Кафедра електроніки та телекомунікації
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Item type:Наукова стаття, Modeling dynamic and static operating modes of a low-power asynchronous electric drive(2025-06-27) Lyshuk, Viktor; Moroz, Sergiy; Selepyna, Yosyp; Zablotskyi, Valentyn; Yevsiuk, Mykola; Satsyk, Viktor; Tkachuk, AnatoliiThe article presents a mathematical model of the asynchronous motor in oblique coordinates, based on differential equations expressedin the standard Cauchy form. The differential equations of traditional models are implicitly formulated; therefore, during numerical implementationfor prolonged processes, matrix coefficient rotation leads to significant time expenditure and the accumulation of errors during integration. This complex task is proposed to be addressed by ensuring that the differential equations of the electromechanical state are non-stiff and, importantly, writtenin standard Cauchy form. The standard Cauchy form is essential for analyzing asynchronous motors, as changes in the number of unknowns significantlyrestructure the coefficient matrix. This formulation of the equations is convenient for numerical integration, as explicit methods, which are considerably simpler than implicit methods, can be implemented. To create a mathematical model, coordinate transformations were performed based on the classical theory of electric machines. The advantage of the proposed method of using different coordinate axes is the possibility of analyzing new variablesand obtaining constant coefficients in the equations of state of the electric motor.The model accounts for the electromagnetic interactions of the motor’s electrical circuits and their nonlinearity, enabling the simulation of electromagnetic and electromechanical processes. Transitional operating modes of the asynchronous motor have been modeled and analyzed. The proposed model can be utilized for analyzing the operation of motors both as standalone elements and as components of an electromechanical system. It is demonstrated that this model aligns with classical electrical machine theory.Simulation results are provided, along with their analysis.Item type:Наукова стаття, Investigation of DC-AC converter with microcontroller control of inverter frequency(2025-03-31) Tkachuk, Anatolii; Polishchuk, Mykola; Polishchuk, Liliia; Kostiuchko, Serhii; Hryniuk, Serhii; Konkevych, LiudmylaThe paper discusses the key aspects of the development of a frequency-controlled direct current to alternating current (DC-AC) converterbased on a microcontroller. Electric energy converters play an important role in ensuring energy stability, especially in theconditions of frequentand unpredictable power outages, which are characteristic of Ukraine. Emphasis is placed on improving the parameters of the inverter to increaseits efficiency, stability of operation, and the possibility of using alternative energy sources, such as batteries and solar panels.The work investigatesthe structure and principle of operation of the inverter, which includes such main components as a direct current source, a MOSFET bridge,a low-frequency filter, and an output transformer. A voltage frequency control circuit using an ATmega328P microcontroller is proposed, which allowsfor maintaining a stable output voltage under conditions of changing input voltage parameters.The research methodology involved conductingan experimental analysis based on a symmetric non-composite Box-Benkin plan, which made it possible to optimize the designof the device. In particular, the influence of the parameters of the secondary winding of the transformer, the power of the transistors, and the input voltage on the output powerof the device was studied. The obtained results demonstrated the efficiency of the device with a rational choice of element base.In the courseof the research, a mathematical model of the process of optimizing the converter parameters was developed. It was concluded that increasing the powerof field-effect transistors and changing the geometrical parameters of the transformer contribute to increasing the performance of the device. Prospectsfor further research include modernization of the microcontroller software, integration of protective sensors, and adaptationof the device to workwith different types of loads.