| Abstract |
Sensorless vector control of induction motor drives requires knowledge of the instantaneous value of
the rotor flux and speed. Various methods of the rotor flux and speed estimation were recently used,
based on the mathematical models of the induction machine, on nonlinear phenomena caused by rotor
excentricity or other motor saliences and based on neural networks. The main goal of the paper is the
comparison of chosen flux and speed observers in simulation – from the point of view of sensitivity to
motor parameter changes, as well as in experiments - from the point of view of proper work in
dynamical states and low speed region. The four different concepts were tested: two flux simulators,
reduced and full order flux observers, with speed calculated based on estimated flux components and
so called adaptive speed observ er (MRAS) based on full order flux observer and adaptive speed loop.
The results of simulated and laboratory tests are presented and the estimation quality is evaluated. |
