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This paper provides comparative test results for a brushless starter generator versus a brushed starter generator of equivalent nameplate rating. Key starter generator performance characteristics are measured by test and compared for each type of starter generator. These comparative performance parameters include: Generator output voltage versus load current versus drive speed Generator maximum output power capability versus drive speed Self excitation start-up capability (with no external source of control power) Efficiency during generate operation Efficiency during start operation Performance for high transient load applications Power quality, including ripple voltage and noise on the 28VDC bus Gear box torque induced stress during engine start Short circuit and over-load protection System weight Overhung moment for starter generator unit

General Dynamics, Airborne Electronic Systems in Redmond, Washington has recently developed new and innovative solutions for electrical power generation and distribution systems in small, turbine powered aircraft. The power generation systems utilize permanent magnet (PM) starter/generator (S/G) technology to achieve significantly lighter weight and higher reliability than conventional, brush-type aircraft generators. A Power Conversion Unit (PCU) is utilized in conjunction with the PM machine to provide accurately regulated and filtered aircraft power. The power distribution systems use Electronic Circuit Breakers (ECBs) that significantly reduce system weight and cost while enhancing reliability and flexibility. The ECBs are solid-state devices, are software programmable and communicate over a serial data bus.