A reactor includes a coil, an annular magnetic core that forms a closed magnetic circuit when the coil is excited, a plurality of divided reactors arranged in parallel, and a holding member that holds the plurality of divided reactors in a state in which the divided reactors are arranged in parallel at a predetermined spacing. Each of the divided reactors includes a coil unit that is formed of a wound wire and constitutes a part of the coil and a core unit that passes through the coil unit from one end of the coil unit to the other end and constitutes a part of the magnetic core. The core unit has an inner core portion inserted through the coil unit, and outer core portions that protrude from both ends of the coil unit and extend in a direction that intersects the inner core portion.

A heat dissipation structure for the reactor includes a housing, a reactor body, and one or more heat dissipation pipes. Each of the one or more heat dissipation pipes is disposed in a cavity of the housing and is connected to the housing in a leak-tight manner, a closed cavity is formed between the one or more heat dissipation pipes and the housing, and the reactor body is disposed in the closed cavity. The above heat dissipation structure for the reactor allows to improve the heat dissipation effect of the reactor under the premise that protection requirements are met. The current carrying density of the coil of the reactor body can be increased and the diameter of copper wires can be reduced under the same conditions, thereby reducing the usage of copper and effectively reducing the cost and weight.

A reactor includes a coil having gaps between adjacent turns of a winding, a core inserted through the coil, and a heat-dissipating material that is in contact with a side face of the coil. The heat-dissipating material is inserted between the adjacent turns of the winding of the coil, and the thickness of the heat-dissipating material outside the coil in a direction of an axis of the coil is smaller than the thickness of the heat-dissipating material between the adjacent turns of the winding. By reducing the thickness of the heat-dissipating material outside the coil where contribution to coil cooling is small, the amount of the heat-dissipating material can be reduced without lowering the cooling performance to the coil.

A three-phase AC reactor according to an embodiment of the present invention includes three-phase coils that are not arranged in parallel, an input and output terminal block having an input and output unit having a parallel arrangement, and an external connection position change unit disposed between a coil end of each of the three-phase coils and the input and output terminal block to connect the coil end to the input and output terminal block.

A three-phase AC reactor according to an embodiment of the present invention includes three-phase coils that are not arranged in parallel, an input and output terminal block having an input and output unit having a parallel arrangement, and an external connection position change unit disposed between a coil end of each of the three-phase coils and the input and output terminal block to connect the coil end to the input and output terminal block.

There are provided a reactor, a reactor coil covering, and a method for manufacturing a reactor, which are capable of preventing peeling off of an insulation coat with which an outer peripheral surface of a winding is covered. A reactor includes a core, a coil disposed on an outer periphery of the core, and a resin mold portion partially covering and integrating the core and the coil. A winding of the coil has an outer peripheral surface covered with an insulation coat. At least one part of a surface of the coil is covered with a protective membrane to cover a boundary between adjacent turns of the coil.

There are provided a reactor, a reactor coil covering, and a method for manufacturing a reactor, which are capable of preventing peeling off of an insulation coat with which an outer peripheral surface of a winding is covered. A reactor includes a core, a coil disposed on an outer periphery of the core, and a resin mold portion partially covering and integrating the core and the coil. A winding of the coil has an outer peripheral surface covered with an insulation coat. At least one part of a surface of the coil is covered with a protective membrane to cover a boundary between adjacent turns of the coil.

An inductor array according to one or more embodiments of the invention includes: a plurality of internal conductors spaced apart from each other along a reference axis; a magnetic base body; a plurality of first external electrodes each connected to one end of associated one of the plurality of internal conductors; and a plurality of second external electrodes each connected to the other end of associated one of the plurality of internal conductors. The magnetic base body may include: a body portion having the plurality of internal conductors embedded therein; and a first high-permeability portion having a higher relative permeability than the body portion.

Provided is a reactor including a coil having a pair of winding portions; and a ring-shaped magnetic core, the magnetic core including: a pair of inner core portions arranged inside of the winding portions; and a pair of outer core portions respectively arranged outside of one end and outside of another end in an axial direction of the winding portions, the reactor including a non-magnetic reinforcing member that is arranged between the pair of winding portions and is coupled to the inner end surfaces of the pair of outer core portions. An axial rigidity of the reinforcing member is 2×10.sup.7 N/m or more. Here, the axial rigidity is a value obtained by multiplying the cross-sectional area of the reinforcing member perpendicular to the axial direction of the winding portions and the Young's modulus of the reinforcing member, and dividing the result by the length of the reinforcing member.

Provided is a reactor including a coil having a pair of winding portions; and a ring-shaped magnetic core, the magnetic core including: a pair of inner core portions arranged inside of the winding portions; and a pair of outer core portions respectively arranged outside of one end and outside of another end in an axial direction of the winding portions, the reactor including a non-magnetic reinforcing member that is arranged between the pair of winding portions and is coupled to the inner end surfaces of the pair of outer core portions. An axial rigidity of the reinforcing member is 2×10.sup.7 N/m or more. Here, the axial rigidity is a value obtained by multiplying the cross-sectional area of the reinforcing member perpendicular to the axial direction of the winding portions and the Young's modulus of the reinforcing member, and dividing the result by the length of the reinforcing member.