A Virtual High-Frequency Signal Injection Based Maximum Torque per Ampere Control Method Considering Iron Loss for Aircraft Wound-Rotor Synchronous Starter-Generator in the Starting Mode

Wound-field synchronous machine has become an important candidate for the integrated stator-generator of more-electric aircraft. The aviation power system requires the wound-rotor synchronous starter-generator to have the ability of three consecutive starts. The large amount of heat generated during the starting process will increase the difficulty of the second and third starts. Therefore, it is of great significance to research maximum torque per ampere (MTPA) methods that can reduce the stator copper loss of the main machine. Traditional MTPA control method ignores iron loss, which lead to errors of MTPA point. This paper proposes a virtual high-frequency signal injection based MTPA method considering iron loss. Simulation and experimental results have verified the effectiveness of the proposed MTPA method.