Estimation of the direct-axis inductance in PM synchronous motor drives at standstill

The call for human mobility reduction pushes research in electrical drives towards the implementation of efficient self-commissioning procedures. As a preliminary and crucial step, an accurate estimation of motor parameters is necessary. As a part of a process of careful review of existing and often either rough-and-ready or bulky estimation methods, this work copes with the light and precise estimation of the direct flux linkage in permanent magnet motors at standstill. The estimation is based on multi-sinusoidal signal injection, and signal post-processing through Goertzel algorithm, for the sake of very low computational complexity. The procedure considers both iron losses and saturation effects. A set of experimental results show the feasibility of the method, while the comparison with finite element analysis confirms the accuracy of the estimation.