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Analytical models are powerful tools in the preliminary design of electric machines. In this study, a flux‐tube model is proposed for switched reluctance machines, in which all the flux paths and the corresponding elements are accurately calculated, iron saturation is intelligently taken into account and formulas are generally developed to attain a continuous model for any range of design parameters. The inductances, flux linkages, torque–angle, maximum torque–current, mean torque–current characteristics are extracted. The special structure of the developed model enables us to extract the air‐gap flux density distribution of the machine. Also, finite‐element analysis is used in the analyses and evaluation of the model. Finally, the machine has been prototyped by which torque–angle curve and open‐loop characteristics are obtained experimentally to evaluate the model. Superiorities of the proposed framework over the previous approaches are demonstrated as well. [ABSTRACT FROM AUTHOR]

Analytical calculations are effective in preliminary design stages and analysis of electric machines. In this paper, for axial-flux interior permanent-magnet (PM) eddy-current couplers, an analytical model is developed, which is able to deal with the complex machine geometry and take into account material properties such as iron saturation and PM characteristics. The design considerations of the machine are also presented. Moreover, the studied structure shows several advantages in terms of mechanical and magnetic performances over the couplers with surface PMs. The three-dimensional (3-D) finite-element method is employed in the analyses and evaluations. Finally, an experimental prototype is built to validate the model. [ABSTRACT FROM PUBLISHER]

Analytical models play an important role in the design of electromagnetic devices by providing computationally efficient solutions. In this paper, by combining magnetic equivalent circuit approaches and Faraday's and Ampere's laws, a model for radial-flux eddy-current couplers is developed, which can easily handle complex geometries as well as account for iron saturation, all material properties, and three-dimensional (3-D) parameters. The characteristics and the design considerations of a surface-mounted permanent-magnet structure are presented. Also, a procedure aimed at an optimal design of the yoke thicknesses is utilized. Moreover, 2-D and 3-D finite-element methods are employed in the analyses and evaluation of the model. Finally, sensitivity analysis is performed to explore the impacts of the machine parameters on the device performance. [ABSTRACT FROM AUTHOR]

Analytical models have been demonstrated to be effective tools in the analysis of electromagnetic devices by providing fast, yet accurate solutions. In this paper, a comprehensive analytical framework for double-rotor radial-flux air-cored permanent-magnet (PM) machines is developed whereby the average as well as the torque ripples, back-electromotive force (EMF) waveforms, air-gap flux density distribution, and a number of other characteristics regarding the design of the machine are predicted. Also, closed-form expressions for inductances of the stator coils are analytically derived. All machine parameters and material properties including iron saturation are considered in the model. Moreover, an algorithm in order to optimally design the thicknesses of the rotor yokes based on the utilized steel is presented. Finally, genetic optimizations regarding the enhancement of the produced torque and back-EMF are performed. It is also shown that the results obtained from the proposed model match well with those issued from finite element method. [ABSTRACT FROM PUBLISHER]