Design of Ultrahigh Speed Alternator Systems for Mobile Power

To meet the demand for light-weight mobile power, turboalternator sets can be operated at ultra-high speeds approaching 100 000 r/min. The high frequency alternator output is converted by static devices to standard ac frequencies and/or dc power for utilization. This paper describes the design of brushless alternator systems for such applications. The particular suitability of the homopolar inductor generator is cited. Special features are described, including methods of limiting pole face losses, windage and other losses. The operating conditions require particular attention to material selection. Interface problems between the alternator and turhine are also discussed.