Novotroitsk Branch of NUST MISIS, Orsk, Russia:
A. V. Tsukanov, Student, e-mail: 03-06-2000@mail.ru

2 South Ural State University (National Research University), Chelyabinsk, Russia:
K. V. Litsin, Cand. Eng., Associate Professor, e-mail: k.litsin@rambler.ru
S. N. Baskov, Cand. Eng., Associate Professor, e-mail: baskovsn@susu.ru

The current problem of using equipment with asynchronous motors at metallurgical enterprises is considered. A fairly large number of equipment is used in production, where the installation of a speed sensor on the motor shaft is impossible due to operating conditions, technological, economic and other restrictions. Therefore, the actual direction of development of the electric drive is the use of systems with an observer of the speed or angle of the rotor position. A comparative analysis of various sensorless systems in an asynchronous electric drive is carried out. The expediency of using observers in asynchronous motors instead of speed sensors is presented. The general requirements for the sensorless electric drive are formulated. The main advantages and disadvantages of each method are determined. The need to develop a new model that meets all the requirements has been identified. The resulting model is able to indirectly determine the parameters of the machine using only its stator variables, and also capable of operating at low speeds close to zero. Thus, this model has advantages over existing methods. The derivation of the dependence based on the basic model of the electric drive is given. On the basis of the obtained equations, a mathematical model of an asynchronous sensorless electric drive was developed in the Matlab program. A comparative analysis of the results of determining the value of the real and estimated speeds is carried out. The developed system can be used in metallurgical workshops, in particular, in steelmaking facilities that do not require a high level of determination of the angular position. As a result of laboratory experiments, it was required to use an additional system to identify the parameters of an induction motor based on a continuous gradient method for finding the minimum of a function.

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