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This paper provides a comparative study of several stator windings’ arrangements, to design a multi-three phase Surface-Mounted Permanent Magnet electric machine as part of a powerline for aircraft electric propulsion that includes several three-phase inverters, and a mechanical speed reducer. The objective of the study is to find the multi three-phase winding that gives the best compromise between all the aircraft requirements: maximum fault tolerance capability, and minimum powerline mass and losses. Following design considerations, a Half Bridge (HB) inverter, with a Y-connected distributed winding, was chosen for the electric motor. The multi three-phase winding modularity allows to operate in degraded mode, by turning off one or several inverters. However, the remaining available power depends on the winding arrangement, as well as the number of possible faults before a complete powerline failure. A qualitative comparison is therefore performed between the windings to assess their fault tolerance. Moreover, Design Optimization (DO) studies are carried out to compare the different modularity solutions in terms of power density and efficiency. The DO is performed on a system level, including the electric motor, the speed reducer and eventual passive filters that are necessary in faulty cases. Finally, some optimal motor designs are chosen and validated through Finite Element Analysis (FEA).

This paper presents a model of Surface Permanent Magnet motors for all-electric aircraft propulsion. A global Multiphysics model, including electromagnetic, loss, and mechanical physics, was developed based on analytical and semi-analytical equations. The global model is particularly relevant for design optimizations, as it is characterized by low computation times. The results obtained by each of these physics were compared with the Finite Element Analysis calculations, thus validating their accuracy and effectiveness. The model is used to study the performance of several motor configurations within an electric aircraft propulsion system, considering the losses and mechanical constraints.

This paper deals with the design of a 1-MW powerline for an all-electric aircraft propulsion based on Surface Permanent Magnet Motors. While considering only the electric motor and the gearbox, both are modeled with analytical and semi-analytical equations. A design optimization procedure with different machine topologies is performed, with two objectives: to minimize the system mass and losses. Moreover, the design on a system level allows to find the best suited system variables, such as the electric motor speed.

This paper deals with the tolerance to short circuit failures, in a high power, multi three-phase permanent magnet electric motor (MTP-PMSM) for aircraft propulsion. Through a winding arrangement, the Inter-Turn Short Circuit (ITSC) is replaced by an Inter-Phase Short Circuit (IPSC). The first IPSC failure can be mitigated through a passive technique, which consists in adding differential mode chokes (DMCs) between the phase pairs of the machine. In case of dual stars, this solution highly reduces the faulty currents at first failure, even in case of an unbalance between the subwindings. However, in case of a second failure in the same winding, using DMCs will not cancel the short-circuit current. Simulation results are given to confirm the analysis.

This paper deals with the electromagnetic analytical modeling of a yokeless rotor Surface Permanent Magnet Synchronous Motor (SPMSM) with Halbach-array magnetization for high-speed Aircraft application. Since the electromagnetic model is intended to be included in a Multiphysics global model for an optimization design, it should be fast and accurate. The chosen analytical model is based on the Maxwell equations solution, with a variable separation. Two versions, the Subdomain Method (SDM) and the Harmonic Modeling (HM) technique, are compared in terms of accuracy vs calculation time when compared to Finite Element Analysis (FEA).

Cette communication présente une méthode analytique simplifiée pour le calcul de l’induction magnétique radiale et orthoradiale, générées par le courant statorique dans le cas de machines synchrones à aimants en surface. Les résultats issus du modèle sont comparés à ceux obtenus par éléments finis avec de bonnes concordances. Enfin, sa rapidité est comparée à celle d’un modèle analytique de référence.