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<p>Switching power amplifiers are essential actuators in active magnetic bearing systems, yet traditional control methods in multi-phase applications often suffer from slow dynamic response and limited current tracking accuracy. To address these limitations, this paper proposes an optimized digital One-Cycle Control algorithm tailored for AMB switching power amplifiers. The method incorporates coil resistance voltage-drop compensation into the OCC framework, reconstructs the mathematical model of the full-bridge topology, and unifies the duty-cycle solution for both positive and negative current cycles. The improved model significantly enhances tracking precision and dynamic behavior. Simulation results demonstrate zero steady-state current error, substantially reduced current distortion, and strong sinusoidal tracking capability, with the fundamental output current retaining 99.2% at 1 kHz, 90.1% at 2.5 kHz, and maintaining effective control bandwidth up to 3290 Hz. Experimental validation further confirms accurate static characteristics, faster transient response, and improved consistency between theoretical and measured results. The proposed method provides an efficient and robust current control solution for high-performance AMB switching power amplifiers.</p>

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Optimization of One-Cycle Control Algorithm for Switching Power Amplifiers in Active Magnetic Bearing Systems

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Lei Gong,
  • Shangshang Hou,
  • Wenjun Huang,
  • Jingwen Chen

摘要

Switching power amplifiers are essential actuators in active magnetic bearing systems, yet traditional control methods in multi-phase applications often suffer from slow dynamic response and limited current tracking accuracy. To address these limitations, this paper proposes an optimized digital One-Cycle Control algorithm tailored for AMB switching power amplifiers. The method incorporates coil resistance voltage-drop compensation into the OCC framework, reconstructs the mathematical model of the full-bridge topology, and unifies the duty-cycle solution for both positive and negative current cycles. The improved model significantly enhances tracking precision and dynamic behavior. Simulation results demonstrate zero steady-state current error, substantially reduced current distortion, and strong sinusoidal tracking capability, with the fundamental output current retaining 99.2% at 1 kHz, 90.1% at 2.5 kHz, and maintaining effective control bandwidth up to 3290 Hz. Experimental validation further confirms accurate static characteristics, faster transient response, and improved consistency between theoretical and measured results. The proposed method provides an efficient and robust current control solution for high-performance AMB switching power amplifiers.