Patent ID: 11888356
Assignee: AMERICAN AXLE & MANUFACTURING, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A motor drive system comprising:
an electric motor having a stator and a rotor assembly that is received in the stator and rotatable about a rotational axis, the rotor assembly having a rotor shaft and single fin set, the rotor shaft defining a bore that is disposed longitudinally along the rotational axis, the bore defining an inner circumferential surface, the single fin set being unitarily and integrally formed, wherein a central hole is formed through the single fin set along the rotational axis, wherein a plurality of slots are formed into single fin set, the plurality of slots extending through the outer circumferential surface of the single fin set, each of the slots having a pair of side walls that are spaced circumferentially apart from one another and which are parallel to one another, wherein the central hole forms a first fluid passage that is configured to transmit cooling fluid through the single fin set in a first direction along the rotational axis, and wherein the slots form a plurality of second fluid passages that are configured to transmit cooling fluid through the single fin set in a second direction along the rotational axis that is opposite the first direction.