# US 8,786,157 B2 · Separable tooth tip armature construction

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- Number: US 8,786,157 B2
- Document ID: US8786157B2
- Status: Granted
- Kind: B2
- Application number: 13/157,516
- Filed: 2011-06-10
- Published: 2011-12-22
- Granted: 2014-07-22
- Earliest claimed: 2010-06-17
- Assignees: Kollmorgen Corporation
- Applicants: Gerald W. Brown
- Inventors: Gerald W. Brown
- Web page: https://patentgrep.com/patent/US8786157B2

## CPC

- H02K 1/148: {Sectional cores (H02K1/141 takes precedence)}
- Y10T 29/49009: Dynamoelectric machine
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In a process of producing a stator forming part of a rotary motor arrangement, a multiplicity of laminations are joined together to produce a first stack of laminations defining teeth, slots between adjacent teeth, and a yoke section connecting the teeth together. Coil elements are then mounted on the teeth so that the coil elements are disposed in the slots between the adjacent teeth, and a second stack of laminations is fitted onto an inner diameter of the first stack of laminations and fixed in place to function as tooth tips. At least part of the second lamination stack is then bored out or otherwise removed to dispose of all but a thin layer of the second stack of laminations bridging adjacent teeth defined by the first stack of laminations. A rotary motor stator produced by such a process is also described.

## Claims

### Claim 1

A process of producing a part of a rotary motor arrangement comprising:
joining a multiplicity of laminations together to produce a first stack of laminations defining teeth, slots between adjacent teeth, and a yoke section connecting the teeth together,
mounting coil elements on said teeth so that portions of the coil elements are disposed in at least some of said slots between adjacent teeth,
fitting a second stack of laminations onto an inner diameter of the first stack of laminations and fixing the second stack in place to function as tooth tips, and
removing at least a portion of the second lamination stack after fixing the second stack in place on the inner diameter of the first lamination stack so as to leave only a thin layer of the second stack of laminations bridging adjacent teeth defined by said first stack of laminations and form said part of the rotary motor arrangement.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the thin layer connects all tips of said teeth together.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the thin layer connects only some, and not all, tips of said teeth together.

### Claim 4 (depends on 1)

The process according to claim 1, wherein said part is a stator of said rotary motor arrangement.

### Claim 5 (depends on 4)

A stator produced by the process of claim 4.

### Claim 6 (depends on 1)

The process according to claim 1, wherein said portion removed from the second lamination stack is removed by boring.

### Claim 7 (depends on 1)

The process according to claim 1, wherein said portion removed from the second lamination stack is annular.

### Claim 8 (depends on 1)

The process according to claim 1, wherein said portion removed from the second lamination stack is crescent-shaped.

### Claim 9 (depends on 1)

The process according to claim 1, wherein said second lamination stack includes laminations having different shapes.

### Claim 10 (depends on 1)

The process according to claim 1, wherein all laminations in said second lamination stack have the same shape.

### Claim 11

A stator that is to form part of a rotary motor arrangement comprising:
a multiplicity of laminations joined together to produce a first stack of laminations defining teeth, slots between adjacent teeth, and a yoke section connecting the teeth together,
coil elements mounted on said teeth so that portions of the coil elements are disposed in at least some of said slots between adjacent teeth, and
a second stack of laminations fitted onto an inner diameter of the first stack of laminations and fixed in place relative to the first stack to function as tooth tips,
wherein at least a portion of the second lamination stack has been removed after fixing the second stack in place on the inner diameter of the first lamination stack to leave only a thin layer of the second stack of laminations bridging adjacent teeth defined by said first stack of laminations and form said part of the rotary motor arrangement, and
wherein the thin layer of material connects only some, and not all, tips of said teeth together.

### Claim 12 (depends on 11)

The stator according to claim 11, wherein said second lamination stack includes laminations having different shapes.