TORSIONAL MODAL ANALYSIS OF SINGLE SHAFT SYSTEMS BY USING A NOVEL VIBROACOUSTIC MODEL OF A PERMANENT MAGNET SYNCHRONOUS MOTOR

Abstract: In this paper a novel torsional experimental modal analysis method based on a new vibroacoustic modeling methodology of a permanent magnet synchronous motor (PMSM) is presented. This methodology accurately describes torsional vibration conditions of a PMSM in case of single-phase pulsating current excitation, in conjunction with small angular displacement of the rotor. The test rig and the modal analysis results are briefly outlined, and an experimental validation consisting of a torque time-frequency (signature) analysis is introduced. The main advantage of the proposed method is that it does not require an external broadband torque source; since the PMSM is part of the investigated system