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Full-Text Articles in Engineering
Digital Computer Simulation Of Electromagnetic Field Problems As Applied To The Design Of Electrical Machinery, K. S. Demirchian, V. V. Dombrovski, V. L. Chechurin, M. Sarma
Digital Computer Simulation Of Electromagnetic Field Problems As Applied To The Design Of Electrical Machinery, K. S. Demirchian, V. V. Dombrovski, V. L. Chechurin, M. Sarma
Sarma Mulukutla
The problem of electromagnetic field calculation in the end-zone of electrical machines is considered in this paper. A three-dimensional field requires using new methods of computing because the existing methods with the concept of vector potential demand unacceptable computer time. The new method consists of replacing the eddy magnetic field by the potential field of magnetic charges for the calculation of field, forces and associated inductances. Electrical currents of the rotor and stator windings are replaced by magnetic charges. it is possible to use just one scalar potential function for the computation instead of three components of the vector potential. …
Computing Models For The Magnetic Field Calculation Of Superconducting Electric Machines With The Help Of Scalar Magnetic Potential, V. L. Chechurin, M. Sarma
Computing Models For The Magnetic Field Calculation Of Superconducting Electric Machines With The Help Of Scalar Magnetic Potential, V. L. Chechurin, M. Sarma
Sarma Mulukutla
The method of scalar magnetic potential using imaginary magnetic charges is employed effectively for the calculation of the electromagnetic fields in superconducting electric machines. The computing model consists of several single layers of magnetic charges. Finite-difference numerical techniques are utilized for the computation. The cylindrical coordinate system has been used for the calculation of the electromagnetic losses inside the electromagnetic shield of the rotor winding. The tangential and axial components of eddy currents have been taken into account. Linear magnetic charges replace rotor and stator currents; and surface magnetic charges replace the eddy currents inside the electromagnetic shield of the …
Scalar Potential Concept For Calculating The Steady Magnetic Fields And Eddy Currents, Kamo Demirchian, Vladimir Chechurin, Mulukutla Sarma
Scalar Potential Concept For Calculating The Steady Magnetic Fields And Eddy Currents, Kamo Demirchian, Vladimir Chechurin, Mulukutla Sarma
Sarma Mulukutla
The concept of scalar potential has been used for magnetic field calculation in the USSR during the last decade. It is based on treating the eddy component of the magnetic field separately and calculating the potential field with the help of the scalar potential by introducing imaginary magnetic charges. This method has been developed for digital calculations of magnetic fields in various electromagnetic devices, by solving linear and nonlinear partial-differential equations through mathematical simulation. This paper presents the mathematical formulation of the method. It is advantageous to use the scalar potential method for two-dimensional eddy-current calculations because of the possibility …
Current-Density Distribution In Solid-Rotor Induction Motor, Mulukutla S. Sarma
Current-Density Distribution In Solid-Rotor Induction Motor, Mulukutla S. Sarma
Sarma Mulukutla
The interaction between the eddy currents induced in the solid cylindrical rotor steel structure and the revolving field of the airgap produces the electrodynamic torque. The polyphase induction machine with solid-iron rotor offers advantages in ease of manufacture, in high torque per ampere at standstill, in withstanding high rotational stresses, and in operating in unusual environments. It is the purpose of this paper to present an approximate three-dimensional nonlinear numerical analysis of the solid-rotor induction motor for finding the three-dimensional current-density distribution in the solid rotor, in order to calculate the performance characteristics, based on finite-difference iterative techniques.
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 …