Abstract: The coil component includes a coil, a first core having a first magnetic permeability, and a second core having a second magnetic permeability lower than the first magnetic permeability. The first core and the second core form a magnetic path. The coil forms two or more winding windows. The first core contacts with an entirety of one side line extending in a second direction of each of the winding windows, and protrudes from both ends of one side line of at least one of the winding windows. The second core contacts with three side lines other than the one side line of each of the winding windows. A surface resistance of the first core between two points that are 20 mm away from each other is not less than 5 ? after a high-temperature storage test. A drive frequency of the coil component is not less than 20 kHz.

Abstract: A reactor comprises a coil member and a core member. The coil member comprises an insulation-coated conductive wire and an insulation coating. The insulation-coated conductive wire is wound and coated, at least in part, with the insulation coating. The core member comprises a first member and a second member. The first member has a relative permeability higher than another relative permeability of the second member. The second member includes a composite magnet, and the relative permeability of the second member is between 1 and 30 (both inclusive). The composite magnet is formed of a hardened binder and magnetic particles dispersed in the binder. The composite magnet has an elastic modulus that is one hundred times or more than another elastic modulus of the insulation coating.

Abstract: A reactor comprises a coil member and a core member. The coil member comprises an insulation-coated conductive wire and an insulation coating. The insulation-coated conductive wire is wound and coated, at least in part, with the insulation coating. The core member comprises a first member and a second member. The first member has a relative permeability higher than another relative permeability of the second member. The second member includes a composite magnet, and the relative permeability of the second member is between 1 and 30 (both inclusive). The composite magnet is formed of a hardened binder and magnetic particles dispersed in the binder. The composite magnet has an elastic modulus that is one hundred times or more than another elastic modulus of the insulation coating.