# US 2018/0026501 A1 · Manufacturing method for laminated iron core and manufacturing device for laminated iron core > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026501 A1 - Document ID: US20180026501A1 - Status: Published application - Kind: A1 - Application number: 15/556,894 - Filed: 2015-03-16 - Published: 2018-01-25 - Earliest claimed: 2015-03-16 - Assignees: Kuroda Precision Industries Ltd. - Applicants: Kuroda Precision Industries Ltd. - Inventors: Tomohiro OGIKUBO; Tatsuhiro YOSHIDA; Noriyuki HOSOKAWA - Web page: https://patentgrep.com/patent/US20180026501A1 ## CPC - H02K 15/022: with salient poles - B21D 28/06: Making more than one part out of the same blank; Scrapless working - B21D 28/10: Incompletely punching in such a manner that the parts are still coherent with the work - H02K 1/148: {Sectional cores (H02K1/141 takes precedence)} - 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) ## Abstract A method of manufacturing a divided laminated iron core, wherein the iron core laminae includes first iron core laminae and second iron core laminae, includes: a first connecting-portion punching step of punching each of connecting portions between divided iron core pieces constituting each first iron core lamina in a sheet steel strip; a second connecting-portion punching step of punching each of connecting portions between divided iron core pieces constituting each second iron core lamina; and a stacking step of stacking at least one of the first iron core laminae and at least one of the second iron core laminae and joining together the stacked iron core laminae, wherein the connecting portions between the divided iron core pieces of each first iron core lamina are configured to be separated more easily than the connecting portions between the divided iron core pieces of each second iron core lamina. ## Claims ### Claim 1 A method for manufacturing a divided laminated iron core by punching iron core laminae from a sheet steel strip such that each iron core lamina includes a plurality of divided iron core pieces connected with each other in a circumferential direction, and stacking a plurality of the iron core laminae, wherein the iron core laminae include first iron core laminae and second iron core laminae, the method comprising: a first connecting-portion punching step of punching each of connecting portions between divided iron core pieces constituting each first iron core lamina, in the sheet steel strip; a second connecting-portion punching step of punching each of connecting portions between divided iron core pieces constituting each second iron core lamina, in the sheet steel strip; and a stacking step of stacking at least one of the first iron core laminae and at least one of the second iron core laminae and joining together the stacked iron core laminae, wherein the connecting portions between the divided iron core pieces of each first iron core lamina are configured to be separated more easily than the connecting portions between the divided iron core pieces of each second iron core lamina. ### Claim 2 (depends on 1) The manufacturing method for a divided laminated iron core according to claim 1, wherein the first connecting-portion punching step includes full punching for dividing each of the connecting portions of each first iron core lamina along a first dividing line, and the second connecting-portion punching step includes partial punching for dividing each of the connecting portions of each second iron core lamina along a second dividing line. ### Claim 3 (depends on 1) The manufacturing method for a divided laminated iron core according to claim 1, wherein the first connecting-portion punching step includes punching for dividing each of the connecting portions of each first iron core lamina along a first dividing line, and the second connecting-portion punching step includes punching for forming a slit in each of the connecting portions of each second iron core lamina. ### Claim 4 (depends on 1) The manufacturing method for a divided laminated iron core according to claim 1, wherein the first dividing line consists of a straight line. ### Claim 5 (depends on 1) The manufacturing method for a divided laminated iron core according to claim 1, wherein a punching shape of the connecting portions of the first iron core laminae obtained by the first connecting-portion punching step is different from a punching shape of the connecting portions of the second iron core laminae obtained by the second connecting-portion punching step. ### Claim 6 (depends on 1) The manufacturing method for a divided laminated iron core according to claim 1, wherein one of the second iron core laminae is disposed at an uppermost or lowermost layer of the laminated iron core. ### Claim 7 (canceled) ### Claim 8 (depends on 1) The manufacturing method for a divided laminated iron core according to claim 1, wherein the first connecting-portion punching step and the second connecting-portion punching step are performed by a same punch configured to selectively perform punching for the first connecting-portion punching step and punching for the second connecting-portion punching step. ### Claim 9 A device for manufacturing a divided laminated iron core by punching iron core laminae from a sheet steel strip such that each iron core lamina includes a plurality of divided iron core pieces connected with each other in a circumferential direction, and stacking a plurality of the iron core laminae, wherein the iron core laminae include first iron core laminae and second iron core laminae, the device comprising: a first connecting-portion punching section for punching connecting portions between divided iron core pieces constituting each first iron core lamina, in the sheet steel strip; a second connecting-portion punching section for punching connecting portions between divided iron core pieces constituting each second iron core lamina, in the sheet steel strip; and a stacking section for stacking at least one of the first iron core laminae and at least one of the second iron core laminae and joining together the stacked iron core laminae, wherein the connecting portions between the divided iron core pieces of each first iron core lamina are configured to be separated more easily than the connecting portions between the divided iron core pieces of each second iron core lamina. ### Claim 10 (depends on 3) The manufacturing method for a divided laminated iron core according to claim 3, wherein the first dividing line consists of a straight line. ### Claim 11 (depends on 2) The manufacturing method for a divided laminated iron core according to claim 2, wherein a punching shape of the connecting portions of the first iron core laminae obtained by the first connecting-portion punching step is different from a punching shape of the connecting portions of the second iron core laminae obtained by the second connecting-portion punching step. ### Claim 12 (depends on 3) The manufacturing method for a divided laminated iron core according to claim 3, wherein a punching shape of the connecting portions of the first iron core laminae obtained by the first connecting-portion punching step is different from a punching shape of the connecting portions of the second iron core laminae obtained by the second connecting-portion punching step. ### Claim 13 (depends on 4) The manufacturing method for a divided laminated iron core according to claim 4, wherein a punching shape of the connecting portions of the first iron core laminae obtained by the first connecting-portion punching step is different from a punching shape of the connecting portions of the second iron core laminae obtained by the second connecting-portion punching step. ### Claim 14 (depends on 10) The manufacturing method for a divided laminated iron core according to claim 10, wherein a punching shape of the connecting portions of the first iron core laminae obtained by the first connecting-portion punching step is different from a punching shape of the connecting portions of the second iron core laminae obtained by the second connecting-portion punching step. ### Claim 15 (depends on 2) The manufacturing method for a divided laminated iron core according to claim 2, wherein one of the second iron core laminae is disposed at an uppermost or lowermost layer of the laminated iron core. ### Claim 16 (depends on 3) The manufacturing method for a divided laminated iron core according to claim 3, wherein one of the second iron core laminae is disposed at an uppermost or lowermost layer of the laminated iron core. ### Claim 17 (depends on 4) The manufacturing method for a divided laminated iron core according to claim 4, wherein one of the second iron core laminae is disposed at an uppermost or lowermost layer of the laminated iron core. ### Claim 18 (depends on 10) The manufacturing method for a divided laminated iron core according to claim 10, wherein one of the second iron core laminae is disposed at an uppermost or lowermost layer of the laminated iron core. ### Claim 19 (depends on 5) The manufacturing method for a divided laminated iron core according to claim 5, wherein one of the second iron core laminae is disposed at an uppermost or lowermost layer of the laminated iron core. ### Claim 20 (depends on 2) The manufacturing method for a divided laminated iron core according to claim 2, wherein the first connecting-portion punching step and the second connecting-portion punching step are performed by a same punch configured to selectively perform punching for the first connecting-portion punching step and punching for the second connecting-portion punching step.