A new technique for speed control o

A new technique for speed control of a 3-phase Induction
Motor, I.M., based on the improved optimal regulator theory
is synthesized in this paper. The proposed technique
comprises a new error system, vector control of I.M., and the
preview feedfonvard control loop. This is to enhance the
transient response of the controlled system and to increase its
robustness. The Induction Motor is described as a threeinput, three-output controlled object. The state equations of
the I.M. suitable for current control are derived based on the
vector method. In addition, the filed-oriented control system
is constructed by deriving the state equations on a
synchronously rotating reference frame, and trying to
maximize the developed torque over the whole control range
.In the synthesized control system, the speed control and
the field-oriented control with constant flux are attained
simultaneously.The design procedural of the optimal
regulator tecnique with preview feedfonvard steps and the
new error system technique are investigated in this paper.
Digital computer simulation results are obtained to
demonstrate the reliability and effectiveness of this
controlled method.