error can be obtained to (10). The block diagram of the estimation
error model using the rotor flux error signal is shown in
Fig. 4. Fig. 5 is the estimation error model of the proposed speed
estimator that combines the conventional rotor speed estimator
with Fig. 4. Fig. 6 is a simplified block diagram represented in
the rotor flux oriented reference frame. If the estimated rotor
flux converges to the real one, one can easily know that the feed
forward block does not work any more.