Fig. 8. Experimental results of the proposed control system validate the
efficiency improvement. Power losses under constant nominal speed 1 (p.u)
and suddenly step load from 0.1 (pu) to 0.7 (pu).
Dot-line: At transition time the FLC2 is not activated, the stator current is
recovered to its nominal value.
Solid-line: At transition time the FLC2 is activated, the stator current is
recovered to an optimal value lower to its nominal.