# US 2017/0284556 A1 · Electromagnetic actuator structure

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- Number: US 2017/0284556 A1
- Document ID: US20170284556A1
- Status: Published application
- Kind: A1
- Application number: 15/127,015
- Filed: 2015-03-19
- Published: 2017-10-05
- Earliest claimed: 2014-03-20
- Assignees: GM Global Technology Operations LLC
- Applicants: GM Global Technology Operations LLC
- Inventors: AVOKI M. OMEKANDA; THOMAS W. NEHL; CHANDRA S. NAMUDURI; SURESH GOPALAKRISHNAN
- Web page: https://patentgrep.com/patent/US20170284556A1

## CPC

- F16K 31/0675: {Electromagnet aspects, e.g. electric supply therefor}
- H01F 7/081: {Magnetic constructions}
- H01F 7/1607: {Armatures entering the winding}
- H01F 27/24: Magnetic cores
- H01F 2007/086: {Structural details of the armature}
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A core structure for an electromagnetic actuator includes an electrically conductive magnetic core component having a magnetic axis, an outer surface between axially opposite ends and at least one slit arranged between said axially opposite ends through the outer surface.

## Claims

### Claim 1

A core structure for an electromagnetic actuator, comprising:
an electrically conductive magnetic core component having a magnetic axis, an outer surface between axially opposite ends and at least one slit arranged between said axially opposite ends through the outer surface.

### Claim 2 (depends on 1)

The core structure of claim 1, wherein said electrically conductive magnetic core component is annular and further comprises an inner surface.

### Claim 3 (depends on 2)

The core structure of claim 2 wherein said at least one slit comprises a slot.

### Claim 4 (depends on 2)

The core structure of claim 2 wherein said at least one slit comprises one slot and a plurality of slits.

### Claim 6 (depends on 2)

The core structure of claim 2, further comprising at least one slit arranged between said axially opposite ends through the inner surface.

### Claim 7 (depends on 1)

The core structure of claim 1 wherein said at least one slit is arranged parallel to said magnetic axis.

### Claim 8 (depends on 1)

The core structure of claim 1 wherein said at least one slit is arranged helically to said magnetic axis.

### Claim 9

A core structure for an electromagnetic actuator, comprising:
an annular electrically conductive magnetic core component having a magnetic axis, and inner and an outer surfaces between axially opposite ends, and at least one slit arranged between said axially opposite ends through at least one of the inner and outer surfaces.

### Claim 10 (depends on 9)

The core structure of claim 9 wherein said at least one slit comprises a slot.

### Claim 11 (depends on 9)

The core structure of claim 9 wherein said at least one slit comprises one slot and a plurality of slits.

### Claim 12 (depends on 9)

The core structure of claim 9 wherein said at least one slit comprises a plurality of slits arranged only on the outer surface of the core.

### Claim 13 (depends on 9)

The core structure of claim 9 wherein said at least one slit comprises a plurality of slits arranged only on the inner surface of the core.

### Claim 14 (depends on 9)

The core structure of claim 9 wherein said at least one slit comprises a plurality of slits arranged on both the inner and outer surfaces of the core.

### Claim 15 (depends on 9)

The core structure of claim 9 wherein said at least one slit is arranged parallel to said magnetic axis.

### Claim 16 (depends on 9)

The core structure of claim 9 wherein said at least one slit is arranged helically to said magnetic axis.

### Claim 17

An electromagnetic fuel injector, comprising:
an annular electrically conductive magnetic core component having a magnetic axis, and inner and an outer surfaces between axially opposite ends, and at least one slit arranged between said axially opposite ends through at least one of the inner and outer surfaces.

### Claim 18 (depends on 17)

The electromagnetic fuel injector of claim 17 wherein said annular electrically conductive magnetic core component comprises at least one of a guide ring, an armature, a pintle, and a magnetic core.

### Claim 19 (depends on 17)

The core structure of claim 17 wherein said at least one slit comprises a slot.

### Claim 20 (depends on 17)

The core structure of claim 17 wherein said at least one slit comprises one slot and a plurality of slits.