Equivalent magnetic circuit analysis model of the steady state characteristics for the novel dual-redundancy permanent magnet brushless machine

Different from the conventional dual-redundancy permanent magnet brushless machine (DRPMBLM), the windings of the novel DRPMBLM are placed in opposite series and driven by two independent sets of power electronic circuits. Thereby an electrical driven system with dual control channels is 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 (MEC) in each channel winding for DRPMBLM is constructed, and the air gap flux and back electromotive force and the flux matrix which consists of several permeances are derived. The practicability of this model is increased because the effects of the magnetic circuit of yoke flux paths and the nonlinear magnetic saturation are included. The validity of the mathematical model is shown by the results of the finite element analysis (FEA).