# DYNAMIC REGIMES OF ASYNCHRONOUS MOTORS WITH CONCATENATED CAPACITORS

## Authors

• V. S. Malyar Lviv Polytechnic National University, Ukraine
• V. S. Maday Lviv Polytechnic National University, Ukraine
• I. A. Dobushovska Lviv Polytechnic National University, Ukraine

## Keywords:

asynchronous motor, compensation of reactive power, starting characteristics, resonance, capacitors, subharmonіc oscillations

## Abstract

Purpose. Development of mathematical model for calculation of starting modes of asynchronous motor connected in series with capacitors. Method. Mathematical modeling of dynamic modes of asynchronous motors with lateral capacitor compensation of reactive power. Results. The calculation algorithm and results of mathematic modeling of processes during starting modes of asynchronous motor feeding from the network through capacitors connected in series are presented. It is shown that for some values of capacitance the self-excitation processes and subharmonic oscillations can appear. Scientific novelty. Mathematic modeling and research of processes in asynchronous motor under its feeding through capacitors is carried out for the first time. The calculation algorithm is based on the mathematical model of asynchronous motor with high level of adequacy, which takes into account the magnetic core saturation and the current displacement in limbs of the rotor. Practical implication. Developed mathematical model makes it possible to investigate the possibility of self-excitation modes appearing in condition of their feeding from line with lateral compensation of reactance in order to avoid the negative effects typical for them.

## References

Golovan А.Т., Zhang Chen-Shen. Mechanical swinging asynchronous motors with a series connection capacitors. Elektrichestvo – Electricity, 1962, no.10, pp. 12-15. (Rus).

Dancis J.B., Zulov G.М. Emkostnaja kompensacija reaktivnyh nagruzok moshhnyh tokopriemnikov promyshlennyh predprijatij [Capacity indemnification of reactive power for powerful consumers of industrial enterprises]. Мoscow, Energija Publ., 1980. 176 p. (Rus).

Rydnickyj V.G., Bondarenko V.V. Analysis of the occurrence of self-excited of asynchronous motors with a series connection capacitors in the device voltage and reactive power control. Elektromashinostoenie i elektrooborudovanie – Electrical Engineering and Electric Equipment, 2006, no.66, pp. 232-233. (Ukr).

Filc R.V. Matematicheskie osnovy teorii elektromehanicheskih preobrazovatelej [Mathematical foundations of electromechanical transducers theory]. Кyiv, Naukova Dumka Publ., 1979. 208 p. (Rus).

2015-04-28

## How to Cite

Malyar, V. S., Maday, V. S., & Dobushovska, I. A. (2015). DYNAMIC REGIMES OF ASYNCHRONOUS MOTORS WITH CONCATENATED CAPACITORS. Electrical Engineering & Electromechanics, (2), 14–15. https://doi.org/10.20998/2074-272X.2015.2.02

## Section

Electrical Machines and Apparatus