Download PDF Abstract Improvement of the existing facilities is an important topic for research. Mechanisms of metallurgical enterprises involved in a complex technological cycle often operate under conditions of increased vibrations and the presence of polluting components in the environment, these factors together negatively affect the measuring devices reducing the accuracy of their measurement. Switching to sensor-free control systems allows you to reduce the size of the device, get rid of measurement errors arising from the presence of connecting components between sensors and information processing devices. It also increases the system performance. All these indicators directly affect the quality of products. Parallelization of sensorless control systems is possible by introducing speed observers into the system, which use data obtained in the frequency converter for other purposes to obtain the necessary output parameters. Observers represent a mathematical structure that functions according to certain rules or algorithms. The paper considers several types of observers selected on the basis of a number of criteria, the main one being ease of implementation. The object in question uses an asynchronous motor with a short-circuited rotor, which is controlled by a frequency converter. In the Matlab mathematical modeling environment, the following were developed: a coiler drive control system, a non-adaptive observer, a Kalman observer (filter), an adaptive observer with flow coupling comparison, and an adaptive observer with EMF comparison. The system with a non-adaptive observer was taken as the reference model since the data of the transient process in speed coincided with the data obtained from the speed sensor with a minimum error. Comparison of the simulation results was carried out on the basis of the analysis of the error of the obtained speed characteristics when using different types of speed observers. Keywords Electric drive, control system, speed monitors, coiler, Simulink simulation, Matlab, asynchronous motor.