D. Schieber

Asynchronous performance of hysteresis motor

Abstract A simplified model of the hysteresis motor is introduced and analyzed; field analysis is undertaken at hand of Maxwells stress tensor and Poyntings theorem. The suggested approach provides deeper insight into the power interchange process between stator and rotor.

Electrodynamics of solid-rotor induction machines

Abstract In this paper a simplified model of the solid-rotor induction machine is discussed. Analysis is provided on the basis of Maxwells equations yielding a dimensionless thrust-slip characteristic which permits rapid evaluation of various machine parameters in its performance. The salient feature of this kind of induction device—flat thrust-slip response—is borne out by the obtained curves.

Radiation pressure on a moving resistive sheet

Abstract The paper considers the effect of radiation pressure acting upon a moving, resistive sheet; the analysis is specifically concerned with the drag and levitation forces resulting when the sheet attains velocities approaching the velocity of a plane wave of light in vacuum. Relevant graphical results are presented.

On electromagnetic wave propagation inside moving nonmagnetic media

Abstract The paper deals with the mechanism of energy conversion between traveling electromagnetic waves and moving media; the results are of significance to the understanding of dielectric machines.

A.C.-induced Eddy currents

Abstract In many technical devices an a.c.-supplied “primary” magnetic field induces eddy-current flow in a “secondary” armature. Exact calculation of the overall field distribution is difficult, hence, the secondary field is often neglected in practice and only an estimate of the interaction is obtained. This paper outlines a general solution of the problem with both fields taken into account, and the specific model discussed shows how to proceed in more complicated cases.

Heating effects through unipolar induction

Abstract Energy conversion through unipolar induction is investigated; mechanical energy is directly transformed into heat and the underlying conversion process is analyzed here with the aid of two inertial frames of reference, one attached to the permanent magnet and the other to the moving, induced body. Poyntings theorem is used throughout and its relevance to the problem considered is stressed.

Electrodynamics of synchronous and asynchronous interactions

Abstract The electrodynamic processes underlying both types of interactions are considered; the field problem is formulated at hand of a simplified machine model and results, normally derived in terms of lumped parameters, are directly obtained from Maxwells equations, thus lending a deeper and more basic meaning to the relevant formulae

Charge excitation through electric influence

Abstract This paper investigates the transient build-up of an electric charge on an extended plane conductor, induced by a step function of charge in its proximity. The problem is of practical importance in its relevance to the understanding of electrostatic shielding, while from a theoretical point of view, its solution demonstrates the mechanism of electrical influence. A model is put forward, and results are quoted in closed-form representation.

Some Remarks on Electrostatic Influence Machines

Abstract A simplified model of an influence generator is put forward. The model is analysed by means of a conformal transformation and the output current is determined. Its high harmonic content is traced to the inherent geometry of the device.

Some remarks on inductive and capacitive diathermy

Abstract A simple field analysis for capacitive and inductive heating is presented. Although the models are highly idealized so as to yield a closed-form solution, the difference between the two forms of heating is clearly evident based on the graphic as well as the analytic results given.