COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 38 Issue 4

Guest editorial

Scaling algorithms in modelling of power loss in soft magnetic composites

The purpose of this paper is to examine scaling algorithms in the description and modelling of power loss in soft magnetic composites (SMCs).

Continuous local material model for the mechanical stress-dependency of magnetic properties in non-oriented electrical steel

Magnetic properties of electrical steel are affected by mechanical stress. In electrical machines, influences because of manufacturing and assembling and because of operation…

Mechanical stress distribution and the utilisation of the magneto-elastic effect in electrical machines

Due to the increasing amount of high power density high-speed electrical machines, a detailed understanding of the consequences for the machine’s operational behaviour and…

Improving electrospinning process by numerical analysis of 3-D computer models

Electrospinning is a method of the polymer super thin fibres formation by the electrostatic field. The distribution of electrostatic field affects the effectiveness of the…

Comparison of the reluctance laminated and solid rotor synchronous machine operating at high temperatures

The purpose of this paper is to present a comparison between reluctance synchronous machine-enabling work at high internal temperature (HT° machine) with laminated and solid rotor.

FE analysis of coupled electromagnetic-thermal phenomena in the squirrel cage motor working at high ambient temperature

This paper aims to elaborate the method and algorithm for the analysis of the influence of high temperature on electric and thermal properties of the materials, as well as thermal…

A volume integral approach for the modelling and design of HTS coils

The purpose of this paper is to develop a rapid and realistic modelling approach for the design and characterization of high temperature superconducting (HTS) coils and windings…

High-frequency displacement current transformer with just one winding

This paper aims to describe a new concept of transformer based on the displacement current. The paper shows how this idea can be translated into reality and presents an example of…

Modelling the effect of compaction pressure on hysteresis curves of self-developed SMC cores

The purpose of this paper is to examine the effect of varying compaction pressure on magnetic properties of self-developed soft magnetic composite (SMC) cores. The change in shape…

SDRE-based high performance feedback control for nonlinear mechatronic systems

The purpose of the paper is to present modeling and control of a nonlinear mechatronic system. To solve the control problem, the modified state-dependent Riccati equation (SDRE…

Analysis of axial flux permanent magnet generator

The purpose of this paper is to compare the methods of calculating the parameters of air-cored stator flux permanent magnet generator and to compare these results with the…

Nonlinear magnetic equivalent circuit of the hybrid magnetic bearing

The purpose of this paper is to create a reliable nonlinear magnetic equivalent circuit (NMEC) of the hybrid magnetic bearing (HMB). Commonly used magnetic equivalent circuits of…

LSTM multichannel neural networks in mental task classification

The purpose of this paper is to apply recurrent neural networks (RNNs) and more specifically long-short term memory (LSTM)-based ones for mental task classification in terms of…

Modern methods to monitor end winding vibrations in turbo-generators

Problems caused by end winding vibrations in power plant generators have become increasingly evident in recent years and reveal a need for monitoring and diagnostic systems. An…

Iron loss simulation using a local material model

The cutting process of the electric machine laminations causes residual mechanical stress in the soft magnetic material. A local magnetic deterioration can be observed and the…

Influence of shape and material of rotor bars on performance characteristics of single-phase self-excited induction generators

The purpose of the paper is to present an analysis of an influence of shape and material of rotor bars on the process of self-excitation and performance characteristics of…

Diamond enriched lamination and winding insulation for electrical machines

The thermal management of electrical insulations poses a challenge in electrical devices as electrical insulators are also thermal insulators. Diamond is the best solid electrical…

Design of an induction machine with damper windings for noise and vibrations reduction

The purpose of this paper is to present a design method for induction machines including a three-phase damper winding for noise and vibrations reduction.

Calculations of eddy currents in electrical steel sheets taking into account their magnetic hysteresis

The purpose of this paper is to present the method which relatively easily allows to approximate the hysteresis loop of the dynamo or transformer steel sheets. The paper also…

GLIDARC reactor power supply with ignition improvement

The research purpose of this paper is to confirm that internal overvoltages in the push–pull power inverter can be used to improve the discharge ignition in the gliding arc…

Adaptation of the penalty function method to genetic algorithm in electromagnetic devices designing

The purpose of this paper is to elaborate the effective method of adaptation of the external penalty function to the genetic algorithm.

Practical model of the axial magnetic field in the end region of large turbo-generators

The axial magnetic field occurs in the end-region of large turbo-generators is known to induce hot points or voltages between laminations, that may cause insulation breakdown and…

Analysis of axial flux motor performance for traction motor applications

Analysis of test data monitored for a number of electric machines from the low volume production line can lead to useful conclusions. The purpose of this paper is to trace the…

The wide range of output frequency regulation method for the inverter using the combination of PWM and DDS

The specific modulation methods are used to control different kind of single-phase, as well as three-phase, inverters to ensure flexibility and high quality of the output…

Approximation of complex organic tissue for investigation of the electromagnetic impact

The purpose of this paper is to study the performance of the approximated model of biological tissue for development of complex 3 D models. The comparison of results from the…

Evaluation of the usability of the Canay’s equivalent circuit diagrams for the calculation of subsynchronous resonances

In the shaft and end windings of large turbogenerators, unacceptably high mechanical stresses can occur as a result of subsynchronous resonances (SSRs) in the system…

Induction-assisted laser welding taking into account phase changes

The paper aims to describe the modeling of the induction-assisted laser welding process taking into account the keyhole effect and phase changes in the material.