Dynamoelectric stator core and method for manufacture thereof

Abstract

A core assembly is manufactured by punching core segments at a predetermined pitch in a short-side direction thereof with long sides aligned in a width direction of a rolled steel plate, the long sides of the core segments having lengths that are half a length of a long side of the core assembly; preparing four (two first and two second) laminated core sections by aligning punching directions of the core segments and laminating the core segments to a thickness that is half a laminated thickness of the core assembly; preparing two core subassemblies by inverting the second laminated core sections and laminating them onto the first laminated core sections such that the punching directions of the core segments are in opposite directions; and preparing the core assembly by arranging the two core subassemblies in a longitudinal direction and integrating them by joining.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective of a dynamoelectric stator that was prepared using a stator core according to Embodiment 1 of the present invention;

FIG. 2 is a diagram that explains a press-punching process in a method for manufacturing a stator core according to Embodiment 1 of the present invention;

FIG. 3 is a top plan of a core segment that was punched from a rolled steel plate;

FIGS. 4A through 4D are diagrams that explain a process for preparing a core assembly in the method for manufacturing a stator core according to Embodiment 1 of the present invention;

FIG. 5 is an exploded perspective of a core assembly that was prepared using the method for manufacturing a stator core according to Embodiment 1 of the present invention;

FIG. 6 is a perspective of the core assembly that was prepared using the method for manufacturing a stator core according to Embodiment 1 of the present invention;

FIGS. 7A through 7C are diagrams that explain a process for bending the core assembly in the method for manufacturing a stator core according to Embodiment 1 of the present invention;

FIG. 8 is a diagram that explains a press-punching process in a method for manufacturing a stator core according to Embodiment 2 of the present invention;

FIG. 9 is a perspective of a dynamoelectric stator that was prepared using a stator core according to Embodiment 3 of the present invention;

FIG. 10 is an exploded perspective of a core assembly that was prepared using a method for manufacturing a stator core according to Embodiment 3 of the present invention; and

FIG. 11 is a perspective of the core assembly that was prepared using the method for manufacturing a stator core according to Embodiment 3 of the present invention.

Claims

1. A method for manufacturing a dynamoelectric stator core that is prepared by bending into a cylindrical shape a rectangular parallelepiped core assembly that is formed by laminating rectangular core segments that have been punched from a rolled steel plate, abutting two end surfaces of said core assembly that has been bent into a cylindrical shape, and joining said abutted portion together, said method for manufacturing a dynamoelectric stator core comprising steps of:punching said core segments at a predetermined pitch in a short-side direction thereof with long sides aligned in a width direction of said rolled steel plate, said long sides of said core segments having lengths that divide a length of a long side of said core assembly into m sections (where m is an integer that is greater than or equal to 2);preparing 2n laminated core sections (where n is an integer that is greater than or equal to 1) for each of said m sections by aligning punching directions of said core segments and laminating said core segments to a thickness that divides a laminated thickness of said core assembly into 2n equal sections;preparing n sets of core subassemblies for each of said m sections by inverting a first of said laminated core sections and laminating said first laminated core section onto a second of said laminated core sections such that said punching directions of said core segments are in opposite directions; andpreparing said core assembly by laminating said n sets of core subassemblies in each of said m sections, and arranging said m sections in a longitudinal direction and integrating said m sections by joining.

2. A method for manufacturing a dynamoelectric stator core according to claim 1, wherein said core segments are punched to a length that divides said length of said long side of said core assembly into m equal sections.

3. A dynamoelectric stator core that is prepared by bending into a cylindrical shape a rectangular parallelepiped core assembly that is formed by laminating rectangular core segments that have been punched from a rolled steel plate, abutting two end surfaces of said core assembly that has been bent, and joining said abutted portion together, said dynamoelectric stator core comprising:said stator core is configured by integrating (m×n) core sections that have shapes that divide a circumferential length of said stator core into m sections (where m is an integer that is greater than or equal to 2) and divide an axial thickness into n equal sections (where n is an integer that is greater than or equal to 1); andeach of said core sections is configured by laminating a first core section and a second core section that are each formed by aligning punching directions of said core segments and laminating said core segments to a thickness that divides said axial thickness into two equal sections, said first core section and said second core section being laminated such that said punching directions of said core segments are in opposite directions.