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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 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.
3
Content available Impact of voltage subharmonics and interharmonics on currents in single-phase induction motors
Pepliński Marcin
Scientific Journal of Gdynia Maritime University
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2021
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nr 119
45--53
EN
In very low power drives, a single-phase induction motor is used. This motor, like the 3-phase induction squirrel-cage motor, requires a voltage supply with suitable parameters – of suitable quality, in practice. In energy systems, voltage quality distortions may occur in connection with the deviation of the RMS voltage and the occurrence of harmonics, subharmonics and interharmonics in its waveforms. Subharmonics and interharmonics in the voltage waveforms are particularly detrimental to induction motors. They cause, for example, additional power losses, electromagnetic torque pulsation and motor vibrations. It should be stressed that the existing publications on the impact of the considered distortions on the induction squirrel-cage motor are almost only applicable to 3-phase machines. The article presents the results of research on the influence of subharmonic and interharmonic voltage components on the single-phase induction squirrel-cage motor.
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 Influence of voltage subharmonics on induction motors of various efficiency classes
Pepliński Marcin
Scientific Journal of Gdynia Maritime University
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2020
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nr 115
55--62
EN
Power quality disturbances related to voltage waveform distortions and effective value deviation are common in power systems. Apart from higher harmonics, subharmonics and interharmonics may also appear in voltage waveforms. The presence of the above-mentioned disturbances causes additional power losses and an increase in thermal loads on induction motors. In this paper, the results of the study of the influence of subharmonics present in voltage waveform on the currents in the investigated induction motors of standard efficiency class – IE1 and high efficiency class – IE3, are presented.
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