Virtual Inverse Vibration Synthesis for the Estimation of Magnetic Forces during Electric Machine Operation

The vibration of electric machines responsible for annoying acoustic noise is essentially due to magnetic forces that occur at the airgap and apply on the radiating stator. A proper estimation of those forces is necessary to ensure the accuracy of simulation models that predict the vibration of electric machines. However, these forces are not measurable directly. This paper proposes a method, namely inverse vibration synthesis, that estimates the forces during the operation of electric machine. It is applied to a virtual Permanent Magnet Synchronous Machines (PMSM), i.e. a simulation model representing the machine provides the operating vibration behavior, as a first exploration study within ideal conditions. Several intermediate checks are performed throughout the study in order to assess the feasibility of the method to estimate accurately the magnetic forces, and shows that the method still requires significant analyses while it presents promising static eccentricity detection capabilities.