International Journal of Applied Electromagnetics and Mechanics - Volume 60, issue 3

Authors: Rauf, Muhammad | Khan, Abid Muhammad | Ansari, Adeel | Jilani, Muhammad Taha | Shahzeb, Taha

Article Type: Research Article

Abstract: Marine controlled-source electromagnetic method (MCSEM) for seabed logging (SBL) uses a dipole source to generate low-frequency signals, and arrays of receivers to map the potential presence of hydrocarbon reservoirs. The characteristic depth of signal penetration in the subsurface, termed as skin depth, is one of the key parameters. However, the electromagnetic response by the resistive target in contrast to the skin depth evaluation has been less thoroughly documented. In this paper, a lab scale testing is performed to generate a data set with precisely scaled dimensions. The purpose is to verify the skin depth phenomenon in complex stratified mediums for …hydrocarbon detection. The synthetic electromagnetic data is produced using 1D modeling to validate the experimental results. The calculated correlation coefficient (CC) of more than 0.9 showed a good agreement between experimental and synthetic response. This outcome reveals that the depth of hydrocarbon detection does not solely depend on the skin depth of the applied frequency. The validated results recommend that a broadband electromagnetic transmitting system may reveal more authentic information about the hydrocarbon presence and extent of the hydrocarbon prospects. Show more

Keywords: Controlled-source electromagnetic methods, skin depth, electrode-based transmitter, 1D forward modeling, electromagnetic simulation

DOI: 10.3233/JAE-180105

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 313-326, 2019

Authors: Yang, Xiaolong | Hao, Fuxiang | Xu, Wubin | Gao, Shanghan | Chen, Fan | Sun, Peng | Li, Decai

Article Type: Research Article

Abstract: The diverging stepped magnetic fluid seal based on stepped labyrinth seal was an effective method to improve the capability of usual magnetic fluid seal with large gap. Pressure theory of the diverging stepped magnetic fluid seal was presented and a diverging magnetic fluid sealing with two magnetic sources was designed. The leakage location hypothesis in the diverging stepped magnetic fluid seal has been made. The magnetic field distributions in the radial and axial sealing gaps have been calculated by means of the finite element method of magnetic field and its maximum sealing capabilities have been calculated based on its pressure …theory. The effects of radial and axial sealing gaps on the diverging stepped magnetic fluid seal have been obtained. The numerical and experimental results were analyzed and discussed. The results show that the theoretical pressure-resistant capabilities of the diverging stepped magnetic fluid seal with two magnetic sources agree well with its experimental pressure-resistant capabilities. The leakage path in the axial sealing gap located at its center position and the leakage path in the radial sealing gap located in the vicinity of the shaft. Show more

Keywords: Large gap, magnetic fluid, numerical simulation, seal, stepped shaft

DOI: 10.3233/JAE-180097

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 327-335, 2019

Authors: Shi, Tingna | Zhang, Yangshengmei | Guo, Liyan | Wang, Huimin | Xia, Changliang

Article Type: Research Article

Abstract: Interior permanent magnet machine has been widely used in electric vehicles due to its high-power density and good flux weakening performance. This paper firstly introduces the principle of flux-weakening control, which are the foundation to describe the effect of d -axis inductance and q -axis inductance on the speed range of motor. Secondly, regarding an interior permanent magnet synchronous motor with V -type permanent magnet structure as the research object, an improved rotor structure has been proposed which concludes asymmetric segmentations of permanent magnets and protuberances from centers of every magnetic poles toward airgap. Furthermore, the Taguchi method is …utilized to optimize the proposed improved structure. Finally, the optimized rotor structure which meet the requirement of d -axis inductance, q -axis inductance and electromagnetic torque has been obtained. Compared with the initial structure, the optimized rotor structure can increase d -axis inductance effectively, and hence broaden the speed range with constant power operation. Show more

Keywords: Speed range, interior permanent magnet synchronous machine, inductance, Taguchi method

