In　order　to　reduce　the　number　of　converter　when　large-capacity　motor　and　small　motor　are　used　simultaneously　and　to　further　improve　control　performance　of　each　motor＇s　torque,　a　direct　torque　control　(DTC)　strategy　was　proposed　for　six-phase　symmetrical　winding　salient　pole　permanent　magnet　synchronous　motor　series-connected　three-phase　salient　pole　permanent　magnet　synchronous　motor　(PMSM).　By　using　the　orthogonal　transformation　matrix,　the　electromechanical　energy　conversion　variables　of　the　two　motors　was　projected　into　the　space　of　two　orthogonal　planes,　and　the　non　electromechanical　energy　conversion　variables　was　projected　into　the　zero　sequence　space,　to　achieve　the　two　motor　flux　and　torque　decoupling.　The　optimal　switching　table　was　constructed　by　combining　the　single　voltage　vector　and　the　partial　combined　voltage　vector　to　control　the　torque,　stator　flux　linkage　and　zero-sequence　current　of　two　motors　at　the　same　time.　The　experimental　results　shows　that　the　proposed　control　strategy　makes　each　motor　stator　flux　linkage　and　electromagnetic　torque　decouple　each　other.　©　2017　Chin.　Soc.　for　Elec.　Eng.