Patent ID: 8450890
Filing Date: 2013-05-28
Classification: H02K

Abstract:
1. A rotor for a liquid cooled electric machine comprising: a rotor shaft rotatably disposed at a central axis; and a plurality of coolant passages disposed radially inboard of a stator of the electric machine, each coolant passage extending radially along the rotor and having a closed cross-section and including at least one coolant passage inlet positioned radially outboard of the rotor shaft and at least one coolant passage outlet, the at least one coolant passage inlet being configured and disposed to receive a flow of liquid coolant passing entirely radially outwardly of the rotor shaft, the plurality of coolant passages configured to rotate about the central axis and direct a flow of liquid coolant substantially outwardly therethrough to impinge on a stator end turn of the electric machine thereby removing thermal energy from the stator end turn.