Optimal Estimation of the Parameters and Losses of Induction Motors Working in Full-Wave

Induction machines are the preferred solution in numerous sectors, including industrial, transportation, etc. Accurate estimation of motor parameters and losses is crucial for both efficient operation and precise torque control required by many applications. Numerous techniques have been developed for this purpose. Traditional tests involve no-load and blocked rotor testing procedures. However, they require laboratory facilities with high-precision instrumentation and equipment and might not be feasible in more industrial environments. To overcome these limitations, this paper proposes a method for online parameters and losses estimations for inverter-fed induction motors. The use of the inverter offers interesting possibilities, not only regarding the precise control of the operating point of the machine (torque and speed), but also to exploit the voltage harmonics injected by the inverter for different modulation modes (PWM, SHE, PWM, etc) to enhance the identification algorithms. A two-stage optimization algorithm has been developed and employed to accurately estimate the parameter and losses of the machine. Experimental results obtained from performing tests at different load conditions are provided, demonstrating the validity of the proposed approach.