Three-phase reactor comprising iron-core units and coils

A three-phase reactor comprising:

• an outer peripheral iron core;
• and
• at least three iron-core coils that come in contact with an inner surface of the outer peripheral iron core or are joined to the inner surface,
• wherein the at least three iron-core coils comprise corresponding iron cores and corresponding coils wound around the iron cores;
• each of the iron cores extends only in a radial direction of the outer peripheral iron core;
• the three-phase reactor further comprises a plurality of inter-coil iron cores arranged between the at least three iron-core coils, wherein the cross sections of each of the plurality of inter-coil iron cores are pentagons of which two sides are parallel to each other;
• and gaps that-can magnetically connect the at least three iron-core coils and the plurality of inter-coil iron cores to each other are formed between the at least three iron-core coils and the inter-coil iron cores, wherein the plurality of inter-coil iron cores are arranged radially inward of the radially inner ends of the iron cores.