Lad. Ribeiro et al., Real-time estimation of the electric parameters of an induction machine using sinusoidal PWM voltage waveforms, IEEE IND AP, 36(3), 2000, pp. 743-754
This paper studies the parameter estimation of induction machines. The prob
lems associated with the parameter estimation of induction machines are ana
lyzed through sensitivity functions. Then, models and a procedure to estima
te a set of four basic parameters (r(s), sigma l(s), l(s), and tau(r)) are
proposed. The discrete-time parameter estimation models are written in the
delta operator specifically because it provides good numerical properties a
t high sampling rates, where the discrete-time model approaches its continu
ous-time equivalent. This feature permits the direct estimation of the cont
inuous-time parameters. The main feature of the proposed procedure is the p
ossibility to estimate the parameters by using sinusoidal signals, and with
out the measurement of the machine speed. The experimental results obtained
with the proposed estimation procedure are presented and demonstrate that
it is possible to map the parameters in terms of the operating conditions o
f the induction machine.