Abstract
This paper dwells upon quantitative evaluation of the current displacement effect occurring in the buses located in AC machine bars, with evidence collected from a high-power magneto-electric generator. We herein specify the basic factors affecting the increase in currents observed in electric-machine buses. The paper presents examples of calculating the mean bus resistance increase by time-tested methods described in recognized scientific sources. We have also investigated the problem of modeling electromagnetic processes in ANSYS Maxwell, a CAD system. We make a specific emphasis on the functionality ANSYS Maxwell provides for graphical rendering of information derived from the simulation of electromechanical transducers. The presented graphical interpretation of generator simulation results makes it easier to understand the physics behind this phenomenon while also facilitating the use of the software. The two mentioned methods for quantitative current-displacement evaluation are herein further compared based on the experimental data AO NPO Elektromashina has obtained from the samples of a calculated high-power magnetoelectric generator. Judging from this comparison of two methods for quantitative evaluation of current displacement in AC generator windings, we find the preferable method for calculating the total energy loss in the windings of electromechanical transducers. We also analyze the losses occurring in high-power magneto-electric generators, which losses affect considerably the efficiency of electric machines. We thus find the condition of maximizing the efficiency of high-power electric machines.
Highlights
Введение В настоящее время проектирование электрических машин достаточно автоматизировано
We have investigated the problem of modeling electromagnetic processes in ANSYS Maxwell, a CAD system
The two mentioned methods for quantitative current-displacement evaluation are further compared based on the experimental data AO NPO Elektromashina has obtained from the samples of a calculated high-power magnetoelectric generator. Judging from this comparison of two methods for quantitative evaluation of current displacement in AC generator windings, we find the preferable method for calculating the total energy loss in the windings of electromechanical transducers
Summary
Bulletin of the South Ural State University. Ser. Применение системы автоматического проектирования ANSYS Maxwell для количественной оценки. И методом конечных элементов с использованием пакета ANSYS Maxwell. Полученный результат соответствует условию работы машины с максимальным КПД, как показано ниже. Условие работы электрической машины с максимальным КПД Запишем коэффициент полезного действия через коэффициент нагрузки: кнг кнг P2н кнг P2н Pмаг кн2г Pэл. Где кнг P2 P2н – коэффициент нагрузки электрической машины (при неизменном напряжении то же, что отношение текущей токовой нагрузки к номинальной, то есть кнг I2 I2н ); P2н – номинальная выходная мощность (прямо пропорциональна коэффициенту нагрузки, так как мощность от тока зависит практически линейно); Pмаг – магнитные потери при номинальной нагрузке (от тока практически не зависят, поэтому множитель отсутствует); Pэл – электрические потери при номинальной нагрузке (зависят от тока нагрузки во второй степени, поэтому множитель во второй степени). Запишем производную функции КПД и определим условие равенства ее нулю:
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