# US 2014/0360242 A1 · Rotor end band

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- Number: US 2014/0360242 A1
- Document ID: US20140360242A1
- Status: Published application
- Kind: A1
- Application number: 14/466,502
- Filed: 2014-08-22
- Published: 2014-12-11
- Earliest claimed: 2012-02-28
- Assignees: Hamilton Sundstrand Corporation
- Applicants: Hamilton Sundstrand Corporation
- Inventors: Kavithas Ponnampalam; Jong-Yeong Yung; William Louis Wentland; Craig R. Legros; Kevin L. Dickerson; Davis S. Behling
- Web page: https://patentgrep.com/patent/US20140360242A1

## CPC

- H02K 15/02: of stator or rotor bodies
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 3/30: Windings characterised by the insulating material
- H02K 3/38: around winding heads, equalising connectors, or connections thereto
- H02K 15/105: {to the windings}
- B21D 26/021: Deforming sheet bodies
- B21D 53/16: rings, e.g. barrel hoops
- C22F 1/10: of nickel or cobalt or alloys based thereon
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## Abstract

An end band and method of forming an end band for a rotor. The end band includes a hollow cylindrical band, wherein at least a portion of the band has a grain flow in a direction parallel to the hoop stress of the band. The end band also includes at least a portion having a grain flow in a direction perpendicular to the hoop stress of the band.

## Claims

### Claim 1

A method for manufacturing an end band comprising:
hydroforming a hollow cylinder having an open end and a closed end;
stress-relieving the hollow cylinder;
aging the hollow cylinder; and
removing the closed end of the hollow cylinder to form an end band.

### Claim 2 (depends on 1)

The method for manufacturing an end band according to claim 1, wherein a flat sheet of material is used to hydroform the hollow cylinder.

### Claim 3 (depends on 2)

The method for manufacturing an end band according to claim 2, wherein the material is Inconel.

### Claim 4 (depends on 1)

The method for manufacturing an end band according to claim 1, wherein a height of the hollow cylinder is substantially the same as a width of the end band.

### Claim 5 (depends on 1)

The method for manufacturing an end band according to claim 1, wherein a height of the hollow cylinder is substantially the same as a width of a plurality of end bands.

### Claim 6 (depends on 1)

The method for manufacturing an end band according to claim 1, wherein the closed end of the hollow cylinder is removed by machining.

### Claim 7 (depends on 1)

The method for manufacturing an end band according to claim 1, wherein the hollow cylinder is aged to reduce internal stresses in the band.

### Claim 8 (depends on 1)

The method for manufacturing an end band according to claim 1, wherein the hollow cylinder is stress-relieved to control the growth of the grain size.

### Claim 9 (depends on 1)

The method for manufacturing an end band according to claim 1, wherein at least one portion of the end band has a first grain flow in a direction parallel to a hoop stress of the end band and at least one portion of the end band has a second grain flow in a direction perpendicular to the hoop stress of the end band.