The　core　losses　quantification　of　magnetic　components　with　geometrically　diverse　cores　for　power　converters　remains　a　challenge　and　an　area　of　active　research.　By　using　finite　element　analysis　software　Ansys　Maxwell,　a　simulation　method　for　core　losses　calculation　under　PWM　voltage　excitation　is　proposed　based　on　the　modified　Steinmetz　equation　(MSE)　in　this　paper.　The　magnetic　properties　measurement　and　model　of　core　material　are　specified,　which　are　basis　of　core　losses　simulation.　Furthermore,　the　work　conducts　a　comprehensive　error　analysis　to　identify　primary　sources　of　simulation　inaccuracies,　accompanied　by　targeted　mitigation　strategies.　To　validate　the　methodology,　core　losses　of　a　ferrite　EE　shaped　core　are　simulated　and　subsequently　compared　with　experimental　measurements　acquired　through　the　DC　power　method.　The　close　agreement　between　simulated　and　empirical　results　demonstrates　the　efficacy　of　the　proposed　methodology.　©　2025　China　Power　Supply　Society.　All　rights　reserved.