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The paper deals with the experimental validations of the corrective coefficient used to take into account the skin effect in the equivalent circuit rotor resistance of induction motors with squirrel cages. Locked rotor tests have been performed at several supply frequencies on different induction motors; the collected experimental data have been used to validate the rotor parameters analytical estimation...
This paper proposes a sensorless rotor temperature estimator for small to medium size mains-fed induction machines. With measurements obtained from only current and voltage sensors, the proposed estimator can capture the rotor temperature in an online fashion. First the rotor speed is extracted from the current harmonic spectrum based on the estimated rotor slot and eccentricity harmonic frequencies...
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