A Simple Leakage Inductance Identification Technique for Three-Phase Induction Machines Under Variable Flux Condition

Accurate knowledge about the leakage inductance at different flux levels is required for the correct identification of the magnetizing curve of the induction machine. Its exact value is also necessary for the estimation of various other parameters required for high performance control. This paper proposes a simple technique to identify the leakage inductance of the machine at different flux levels by operating it near the torque limit. The leakage inductance is stored in the processor memory as a function of the rotor magnetizing current through the “piecewise mixed model” of approximation for online application. Different experiments performed on a practical machine validate the proposed concept.