Patent ID: 7122923
Filing Date: 2006-10-17
Classification: H02K

Abstract:
1. Power conversion apparatus comprising: a rotor comprising a cylindrical casing, and a predetermined number of permanent magnets disposed in the interior of the casing, the rotor being adapted for rotation about the axis of the casing over a predetermined operational range of rotational speeds; a stator comprising a core and at least one conductive winding, the rotor and stator being configured such that rotation of the rotor at and above a predetermined speed within the range of speeds tends to cause generation of heat that, if not dissipated, would raise the temperature of the magnets above a predetermined destructive level; and a cooling system for directing coolant flow into thermal contact with at least one of the winding and magnets, the cooling system generating sufficient coolant flow through a predetermined flow path at and above the predetermined speed to dissipate heat generated and maintain the temperature of the magnets below the predetermined destructive level.