# US 4,398,112 A · Aminated winding for electric machines

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- Number: US 4,398,112 A
- Document ID: US4398112A
- Status: Granted
- Kind: A
- Application number: 06/217,218
- Filed: 1980-12-17
- Granted: 1983-08-09
- Earliest claimed: 1976-07-12
- Inventors: Adrianus W. van Gils
- Web page: https://patentgrep.com/patent/US4398112A

## CPC

- H01F 27/2847: {Sheets; Strips (H01F27/2866 takes precedence)}
- H01F 27/24: Magnetic cores
- H01F 27/306: {Fastening or mounting coils or windings on core, casing or other support}
- H01F 30/10: Single-phase transformers (H01F30/16 takes precedence)
- H02K 3/04: Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H01F 2027/2861: {Coil formed by folding a blank}
- 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 laminated winding for electric machines comprises a cylinder formed of a roll of conductive strip-like material isolate on one side and having a roll wall. The cylinder includes axial slots across the roll wall alternatively starting from the one roll end and from the other roll end and extending nearly up to the opposite roll end leaving a circumferential portion and so as to form a wave winding. The laminated winding further comprises electrical terminals for supplying an electrical current through the wave winding. Preferably, the axial roll portion between the slots and the circumferential roll portions are of equal width. A first one of the windings may be arranged as a rotor and a second one of the windings may be arranged as a stator of a rotating electric machine.

## Claims

### Claim 1

A plurality of laminated windings for an electric machine, each of said laminated windings comprising a cylindrically formed roll of conductive strip-like material isolate on one side and having a cylindrical surface concentric about a cylindrical axis, said cylindrically formed roll having axial slots formed in the cylindrical surface alternatively starting from one roll end and from another roll end, respectively, and extending nearly up to the respective opposite roll end, leaving a circumferential roll portion and forming a laminated winding with three quarter windings, said laminated winding further comprising electrical terminal means connected to said laminated winding with three quarter windings for supplying an electrical current therethrough, said electric machine comprising a rotating electric machine, a first one of said laminated windings being arranged as a rotor, and a second one of said laminated windings being arranged as a stator.

### Claim 2 (depends on 1)

A plurality of laminated windings as recited in claim 1, wherein portions of said cylindrical surface of said cylindrically formed roll located between said axial slots comprise axial roll portions, said axial roll portions and said circumferential roll portions being of equal width.

### Claim 3 (depends on 1)

A plurality of laminated windings as recited in claim 1, wherein the total length of the conductive strip-like material follows from: ##EQU3## where: ##EQU4## diameter of the laminated winding z=number of coil sides
N=number of layers
l.sub.G =length of effective sides measured from centre to centre of the width of the conductive strip-like material.

### Claim 4 (depends on 1)

A plurality of laminated windings as recited in claim 1, wherein a multiple of said rolls of conductive material having an increasing diameter are disposed slidably, one inside the other, each said roll of conductive material having an effective side in which currents flow in the same direction.

### Claim 5 (depends on 1)

A plurality of laminated windings as recited in claim 1, further comprising a shaft and a cylindrical winding positioned between said shaft and said cylindrically formed roll of conductive strip-like material.