Direct current electromagnet is extensively used as electromagnet controlling element. PTC element is a ceramic thermistor with positive temperature coefficient.

直流电磁铁是广泛应用的电磁控制元件，PT C元件是具有正温度系数特性的半导体陶瓷热敏电阻。

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This paper discusses the application of PTC element in the starting of direct current electromagnet according to the working principle of electromagnet and the current time relation of PTC.

本文根据电磁铁的工作原理和PTC元件的电流时间特性，探讨了PTC元件在直流电磁铁启动中的应用。

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Break-brake operations have three kinds of break-brake electromagnet, over-current trip and manual button.

分闸操作有分闸电磁铁，过电流脱扣电磁铁及手动按钮操作三种。

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That is because a permanent magnet's maximum strength is dictated by the material it is made from, while an electromagnet's strength depends on the current passing through it.

ECONOMIST: Maglev trains

Each segment has an electromagnet attached to it, and these are activated by a current that flows from head to tail in more or less the way that a nerve signal flows in a real animal.

ECONOMIST: Robots