Speed sensorless vector control requires accurate motor parameters, but the stator and rotor resistances vary due to the variations in motor temperature. This method requires estimations of the rotor flux and rotor speed. Since the estimations use the machine parameters, the stability of the system is sensitive to the variations of the machine parameters.
In this study, the stability analysis of a speed sensorless vector control system based on speed observer is carried out. The stability of the speed sensorless vector control system of a three-phase squirrel cage induction motor is analyzed. First, a novel differential equation for speed observer is introduced, and the stability analysis method is proposed. Then, the stability effects of the stator resistance, rotor resistance, rotor speed command, load torque, and observer gain are considered.
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