Optimization of the transverse-flux motor based on design of experiments

The objective of the paper is optimization of the outer rotor permanent-magnet transverse-flux motor using design of experiments. First, the 3-D time-stepping finite-element analysis is used to evaluate the relationship between the measured and calculated results. Further, in the 3-D time-stepping finite-element analysis a parametric model of the transverse-flux motor is coupled with an external three-phase current source to analyze the impact of the motor geometric parameters on its performance. The objectives of the motor geometry optimization are maximization of the nominal electromagnetic torque, minimization of torque pulsations, reduction of local magnetic saturation of ferromagnetic parts and increase in the current overloading regarding magnetic saturation. All the optimization objectives should be realized in a single transverse-flux motor design.