Тип публикации: статья из журнала
Год издания: 2019
Ключевые слова: inductor of longitudinal magnetic field, three-phase induction device, switching the triangle of windings into a star, vector diagram of magnetic fluxes, nonlinear multiphase model of a magnetic circuit, asymmetry of the three-phase frequency inverter mode
Аннотация: The peculiarities of the configuration of the magnetic field of an induction device designed to influence the molten metal are considered. The windings of the induction machine are made switchable, from a triangle into a star, which ensures the operation of the device when pumping, transporting, or mixing aluminum alloys. Heating tПоказать полностьюhe melt with a field is able to ensure the removal of aluminum plugs at the start, as well as to compensate for heat losses during casting. The device is one of the varieties of linear MHD machines with a core and windings, with a variable number of pole pairs. The sequence of switching windings is determined by the algorithm of the control unit modules. Due to the open configuration of the magnetic circuit of the MHD inductor, asymmetry of the magnetomotive forces of the windings occurs, which leads to a distortion of the low-frequency traveling magnetic field. The nature of the asymmetry of the electromagnetic mode of the shortened inductors for different winding switching circuits can be estimated from the model of the magnetic circuit. The distribution of magnetic flux vectors is estimated from the results of an iterative calculation of a nonlinear multiphase magnetic circuit of an induction machine. For the scheme of separate switching on the phases of the inductor, there is a software-algorithmic method for controlling the power switches of a three-phase IGBT inverter operating at lower frequencies. Regulation of the force and intensity of heating is performed by redistributing by the linear current load between the phases of the inductor. With the proper choice of the winding connection scheme, the proposed device provides a continuous circular raster of flows in the cores, creating uniform traction forces and increasing the effect on the melt.
Журнал: Norwegian Journal of Development of the International Science
Выпуск журнала: № 4-1
Номера страниц: 45-52
ISSN журнала: 34539875
Место издания: Осло
Издатель: Global Science Center LP