Mathematical model and characteristics on dual-redundancy electromechanical actuation servo system

Electromechanical actuator(EMA) as the flight control system of the servo actuator has the advantages of small size and high power density. Dual-redundancy permanent magnet brushless motor(DRPMBLM) used in servo system improves the reliability of the work. The dual-redundancy servo actuation system mathematical model is established by the different system work modes and DRPMBLM of the structure characteristics of comparison. The cause and consequence of unequal torque in DRPMBLM are analyzed. The equal torque is realized by using crossed-feedback control and equalization algorithm or eliminated unequal torque. Theoretical analysis and experimental results show that the method can effectively eliminate the redundancy motor torque unequal. The system frequency response can achieve 3Hz, which can meet the requirements of electrically powered actuation system of more electric aircraft and all electric aircraft.