Classification by inductor form: fixed inductor, variable inductor.

According to the nature of magnetic conduction: hollow coil, ferrite coil, iron core coil, copper core coil.

By nature of work: antenna coil, oscillating coil, choke coil, trap coil, deflection coil.

According to the structure of winding: single-layer coil, multi-layer coil, honeycomb coil.