Patent ID: 8648506

Claim:
An electric machine module comprising; an electric machine including a rotor assembly, the rotor assembly including: a first set of rotor laminations, the first set of rotor laminations including a portion having a first inner radius and at least one coolant opening, the first set of rotor laminations are positioned relative to one another so that each of the at least one coolant openings substantially align to form separate coolant paths on each axial side of the rotor assembly, wherein each coolant path extends from a substantially central location within the rotor assembly in a substantially axial direction along a portion of the axial length of the rotor assembly; and wherein the coolant paths are configured and arranged to allow liquid to flow axially outward through the coolant paths to drain into a machine cavity; a second set of rotor laminations, the second set of rotor laminations including a portion having a second inner radius larger than the first inner radius, and a rotor hub including, a center support, the rotor hub coupled to a shaft and having a diameter larger than a diameter of the shaft; at least one substantially circumferential flow channel disposed substantially around a circumference of the rotor hub, the at least one substantially circumferential flow channel defined between the first set of rotor laminations, the second set of rotor laminations, and the rotor hub, the at least one substantially circumferential flow channel defining at least a portion of the coolant paths.