Research of current symmetry on dual-redundancy

Electric actuator dual-redundancy servo system consists of dual-redundancy rare earth permanent magnet (REPM) brushless DC Machine (BLDCM), digital signal processor (DSP) and some periphery circuits. Here, Dynamic and static states of current symmetry on dual-redundancy working is emphatically investigated. It analyses the causes of current asymmetry and possible consequences, gives a method of current symmetry and makes use of it in a real system, compares the experiment results of current symmetry and asymmetry in this system, which shows that the method is simply and practically to be reality, two redundancies currents are more obviously consistent after adding current symmetry to this system than before, the system performance is improved greatly.