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Full-Text Articles in Electromagnetics and Photonics
Developments In Finite-Element Method For Calculating Electromagnetic Fields In Electrical Machines, Mulukutla S. Sarma
Developments In Finite-Element Method For Calculating Electromagnetic Fields In Electrical Machines, Mulukutla S. Sarma
Sarma Mulukutla
In order to meet the specifications of an electrical apparatus, the designer must be able to analyze and modify several fields of interest such as the electromagnetic fields, with the ultimate aims of safety, reliability, simplicity, efficiency and economy. The numerical finite-element method is proving to be an accurate, economical and useful design tool for the field analysis in electrical machinery. This paper presents briefly the formulation of the finite-element technique for solving two- and three-dimensional field problems in nonlinear devices, and reviews various applications made so far, while putting forth some new developments. These developments along with the progress …
Finite Element Formation For The Numerical Solution Of Three-Dimensional Nonlinear Magnetostatic Field Problems As Applied To The Design Of Electric Machinery, Mulukutla S. Sarma
Finite Element Formation For The Numerical Solution Of Three-Dimensional Nonlinear Magnetostatic Field Problems As Applied To The Design Of Electric Machinery, Mulukutla S. Sarma
Sarma Mulukutla
Recent years have witnessed considerable research activity in the application of digital-computer methods for the determination of the electromagnetic fields in electrical machinery through the solution of Maxwell's equations, while taking full account of the magnetic saturation. Two distinct numerical approaches are evident in the literature: Finite-Difference Method and Finite-Element method. The author has presented in the recent years a finite-difference formulation for 3-dimensional numerical solutions of the nonlinear electromagnetic field problems in terms of potential functions, and has applied for the analysis of the end-zone fields of aerospace homopolar alternators and solid-rotor induction motors. The present work is directed …
Magnetostatic Field Computation By Finite Element Formulation, Mulukutla S. Sarma
Magnetostatic Field Computation By Finite Element Formulation, Mulukutla S. Sarma
Sarma Mulukutla
Recent years have witnessed considerable research activity in the application of digital-computer methods for the determination of the electromagnetic fields in electrical machinery through the solution of Maxwell's equations, while taking full account of the magnetic saturation. Two distinct numerical approaches are evident in the literature: Finite-Difference Method and Finite Element Method. The author has presented in the recent years a finite-difference formulation for 3-dimensional numerical solutions of the nonlinear electromagnetic field problems in terms of potential functions, and has applied for the analysis of the end-zone fields of aerospace homopolar alternators and solid-rotor induction motors. The present work is …
New Developments In The Computer-Aided Analysis Of Three-Dimensional Electromagnetic Field Problems As Applied To The Design Of Electrical Machinery, Mulukutla S. Sarma
New Developments In The Computer-Aided Analysis Of Three-Dimensional Electromagnetic Field Problems As Applied To The Design Of Electrical Machinery, Mulukutla S. Sarma
Sarma Mulukutla
An accurate knowledge of the magnetic as well as other field distributions is of great importance in design optimization. In two dimensional problems with the current flow in only one direction, the magnetic field can be solved by computing a scalar potential or one component of the vector potential, The general formulation for three-dimensional solutions, including nonlinearities, is more complex and requires all three components of the vector potential as well as a scalar potential for the description of the fields. It is the purpose of this paper to present a general systematic, novel formulation at low frequencies feasible for …
End-Winding Leakage Of Aerospace Homopolar Alternators, Mulukutla S. Sarma
End-Winding Leakage Of Aerospace Homopolar Alternators, Mulukutla S. Sarma
Sarma Mulukutla
An accurate knowledge of the magnetic field distribution is of great importance in finding the best designs for electrical machinery. It is the purpose of this paper to present a new numerical method for the determination of three-dimensional flux distribution in the end zone of a high-speed aerospace homopolar alternator, and for the calculation of end leakage reactance. The new analysis is applied to an experimental 95 kVA, 115/200 V, 3400 Hz, 40,800 r/min, three-phase, wye-connected, homopolar alternator.