# US 10,483,033 B2 · Electromagnetic device

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- Number: US 10,483,033 B2
- Document ID: US10483033B2
- Status: Granted
- Kind: B2
- Application number: 15/841,842
- Filed: 2017-12-14
- Published: 2018-06-28
- Granted: 2019-11-19
- Earliest claimed: 2016-12-22
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Masatomo Shirouzu; Kenichi Tsukada
- Web page: https://patentgrep.com/patent/US10483033B2

## CPC

- H01F 30/04: having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies
- H01F 27/24: Magnetic cores
- H01F 27/263: {Fastening parts of the core together}
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 27/40: Structural association with built-in electric component, e.g. fuse
- H01F 27/408: {Association with diode or rectifier}
- H01F 30/12: Two-phase, three-phase or polyphase transformers
- H01F 37/00: Fixed inductances not covered by group H01F17/00
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

An electromagnetic device includes an outer peripheral iron core, and at least three iron core coils which are in contact with or coupled to the inner surface of the outer peripheral iron core. The at least three iron core coils each include an iron core, and at least one of a primary coil and a secondary coil, which are wound around the iron core. The at least three iron core coils are arranged in a circle, and the iron core of one of the at least three iron core coils is in contact with the iron cores of the other iron core coils adjacent to the one iron core coil.

## Claims

### Claim 1

An electromagnetic device comprising:
an outer peripheral iron core; and
at least three iron core coils which are in contact with or coupled to the inner surface of the outer peripheral iron core, wherein
the at least three iron core coils each include an iron core respectively having tip side iron core portions and base end side iron core portions, which are located at the outer peripheral iron core side, and at least one of a primary coil and a secondary coil, which are wound around the base end side iron core portions,
the at least three iron core coils are arranged on a circumference of a circle, and the tip side iron core portion of the iron core of one iron core coil of the at least three iron core coils is in contact with the tip side iron core portions of the iron cores of the other iron core coils adjacent to the one iron core coil;
each of radially inside ends of the tip side iron core portions converge on a center of the outer peripheral iron core; and
the tip side iron core portions and the base end side iron core portions are in contact with each other in a radial direction of the outer peripheral iron core.

### Claim 2 (depends on 1)

The electromagnetic device according to claim 1, wherein at least two or all of the tip side iron core portions of the iron cores of the at least three iron core coils are connected to one another.

### Claim 3 (depends on 1)

The electromagnetic device according to claim 1, wherein the outer peripheral iron core is comprised of a plurality of outer peripheral iron core portions (21 to 26).

### Claim 4 (depends on 1)

The electromagnetic device according to claim 1, further comprising a barrier part attached to an end face of the outer peripheral iron core;
the barrier part has a shape corresponding to a shape of the outer peripheral iron core, and has an opening;
the barrier part has a thickness, which is larger than protruding portions for which the at least one of the primary coil and the secondary coil protrudes from the end face of the outer peripheral iron core to the outside.

### Claim 5 (depends on 4)

The electromagnetic device according to claim 4, further comprising a cover part for at least partially covering the opening.

### Claim 6 (depends on 1)

The electromagnetic device according to claim 1, wherein the number of the at least three iron core coils is a multiple of 3.

### Claim 7 (depends on 1)

The electromagnetic device according to claim 1, wherein the number of the at least three iron core coils is an even number not less than 4.

### Claim 8 (depends on 1)

The electromagnetic device according to claim 1, wherein three of the sides of the cross-sectional surface of the primary coil or the secondary coil, which is perpendicular to the axial cross-sectional surface of the outer peripheral iron core, are at least partially adjacent to the corresponding iron core.

### Claim 9 (depends on 1)

The electromagnetic device according to claim 1, wherein the electromagnetic device is a transformer.

### Claim 10 (depends on 1)

The electromagnetic device according to claim 1, wherein the electromagnetic device is a reactor.

### Claim 11 (depends on 1)

A motor driving device to which the electromagnetic device according to claim 1 is applied.

### Claim 12 (depends on 11)

A machine to which the motor driving device according to claim 11 is applied.

### Claim 13 (depends on 1)

A rectifier device to which the electromagnetic device according to claim 1 is applied.