Patent ID: 7977845

Claim:
An induction motor, comprising: a stator including an inner passage having a longitudinal axis defining a bore; a steel rotor rotatably disposed within the bore of the stator, the steel rotor comprising: a cylindrical portion extending between a proximal end and a distal end, a proximal end portion disposed at the proximal end and extending orthogonally to the cylindrical portion, and a distal end portion disposed at the distal end and extending orthogonally to the cylindrical portion; and a Hot Isostatic Pressing (HIP) layer of copper integrally adhered to an outer surface of the steel rotor, the HIP layer of copper comprising: a cylindrical HIP layer of copper integrally adhered to the cylindrical portion of the rotor, a proximal HIP layer of copper integrally adhered to the proximal end portion of the rotor, and a distal HIP layer of copper integrally adhered to the distal end portion of the rotor; an air gap formed between an outer surface of the HIP layer of copper and an inner surface of the stator and extending along the longitudinal axis of the stator; a fan shroud; and a fan system, comprising: a set of fan blades affixed to an outer surface of the rotor, and a set of vanes affixed to the fan shroud; wherein the proximal HIP layer of copper and the distal HIP layer of copper are configured to provide a short circuit flux path across the rotor to engage with complementary poles of the stator; and wherein the fan blades affixed to the rotor and the vanes affixed to the fan shroud are pneumatically coupled to each other and cooperatively configured to direct cooling air to flow through the air gap axially around the rotor.