High-Power Induction Motors Supplied with Voltage Containing Subharmonics

Piotr Gnaciński and Piotr Klimczak
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Piotr Gnaciński: Department of Ship Electrical Power Engineering, Faculty of Marine Electrical Engineering, Gdynia Maritime University, 81-225 Gdynia, Poland
Piotr Klimczak: Diagnostic and Service of Electrical Motors Department, Zakład Maszyn Elektrycznych “EMIT” Cantoni Group, 99-320 Żychlin, Poland

Energies, 2020, vol. 13, issue 22, 1-15

Abstract: In some power networks, components of frequency less than the frequency of the fundamental voltage harmonic called subharmonics or subsynchronous interharmonics occur. In this paper, the effect of voltage subharmonics on currents, power losses, speed fluctuations and electromagnetic torque is examined. The results of numerical computations using the finite element method for an induction cage motor of rated power of 5.6 MW and four motors of rated power of 200 kW with different numbers of poles are presented. An extraordinary harmful effect on high-power induction motors is demonstrated. Among other effects, voltage subharmonics cause significant torque pulsations whose frequencies may correspond to the elastic-mode natural frequency. Possible resonance can result in excessive torsional vibration and the destruction of a power train.

Keywords: induction motors; interharmonics; power losses; power quality; power system; subharmonics; voltage fluctuations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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