Calculation of flux linkages of the dual-redundancy permanent magnet brushless machine from magnetic circuit model to finite element analysis

Different from the conventional dual-redundancy permanent magnet brushless machine (DRPMBLM), the windings of the novel DRPMBLM were placed in opposite series and driven by two independent sets of power electronic circuits. Thereby an electrical driven system with dual control channels was formed, and a fault tolerated operation mode could be used in this system for high reliability. On the bases of analysing the structure and principle of DRPMBLM, the mathematical model of the magnetic equivalent circuits in each channel winding for DRPMBLM was constructed, and the air gap flux and back electromotive force and the flux matrix which consists of several permeances were derived. The practicability of this model was increased because the effects of the magnetic circuit of yoke flux paths and the nonlinear magnetic saturation were included. The validity of the mathematical model is verified by the results of the finite element analysis.