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The induction machine is widely utilized in the industry and exists in a plethora of applications. Although it is characterized by its inherent stability over a wide range of operating conditions, this characterization is based on steady-state arguments. This work develops a rigorous approach to the open-loop stability of the induction machine. In particular, a condition for the global asymptotic...
Indirect field oriented control of an induction machine requires knowledge of the rotor time constant to estimate the rotor flux linkages. An online method is described for estimating the rotor time constant and the stator resistance both of which vary during operation of the machine due to ohmic heating. The method formulates the problem using a nonlinear least-squares criterion and is guaranteed...
Previous work by the authors has described a differential-algebraic approach to speed estimation in induction motors. The method shows that the speed omega can be found by solving for the roots of a polynomial in omega whose coefficients are functions of the stator voltages, stator currents, and their derivatives. Preliminary experimental results are presented in which the speed is estimated using...
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