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2 Transactions on Environment and Electrical Engineering

2 2017

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Calculation of the influence of slot geometry on the magnetic flux density of the air gap

Lima R. A. de, Coimbra A. C. P., Almeida T., Gomes V. M., Pereira T. M., Alves A. J., Calixto W. P.

Transactions on Environment and Electrical Engineering

2017

Vol. 2, No. 1

81--89

The objective of this work is to investigate the influence of slotted air gap constructive parameters on magnetic flux density of rotating machines. For this purpose, different approaches were used to solve the air gap field diagram using finite element method and the magnetic field distribution uniformity was evaluated by Carter's factor calculation on two-dimensional and three-dimensional models. Sensitivity analysis of slot constructive parameters was performed and results show that slot geometry modifies the magnetic flux on air gap and shifts the air gap magnetic equipotential midline of double slotted machines. Finally, minimization of Carter’s factor on two-dimensional model presents an optimized slot geometry with a near uniform magnetic flux density distribution.

Analysis and monitoring of electrical grounding grid encapsulated with concrete: case study using simulation in finite element method

Pereira T. M., Lima R., Gomes V. M., Calixto W. P., Alves A. J.

Transactions on Environment and Electrical Engineering

2017

Vol. 2, No. 2

31--36

This work study the influence of concrete, plaster, clay and others buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons on different grounding systems. The study includes comparison of six different grounding system on dry season and wet season. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest.