In this paper, a finite element modeling of permanent magnet micro actuator is presented. The later is coupled with a micro screw pump, which can be used in biomedical applications for the pumping of biological fluids such as blood (surgery of heart, blood treatment machines). At first the resolution of the electromagnetic problem is carried out in 3D linear magnetostatic assumption. The characteristics evaluations concern the magnetic torque coupling. The obtained results with linear hypothesis agree well with the ones given in literature. Then, a non linear case study of permanent magnet magnetisation is considered.
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