During the application of magnet wire due to various reasons, its temperature will slowly rise and then become hot. If the temperature reduction measures are not taken in time, the magnet wire may be burnt. Therefore, when the magnet wire is hot, it is necessary to find out the reason, and then find a way to lower the temperature to avoid the magnet wire from being burned. Let's briefly talk about the reasons and solutions that cause magnet wire to heat up.
If it is a DC electromagnet, to reduce the temperature of the energized coil, it is necessary to convert the energy consumed in the resistance into heat and reduce the temperature in the wire.
In the case of an AC electromagnet, the temperature rise of its coil is not only due to the influence of its resistance, but also because of the temperature rise of the iron core. If there is an induction current in the iron core in the AC magnetic field, a part of the electric energy will be lost, and the temperature of the iron core will rise due to this. The induction cooker also uses this principle to increase the temperature. Since the coil is wound on the iron core, after the heat is transferred to the coil, its temperature will be reduced. To amplify the induced current loss in the iron core, the AC electromagnet is similar to the transformer, and it is best to use mutual parts. The insulating silicon steel sheet is used as the iron core, and its loss is amplified, and the temperature of the coil can be reduced.
However, if the electromagnet is always energized and its temperature only rises to about forty degrees, this phenomenon is normal, so don't worry.