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Investigation of the influence of the quality of the power supply system on the characteristics of an asynchronous motor with a squirrel-cage rotor

Goolak Sergey, Gubarevych Oleg, Gorobchenko Oleksandr, Nevedrov Oleksandr, Kamchatna-Stepanova Kateryna

Przegląd Elektrotechniczny

2022

R. 98, nr 6

142--148

The paper presents the results of studies of the influence of the quality of power systems on the characteristics of an asynchronous electric motor with a squirrel-cage rotor. During the research, a mathematical model of an induction motor, made in the MATLab software environment, was used. Based on the simulation results, the coefficients of the torque ripple and the phase current unbalance were determined. The results obtained are compared with previous studies of the manifestation of turn-to-turn closures in the phases of the motor stator winding, which also create an asymmetry of the rotating magnetic field.

W artykule przedstawiono wyniki badań wpływu jakości układów zasilających na charakterystyki silnika indukcyjnego ze zwartym wirnikiem. W badaniach wykorzystano model matematyczny silnika indukcyjnego wykonany w środowisku oprogramowania MATLab. Otrzymane wyniki porównuje się z wcześniejszymi badaniami występowania obwodów międzyzwojowych w fazach uzwojenia stojana silnika, które również tworzą asymetrię wirującego pola magnetycznego.

Sharp transition of laser-induced periodic ripple structures

Yang H., He H., Zhou L., Qian J., Hao J., Zhu H.

Optica Applicata

2012

Vol. 42, nr 4

795--803

Laser-induced periodic surface structures (LIPSS) (ripple) with different spatial frequencies have been observed after irradiation of stainless steel surfaces by femtosecond laser pulses in the air. Low spatial frequency LIPSS (LSFL) with the period (about 830 nm) close to the laser wavelength and high spatial frequency LIPSS (HSFL) with half wavelength (about 410 nm) were dependent on the scanning speed of laser focus. The sharp transition from the single LSFL to double HSFL structures occurs at 5 mm/s. This abrupt transition of dividing one ripple into two equals was proved.

SWAT.nz: New-Zealand-based “Sand Waves and Turbulence” experimental programme

Coleman S. E., Nikora V. I., Melville B. W., Goring D. G., Clunie (Dougal) T. M., Friedrich H.

Acta Geophysica

2008

Vol. 56, no. 2

417-439

The SWAT.nz ("New-Zealand-based Sand Waves and Turbulence") research programme was carried out to advance understanding of subaqueous sand waves. The programme was based around detailed measurements at varying scales of bed morphologies and associated flow fields as sand waves formed from plane-bed conditions and grew to equilibrium. This paper outlines the philosophy and details of the SWAT.nz programme, with the aim of providing insight into experiment and analysis design and methodologies for studies of highly-variable bed surfaces and flows. Example challenges addressed in the SWAT.nz programme include the measurement over large spatial domains of developing flow fields and three-dimensional bed morphology, including flow measurements below roughness (sand-wave) crests, and how to interpret the collected measurements. Insights into sand-wave dynamics that have arisen from the programme are presented to illustrate the values of the SWAT.nz programme and the developed methodologies. Results are presented in terms of mobile-bed processes, and flow-bed interaction and flow processes for fixed-bed roughness and erodible beds, respectively.