The Impact of Mechanical Stress due to Press Fit on Stator Core Loss

This paper presents a new approach for measuring the magnetic core loss in the stator of an electric machine aimed for electric vehicle applications. Using this method, the effect of mechanical stress on the magnetic characteristics of a fully assembled stator core is studied. Later core loss is calculated based on the measurement data. It is shown that the BH curve of the steel lamination changes due to the mechanical stress. The core loss also increases by more than fifty percent for the sample under test. This increase in the loss can be crucial for the performance of the electric motor in the highly competitive field of the electric vehicle market.