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 . <EOS>