Inductor, device equipped with inductor and method for manufacturing inductor

Patent metadata

Field	Value
Publication number	US-12340933-B2
Application number	US-201916963037-A
Country	US
Kind code	B2
Filing date	Jan 17, 2019
Priority date	Jan 18, 2018
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

An example inductor comprises multiple coil parts and each formed by flatwise-winding layers of turns of a flat wire arranged in a radial direction with gaps between each of the layers, and the multiple coil parts are arranged in an axial direction with a clearance. There is provided a clearance between the multiple coil parts, through which air flows, achieving improvement in heat dissipation.

First claim

The invention claimed is:

1. An inductor comprising a plurality of coil parts each formed by flatwise-winding layers of turns of a flat wire arranged in a radial direction with gaps between each of the layers, wherein
the plurality of coil parts are arranged in an axial direction with a clearance,
the plurality of coil parts include a first coil part and a second coil part that are axially adjacent to each other,
the clearance is sandwiched between the first coil part and the second coil part in the axial direction,
the first coil part and the second coil part are disposed such that the gaps between the turns of the flat wire for the first coil part are axially continuous with the gaps between the turns of the flat wire for the second coil part,
the inductor further comprises a cooling fan which is arranged so that a flow of air is produced through the gaps between the turns of the flat wire for the first coil part, through the gaps between the turns of the flat wire for the second coil part and through the clearance between the first coil part and the second coil part, and
the inductor further comprises a connection part that connects the flat wire located most inwardly in the first coil part and the flat wire located most inwardly in the second coil part, wherein
the connection part is included in inner peripheral surfaces of the first coil part and the second coil part,
an area inside the first coil part and the second coil part is hollow,
each of the coil parts is formed by winding so as to be quadrilateral when viewed from an axial direction,
the first coil part and the second coil part are formed by alpha-winding,
an end portion of the flat wire located at the outermost turn of the first coil part extends outward so as to be in parallel with a side of the first coil part along a circumferential direction of the first coil part, and the end portion forms a first terminal, and
an end portion of the flat wire located at the outermost turn of the second coil part extends outward so as to be in parallel with a side of the second coil part along a circumferential direction of the second coil part, and the end portion forms a second terminal.

2. The inductor according to claim 1 , wherein the flat wire is wound such that a ratio of a radial dimension to an axial dimension of a portion corresponding to the layers of turns of the flat wire is a preset ratio for the plurality of coil parts.

3. The inductor according to claim 2 , wherein the ratio of the radial dimension to the axial dimension is approximately 1.

4. A device equipped with the inductor according to claim 1 .

5. The inductor according to claim 1 , wherein the flat wire located most inwardly in the first coil part and the flat wire located most inwardly in the second coil part comprise the connection part.

Assignees

• Daihen Corp
• National Institute Of Tech

Inventors

• Nakahama Masayuki
• Maeda Kosuke
• Ebisawa Mitsuo
• Ishitobi Manabu

Classifications

• H03H7/40

  Automatic matching of load impedance to source impedance · CPC title

• H01F41/061

  Winding flat conductive wires or sheets · CPC title

• H01F41/04

  for manufacturing coils {(coils for transformer or inductances H01F27/28)} · CPC title

• H01F37/00

  Fixed inductances not covered by group H01F17/00 · CPC title

• H01F27/08

  Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02) · CPC title