Reactor, converter, and power conversion device

A reactor comprising:

• a coil;
• and
• a magnetic core,
• wherein the coil includes a winding portion,
• the winding portion has a rectangular tubular shape,
• the magnetic core is an assembly obtained by combining a first core portion and a second core portion,
• the magnetic core includes
• a first end core piece and a second end core piece that respectively face end surfaces of the winding portion,
• a middle core portion having a portion disposed inside the winding portion, and
• a first side core portion and a second side core portion that are disposed on an outer periphery of the winding portion with the middle core portion interposed therebetween,
• the first core portion and the second core portion are combined in an axial direction of the winding portion,
• the first core portion is constituted by a compact made of a composite material in which a soft magnetic metal powder is dispersed in resin,
• the first core portion has an E-shape having the first end core piece, a portion of the middle core portion, the first side core portion, and the second side core portion,
• the second core portion is constituted by a powder compact made of a base powder containing a soft magnetic metal powder, and
• the second core portion has a T-shape having the second end core piece and the remaining portion of the middle core portion,
• a length L21f of the first side core portion and a length L22f of the second side core portion are the same, and are longer than a length L1f of the portion of the middle core portion,
• a length L1s of the remaining portion of the middle core portion is shorter than the length L1f of the portion of the middle core portion, and is two times or less a length L3s of the second end core piece,
• each of the soft magnetic metal powder of the first core portion and the soft magnetic metal powder of the second core portion includes at least one of pure iron and an iron-based alloy, and
• the content of the soft magnetic metal powder in the compact made of the composite material is 20 vol % or more,
• the powder compact of the second core portion contains a smaller amount of resin and a larger amount of soft magnetic powder than the compact made of the composite material of the first core portion.