Reactor, core part for reactor, converter and power conversion device

A reactor having a cylindrical coil and a magnetic core where the coil is disposed, the reactor comprising:

• a stacked columnar body which configures a portion disposed on an inside of the coil in the magnetic core and in which a plurality of core pieces made of a magnetic material and at least one gap member made of a material having a lower magnetic permeability than the plurality of core pieces are stacked;
• and
• coating resin which coats the stacked columnar body and is molded integrally,
• wherein at least one end surface of the stacked columnar body is made of one of the plurality of core pieces, and
• wherein the coating resin includes a peripheral surface coating portion for coating at least a part of an outer peripheral surface of the stacked columnar body to integrally hold the plurality of core pieces and the gap member and an end surface coating portion for coating at least a part of the end surface, which is made of the one of the plurality of core pieces, of the stacked columnar body,
• wherein the peripheral surface coating portion includes a base coating portion having a tapered shape with a small thickness from one end surface side toward the other end surface side in the stacked columnar body provided with the end surface coating portion, and a rib protruded from a surface of the base coating portion and extended in an axial direction of the stacked columnar body, and
• wherein a protrusion height of the rib is increased from the one end surface side toward the other end surface side in the stacked columnar body provided with the end surface coating portion.

A core part for a reactor to be used for a magnetic core where a cylindrical coil is disposed, the core part comprising:

• a stacked columnar body in which a plurality of core pieces made of a magnetic material and at least one gap member made of a material having a lower magnetic permeability than the plurality of core pieces are stacked;
• and
• coating resin which coats the stacked columnar body and is molded integrally,
• wherein at least one end surface of the stacked columnar body is made of one of the plurality of core pieces, and
• wherein the coating resin includes a peripheral surface coating portion for coating at least a part of an outer peripheral surface of the stacked columnar body to integrally hold the plurality of core pieces and the gap member and an end surface coating portion for coating at least a part of the end surface, which is made of the one of the plurality of core pieces, of the stacked columnar body,
• wherein the coil includes a pair of coil elements,
• wherein the stacked columnar body is disposed on an inside of one of the pair of coil elements, and
• wherein the coating resin includes the peripheral surface coating portion and the end surface coating portion which coat the stacked columnar body, and a frame-shaped portion which is provided between a portion where both of the coil elements are not disposed in the magnetic core and end surfaces of both of the coil elements, and is molded integrally with the end surface coating portion,
• wherein the end surface coating portion coats only a part of one end surface of the stacked columnar body and the other portion of the one end surface is exposed from the coating resin, and
• wherein the frame-shaped portion includes the end surface coating portion and a through hole in which another stacked columnar body disposed on an inside of the other of the pair of coil elements is inserted.