International Journal of Applied Electromagnetics and Mechanics - Volume Pre-press, issue Pre-press

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. Pre-press, no. Pre-press, pp. 1-13, 2019

Authors: Lahyaoui, Otmane | Lanfranchi, Vincent | Buiron, Nicolas | Martin, Floran | Aydin, Ugur | Belahcen, Anouar

Article Type: Research Article

Abstract: Soft ferromagnetic materials constitute the main components of magnetic circuits in electromechanical devices. However, their magnetic and magnetostrictive properties are strongly affected by mechanical loading. This can lead to a decrease in the performance and the efficiency of these devices and to a potential increase of the emitted noise. Aware of the importance of these factors, this paper proposes to study the effect of the mechanical stress on the magnetic and magneto-elastic properties of non-oriented electrical steel sheets. The stress dependency of permeability and Villari effect has been studied. Measurements of the magnetostrictive strain under applied stress are presented and …the anisotropic behavior under stress is described. Moreover, the ΔE effect has been observed and analyzed. The novelty of this work is the extension of the measurements to many directions of cut with respect to the rolling direction under tensile and compressive stress, as well as the demonstration of the magnetic and magnetostrictive anisotropy under uniaxial stress. Show more

Keywords: Magnetostriction, magnetization, mechanical stress, magneto-elastic effect, non-oriented electrical steel, magnetic material, anisotropy

DOI: 10.3233/JAE-180106

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-14, 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. Pre-press, no. Pre-press, pp. 1-15, 2019

Authors: Shao, Yan | Xu, Minglong | Song, Siyang | Tian, Zheng | Shao, Shubao

Article Type: Research Article

Abstract: Inertial piezoelectric rotary actuators have been driving interests of researchers major in precision machining and precision positioning. It has great significances to model inertial driving principle more accurately and design rotary actuators with simpler structure and higher resolution. In this paper, an inertial rotary actuator with one piezoelectric element is proposed. The theoretical development and experiments of the actuator are presented. The verification of developed model proves that the model has great potentials on designing and optimizing the stick-slip rotary actuators. The experimental test of the actuator shows that stepping characteristic depends greatly on the input voltage parameters and the …frictional force. This designed rotary actuator achieves the minimum resolution of 0.58 μrad with simple configuration. Show more

Keywords: Micropositioning, piezoelectric materials, rotary actuator, stick-slip principle

DOI: 10.3233/JAE-171159

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2019

Authors: Kida, Masahiro | Oda, Yoshiho | Suzuki, Toshiki | Narita, Takayoshi | Kato, Hideaki | Moriyama, Hiroyuki

Article Type: Research Article

Abstract: Thin steel plates are widely used in various industrial products. However, deterioration of their surface quality and metal plating occur to movement. As a solution to these problems, non-contact transportation of a steel plate using electromagnetic force has been proposed. In this study, a thin steel plate (0.24 mm thickness) was magnetically levitated, and we carried out experiments using the one-degree of freedom model and continuous model for levitation control to determine the effect of a magnetic field from the horizontal direction applied to the levitated steel plate on its elastic vibration.

Keywords: Electromagnetic levitation control, thin steel plate, magnetic field, transportation

DOI: 10.3233/JAE-171147

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2019

Authors: Qian, Junbing | Bao, Liping | Ji, Chuankun | Wu, Jing

Article Type: Research Article

Abstract: A permanent magnet synchronous linear motor (PMSLM) is a linear drive mechanism that converts electric energy into mechanical energy. PMLSMs have been deployed widely in modern precision industrial manufacturing. In this study, an air-gap magnetic field model of a rectangular permanent magnet array in a PMSLM is developed based on the Biol-Savart theorem and the molecular circulation model. Furthermore, an analytical expression for the magnetic field distribution of the air-gap space is derived. Ansoft and experimental measurement are used to model the PMSLM and calculate the magnetic induction intensity and validate the analytical model. The relation between the air-gap magnetic field …of a PMSLM and the geometrical dimension of the permanent magnet is analyzed. Show more

Keywords: Permanent magnet synchronous linear motor, permanent magnet, magnetic field analysis, air gap, magnetic induction intensity

DOI: 10.3233/JAE-170162

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-13, 2018

Authors: Takei, Amane | Mizuma, Takeihito | Akatsuka, Motoki | Yamada, Tomonori

Article Type: Research Article

Abstract: This paper describes a method for evaluating the performance of electrical insulators exposed to winter environments using a large-scale numerical electrostatic analysis. Generally speaking, it is acknowledged that the presence of saltwater or accreted saline ice will degrade the ability of insulators to prevent electrical conduction. In our study, we began by confirming the insulation efficiency of insulators by conducting 50% impulse flashover voltage tests. Next, in order to study the performance of our evaluation method, the insulators were modeled via a parallel electrostatic analysis based on the hierarchical domain decomposition method. The mechanism for the deterioration of the insulation …performance was clarified with the proposed method. Show more

Keywords: Electrostatic analysis, ice accreted insulators, insulation performance evaluation, adventure system

DOI: 10.3233/JAE-170168

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-20, 2018

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. Pre-press, no. Pre-press, pp. 1-24, 2018

Authors: Ma, Xiaoping | Su, Sanqing | Wang, Wei | Yang, Yiyi | Yi, Shuchun | Zhao, Xuran

Article Type: Research Article

Abstract: Torsion tests on 50 Mn steel wire were implemented and illustrated in this research to probe into the relationship between normal components of self-magnetic-flux-leakage (SMFL) signals H p (y ) and early damage of steel wire subjected to torsional stress. Besides, a modified model with due consideration of coercivity and permeability varying with equivalent stress at elastic-plastic stage was presented to simulate H p (y ) signals of steel wire under torsion accurately. Relevant numerical simulations of magneto-mechanical coupling were performed. The results show that using zero crossing point (ZCP) of H p (y ) signals to …identify defect location does not apply to steel wire under torsion. However, there is crest (or trough) showing on magnetic signal curve prior to fracture. By utilizing location of crest (or trough), damage could be positioned accurately and ultimate fracture point could be forecasted in advance as well. Furthermore, simulation results obtained from the modified model are consistent with test results. Not only can study results demonstrate that MMM technique could be used for determining early damage of steel wire under torsion, but also provide certain reference for quantitative analysis about the relationship between damage and H p (y ) signals. Show more

Keywords: Steel wire, torsion, magnetic memory method, damage location, magneto-mechanical coupling

DOI: 10.3233/JAE-180075

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-24, 2018

Authors: Zhang, Guangwei | Yamamoto, Akio

Article Type: Research Article

Abstract: This work proposes a self-sensing method for a synchronous electrostatic film motor. The method utilizes the relation between the driving voltages and currents of the motor. Through several signal conversions on the measured motor currents, the system distills the information of the slider position to realize displacement sensing. The resulting system can track the slider position both for synchronous and non-synchronous operations. The system assumes stepwise motions of the slider and fully exploits the characteristic current features of the motions. Two different signal conversion methods have been tested using numerically simulated motor currents and real motor currents. The two methods …differ in terms of accuracy and noise immunity. Considering that the currents of the electrostatic motor are relatively small, the method with high noise immunity and relatively low accuracy was found useful for practical applications. The position resolution achieved by the method was in the order of the electrode pitch, which is 200 μm in the prototype motor used in this work. Show more

Keywords: Electrostatic film motor, displacement estimation, sensorless

DOI: 10.3233/JAE-180068

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-15, 2018