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Dependence of electric drive’s thermal state on its operation mode

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Category: Electrical complexes and systems

Last Updated on 21 July 2014

Published on 24 December 2013

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Authors:

O.S. Beshta, Corresponding Member of the National Academy of Science of Ukraine, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Vice-Rector for Science, Head of the Department of Electric Drives, Dnepropetrovsk, Ukraine.

V.S. Fedoreiko, Academician of the Academy of Economical Sciences of Ukraine, Dr. Sci. (Tech.), Professor, Ternopil National Pedagogical University, Head of the Department of Machine Science and Computer Engineering, Ternopil, Ukraine.

O.V. Balakhontsev, Cand. Sci. (Tech.), State Higher Educational Institution “National Mining University”, Senior Lecturer of the Department of Electric Drives, Dnepropetrovsk, Ukraine.

S.S. Khudolii, State Higher Educational Institution “National Mining University”, Assistant Lecturer of the Department of Electric Drives, Dnepropetrovsk, Ukraine.

Abstract:

Purpose. To estimate dependences between the operation mode parameters and the thermal state of induction motor and frequency converter in the variable frequency drive.

Methodology. The research implied application of indirect evaluation of temperatures in the nodes of variable frequency drive. The thermal models were applied for estimation of the drive’s thermal state and dependencies in question. The correlation between the operational mode’s parameters and the drive’s thermal state, and dependencies between the drive’s overload capacity and the mechanism’s duty cycle were theoretically grounded and verified experimentally. The variation of cooling intensity due to speed regulation was taken into account.

Findings. The dependencies of maximal motor nodes’ temperatures and the load duty cycle were obtained. We have proved that the motors with self-cooling systems have parabolic dependency meanwhile the motors with independent cooling have linear dependency. The regularities estimated can be used to employ the special maximal productivity strategy for the variable frequency drives with various cooling systems.

Originality. New dependencies between the operational mode’s parameters (load rate, duty cycle), parameters of thermal model and load capacity of the variable frequency electric drive have been obtained.

Practical value. The dependencies obtained can be used for preliminary dimensioning of induction motor with corresponding cooling type and frequency drive for the mechanisms with S3 load pattern (variable load).

References:

1. Спостерігач теплового стану асинхронного електропривода в контексті стратегії максимального використання його навантажувальної здатності / Є. Нолле, Н. Нойбергер, О.С. Бешта [та ін.] // Електромеханічні та енергозберігаючі системи. – 2012. – Вип. 4/2012 (20). – С. 20–24.

Nolle, Ye., Neuberger, N., Beshta, O.S., Khudolii, S.S., and Balakhontsev, O.V. (2012), “Thermal state observer for induction motor in the context of maximal load utilization strategy”, Elektromekhanichni ta enerhozberihaiuchi systemy, no. 4/2012(20), pp. 20–24.

2. Колб А.А. Теорія електроприводу / А.А. Колб, А.А. Колб – Дніпропетровськ: Національний гірничий університет, 2006. – 511 с.

Kolb, A.A., Kolb, A.A. (2006), Teoriia elektropryvodu [Fundamentals of Electric Drive], Dnipropetrovsk, Ukraine.

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