Research on Fault-tolerant Control of Five-phase Fault-tolerant Servo Motor Drive System Based on Reduced-order Decoupling

In order to improve the unified performance and reliability of combat equipment, electric drive systems play an increasingly important role in weapons and equipment. Highly reliable electric drive weaponry has become the direction in which countries are striving to break through. A highly reliable five-phase permanent magnet fault-tolerant servo motor(PMFSM) servo system for missile electric servos is proposed, which often fail to operate reliably and stably due to inevitable electrical failures caused by the harsh working environment. In order to maintain the effective stator magnetomotive force constant and realize the vector control strategy for the motor drive system in fault mode, a set of Clark and Park transformation matrix for single-phase open-circuit fault is proposed. A voltage compensation strategy is proposed to attenuate the effect of neutral potential shift on space vector pulse width modulation(SVPWM) for the winding neutral position shift in fault mode. The proposed fault-tolerant control strategy for the five-phase PMFSM drive system is verified through simulation and experiment to enable highly reliable fault-tolerant operation of the five-phase PMFSM under single-phase open circuit faults in the windings, resulting in a more reliable and fault-tolerant missile electric servo system.