Nowadays,　with　the　rapid　development　of　high-performance　servo　system,　The　conventional　permanent　magnet　synchronous　motor　(PMSM)　Direct　Torque　Control　(DTC)　system　has　large　torque　ripple　in　low　speed　which　cannot　be　well　adapted　to　today＇s　development.　The　main　reason　is　because　the　number　of　voltage　vectors　provided　by　the　two-level　inverter　is　only　six　and　the　relationship　between　voltage　vector　and　torque　is　not　clear　[1-5.10-12].　In　this　paper,　the　basic　concept　of　direct　torque　control　of　permanent　magnet　synchronous　motor　is　investigated　in　order　to　emphasize　the　effects　produced　by　a　given　voltage　vector　on　stator　and　torque　variations　in　this　paper.　Modified　the　voltage　sector　switching　table,　a　novel　DTC　scheme　for　the　permanent　magnet　synchronous　motor　is　proposed　which　is　using　a　novel　three-level　inverter.　An　improvement　of　the　drive　performance　can　be　obtained　by　using　the　novel　DTC　scheme.　The　simulation　results　showed　that　the　scheme　could　reduce　the　torque　ripple　in　low　speed　and　improved　the　stability　of　the　motor　under　the　condition　of　keeping　the　system　dynamic　performance　©2013　Universitas　Ahmad　Dahlan.