航空用功率电传作动器电机热退磁故障演化规律研究OA

With the development of more electric aircraft technology,power-by-wire actuators,represented by electro-hydrostatic actuators and electromechanical actuators,have become key components in next-generation aircraft actuation systems.However,under complex flight conditions,the permanent magnet synchronous motor(PMSM),as the core of the power-by-wire actuator,is characterized by high losses,high temperature rise,and strict reliability requirements.Its thermal characteristics significantly affect the evolution of the demagnetization fault.This study investigated PMSMs in aircraft power power-by-wire actuators and established a multi-field coupling model for temperature rise solution.Thermal demagnetization behaviors of permanent magnets were analyzed,and the evolution mechanism of thermal demagnetization was explored.Simulation results reveal the demagnetization fault characteristics and thermal demagnetization patterns under thermal accumulation and alternating loads.During the motor's operation,both reversible demagnetization and progressive irreversible demagnetization occur,with the potential for sudden permanent magnet failure after exceeding its lifespan.It provides theoretical support and technical guidance for improving the reliability,design optimization,and fault prediction of power-by-wire motors.