Variation of additional losses at no-load and full-load for a wide range of rated power induction motors

International audienc

Analysis of Flux Density and Iron Loss Distributions in Segmented Magnetic Circuits Made With Mixed Electrical Steel Grades

International audienc

Analyse of Flux Density and Iron Loss Distributions in Segmented Magnetic Circuits Made with Mixed Electrical Steel Grades

International audienc

High frequency resonance of AC machine windings, analyse of current and electromagnetic fields. Application to predictive maintenance

International audienceThe paper analyses the high frequency (HF) behaviour of an AC machine winding. The goal is to detect slight resonance frequency changes due to dielectric aging. The proposed monitoring system injects a low level HF voltage in the stator winding of the running machine and performs measurements on the corresponding current and external magnetic field. The analysis is carried out with an HF electrical equivalent circuit, which explains the choice of the frequency used by the monitoring system

Diyarbakır’ın Silvan İlçesinde Doğal Olarak Yetişen Badem (Prunus amygdalus L.) Tiplerinin Seleksiyonu

The paper develops an efficient computational method for establishing equivalent characteristics of magnetic joints of transformer cores, with special emphasis on step-lap design. This enables comparative analysis of designs without the need for difficult measurements

High frequency electromagnetic emissions of cylindrical laminated cores

International audiencePurpose - This paper aims to propose a high-frequency (HF) model able to compute the flux density in the vicinity of the laminated stator core of an AC machine. Design/methodology/approach - Experiments form the main approach. Analytical results previously obtained with a simplified rectangular laminated structure are confirmed with a standard cylindrical magnetic core. Findings - Three frequency domains are defined, depending on the skin depth relative to the thickness of the magnetic sheets. A methodological approach is proposed for each domain. For higher frequencies, the magnetic core can be considered as transparent for external field computation. Research limitations/implications - The HF model is valid for skin depths much lower than the thickness of the magnetic sheets. Practical implications - The proposed HF model provides a link between the weak field measured in the natural void existing between the stator core and the housing of large electrical machines. With such a link, it is possible to develop a new monitoring system able to detect and to localize the partial discharges in the stator winding of a large machine. Originality/value - The low-frequency limit of the model has been measured. It corresponds to a ratio of 1/40 between the skin depth and the magnetic sheet thickness. Therefore this model offers a new perspective for maintenance applications

Conception of a wireless cell for the energy consumption diagnosis of AC rotating machines

International audienc