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.
The paper presents simulation results of a two-dimensional permanent magnet synchronous motor, which were calculated by the help of the Infolytica MotorSolve and of the COMSOL Multiphysics, as well. The simulation results were compared with each other focusing on the torque, the magnetic flux density and the magnetic potential of the permanent magnet synchronous motor.