Multi-Frequency Vibration Suppression Applied in Multi-Three-Phase Permanent Magnet Synchronous Machines With Identified Vibration Model

This paper presents a generic multi-frequency vibration suppression technique for a multi-three-phase permanent magnet synchronous machine equipped with mechanical bearings. The technique exploits the controllable electromagnetic force to damp mechanical vibrations detected on the machine housing. The machine vibration model is obtained via the black-box identification approach, which can construct the mathematical model of dynamic systems without complex analysis. This article first introduces the mathematical model of the controllable electromagnetic force and torque generation of the considered machine. Then, a state-space representation of the mechanical vibration plant is established and employed to design the active vibration suppression controller. This study attempts to suppress the machine vibrations at multiple frequencies, and each specific harmonic of the vibration is suppressed by a resonant controller. Therefore, the active vibration suppression controller consists of several resonant controllers placed in parallel. The linear quadratic regulator technique has been employed to select the optimal controller gains. The technique is finally validated by experimental tests showing that the active vibration control technique can effectively suppress the detected vibrations.