Resumen de The influence of stacking technologies on structural dynamic properties of electric motors iron cores

Sebastian Mönninghoff, Marcus Jäger, Kay Hameyer

• Purpose – It is essential to understand the structural dynamic behavior of electrical machines to predict their acoustic and vibrational behavior. Stacking technology, which is used to manufacture soft magnetic cores, has a strong influence on the material properties. The purpose of this paper is therefore to research the influence of the stacking technologies welding and bonding with bake varnish on the modal properties of iron cores.

  Design/methodology/approach – A finite element simulation model is developed based on homogenization of the stator core. Eigenfrequencies, modeshapes and modal damping ratios are extracted from measurements and are used to validate the simulation model.

  Findings – Modal characteristics depend on the participation of certain material layers at a certain mode.

  Higher amount of shear deformation results in higher modal damping. Bonded stacks exhibit lower shear stiffness and higher damping ratios.

  Originality/value – This research paper provides insights to the modal characteristics of iron cores used in electric machine and compares the influence of stacking technologies.