Advanced measurement technologies for magnetic materials used in automotive applications

Residual stress and high complexity of the dynamic magnetization conditions can significantly influence magnetic properties of materials used in automotive applications. The residual stress remaining in the motor laminations after manufacturing processes, such as punching and welding, has a detrimental effect on power loss and permeability of stator and rotor cores resulting in reduced efficiency and impaired performance. Moreover, the rotational and non-sinusoidal dynamic magnetization increase the loss in laminated stator stacks which can be significantly higher than under standard sinusoidal excitation. Therefore, Brockhaus Measurements developed a wide range of measurement technologies for comprehensive characterization of magnetic properties of electric motor materials. In this publication the examples of experimental data obtained with Brockhaus measurement systems for demonstrating impact of manufacturing and complex magnetization conditions on properties of stator cores and electrical steel laminations are presented and discussed.