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自感现象是一种特殊的电磁感应现象,是由于导体回路中电流发生变化而在自身回路中产生的电磁感应现象.其本质是:自身电流的变化,导致其产生的磁场发生变化,从而使通过线圈自身的磁通量发生变化,最终引起的电磁感应现象.当原来电流增大时,自感电动势与原来电流方向相反;当原来电流减小时,自感电动势与原来电流方向相同.因此,“自感”简单地说,就是“自我感应”.
Self-induction phenomenon is a special kind of electromagnetic induction phenomenon. It is an electromagnetic induction phenomenon that is generated in the self-loop due to the change of the current in the conductor loop. Its essence is: the change of its own current causes the magnetic field produced by it to change, so that The magnetic flux changes through the coil itself and eventually causes electromagnetic induction. When the original current increases, the self-induced electromotive force is in the opposite direction to the original current. When the original current decreases, the self-induced electromotive force is in the same direction as the original current. Therefore, Self-inductance “Simply put, it is ”self-sensing".