An inductor is an elem習小ent that can store electrical ene影可rgy into magnetic energy an風低d store it. The structure光房 of the inductor is 件紙similar to a transformer, but with 影他only one winding. The ind錢線uctor has a certain ind站暗uctance that only block鄉姐s the change in curre市北nt. If the inductor is in a 雨唱state where no current is flowin自藍g, it will attempt to block curr議物ent flow through it when the ci一河rcuit is turned on; if 開弟the inductor is in a state where curre讀劇nt is flowing, it will a間一ttempt to maintain the current when the志員 circuit is turned off. In城厭ductors are also known a明大s chokes, reactors, and dynamic reactor跳朋s.
development path
The most primitive inductor was t的熱he iron core coil used by the Bri朋要tish M. Faraday in 1831 to discover ele在機ctromagnetic induction. I呢作n 1832, J. Henry of the Unit音務ed States published a paper子都 on the phenomenon of self-induct短錢ion. People refer to 懂玩the unit of inductanc朋森e as Henry, referred to as Henry睡劇. In the mid-19th century, inductors跳為 were put into practical use in tel相這egraphs, telephones and othe報個r devices. In 1887, H.R. Hertz要刀 of Germany, in 1890, the i高弟nductors used by N. Tesla in the Unite話雜d States were very famous媽城, called Hertz coils and Tes國照la coils.
Inductance classification
Self-inductor
When a current is pass離做ed through the coil, a magnetic fi師海eld is generated arou拍些nd the coil. When the current in th火從e coil changes, the sur城志rounding magnetic fie訊火ld also changes accordingly. T黃這he changed magnetic field c要喝an cause the coil itself t視個o generate an induced electromoti如美ve force (induced elect司樂romotive force) (the聽如 electromotive force is used to rep公個resent the terminal vo跳是ltage of the ideal power source o行作f the active component)員來. It is self-consciousness.
An electronic component tha藍生t is wound by a wire and has a certain答兵 number of turns and can generate 請文a certain amount of self-ind子筆uctance or mutual inductanc紙街e, which is often called an ind身數uctive coil. In order 姐靜to increase the inductanc少大e value, improve the qualit日化y factor, and reduce the volume, a北黑 core or core made of f為謝erromagnetic material is often adde子吃d. The basic parameters of the induc如家tor are inductance, q嗎報uality factor, inherent capaci是關tance, stability, curre村討nt passed, and frequ看就ency of use. An inductor consisting 車場of a single coil is calle又線d a self-inductor, and its se妹木lf-inductance is also cal鐘拍led a self-inductance coeffici玩還ent.
Transformer
When the two inducto紅湖r coils are close to each other, the ch姐月ange in the magnetic f件海ield of one inductor業鄉 coil will affect the other i人火nductor coil. This effect i雨術s mutual inductance. The m物嗎agnitude of the mutual inductance depe湖師nds on the degree to which the induct信分ance of the inductor is couple妹做d to the two inductor作商s. The component made by t土討his principle is called a transformer.街學
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