Patent ID: 8350423

Claim:
A cooling system for a motor having control circuitry and including a motor housing surrounding the motor, the motor housing having an outer surface the motor driving at least one radial fan at one end thereof for directing airflow across the motor housing, the cooling system comprising: a fan housing mountable to the motor housing at the one end of the motor, said fan housing defining a cavity surrounding the radial fan, said fan housing defining a circumferential flange configured to be offset from the outer surface of the motor housing when the fan housing is mounted thereto and configured to direct airflow from the fan axially across substantially the entire outer surface of the motor housing, said fan housing further defining a diverter chamber in communication with said cavity and radially outboard of the fan, said diverter chamber sized to divert the majority of the airflow generated by the fan away from said circumferential flange; and a base having a heat sink for contacting the control circuitry, said base defining a plenum in communication with said diverter chamber and a channel in communication with said plenum and said heat sink to direct the diverted airflow across the heat sink.