Torque ripple minimisation methods in sinusoidal fed synchronous permanent magnet machines

In this paper, the authors present a torque ripple analysis method, based on an analytical solution of the equation which governs the magnetic field distribution in the different parts of the machine. The considered model corresponds in fact to a smooth pole and slotless stator structure. Nevertheless, if the stator is slotted, the model remains a usable approximate representation, in as much as the reluctance effects introduced by the slots are not considered. The proposed analysis is finally experimentally validated thanks to a modulatable model which permits the testing of different magnet arrangements and different winding structures.