# US 10,770,218 B2 · Reactor, motor driver, power conditioner and machine

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- Number: US 10,770,218 B2
- Document ID: US10770218B2
- Status: Granted
- Kind: B2
- Application number: 15/890,502
- Filed: 2018-02-07
- Published: 2018-08-16
- Granted: 2020-09-08
- Earliest claimed: 2017-02-16
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Kenichi Tsukada; Masatomo Shirouzu
- Web page: https://patentgrep.com/patent/US10770218B2

## CPC

- H01F 27/105: {Cooling by special liquid or by liquid of particular composition}
- H01F 3/14: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12)
- H01F 27/08: Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02)
- H01F 27/10: Liquid cooling
- H01F 27/266: {Fastening or mounting the core on casing or support (on coil H01F27/30)}
- H01F 27/2852: {Construction of conductive connections, of leads}
- H01F 27/306: {Fastening or mounting coils or windings on core, casing or other support}
- H01F 30/12: Two-phase, three-phase or polyphase transformers
- H01F 30/16: Toroidal transformers
- H01F 37/00: Fixed inductances not covered by group H01F17/00
- H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence)
- H01F 27/263: {Fastening parts of the core together}
- H01F 2027/328: {Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A reactor includes an outer peripheral iron core and at least three iron-core coils that contact or are connected to an inner surface of the outer peripheral iron core. Each of the iron-core coils includes iron cores and coils wound onto the iron cores. The reactor further includes an external cooling unit disposed outside the outer peripheral iron core, to cool the outer peripheral iron core.

## Claims

### Claim 1

A reactor comprising:
an outer peripheral iron core;
at least three iron-core coils contacting or connected to an inner surface of the outer peripheral iron core,
wherein each of the iron-core coils includes iron cores and coils wound onto the iron cores, wherein a radial inner end portion of each of the iron cores converges towards a center of the outer peripheral iron core;
gaps that can magnetically connect one iron-core coil of the at least three iron-core coils and an iron-core coil adjacent to the one iron-core coil to each other are formed between the one iron-core coil of the at least three iron-core coils and the iron-core coil adjacent to the one iron-core coil, wherein the radial inner end portion of the iron core of the one iron-core coil is separated from the radial inner end portions of each adjacent iron core by the gaps;
wherein each of the iron cores extends only in a radial direction of the outer peripheral iron core; and
an external cooling unit is disposed circumferentially outside the outer peripheral iron core, for cooling the outer peripheral iron core.