A　novel　stator　flux　linkage　estimator　with　wider　adjustable　speed　range　and　higher　robustness　is　investigated　in　this　paper　based　on　sliding　mode　control　theory.　The　stator　current　and　stator　flux　linkage　are　used　as　state　variables　and　the　stator　flux　linkage　estimate　is　adjusted　with　the　error　of　current　estimate.　The　experimental　results　show　that　the　presented　flux　linkage　estimator　is　insensitive　to　the　DC　offset　of　the　current　sampling　channels　and　parameters　of　motor,　and　the　permanent　magnet　synchronous　motor　(PMSM)　direct　torque　control　(DTC)　system　has　wider　adjustable　speed　range.　©　2010　Chin.　Soc.　for　Elec.　Eng.