REACTOR

摘要

Provided is a small reactor, the productivity and the radiation performance of which are excellent. A reactor (1a) is comprised of a coil obtained by helically winding a wire (2w); and a magnetic core (3) having an inner core portion inserted to the coil and an outer core portion (32) coupled to the inner core portion, wherein the both core portions form a closed magnetic circuit. The outer periphery of the coil is covered with an inner resin portion (4), to form a coil forming body (20a) wherein the shape of the coil is maintained. The outer periphery of a combined body (10) composed of the coil forming body (20a) and the magnetic core (3) is covered with an outer resin portion (5a). The reactor (1a) has no casing, and is small. An installation-side surface (core installation surface (32d)) of the outer core portion (32) is exposed from the outer resin portion (5a) and, accordingly, can be directly in contact with an object to be secured. Thus the radiation performance of the reactor is excellent. When the reactor (1a) is assembled, the coil can be easily treated because the reactor (1a) is provided with the coil forming body (20a). Thus, the productivity of the reactor is excellent.