Method for Manufacturing Laminated Rotor Core

• US 20080201936A1
• Filed: 02/27/2008
• Published: 08/28/2008
• Est. Priority Date: 02/28/2007
• Status: Active Grant

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: Suzuki, Haruji, Hoshino, Akinori, Kamio, Shusaku
• Granted Patent: US 8,234,775 B2
• Time in Patent Office: Days
• US Class Current: 29/598
• CPC Class Codes: H02K 15/03 having permanent magnets
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49012 Rotor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49078 Laminated

Abstract

A method for manufacturing a laminated rotor core includes a punching process for punching a strip-shaped material to make a core piece, a placing process, which is performed simultaneously with the punching process of the core piece, for placing the core piece in a die so that the core piece is placed on another core piece previously punched and placed in the die and a joining process for joining the core pieces.

Claims

1. A method for manufacturing a laminated rotor core, comprising:

a punching process for punching a strip-shaped material to make a core piece;

a placing process, which is performed simultaneously with the punching process of the core piece, for placing the core piece in a die so that the core piece is placed on another core piece previously punched and placed in the die; and

a joining process for joining the core pieces.

2. The method for manufacturing the laminated rotor core according to claim 1, wherein the placed core pieces are joined in the die in the joining process.

3. The method for manufacturing the laminated rotor core according to claim 2, wherein in the joining process, an embossed portion, which is made by half die cutting and which is provided on a surface of the core piece, is riveted with another embossed portion, which is made by half die cutting and which is provided on a surface of the other core piece adjacent to the core piece in a laminating direction.

4. The method for manufacturing the laminated rotor core according to claim 1, wherein two or more strips of the strip-shaped material are punched to make two or more core pieces in the punching process.

5. The method for manufacturing the laminated rotor core according to claim 1, wherein the strip-shaped material is a grain-oriented electrical steel sheet and the grain-oriented electrical steel sheet is punched so that an easy magnetization direction of the grain-oriented electrical steel sheet corresponds to a predetermined direction.

6. The method for manufacturing the laminated rotor core according to claim 1, wherein the core piece made by the punching process is placed in the die in the placing process so that the core pieces are placed in a circumferential direction.

7. The method for manufacturing the laminated rotor core according to claim 6, wherein the core piece is placed in the placing process so that the core pieces are placed in the circumferential direction by rotating the die.

8. The method for manufacturing the laminated rotor core according to claim 1, wherein the core pieces adjacent each other in a laminating direction are displaced from each other in a circumferential direction.

9. The method for manufacturing the laminated rotor core according to claim 1, wherein the punching process and the placing process are performed with use of the die having a ring-shaped die hole.