Engineering Physics Annotation << Back Simulation of a Sensorless Vector Control SystemBased on an Adaptive Observer With Identifi cationof Electrical Parameters Dar’enkov A.B., Titov V.G., Khramov A.E. An adaptive observer with a parameter identifi er is used in electric motor control systems, as well as in integrated emergency protection for IGBT modules, that are widely used in voltage inverters as a part of energy storage systems, electric vehicle battery charging/discharging devices and etc. The article investigates the adaptive observer developed by the authors, whose performance is verifi ed on the basis of a sensorless vector control system of an induction motor. The utilize of this system makes it possible to determine the rotational speed of the motor shaft, taking into account changes in the active resistance of the stator winding without using a rotational speed sensor with an estimation error of less than 1 %. A functional diagram is presented that reveals the general structure of the developed state observer for the electric motor, as well as the results of its simulation studies. The latter were carried out using the designed Simulink model with a vector control system for an induction motor without a speed sensor with a state observer and a machine parameter identifi er. The results of the conducted studies have shown high accuracy in estimating the engine shaft rotation frequency (in transient modes, the error does not exceed 3,71 %, and in steady-state mode – less than 0,35 %), provided that the active resistance of the stator varies. These errors are acceptable in the technical implementation of the asynchronous motor parameter identifi cation system or IGBT modules. Keywords: speed sensorless vector control system, state observer, adaptive system, induction motor, reference model, identifi er, protection of IGBT modules, three phase voltage inverter. DOI: 10.25791/infizik.11.2024.1437 Pp. 20-29.