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Influence of Manufacturing Processes on Magnetic Properties of Stator Cores

Differences between the prior and postproduction magnetic properties of stator laminations are considered as one of the main sources of discrepancy between the expected and actual electric motor performances. In this work Brockhaus Measurement testing methodologies were used to evaluate the influences of two common stator production processes, i.e. stamping and welding, on magnetic characteristics of laminated cores. The experimental data from bulk and local measurements clearly indicated the negative impact of residual stresses of mechanical and thermal origins on power loss and permeability of investigated stators.