A dual redundancy technique for electromechanical actuation system applied to launch vehicles

This paper presents, an Electro-Mechanical Actuator (EMA) based position control system with redundancy technique is being presented. The servo system is composed of two chains, a prime chain and a redundant chain, which includes the position servo system of the EMA. Only one chain works at a time, probably the main chain operates during normal condition of the system. A new, simpler fault detection and isolation (FDI) technique is being developed, which will be monitoring the prime chain continuously. If any type of fault occurs in the prime chain, the FDI isolates the prime chain from the system and switches to the redundant chain. Thereafter redundant chain will be driving the system. The system model is then simulated using MATLAB/Simulink, with trapezoidal waveforms of backemf. Using the DSP controller chip, TMS320F2812 as a control core, hardware implementation has been carried out.