Electromagnetic fields and thrust-ripples calculation for segmented-secondary linear flux-switching motors

2019 ◽  
Vol 38 (1) ◽  
pp. 95-118
Author(s):  
Monir Sadat Hosseini ◽  
Hamid Javadi ◽  
Sadegh Vaez-Zadeh
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Field Distribution ◽  
Low Cost ◽  
Transportation Systems ◽  
Analytical Models ◽  
Force Density ◽  
Two Dimensional ◽  
Content Type ◽  
Electromagnetic Field Distribution

Purpose This paper aims to investigate analytical electromagnetic fields and thrust ripples representation of linear flux-switching motors with simple modulated secondary referred as segmented secondary linear flux-switching motor (SSLFSM). Design/methodology/approach SSLFSMs are applicable to transportation systems like Maglev due to their simple and consequently low-cost secondary structures and high force density. However, they have high thrust ripples that deteriorate a smooth motion in rail transportation systems. Therefore, derivation of accurate analytical models for thrust ripples minimization of the motor is essential, which is absent in the literature. In this paper, a two-dimensional analytical model is developed for this motor. The model is based on transfer relations and Fourier theory used for solving a two-dimensional boundary value problem. Certain model regions are determined by considering actual machine structure and observing specific rules. Analytical solution of Maxwell and Poison equations are then obtained in the regions. Finding Using the presented modeling method, the airgap electromagnetic field distribution and developed thrust of the motor are calculated for different positions of the motor as well as its thrust ripples. They are verified by the results obtained from finite element method. Also, the analytical results are compared with the presented experimental results. Originality/value This paper has analytically presented the airgap electromagnetic field distribution, thrust and thrust ripples of the SSLFSMs. This modeling is essential in thrust ripples minimization of the motor.

Numerical verification of Turowski’s coefficient

2016 ◽  
Vol 35 (6) ◽  
pp. 1965-1972
Author(s):  
Hugo Rodriguez-Ignacio ◽  
Xose M. Lopez-Fernandez
Keyword(s):  
Electromagnetic Field ◽  
Field Distribution ◽  
Hybrid Methods ◽  
Analytical Calculation ◽  
Magnetic Surface ◽  
Numerical Verification ◽  
Content Type ◽  
Electromagnetic Field Distribution ◽  
Hybrid Approaches ◽  
Current Conductor

Purpose The purpose of this paper is the numerical verification of the linearization coefficient ap proposed by Turowski for the calculation of the electromagnetic field distribution and therefore the stray losses inside magnetically saturated solid steel conductors. Design/methodology/approach The numerical verification is performed on a case study consisting of a simple current conductor sheet parallel to a solid steel plate. Numerical computations are compared with analytical calculations with and without inclusion of the semi-empirical Turowski’s coefficient. Findings Results confirm a good agreement between numerical values for steel with non-linear permeability and analytical ones applying Turowski’s coefficient. This is particularly powerful in the case of analytical calculation of the magnetic surface impedance (SI) to increase precision when hybrid methods are used. The concept of SI enables the establishment of hybrid approaches for the calculation of stray losses, combining the numerical methods (finite difference method, finite element method (FEM), etc.) together with the analytical formulation, gaining from the advantages of both methods. Originality/value Previous numerical analysis was focused on the field dependence on time for several depths inside solid steel. The aim of this paper is to investigate the electromagnetic field distribution inside solid steel on a representative FEM model and verify how the linearization coefficient ap proposed by Turowski works.

Analysis of Two-Dimensional and Three-Dimensional Simulation of the Disc Eddy Current Braking Device

2012 ◽  
Vol 516-517 ◽  
pp. 553-557
Author(s):  
Zhi Ding Ying ◽  
Yu Long Fang ◽  
Xin Fu Xu ◽  
Wei Sun ◽  
Yang Chu
Keyword(s):  
Mathematical Model ◽  
Electromagnetic Field ◽  
Field Distribution ◽  
Eddy Current ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Electromagnetic Field Distribution ◽  
Braking Torque ◽  
Dimensional Simulation

To analyze the variation of electromagnetic field distribution, a mathematical model of the eddy current brake (ECB) is established and the two-dimensional simulation and three-dimensional simulation are comparatively analyzed. Then the curves of the braking torque of the ECB at different speeds are obtained by the simulations. The characteristics of two-dimensional and three-dimensional simulation of the electromagnetic field of the ECB are summarized by contrasted comparative curves between simulation date and test date. The analysis is helpful to optimizing the application of electromagnetism by using software.

scholarly journals Features of field modeling of electromagnetic processes of trolley busbar

