In this paper, some new approaches by using an
adaptive binary observer, a reduced order extended Kalman
filter, and a two degrees of freedom controller to high
performance variable drive system for the induction motors
without speed sensor are proposed. The speed sensorless vector
controls realized in this paper have the robustness to the load
and parameter variation and the excellent dynamic
characteristics in comparison with conventional spaeed
sensorless vector control schemes. The binary observer estimates
the rotor speed and rotor flux with alleviation of the high
frequency chattering, and retains the benefits achieved in the
conventional sliding observer. The reduced order extended
Kalman filter for sensorless control has advantage of saving
computation time and simplifying structure in comparison with
the full order extended Kalman filter, and also retains the
benefits achieved in the extended Kalman filter, such as good
robustness to measurement noises and parameter variation. In
the two degrees of freedom controller, feedback controller to
robustly control the variations of the rotor resistance is
implemented by H, control theorem, and feedforward
controller to get a good tracking performance is designed. Newly
proposed systems implement the speed sensorless vector control
of induction motors by 32-bit floating point TMS 320C31 DSP.