Optimal Design Solutions for Permanent Magnet Synchronous Machines

Abstract

This paper presents optimal design solutions for reducing the cogging torque of permanent magnets synchronous machines. A first solution proposed in the paper consists in using closed stator slots that determines a nearly isotropic magnetic structure of the stator core, reducing the mutual attraction between permanent magnets and the slotted armature. To avoid complications in the windings manufacture technology the stator slots are closed using wedges made of soft magnetic composite materials. The second solution consists in properly choosing the combination of pole number and stator slots number that typically leads to a winding with fractional number of slots/pole/phase. The proposed measures for cogging torque reduction are analyzed by means of 2D/3D finite element models developed using the professional Flux software package. Numerical results are discussed and compared with experimental ones obtained by testing a PMSM prototype

Design and fabrication of an outer rotor permanent magnet synchronous generator with fractional winding for micro‐wind turbines

“…Analysis of the outer rotor PMSG was performed by computer simulations using FEM after determining the initial design criteria. The use of fractional winding with slot-pole combination, which did not add additional cost to the manufacturer, was selected to reduce the CT, and the pole shifting was not needed depending on the detected data [22].…”

Aspects Regarding Operation Characteristics of Brush-less Direct Current Motors

“…The research carried out shows how the energy consumption can be reduced in exploitation [18], [20], by choosing adequately the permanent magnet. That is why, there has been chosen the criterion C e -exploitation cost and the objective function has resulted:…”

“…Their utilization in excitation systems has made possible to obtain some motors having a very high ratio torque developed/unit of volume, better performances, by miniaturization, some compact and reliable equipments. The lack of the excitation winding makes brushless direct current motors to have a better efficiency and a lower volume in comparison with the classical ones [18]- [19], [24]. For a certain air-gap magnetic induction, the volume of an inductor having permanent magnets is smaller than in the case of an inductor having electromagnetic inductor.…”

PMSGs Solutions for Gearless Wind Conversion Systems with Battery Storage

“…It consists of two star connected three-phase windings electrically shifted with 30°. The stator windings diagram of the three-phase PMSG is detailed in [9].…”