An　improved　subdomain　model　was　established　to　calculate　the　electromagnetic　performance　of　the　complex　structure　of　dual-winding　bearingless　flux-switching　permanent　magnet　motor(BFSPMM).　An　equivalent　current　analysis　method　was　proposed　for　suspension　winding　with　the　distributed　double-layer　windings　of　dual-winding　BFSPMM.　The　upper　and　lower　winding　currents　are　equivalent　to　the　same　current　element.　Compared　with　the　distributed　double-layer　windings　analysis　method　in　the　traditional　sub-domain　model,　the　improved　sub-domain　model　method　proposed　can　reduce　the　number　of　unknown　coefficients　and　reduce　the　complexity　of　the　magnetic　field　calculation,　the　unknown　parameter　matrix　can　be　simplified　from　order　22　to　order　18.　According　to　the　non-linear　characteristics　of　the　actual　motor　core　material,　a　relative　permeability　function　compensation　method　considering　magnetic　saturation　was　proposed.　The　saturated　magnetic　resistance　of　the　stator　and　rotor　teeth　is　equivalent　to　the　increase　in　air　gap　magnetic　resistance.　The　saturation　of　the　iron　core　is　indirectly　reflected　by　equivalently　increasing　the　air　gap　length　of　the　motor.　Then,　according　to　the　conservation　principle　of　magnetomotive　force,　the　relationship　of　air　gap　flux　density　under　the　linear　and　nonlinear　conditions　was　derived.　Finally,　the　validity　of　the　proposed　method　is　verified　by　finite　element　method　and　prototype　experiment.　©　2022,　Harbin　University　of　Science　and　Technology　Publication.　All　right　reserved.