Properties of sensorless control systems based on multiscalar models of the induction motor

Purpose – To develop general forms of multiscalar models of the induction motor and to present properties of the sensorless control systems based on such models.Design/methodology/approach – Previously presented multiscalar model of the induction motor based on a stator current and rotor flux vector is generalized as a model of type 1. New model of type 2 is defined for stator current and the vector which is directly controlled by a voltage vector. The above models are applied in a sensorless control system with speed observer. Dynamical properties of the sensorless control systems are investigated by simulations and experiments.Findings – Application of the multiscalar model of type 2 results in higher exactness of sensorless control system than application of the multiscalar model of type 1. Controlled variables are more smooth in transients.Research limitations/implications – This is not an analytical proof of stability of the control systems.Practical implications – Provides very useful information fo...