2021 ◽  
pp. 46-60
Author(s):  
М.І. Kotsur ◽  
D.S. Yarymbash ◽  
Yu.S. Bezverkhnya ◽  
T.Yu. Divchuk
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Field Distribution ◽  
Spatial Model ◽  
High Accuracy ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Electromagnetic Field Distribution ◽  
Electromagnetic Processes ◽  
Two Dimensional Model

Purpose. Research and analysis trolley busbar’s parameters in condition of higher current harmonic actions, with taking into account the structural features of nonlinearity of magnetic and electrical properties of materials, proximity effects, surface and external surface effects. Methodology. The researches were carried out using the electromagnetic field theory methods, the electrical circuit theory, mathematical physics, finite elements, interpolation, approximation and regression analysis. Findings. The mathematical spatial model of electromagnetic processes in a steel trolley busbar in time statement of a problem of distribution of an electromagnetic field is developed. The dependences of the distribution of equipotential lines of the resulting z-component of the magnetic potential vector along the busbar, as well as the distribution of the resulting normal component of magnetic induction and magnetic field strength in the transverse (XY) cross section at non-sinusoidal current in busbar trolleys is obtained. Along the length of the busbar, in their cross section, the magnetic field tends to a plane-parallel shape it is proved. The error of the modulus of the vector magnetic potential along the length of the busbar does not exceed 0.9-1.2%. To reduce the dimension of the problem, computational resources and calculation time, a two-dimensional plane-parallel mathematical model in the frequency setting of the electromagnetic field distribution is proposed. To take into account the nonlinear magnetic properties of steel trolleys, to determine the effective magnetization curve for the nonlinear two-dimensional problem of the electromagnetic field of the busbar it is proposed. The verification results, according to the calculated voltage drop, confirm the high accuracy of the calculation and the reliability of the obtained results (error does not exceed 1.88% ÷ 2.06%) of the two-dimensional model in the frequency setting relative to the spatial model in the problem of time-dependent electrical -magnetic field is obtained. Originality. A mathematical two-dimensional model of electromagnetic processes in the frequency formulation of the problem of electromagnetic field distribution in a trolley busbar is proposed, which takes into account design features, nonlinearity of magnetic and electrophysical properties of materials, proximity effects, surface and external surface effects, influence of harmonic current components power transmission, which allows with high accuracy and efficiency of numerical implementation to determine the parameters of the bus trolls for the corresponding values of the amplitudes and frequencies of the frequencies harmonics of the current. Practical value. Verification of the calculated voltage drop confirms the high accuracy of the calculation and the reliability of the results (error does not exceed 1.88% ÷ 2.06%) of the two-dimensional model in the frequency reference relative to the spatial model in the problem of time-dependent electromagnetic field distribution is performed.

Design and comparison of two kinds of primary wound field flux-switching linear motors

2018 ◽  
Vol 37 (1) ◽  
pp. 333-356 ◽  
Author(s):  
Ruiwu Cao ◽  
Yi Jin ◽  
Yanze Zhang ◽  
Ming Cheng
Keyword(s):  
Low Cost ◽  
Force Production ◽  
Transportation Systems ◽  
Force Density ◽  
Flux Analysis ◽  
Rail Transportation ◽  
Production Mechanism ◽  
Design Rules ◽  
Content Type ◽  
Complementary Design

Purpose The purpose of this paper is to propose the complementary design rules, give a quantitative comparison and analyze the force production mechanism of two kinds of primary wound field flux-switching linear (PWFFSL) motors. Design/methodology/approach PWFFSL motors have the merits of no use of rare-earth magnet, low cost and a wide operation range in which the armature windings and the field windings are all located at the short primary mover and the secondary is very robust. Hence, the PWFFSL motor is ideal for rail transportation systems which need a long stator and a wide speed range. To overcome the disadvantages of the existing PWFFSL motors, new complementary design rules will be proposed. Also, to offer a better PWFFSL motor for the rail transportation systems, it is necessary to investigate different structures of PWFFSL motors and give a comprehensive comparison. To predict the force performance of two kinds of PWFFSL motors with different secondary types, their flux density analysis and force production mechanism will be presented and compared. Findings The comparison result shows that the PWFFSL motor with toothed secondary can offer larger thrust force, higher force density and higher efficiency, whereas the PWFFSL motor with segmented secondary has the merits of lower force ripple, less use of stator iron, higher power factor and less critical saturation. Research limitations/implications Many PWFFSL motors with different primary/secondary pole pitches based on the proposed design principle have not been considered in this paper. Originality/value This paper has presented the air-gap flux analysis, proposed the complementary design rules for two kinds of PWFFSL motors with different secondary types and compared the electromagnetic performance of the two motors.

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