Nonlinear modeling and simulation of single phase doubly salient permanent magnet generator

This paper presents the nonlinear modeling and simulation of a newly conceived doubly salient permanent magnet (DSPM) generator. Since a DSPM machine is highly nonlinear like a switched reluctance machine, utilization of generalized machine theory or lumped parameter modeling is not applicable. Utilization of first order approximations for inductance and back EMF waveforms in simulations does not yield an accurate analysis. Therefore, a numerical approach using cubic splines is developed to extract useful information such as position and current dependent inductance and back EMF terms from the flux linkage/current/rotor position relationship. This approach is inherently more accurate than using the first order approximations, and general enough that it can be applied to any other highly-nonlinear machines, such as a switched reluctance machine. The accuracy of the approach is also verified with experimental data.