Influence of the feeding current harmonies of an electil al machine on its vibration behaviour

the great Progress in the electromechanical conversion domain enables the fabrication of ritaiting actuators with very good performances. fhus reductions of the vibration* produced by these actuators which were often considered m secondary phenomena, are more and more required by the specifications. Lots of work has been done in order to minimize them. This work m~ concerns the electromechanical structure. However, it appears that the vibratory behaviour of permanent magnet machines not only depends on their eletromechanical structures but also on their electronic supply devices and particulary on the characteristics of the feeding Currents. In this paper a computation procedure for the vibration& deriving from electromagnetic phenomena h used to simulate influence of the feeding currents ents on the vibratory behaviour of a permanent magnet machine. This simulation is associated with an experimental study performed on a measurement bench dedicated to test electrical machines and their electronic supply. Characteristics of the vibration* produced by feeding currents ents are deduced from the comparison of the simulation results and measurements. First the procedure of the computation of the vibration& derived from eletromagnetic phenomena is presented. then the mechanical structure and electronical devices of the experimental bench are described The theoretical and experimental study is focused on the vibratory behaviour of a permanent magnet machine without polar pieces. We propose to study the influence of the imperfections of the feeding current% due to defects of the actual supply. This study concerns rant the influence of the rate of unbalance then the effects of one or a~ harmonies of the feeding currents are evaluated.