DOI: 10.3233/JAE-180090

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 337-353, 2019

Authors: Hui, Sun | Chunni, Fang | Long, Zhang | Gongxian, Wang

Article Type: Research Article

Abstract: This paper presents a new design of cycloid corrugated magnetorheological fluid (MR) coupling based on the magnetorheological shear-pressure mixing mode. The device optimizes the formation of the magnetic chain through an arcuate magnetically conductive surface and guides the magnetic circuit with a magnetic isolation ring, so that the mechanical characteristics of the magnetorheological fluid can be fully utilized to enhance the power torque transmission capability. After describing the structure, electromagnetic simulations were performed to verify the formation of magnetically sensitive lines on an arc-shaped surface. The metal rolling force calculation method based on Orowan unit pressure differential equation was used …to establish a mechanical mechanism model of a magnetorheological fluid coupling with cycloid corrugated surface. The key parameters affecting the torque transfer performance of the MR coupling were calculated through Matlab software, and the performance of the device was evaluated. After that, the experimental platform was set up to test its performance. The experiment results indicate that the proposed MR coupling performs better than the conventional MR coupling with conventional planes in terms of torque output capability, transmission stability, and impact resistance, while maintaining a feasible magnetic circuit design and a compact structure. Show more

Keywords: Magnetorheological fluid, coupling, cycloid, electromagnetic simulation, mechanism model

DOI: 10.3233/JAE-180045

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 355-377, 2019

Authors: Jin, Zhijia | Sun, Xiaodong | Yang, Zebin | Wang, Shaohua | Chen, Long | Li, Ke

Article Type: Research Article

Abstract: In this paper, a novel bearingless permanent magnet machine (BPMM) without strong and complex magnetic field coupling, which can limit four degree-of-freedoms (DOFs) independently, is presented for the flywheel energy storage system (FESS). The proposed machine provides suspension force by means of interaction of flux density between the permanent magnet rings and the winding current. Afterwards, the structure parameters have been designed and the model of the proposed machine is derived. Meanwhile, based on the conventional cross feedback control, the modified control scheme with compensation for cross channels is illustrated. Additionally, combining with the machine model and modified cross feedback …controller, the simulation is built to demonstrate the effectiveness. The results show the smaller fluctuation in steady state, fast response with disturbance and less impact on undisturbed channels by employing the modified control. Show more

Keywords: Bearingless permanent magnet machine, suspension force, structure design, finite element analysis, cross feedback control

DOI: 10.3233/JAE-180115

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 379-392, 2019

Authors: Liu, Gang | Jin, Zhiming | Zhao, Xiaojun | Yuan, Dongwei | Li, Lin

Article Type: Research Article

Abstract: The voltage on the valve side windings of the converter transformer is non-sinusoidal, which contains many high-order harmonic components. To calculate the nonlinear electric field distribution under the non-sinusoidal voltage, the harmonic-balanced decomposition finite element method (HBDFEM) is proposed in this paper. By using the fixed-point method, the finite element stiffness matrix of each iteration is decomposed according to the harmonic order, by which the memory consumption can be remarkably reduced. To verify the effectiveness of the proposed algorithm, a typical model of the oil-paper insulation structure is taken for instance, and the results obtained by the HBDFEM is compared …with two algorithms, the traditional HBFEM and the time step method. The calculation results show that the HBDFEM can effectively reduce the computation cost for the nonlinear electric field problems with the non-sinusoidal periodic voltage. And it can be applied to analyze the compound electric field problems of the actual converter transformer. The electric field distribution of a ±500 kV converter transformer is calculated and analyzed considering the nonlinear relationship between the electric field and the medium conductivity. Show more

Keywords: Converter transformer, fixed-point, finite element method, electric field, harmonic-balanced method

DOI: 10.3233/JAE-180080

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 393-407, 2019

Authors: Gao, Hui | Yu, Xiaohui | Cao, Jianan

Article Type: Research Article

Abstract: The structure of maglev flywheel battery is designed and the linear electromagnetic force is analyzed in his paper to study the beat phenomenon. Taylor expands the electromagnetic force to analyze the linearization and to build dynamic vibration model. To analyze the beat phenomenon of the maglev flywheel battery system, an accurate analytical model including controller effects and unbalance force effects is proposed. The general dynamic stiffness is defined and the unbalance response is analyzed in the model. Both the free vibration and the forced vibration are analyzed according to the model, and therefore the beat vibration is discovered. The influences …and weakening of the beat vibration are also discussed through adjusting the control currents and the inherent frequency. The simulation results and experimental results demonstrate the validity of the analysis. The accurate analytical model can provide simulation platform for the AMB system vibration compensation research. Show more

