Air core coil

Japanese: 空心コイル - くうしんこいる

…Almost all electromagnetic induction elements used as elements in electric circuits use coils, so the term coil can also refer to these elements. The path of the magnetic flux generated by passing an electric current through a coil can be divided into air-core coils, in which the insulator is air or a non-magnetic material, and cored coils, in which the insulator is a magnetic material. Iron, silicon steel, ferrite, etc. are used for the magnetic core. …

From [Magnet]

...A permanent magnet is one that uses ferromagnetic materials (including ferrimagnetic materials) to maintain magnetization, while an electromagnet is one that uses a coil made of conductor wire and creates a magnetic field by passing an electric current through it. Electromagnets can be divided into those that have a ferromagnetic core (called a magnetic core) in the coil and those that do not, and those that do not have a magnetic core are sometimes called air-core coils and are distinguished from electromagnets. To create a very strong magnetic field, a large current is passed through an air-core coil, and for this, superconducting magnets, which use superconductors for the conductor wire, are very useful. ...

*Some of the terminology explanations that mention "air-core coils" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…電気回路の素子として使用される電磁誘導素子がほとんどすべてコイルを用いているため，コイルというとこの素子を指すこともある。コイルに電流を流すことによって発生する磁束の通路が，空気や非磁性材料絶縁物である空心コイルと，磁性材料である有心コイルに分けられる。磁心には鉄，ケイ素鋼，フェライトなどが用いられる。…

【磁石】より

…強磁性体(フェリ磁性体を含む)を用い磁化を保つようにしたものを永久磁石，導線でコイルをつくり，電流を流して磁場をつくり出すものを電磁石と呼ぶ。電磁石にはコイルの中に，強磁性体の心(磁心という)をもつものともたないものとがあり，磁心をもたないものを空心コイルとして電磁石と区別する場合もある。非常に強い磁場をつくる場合には空心コイルに大電流を流すが，これには超伝導体を導線に用いる超伝導磁石が非常に有用である。…

※「空心コイル」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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