A SPEED IDENTIFIER FOR INDUCTION-MOTOR DRIVES USING REAL-TIME ADAPTIVE DIGITAL FILTERING

A novel sensorless speed identifier for real-time application in induc tion motor drives under steady-state and transient conditions is propo sed. It is based on the calculation of rotor slot harmonic (RSH) frequ encies using ail adaptive digital filter. ft outperform other analog o r spectrum-based RH speed identifiers in terms of accuracy and speed o f response, The new identifier measures the speed with less than 0.1% error bs processing the stator current on a sample-by-sample basis, It is also capable of tracking; speed transients of high slew rates with high accuracy. The authors believe this to be the first effective tra cking of RSH's during transients ever reported. The proposed algorithm is computationally very efficient and requires only a single processo r for its real-time implementation, Simulated and experimental data we re used to validate the algorithm.