Air core inductor

Air core inductor is an electrical component used to store the energy resulting from current passing through it in a magnetic field.

Constructions:

• The basic construction of air core inductor it consist of coils having number of turns of wire wound on a former made of ordinary cardboard.
• The plastic or ceramics may be used for a former as an insulating material.
• Since there is nothing but air inside of former, the inductor is known as air core inductor.
• The gap inside a plastic or paper former acts as a core. Thus air acts as a core.
• The magnetic wire wound on the former from the coil of the inductor.

Requirement of air core coil

The main requirements of air core coils are as given below,

• Stability of inductance.
• Low self capacitance.
• Reasonable size and cost.
• Low temperature coefficient.
• High ratio of inductive reactance to effective loss resistance at operating frequency.