Capstone Turbine Corporation

David A Stahl

Phillip B Vessa

Matthew J Stewart

Dinyu Qin

A magnet machine includes a magnet rotor. The rotor includes a sleeve and a magnet. The magnet is positioned within the sleeve. A highly electrically conductive, nonmagnetic shield surrounds the magnet. The shield reduces rotor eddy current losses and lowers rotor operating temperature, thereby improving efficiency of the machine.

Rotor shield for magnetic rotary machine

A permanent magnet rotor cooling system and method in which the rotor end cap includes an axially extending bore with a plurality of radially extending holes aligned with holes in the sleeve around the permanent magnet to provide cooling air flow to the air gap between the permanent magnet sleeve and the stator. A second smaller diameter extended bore, with a second plurality of radially extending holes, offset from the first plurality of holes, may also be provided.

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Thousand Oaks, CA, United States of America

David A Stahl