4H.Kubota,K.Matsuse,T.Nakano.A DSP based speed adaptive flux observer of induction motor. IEEE IAS Annu.Meet. Conf.Rec . 1991
5L.Xu,X.Xu,T.A Lipo,and D.W.Novo-tny.vector con- trol of a synchronous Reluctance motor including saturation and iron loss. IEEE Transactions on Industry Applications . 1991
6James N Nash.Direct Torque Control,Induction motor vector control without an encoder. 1EEE Transactions on Industry Applications . 1997