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Dynamics of alleviated startup synchronous motors with nonlinear capaci-tive energy storage

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Category: Electrical engineering

Last Updated on Tuesday, 29 July 2014 21:36

Published on Thursday, 17 October 2013 11:23

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Authors:

V.B. Nizimov, Dr. Sci. (Tech.), Professor, Dneprodzerzhinsk State Technical University, Senior Lecturer of the Department of Electrotechnics and electromechanics, Dneprodzerzhinsk, Ukraine.

S.V. Kolychev, Cand. Sci. (Tech.), Associate Professor, Dneprodzerzhinsk State Technical University, Senior Lecturer of the Department of Electrotechnics and Electromechanics, Dneprodzerzhinsk, Ukraine.

A.A. Snighko, Dneprodzerzhinsk State Technical University, master of vocational training of the Department of Electrotechnics and Electromechanics, Dneprodzerzhinsk, Ukraine.

Abstract:

Purpose. To study the synchronous motors starting modes dynamics with nonlinear capacitive energy stor-age for driving the rotation mechanism with considerable momentum static resistance while limiting the stator and start windings currents.

Methodology. To reach the goal we have proposed nonlinear capacitive energy storage. Its parameters vary as a function of slip. This allows to compensate the synchronous motor excitation winding inductance, and by reducing the phase shift between the vectors of the e.m.f. and the current flowing through the coil, to increase the electromagnetic torque generated by it. The checking of the basic theoretical positions was made by numerical modeling methodology. For the research of influence of the nonlinear energy storage we have calculated synchronous motor starting modes by Park-Gorev equations in relative units of the system “ x_ad ”

Findings. The analysis of the calculated dependence showed that, compared to starting with an additional resistor multiplicity f R8, start-up time СДСЗ-2000-100 motor with the proposed non-linear capacitive storage decreased by 20.8% from 1200 r.u. to 950 r.u. Starting torque decreased from 4.8 r.u. to 3 r.u., and the average asynchronous torque increased from 1.6 r.u. to 2.3 r.u. The current in the field winding, connected to the energy storage, reached the value of 6.5 r.u in the beginning of start-up. The average value of the stator current decreased from 6.2 r.u. to 5.8 r.u.

Originality. We have proposed the construction of the nonlinear capacitive energy storage, parameters of which depend nonlinearly on the frequency of the current flowing through it, and carried out theoretical studies of its influence on the asynchronous start of synchronous motor.

Practical value. The proposed non-linear capacitive energy storage can find its application in the starters for synchronous motors in driving systems of wide range of industrial machinery. 

References:

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Chornyy, A.P., Gladyr, A.I., Osadchuk, Yu.G., Kurbanov, I.R., Voshun, A.N. (2006), Puskovye sistemy nereguliruemykh elektroprivodov [Start-Up Systems of Unregulated Electric Drives], ChP Shcherbatykh F.V., Kremenchug, Ukraine.

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Pivniak, G.G., Kirichenko, V.I., Borodai, V.A., (2002), “A new direction to improve large synchronous motors”, Tehnichna elektrodynamika. Tematychnyi vypusk “Prob-lemy suchasnoi elektrotekhniky”, part 2, pp. 62–65.

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Pirmatov, N.B., Akhmatov, M.G., Kamalov, I.K., (2003), “The research of the synchronous motor with excitation in the longitudinal and transverse axes under shock loadings”, Electrichestvo, no. 2, pp. 64–65.

5. Низимов В.Б. Оптимизация пусковых режимов синхронных электроприводов с емкостными накопителями энергии / В.Б. Низимов, А.М. Съянов, А.В. Качура // Проблемы создания новых машин и технологий. Научные труды КГПУ. – 2002. – Вып. 1. – С. 145–150.

Nizimov, V.B., Syanov, A.M., Kachura, A.V., (2002), “Optimization of the starting mode of synchronous motors with capacitive energy storage”, Problemy sozdaniya novykh mashin i tehnologii. Nauchnye trudy KGPU, Vol.1, pp. 145–150.

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