A coil component includes: first and second magnetic cores having first and second flat plate portions; a winding having a hollow core portion; first and second heat dissipation metal plates having first and second heat dissipation plane and first and second heat conduction portions, at least either one of the first and second flat plate portions has a middle leg, the middle leg is inserted into the hollow core portion of a winding, and the first magnetic core and the second magnetic core are combined in such a way that the first flat plate portion and the second flat plate portion face each other, the first heat dissipation plane portion is closely attached to the first flat plate portion and the second heat dissipation plane portion is closely attached to the second flat plate portion, the first heat conduction portion is connected to the second heat conduction portion.

A manufacturing method of a magnetic element includes the following steps: forming a block including a central post and at least one lateral post with magneto-conductive materials; cutting the block along a first plane passing through the central and lateral posts to form a first half body and a second half body; combining the first half body with the second half body to form a first air gap between the central post of the first half body and the central post of the second half body and a second air gap between the lateral post of the first half body and the lateral post of the second half body; and cutting or grinding the combined first half body and second half body along a second plane passing through the central post and the lateral post to form a third half body including the first and second air gaps.

In an embodiment, a coil component 10 has a drum core 20 housed in a through hole 32 of a ring core 30, and two types of securing parts are provided in a gap G between an outer circumference of one flange part 24 of the drum core 20 and an inner circumference of the through hole 32. Terminal electrodes 50A, 50B connecting to ends 46A, 46B pulled out from a winding wire 40 wound around the drum core 20 are assembled to the ring core 30. Second securing parts 60A, 60B are arranged to opposite to each other with respect to a center C of the flange part 24, and first securing parts 62A, 62B are provided to cover an outer side of the second securing parts 60A, 60B. A hardness of the second securing part is higher than that of the first securing part.

A surface-mount inductor having a molded body which includes a coil formed by winding a rectangular wire and sealed by sealant having resin and filler, a surface of the molded body being a mounting face, the coil includes: first rolls wound in two-roll arrangement along the winding axis, the ends of the wire being placed at the outermost turn; and second rolls wound in positions adjacent to the first rolls and oppositely shifted along the winding axis, the inner diameter being equal to or larger than the outer diameter of the first rolls, the ends of the wire are brought out from the outermost turn of the second rolls as lead ends which are sealed in a manner that the winding axis is parallel with the mounting face and the lead ends are partially exposed at the mounting face, as well as a method for manufacturing the same.

An inductor has one or more wires and a multipart magnetic core. The multipart magnetic core has magnetic core parts that are adjacent and magnetically coupled. The inductor provides an inductance of at least 40 nH for currents greater than 1 A and less than 60 A, and at least 20 nH for currents of at least 60 A.

A magnetic core may have one or more notches in a center post, backplate and/or outer rim. Such notches may reduce or eliminate dimensional resonance and/or reduce the amount of magnetic material. A magnetic core with or without notches may omit a backplate and/or an outer rim.

An inductor module includes at least one first magnetic core, a second magnetic core and at least one winding assembly. Each first magnetic core includes a connection part, a first post and a second post. The first post and the second post are disposed on a top surface of the connection part. A winding groove is formed between the first post and the second post. The second magnetic core is disposed adjacent to the first magnetic core. Each winding assembly is formed by wrapping a single metal sheet for at least one turn. Each winding assembly is disposed around the first post. A portion of each winding assembly is accommodated within the winding groove of the corresponding first magnetic core. An overall thickness of the winding assembly within the winding groove is smaller than or equal to a width W of the winding groove and greater than 0.9×W.

An inductor includes a body including a magnetic body having a coil embedded therein and containing magnetic powder. The coil has a winding portion in which a conductive wire is wound around and has a pair of lead portions taken out from the winding portion. The inductor also includes a pair of outer electrodes formed on the body. In the inductor, each of the lead portions is exposed from at least one side surface of the magnetic body and is coupled to a corresponding outer electrode. In addition, with respect to a position at which each of the lead portions is exposed from the at least one side surface of the magnetic body, a magnetic powder content in a region closer to one of the principal surfaces is higher than a magnetic powder content in a region closer to the other one of the principal surfaces.

A coil device includes a first core, a second core, and a conductor. The first core includes a first leg. The second core is disposed with a gap between the first leg and the second core. The conductor is at least partly disposed between the first core and the second core. A notch is formed on the conductor at a position corresponding to the gap.

A continuous coil for an inductive component includes a plurality of turns formed by at least one conductor. The continuous coil is substantially egg-shaped. Other example coils, transformers, etc. are also disclosed.