Gil-Su Lee, Dong-Hyun Lee, Tae-Woong Yoon, Kyo-Beum Lee, Joong-Ho Song, and Ick Choy, “Speed and Flux Estimation for an Induction Motor,” in Proc. ICCAS Conf., Oct. 2002, pp. 390–394. > Paper

In this paper, a new method of estimating the rotor speed and flux is proposed on the basis of a fourth-order electrical model of

the induction motor. It is assumed that only the stator currents and voltages are measurable and all the system parameters are

known. There are a number of common terms in the error dynamics, and this is utilized to find a simpler error model involving

some auxiliary variables. Using this error model, the state estimation problem is converted into a parameter estimation problem

assuming that the rotor speed is constant. Some stability properties are given on the basis of Lyapunov analysis. The effectiveness

of the proposed scheme is demonstrated through computer simulations and experimental results.