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This work deals with the modeling and analysis of a phasor-controlled Starter/Generator (S/G) electrical machine during starting either an aircraft Main Engine (ME) or Auxiliary Power Unit (APU). The model can be used to determine how much stator and exciter current is required to be supplied by a controlled power converter to the S/G to meet the start torque profile. In addition to modeling details and simulation results the paper presents a thorough analysis of the S/G machine, its environment and control.