Holistic Efficiency Map Calculation of Variable Flux Machines Regarding Relative Magnetisation

An algorithm for the integral calculation of efficiency maps of variable flux machines under consideration of the relative flux level is presented. The general idea and the algorithm logic are presented in detail and the efficiency map calculation is validated against a conventional gradient based efficiency map calculation algorithm. Instead of calculating efficiency maps for discrete flux levels and interpolating these maps afterwards, the algorithm presented here directly includes the relative magnet flux in the efficiency calculation. The presented approach uses torque and voltage surfaces in a plane of current, current angle and flux level. As results, the an exemplary efficiency map calculated with the algorithm is presented and the effect of different numbers of underlying data sets are discussed. Finally, a short outlook on practical applications is given.