A rotor for a generator, comprising: a rotor body; rotor poles extending radially outward from the rotor body, wherein each rotor pole includes a pole body and opposing pole circumferential side surfaces (150A,150B) that are spaced apart from each other in a circumferential direction about the rotor body; coil windings wound about the rotor poles to form a wire bundle against one of the pole circumferential side surfaces; and a wire separator, disposed within the wire bundle, that divides the coil windings within the wire bundle into subsets of wire bundles, wherein: the wire separator, and adjacent coil windings of the wire bundle, define an edge cooling channel therebetween; and the coil windings of the wire bundle define an intra-bundle cooling channel therebetween, wherein the intra-bundle cooling channel is at a location spaced apart from inner and outer circumferential boundaries of the wire bundle and inner and outer radial boundaries of the wire bundle, and wherein the edge cooling channel is larger than the intra-bundle cooling channel, wherein the wire separator comprises one or more of: a radial wire separator that extends in the radial outward direction between the inner and outer radial boundaries of the wire bundle; and characterized in that the wire separator further comprises a circumferential wire separator (190B1,190B2) that extends in the circumferential direction between the inner and outer circumferential boundaries of the wire bundle, wherein the wire separator comprises: a plurality of the circumferential wire separators (190B 1, 190B2) that are spaced apart from each other in the radial outward direction within the wire bundle, whereby the wire separator forms at least three of the subsets of wire bundles a rotor body; rotor poles extending radially outward from the rotor body, wherein each rotor pole includes a pole body and opposing pole circumferential side surfaces (150A,150B) that are spaced apart from each other in a circumferential direction about the rotor body; coil windings wound about the rotor poles to form a wire bundle against one of the pole circumferential side surfaces; and a wire separator, disposed within the wire bundle, that divides the coil windings within the wire bundle into subsets of wire bundles, wherein: the wire separator, and adjacent coil windings of the wire bundle, define an edge cooling channel therebetween; and the coil windings of the wire bundle define an intra-bundle cooling channel therebetween, wherein the intra-bundle cooling channel is at a location spaced apart from inner and outer circumferential boundaries of the wire bundle and inner and outer radial boundaries of the wire bundle, and wherein the edge cooling channel is larger than the intra-bundle cooling channel, wherein the wire separator comprises one or more of: a radial wire separator that extends in the radial outward direction between the inner and outer radial boundaries of the wire bundle; and characterized in that the wire separator further comprises a circumferential wire separator (190B1,190B2) that extends in the circumferential direction between the inner and outer circumferential boundaries of the wire bundle, wherein the wire separator comprises: a plurality of the circumferential wire separators (190B 1, 190B2) that are spaced apart from each other in the radial outward direction within the wire bundle, whereby the wire separator forms at least three of the subsets of wire bundles the wire separator, and adjacent coil windings of the wire bundle, define an edge cooling channel therebetween; and the coil windings of the wire bundle define an intra-bundle cooling channel therebetween, wherein the intra-bundle cooling channel is at a location spaced apart from inner and outer circumferential boundaries of the wire bundle and inner and outer radial boundaries of the wire bundle, and wherein the edge cooling channel is larger than the intra-bundle cooling channel, wherein the wire separator comprises one or more of: a radial wire separator that extends in the radial outward direction between the inner and outer radial boundaries of the wire bundle; and characterized in that the wire separator further comprises a circumferential wire separator (190B1,190B2) that extends in the circumferential direction between the inner and outer circumferential boundaries of the wire bundle, wherein the wire separator comprises: a plurality of the circumferential wire separators (190B 1, 190B2) that are spaced apart from each other in the radial outward direction within the wire bundle, whereby the wire separator forms at least three of the subsets of wire bundles a radial wire separator that extends in the radial outward direction between the inner and outer radial boundaries of the wire bundle; and characterized in that the wire separator further comprises a circumferential wire separator (190B1,190B2) that extends in the circumferential direction between the inner and outer circumferential boundaries of the wire bundle, wherein the wire separator comprises: a plurality of the circumferential wire separators (190B 1, 190B2) that are spaced apart from each other in the radial outward direction within the wire bundle, whereby the wire separator forms at least three of the subsets of wire bundles a plurality of the circumferential wire separators (190B 1, 190B2) that are spaced apart from each other in the radial outward direction within the wire bundle, whereby the wire separator forms at least three of the subsets of wire bundles