Tracking control for sensorless induction motors with uncertain load torque and rotor resistance

The problem of controlling sensorless induction motors with uncertain constant load torque and rotor resistance is addressed. A new eigth order dynamic nonlinear adaptive control algorithm is designed, which feeds back only stator current measurements and does not require open loop integration of flux dynamics. Local exponential rotor speed and flux modulus tracking of smooth bounded reference signals are guaranteed under persistency of excitation.