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电感L又可称自感或自感系数,它作为一个经常使用的物理量,由于其本身的抽象性与复杂性,因而往往会引起人们的费解。本文试图通过对电感L的讨论,以加深人们对其本质的认识。 1 电感L的意义 1.1 电感L就是每单位电流在电感器中引起的磁通匝链数。当电流通过电感器时,电流的磁场便在电感器中产生了磁通量。若通过每匝线圈的磁通量φ近似相等,则对具有N匝线圈的电感器来说,Nφ就称为该电感器的磁通匝链数。而每单位电流在电感器中引起的磁通匝链数就叫做该电感器的电感L。即:
Inductor L can also be called self-inductance or self-inductance coefficient. As a frequently used physical quantity, inductance L often causes people’s incomprehension due to its own abstraction and complexity. This article attempts to deepen people’s understanding of its essence through the discussion of inductance L. 1 The meaning of inductance L 1.1 Inductance L is the number of flux strands per unit current induced in the inductor. When the current passes through the inductor, the magnetic field of the current creates a magnetic flux in the inductor. If the magnetic flux φ passing through each turn of the coil is approximately equal, then Nφ is referred to as the number of flux links of the inductor for the inductor having a N-turn coil. The number of flux linkages per unit current in the inductor is called the inductance L of the inductor. which is: