The　precision　of　position　estimation　is　highly　dependent　on　the　accuracy　of　multiple　current　sensors,　whereas　the　conventional　error　calibration　strategies　for　current　sensor　accuracy　uncertainty　(SAU)　problem　have　limitations　regarding　the　position　sensorless　controlled　drives.　In　order　to　solve　this　thorny　problem,　this　article　proposes　a　mutual　calibration　strategy　for　the　multiple　current　sensors　in　an　interior　permanent　magnet　synchronous　motor　(IPMSM)　drive.　The　proposed　current　sensor　error　calibration　strategy　takes　full　advantage　of　the　correlation　among　the　multiple　current　sensors　themselves　without　using　any　complicated　observers.　Moreover,　the　traditional　seven-segment　space　vector　pulsewidth　modulation　technology　is　applied　without　modification.　The　only　change　is　reflected　in　several　sets　of　the　artificially　added　current　sampling　points.　The　effectiveness　of　the　proposed　strategy　is　verified　by　experimental　results　on　a　5-kW　IPMSM　motor　prototype,　which　shows　that　the　calibrated　current　sensors　exhibit　improved　accuracy,　and　the　position　estimation　accuracy　is　also　guaranteed.　©　1982-2012　IEEE.