Nowaday, several applications conceming control of a 3-
phase induction motor, I.M., based on the modern control
techniques have been established [l] - [SI. Yet there are
many tasks require precise control schemes.The necessity to
perform zero steady state tracking error, robust control with
acceptable transient response and simple control law are the
greatest demand in any application of the modem control
theory. However, in the previous work [5],which depends
on the indirect field-oriented control, for instance, the slip
frequency control method offers the advantage of nondetection of rotor flux