Laminated core and electric motor
A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part provided between electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other, wherein the adhesion part partially adheres the electrical steel sheets adjacent to each other in the stacking direction, and the adhesion parts adjacent to each other in the stacking direction have different arrangement regions in a plan view seen in the stacking direction.
1. A laminated core comprising:
a plurality of electrical steel sheets stacked on each other; and
an adhesion part provided between the electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other,
wherein the adhesion part partially adheres the electrical steel sheets adjacent to each other in the stacking direction,
wherein the adhesion parts adjacent to each other in the stacking direction have different arrangement regions in a plan view seen in the stacking direction, and
wherein in the adhesion parts, the arrangement regions overlap each other at an N-layer interval (N is a prime number) in a plan view seen in the stacking direction.
2. The laminated core according to claim 1 , wherein:
the electrical steel sheet includes an annular core back part, and a plurality of tooth parts which protrude from the core back part in a radial direction and are disposed at an interval in a circumferential direction of the core back part; and
the adhesion parts are provided on at least one of a stacking surface of the core back part and a stacking surface of the tooth part.
3. The laminated core according to claim 1 , wherein;
a stacking surface of the electrical steel sheet located at one end in the stacking direction among the plurality of electrical steel sheets is entirely adhered to a stacking surface of the electrical steel sheet adjacent to each other in the stacking direction; and
a stacking surface of the electrical steel sheet located at the other end in the stacking direction among the plurality of electrical steel sheets is entirely adhered to a stacking surface of the electrical steel sheet adjacent to each other in the stacking direction.
4. The laminated core according to claim 1 , wherein an average thickness of the adhesion part is 1.0 μm to 3.0 μmm.
5. The laminated core according to claim 1 , wherein an average tensile modulus of elasticity E of the adhesion part is 1500 MPa to 4500 MPa.
6. The laminated core according to claim 1 , wherein the adhesion part is a room temperature adhesion type acrylic-based adhesive containing SGA made of an elastomer-containing acrylic-based adhesive.
7. An electric motor including the laminated core according to claim 1 .