Design of non-similar dual-redundant electromechanical actuation system for UAV landing gear

This paper puts forward the design of non-similar dual-redundant electromechanical actuation system for UAV landing gear, in which the main redundancy adopts multi-motor control center with digital signal processor (DSP) and field programmable gate array (FPGA) as its core algorithm, and the slave redundancy uses logic circuit to realize open-loop speed control. Due to the low real-Time demanding characteristics of landing gear actuation system, the master redundancy is controlled by a DSP and an FPGA with time sharing method. The slave redundancy is used for emergency control once encountering the malfunction of master redundancy. The slave redundancy only operates with the rotor position information provided by hall, ignoring the speed command of flight control computer, and generates three-phase control logic signal of the brushless DC motor, then it can complete the emergency action at a certain speed. This UAV landing gear using non-similar dual redundancy electromechanical actuation system canceled complex hydraulic lines and hydraulic actuators, which can improve maintainability and reliability effectively.