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A novel sensorless vector controlled induction motor drive system is presented in this paper. In this system, compensation of the drift components of the stator voltage vector is done by offset voltage vector estimation to improve the low-speed drive characteristics. The motor speed is estimated from the difference between the estimated synchronous and slip speed. An effective on-line method for estimating both stator and rotor resistances is introduced in this system to achieve high-precision control at low-speed. The estimation method for rotor resistance is based on the error signal between the command value of reactive power and its actual value being based on stator voltage and current measurements. On the other hand, the error between the magnitude of the stator current command and its measured value is used to estimate the stator resistance variations from its set value. This paper clarifies that the low-speed estimation is possible with stator and rotor resistance estimation and the zero-speed control is achieved under load condition. Simulation results are provided to demonstrate smooth steady-state operation and high dynamic performance of the drive system at very low-speed and at zero-speed.

SPEED AND PARAMETER IDENTIFICATION FOR SENSORLESS VECTOR CONTROL OF INDUCTION MOTORS AT VERY LOW SPEED