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STABILITY OF ANONLINEAR SYSTEM «FREQUENCY CONVERTER-ASYNCHRONOUS MOTOR»

In modern industry, various industries are widely used frequency converters (FС) to control the speed of rotation of asynchronous motors. Widely used frequency converters that feed asynchronous motors allow you to optimize production, reduce electrical energy consumption, increase the service life of equipment, etc. The article considers the system "frequency converter-asynchronous motor" as a complex nonlinear automatic control system. On the basis of the linearized transfer function of the frequency converter and the asynchronous motor, the block diagram of the open system "frequency converter - asynchronous motor"is made. The mathematical description of the system is written by algebraic controls in symbolic form. A program for generating the transfer function and calculating the roots of the characteristic equation using the MATLAB application package is presented. To determine the stability of the frequency converter - asynchronous motor system, a program is compiled where the stability of the system is determined by the characteristic roots of the equation. The transient curve of the speed and torque of an asynchronous motor confirms the adequacy of the block diagram "frequency converter-asynchronous motor" and its mathematical description.