The Principle Of Self-inductance And Mutual Inductance Of Ignition Coil

　　An inductor is a passive electronic component that stores electrical energy in the form of magnetic flux. Typically, the wire is wound, and when there is currently flowing through it, a magnetic field is created from the right side of the direction of current flow. The structure of the inductor is mainly composed of coil winding, magnetic core, and auxiliary supporting packaging material. Let's take a look at what is the self-inductance and mutual inductance of the ignition coil.

　　Self-inductance: When current flows through the coil, a magnetic field is generated around the coil. When the current in the coil changes, the magnetic field around it changes accordingly. This changing magnetic field can cause the coil itself to generate an induced electromotive force, which is self-inductance. called the self-inductance coefficient. Sometimes there are multiple coils in an inductor, and mutual inductance occurs when the coils interact with each other. The inductive relationship between them also becomes the mutual inductance.

　　Mutual inductance: When two ignition coils are close to each other, the magnetic field change of one ignition coil will affect the other ignition coil, which is called mutual inductance. The mutual inductance depends on the degree of coupling between the ignition coil and the two ignition coils. Components made with this principle are called transformers. It is a coil wound symmetrically around a closed magnetic loop in opposite directions with the same number of turns. An ideal common mode choke can suppress the common-mode interference between L and E, but not the differential mode interference between L and n.

　　In simple terms, the effect of generating an electromagnetic field on the wire itself is called "self-inductance", that is, the charging current generated by the wire itself produces a changing magnetic field, which in turn affects the current in the wire; the effect on other wires in this electromagnetic field is called "mutual inductance". ".