A method for manufacturing a polymeric electrical machine, comprising: manufacturing a stator including a laminated stator core and a plurality of windings including winding overhangs extending from the laminated stator core; applying a surface treatment to the laminated stator core, the surface treatment being constructed to reduce defects at an interface between a polymeric material and the laminated stator core and enhance adherence between the polymeric material and the laminated stator core; mounting the stator onto a mandrel, the mandrel being constructed to have a fit with an inside of the laminated stator core sized to prevent a flow of the polymeric material between the laminated stator core and the mandrel; inserting the stator into an electrical machine housing mold; molding a polymeric electrical machine housing including a stator band with an integral non-drive end endplate using the polymeric material and the electrical machine housing mold, wherein the molding of the polymeric housing includes overmolding the stator with the winding overhangs within the stator band; inserting a metallic structure into a drive end endplate mold; molding a drive end endplate using the polymeric material and the drive end endplate mold, including forming a plurality of polymeric ribs in the drive end endplate, and including overmolding the metallic structure into the drive end endplate, the metallic structure being constructed to enhance mechanical stiffness of the drive end endplate; installing a rotor assembly into the polymeric electrical machine housing; and installing the drive end endplate onto the polymeric electrical machine housing, characterized in that the drive end endplate is molded to include a rabbet, a cavity disposed radially inward of the rabbet, and at least one drain hole that opens to the cavity and to an outer diameter of the drive end endplate to drain fluid entering the cavity. manufacturing a stator including a laminated stator core and a plurality of windings including winding overhangs extending from the laminated stator core; applying a surface treatment to the laminated stator core, the surface treatment being constructed to reduce defects at an interface between a polymeric material and the laminated stator core and enhance adherence between the polymeric material and the laminated stator core; mounting the stator onto a mandrel, the mandrel being constructed to have a fit with an inside of the laminated stator core sized to prevent a flow of the polymeric material between the laminated stator core and the mandrel; inserting the stator into an electrical machine housing mold; molding a polymeric electrical machine housing including a stator band with an integral non-drive end endplate using the polymeric material and the electrical machine housing mold, wherein the molding of the polymeric housing includes overmolding the stator with the winding overhangs within the stator band; inserting a metallic structure into a drive end endplate mold; molding a drive end endplate using the polymeric material and the drive end endplate mold, including forming a plurality of polymeric ribs in the drive end endplate, and including overmolding the metallic structure into the drive end endplate, the metallic structure being constructed to enhance mechanical stiffness of the drive end endplate; installing a rotor assembly into the polymeric electrical machine housing; and installing the drive end endplate onto the polymeric electrical machine housing, characterized in that the drive end endplate is molded to include a rabbet, a cavity disposed radially inward of the rabbet, and at least one drain hole that opens to the cavity and to an outer diameter of the drive end endplate to drain fluid entering the cavity.