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The conventional speed transdusers in induction motor drives
impose restrictions on the mechanical ruggedness, the
maintenance and the use in poor enviroment. Therefor, a large
number of schemes for speed sensorless ac drives has been
proposed. In this thesis, the stator flux space vector is
estimated in terms of mathematic induction motor model using
measured currents and voltages to and calculate the rotor speed.
This rotor speed signal is simulated to be a reference signal.
Another rotor speed estimation is based on rotor slots harmonics
detection. Experiment results are presented to demonstrate the
characteristics and restrictions of the two different speed
estimation methods.
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