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This study deals with the analysis of electro-mechanical characteristic analysis on permanent magnet synchronous machines (PMSMs) for electrically driven tools primarily used in industrial applications. This study compares the noise, vibration, and harshness (NVH) characteristic results generated by fractional pole/slot combinations. The electromagnetic (EM) analysis results of the PMSMs are derived using the finite element method (FEM), and the NVH analysis is performed by applying the EM analysis results. The analysis results and the effects of EM characteristics on the vibration of the PMSMs were analyzed. The effects of EM excitation characteristics on the rotor vibrations in the PMSM were compared and analyzed. [ABSTRACT FROM AUTHOR]

This paper proposes an electromagnetic analysis using an analytical method for a permanent magnet synchronous generator (PMSG) in a wave energy converter. To prevent the scattering of the rotor magnet of the PMSG with a wide operating range, bolting to the permanent magnet is required, and the analytical solution is calculated by simplifying it to two analytical models. Based on the electromagnetic theory, the analytical solution of each analytical domain is derived. The electromagnetic parameters are derived from the analytical solution and are calculated using the principle of superposition. The validity of the proposed analytical results is verified by comparing nonlinear 2-D and 3-D finite-element analysis with experimental results. [ABSTRACT FROM AUTHOR]

In this paper, the electromagnetic performance and operating characteristics of magnetic-geared permanent-magnet machines (MGPMMs) are evaluated using the subdomain analytical method. We derive the governing equations for each region based on the electromagnetic theory and some assumptions. The undetermined coefficients of the governing equations are calculated using boundary conditions. Based on the analytical solutions, the electromagnetic performance is analyzed. The proposed analytical method is validated through the nonlinear finite-element method and an experiment. In particular, an analysis of the performance analysis of the slot combination, which is one of the design variables, suggests the increased power factor and operating range. The analytical method can be useful for the initial and optimal designs of MGPMMs. [ABSTRACT FROM AUTHOR]

This paper presents the analytical modeling and experimental study for electromagnetic analysis of tubular linear synchronous machines with axially magnetized permanent magnets, accounting for the flux-passing iron pole. The field domains are divided into five regions: air gap (I, III), coreless winding (II), outer magnet mover (i), and nonmagnetic material (IV). The governing equation in all subdomains can be solved, and the field distribution can be obtained by applying the boundary conditions to the interfaces between the subdomains. The analytical solutions allow for the prediction of the back electromotive force, inductance, and generating characteristics in closed forms. The magnetic field and electromagnetic performance obtained by the analytical method were compared with those obtained by the finite element method and experimental test. In turn, these facilitate the characterization of the machines and provide a basis for comparative studies, design optimization, system dynamic modeling and simulations, and control development. [ABSTRACT FROM AUTHOR]

This paper proposes an analytical technique for calculating the armature reaction field and inductance of permanent magnet linear synchronous machines based on a subdomain analytical model. The analytical solutions based on the subdomain model in terms of a 2-D Cartesian coordinate system are obtained using continuous and Neumann boundary conditions. The analytical results of the magnetic field are validated extensively with finite element method (FEM). Based on these solutions, the inductance is also determined analytically. In addition, we improve the accuracy of the analysis by using a simplified method of calculating the end inductance. Finally, the predictions are compared with a 3-D FEM and measured data to confirm the validity of the analysis methods presented in this paper. [ABSTRACT FROM AUTHOR]

This paper reports on the analysis of eddy-current loss of a magnetic coupling (MC) that uses a Halbach array permanent magnet (PM). A MC is a kind of noncontact magnetic device (NCMD). When the conductive materials of NCMDs are exposed to time-varying magnetic fields, eddy currents are induced in the conductive materials, leading to losses. An analysis of the eddy-current loss is therefore required, and for MCs, the analysis of eddy-current loss is particularly more important. We obtain the magnetic field solutions of the Halbach magnetized PM based on the magnetic vector potential and 2-D polar-coordinate system. In addition, using the derived magnetic field solutions, we derive analytical solutions for eddy-current loss using the equivalent electrical resistance that is calculated from the magnet volume and conductivity. A 2-D finite-element analysis is employed to confirm the validity of the analytical results of the eddy-current density and eddy-current loss. Finally, we investigate the influence of the number of Halbach segments on the eddy-current loss induced on the MC. [ABSTRACT FROM AUTHOR]

This paper deals with the dynamic characteristics of a linear induction motor (LIM) in terms of acceleration times and jerk conditions. We employed Matlab Simulink for conducting simulations of the dynamic modeling of LIM operated by a space vector pulse width modulation inverter. From the simulation results, the maximum load conditions and minimum acceleration times to guarantee passengers' safety were determined. Further, the electromagnetic field theory was employed to derive equivalent circuit parameters, and the results were validated by the finite element method. The analysis model was applied to a magnetic levitation vehicle for providing electromagnetic propulsion force, and its dynamic characteristics were analyzed to predict its operating performance; moreover, experimental results were employed to demonstrate the validity. We believe that the proposed prediction technique for the operating characteristics of LIMs can contribute to improving passengers' safety and riding quality. [ABSTRACT FROM AUTHOR]