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A General method to Compute the Electric Flux Lines between Two Magnet Wires in Close Contact and Its Application for the Evaluation of Partial Discharge Risks in the Slots of Electric Machines Embedded in Future Transportation Systems

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Advances in Aerospace Science and Technology 2021年第1期6卷 24-42页

作者： Philippe Collin David Malec Yvan Lefevre LAPLACE Université de Toulouse CNRS INPT UPS France

The sizing of the Electrical Insulation System (EIS) is an important challenge in electric motors of higher specific power driven by faster inverters. That keeps increasing the electric stress which the winding is submitted in the stator slot. Consequently, Partial Discharges (PD) are more likely to occur. Nowadays, the Paschen’s criterion is widely used to evaluate the risk of partial discharge. It requires the knowledge of electric field lines. This paper presents a method to precisely compute the electric field lines in a two-dimensional (2D) electrostatic problem. The field of study is composed of two magnet wires in close contact. Such configuration is representative of the turn-to-turn interaction in an electric motor slot. The problem is solved using the scalar potential formulation only. The notion of flux tubes is used for the

关键词： Partial Discharges Dielectric Constant Electric Motor Finite Elements Paschen’s Criterion ballistic method

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Space Guns for the Moon and on the Moon

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Journal of Physical Science and Application 2017年第5期7卷 59-66页

作者： Aleksey Vitalievich. Staroverov Oleg Borisovich. Khavroshkin Moscow State Technical University (former Emperor 's) Moscow 107005 Russia Institute of Physics of the Earth Russian Academy of Sciences Moscow 123810 Russia

Space gun--a device for launching objects in space. It refers to rocket-free methods of output objects into orbit. Space gun is not able to deliver the object in stationary orbit around the planet, for this, it must be equipped with a rocket engine to adjust the course after launch the object. This makes it possible to replace the existing excessively expensive rocket systems with new methods of delivering payload （space gun）. Thus, the costs of scientific programs are decreasing at times, and many studies are becoming available, less risky and environmentally safer.

关键词： Moon ballistic method space gun less risk safety.

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