Reactor

摘要

A reactor having a good heat dissipation effect is provided. The reactor includes 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. An end surface of the coil has a race track shape, and the coil is housed in the case such that the axial direction of the coil is parallel to an outer bottom surface of the case. A part of an outer peripheral surface of the coil is covered with the magnetic core (outer core portion), and a remaining part thereof not covered with the magnetic core is contacted with an inner bottom surface of the case. Since a part (mainly a linear portion) of the outer peripheral surface of the coil is directly contacted with the inner bottom surface of the case, heat of the coil can be directly dissipated such that the heat is released through the case to an installation target, e.g., a water cooling base, on which the case is installed. Thus, the reactor has a good heat dissipation effect.

主权项

1. 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, anda 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, andthe 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.