A rotor assembly for an electric machine, the rotor assembly configured to rotate about an axis of rotation, the rotor assembly comprising: a core being molded, formed, or bored from a non-laminated or non-lamination, solid or unitary body material, the core having: at least two posts extending radially from the rotor core, and each post at least partially defining a winding seat at an interface of a rotor winding and the post; and at least two recesses positioned on and extending, based on the axis of rotation of the rotor assembly, radially inward from a radially outer surface of each post; the rotor assembly further comprising: at least two radial elements; and at least two caps formed by a plurality of laminations, and each cap comprising at least one projection, each cap being coupled to one of the at least two posts when the at least one projection is received within the respective recess, each cap having a portion overlying the respective winding seat to define an axially extending winding slot with one of the at least two radial elements and the respective post of the core, wherein each radial element is adjacent to a cap and located circumferentially between two caps; and the rotor winding being wound about the respective post and received by the respective winding seat to define a pole for the electric machine, wherein the rotor winding overlies the respective post and the projection of the respective cap; wherein the core comprises at least one internal coolant passage on each of the at least two posts and at least one radial coolant passage, characterized by each internal coolant passage having a radial coolant passage radially extending to it from a center of the core; and wherein the caps are made from material that is less electrically conductive than the core. a core being molded, formed, or bored from a non-laminated or non-lamination, solid or unitary body material, the core having: at least two posts extending radially from the rotor core, and each post at least partially defining a winding seat at an interface of a rotor winding and the post; and at least two recesses positioned on and extending, based on the axis of rotation of the rotor assembly, radially inward from a radially outer surface of each post; the rotor assembly further comprising: at least two radial elements; and at least two caps formed by a plurality of laminations, and each cap comprising at least one projection, each cap being coupled to one of the at least two posts when the at least one projection is received within the respective recess, each cap having a portion overlying the respective winding seat to define an axially extending winding slot with one of the at least two radial elements and the respective post of the core, wherein each radial element is adjacent to a cap and located circumferentially between two caps; and the rotor winding being wound about the respective post and received by the respective winding seat to define a pole for the electric machine, wherein the rotor winding overlies the respective post and the projection of the respective cap; at least two posts extending radially from the rotor core, and each post at least partially defining a winding seat at an interface of a rotor winding and the post; and at least two recesses positioned on and extending, based on the axis of rotation of the rotor assembly, radially inward from a radially outer surface of each post; the rotor assembly further comprising: at least two radial elements; and at least two caps formed by a plurality of laminations, and each cap comprising at least one projection, each cap being coupled to one of the at least two posts when the at least one projection is received within the respective recess, each cap having a portion overlying the respective winding seat to define an axially extending winding slot with one of the at least two radial elements and the respective post of the core, wherein each radial element is adjacent to a cap and located circumferentially between two caps; and the rotor winding being wound about the respective post and received by the respective winding seat to define a pole for the electric machine, wherein the rotor winding overlies the respective post and the projection of the respective cap; at least two radial elements; and at least two caps formed by a plurality of laminations, and each cap comprising at least one projection, each cap being coupled to one of the at least two posts when the at least one projection is received within the respective recess, each cap having a portion overlying the respective winding seat to define an axially extending winding slot with one of the at least two radial elements and the respective post of the core, wherein each radial element is adjacent to a cap and located circumferentially between two caps; and the rotor winding being wound about the respective post and received by the respective winding seat to define a pole for the electric machine, wherein the rotor winding overlies the respective post and the projection of the respective cap; wherein the core comprises at least one internal coolant passage on each of the at least two posts and at least one radial coolant passage, characterized by each internal coolant passage having a radial coolant passage radially extending to it from a center of the core; and