Adhesive bonding structure in stacked core and rotating electrical machine

A stacked core comprising:

• a plurality of stacked electrical steel sheets;
• and
• a plurality of adhesion layers disposed between the electrical steel sheets adjacent to each other in a stacking direction, wherein
• the electrical steel sheet includes an annular body,
• at least one adhesion layer of the plurality of adhesion layers is a first adhesion layer,
• in one electrical steel sheet of the two electrical steel sheets sandwiching the first adhesion layer in the stacking direction, when an imaginary axis intersecting with a central axis of the annular body and extending in an easy-magnetization direction is defined as an L-axis, an imaginary axis intersecting with the central axis and intersecting with the L-axis is defined as a C-axis, and the electrical steel sheet is partitioned into a plurality of sections in a circumferential direction of the annular body by the L-axis and the C-axis,
• at least one section of the plurality of sections is a first section,
• in the first section, an area of the first adhesion layer in a first portion of the electrical steel sheet where a main magnetic flux is generated in the L-axis direction is smaller than an area of the first adhesion layer in a second portion of the electrical steel sheet where a main magnetic flux is generated in the C-axis direction, and
• the area of the first adhesion layer is greater than 0,
• wherein
• in the first section, when a region relatively close to the C-axis is referred to as a C-axis side region and a region relatively close to the L-axis is referred to as an L-axis side region,
• the first portion includes a portion located in the C-axis side region of the annular body, and
• the second portion includes a portion located in the L-axis side region of the annular body,
• wherein
• the electrical steel sheet further includes a plurality of teeth protruding from the annular body inward in a radial direction of the annular body and disposed at intervals in a circumferential direction of the annular body,
• the first portion includes a portion of the teeth located in the L-axis side region, and
• the second portion includes a portion of the teeth located in the C-axis side region, and
• wherein
• the first adhesion layer includes a second adhesive portion disposed on a peripheral edge of the teeth, and
• in the first section, an area of the second adhesive portion in the C-axis side region is larger than an area of the second adhesive portion in the L-axis side region.

A stacked core comprising:

• a plurality of stacked electrical steel sheets;
• and
• a plurality of adhesion layers disposed between the electrical steel sheets adjacent to each other in a stacking direction, wherein
• the electrical steel sheet includes an annular body,
• at least one adhesion layer of the plurality of adhesion layers is a first adhesion layer,
• in one electrical steel sheet of the two electrical steel sheets sandwiching the first adhesion layer in the stacking direction, when an imaginary axis intersecting with a central axis of the annular body and extending in an easy-magnetization direction is defined as an L-axis, an imaginary axis intersecting with the central axis and intersecting with the L-axis is defined as a C-axis, and the electrical steel sheet is partitioned into a plurality of sections in a circumferential direction of the annular body by the L-axis and the C-axis,
• at least one section of the plurality of sections is a first section,
• in the first section, an area of the first adhesion layer in a first portion of the electrical steel sheet where a main magnetic flux is generated in the L-axis direction is smaller than an area of the first adhesion layer in a second portion of the electrical steel sheet where a main magnetic flux is generated in the C-axis direction, and
• the area of the first adhesion layer is greater than 0,
• wherein
• in the first section, when a region relatively close to the C-axis is referred to as a C-axis side region and a region relatively close to the L-axis is referred to as an L-axis side region,
• the first portion includes a portion located in the C-axis side region of the annular body, and
• the second portion includes a portion located in the L-axis side region of the annular body,
• wherein
• the first adhesion layer includes a belt-shaped adhesive portion,
• in the L-axis side region, a total area of the belt-shaped adhesive portions in which the circumferential direction is a longitudinal direction is larger than a total area of the belt-shaped adhesive portions in which a radial direction of the annular body is a longitudinal direction, and
• in the C-axis side region, the total area of the belt-shaped adhesive portions in which the circumferential direction is a longitudinal direction is smaller than the total area of the belt-shaped adhesive portions in which the radial direction is a longitudinal direction.

A stacked core comprising:

• a plurality of stacked electrical steel sheets;
• and
• a plurality of adhesion layers disposed between the electrical steel sheets adjacent to each other in a stacking direction, wherein
• the electrical steel sheet includes an annular body,
• at least one adhesion layer of the plurality of adhesion layers is a first adhesion layer,
• in one electrical steel sheet of the two electrical steel sheets sandwiching the first adhesion layer in the stacking direction, when an imaginary axis intersecting with a central axis of the annular body and extending in an easy-magnetization direction is defined as an L-axis, an imaginary axis intersecting with the central axis and intersecting with the L-axis is defined as a C-axis, and the electrical steel sheet is partitioned into a plurality of sections in a circumferential direction of the annular body by the L-axis and the C-axis,
• at least one section of the plurality of sections is a first section,
• in the first section, an area of the first adhesion layer in a first portion of the electrical steel sheet where a main magnetic flux is generated in the L-axis direction is smaller than an area of the first adhesion layer in a second portion of the electrical steel sheet where a main magnetic flux is generated in the C-axis direction, and
• the area of the first adhesion layer is greater than 0,
• wherein
• the only one easy-magnetization direction exists in the one electrical steel sheet, and
• the L-axis and the C-axis are orthogonal to each other.