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Observers Synthesis for Estimation of the Rotor Fluxes, Rotor Resistance and the Load Torque for Speed Sensorless IMs

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A state observer is proposed for induction machine; with this observer it possible to observe rotor flux, rotor resistance, rotating speed and load torque. The gain of this observer involves a design function that has to satisfy some mild conditions which are given. Different expressions of such a function are proposed. Of particular interest, it is shown that high gain observers and sliding mode observers can be derived by considering particular expressions of the design function.
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High Gain Observer; Sliding Mode Observer; State Transformation; Lyapunov Equation Candidate; Sensorless Speed

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