12. ), necessitating 32 switches and their corresponding isolation drive circuits [30]. Properly modeling stray inductances in connecting wires is crucial for practical results closely matching simulations [61].…”

Fault Detection in Active Magnetic Bearings Using Digital Twin Technology

“…All AMB systems fail due to the amplifier failures, causing no output power. Initially, a linear power amplifier was implemented in AMBs, but because linear power devices utilize a large amount of energy, they have been replaced with switching power amplifiers (SPAs) [29]. Failure in the position sensor results in errors in the signal feedback to the control system, which causes the rotor to become unstable and finally leads to failure in the AMB system.…”