Patent ID: 8129878

Claim:
A rotor for an electrical generator, comprising: a rotor body, the rotor body having: a circular portion having a first side and a second side opposite the first side; and a cylindrical portion coaxial with the circular portion, the cylindrical portion extending from the first side of the circular portion, the circular portion and the cylindrical portion defining a longitudinal axis of the rotor body; a plurality of permanent magnets disposed on the cylindrical portion; a generally cylindrical recess defined by the cylindrical portion and the first side of the circular portion for receiving a stator; at least one first wall at least partially spaced apart from the first side of the circular portion, the at least one first wall and the first side of the cylindrical portion defining at least in part at least one chamber therebetween, the at least one chamber having an inlet; an aperture in the at least one first wall defining an outlet of the at least one chamber; and at least one second wall extending outwardly from the first side of the circular portion, the at least one second wall having an end portion adjacent to the inlet of the at least one chamber.