# US 10,770,216 B2 · Reactor

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- Number: US 10,770,216 B2
- Document ID: US10770216B2
- Status: Granted
- Kind: B2
- Application number: 15/915,511
- Filed: 2018-03-08
- Published: 2018-09-13
- Granted: 2020-09-08
- Earliest claimed: 2017-03-13
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Kenichi Tsukada; Masatomo Shirouzu
- Web page: https://patentgrep.com/patent/US10770216B2

## CPC

- H01F 27/025: {Constructional details relating to cooling}
- H01F 3/14: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12)
- H01F 27/06: Mounting, supporting, or suspending transformers, reactors, or choke coils {not being of the signal type}
- H01F 27/085: {Cooling by ambient air}
- H01F 27/24: Magnetic cores
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 37/00: Fixed inductances not covered by group H01F17/00
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A reactor includes an outer peripheral iron core, and at least three core coils contacting or connected to an inner surface of the outer peripheral iron core. Each of the core coils includes a core and a coil wound onto the core. The reactor includes an attachment unit disposed on one end surface of the outer peripheral iron core, to attach the outer peripheral iron core in a predetermined position. At least one ventilation port is formed in an extension portion of the attachment unit.

## Claims

### Claim 1

A reactor comprising:
an outer peripheral iron core;
at least three core coils contacting or connected to an inner surface of the outer peripheral iron core;
each of the core coils including a core and a coil wound onto the core; and
an attachment unit disposed on one end surface of the outer peripheral iron core, for attaching the outer peripheral iron core in a predetermined position, the attachment unit including an end plate and a plurality of extension portions cantilevered to the end plate, each of the plurality of extension portions having a respective base abutting the end plate, the plurality of extension portions each extending in a perpendicular direction from the base to a respective distal end, each respective distal end of the plurality of extension portions abutting the end surface of the outer peripheral iron core at separate respective locations, the plurality of extension portions spaced apart from each other on the end plate to form ventilation ports between the end surface of the outer peripheral iron core and the end plate,
wherein the outer peripheral iron core has a plurality of holes extending in an axial direction, and each of the plurality of extension portions has a respective hole extending in the axial direction from each respective distal end of the plurality of extension portions, and
wherein the holes of the outer peripheral iron core and the holes of the extension portions are aligned, such that the attachment unit and the outer peripheral iron core are connected with screws extending through the holes of the outer peripheral iron core and the holes of the extension portions.

### Claim 2 (depends on 1)

The reactor according to claim 1, further comprising a central core disposed at the center of the outer peripheral iron core.

### Claim 3 (depends on 1)

The reactor according to claim 1, wherein the attachment unit includes an end plate and an extension portion extending in a perpendicular direction of the end plate, and a through hole is formed in a portion of the end plate corresponding to an axial direction of the outer peripheral iron core or the cores.

### Claim 4 (depends on 3)

The reactor according to claim 3, further comprising a cooling fan attached to the through hole.

### Claim 5 (depends on 4)

The reactor according to claim 4, wherein the cooling fan is disposed on radial inner sides of the coils of the at least three core coils.

### Claim 6 (depends on 1)

The reactor according to claim 1, wherein
the outer peripheral iron core has a hole extending in an axial direction, and
the attachment unit and the outer peripheral iron core are connected with a connection rod inserted into the hole.