DESIGN STUDY ON HYBRID EXCITATION FLUX SWITCHING MOTOR FOR ELECTRIC TAXIING SYSTEM IN AIRCRAFT

This paper presents an electric motor design for an electric taxiing system in aircraft. Electric motors for the electric taxiing system require high power density and high mechanical robustness of rotor. A hybrid excitation flux switching motor as a kind of variable flux motors is a good candidate because all active components such as permanent magnets and windings are located on the stator body essentially suitable for high speed rotation. An optimum design study on hybrid excitation flux switching motor is conducted based on finite element analysis using multi-objective genetic algorithm. For the design study, aluminum conductors for windings are introduced and a use of local non-magnetization technique for rotor electrical steel sheets are assumed to improve the power density and the rotor mechanical strength. Besides, the iron loss of rotor made of high-tensile electrical steel sheets is evaluated because an increase in iron loss is one of concerns with the high-tensile electrical steel sheets. The optimum design results based on finite element analysis show that both the power density with reduced rotor weight and the rotor mechanical stress using locally non-magnetized rotor high-tensile electrical steel sheets meet for the requirements.