This work presents the Analytical Model(AM) of H-type linear permanent magnet eddy current brakes(H-type LPMECB). In the presented paper, firstly, the AM of the H-type LPMECB was established using the equivalent magnetic circuit method. Secondly, the braking performance of the H-type LPMECB was simulated with the Finite Element Model(FEM) and the AM, respectively. The AM performance results are consistent with those of the FEM, which validates the AM. Hereafter, the nonlinear relationship between the Iron Foils (IF) number of the H-type LPMECB and the braking force was found by the AM and the FEM, which provides a guide for the IF number selection in future work. Finally, the experimental results are in agreement with the results obtained from the simulations, which also proves the AM and the simulation results.

Multivariate Empirical Mode Decomposition (MEMD) is a powerful tool to analyze nonlinear properties but it is very computationally time-consuming. The purpose of this study is to parallelize and accelerate MEMD, and to apply the accelerated MEMD to the analysis of electromagnetic wave propagation in photonic crystals, to improve the efficiency of generation of a demultiplexer. In the proposed method, part of the procedures which do not depend on channels of input signal were parallelized. Speedup which is based on 24 threads of 5.12 times is achieved when 192 threads are adopted.

In this study, electromagnetic field simulation using the FDTD method is performed to reproduce the electromagnetic shielding effect, and frequency analysis using the Hilbert-Huang Transform (HHT) is performed on the obtained results. Fourier analysis is generally adopted when performing electromagnetic field frequency analysis. However, since Fourier analysis is a technique that decomposes signals linearly, it is difficult to fully analyze phenomena of nonlinear signals. On the other hand, HHT is an analysis method that decomposes signals into a nonlinear frequency components, so it can be said that it is an analysis method suitable for analysis of complex and nonlinear phenomena.

Spoke PM topology has been applied to the PM vernier machine to enhance the airgap flux density and the back EMF. However, the problem of magnetic potential oscillation is found in the isolated core pieces, which greatly limits the advantage of spoke PM vernier machines. Spoke PM vernier machine with alternate bridges is then adopted to avoid this problem. The alternate bridge has been proven effective, but the contribution is yet to be identified quantitatively. Therefore, this paper presents a more precise analytical equation to determine the role of alternate bridges. The analytically obtained results are verified through FEM simulations. Furthermore, using the obtained equations, the bridge can be designed properly.

The DC bias of a power transformer will increase the noise level and additional losses of the transformer. It thus is essential to calculate the transient electromagnetic fields of a power transformer under DC Bias. In this respect, the time period finite element method (TPFEM) is a feasible solution. However, the standard constant time step TPFEM will encounter deficiencies in solving a field problem with a sharp change occurring in a relatively small interval. In this point of view, an improved adaptive time step TPFEM is proposed and validated in this paper.

The conductor rod is a crucial component of a high-voltage casing, and any breakage can trigger line protection actions and result in significant economic losses. Therefore, this paper investigates the stress and deformation of the conductor rod in a 750kV HV casing under service conditions that consider creep characteristics. Firstly, a finite element model of the rod connector that considers creep characteristics is established. Secondly, stress and deformation tests of the rod connectors are conducted, considering the effect of creep characteristics. Lastly, the experimental results are compared with the simulation results to verify the accuracy of the simulation.

This paper explores the influence of rotor containment sleeves on the comprehensive performance of high-speed PM generator. In this respect, the electromagnetic loss and temperature fields distribution under different material fabricated sleeves are compared and analyzed by electromagnetic field and three dimensional coupled fluid-thermal field analysis. The numerical results show that a carbon fiber sleeve performs better than a copper-embedded composite one.

The application of a rotating magnetic field has been posited to contribute to the functionalization of materials. The quadrupole magnet previously developed, although functional, presents installation challenges for attached parts due to spatial restrictions, as it is enclosed on all four sides. To avoid these issues, we utilized a triple-pole magnet that affords larger space. A three-dimensional finite integration technique simulation was conducted to assess the alterations in magnetic orientations when a current was applied to each pole. It was observed that the magnetic directions could be steered to any angle within a 4 × 4 mm2 range. Moreover, the magnetic field strength can be kept constant by adjusting the maximum current value.

According to statistics, short circuit faults in transformer windings account for 70% to 80% of the total faults. Therefore, the study of the short circuit withstand capability of transformers holds significant importance. This paper focuses on investigating the winding deformation and short circuit strength of a 2kV/0.4kV/160kVA single-phase four-column transformer under secondary side load short circuit conditions. The influence of pads and struts offset on various aspects of windings is considered during the implementation. The paper presents the distributions of magnetic leakage field, current, winding deformation displacement, and electromagnetic forces under transformer short circuit conditions. This provides a novel approach for the verification of short circuit strength in large-scale transformer windings.

Several studies have implemented edge elements into meshless methods to suppress spurious solutions. However, all of these methods are subject to some limitations, which detract from the advantages of the meshless method. This study proposed a meshless method that implements the idea of edge elements but does not impose any restrictions on the nodal arrangement. Accuracy was also evaluated by adapting it to modal analysis.

The existing coil electromagnetic launcher such as coil guns are designed with tubular coil structures,which is inefficient in filling ammunition. In this paper, a continuously acceleration propulsion system based on opening electromagnetic launcher is proposed. The opening electromagnetic launcher with certain electromagnetic energy is obtained by "opening" the traditional spiral coil. On the basis of single-stage electromagnetic launcher, the segmented structure design of 90 mm multi-stage coil is carried out. Then, the electromagnetic launcher motion model is established to analyze the force and motion speed of the projectile during the motion. Finally, its feasibility is verified by simulation.

The 3-D stray loss of the upgraded TEAM P21e with the two-sided excitation (ADH2) under the harmonic and DC-biased magnetization is analyzed by the 3-D fixed-point harmonic-balanced finite element method considering the anisotropic properties. First, the measured results of the leakage flux density and the stray loss obtained by the TEAM P21e experiment platform are compared to the calculated results for validation and characteristic analysis. Then, the efficiency of the harmonic-balanced method with parallel computing is analyzed in detail.

The mechanical properties of transformer winding components have an important influence on the winding deformation during short circuit. In this paper, an analysis method of winding dynamic deformation under different working conditions of transformer considering the influence of different pre-pressure and pressing force on the mechanical characteristics of winding components is proposed. The relationship between elastic modulus, yield strength, displacement and fracture times of winding components and different pre-pressure and pressing force was tested by universal material testing machine. Using this method, the instantaneous dynamic response of the deformation of the winding component of the 750kV power transformer under different working conditions is obtained, including the short-circuit dynamic force, displacement and stress of the winding component.

Recently, ultra-compact electric vehicles (EVs) are beginning to replace general vehicles installed with gasoline engines. However, the outer plate of an ultra-compact EV has low rigidity; hence road and wind noise is transmitted to the inside of the vehicle. Therefore, we propose an active noise control (ANC) system using wall vibration generated by a giant magnetostrictive actuator (GMA). In this study, we developed a model of the GMA and analyzed, by electromagnetic field analysis, output performance due to differences in properties of the GMA material.