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Influence of Concentrated Winding and Insulation on the Vibration Behavior of Electric Machines

The acoustic behavior of electric machines is defined by the electromagnetic forces and the structural-mechanical properties of the machine. The electromagnetic design of the machine determines which force waves occur beside the force waves of the fundamental spatial harmonic. If the force waves have a similar or an identical shape and frequency as an eigenpair of the stator (eigenfrequency and eigenmode), high acoustic noise emission is radiated into the surrounding area. Therefore, the determination of the mechanical eigenfrequencies and eigenmodes is just as important as the force calculation. However, the impact of different winding types and insulation techniques on the vibration behavior has not yet been analyzed in detail. In this work, the vibration behavior of a stator with a concentrated winding insulated with two different techniques is studied. Four different stator specimens are used: a blank stator, a stator with a loose winding, a stator with an impregnated winding and a stator with a potted winding. The stator specimens are measured by performing an experimental modal analysis and modeled using a 2D FE simulation. Equivalent material parameters are derived for the homogenized winding, consisting of the winding and the insulation. The resulting material parameters of the homogenized winding can be used for future acoustic and vibration calculations.