Потери в железе рассчитываются из суммы потерь на вихревые токи и потерь на гистерезис. Их трудно точно рассчитать заранее, так как на значения влияют местные условия течения и обработка листов. Поскольку потери в железе зависят от изменения плотности магнитного потока, конкретные значения на кг железа приведены для выбранной плотности потока, направления потока и частоты. В зависимости от качества железа и толщины листа, потери железа составляют от 0,8 до 12 Вт/кг при плотности потока 1,5 Т и частоте 50 Гц.
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