Sensorless control system of an induction machine with the Z-type backstepping observer

The paper presents the sensorless control of induction machine based on multi-scalar variables in which the rotor angular speed is estimated by the novel structure of the speed observer. The novel speed observer structure is constructed by using the backstepping approach. This observer structure is named Z-type observer backstepping. A comparison between the standard adaptive backstepping and the Z-type observer backstepping is made. The experimental results show the properties of the control system and in particular the Z-type observer backstepping.