Method for manufacturing motor core

Patent metadata

Field	Value
Publication number	US-2025211075-A1
Application number	US-202418982117-A
Country	US
Kind code	A1
Filing date	Dec 16, 2024
Priority date	Dec 21, 2023
Publication date	Jun 26, 2025
Grant date	—

Abstract

A method for manufacturing a motor core includes forming multiple blocks, stacking the blocks to form a stacked body, and detecting an identifying portion with a detection device. The forming the blocks includes forming, only in the iron core piece that forms one end face of each block, an identifying portion for identifying the progressive press device that forms that block. The forming, only in the iron core piece that forms one end face of each block, the identifying portion includes forming the identifying portion in a surface of the iron core piece that forms the one end face of the block. The stacking the blocks to form the stacked body includes stacking, to form the stacked body, only the blocks formed by the progressive press device corresponding to the detected identifying portion among the multiple blocks.

First claim

What is claimed is:

1 . A method for manufacturing a motor core, comprising:
forming multiple blocks, including:
punching iron core pieces from a thin plate-shaped workpiece with multiple progressive press devices;
forming, only in an iron core piece that forms one end face of each block, an identifying portion for identifying the progressive press device that forms that block; and
forming a block by stacking the punched iron core pieces in each progressive press device;
stacking the blocks to form a stacked body; and detecting the identifying portion with a detection device prior to the stacking the blocks to form the stacked body, wherein the forming, only in the iron core piece that forms one end face of each block, the identifying portion includes forming the identifying portion in a surface of the iron core piece that forms the one end face of the block, and the stacking the blocks to form the stacked body includes stacking, to form the stacked body, only the blocks formed by the progressive press device corresponding to the detected identifying portion among the multiple blocks.

2 . The method for manufacturing a motor core according to claim 1 , wherein the progressive press devices are arranged in parallel and simultaneously punch the iron core pieces from a same workpiece.

3 . The method for manufacturing a motor core according to claim 2 , wherein
the progressive press devices include two progressive press devices arranged in parallel, the identifying portion for identifying one of the two progressive press devices, which are arranged in parallel, is a through-hole formed in the iron core piece by the one of the progressive press devices, and the identifying portion for identifying the other of the two progressive press devices, which are arranged in parallel, is a section in the iron core piece that corresponds to the through-hole but lacks the through-hole.

4 . The method for manufacturing a motor core according to claim 3 , wherein
the through-hole is one of multiple through-holes, and the forming the identifying portions includes forming the through-holes in the iron core piece at positions that are rotationally symmetric with respect to an axis of the block.

5 . The method for manufacturing a motor core according to claim 3 , wherein the forming, only in the iron core piece that forms one end face of each block, the identifying portion includes forming only one through-hole in the iron core piece.

6 . The method for manufacturing a motor core according to claim 2 , wherein
the identifying portion is a through-hole formed in each of all the blocks formed by the progressive press devices, and at least one of a shape and a size of the identifying portion is different in each of the progressive press devices, which form the blocks.

7 . The method for manufacturing a motor core according to claim 1 , wherein the detecting the identifying portion includes capturing an image of the one end face of the block and detecting the identifying portion based on the captured image.

Assignees

• Toyota Boshoku Kk

Inventors

• Homma Daisuke
• Sakurai Yasunori
• Oda Harutaka

Classifications

• H02K15/021

  Magnetic cores · CPC title

• H02K15/02

  of stator or rotor bodies · CPC title

• H02K15/40

  Assembling dynamo-electric machines (H02K15/16 takes precedence) · CPC title

• H02K2215/00

  Specific aspects not provided for in other groups of this subclass relating to methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines · CPC title

• H02K15/027 Primary

  Punching the cores · CPC title