Stator core of electric motor, stator, electric motor, and method for manufacturing stator core

A stator core of an electric motor, the stator core comprising:

• a plurality of core plates stacked in an axial direction of the stator core, each core plate having an outer shape of polygon, and including a refrigerant hole of a closed area which defines a channel through which the refrigerant flows,
• wherein the plurality of core plates include:
• a first core plate;
• and
• a second core plate stacked on the first core plate, and having a shape obtained by inverting the first core plate around a symmetry axis of the polygon or rotating the first core plate around a central axis of the first core plate by a center angle of the polygon;
• and
• wherein the refrigerant hole of the first core plate extends in a circumferential direction of the stator core, and a part of the refrigerant hole of the first core plate fluidly communicates with the refrigerant hole of the second core plate in the axial direction.