scholarly journals A comparative analysis between classical and modified approach of description of the electrical machine windings by means of T0 method

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 918-923
Author(s):  
Rafał M. Wojciechowski ◽  
Cezary Jędryczka
Keyword(s):  
Comparative Analysis ◽  
Current Density ◽  
Electrical Machines ◽  
Electrical Machine ◽  
Current Density Vector ◽  
Edge Element ◽  
Classical Formulation ◽  
Density Vector ◽  
Element Method

AbstractThis paper deals with comparative analysis between classical and modified approach of description of electrical machines windings by means of theT0method. The classical formulation (CF) ofT0method in which the distribution of the turns in the winding is treated the same as naturally determined current paths has been compared to the modified formulation (MF), in which by incorporating coefficients differencing the conductivity the homogeneity of the current density vectorJ0,i.e. turns distribution is achieved. The method of calculating the coefficients correcting the conductivities for the MF approach has been presented. For solving ofT0method equations, the edge element method (EEM) has been incorporated.

scholarly journals THE ELECTRICAL CURRENT DENSITY VECTOR IN THE INNER PENUMBRA OF A SUNSPOT

2010 ◽  
Vol 721 (1) ◽  
pp. L58-L61 ◽  
Author(s):  
K. G. Puschmann ◽  
B. Ruiz Cobo ◽  
V. Martínez Pillet
Keyword(s):  
Current Density ◽  
Electrical Current ◽  
Current Density Vector ◽  
Density Vector ◽  
Electrical Current Density

scholarly journals Electro-plastic metal cutting

2019 ◽  
Vol 75 (6) ◽  
pp. 735-740
Author(s):  
O. A. Troitskii ◽  
V. I. Stashenko
Keyword(s):  
Cast Iron ◽  
Friction Force ◽  
Current Density ◽  
Metal Cutting ◽  
Pulse Current ◽  
High Strength ◽  
Heating Zone ◽  
Current Density Vector ◽  
Plastic Metal ◽  
Density Vector

In the process of cutting of steels, high strength and heat-resistant alloys a strong warming-up of the cutting instrument takes place, necessitating its cooling by special emulsions and resulting in quick wear and increase of products cost. It was determined by experiment, that during a metal with current cutting, an electro-plastic effect arises. During the lector-plastic cutting, the plastic deformation of a metal under pulse current effect becomes easier, making the friction force between the metal chips and the cutting instrument front edge lower. The electro-plastic metal cutting method accounting the current polarity, current density vector directions, as well as pulse current parameters, can considerably improve the cut surface microstructure and increase the instrument service life. At that, the thermal regime of the cutting can be lowered due to cutting force lowering and heating zone shifting inside the piece or the instrument due to Thomson effect. It was shown, that during the electro-plastic metal cutting the friction force can decrease by 25–30% at the favorable current density vector orientation, as it takes place during electro-static metal drawing and rolling. The current plasticizing action results in decreasing friction force and the chips twisting radius, which can be confluent even for cast iron. At the example of metal drilling with the pulse current, the important current effects on the cutting mechanical parameters revealed. The conditions of metal electro-plastic cutting stated. Results of the experiment study of metal electro-plastic cutting quoted for the processes of steel and cast iron drilling.

Derivation of the full current density vector in the Earth's ionosphere low- and mid-latitude F region using ESA's Swarm satellites

2020 ◽  
Author(s):  
Martin Fillion ◽  
Gauthier Hulot ◽  
Patrick Alken ◽  
Arnaud Chulliat ◽  
Pierre Vigneron
Keyword(s):  
Current Density ◽  
Current System ◽  
Three Dimensional ◽  
Current Density Vector ◽  
F Region ◽  
Swarm Satellites ◽  
Density Vector ◽  
Dynamical Features ◽  
The One ◽  
Swarm Satellite

<p>A new multi-spacecraft method to recover estimates of the average three-dimensional current density in the Earth's ionosphere is presented. It is demonstrated using the ESA's Swarm satellite constellation and by taking advantage of the favorable geometrical configurations during the early phase of the mission. The current density vector is calculated inside prisms whose vortices are defined by the satellite positions. The mathematical formalism differs from previous approaches such as the one known as the ”curlometer”. It makes use of the well-known curl-B technique and involves an inverse problem which allows for error propagation through the calculation. Data from the vector field magnetometers of the three satellites are used and special care is taken to characterize the errors on these data. The method is applied in the low- and mid-latitude F-region on 15 February 2014. It provides latitudinal profiles of the full current density vector together with the associated error bars in the morning and evening sectors. We observe several dynamical features such as clear signatures of field-aligned interhemispheric currents, potential signatures of the wind dynamo current system as well as mid-latitude east-west currents.</p>

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