Extension of the Jiles-Atherton Hysteresis Model to Characterize the Magneto-Mechanical Behavior: Experimental and Numerical Investigations for Stator Blanking

摘要

Stators of electrical machines are manufactured by ferromagnetic sheet metals blanking. The literature shows that the magnetic efficiency depends on the mechanical deformation/stress states. Thus, the simulation of manufacturing processes leading to the mechanical deformation mapping coupled to a magnetic behavior model can be useful in the design of the rotating machines. This work focuses on a magneto-mechanical coupling approach applied to a stator teeth blanking. An experimental characterization of the magnetic behavior of a Fe-Si alloy under tensile tests is done. The magnetic behavior is described by Jiles-Atherton model. An extended formulation is then proposed to model the magnetic behavior under mechanical deformation. Genetic algorithms are used to identify the corresponding hysteresis parameters. Finite element simulation of teeth blanking is done under Abaqus. This simulation allows us to access to the deformation states on the blanked sheet. A Python code is implemented to extract the plastic equivalent strain for each element mesh from the finite element simulation. Then, according to the extended Jiles-Atherton model, the corresponding magnetic induction is calculated. Finally, a new Abaqus output is created, called magnetic induction, and is injected into the Abaqus file to depict the magnetic parameter distribution. Results show the magnetic induction distribution and signpost that the magnetic degradation reaches 24% near the cut edge. The affected zone is 1.5 mm large.