Patent ID: 8760015
Filing Date: 2014-06-24
Classification: H02K

Abstract:
1. A cooling system for a sealed permanent magnet electric machine comprising: one or more flow-driving devices disposed at a rotor of the electric machine configured to urge an airflow across a plurality of permanent magnets of the rotor and across a plurality of stator end turns of a stator of the electric machine to remove thermal energy therefrom; a plurality of cooling channels disposed in the electric machine in thermal communication with the stator configured to transfer thermal energy from the stator to a flow of fluid coolant through the plurality of cooling channels; and a coolant to air heat exchanger in thermal communication with the plurality of cooling channels to transfer thermal energy from the airflow to the fluid coolant, the coolant to air heat exchanger disposed radially inboard of the plurality of cooling channels, with the cooling channels disposed radially between the coolant to air heat exchanger and the stator; wherein the permanent magnets of the rotor are disposed radially outboard of the stator of the electric machine.