US 2025/0025928 A1 · METHOD FOR MANUFACTURING LAMELLAS FOR A LAMINATION

Abstract

The present invention relates to a method for manufacturing lamellas (20) from sheet metal (30) for a stack of such lamellas (20), i.e. a lamination, such as the core of a transformer or of a rotor or a stator of an electric machine. According to the present invention, in a first manufacturing step (A), the individual lamellas (20) are only partly cut loose from the sheet material (30), while connecting tabs (32) are left between the lamellas (20) and a remaining frame part (31) of the sheet material (30). As a result, the lamellas (20) can be subsequently processed (SP) separately, favorably without requiring the individual and/or direct handling thereof. Only thereafter, in second manufacturing step according to the present invention (B), the lamellas (20) are completely cut loose from the frame part (31) of the sheet material (30) by cutting the said connecting tabs (32) there between.

Claims19

Dependent claims

A method for manufacturing lamellas (1;

10;
20;
50) from sheet material (30) for a lamination stack thereof, such as a transformer core or a stator or rotor laminate of an electric motor, wherein the lamellas (1;
10;
20;
50) are partially cut loose from the sheet material (30) in a first process step (A) and wherein the lamellas (1;
10;
20;
50) are completely cut loose from the sheet material (30) in a second process step (B).

6 more elements

A method for manufacturing pairs of lamellas (10, 20;

50) from sheet material (30), the pair of lamellas (10;
20;
50) comprising a stator ring (10) and a rotor disc (20) that are respectively configured for a stator lamination and a rotor lamination of an electric motor, wherein, in a first process step (A), at least the stator ring (10) of a respective lamella pair (10, 20;
50) is partially cut loose from the sheet material (30) by piercing a number of elongated holes (15) along an outer contour thereof, while leaving a corresponding number of connecting bridges (32;
32-2) between the respective lamella pair (10, 20;
50) and a frame part (31) of the sheet material (30) or an adjacent lamella (1;
10;
20;
50), and wherein, in a second process step (B), the connecting bridges (32;
32-2) are severed along the outer contour of the stator ring (10).

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/717,722Filed 27 Dec 2022

Priority

NL 203037130 Dec 2021

Published

23 Jan 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

B21D 28/10
Punching blanks or articles with or without obtaining scrap ; Notching: incompletely punching in such a manner that the parts are still coherent…
B21D 28/22
Punching blanks or articles with or without obtaining scrap ; Notching: notching the peripheries of circular blanks, e.g. laminations for…
H02K 15/02
Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines: of stator or rotor…
B21D
Working or processing of sheet metal or metal tubes, rods or profiles

Method for manufacturing lamellas for a lamination

Life of this patent

Method for manufacturing lamellas for a lamination

Life of this patent

Abstract

Claims19