Keywords: Maglev flywheel, mechanical model, unbalance vibration, generalized dynamic stiffness, unbalance compensation

DOI: 10.3233/JAE-170154

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 409-421, 2019

Authors: Jin, Chaowu | Lv, Dongyuan | Yan, Xu | Xu, Yuanping | Xiong, Feng | Xu, Longxiang

Article Type: Research Article

Abstract: This paper proposes a novel eight-pole heteropolar radial-axial hybrid magnetic bearing (HMB) to reduce the power consumption and to improve the space utilization of the entire system. The mathematical model of HMB is obtained by applying the equivalent magnetic circuit method. And its bearing capacity in both the radial and axial directions is analyzed. Also, to maximize the bearing capacity, the structural parameters of HMB are designed. The magnetic field distribution and the magnetic induction intensity across the air gap are studied by the 3D Finite Element (FE) simulation. And the force/current and force/displacement characteristics are then attained. Experiments on …the investigated HMB are carried out to validate the modelling results. It has been shown that the maximum bearing capacity of the HMB is 190 N and 170 N in the radial and axial directions respectively, which are the 82.6% and 81% of theoretical value. Show more

Keywords: Hybrid magnetic bearing, permanent-magnet-biased, bearings capacity, equivalent magnetic circuit, combined radial-axial structure

DOI: 10.3233/JAE-180063

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 423-444, 2019

Authors: Han, Xiaoming | Liu, Zheng | Li, Guofeng | Wang, Zhen | Wu, Ziku | Wu, Yan

Article Type: Research Article

Abstract: This paper presents a Radial Basis Function (RBF) and Finite Element Method (FEM) hybrid approach to solve a 3-D electromagnetic problem. The proposed method divides the entire computational domain into a series of sub-domains. The shape functions of each sub-domain are obtained by point interpolation method based on RBF to improve fitting performance of FEM. Each sub-domain consists of Galerkin FEM elements in the entire computational domain. To validate the proposed method, a case study is carried out based on a dual-electrode DC arc furnace. The results demonstrate that RBF and FEM hybrid approach in this paper is superior to …the traditional FEM. Show more

Keywords: Finite element method, radial basis function, magnetic vector potential, three dimensional (3-D)

DOI: 10.3233/JAE-180059

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 445-455, 2019

Authors: Yan, Shiwei | Lei, Yu | Huang, Shangyu | Wang, Qiong | Zhou, Mengcheng | Hu, Jianhua | Zou, Fangli

Article Type: Research Article

Abstract: Electromagnetic compaction is a preferable high energy rate forming process for brazing powders to improve the brazing performance. The dynamic analysis of electromagnetic compaction of Ag-Cu-Sn multivariate mixed metal powders was conducted by an electromagnetic-mechanical-thermal coupled model and electromagnetic compaction tests. The coupled model consists of electrical circuit model, electromagnetic field model, kinematic model of driving board, thermal field model and powder compaction model, it can be used to make a complete dynamic analysis of the electromagnetic compaction including discharge current, eddy current, mutual interactions of magnetic fields, kinematic motion of driving board, compaction densification behaviors and the energy transfer. …The electromagnetic compaction tests of Ag-Cu-Sn multivariate mixed metal powders were carried out with a self-developed WG-IV electromagnetic forming machine. The electromagnetic-mechanical-thermal coupled model has good agreement with the electromagnetic compaction tests, and can provide a more accurate dynamic analysis and optimized process design of electromagnetic compaction. An optimization study for higher relative density was completed by the coupled model, and the brazing performance of the optimized brazing sheet with higher relative density was evaluated to be advantageous in the brazing performance tests. Show more

Keywords: Electromagnetic compaction, dynamic model, optimization study, brazing performance

DOI: 10.3233/JAE-180021

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 457-476, 2019

Authors: Zheng, Li | Qing, Chen | Yu, Xiao | Dixin, Wang | Leiyong, Wang | Qunjing, Wang

Article Type: Correction

DOI: 10.3233/JAE-189064

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. 3, pp. 477-477, 2019