In this paper, the finite element method is used in order to determine electrical parameters of a machine winding lumped element model. Thanks to this model, it will be possible to determine the electrical behavior of electrical machine winding fed by a power converter and thus to study the distribution of the turn-to-turn maximum voltage stress as early as the design process. The suitability of the method is validated by comparison with measurements.

In this paper, the finite element method is used in order to determine electrical parameters of a machine winding lumped element model. Thanks to this model, it will be possible to determine the electrical behavior of electrical machine winding fed by a power converter and thus to study the distribution of the turn-to-turn maximum voltage stress as early as the design process. The suitability of the method is validated by comparison with measurements.

Early aging of electrical machines is most commonly due to Electrical Insulation System (EIS) faults. Depending on the applications the electrical machine is used for, the EIS is subject to different stress factors, such as thermal, mechanical and electrical stresses, which can lead to a progressive deterioration of the organic materials it is made of, especially in terms of insulative properties. The aim of this paper is to show that it is possible to anticipate the change of those insulative properties in order to implement it in a predictive diagnostic tool allowing to highlight the parameters which are the best to monitor while the electrical machine is running under normal operation conditions.

In more electric aircrafts, the fast-fronted pulses imposed by PWM inverters to the motor windings may cause an earlier aging of the thin polymer layers of the electrical insulation system (EIS). In low-pressure environments, the voltage distribution in all the components of the EIS is major issue for designing long-life electrical machines. The voltage stresses in the thin insulating layers of the compact machines must remain under control for avoiding partial discharges (PD). The paper proposes an approach based on High Frequency (HF) equivalent circuits for analyzing the resonances in a motor winding. The paper focuses on the windings of permanent magnet synchronous machines built with one coil per stator slot.