LOW INERTIA ROTOR FOR DYNAMO ELECTRIC MACHINES, AND METHOD OF MAKING THE SAME

• US 3,805,104 A
• Filed: 07/27/1972
• Issued: 04/16/1974
• Est. Priority Date: 07/10/1969
• Status: Expired due to Term

• Current Assignee: Gerard Lacroux, Pierre Margrain
• Original Assignee: Gerard Lacroux, Pierre Margrain
• Inventors: Margrain, Pierre, Lacroux, Gerard
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/275,565
• Time in Patent Office: 628 Days
• Field of Search: 310/266,261,202-207,264,67,42,43,171,45,265,49A,DIG.6
• US Class Current: 310/266
• CPC Class Codes: H02K 3/26 consisting of printed conductors

Abstract

A hollow insulating cylinder with conductors thereon is placed over an internal metallic tubular support which is supported by an end disk at one end, and open at the other, the open end being flared for stiffness.

Claims

1. Low inertia rotor structure for dynamo electric machines having discrete conductors forming at least one winding loop thereon comprising a thin, hollow support cylinder made of metal (11, 19), said metal support cylinder being open at one end and having an outwardly flaring end section (25) at said open end;

a metal end support disk (20), secured to and supporting the thin metal cylinder at the other end thereof and providing a connection to a shaft (21);

a layer of insulating material (19'"'"''"'"') in cylindrical form surrounding the outside of said metal cylinder (11,

     19); and

an array of adjacently located conductive strips forming an entire winding loop on said insulating material located on the metal cylinder.

2. Rotor according to claim 1 comprising a support sheet of insulating material rolled in cylindrical form and carrying said conductive strips secured thereto, said array comprising axially extending conductor sections interconnected by integral conductive sections extending essentially circumferentially and folded about said insulating support sheet, said insulating support sheet separating the axially extending conductor sections of any one conductor applied to the sheet from the other, superposed axially extending conductor sections of the array.

3. Rotor according to claim 2, wherein the conductor sections are applied as unitary conductive bands to one side of an insulating support sheet, said sheet having a fold line (X-X) thereon;

and the sheet of insulating material is folded hinge-like around said fold line against itself with the side free from conductors at the inside of the folD, said folded sides of said sheet being adhered together.

4. Rotor according to claim 1 wherein the insulating material comprises an insulating support sheet which is soft and has a thickness in the order of tens of microns, rolled in cylindrical form, and placed on the metal cylinder, and the conductive strips are located on the support sheet.

5. Rotor according to claim 4, wherein the insulating support sheet is a polyester.

6. Rotor according to claim 2, wherein the conductive strips are metal bands;

removable sections (KLM) are provided between said strips, said strips being folded toward each other in the region of said circumferential sections;

said support sheet being a hollow cylinder of insulating material, and said removable severing sections are removed prior to assembly of the rotor into a dynamo-electric machine.

7. Rotor according to claim 1 wherein the insulating material comprises a rolled, longitudinal sheet of insulating material with said conductive strips secured thereto and located on the support cylinder (11, 19) with the insulating material contacting the outside of the metallic support cylinder.

8. Rotor according to claim 1, wherein said thin hollow cylinder is of nickel.

9. Rotor according to claim 1 wherein said hollow metal support cylinder has a thickness of about 0.25 to 0.3 mm.

10. Rotor according to claim 2 comprising a plurality of winding layers each including integral conductive strips;

said conductive strips being folded in zig-zag form; and

cylindrical sheets of insulating material (17) separating, facing conductive strips forming portions of the winding loop to insulate said portion from each other.

11. Rotor according to claim 2, wherein said sheet material having said conductive strips thereon, when rolled into cylindrical form, has an overlapping seam;

said sheet being shaped to conform to the outline of the first and last conductor; and

the overlapping portion of the sheet forming the seam with conductors thereon being adhered together with the conductor section forming a continuous circumferential array, the first and last conductors fitting uniformly against each other, with insulating sheet material therebetween, and without break in the continuous uniformity of spacing of the axially extending conductor sections.

12. Rotor according to claim 1, wherein the hollow metal support cylinder is of about 0.25 to 0.3 mm thick nickel.