Abstract
This paper proposes a new technique for the selection of a coil-fixing varnish in order to improve the adhesive strength of motor coils by applying the molecular dynamics (MD) simulation to the finite element method (FEM) deformation analysis. The MD simulation was used to create a styrene-free varnish material that had 73% stronger adhesion to enameled wire and 16% larger bending modulus than conventional varnish that contains styrene. The calculated bending modulus was confirmed by an experiment. The FEM deformation analysis was carried out to evaluate the deformation behavior caused by electromagnetic force for motor coils assembled from enameled wire and adhesive varnish. The FE analysis results show the deformation in the case of styrene-free varnish material is less than that of conventional varnish material. Thus, evaluation of the adhesion strength at an atomic level through simulation can help reduce coil end deformation in motor by calculating the adhesion strength at a macroscopic level.
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