| Abstract |
Design of directly parametrized full-order observers for induction motors is
considered. Physics-based observers having properties of the "current" and "voltage" models at low and nominal stator frequencies, respectively, have been designed previously by other researchers. This paper is believed to be the first, not only to show that the same properties can be achieved with a classical (Gopinath) full-order observer, but also to present the proper analytical observer gain selection. Good damping and fast convergence is achieved as well. The proposed observer is compared to the Kalman filter
(KF) and it is shown that the dynamic properties of a sensibly designed KF resemble somewhat those of the observer, while the KF has much worse flux estimation properties. The costly extra computations needed to implement the KF are therefore not likely worthwhile. |
