A Novel Vibration Control Strategy for Active Magnetic Bearing-based Motor Drive with Displacement Harmonic Injection

This paper proposes a novel vibration suppression strategy based on displacement harmonic injection to mitigate prominent rotational frequency vibrations in AMB-based motor drives, with the goal of improving rotor eccentricity and reducing electromagnetic vibrations. First, the impact of rotor eccentricity on the motor system's electromagnetic vibrations is analyzed, revealing the mechanism behind rotational frequency vibrations. Next, the influence of manufacturing errors on displacement control accuracy is discussed, and an error compensation strategy is introduced to enhance the system's response to imbalance and improve rotor performance through dynamically adjusted reference commands. Experimental results demonstrate the effectiveness of the proposed method, with the motor's rotational frequency vibration acceleration reduced by 98.1% compared to traditional PID control and by 87.5% compared to conventional displacement vibration suppression techniques.