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1
Content available Line start permanent magnet synchronous motor supplied with voltage containing subharmonics
Gnaciński Piotr, Muc Adam, Pepliński Marcin
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2023
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nr 74 (146)
28--34
EN
The presented study examines the effect of voltage subharmonics, which relates to components of the frequency less than the fundamental voltage harmonic, and the currents and vibration of the line start permanent magnet synchronous motor. The obtained experimental results corresponded to a production motor with a rated power of 3 kW and a rated speed of 1500 rpm. The main purpose of our study was to highlight that the subharmonic value had a non-linear effect on the vibration level of the considered motor. It was found that for subharmonic values up to approx. 0.5% of the vibration level could be considered acceptable for long-term operation, whereas vibration caused by voltage subharmonics of values greater than approx. 0.8% might promote machine damage.
2
Content available Speed variations in cage induction motors under sinusoidal voltage modulation
Gnaciński Piotr, Hallmann Damian
Scientific Journal of Gdynia Maritime University
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2022
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nr 124
31--41
EN
A specific case of voltage fluctuations is sinusoidal voltage modulation, which is a superposition of the fundamental voltage component and the subharmonic and interharmonic components – that is components of frequency less than the fundamental one or not being an integer multiple of it. Depending on the phase angles of the subharmonic and interharmonic components, various cases of voltage modulation can be distinguished, like amplitude, phase and intermediate modulations. This paper deals with the effect of phase angles of the subharmonic and interharmonic components on speed variation. The results of FEM computations are presented for a cage induction motor with a rated power of 3 kW.
3
Content available Single-phase induction motor under voltage fluctuations
Pepliński Marcin, Adamczak Daniel, Gnaciński Piotr
Scientific Journal of Gdynia Maritime University
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2022
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nr 123
40--49
EN
Some of the most common power quality disturbances are voltage fluctuations. They are interconnected with the presence of voltage subharmonics and interharmonics. Voltage fluctuations, subharmonics and interharmonics exert a negative effect on various elements of a power system, including cage induction motors. This work is devoted to the impact of voltage fluctuations on the current of a one-phase induction motor. The results of empirical investigations are presented for sinusoidal amplitude modulations of various frequencies and are compared with the effects of voltage subharmonics occurring as a single power quality disturbance.
4
Content available Power losses and windings temperature of an induction machine under voltage subharmonics
Gnaciński Piotr, Pepliński Marcin, Hallmann Damian
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2020
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nr 63 (135)
51--57
EN
This paper deals with the effect of voltage subharmonics on power losses and heating of an induction motor. An increase in power losses in stator and rotor windings and their impact on windings temperature is presented for subharmonics of various frequencies. The results of this study’s investigations are provided for subharmonics occurring as a single power quality disturbance and combined with voltage deviation. The appropriate electromagnetic computations were performed with the finite element method, and thermal ones – with an analytical method.
5
Content available Preliminary Study of a 200-KW Induction Motor Supplied with Voltages Containing Subharmonics
Gnaciński Piotr, Klimczak Piotr
Scientific Journal of Gdynia Maritime University
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2019
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nr 111
47--56
EN
This work deals with the preliminary investigations of a 200-kW induction cage motor with a supply voltage featuring subharmonic injection. The results of the field calculations in the MAXWELL environment are presented for subharmonics of various frequencies. It was found that subharmonics occurring in real power systems can cause overheating and premature failure of this type of machine.
6
Content available Badania wstępne silnika o mocy 5600 kW w warunkach występowania subharmonicznych napięcia
Gnaciński Piotr, Klimczak Piotr
Maszyny Elektryczne : zeszyty problemowe
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2019
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Nr 1 (121)
55--60
PL
Artykuł poświęcony jest badaniom silnika o mocy 5600 kW przeznaczonym do napędu wentylatora o dużym masowym momencie bezwładności, zasilanym napięciem zawierającym subharmoniczne. Wyniki obliczeń polowych wykonane w środowisku Ansys Electronics (Ansys Electromagnetics) zostały przedstawione dla subharmonicznych napięcia o rożnych częstotliwościach. W artykule przedstawiono wpływ subharmonicznych napięcia na przebiegi prądu w uzwojeniu stojana, wahania momentu elektromagnetycznego oraz straty mocy. Stwierdzono, że subharmoniczne występujące w rzeczywistych systemach elektroenergetycznych mogą powodować znaczące wahania momentu elektromagnetycznego oraz wzrost strat w uzwojeniach silników dużej mocy. Wzrost strat jest szczególnie istotny w przypadku subharmonicznych o niskiej częstotliwości i może spowodować nadmierny wzrost temperatury uzwojeń. Praca maszyny z wyższą temperaturą uzwojenia może doprowadzić do szybszej degradacji termicznej układu izolacyjnego i do uszkodzenia silnika.
EN
This work deals with investigations of 5600 kW induction cage motor designed for driving a fan of high value moment of inertia, under supply voltage containing subharmonics injection. The results of field calculations in Ansys Electronics (Ansys Electromagnetics) environment are presented for subharmonics of various frequencies. The article presents the influence of subharmonic voltage on the stator windings current waveforms, electromagnetic torque fluctuations and power losses of the motor. It was found that subharmonics occurring in real power systems can cause significant fluctuations of the electromagnetic torque and increase in power losses of high power machines. The increase of power losses is particularly important in the case of low frequency subharmonics and it can cause excessive windings heating. The operation of high power machines with a higher stator windings temperature can lead to a faster thermal degradation of insulation system and motor destruction.
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