The Starter Generator (SG) system is an important feature and key supporting technology for More-Electric-Aircraft (MEA) and All-Electric-Aircraft (AEA). Since it is free from frequency constraints, high-voltage DC (HVDC) SG can work at higher speeds, which can further improve the power density and the system reliability. High-power HVDC power system has become an important development direction for aircraft power systems. This paper proposes the architecture of a HVDC SG system based wound rotor synchronous machine and elaborates on its composition and working principles. The operating characteristics of the Permanent Magnet Machine (PMG), the Main Exciter (ME), and the Main Generator (MG) under the generating mode and the starting mode are summarized. The constant current source characteristic and the current amplifier characteristic of the ME under the generating mode are analyzed in detail. Meanwhile, the torque generation principles and the influencing factors of the MG, together with the single-phase AC excitation characteristics of the ME, are discussed and analyzed with simulation methods. Finally, the generating and starting experiments of a 120 kW/270 V wound rotor HVDC SG are carried out. The integrated experimental platform for the starter generator system is constructed, and the power generation and engine simulation start-up experiments are carried out. The experimental and simulation results are consistent. The breakthrough of the key technology of high-power wound rotor HVDC SG system lays the technical foundation for its installed application on the new generation of aircraft.
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