Water-cooled AC and DC motor-generator set on a common shaft with series cooling flow path

Abstract

A motor-generator set includes a rotatable central shaft and an AC rotor and a DC rotor being supported in tandem relationship along the shaft for rotation therewith. A liquid coolant flow path is defined in a series relationship through the shaft and rotors. A first portion of the serial liquid coolant flow path runs into and through a first single bore in one end portion of the shaft, a second portion of the serial flow path runs through the AC rotor, a third portion of the serial flow path runs through a middle portion of the shaft, a fourth portion of the serial path runs through the DC rotor, and a fifth portion of the serial flow path runs through and from an opposite end of the shaft. The middle and opposite end portions of the shaft, providing the third and fifth portions of the serial flow path, are formed by opposing end sections of a second single bore in the shaft and a plug disposed in a middle section of the second bore so as to substantially sealably isolate the opposing end sections from one another.

Dependencies are inferred from the claim text.