New analytical method for PMSM magnet losses estimation based on fourier series

Nowadays, new topologies and applications lead to higher permanent magnet synchronous machine (PMSM) rotor losses, which can cause magnet heating and even fully demagnetization. Though exists a good deal of magnet loss estimation strategies some of them, based in FEM, are very time consuming to be applied in motor design processes and most of the analytical models are difficult to use or only take into account partial aspects of this phenomenon. This paper presents a straightforward and analytical estimation method for magnet loss estimation of a PMSM taking into account the losses caused by both; MMF temporal and spatial harmonics and stator slotting effect. In order to achieve this goal, a study based in the solution of Maxwell equations by means of the Fourier series is applied. The calculated results are compared with those obtained with FEM simulation software FLUX2D^®.