This　paper　proposes　a　position　sensor　fault　detection　scheme　using　single　dc-bus　current　sensor　for　interior　permanent　magnet　synchronous　motor　(IPMSM)　drives.　The　three-phase　currents　are　derived　from　the　single　current　sensor,　and　the　accuracy　uncertainty　of　the　sensor　is　also　considered.　The　six　active　vectors　are　divided　into　three　groups　for　sensor　calibration.　Then,　the　proposed　dc-bus　current　sensor　offset　error　calibration　method　is　implemented　by　setting　two　opposite　basic　vectors　together　and　measuring　the　current　values　on　both　sides　of　the　junction　point　in　a　same　time　interval.　If　the　sum　of　the　two　sampled　currents　is　not　zero,　it　indicates　that　the　offset　error　of　the　dc-bus　current　sensor　exists.　Therefore,　a　corresponding　compensation　method　is　proposed.　Meanwhile,　the　dc-bus　current　slopes　under　different　switching　states　are　closely　related　to　the　rotor　position,　which　are　utilized　for　position　sensor　error　detection.　Finally,　the　effectiveness　of　the　proposed　scheme　is　verified　by　experimental　results　on　a　5-kW　IPMSM　motor　prototype.　©　1996-2012　IEEE.