Patent ID: 8754739

Claim:
A reactor comprising one coil formed by winding a wire, a magnetic core arranged inside and outside the coil and forming a closed magnetic circuit, and a case for housing an assembly of the coil and the magnetic core, wherein the coil is constructed and arranged such that the coil has an end surface shape that is non-circular and that includes a curved portion, the coil is housed in the case with an axial direction of the coil being parallel to an outer bottom surface of the case, the outer bottom surface configured to be cooled by an installation target, and a part of an outer peripheral surface of the coil is covered with the magnetic core, and at least a portion of a remaining part thereof not covered with the magnetic core is contacted with an inner bottom surface of the case, and wherein the magnetic core includes an inner core portion arranged inside the coil, and an outer core portion covering the part of the outer peripheral surface of the coil, the inner core portion being formed of a powder compact, the outer core portion being made of a mixture of magnetic powder and resin, and the inner core portion has a higher saturation magnetic flux density than the outer core portion, and the outer core portion has a lower magnetic permeability than the inner core portion; and wherein the inner bottom surface of the case includes a pedestal on which the coil is disposed, the pedestal including a coil groove formed following a part of the outer peripheral surface of the coil.